Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(c) 2007 Intel Corporation. All rights reserved. |
| 3 | * Copyright(c) 2008 Red Hat, Inc. All rights reserved. |
| 4 | * Copyright(c) 2008 Mike Christie |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along with |
| 16 | * this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Maintained at www.Open-FCoE.org |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * Fibre Channel exchange and sequence handling. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/timer.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 28 | #include <linux/err.h> |
Paul Gortmaker | 0970366 | 2011-05-27 09:37:25 -0400 | [diff] [blame] | 29 | #include <linux/export.h> |
Bart Van Assche | a84ea8c | 2013-08-14 15:33:35 +0000 | [diff] [blame] | 30 | #include <linux/log2.h> |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 31 | |
| 32 | #include <scsi/fc/fc_fc2.h> |
| 33 | |
| 34 | #include <scsi/libfc.h> |
| 35 | #include <scsi/fc_encode.h> |
| 36 | |
Robert Love | 8866a5d | 2009-11-03 11:45:58 -0800 | [diff] [blame] | 37 | #include "fc_libfc.h" |
| 38 | |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 39 | u16 fc_cpu_mask; /* cpu mask for possible cpus */ |
| 40 | EXPORT_SYMBOL(fc_cpu_mask); |
| 41 | static u16 fc_cpu_order; /* 2's power to represent total possible cpus */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 42 | static struct kmem_cache *fc_em_cachep; /* cache for exchanges */ |
Randy Dunlap | 5520490 | 2011-01-28 16:03:57 -0800 | [diff] [blame] | 43 | static struct workqueue_struct *fc_exch_workqueue; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * Structure and function definitions for managing Fibre Channel Exchanges |
| 47 | * and Sequences. |
| 48 | * |
| 49 | * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq. |
| 50 | * |
| 51 | * fc_exch_mgr holds the exchange state for an N port |
| 52 | * |
| 53 | * fc_exch holds state for one exchange and links to its active sequence. |
| 54 | * |
| 55 | * fc_seq holds the state for an individual sequence. |
| 56 | */ |
| 57 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 58 | /** |
| 59 | * struct fc_exch_pool - Per cpu exchange pool |
| 60 | * @next_index: Next possible free exchange index |
| 61 | * @total_exches: Total allocated exchanges |
| 62 | * @lock: Exch pool lock |
| 63 | * @ex_list: List of exchanges |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 64 | * |
| 65 | * This structure manages per cpu exchanges in array of exchange pointers. |
| 66 | * This array is allocated followed by struct fc_exch_pool memory for |
| 67 | * assigned range of exchanges to per cpu pool. |
| 68 | */ |
| 69 | struct fc_exch_pool { |
Vasu Dev | e17b4af | 2011-09-27 21:38:08 -0700 | [diff] [blame] | 70 | spinlock_t lock; |
| 71 | struct list_head ex_list; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 72 | u16 next_index; |
| 73 | u16 total_exches; |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 74 | |
| 75 | /* two cache of free slot in exch array */ |
| 76 | u16 left; |
| 77 | u16 right; |
Vasu Dev | e17b4af | 2011-09-27 21:38:08 -0700 | [diff] [blame] | 78 | } ____cacheline_aligned_in_smp; |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 79 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 80 | /** |
| 81 | * struct fc_exch_mgr - The Exchange Manager (EM). |
| 82 | * @class: Default class for new sequences |
| 83 | * @kref: Reference counter |
| 84 | * @min_xid: Minimum exchange ID |
| 85 | * @max_xid: Maximum exchange ID |
| 86 | * @ep_pool: Reserved exchange pointers |
| 87 | * @pool_max_index: Max exch array index in exch pool |
| 88 | * @pool: Per cpu exch pool |
| 89 | * @stats: Statistics structure |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 90 | * |
| 91 | * This structure is the center for creating exchanges and sequences. |
| 92 | * It manages the allocation of exchange IDs. |
| 93 | */ |
| 94 | struct fc_exch_mgr { |
Bart Van Assche | c6b21c9 | 2012-01-13 17:26:20 -0800 | [diff] [blame] | 95 | struct fc_exch_pool __percpu *pool; |
Vasu Dev | e17b4af | 2011-09-27 21:38:08 -0700 | [diff] [blame] | 96 | mempool_t *ep_pool; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 97 | enum fc_class class; |
| 98 | struct kref kref; |
| 99 | u16 min_xid; |
| 100 | u16 max_xid; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 101 | u16 pool_max_index; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 102 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 103 | struct { |
| 104 | atomic_t no_free_exch; |
| 105 | atomic_t no_free_exch_xid; |
| 106 | atomic_t xid_not_found; |
| 107 | atomic_t xid_busy; |
| 108 | atomic_t seq_not_found; |
| 109 | atomic_t non_bls_resp; |
| 110 | } stats; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 111 | }; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 112 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 113 | /** |
| 114 | * struct fc_exch_mgr_anchor - primary structure for list of EMs |
| 115 | * @ema_list: Exchange Manager Anchor list |
| 116 | * @mp: Exchange Manager associated with this anchor |
| 117 | * @match: Routine to determine if this anchor's EM should be used |
| 118 | * |
| 119 | * When walking the list of anchors the match routine will be called |
| 120 | * for each anchor to determine if that EM should be used. The last |
| 121 | * anchor in the list will always match to handle any exchanges not |
| 122 | * handled by other EMs. The non-default EMs would be added to the |
Vasu Dev | 1bd49b4 | 2012-05-25 10:26:43 -0700 | [diff] [blame] | 123 | * anchor list by HW that provides offloads. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 124 | */ |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 125 | struct fc_exch_mgr_anchor { |
| 126 | struct list_head ema_list; |
| 127 | struct fc_exch_mgr *mp; |
| 128 | bool (*match)(struct fc_frame *); |
| 129 | }; |
| 130 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 131 | static void fc_exch_rrq(struct fc_exch *); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 132 | static void fc_seq_ls_acc(struct fc_frame *); |
| 133 | static void fc_seq_ls_rjt(struct fc_frame *, enum fc_els_rjt_reason, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 134 | enum fc_els_rjt_explan); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 135 | static void fc_exch_els_rec(struct fc_frame *); |
| 136 | static void fc_exch_els_rrq(struct fc_frame *); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 137 | |
| 138 | /* |
| 139 | * Internal implementation notes. |
| 140 | * |
| 141 | * The exchange manager is one by default in libfc but LLD may choose |
| 142 | * to have one per CPU. The sequence manager is one per exchange manager |
| 143 | * and currently never separated. |
| 144 | * |
| 145 | * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field |
| 146 | * assigned by the Sequence Initiator that shall be unique for a specific |
| 147 | * D_ID and S_ID pair while the Sequence is open." Note that it isn't |
| 148 | * qualified by exchange ID, which one might think it would be. |
| 149 | * In practice this limits the number of open sequences and exchanges to 256 |
| 150 | * per session. For most targets we could treat this limit as per exchange. |
| 151 | * |
| 152 | * The exchange and its sequence are freed when the last sequence is received. |
| 153 | * It's possible for the remote port to leave an exchange open without |
| 154 | * sending any sequences. |
| 155 | * |
| 156 | * Notes on reference counts: |
| 157 | * |
| 158 | * Exchanges are reference counted and exchange gets freed when the reference |
| 159 | * count becomes zero. |
| 160 | * |
| 161 | * Timeouts: |
| 162 | * Sequences are timed out for E_D_TOV and R_A_TOV. |
| 163 | * |
| 164 | * Sequence event handling: |
| 165 | * |
| 166 | * The following events may occur on initiator sequences: |
| 167 | * |
| 168 | * Send. |
| 169 | * For now, the whole thing is sent. |
| 170 | * Receive ACK |
| 171 | * This applies only to class F. |
| 172 | * The sequence is marked complete. |
| 173 | * ULP completion. |
| 174 | * The upper layer calls fc_exch_done() when done |
| 175 | * with exchange and sequence tuple. |
| 176 | * RX-inferred completion. |
| 177 | * When we receive the next sequence on the same exchange, we can |
| 178 | * retire the previous sequence ID. (XXX not implemented). |
| 179 | * Timeout. |
| 180 | * R_A_TOV frees the sequence ID. If we're waiting for ACK, |
| 181 | * E_D_TOV causes abort and calls upper layer response handler |
| 182 | * with FC_EX_TIMEOUT error. |
| 183 | * Receive RJT |
| 184 | * XXX defer. |
| 185 | * Send ABTS |
| 186 | * On timeout. |
| 187 | * |
| 188 | * The following events may occur on recipient sequences: |
| 189 | * |
| 190 | * Receive |
| 191 | * Allocate sequence for first frame received. |
| 192 | * Hold during receive handler. |
| 193 | * Release when final frame received. |
| 194 | * Keep status of last N of these for the ELS RES command. XXX TBD. |
| 195 | * Receive ABTS |
| 196 | * Deallocate sequence |
| 197 | * Send RJT |
| 198 | * Deallocate |
| 199 | * |
| 200 | * For now, we neglect conditions where only part of a sequence was |
| 201 | * received or transmitted, or where out-of-order receipt is detected. |
| 202 | */ |
| 203 | |
| 204 | /* |
| 205 | * Locking notes: |
| 206 | * |
| 207 | * The EM code run in a per-CPU worker thread. |
| 208 | * |
| 209 | * To protect against concurrency between a worker thread code and timers, |
| 210 | * sequence allocation and deallocation must be locked. |
| 211 | * - exchange refcnt can be done atomicly without locks. |
| 212 | * - sequence allocation must be locked by exch lock. |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 213 | * - If the EM pool lock and ex_lock must be taken at the same time, then the |
| 214 | * EM pool lock must be taken before the ex_lock. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 215 | */ |
| 216 | |
| 217 | /* |
| 218 | * opcode names for debugging. |
| 219 | */ |
| 220 | static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT; |
| 221 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 222 | /** |
| 223 | * fc_exch_name_lookup() - Lookup name by opcode |
| 224 | * @op: Opcode to be looked up |
| 225 | * @table: Opcode/name table |
| 226 | * @max_index: Index not to be exceeded |
| 227 | * |
| 228 | * This routine is used to determine a human-readable string identifying |
| 229 | * a R_CTL opcode. |
| 230 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 231 | static inline const char *fc_exch_name_lookup(unsigned int op, char **table, |
| 232 | unsigned int max_index) |
| 233 | { |
| 234 | const char *name = NULL; |
| 235 | |
| 236 | if (op < max_index) |
| 237 | name = table[op]; |
| 238 | if (!name) |
| 239 | name = "unknown"; |
| 240 | return name; |
| 241 | } |
| 242 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 243 | /** |
| 244 | * fc_exch_rctl_name() - Wrapper routine for fc_exch_name_lookup() |
| 245 | * @op: The opcode to be looked up |
| 246 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 247 | static const char *fc_exch_rctl_name(unsigned int op) |
| 248 | { |
| 249 | return fc_exch_name_lookup(op, fc_exch_rctl_names, |
Kulikov Vasiliy | 7156fff | 2010-06-28 15:55:12 +0400 | [diff] [blame] | 250 | ARRAY_SIZE(fc_exch_rctl_names)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 251 | } |
| 252 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 253 | /** |
| 254 | * fc_exch_hold() - Increment an exchange's reference count |
| 255 | * @ep: Echange to be held |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 256 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 257 | static inline void fc_exch_hold(struct fc_exch *ep) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 258 | { |
| 259 | atomic_inc(&ep->ex_refcnt); |
| 260 | } |
| 261 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 262 | /** |
| 263 | * fc_exch_setup_hdr() - Initialize a FC header by initializing some fields |
| 264 | * and determine SOF and EOF. |
| 265 | * @ep: The exchange to that will use the header |
| 266 | * @fp: The frame whose header is to be modified |
| 267 | * @f_ctl: F_CTL bits that will be used for the frame header |
| 268 | * |
| 269 | * The fields initialized by this routine are: fh_ox_id, fh_rx_id, |
| 270 | * fh_seq_id, fh_seq_cnt and the SOF and EOF. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 271 | */ |
| 272 | static void fc_exch_setup_hdr(struct fc_exch *ep, struct fc_frame *fp, |
| 273 | u32 f_ctl) |
| 274 | { |
| 275 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 276 | u16 fill; |
| 277 | |
| 278 | fr_sof(fp) = ep->class; |
| 279 | if (ep->seq.cnt) |
| 280 | fr_sof(fp) = fc_sof_normal(ep->class); |
| 281 | |
| 282 | if (f_ctl & FC_FC_END_SEQ) { |
| 283 | fr_eof(fp) = FC_EOF_T; |
| 284 | if (fc_sof_needs_ack(ep->class)) |
| 285 | fr_eof(fp) = FC_EOF_N; |
| 286 | /* |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 287 | * From F_CTL. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 288 | * The number of fill bytes to make the length a 4-byte |
| 289 | * multiple is the low order 2-bits of the f_ctl. |
| 290 | * The fill itself will have been cleared by the frame |
| 291 | * allocation. |
| 292 | * After this, the length will be even, as expected by |
| 293 | * the transport. |
| 294 | */ |
| 295 | fill = fr_len(fp) & 3; |
| 296 | if (fill) { |
| 297 | fill = 4 - fill; |
| 298 | /* TODO, this may be a problem with fragmented skb */ |
| 299 | skb_put(fp_skb(fp), fill); |
| 300 | hton24(fh->fh_f_ctl, f_ctl | fill); |
| 301 | } |
| 302 | } else { |
| 303 | WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */ |
| 304 | fr_eof(fp) = FC_EOF_N; |
| 305 | } |
| 306 | |
Bart Van Assche | c1d4542 | 2013-08-14 15:31:52 +0000 | [diff] [blame] | 307 | /* Initialize remaining fh fields from fc_fill_fc_hdr */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 308 | fh->fh_ox_id = htons(ep->oxid); |
| 309 | fh->fh_rx_id = htons(ep->rxid); |
| 310 | fh->fh_seq_id = ep->seq.id; |
| 311 | fh->fh_seq_cnt = htons(ep->seq.cnt); |
| 312 | } |
| 313 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 314 | /** |
| 315 | * fc_exch_release() - Decrement an exchange's reference count |
| 316 | * @ep: Exchange to be released |
| 317 | * |
| 318 | * If the reference count reaches zero and the exchange is complete, |
| 319 | * it is freed. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 320 | */ |
| 321 | static void fc_exch_release(struct fc_exch *ep) |
| 322 | { |
| 323 | struct fc_exch_mgr *mp; |
| 324 | |
| 325 | if (atomic_dec_and_test(&ep->ex_refcnt)) { |
| 326 | mp = ep->em; |
| 327 | if (ep->destructor) |
| 328 | ep->destructor(&ep->seq, ep->arg); |
Julia Lawall | aa6cd29 | 2009-02-04 22:17:29 +0100 | [diff] [blame] | 329 | WARN_ON(!(ep->esb_stat & ESB_ST_COMPLETE)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 330 | mempool_free(ep, mp->ep_pool); |
| 331 | } |
| 332 | } |
| 333 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 334 | /** |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 335 | * fc_exch_timer_cancel() - cancel exch timer |
| 336 | * @ep: The exchange whose timer to be canceled |
| 337 | */ |
Robert Love | 4a80f08 | 2013-06-11 07:28:03 +0000 | [diff] [blame] | 338 | static inline void fc_exch_timer_cancel(struct fc_exch *ep) |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 339 | { |
| 340 | if (cancel_delayed_work(&ep->timeout_work)) { |
| 341 | FC_EXCH_DBG(ep, "Exchange timer canceled\n"); |
| 342 | atomic_dec(&ep->ex_refcnt); /* drop hold for timer */ |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * fc_exch_timer_set_locked() - Start a timer for an exchange w/ the |
| 348 | * the exchange lock held |
| 349 | * @ep: The exchange whose timer will start |
| 350 | * @timer_msec: The timeout period |
| 351 | * |
| 352 | * Used for upper level protocols to time out the exchange. |
| 353 | * The timer is cancelled when it fires or when the exchange completes. |
| 354 | */ |
| 355 | static inline void fc_exch_timer_set_locked(struct fc_exch *ep, |
| 356 | unsigned int timer_msec) |
| 357 | { |
| 358 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) |
| 359 | return; |
| 360 | |
| 361 | FC_EXCH_DBG(ep, "Exchange timer armed : %d msecs\n", timer_msec); |
| 362 | |
Bart Van Assche | b867886 | 2013-08-14 15:35:29 +0000 | [diff] [blame] | 363 | fc_exch_hold(ep); /* hold for timer */ |
| 364 | if (!queue_delayed_work(fc_exch_workqueue, &ep->timeout_work, |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 365 | msecs_to_jiffies(timer_msec))) { |
| 366 | FC_EXCH_DBG(ep, "Exchange already queued\n"); |
Bart Van Assche | b867886 | 2013-08-14 15:35:29 +0000 | [diff] [blame] | 367 | fc_exch_release(ep); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 368 | } |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | /** |
| 372 | * fc_exch_timer_set() - Lock the exchange and set the timer |
| 373 | * @ep: The exchange whose timer will start |
| 374 | * @timer_msec: The timeout period |
| 375 | */ |
| 376 | static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec) |
| 377 | { |
| 378 | spin_lock_bh(&ep->ex_lock); |
| 379 | fc_exch_timer_set_locked(ep, timer_msec); |
| 380 | spin_unlock_bh(&ep->ex_lock); |
| 381 | } |
| 382 | |
| 383 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 384 | * fc_exch_done_locked() - Complete an exchange with the exchange lock held |
| 385 | * @ep: The exchange that is complete |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 386 | * |
| 387 | * Note: May sleep if invoked from outside a response handler. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 388 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 389 | static int fc_exch_done_locked(struct fc_exch *ep) |
| 390 | { |
| 391 | int rc = 1; |
| 392 | |
| 393 | /* |
| 394 | * We must check for completion in case there are two threads |
| 395 | * tyring to complete this. But the rrq code will reuse the |
| 396 | * ep, and in that case we only clear the resp and set it as |
| 397 | * complete, so it can be reused by the timer to send the rrq. |
| 398 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 399 | if (ep->state & FC_EX_DONE) |
| 400 | return rc; |
| 401 | ep->esb_stat |= ESB_ST_COMPLETE; |
| 402 | |
| 403 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { |
| 404 | ep->state |= FC_EX_DONE; |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 405 | fc_exch_timer_cancel(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 406 | rc = 0; |
| 407 | } |
| 408 | return rc; |
| 409 | } |
| 410 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 411 | /** |
| 412 | * fc_exch_ptr_get() - Return an exchange from an exchange pool |
| 413 | * @pool: Exchange Pool to get an exchange from |
| 414 | * @index: Index of the exchange within the pool |
| 415 | * |
| 416 | * Use the index to get an exchange from within an exchange pool. exches |
| 417 | * will point to an array of exchange pointers. The index will select |
| 418 | * the exchange within the array. |
| 419 | */ |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 420 | static inline struct fc_exch *fc_exch_ptr_get(struct fc_exch_pool *pool, |
| 421 | u16 index) |
| 422 | { |
| 423 | struct fc_exch **exches = (struct fc_exch **)(pool + 1); |
| 424 | return exches[index]; |
| 425 | } |
| 426 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 427 | /** |
| 428 | * fc_exch_ptr_set() - Assign an exchange to a slot in an exchange pool |
| 429 | * @pool: The pool to assign the exchange to |
| 430 | * @index: The index in the pool where the exchange will be assigned |
| 431 | * @ep: The exchange to assign to the pool |
| 432 | */ |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 433 | static inline void fc_exch_ptr_set(struct fc_exch_pool *pool, u16 index, |
| 434 | struct fc_exch *ep) |
| 435 | { |
| 436 | ((struct fc_exch **)(pool + 1))[index] = ep; |
| 437 | } |
| 438 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 439 | /** |
| 440 | * fc_exch_delete() - Delete an exchange |
| 441 | * @ep: The exchange to be deleted |
| 442 | */ |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 443 | static void fc_exch_delete(struct fc_exch *ep) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 444 | { |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 445 | struct fc_exch_pool *pool; |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 446 | u16 index; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 447 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 448 | pool = ep->pool; |
| 449 | spin_lock_bh(&pool->lock); |
| 450 | WARN_ON(pool->total_exches <= 0); |
| 451 | pool->total_exches--; |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 452 | |
| 453 | /* update cache of free slot */ |
| 454 | index = (ep->xid - ep->em->min_xid) >> fc_cpu_order; |
| 455 | if (pool->left == FC_XID_UNKNOWN) |
| 456 | pool->left = index; |
| 457 | else if (pool->right == FC_XID_UNKNOWN) |
| 458 | pool->right = index; |
| 459 | else |
| 460 | pool->next_index = index; |
| 461 | |
| 462 | fc_exch_ptr_set(pool, index, NULL); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 463 | list_del(&ep->ex_list); |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 464 | spin_unlock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 465 | fc_exch_release(ep); /* drop hold for exch in mp */ |
| 466 | } |
| 467 | |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 468 | static int fc_seq_send_locked(struct fc_lport *lport, struct fc_seq *sp, |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 469 | struct fc_frame *fp) |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 470 | { |
| 471 | struct fc_exch *ep; |
| 472 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 473 | int error = -ENXIO; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 474 | u32 f_ctl; |
Vasu Dev | 14fc315 | 2011-10-28 11:34:12 -0700 | [diff] [blame] | 475 | u8 fh_type = fh->fh_type; |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 476 | |
| 477 | ep = fc_seq_exch(sp); |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 478 | |
| 479 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL)) { |
| 480 | fc_frame_free(fp); |
| 481 | goto out; |
| 482 | } |
| 483 | |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 484 | WARN_ON(!(ep->esb_stat & ESB_ST_SEQ_INIT)); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 485 | |
| 486 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 487 | fc_exch_setup_hdr(ep, fp, f_ctl); |
Joe Eykholt | f60e12e | 2010-07-20 15:20:14 -0700 | [diff] [blame] | 488 | fr_encaps(fp) = ep->encaps; |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 489 | |
| 490 | /* |
| 491 | * update sequence count if this frame is carrying |
| 492 | * multiple FC frames when sequence offload is enabled |
| 493 | * by LLD. |
| 494 | */ |
| 495 | if (fr_max_payload(fp)) |
| 496 | sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)), |
| 497 | fr_max_payload(fp)); |
| 498 | else |
| 499 | sp->cnt++; |
| 500 | |
| 501 | /* |
| 502 | * Send the frame. |
| 503 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 504 | error = lport->tt.frame_send(lport, fp); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 505 | |
Vasu Dev | 14fc315 | 2011-10-28 11:34:12 -0700 | [diff] [blame] | 506 | if (fh_type == FC_TYPE_BLS) |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 507 | goto out; |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 508 | |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 509 | /* |
| 510 | * Update the exchange and sequence flags, |
| 511 | * assuming all frames for the sequence have been sent. |
| 512 | * We can only be called to send once for each sequence. |
| 513 | */ |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 514 | ep->f_ctl = f_ctl & ~FC_FC_FIRST_SEQ; /* not first seq */ |
Joe Eykholt | cc3593d | 2010-03-12 16:08:29 -0800 | [diff] [blame] | 515 | if (f_ctl & FC_FC_SEQ_INIT) |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 516 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 517 | out: |
| 518 | return error; |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * fc_seq_send() - Send a frame using existing sequence/exchange pair |
| 523 | * @lport: The local port that the exchange will be sent on |
| 524 | * @sp: The sequence to be sent |
| 525 | * @fp: The frame to be sent on the exchange |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 526 | * |
| 527 | * Note: The frame will be freed either by a direct call to fc_frame_free(fp) |
| 528 | * or indirectly by calling libfc_function_template.frame_send(). |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 529 | */ |
| 530 | static int fc_seq_send(struct fc_lport *lport, struct fc_seq *sp, |
| 531 | struct fc_frame *fp) |
| 532 | { |
| 533 | struct fc_exch *ep; |
| 534 | int error; |
| 535 | ep = fc_seq_exch(sp); |
| 536 | spin_lock_bh(&ep->ex_lock); |
| 537 | error = fc_seq_send_locked(lport, sp, fp); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 538 | spin_unlock_bh(&ep->ex_lock); |
| 539 | return error; |
| 540 | } |
| 541 | |
| 542 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 543 | * fc_seq_alloc() - Allocate a sequence for a given exchange |
| 544 | * @ep: The exchange to allocate a new sequence for |
| 545 | * @seq_id: The sequence ID to be used |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 546 | * |
| 547 | * We don't support multiple originated sequences on the same exchange. |
| 548 | * By implication, any previously originated sequence on this exchange |
| 549 | * is complete, and we reallocate the same sequence. |
| 550 | */ |
| 551 | static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id) |
| 552 | { |
| 553 | struct fc_seq *sp; |
| 554 | |
| 555 | sp = &ep->seq; |
| 556 | sp->ssb_stat = 0; |
| 557 | sp->cnt = 0; |
| 558 | sp->id = seq_id; |
| 559 | return sp; |
| 560 | } |
| 561 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 562 | /** |
| 563 | * fc_seq_start_next_locked() - Allocate a new sequence on the same |
| 564 | * exchange as the supplied sequence |
| 565 | * @sp: The sequence/exchange to get a new sequence for |
| 566 | */ |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 567 | static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp) |
| 568 | { |
| 569 | struct fc_exch *ep = fc_seq_exch(sp); |
| 570 | |
| 571 | sp = fc_seq_alloc(ep, ep->seq_id++); |
| 572 | FC_EXCH_DBG(ep, "f_ctl %6x seq %2x\n", |
| 573 | ep->f_ctl, sp->id); |
| 574 | return sp; |
| 575 | } |
| 576 | |
| 577 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 578 | * fc_seq_start_next() - Lock the exchange and get a new sequence |
| 579 | * for a given sequence/exchange pair |
| 580 | * @sp: The sequence/exchange to get a new exchange for |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 581 | */ |
| 582 | static struct fc_seq *fc_seq_start_next(struct fc_seq *sp) |
| 583 | { |
| 584 | struct fc_exch *ep = fc_seq_exch(sp); |
| 585 | |
| 586 | spin_lock_bh(&ep->ex_lock); |
| 587 | sp = fc_seq_start_next_locked(sp); |
| 588 | spin_unlock_bh(&ep->ex_lock); |
| 589 | |
| 590 | return sp; |
| 591 | } |
| 592 | |
Joe Eykholt | 1a5c2d7 | 2011-01-28 16:04:08 -0800 | [diff] [blame] | 593 | /* |
| 594 | * Set the response handler for the exchange associated with a sequence. |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 595 | * |
| 596 | * Note: May sleep if invoked from outside a response handler. |
Joe Eykholt | 1a5c2d7 | 2011-01-28 16:04:08 -0800 | [diff] [blame] | 597 | */ |
| 598 | static void fc_seq_set_resp(struct fc_seq *sp, |
| 599 | void (*resp)(struct fc_seq *, struct fc_frame *, |
| 600 | void *), |
| 601 | void *arg) |
| 602 | { |
| 603 | struct fc_exch *ep = fc_seq_exch(sp); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 604 | DEFINE_WAIT(wait); |
Joe Eykholt | 1a5c2d7 | 2011-01-28 16:04:08 -0800 | [diff] [blame] | 605 | |
| 606 | spin_lock_bh(&ep->ex_lock); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 607 | while (ep->resp_active && ep->resp_task != current) { |
| 608 | prepare_to_wait(&ep->resp_wq, &wait, TASK_UNINTERRUPTIBLE); |
| 609 | spin_unlock_bh(&ep->ex_lock); |
| 610 | |
| 611 | schedule(); |
| 612 | |
| 613 | spin_lock_bh(&ep->ex_lock); |
| 614 | } |
| 615 | finish_wait(&ep->resp_wq, &wait); |
Joe Eykholt | 1a5c2d7 | 2011-01-28 16:04:08 -0800 | [diff] [blame] | 616 | ep->resp = resp; |
| 617 | ep->arg = arg; |
| 618 | spin_unlock_bh(&ep->ex_lock); |
| 619 | } |
| 620 | |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 621 | /** |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 622 | * fc_exch_abort_locked() - Abort an exchange |
| 623 | * @ep: The exchange to be aborted |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 624 | * @timer_msec: The period of time to wait before aborting |
| 625 | * |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 626 | * Locking notes: Called with exch lock held |
| 627 | * |
| 628 | * Return value: 0 on success else error code |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 629 | */ |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 630 | static int fc_exch_abort_locked(struct fc_exch *ep, |
| 631 | unsigned int timer_msec) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 632 | { |
| 633 | struct fc_seq *sp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 634 | struct fc_frame *fp; |
| 635 | int error; |
| 636 | |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 637 | FC_EXCH_DBG(ep, "exch: abort, time %d msecs\n", timer_msec); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 638 | if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) || |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 639 | ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) { |
| 640 | FC_EXCH_DBG(ep, "exch: already completed esb %x state %x\n", |
| 641 | ep->esb_stat, ep->state); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 642 | return -ENXIO; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 643 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 644 | |
| 645 | /* |
| 646 | * Send the abort on a new sequence if possible. |
| 647 | */ |
| 648 | sp = fc_seq_start_next_locked(&ep->seq); |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 649 | if (!sp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 650 | return -ENOMEM; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 651 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 652 | if (timer_msec) |
| 653 | fc_exch_timer_set_locked(ep, timer_msec); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 654 | |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 655 | if (ep->sid) { |
| 656 | /* |
| 657 | * Send an abort for the sequence that timed out. |
| 658 | */ |
| 659 | fp = fc_frame_alloc(ep->lp, 0); |
| 660 | if (fp) { |
| 661 | ep->esb_stat |= ESB_ST_SEQ_INIT; |
| 662 | fc_fill_fc_hdr(fp, FC_RCTL_BA_ABTS, ep->did, ep->sid, |
| 663 | FC_TYPE_BLS, FC_FC_END_SEQ | |
| 664 | FC_FC_SEQ_INIT, 0); |
| 665 | error = fc_seq_send_locked(ep->lp, sp, fp); |
| 666 | } else { |
| 667 | error = -ENOBUFS; |
| 668 | } |
| 669 | } else { |
| 670 | /* |
| 671 | * If not logged into the fabric, don't send ABTS but leave |
| 672 | * sequence active until next timeout. |
| 673 | */ |
| 674 | error = 0; |
| 675 | } |
| 676 | ep->esb_stat |= ESB_ST_ABNORMAL; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 677 | return error; |
| 678 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 679 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 680 | /** |
Vasu Dev | 77a2b73 | 2011-08-25 12:40:52 -0700 | [diff] [blame] | 681 | * fc_seq_exch_abort() - Abort an exchange and sequence |
| 682 | * @req_sp: The sequence to be aborted |
| 683 | * @timer_msec: The period of time to wait before aborting |
| 684 | * |
| 685 | * Generally called because of a timeout or an abort from the upper layer. |
| 686 | * |
| 687 | * Return value: 0 on success else error code |
| 688 | */ |
| 689 | static int fc_seq_exch_abort(const struct fc_seq *req_sp, |
| 690 | unsigned int timer_msec) |
| 691 | { |
| 692 | struct fc_exch *ep; |
| 693 | int error; |
| 694 | |
| 695 | ep = fc_seq_exch(req_sp); |
| 696 | spin_lock_bh(&ep->ex_lock); |
| 697 | error = fc_exch_abort_locked(ep, timer_msec); |
| 698 | spin_unlock_bh(&ep->ex_lock); |
| 699 | return error; |
| 700 | } |
| 701 | |
| 702 | /** |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 703 | * fc_invoke_resp() - invoke ep->resp() |
| 704 | * |
| 705 | * Notes: |
| 706 | * It is assumed that after initialization finished (this means the |
| 707 | * first unlock of ex_lock after fc_exch_alloc()) ep->resp and ep->arg are |
| 708 | * modified only via fc_seq_set_resp(). This guarantees that none of these |
| 709 | * two variables changes if ep->resp_active > 0. |
| 710 | * |
| 711 | * If an fc_seq_set_resp() call is busy modifying ep->resp and ep->arg when |
| 712 | * this function is invoked, the first spin_lock_bh() call in this function |
| 713 | * will wait until fc_seq_set_resp() has finished modifying these variables. |
| 714 | * |
| 715 | * Since fc_exch_done() invokes fc_seq_set_resp() it is guaranteed that that |
| 716 | * ep->resp() won't be invoked after fc_exch_done() has returned. |
| 717 | * |
| 718 | * The response handler itself may invoke fc_exch_done(), which will clear the |
| 719 | * ep->resp pointer. |
| 720 | * |
| 721 | * Return value: |
| 722 | * Returns true if and only if ep->resp has been invoked. |
| 723 | */ |
| 724 | static bool fc_invoke_resp(struct fc_exch *ep, struct fc_seq *sp, |
| 725 | struct fc_frame *fp) |
| 726 | { |
| 727 | void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg); |
| 728 | void *arg; |
| 729 | bool res = false; |
| 730 | |
| 731 | spin_lock_bh(&ep->ex_lock); |
| 732 | ep->resp_active++; |
| 733 | if (ep->resp_task != current) |
| 734 | ep->resp_task = !ep->resp_task ? current : NULL; |
| 735 | resp = ep->resp; |
| 736 | arg = ep->arg; |
| 737 | spin_unlock_bh(&ep->ex_lock); |
| 738 | |
| 739 | if (resp) { |
| 740 | resp(sp, fp, arg); |
| 741 | res = true; |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | spin_lock_bh(&ep->ex_lock); |
| 745 | if (--ep->resp_active == 0) |
| 746 | ep->resp_task = NULL; |
| 747 | spin_unlock_bh(&ep->ex_lock); |
| 748 | |
| 749 | if (ep->resp_active == 0) |
| 750 | wake_up(&ep->resp_wq); |
| 751 | |
| 752 | return res; |
| 753 | } |
| 754 | |
| 755 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 756 | * fc_exch_timeout() - Handle exchange timer expiration |
| 757 | * @work: The work_struct identifying the exchange that timed out |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 758 | */ |
| 759 | static void fc_exch_timeout(struct work_struct *work) |
| 760 | { |
| 761 | struct fc_exch *ep = container_of(work, struct fc_exch, |
| 762 | timeout_work.work); |
| 763 | struct fc_seq *sp = &ep->seq; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 764 | u32 e_stat; |
| 765 | int rc = 1; |
| 766 | |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 767 | FC_EXCH_DBG(ep, "Exchange timed out state %x\n", ep->state); |
Robert Love | cd305ce | 2009-08-25 13:58:37 -0700 | [diff] [blame] | 768 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 769 | spin_lock_bh(&ep->ex_lock); |
| 770 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) |
| 771 | goto unlock; |
| 772 | |
| 773 | e_stat = ep->esb_stat; |
| 774 | if (e_stat & ESB_ST_COMPLETE) { |
| 775 | ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL; |
Vasu Dev | a0cc1ec | 2009-07-28 17:33:37 -0700 | [diff] [blame] | 776 | spin_unlock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 777 | if (e_stat & ESB_ST_REC_QUAL) |
| 778 | fc_exch_rrq(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 779 | goto done; |
| 780 | } else { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 781 | if (e_stat & ESB_ST_ABNORMAL) |
| 782 | rc = fc_exch_done_locked(ep); |
| 783 | spin_unlock_bh(&ep->ex_lock); |
Parikh, Neerav | f316248 | 2011-02-25 15:02:56 -0800 | [diff] [blame] | 784 | if (!rc) |
| 785 | fc_exch_delete(ep); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 786 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_TIMEOUT)); |
| 787 | fc_seq_set_resp(sp, NULL, ep->arg); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 788 | fc_seq_exch_abort(sp, 2 * ep->r_a_tov); |
| 789 | goto done; |
| 790 | } |
| 791 | unlock: |
| 792 | spin_unlock_bh(&ep->ex_lock); |
| 793 | done: |
| 794 | /* |
| 795 | * This release matches the hold taken when the timer was set. |
| 796 | */ |
| 797 | fc_exch_release(ep); |
| 798 | } |
| 799 | |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 800 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 801 | * fc_exch_em_alloc() - Allocate an exchange from a specified EM. |
| 802 | * @lport: The local port that the exchange is for |
| 803 | * @mp: The exchange manager that will allocate the exchange |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 804 | * |
Vasu Dev | d717968 | 2009-07-29 17:05:21 -0700 | [diff] [blame] | 805 | * Returns pointer to allocated fc_exch with exch lock held. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 806 | */ |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 807 | static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport, |
Vasu Dev | d717968 | 2009-07-29 17:05:21 -0700 | [diff] [blame] | 808 | struct fc_exch_mgr *mp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 809 | { |
| 810 | struct fc_exch *ep; |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 811 | unsigned int cpu; |
| 812 | u16 index; |
| 813 | struct fc_exch_pool *pool; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 814 | |
| 815 | /* allocate memory for exchange */ |
| 816 | ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC); |
| 817 | if (!ep) { |
| 818 | atomic_inc(&mp->stats.no_free_exch); |
| 819 | goto out; |
| 820 | } |
| 821 | memset(ep, 0, sizeof(*ep)); |
| 822 | |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 823 | cpu = get_cpu(); |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 824 | pool = per_cpu_ptr(mp->pool, cpu); |
| 825 | spin_lock_bh(&pool->lock); |
Joe Eykholt | f018b73 | 2010-03-12 16:08:55 -0800 | [diff] [blame] | 826 | put_cpu(); |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 827 | |
| 828 | /* peek cache of free slot */ |
| 829 | if (pool->left != FC_XID_UNKNOWN) { |
Hannes Reinecke | b73aa56 | 2016-10-13 15:10:49 +0200 | [diff] [blame^] | 830 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->left))) { |
| 831 | index = pool->left; |
| 832 | pool->left = FC_XID_UNKNOWN; |
| 833 | goto hit; |
| 834 | } |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 835 | } |
| 836 | if (pool->right != FC_XID_UNKNOWN) { |
Hannes Reinecke | b73aa56 | 2016-10-13 15:10:49 +0200 | [diff] [blame^] | 837 | if (!WARN_ON(fc_exch_ptr_get(pool, pool->right))) { |
| 838 | index = pool->right; |
| 839 | pool->right = FC_XID_UNKNOWN; |
| 840 | goto hit; |
| 841 | } |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 842 | } |
| 843 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 844 | index = pool->next_index; |
| 845 | /* allocate new exch from pool */ |
| 846 | while (fc_exch_ptr_get(pool, index)) { |
| 847 | index = index == mp->pool_max_index ? 0 : index + 1; |
| 848 | if (index == pool->next_index) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 849 | goto err; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 850 | } |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 851 | pool->next_index = index == mp->pool_max_index ? 0 : index + 1; |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 852 | hit: |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 853 | fc_exch_hold(ep); /* hold for exch in mp */ |
| 854 | spin_lock_init(&ep->ex_lock); |
| 855 | /* |
| 856 | * Hold exch lock for caller to prevent fc_exch_reset() |
| 857 | * from releasing exch while fc_exch_alloc() caller is |
| 858 | * still working on exch. |
| 859 | */ |
| 860 | spin_lock_bh(&ep->ex_lock); |
| 861 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 862 | fc_exch_ptr_set(pool, index, ep); |
| 863 | list_add_tail(&ep->ex_list, &pool->ex_list); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 864 | fc_seq_alloc(ep, ep->seq_id++); |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 865 | pool->total_exches++; |
| 866 | spin_unlock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 867 | |
| 868 | /* |
| 869 | * update exchange |
| 870 | */ |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 871 | ep->oxid = ep->xid = (index << fc_cpu_order | cpu) + mp->min_xid; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 872 | ep->em = mp; |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 873 | ep->pool = pool; |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 874 | ep->lp = lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 875 | ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */ |
| 876 | ep->rxid = FC_XID_UNKNOWN; |
| 877 | ep->class = mp->class; |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 878 | ep->resp_active = 0; |
| 879 | init_waitqueue_head(&ep->resp_wq); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 880 | INIT_DELAYED_WORK(&ep->timeout_work, fc_exch_timeout); |
| 881 | out: |
| 882 | return ep; |
| 883 | err: |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 884 | spin_unlock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 885 | atomic_inc(&mp->stats.no_free_exch_xid); |
| 886 | mempool_free(ep, mp->ep_pool); |
| 887 | return NULL; |
| 888 | } |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 889 | |
| 890 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 891 | * fc_exch_alloc() - Allocate an exchange from an EM on a |
| 892 | * local port's list of EMs. |
| 893 | * @lport: The local port that will own the exchange |
| 894 | * @fp: The FC frame that the exchange will be for |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 895 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 896 | * This function walks the list of exchange manager(EM) |
| 897 | * anchors to select an EM for a new exchange allocation. The |
| 898 | * EM is selected when a NULL match function pointer is encountered |
| 899 | * or when a call to a match function returns true. |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 900 | */ |
Martin K. Petersen | f8f91f3 | 2016-10-14 16:37:29 -0400 | [diff] [blame] | 901 | static struct fc_exch *fc_exch_alloc(struct fc_lport *lport, |
| 902 | struct fc_frame *fp) |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 903 | { |
| 904 | struct fc_exch_mgr_anchor *ema; |
Martin K. Petersen | f8f91f3 | 2016-10-14 16:37:29 -0400 | [diff] [blame] | 905 | struct fc_exch *ep; |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 906 | |
Martin K. Petersen | f8f91f3 | 2016-10-14 16:37:29 -0400 | [diff] [blame] | 907 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
| 908 | if (!ema->match || ema->match(fp)) { |
| 909 | ep = fc_exch_em_alloc(lport, ema->mp); |
| 910 | if (ep) |
| 911 | return ep; |
| 912 | } |
| 913 | } |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 914 | return NULL; |
| 915 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 916 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 917 | /** |
| 918 | * fc_exch_find() - Lookup and hold an exchange |
| 919 | * @mp: The exchange manager to lookup the exchange from |
| 920 | * @xid: The XID of the exchange to look up |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 921 | */ |
| 922 | static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid) |
| 923 | { |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 924 | struct fc_exch_pool *pool; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 925 | struct fc_exch *ep = NULL; |
Chris Leech | fa06883 | 2016-06-30 08:32:36 -0700 | [diff] [blame] | 926 | u16 cpu = xid & fc_cpu_mask; |
| 927 | |
| 928 | if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) { |
| 929 | printk_ratelimited(KERN_ERR |
| 930 | "libfc: lookup request for XID = %d, " |
| 931 | "indicates invalid CPU %d\n", xid, cpu); |
| 932 | return NULL; |
| 933 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 934 | |
| 935 | if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) { |
Chris Leech | fa06883 | 2016-06-30 08:32:36 -0700 | [diff] [blame] | 936 | pool = per_cpu_ptr(mp->pool, cpu); |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 937 | spin_lock_bh(&pool->lock); |
| 938 | ep = fc_exch_ptr_get(pool, (xid - mp->min_xid) >> fc_cpu_order); |
Bart Van Assche | 8d08023 | 2013-08-17 20:20:07 +0000 | [diff] [blame] | 939 | if (ep) { |
| 940 | WARN_ON(ep->xid != xid); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 941 | fc_exch_hold(ep); |
Bart Van Assche | 8d08023 | 2013-08-17 20:20:07 +0000 | [diff] [blame] | 942 | } |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 943 | spin_unlock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 944 | } |
| 945 | return ep; |
| 946 | } |
| 947 | |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 948 | |
| 949 | /** |
| 950 | * fc_exch_done() - Indicate that an exchange/sequence tuple is complete and |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 951 | * the memory allocated for the related objects may be freed. |
| 952 | * @sp: The sequence that has completed |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 953 | * |
| 954 | * Note: May sleep if invoked from outside a response handler. |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 955 | */ |
| 956 | static void fc_exch_done(struct fc_seq *sp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 957 | { |
| 958 | struct fc_exch *ep = fc_seq_exch(sp); |
| 959 | int rc; |
| 960 | |
| 961 | spin_lock_bh(&ep->ex_lock); |
| 962 | rc = fc_exch_done_locked(ep); |
| 963 | spin_unlock_bh(&ep->ex_lock); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 964 | |
| 965 | fc_seq_set_resp(sp, NULL, ep->arg); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 966 | if (!rc) |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 967 | fc_exch_delete(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 968 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 969 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 970 | /** |
| 971 | * fc_exch_resp() - Allocate a new exchange for a response frame |
| 972 | * @lport: The local port that the exchange was for |
| 973 | * @mp: The exchange manager to allocate the exchange from |
| 974 | * @fp: The response frame |
| 975 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 976 | * Sets the responder ID in the frame header. |
| 977 | */ |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 978 | static struct fc_exch *fc_exch_resp(struct fc_lport *lport, |
| 979 | struct fc_exch_mgr *mp, |
| 980 | struct fc_frame *fp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 981 | { |
| 982 | struct fc_exch *ep; |
| 983 | struct fc_frame_header *fh; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 984 | |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 985 | ep = fc_exch_alloc(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 986 | if (ep) { |
| 987 | ep->class = fc_frame_class(fp); |
| 988 | |
| 989 | /* |
| 990 | * Set EX_CTX indicating we're responding on this exchange. |
| 991 | */ |
| 992 | ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */ |
| 993 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */ |
| 994 | fh = fc_frame_header_get(fp); |
| 995 | ep->sid = ntoh24(fh->fh_d_id); |
| 996 | ep->did = ntoh24(fh->fh_s_id); |
| 997 | ep->oid = ep->did; |
| 998 | |
| 999 | /* |
| 1000 | * Allocated exchange has placed the XID in the |
| 1001 | * originator field. Move it to the responder field, |
| 1002 | * and set the originator XID from the frame. |
| 1003 | */ |
| 1004 | ep->rxid = ep->xid; |
| 1005 | ep->oxid = ntohs(fh->fh_ox_id); |
| 1006 | ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT; |
| 1007 | if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0) |
| 1008 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
| 1009 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1010 | fc_exch_hold(ep); /* hold for caller */ |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 1011 | spin_unlock_bh(&ep->ex_lock); /* lock from fc_exch_alloc */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1012 | } |
| 1013 | return ep; |
| 1014 | } |
| 1015 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1016 | /** |
| 1017 | * fc_seq_lookup_recip() - Find a sequence where the other end |
| 1018 | * originated the sequence |
| 1019 | * @lport: The local port that the frame was sent to |
| 1020 | * @mp: The Exchange Manager to lookup the exchange from |
| 1021 | * @fp: The frame associated with the sequence we're looking for |
| 1022 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1023 | * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold |
| 1024 | * on the ep that should be released by the caller. |
| 1025 | */ |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 1026 | static enum fc_pf_rjt_reason fc_seq_lookup_recip(struct fc_lport *lport, |
| 1027 | struct fc_exch_mgr *mp, |
Robert Love | b2ab99c | 2009-02-27 10:55:50 -0800 | [diff] [blame] | 1028 | struct fc_frame *fp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1029 | { |
| 1030 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 1031 | struct fc_exch *ep = NULL; |
| 1032 | struct fc_seq *sp = NULL; |
| 1033 | enum fc_pf_rjt_reason reject = FC_RJT_NONE; |
| 1034 | u32 f_ctl; |
| 1035 | u16 xid; |
| 1036 | |
| 1037 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 1038 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0); |
| 1039 | |
| 1040 | /* |
| 1041 | * Lookup or create the exchange if we will be creating the sequence. |
| 1042 | */ |
| 1043 | if (f_ctl & FC_FC_EX_CTX) { |
| 1044 | xid = ntohs(fh->fh_ox_id); /* we originated exch */ |
| 1045 | ep = fc_exch_find(mp, xid); |
| 1046 | if (!ep) { |
| 1047 | atomic_inc(&mp->stats.xid_not_found); |
| 1048 | reject = FC_RJT_OX_ID; |
| 1049 | goto out; |
| 1050 | } |
| 1051 | if (ep->rxid == FC_XID_UNKNOWN) |
| 1052 | ep->rxid = ntohs(fh->fh_rx_id); |
| 1053 | else if (ep->rxid != ntohs(fh->fh_rx_id)) { |
| 1054 | reject = FC_RJT_OX_ID; |
| 1055 | goto rel; |
| 1056 | } |
| 1057 | } else { |
| 1058 | xid = ntohs(fh->fh_rx_id); /* we are the responder */ |
| 1059 | |
| 1060 | /* |
| 1061 | * Special case for MDS issuing an ELS TEST with a |
| 1062 | * bad rxid of 0. |
| 1063 | * XXX take this out once we do the proper reject. |
| 1064 | */ |
| 1065 | if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ && |
| 1066 | fc_frame_payload_op(fp) == ELS_TEST) { |
| 1067 | fh->fh_rx_id = htons(FC_XID_UNKNOWN); |
| 1068 | xid = FC_XID_UNKNOWN; |
| 1069 | } |
| 1070 | |
| 1071 | /* |
| 1072 | * new sequence - find the exchange |
| 1073 | */ |
| 1074 | ep = fc_exch_find(mp, xid); |
| 1075 | if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) { |
| 1076 | if (ep) { |
| 1077 | atomic_inc(&mp->stats.xid_busy); |
| 1078 | reject = FC_RJT_RX_ID; |
| 1079 | goto rel; |
| 1080 | } |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 1081 | ep = fc_exch_resp(lport, mp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1082 | if (!ep) { |
| 1083 | reject = FC_RJT_EXCH_EST; /* XXX */ |
| 1084 | goto out; |
| 1085 | } |
| 1086 | xid = ep->xid; /* get our XID */ |
| 1087 | } else if (!ep) { |
| 1088 | atomic_inc(&mp->stats.xid_not_found); |
| 1089 | reject = FC_RJT_RX_ID; /* XID not found */ |
| 1090 | goto out; |
| 1091 | } |
| 1092 | } |
| 1093 | |
Bart Van Assche | 5d73bea | 2013-08-14 15:37:08 +0000 | [diff] [blame] | 1094 | spin_lock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1095 | /* |
| 1096 | * At this point, we have the exchange held. |
| 1097 | * Find or create the sequence. |
| 1098 | */ |
| 1099 | if (fc_sof_is_init(fr_sof(fp))) { |
Vasu Dev | a104c84 | 2010-03-12 16:08:34 -0800 | [diff] [blame] | 1100 | sp = &ep->seq; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1101 | sp->ssb_stat |= SSB_ST_RESP; |
Joe Eykholt | b3667f9 | 2010-05-07 15:18:13 -0700 | [diff] [blame] | 1102 | sp->id = fh->fh_seq_id; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1103 | } else { |
| 1104 | sp = &ep->seq; |
| 1105 | if (sp->id != fh->fh_seq_id) { |
| 1106 | atomic_inc(&mp->stats.seq_not_found); |
Kiran Patil | e3e65c6 | 2011-06-20 16:59:30 -0700 | [diff] [blame] | 1107 | if (f_ctl & FC_FC_END_SEQ) { |
| 1108 | /* |
| 1109 | * Update sequence_id based on incoming last |
| 1110 | * frame of sequence exchange. This is needed |
Vasu Dev | 1bd49b4 | 2012-05-25 10:26:43 -0700 | [diff] [blame] | 1111 | * for FC target where DDP has been used |
Kiran Patil | e3e65c6 | 2011-06-20 16:59:30 -0700 | [diff] [blame] | 1112 | * on target where, stack is indicated only |
| 1113 | * about last frame's (payload _header) header. |
| 1114 | * Whereas "seq_id" which is part of |
| 1115 | * frame_header is allocated by initiator |
| 1116 | * which is totally different from "seq_id" |
| 1117 | * allocated when XFER_RDY was sent by target. |
| 1118 | * To avoid false -ve which results into not |
| 1119 | * sending RSP, hence write request on other |
| 1120 | * end never finishes. |
| 1121 | */ |
Kiran Patil | e3e65c6 | 2011-06-20 16:59:30 -0700 | [diff] [blame] | 1122 | sp->ssb_stat |= SSB_ST_RESP; |
| 1123 | sp->id = fh->fh_seq_id; |
Kiran Patil | e3e65c6 | 2011-06-20 16:59:30 -0700 | [diff] [blame] | 1124 | } else { |
Bart Van Assche | 5d73bea | 2013-08-14 15:37:08 +0000 | [diff] [blame] | 1125 | spin_unlock_bh(&ep->ex_lock); |
| 1126 | |
Kiran Patil | e3e65c6 | 2011-06-20 16:59:30 -0700 | [diff] [blame] | 1127 | /* sequence/exch should exist */ |
| 1128 | reject = FC_RJT_SEQ_ID; |
| 1129 | goto rel; |
| 1130 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1131 | } |
| 1132 | } |
| 1133 | WARN_ON(ep != fc_seq_exch(sp)); |
| 1134 | |
| 1135 | if (f_ctl & FC_FC_SEQ_INIT) |
| 1136 | ep->esb_stat |= ESB_ST_SEQ_INIT; |
Bart Van Assche | 5d73bea | 2013-08-14 15:37:08 +0000 | [diff] [blame] | 1137 | spin_unlock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1138 | |
| 1139 | fr_seq(fp) = sp; |
| 1140 | out: |
| 1141 | return reject; |
| 1142 | rel: |
| 1143 | fc_exch_done(&ep->seq); |
| 1144 | fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */ |
| 1145 | return reject; |
| 1146 | } |
| 1147 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1148 | /** |
| 1149 | * fc_seq_lookup_orig() - Find a sequence where this end |
| 1150 | * originated the sequence |
| 1151 | * @mp: The Exchange Manager to lookup the exchange from |
| 1152 | * @fp: The frame associated with the sequence we're looking for |
| 1153 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1154 | * Does not hold the sequence for the caller. |
| 1155 | */ |
| 1156 | static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp, |
| 1157 | struct fc_frame *fp) |
| 1158 | { |
| 1159 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 1160 | struct fc_exch *ep; |
| 1161 | struct fc_seq *sp = NULL; |
| 1162 | u32 f_ctl; |
| 1163 | u16 xid; |
| 1164 | |
| 1165 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 1166 | WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX); |
| 1167 | xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id); |
| 1168 | ep = fc_exch_find(mp, xid); |
| 1169 | if (!ep) |
| 1170 | return NULL; |
| 1171 | if (ep->seq.id == fh->fh_seq_id) { |
| 1172 | /* |
| 1173 | * Save the RX_ID if we didn't previously know it. |
| 1174 | */ |
| 1175 | sp = &ep->seq; |
| 1176 | if ((f_ctl & FC_FC_EX_CTX) != 0 && |
| 1177 | ep->rxid == FC_XID_UNKNOWN) { |
| 1178 | ep->rxid = ntohs(fh->fh_rx_id); |
| 1179 | } |
| 1180 | } |
| 1181 | fc_exch_release(ep); |
| 1182 | return sp; |
| 1183 | } |
| 1184 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1185 | /** |
| 1186 | * fc_exch_set_addr() - Set the source and destination IDs for an exchange |
| 1187 | * @ep: The exchange to set the addresses for |
| 1188 | * @orig_id: The originator's ID |
| 1189 | * @resp_id: The responder's ID |
| 1190 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1191 | * Note this must be done before the first sequence of the exchange is sent. |
| 1192 | */ |
| 1193 | static void fc_exch_set_addr(struct fc_exch *ep, |
| 1194 | u32 orig_id, u32 resp_id) |
| 1195 | { |
| 1196 | ep->oid = orig_id; |
| 1197 | if (ep->esb_stat & ESB_ST_RESP) { |
| 1198 | ep->sid = resp_id; |
| 1199 | ep->did = orig_id; |
| 1200 | } else { |
| 1201 | ep->sid = orig_id; |
| 1202 | ep->did = resp_id; |
| 1203 | } |
| 1204 | } |
| 1205 | |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 1206 | /** |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1207 | * fc_seq_els_rsp_send() - Send an ELS response using information from |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1208 | * the existing sequence/exchange. |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1209 | * @fp: The received frame |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1210 | * @els_cmd: The ELS command to be sent |
| 1211 | * @els_data: The ELS data to be sent |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1212 | * |
| 1213 | * The received frame is not freed. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1214 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1215 | static void fc_seq_els_rsp_send(struct fc_frame *fp, enum fc_els_cmd els_cmd, |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 1216 | struct fc_seq_els_data *els_data) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1217 | { |
| 1218 | switch (els_cmd) { |
| 1219 | case ELS_LS_RJT: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1220 | fc_seq_ls_rjt(fp, els_data->reason, els_data->explan); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1221 | break; |
| 1222 | case ELS_LS_ACC: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1223 | fc_seq_ls_acc(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1224 | break; |
| 1225 | case ELS_RRQ: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1226 | fc_exch_els_rrq(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1227 | break; |
| 1228 | case ELS_REC: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1229 | fc_exch_els_rec(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1230 | break; |
| 1231 | default: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1232 | FC_LPORT_DBG(fr_dev(fp), "Invalid ELS CMD:%x\n", els_cmd); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1233 | } |
| 1234 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1235 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1236 | /** |
| 1237 | * fc_seq_send_last() - Send a sequence that is the last in the exchange |
| 1238 | * @sp: The sequence that is to be sent |
| 1239 | * @fp: The frame that will be sent on the sequence |
| 1240 | * @rctl: The R_CTL information to be sent |
| 1241 | * @fh_type: The frame header type |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1242 | */ |
| 1243 | static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp, |
| 1244 | enum fc_rctl rctl, enum fc_fh_type fh_type) |
| 1245 | { |
| 1246 | u32 f_ctl; |
| 1247 | struct fc_exch *ep = fc_seq_exch(sp); |
| 1248 | |
| 1249 | f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT; |
| 1250 | f_ctl |= ep->f_ctl; |
| 1251 | fc_fill_fc_hdr(fp, rctl, ep->did, ep->sid, fh_type, f_ctl, 0); |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 1252 | fc_seq_send_locked(ep->lp, sp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1253 | } |
| 1254 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1255 | /** |
| 1256 | * fc_seq_send_ack() - Send an acknowledgement that we've received a frame |
| 1257 | * @sp: The sequence to send the ACK on |
| 1258 | * @rx_fp: The received frame that is being acknoledged |
| 1259 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1260 | * Send ACK_1 (or equiv.) indicating we received something. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1261 | */ |
| 1262 | static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp) |
| 1263 | { |
| 1264 | struct fc_frame *fp; |
| 1265 | struct fc_frame_header *rx_fh; |
| 1266 | struct fc_frame_header *fh; |
| 1267 | struct fc_exch *ep = fc_seq_exch(sp); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1268 | struct fc_lport *lport = ep->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1269 | unsigned int f_ctl; |
| 1270 | |
| 1271 | /* |
| 1272 | * Don't send ACKs for class 3. |
| 1273 | */ |
| 1274 | if (fc_sof_needs_ack(fr_sof(rx_fp))) { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1275 | fp = fc_frame_alloc(lport, 0); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1276 | if (!fp) { |
| 1277 | FC_EXCH_DBG(ep, "Drop ACK request, out of memory\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1278 | return; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1279 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1280 | |
| 1281 | fh = fc_frame_header_get(fp); |
| 1282 | fh->fh_r_ctl = FC_RCTL_ACK_1; |
| 1283 | fh->fh_type = FC_TYPE_BLS; |
| 1284 | |
| 1285 | /* |
| 1286 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). |
| 1287 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. |
| 1288 | * Bits 9-8 are meaningful (retransmitted or unidirectional). |
| 1289 | * Last ACK uses bits 7-6 (continue sequence), |
| 1290 | * bits 5-4 are meaningful (what kind of ACK to use). |
| 1291 | */ |
| 1292 | rx_fh = fc_frame_header_get(rx_fp); |
| 1293 | f_ctl = ntoh24(rx_fh->fh_f_ctl); |
| 1294 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | |
| 1295 | FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ | |
| 1296 | FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT | |
| 1297 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; |
| 1298 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; |
| 1299 | hton24(fh->fh_f_ctl, f_ctl); |
| 1300 | |
| 1301 | fc_exch_setup_hdr(ep, fp, f_ctl); |
| 1302 | fh->fh_seq_id = rx_fh->fh_seq_id; |
| 1303 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
| 1304 | fh->fh_parm_offset = htonl(1); /* ack single frame */ |
| 1305 | |
| 1306 | fr_sof(fp) = fr_sof(rx_fp); |
| 1307 | if (f_ctl & FC_FC_END_SEQ) |
| 1308 | fr_eof(fp) = FC_EOF_T; |
| 1309 | else |
| 1310 | fr_eof(fp) = FC_EOF_N; |
| 1311 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1312 | lport->tt.frame_send(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1313 | } |
| 1314 | } |
| 1315 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1316 | /** |
| 1317 | * fc_exch_send_ba_rjt() - Send BLS Reject |
| 1318 | * @rx_fp: The frame being rejected |
| 1319 | * @reason: The reason the frame is being rejected |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1320 | * @explan: The explanation for the rejection |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1321 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1322 | * This is for rejecting BA_ABTS only. |
| 1323 | */ |
Robert Love | b2ab99c | 2009-02-27 10:55:50 -0800 | [diff] [blame] | 1324 | static void fc_exch_send_ba_rjt(struct fc_frame *rx_fp, |
| 1325 | enum fc_ba_rjt_reason reason, |
| 1326 | enum fc_ba_rjt_explan explan) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1327 | { |
| 1328 | struct fc_frame *fp; |
| 1329 | struct fc_frame_header *rx_fh; |
| 1330 | struct fc_frame_header *fh; |
| 1331 | struct fc_ba_rjt *rp; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1332 | struct fc_seq *sp; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1333 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1334 | unsigned int f_ctl; |
| 1335 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1336 | lport = fr_dev(rx_fp); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1337 | sp = fr_seq(rx_fp); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1338 | fp = fc_frame_alloc(lport, sizeof(*rp)); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1339 | if (!fp) { |
| 1340 | FC_EXCH_DBG(fc_seq_exch(sp), |
| 1341 | "Drop BA_RJT request, out of memory\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1342 | return; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1343 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1344 | fh = fc_frame_header_get(fp); |
| 1345 | rx_fh = fc_frame_header_get(rx_fp); |
| 1346 | |
| 1347 | memset(fh, 0, sizeof(*fh) + sizeof(*rp)); |
| 1348 | |
| 1349 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
| 1350 | rp->br_reason = reason; |
| 1351 | rp->br_explan = explan; |
| 1352 | |
| 1353 | /* |
| 1354 | * seq_id, cs_ctl, df_ctl and param/offset are zero. |
| 1355 | */ |
| 1356 | memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3); |
| 1357 | memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3); |
Joe Eykholt | 1d490ce | 2009-08-25 14:04:03 -0700 | [diff] [blame] | 1358 | fh->fh_ox_id = rx_fh->fh_ox_id; |
| 1359 | fh->fh_rx_id = rx_fh->fh_rx_id; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1360 | fh->fh_seq_cnt = rx_fh->fh_seq_cnt; |
| 1361 | fh->fh_r_ctl = FC_RCTL_BA_RJT; |
| 1362 | fh->fh_type = FC_TYPE_BLS; |
| 1363 | |
| 1364 | /* |
| 1365 | * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22). |
| 1366 | * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT. |
| 1367 | * Bits 9-8 are meaningful (retransmitted or unidirectional). |
| 1368 | * Last ACK uses bits 7-6 (continue sequence), |
| 1369 | * bits 5-4 are meaningful (what kind of ACK to use). |
| 1370 | * Always set LAST_SEQ, END_SEQ. |
| 1371 | */ |
| 1372 | f_ctl = ntoh24(rx_fh->fh_f_ctl); |
| 1373 | f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX | |
| 1374 | FC_FC_END_CONN | FC_FC_SEQ_INIT | |
| 1375 | FC_FC_RETX_SEQ | FC_FC_UNI_TX; |
| 1376 | f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX; |
| 1377 | f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ; |
| 1378 | f_ctl &= ~FC_FC_FIRST_SEQ; |
| 1379 | hton24(fh->fh_f_ctl, f_ctl); |
| 1380 | |
| 1381 | fr_sof(fp) = fc_sof_class(fr_sof(rx_fp)); |
| 1382 | fr_eof(fp) = FC_EOF_T; |
| 1383 | if (fc_sof_needs_ack(fr_sof(fp))) |
| 1384 | fr_eof(fp) = FC_EOF_N; |
| 1385 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1386 | lport->tt.frame_send(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1387 | } |
| 1388 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1389 | /** |
| 1390 | * fc_exch_recv_abts() - Handle an incoming ABTS |
| 1391 | * @ep: The exchange the abort was on |
| 1392 | * @rx_fp: The ABTS frame |
| 1393 | * |
| 1394 | * This would be for target mode usually, but could be due to lost |
| 1395 | * FCP transfer ready, confirm or RRQ. We always handle this as an |
| 1396 | * exchange abort, ignoring the parameter. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1397 | */ |
| 1398 | static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp) |
| 1399 | { |
| 1400 | struct fc_frame *fp; |
| 1401 | struct fc_ba_acc *ap; |
| 1402 | struct fc_frame_header *fh; |
| 1403 | struct fc_seq *sp; |
| 1404 | |
| 1405 | if (!ep) |
| 1406 | goto reject; |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1407 | |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1408 | FC_EXCH_DBG(ep, "exch: ABTS received\n"); |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1409 | fp = fc_frame_alloc(ep->lp, sizeof(*ap)); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1410 | if (!fp) { |
| 1411 | FC_EXCH_DBG(ep, "Drop ABTS request, out of memory\n"); |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1412 | goto free; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1413 | } |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1414 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1415 | spin_lock_bh(&ep->ex_lock); |
| 1416 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
| 1417 | spin_unlock_bh(&ep->ex_lock); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1418 | FC_EXCH_DBG(ep, "exch: ABTS rejected, exchange complete\n"); |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1419 | fc_frame_free(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1420 | goto reject; |
| 1421 | } |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 1422 | if (!(ep->esb_stat & ESB_ST_REC_QUAL)) { |
| 1423 | ep->esb_stat |= ESB_ST_REC_QUAL; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1424 | fc_exch_hold(ep); /* hold for REC_QUAL */ |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 1425 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1426 | fc_exch_timer_set_locked(ep, ep->r_a_tov); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1427 | fh = fc_frame_header_get(fp); |
| 1428 | ap = fc_frame_payload_get(fp, sizeof(*ap)); |
| 1429 | memset(ap, 0, sizeof(*ap)); |
| 1430 | sp = &ep->seq; |
| 1431 | ap->ba_high_seq_cnt = htons(0xffff); |
| 1432 | if (sp->ssb_stat & SSB_ST_RESP) { |
| 1433 | ap->ba_seq_id = sp->id; |
| 1434 | ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL; |
| 1435 | ap->ba_high_seq_cnt = fh->fh_seq_cnt; |
| 1436 | ap->ba_low_seq_cnt = htons(sp->cnt); |
| 1437 | } |
Vasu Dev | a7e84f2 | 2009-02-27 10:54:51 -0800 | [diff] [blame] | 1438 | sp = fc_seq_start_next_locked(sp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1439 | fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS); |
Bart Van Assche | cae7b6d | 2013-08-14 15:37:52 +0000 | [diff] [blame] | 1440 | ep->esb_stat |= ESB_ST_ABNORMAL; |
Neil Horman | fb00cc2 | 2013-05-03 19:34:15 +0000 | [diff] [blame] | 1441 | spin_unlock_bh(&ep->ex_lock); |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1442 | |
| 1443 | free: |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1444 | fc_frame_free(rx_fp); |
| 1445 | return; |
| 1446 | |
| 1447 | reject: |
| 1448 | fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID); |
Bart Van Assche | f95b35c | 2013-08-14 15:38:24 +0000 | [diff] [blame] | 1449 | goto free; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1450 | } |
| 1451 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1452 | /** |
Joe Eykholt | 239e810 | 2010-07-20 15:21:07 -0700 | [diff] [blame] | 1453 | * fc_seq_assign() - Assign exchange and sequence for incoming request |
| 1454 | * @lport: The local port that received the request |
| 1455 | * @fp: The request frame |
| 1456 | * |
| 1457 | * On success, the sequence pointer will be returned and also in fr_seq(@fp). |
Joe Eykholt | 62bdb64 | 2011-01-28 16:04:34 -0800 | [diff] [blame] | 1458 | * A reference will be held on the exchange/sequence for the caller, which |
| 1459 | * must call fc_seq_release(). |
Joe Eykholt | 239e810 | 2010-07-20 15:21:07 -0700 | [diff] [blame] | 1460 | */ |
| 1461 | static struct fc_seq *fc_seq_assign(struct fc_lport *lport, struct fc_frame *fp) |
| 1462 | { |
| 1463 | struct fc_exch_mgr_anchor *ema; |
| 1464 | |
| 1465 | WARN_ON(lport != fr_dev(fp)); |
| 1466 | WARN_ON(fr_seq(fp)); |
| 1467 | fr_seq(fp) = NULL; |
| 1468 | |
| 1469 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
| 1470 | if ((!ema->match || ema->match(fp)) && |
Hillf Danton | 530994d | 2010-11-30 16:18:28 -0800 | [diff] [blame] | 1471 | fc_seq_lookup_recip(lport, ema->mp, fp) == FC_RJT_NONE) |
Joe Eykholt | 239e810 | 2010-07-20 15:21:07 -0700 | [diff] [blame] | 1472 | break; |
| 1473 | return fr_seq(fp); |
| 1474 | } |
| 1475 | |
| 1476 | /** |
Joe Eykholt | 62bdb64 | 2011-01-28 16:04:34 -0800 | [diff] [blame] | 1477 | * fc_seq_release() - Release the hold |
| 1478 | * @sp: The sequence. |
| 1479 | */ |
| 1480 | static void fc_seq_release(struct fc_seq *sp) |
| 1481 | { |
| 1482 | fc_exch_release(fc_seq_exch(sp)); |
| 1483 | } |
| 1484 | |
| 1485 | /** |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1486 | * fc_exch_recv_req() - Handler for an incoming request |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1487 | * @lport: The local port that received the request |
| 1488 | * @mp: The EM that the exchange is on |
| 1489 | * @fp: The request frame |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1490 | * |
| 1491 | * This is used when the other end is originating the exchange |
| 1492 | * and the sequence. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1493 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1494 | static void fc_exch_recv_req(struct fc_lport *lport, struct fc_exch_mgr *mp, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1495 | struct fc_frame *fp) |
| 1496 | { |
| 1497 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 1498 | struct fc_seq *sp = NULL; |
| 1499 | struct fc_exch *ep = NULL; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1500 | enum fc_pf_rjt_reason reject; |
| 1501 | |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 1502 | /* We can have the wrong fc_lport at this point with NPIV, which is a |
| 1503 | * problem now that we know a new exchange needs to be allocated |
| 1504 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1505 | lport = fc_vport_id_lookup(lport, ntoh24(fh->fh_d_id)); |
| 1506 | if (!lport) { |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 1507 | fc_frame_free(fp); |
| 1508 | return; |
| 1509 | } |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1510 | fr_dev(fp) = lport; |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 1511 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1512 | BUG_ON(fr_seq(fp)); /* XXX remove later */ |
| 1513 | |
| 1514 | /* |
| 1515 | * If the RX_ID is 0xffff, don't allocate an exchange. |
| 1516 | * The upper-level protocol may request one later, if needed. |
| 1517 | */ |
| 1518 | if (fh->fh_rx_id == htons(FC_XID_UNKNOWN)) |
| 1519 | return lport->tt.lport_recv(lport, fp); |
| 1520 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1521 | reject = fc_seq_lookup_recip(lport, mp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1522 | if (reject == FC_RJT_NONE) { |
| 1523 | sp = fr_seq(fp); /* sequence will be held */ |
| 1524 | ep = fc_seq_exch(sp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1525 | fc_seq_send_ack(sp, fp); |
Joe Eykholt | f60e12e | 2010-07-20 15:20:14 -0700 | [diff] [blame] | 1526 | ep->encaps = fr_encaps(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1527 | |
| 1528 | /* |
| 1529 | * Call the receive function. |
| 1530 | * |
| 1531 | * The receive function may allocate a new sequence |
| 1532 | * over the old one, so we shouldn't change the |
| 1533 | * sequence after this. |
| 1534 | * |
| 1535 | * The frame will be freed by the receive function. |
| 1536 | * If new exch resp handler is valid then call that |
| 1537 | * first. |
| 1538 | */ |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1539 | if (!fc_invoke_resp(ep, sp, fp)) |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1540 | lport->tt.lport_recv(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1541 | fc_exch_release(ep); /* release from lookup */ |
| 1542 | } else { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1543 | FC_LPORT_DBG(lport, "exch/seq lookup failed: reject %x\n", |
| 1544 | reject); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1545 | fc_frame_free(fp); |
| 1546 | } |
| 1547 | } |
| 1548 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1549 | /** |
| 1550 | * fc_exch_recv_seq_resp() - Handler for an incoming response where the other |
| 1551 | * end is the originator of the sequence that is a |
| 1552 | * response to our initial exchange |
| 1553 | * @mp: The EM that the exchange is on |
| 1554 | * @fp: The response frame |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1555 | */ |
| 1556 | static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) |
| 1557 | { |
| 1558 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
| 1559 | struct fc_seq *sp; |
| 1560 | struct fc_exch *ep; |
| 1561 | enum fc_sof sof; |
| 1562 | u32 f_ctl; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1563 | int rc; |
| 1564 | |
| 1565 | ep = fc_exch_find(mp, ntohs(fh->fh_ox_id)); |
| 1566 | if (!ep) { |
| 1567 | atomic_inc(&mp->stats.xid_not_found); |
| 1568 | goto out; |
| 1569 | } |
Steve Ma | 30121d1 | 2009-05-06 10:52:29 -0700 | [diff] [blame] | 1570 | if (ep->esb_stat & ESB_ST_COMPLETE) { |
| 1571 | atomic_inc(&mp->stats.xid_not_found); |
Hillf Danton | 8236554 | 2010-11-30 16:18:12 -0800 | [diff] [blame] | 1572 | goto rel; |
Steve Ma | 30121d1 | 2009-05-06 10:52:29 -0700 | [diff] [blame] | 1573 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1574 | if (ep->rxid == FC_XID_UNKNOWN) |
| 1575 | ep->rxid = ntohs(fh->fh_rx_id); |
| 1576 | if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) { |
| 1577 | atomic_inc(&mp->stats.xid_not_found); |
| 1578 | goto rel; |
| 1579 | } |
| 1580 | if (ep->did != ntoh24(fh->fh_s_id) && |
| 1581 | ep->did != FC_FID_FLOGI) { |
| 1582 | atomic_inc(&mp->stats.xid_not_found); |
| 1583 | goto rel; |
| 1584 | } |
| 1585 | sof = fr_sof(fp); |
Vasu Dev | a104c84 | 2010-03-12 16:08:34 -0800 | [diff] [blame] | 1586 | sp = &ep->seq; |
Joe Eykholt | b3667f9 | 2010-05-07 15:18:13 -0700 | [diff] [blame] | 1587 | if (fc_sof_is_init(sof)) { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1588 | sp->ssb_stat |= SSB_ST_RESP; |
Joe Eykholt | b3667f9 | 2010-05-07 15:18:13 -0700 | [diff] [blame] | 1589 | sp->id = fh->fh_seq_id; |
| 1590 | } else if (sp->id != fh->fh_seq_id) { |
| 1591 | atomic_inc(&mp->stats.seq_not_found); |
| 1592 | goto rel; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1593 | } |
Vasu Dev | a104c84 | 2010-03-12 16:08:34 -0800 | [diff] [blame] | 1594 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1595 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 1596 | fr_seq(fp) = sp; |
Bart Van Assche | 5d73bea | 2013-08-14 15:37:08 +0000 | [diff] [blame] | 1597 | |
| 1598 | spin_lock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1599 | if (f_ctl & FC_FC_SEQ_INIT) |
| 1600 | ep->esb_stat |= ESB_ST_SEQ_INIT; |
Bart Van Assche | 5d73bea | 2013-08-14 15:37:08 +0000 | [diff] [blame] | 1601 | spin_unlock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1602 | |
| 1603 | if (fc_sof_needs_ack(sof)) |
| 1604 | fc_seq_send_ack(sp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1605 | |
| 1606 | if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T && |
| 1607 | (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) == |
| 1608 | (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) { |
| 1609 | spin_lock_bh(&ep->ex_lock); |
| 1610 | rc = fc_exch_done_locked(ep); |
| 1611 | WARN_ON(fc_seq_exch(sp) != ep); |
| 1612 | spin_unlock_bh(&ep->ex_lock); |
| 1613 | if (!rc) |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1614 | fc_exch_delete(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1615 | } |
| 1616 | |
| 1617 | /* |
| 1618 | * Call the receive function. |
| 1619 | * The sequence is held (has a refcnt) for us, |
| 1620 | * but not for the receive function. |
| 1621 | * |
| 1622 | * The receive function may allocate a new sequence |
| 1623 | * over the old one, so we shouldn't change the |
| 1624 | * sequence after this. |
| 1625 | * |
| 1626 | * The frame will be freed by the receive function. |
| 1627 | * If new exch resp handler is valid then call that |
| 1628 | * first. |
| 1629 | */ |
Bart Van Assche | f6979ad | 2015-06-05 14:20:46 -0700 | [diff] [blame] | 1630 | if (!fc_invoke_resp(ep, sp, fp)) |
| 1631 | fc_frame_free(fp); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1632 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1633 | fc_exch_release(ep); |
| 1634 | return; |
| 1635 | rel: |
| 1636 | fc_exch_release(ep); |
| 1637 | out: |
| 1638 | fc_frame_free(fp); |
| 1639 | } |
| 1640 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1641 | /** |
| 1642 | * fc_exch_recv_resp() - Handler for a sequence where other end is |
| 1643 | * responding to our sequence |
| 1644 | * @mp: The EM that the exchange is on |
| 1645 | * @fp: The response frame |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1646 | */ |
| 1647 | static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp) |
| 1648 | { |
| 1649 | struct fc_seq *sp; |
| 1650 | |
| 1651 | sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */ |
Robert Love | d459b7e | 2009-07-29 17:05:05 -0700 | [diff] [blame] | 1652 | |
| 1653 | if (!sp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1654 | atomic_inc(&mp->stats.xid_not_found); |
Robert Love | d459b7e | 2009-07-29 17:05:05 -0700 | [diff] [blame] | 1655 | else |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1656 | atomic_inc(&mp->stats.non_bls_resp); |
Robert Love | d459b7e | 2009-07-29 17:05:05 -0700 | [diff] [blame] | 1657 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1658 | fc_frame_free(fp); |
| 1659 | } |
| 1660 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1661 | /** |
| 1662 | * fc_exch_abts_resp() - Handler for a response to an ABT |
| 1663 | * @ep: The exchange that the frame is on |
| 1664 | * @fp: The response frame |
| 1665 | * |
| 1666 | * This response would be to an ABTS cancelling an exchange or sequence. |
| 1667 | * The response can be either BA_ACC or BA_RJT |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1668 | */ |
| 1669 | static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp) |
| 1670 | { |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1671 | struct fc_frame_header *fh; |
| 1672 | struct fc_ba_acc *ap; |
| 1673 | struct fc_seq *sp; |
| 1674 | u16 low; |
| 1675 | u16 high; |
| 1676 | int rc = 1, has_rec = 0; |
| 1677 | |
| 1678 | fh = fc_frame_header_get(fp); |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 1679 | FC_EXCH_DBG(ep, "exch: BLS rctl %x - %s\n", fh->fh_r_ctl, |
| 1680 | fc_exch_rctl_name(fh->fh_r_ctl)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1681 | |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 1682 | if (cancel_delayed_work_sync(&ep->timeout_work)) { |
Robert Love | 3a29260 | 2013-06-11 07:28:09 +0000 | [diff] [blame] | 1683 | FC_EXCH_DBG(ep, "Exchange timer canceled due to ABTS response\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1684 | fc_exch_release(ep); /* release from pending timer hold */ |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 1685 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1686 | |
| 1687 | spin_lock_bh(&ep->ex_lock); |
| 1688 | switch (fh->fh_r_ctl) { |
| 1689 | case FC_RCTL_BA_ACC: |
| 1690 | ap = fc_frame_payload_get(fp, sizeof(*ap)); |
| 1691 | if (!ap) |
| 1692 | break; |
| 1693 | |
| 1694 | /* |
| 1695 | * Decide whether to establish a Recovery Qualifier. |
| 1696 | * We do this if there is a non-empty SEQ_CNT range and |
| 1697 | * SEQ_ID is the same as the one we aborted. |
| 1698 | */ |
| 1699 | low = ntohs(ap->ba_low_seq_cnt); |
| 1700 | high = ntohs(ap->ba_high_seq_cnt); |
| 1701 | if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 && |
| 1702 | (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL || |
| 1703 | ap->ba_seq_id == ep->seq_id) && low != high) { |
| 1704 | ep->esb_stat |= ESB_ST_REC_QUAL; |
| 1705 | fc_exch_hold(ep); /* hold for recovery qualifier */ |
| 1706 | has_rec = 1; |
| 1707 | } |
| 1708 | break; |
| 1709 | case FC_RCTL_BA_RJT: |
| 1710 | break; |
| 1711 | default: |
| 1712 | break; |
| 1713 | } |
| 1714 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1715 | /* do we need to do some other checks here. Can we reuse more of |
| 1716 | * fc_exch_recv_seq_resp |
| 1717 | */ |
| 1718 | sp = &ep->seq; |
| 1719 | /* |
| 1720 | * do we want to check END_SEQ as well as LAST_SEQ here? |
| 1721 | */ |
| 1722 | if (ep->fh_type != FC_TYPE_FCP && |
| 1723 | ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ) |
| 1724 | rc = fc_exch_done_locked(ep); |
| 1725 | spin_unlock_bh(&ep->ex_lock); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1726 | |
| 1727 | fc_exch_hold(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1728 | if (!rc) |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1729 | fc_exch_delete(ep); |
Bart Van Assche | f6979ad | 2015-06-05 14:20:46 -0700 | [diff] [blame] | 1730 | if (!fc_invoke_resp(ep, sp, fp)) |
| 1731 | fc_frame_free(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1732 | if (has_rec) |
| 1733 | fc_exch_timer_set(ep, ep->r_a_tov); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1734 | fc_exch_release(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1735 | } |
| 1736 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1737 | /** |
| 1738 | * fc_exch_recv_bls() - Handler for a BLS sequence |
| 1739 | * @mp: The EM that the exchange is on |
| 1740 | * @fp: The request frame |
| 1741 | * |
| 1742 | * The BLS frame is always a sequence initiated by the remote side. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1743 | * We may be either the originator or recipient of the exchange. |
| 1744 | */ |
| 1745 | static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp) |
| 1746 | { |
| 1747 | struct fc_frame_header *fh; |
| 1748 | struct fc_exch *ep; |
| 1749 | u32 f_ctl; |
| 1750 | |
| 1751 | fh = fc_frame_header_get(fp); |
| 1752 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 1753 | fr_seq(fp) = NULL; |
| 1754 | |
| 1755 | ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ? |
| 1756 | ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id)); |
| 1757 | if (ep && (f_ctl & FC_FC_SEQ_INIT)) { |
| 1758 | spin_lock_bh(&ep->ex_lock); |
| 1759 | ep->esb_stat |= ESB_ST_SEQ_INIT; |
| 1760 | spin_unlock_bh(&ep->ex_lock); |
| 1761 | } |
| 1762 | if (f_ctl & FC_FC_SEQ_CTX) { |
| 1763 | /* |
| 1764 | * A response to a sequence we initiated. |
| 1765 | * This should only be ACKs for class 2 or F. |
| 1766 | */ |
| 1767 | switch (fh->fh_r_ctl) { |
| 1768 | case FC_RCTL_ACK_1: |
| 1769 | case FC_RCTL_ACK_0: |
| 1770 | break; |
| 1771 | default: |
Bhanu Prakash Gollapudi | d4042e9 | 2012-02-10 17:18:51 -0800 | [diff] [blame] | 1772 | if (ep) |
Bart Van Assche | b20d9bf | 2013-08-14 15:32:51 +0000 | [diff] [blame] | 1773 | FC_EXCH_DBG(ep, "BLS rctl %x - %s received\n", |
Bhanu Prakash Gollapudi | d4042e9 | 2012-02-10 17:18:51 -0800 | [diff] [blame] | 1774 | fh->fh_r_ctl, |
| 1775 | fc_exch_rctl_name(fh->fh_r_ctl)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1776 | break; |
| 1777 | } |
| 1778 | fc_frame_free(fp); |
| 1779 | } else { |
| 1780 | switch (fh->fh_r_ctl) { |
| 1781 | case FC_RCTL_BA_RJT: |
| 1782 | case FC_RCTL_BA_ACC: |
| 1783 | if (ep) |
| 1784 | fc_exch_abts_resp(ep, fp); |
| 1785 | else |
| 1786 | fc_frame_free(fp); |
| 1787 | break; |
| 1788 | case FC_RCTL_BA_ABTS: |
Hannes Reinecke | b73aa56 | 2016-10-13 15:10:49 +0200 | [diff] [blame^] | 1789 | if (ep) |
| 1790 | fc_exch_recv_abts(ep, fp); |
| 1791 | else |
| 1792 | fc_frame_free(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1793 | break; |
| 1794 | default: /* ignore junk */ |
| 1795 | fc_frame_free(fp); |
| 1796 | break; |
| 1797 | } |
| 1798 | } |
| 1799 | if (ep) |
| 1800 | fc_exch_release(ep); /* release hold taken by fc_exch_find */ |
| 1801 | } |
| 1802 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1803 | /** |
| 1804 | * fc_seq_ls_acc() - Accept sequence with LS_ACC |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1805 | * @rx_fp: The received frame, not freed here. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1806 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1807 | * If this fails due to allocation or transmit congestion, assume the |
| 1808 | * originator will repeat the sequence. |
| 1809 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1810 | static void fc_seq_ls_acc(struct fc_frame *rx_fp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1811 | { |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1812 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1813 | struct fc_els_ls_acc *acc; |
| 1814 | struct fc_frame *fp; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1815 | struct fc_seq *sp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1816 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1817 | lport = fr_dev(rx_fp); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1818 | sp = fr_seq(rx_fp); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1819 | fp = fc_frame_alloc(lport, sizeof(*acc)); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1820 | if (!fp) { |
| 1821 | FC_EXCH_DBG(fc_seq_exch(sp), |
| 1822 | "exch: drop LS_ACC, out of memory\n"); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1823 | return; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1824 | } |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1825 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
| 1826 | memset(acc, 0, sizeof(*acc)); |
| 1827 | acc->la_cmd = ELS_LS_ACC; |
| 1828 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); |
| 1829 | lport->tt.frame_send(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1830 | } |
| 1831 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1832 | /** |
| 1833 | * fc_seq_ls_rjt() - Reject a sequence with ELS LS_RJT |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1834 | * @rx_fp: The received frame, not freed here. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1835 | * @reason: The reason the sequence is being rejected |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1836 | * @explan: The explanation for the rejection |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1837 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1838 | * If this fails due to allocation or transmit congestion, assume the |
| 1839 | * originator will repeat the sequence. |
| 1840 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1841 | static void fc_seq_ls_rjt(struct fc_frame *rx_fp, enum fc_els_rjt_reason reason, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1842 | enum fc_els_rjt_explan explan) |
| 1843 | { |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1844 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1845 | struct fc_els_ls_rjt *rjt; |
| 1846 | struct fc_frame *fp; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1847 | struct fc_seq *sp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1848 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1849 | lport = fr_dev(rx_fp); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1850 | sp = fr_seq(rx_fp); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1851 | fp = fc_frame_alloc(lport, sizeof(*rjt)); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1852 | if (!fp) { |
| 1853 | FC_EXCH_DBG(fc_seq_exch(sp), |
| 1854 | "exch: drop LS_ACC, out of memory\n"); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1855 | return; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 1856 | } |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1857 | rjt = fc_frame_payload_get(fp, sizeof(*rjt)); |
| 1858 | memset(rjt, 0, sizeof(*rjt)); |
| 1859 | rjt->er_cmd = ELS_LS_RJT; |
| 1860 | rjt->er_reason = reason; |
| 1861 | rjt->er_explan = explan; |
| 1862 | fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_ELS_REP, 0); |
| 1863 | lport->tt.frame_send(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1864 | } |
| 1865 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1866 | /** |
| 1867 | * fc_exch_reset() - Reset an exchange |
| 1868 | * @ep: The exchange to be reset |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1869 | * |
| 1870 | * Note: May sleep if invoked from outside a response handler. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1871 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1872 | static void fc_exch_reset(struct fc_exch *ep) |
| 1873 | { |
| 1874 | struct fc_seq *sp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1875 | int rc = 1; |
| 1876 | |
| 1877 | spin_lock_bh(&ep->ex_lock); |
| 1878 | ep->state |= FC_EX_RST_CLEANUP; |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 1879 | fc_exch_timer_cancel(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1880 | if (ep->esb_stat & ESB_ST_REC_QUAL) |
| 1881 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */ |
| 1882 | ep->esb_stat &= ~ESB_ST_REC_QUAL; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1883 | sp = &ep->seq; |
| 1884 | rc = fc_exch_done_locked(ep); |
| 1885 | spin_unlock_bh(&ep->ex_lock); |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1886 | |
| 1887 | fc_exch_hold(ep); |
| 1888 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1889 | if (!rc) |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1890 | fc_exch_delete(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1891 | |
Bart Van Assche | 7030fd6 | 2013-08-17 20:34:43 +0000 | [diff] [blame] | 1892 | fc_invoke_resp(ep, sp, ERR_PTR(-FC_EX_CLOSED)); |
| 1893 | fc_seq_set_resp(sp, NULL, ep->arg); |
| 1894 | fc_exch_release(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1895 | } |
| 1896 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1897 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1898 | * fc_exch_pool_reset() - Reset a per cpu exchange pool |
| 1899 | * @lport: The local port that the exchange pool is on |
| 1900 | * @pool: The exchange pool to be reset |
| 1901 | * @sid: The source ID |
| 1902 | * @did: The destination ID |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1903 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1904 | * Resets a per cpu exches pool, releasing all of its sequences |
| 1905 | * and exchanges. If sid is non-zero then reset only exchanges |
| 1906 | * we sourced from the local port's FID. If did is non-zero then |
| 1907 | * only reset exchanges destined for the local port's FID. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1908 | */ |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1909 | static void fc_exch_pool_reset(struct fc_lport *lport, |
| 1910 | struct fc_exch_pool *pool, |
| 1911 | u32 sid, u32 did) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1912 | { |
| 1913 | struct fc_exch *ep; |
| 1914 | struct fc_exch *next; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1915 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1916 | spin_lock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1917 | restart: |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1918 | list_for_each_entry_safe(ep, next, &pool->ex_list, ex_list) { |
| 1919 | if ((lport == ep->lp) && |
| 1920 | (sid == 0 || sid == ep->sid) && |
| 1921 | (did == 0 || did == ep->did)) { |
| 1922 | fc_exch_hold(ep); |
| 1923 | spin_unlock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1924 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1925 | fc_exch_reset(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1926 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1927 | fc_exch_release(ep); |
| 1928 | spin_lock_bh(&pool->lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1929 | |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1930 | /* |
| 1931 | * must restart loop incase while lock |
| 1932 | * was down multiple eps were released. |
| 1933 | */ |
| 1934 | goto restart; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1935 | } |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1936 | } |
Vasu Dev | b6e3c84 | 2011-10-28 11:34:17 -0700 | [diff] [blame] | 1937 | pool->next_index = 0; |
| 1938 | pool->left = FC_XID_UNKNOWN; |
| 1939 | pool->right = FC_XID_UNKNOWN; |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1940 | spin_unlock_bh(&pool->lock); |
| 1941 | } |
| 1942 | |
| 1943 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1944 | * fc_exch_mgr_reset() - Reset all EMs of a local port |
| 1945 | * @lport: The local port whose EMs are to be reset |
| 1946 | * @sid: The source ID |
| 1947 | * @did: The destination ID |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1948 | * |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1949 | * Reset all EMs associated with a given local port. Release all |
| 1950 | * sequences and exchanges. If sid is non-zero then reset only the |
| 1951 | * exchanges sent from the local port's FID. If did is non-zero then |
| 1952 | * reset only exchanges destined for the local port's FID. |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 1953 | */ |
| 1954 | void fc_exch_mgr_reset(struct fc_lport *lport, u32 sid, u32 did) |
| 1955 | { |
| 1956 | struct fc_exch_mgr_anchor *ema; |
| 1957 | unsigned int cpu; |
| 1958 | |
| 1959 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
| 1960 | for_each_possible_cpu(cpu) |
| 1961 | fc_exch_pool_reset(lport, |
| 1962 | per_cpu_ptr(ema->mp->pool, cpu), |
| 1963 | sid, did); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1964 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1965 | } |
| 1966 | EXPORT_SYMBOL(fc_exch_mgr_reset); |
| 1967 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1968 | /** |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1969 | * fc_exch_lookup() - find an exchange |
| 1970 | * @lport: The local port |
| 1971 | * @xid: The exchange ID |
| 1972 | * |
| 1973 | * Returns exchange pointer with hold for caller, or NULL if not found. |
| 1974 | */ |
| 1975 | static struct fc_exch *fc_exch_lookup(struct fc_lport *lport, u32 xid) |
| 1976 | { |
| 1977 | struct fc_exch_mgr_anchor *ema; |
| 1978 | |
| 1979 | list_for_each_entry(ema, &lport->ema_list, ema_list) |
| 1980 | if (ema->mp->min_xid <= xid && xid <= ema->mp->max_xid) |
| 1981 | return fc_exch_find(ema->mp, xid); |
| 1982 | return NULL; |
| 1983 | } |
| 1984 | |
| 1985 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1986 | * fc_exch_els_rec() - Handler for ELS REC (Read Exchange Concise) requests |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1987 | * @rfp: The REC frame, not freed here. |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 1988 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1989 | * Note that the requesting port may be different than the S_ID in the request. |
| 1990 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1991 | static void fc_exch_els_rec(struct fc_frame *rfp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1992 | { |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 1993 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1994 | struct fc_frame *fp; |
| 1995 | struct fc_exch *ep; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 1996 | struct fc_els_rec *rp; |
| 1997 | struct fc_els_rec_acc *acc; |
| 1998 | enum fc_els_rjt_reason reason = ELS_RJT_LOGIC; |
| 1999 | enum fc_els_rjt_explan explan; |
| 2000 | u32 sid; |
| 2001 | u16 rxid; |
| 2002 | u16 oxid; |
| 2003 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2004 | lport = fr_dev(rfp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2005 | rp = fc_frame_payload_get(rfp, sizeof(*rp)); |
| 2006 | explan = ELS_EXPL_INV_LEN; |
| 2007 | if (!rp) |
| 2008 | goto reject; |
| 2009 | sid = ntoh24(rp->rec_s_id); |
| 2010 | rxid = ntohs(rp->rec_rx_id); |
| 2011 | oxid = ntohs(rp->rec_ox_id); |
| 2012 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2013 | ep = fc_exch_lookup(lport, |
| 2014 | sid == fc_host_port_id(lport->host) ? oxid : rxid); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2015 | explan = ELS_EXPL_OXID_RXID; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2016 | if (!ep) { |
| 2017 | FC_LPORT_DBG(lport, |
| 2018 | "REC request from %x: rxid %x oxid %x not found\n", |
| 2019 | sid, rxid, oxid); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2020 | goto reject; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2021 | } |
| 2022 | FC_EXCH_DBG(ep, "REC request from %x: rxid %x oxid %x\n", |
| 2023 | sid, rxid, oxid); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2024 | if (ep->oid != sid || oxid != ep->oxid) |
| 2025 | goto rel; |
| 2026 | if (rxid != FC_XID_UNKNOWN && rxid != ep->rxid) |
| 2027 | goto rel; |
| 2028 | fp = fc_frame_alloc(lport, sizeof(*acc)); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2029 | if (!fp) { |
| 2030 | FC_EXCH_DBG(ep, "Drop REC request, out of memory\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2031 | goto out; |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2032 | } |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2033 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2034 | acc = fc_frame_payload_get(fp, sizeof(*acc)); |
| 2035 | memset(acc, 0, sizeof(*acc)); |
| 2036 | acc->reca_cmd = ELS_LS_ACC; |
| 2037 | acc->reca_ox_id = rp->rec_ox_id; |
| 2038 | memcpy(acc->reca_ofid, rp->rec_s_id, 3); |
| 2039 | acc->reca_rx_id = htons(ep->rxid); |
| 2040 | if (ep->sid == ep->oid) |
| 2041 | hton24(acc->reca_rfid, ep->did); |
| 2042 | else |
| 2043 | hton24(acc->reca_rfid, ep->sid); |
| 2044 | acc->reca_fc4value = htonl(ep->seq.rec_data); |
| 2045 | acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP | |
| 2046 | ESB_ST_SEQ_INIT | |
| 2047 | ESB_ST_COMPLETE)); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2048 | fc_fill_reply_hdr(fp, rfp, FC_RCTL_ELS_REP, 0); |
| 2049 | lport->tt.frame_send(lport, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2050 | out: |
| 2051 | fc_exch_release(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2052 | return; |
| 2053 | |
| 2054 | rel: |
| 2055 | fc_exch_release(ep); |
| 2056 | reject: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2057 | fc_seq_ls_rjt(rfp, reason, explan); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2058 | } |
| 2059 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2060 | /** |
| 2061 | * fc_exch_rrq_resp() - Handler for RRQ responses |
| 2062 | * @sp: The sequence that the RRQ is on |
| 2063 | * @fp: The RRQ frame |
| 2064 | * @arg: The exchange that the RRQ is on |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2065 | * |
| 2066 | * TODO: fix error handler. |
| 2067 | */ |
| 2068 | static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg) |
| 2069 | { |
| 2070 | struct fc_exch *aborted_ep = arg; |
| 2071 | unsigned int op; |
| 2072 | |
| 2073 | if (IS_ERR(fp)) { |
| 2074 | int err = PTR_ERR(fp); |
| 2075 | |
Vasu Dev | 78342da | 2009-02-27 10:54:46 -0800 | [diff] [blame] | 2076 | if (err == -FC_EX_CLOSED || err == -FC_EX_TIMEOUT) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2077 | goto cleanup; |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2078 | FC_EXCH_DBG(aborted_ep, "Cannot process RRQ, " |
| 2079 | "frame error %d\n", err); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2080 | return; |
| 2081 | } |
| 2082 | |
| 2083 | op = fc_frame_payload_op(fp); |
| 2084 | fc_frame_free(fp); |
| 2085 | |
| 2086 | switch (op) { |
| 2087 | case ELS_LS_RJT: |
Bart Van Assche | b20d9bf | 2013-08-14 15:32:51 +0000 | [diff] [blame] | 2088 | FC_EXCH_DBG(aborted_ep, "LS_RJT for RRQ\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2089 | /* fall through */ |
| 2090 | case ELS_LS_ACC: |
| 2091 | goto cleanup; |
| 2092 | default: |
Bart Van Assche | b20d9bf | 2013-08-14 15:32:51 +0000 | [diff] [blame] | 2093 | FC_EXCH_DBG(aborted_ep, "unexpected response op %x for RRQ\n", |
| 2094 | op); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2095 | return; |
| 2096 | } |
| 2097 | |
| 2098 | cleanup: |
| 2099 | fc_exch_done(&aborted_ep->seq); |
| 2100 | /* drop hold for rec qual */ |
| 2101 | fc_exch_release(aborted_ep); |
| 2102 | } |
| 2103 | |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2104 | |
| 2105 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2106 | * fc_exch_seq_send() - Send a frame using a new exchange and sequence |
| 2107 | * @lport: The local port to send the frame on |
| 2108 | * @fp: The frame to be sent |
| 2109 | * @resp: The response handler for this request |
| 2110 | * @destructor: The destructor for the exchange |
| 2111 | * @arg: The argument to be passed to the response handler |
| 2112 | * @timer_msec: The timeout period for the exchange |
| 2113 | * |
| 2114 | * The frame pointer with some of the header's fields must be |
| 2115 | * filled before calling this routine, those fields are: |
| 2116 | * |
| 2117 | * - routing control |
| 2118 | * - FC port did |
| 2119 | * - FC port sid |
| 2120 | * - FC header type |
| 2121 | * - frame control |
| 2122 | * - parameter or relative offset |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2123 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2124 | static struct fc_seq *fc_exch_seq_send(struct fc_lport *lport, |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2125 | struct fc_frame *fp, |
| 2126 | void (*resp)(struct fc_seq *, |
| 2127 | struct fc_frame *fp, |
| 2128 | void *arg), |
| 2129 | void (*destructor)(struct fc_seq *, |
| 2130 | void *), |
| 2131 | void *arg, u32 timer_msec) |
| 2132 | { |
| 2133 | struct fc_exch *ep; |
| 2134 | struct fc_seq *sp = NULL; |
| 2135 | struct fc_frame_header *fh; |
Yi Zou | 3ee17f5 | 2011-08-25 12:41:03 -0700 | [diff] [blame] | 2136 | struct fc_fcp_pkt *fsp = NULL; |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2137 | int rc = 1; |
| 2138 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2139 | ep = fc_exch_alloc(lport, fp); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2140 | if (!ep) { |
| 2141 | fc_frame_free(fp); |
| 2142 | return NULL; |
| 2143 | } |
| 2144 | ep->esb_stat |= ESB_ST_SEQ_INIT; |
| 2145 | fh = fc_frame_header_get(fp); |
| 2146 | fc_exch_set_addr(ep, ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id)); |
| 2147 | ep->resp = resp; |
| 2148 | ep->destructor = destructor; |
| 2149 | ep->arg = arg; |
Hannes Reinecke | f7ce413 | 2016-10-13 15:10:39 +0200 | [diff] [blame] | 2150 | ep->r_a_tov = lport->r_a_tov; |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2151 | ep->lp = lport; |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2152 | sp = &ep->seq; |
| 2153 | |
| 2154 | ep->fh_type = fh->fh_type; /* save for possbile timeout handling */ |
| 2155 | ep->f_ctl = ntoh24(fh->fh_f_ctl); |
| 2156 | fc_exch_setup_hdr(ep, fp, ep->f_ctl); |
| 2157 | sp->cnt++; |
| 2158 | |
Yi Zou | 3ee17f5 | 2011-08-25 12:41:03 -0700 | [diff] [blame] | 2159 | if (ep->xid <= lport->lro_xid && fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
| 2160 | fsp = fr_fsp(fp); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2161 | fc_fcp_ddp_setup(fr_fsp(fp), ep->xid); |
Yi Zou | 3ee17f5 | 2011-08-25 12:41:03 -0700 | [diff] [blame] | 2162 | } |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2163 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2164 | if (unlikely(lport->tt.frame_send(lport, fp))) |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2165 | goto err; |
| 2166 | |
| 2167 | if (timer_msec) |
| 2168 | fc_exch_timer_set_locked(ep, timer_msec); |
| 2169 | ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */ |
| 2170 | |
| 2171 | if (ep->f_ctl & FC_FC_SEQ_INIT) |
| 2172 | ep->esb_stat &= ~ESB_ST_SEQ_INIT; |
| 2173 | spin_unlock_bh(&ep->ex_lock); |
| 2174 | return sp; |
| 2175 | err: |
Yi Zou | 3ee17f5 | 2011-08-25 12:41:03 -0700 | [diff] [blame] | 2176 | if (fsp) |
| 2177 | fc_fcp_ddp_done(fsp); |
Robert Love | 1a7b75a | 2009-11-03 11:45:47 -0800 | [diff] [blame] | 2178 | rc = fc_exch_done_locked(ep); |
| 2179 | spin_unlock_bh(&ep->ex_lock); |
| 2180 | if (!rc) |
| 2181 | fc_exch_delete(ep); |
| 2182 | return NULL; |
| 2183 | } |
| 2184 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2185 | /** |
| 2186 | * fc_exch_rrq() - Send an ELS RRQ (Reinstate Recovery Qualifier) command |
| 2187 | * @ep: The exchange to send the RRQ on |
| 2188 | * |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2189 | * This tells the remote port to stop blocking the use of |
| 2190 | * the exchange and the seq_cnt range. |
| 2191 | */ |
| 2192 | static void fc_exch_rrq(struct fc_exch *ep) |
| 2193 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2194 | struct fc_lport *lport; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2195 | struct fc_els_rrq *rrq; |
| 2196 | struct fc_frame *fp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2197 | u32 did; |
| 2198 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2199 | lport = ep->lp; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2200 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2201 | fp = fc_frame_alloc(lport, sizeof(*rrq)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2202 | if (!fp) |
Vasu Dev | a0cc1ec | 2009-07-28 17:33:37 -0700 | [diff] [blame] | 2203 | goto retry; |
| 2204 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2205 | rrq = fc_frame_payload_get(fp, sizeof(*rrq)); |
| 2206 | memset(rrq, 0, sizeof(*rrq)); |
| 2207 | rrq->rrq_cmd = ELS_RRQ; |
| 2208 | hton24(rrq->rrq_s_id, ep->sid); |
| 2209 | rrq->rrq_ox_id = htons(ep->oxid); |
| 2210 | rrq->rrq_rx_id = htons(ep->rxid); |
| 2211 | |
| 2212 | did = ep->did; |
| 2213 | if (ep->esb_stat & ESB_ST_RESP) |
| 2214 | did = ep->sid; |
| 2215 | |
| 2216 | fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, did, |
Robert Love | 7b2787e | 2010-05-07 15:18:41 -0700 | [diff] [blame] | 2217 | lport->port_id, FC_TYPE_ELS, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2218 | FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); |
| 2219 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2220 | if (fc_exch_seq_send(lport, fp, fc_exch_rrq_resp, NULL, ep, |
| 2221 | lport->e_d_tov)) |
Vasu Dev | a0cc1ec | 2009-07-28 17:33:37 -0700 | [diff] [blame] | 2222 | return; |
| 2223 | |
| 2224 | retry: |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2225 | FC_EXCH_DBG(ep, "exch: RRQ send failed\n"); |
Vasu Dev | a0cc1ec | 2009-07-28 17:33:37 -0700 | [diff] [blame] | 2226 | spin_lock_bh(&ep->ex_lock); |
| 2227 | if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE)) { |
| 2228 | spin_unlock_bh(&ep->ex_lock); |
| 2229 | /* drop hold for rec qual */ |
| 2230 | fc_exch_release(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2231 | return; |
| 2232 | } |
Vasu Dev | a0cc1ec | 2009-07-28 17:33:37 -0700 | [diff] [blame] | 2233 | ep->esb_stat |= ESB_ST_REC_QUAL; |
| 2234 | fc_exch_timer_set_locked(ep, ep->r_a_tov); |
| 2235 | spin_unlock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2236 | } |
| 2237 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2238 | /** |
| 2239 | * fc_exch_els_rrq() - Handler for ELS RRQ (Reset Recovery Qualifier) requests |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2240 | * @fp: The RRQ frame, not freed here. |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2241 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2242 | static void fc_exch_els_rrq(struct fc_frame *fp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2243 | { |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2244 | struct fc_lport *lport; |
Vasu Dev | 3f127ad | 2009-10-21 16:27:33 -0700 | [diff] [blame] | 2245 | struct fc_exch *ep = NULL; /* request or subject exchange */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2246 | struct fc_els_rrq *rp; |
| 2247 | u32 sid; |
| 2248 | u16 xid; |
| 2249 | enum fc_els_rjt_explan explan; |
| 2250 | |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2251 | lport = fr_dev(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2252 | rp = fc_frame_payload_get(fp, sizeof(*rp)); |
| 2253 | explan = ELS_EXPL_INV_LEN; |
| 2254 | if (!rp) |
| 2255 | goto reject; |
| 2256 | |
| 2257 | /* |
| 2258 | * lookup subject exchange. |
| 2259 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2260 | sid = ntoh24(rp->rrq_s_id); /* subject source */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2261 | xid = fc_host_port_id(lport->host) == sid ? |
| 2262 | ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id); |
| 2263 | ep = fc_exch_lookup(lport, xid); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2264 | explan = ELS_EXPL_OXID_RXID; |
| 2265 | if (!ep) |
| 2266 | goto reject; |
| 2267 | spin_lock_bh(&ep->ex_lock); |
Hannes Reinecke | 57d3ec7e | 2016-10-13 15:10:37 +0200 | [diff] [blame] | 2268 | FC_EXCH_DBG(ep, "RRQ request from %x: xid %x rxid %x oxid %x\n", |
| 2269 | sid, xid, ntohs(rp->rrq_rx_id), ntohs(rp->rrq_ox_id)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2270 | if (ep->oxid != ntohs(rp->rrq_ox_id)) |
| 2271 | goto unlock_reject; |
| 2272 | if (ep->rxid != ntohs(rp->rrq_rx_id) && |
| 2273 | ep->rxid != FC_XID_UNKNOWN) |
| 2274 | goto unlock_reject; |
| 2275 | explan = ELS_EXPL_SID; |
| 2276 | if (ep->sid != sid) |
| 2277 | goto unlock_reject; |
| 2278 | |
| 2279 | /* |
| 2280 | * Clear Recovery Qualifier state, and cancel timer if complete. |
| 2281 | */ |
| 2282 | if (ep->esb_stat & ESB_ST_REC_QUAL) { |
| 2283 | ep->esb_stat &= ~ESB_ST_REC_QUAL; |
| 2284 | atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */ |
| 2285 | } |
Vasu Dev | b29a4f3 | 2012-07-06 10:40:10 -0700 | [diff] [blame] | 2286 | if (ep->esb_stat & ESB_ST_COMPLETE) |
| 2287 | fc_exch_timer_cancel(ep); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2288 | |
| 2289 | spin_unlock_bh(&ep->ex_lock); |
| 2290 | |
| 2291 | /* |
| 2292 | * Send LS_ACC. |
| 2293 | */ |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2294 | fc_seq_ls_acc(fp); |
Vasu Dev | 3f127ad | 2009-10-21 16:27:33 -0700 | [diff] [blame] | 2295 | goto out; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2296 | |
| 2297 | unlock_reject: |
| 2298 | spin_unlock_bh(&ep->ex_lock); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2299 | reject: |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2300 | fc_seq_ls_rjt(fp, ELS_RJT_LOGIC, explan); |
Vasu Dev | 3f127ad | 2009-10-21 16:27:33 -0700 | [diff] [blame] | 2301 | out: |
Vasu Dev | 3f127ad | 2009-10-21 16:27:33 -0700 | [diff] [blame] | 2302 | if (ep) |
| 2303 | fc_exch_release(ep); /* drop hold from fc_exch_find */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2304 | } |
| 2305 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2306 | /** |
Vasu Dev | 4e5fae7 | 2012-05-25 10:26:54 -0700 | [diff] [blame] | 2307 | * fc_exch_update_stats() - update exches stats to lport |
| 2308 | * @lport: The local port to update exchange manager stats |
| 2309 | */ |
| 2310 | void fc_exch_update_stats(struct fc_lport *lport) |
| 2311 | { |
| 2312 | struct fc_host_statistics *st; |
| 2313 | struct fc_exch_mgr_anchor *ema; |
| 2314 | struct fc_exch_mgr *mp; |
| 2315 | |
| 2316 | st = &lport->host_stats; |
| 2317 | |
| 2318 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
| 2319 | mp = ema->mp; |
| 2320 | st->fc_no_free_exch += atomic_read(&mp->stats.no_free_exch); |
| 2321 | st->fc_no_free_exch_xid += |
| 2322 | atomic_read(&mp->stats.no_free_exch_xid); |
| 2323 | st->fc_xid_not_found += atomic_read(&mp->stats.xid_not_found); |
| 2324 | st->fc_xid_busy += atomic_read(&mp->stats.xid_busy); |
| 2325 | st->fc_seq_not_found += atomic_read(&mp->stats.seq_not_found); |
| 2326 | st->fc_non_bls_resp += atomic_read(&mp->stats.non_bls_resp); |
| 2327 | } |
| 2328 | } |
| 2329 | EXPORT_SYMBOL(fc_exch_update_stats); |
| 2330 | |
| 2331 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2332 | * fc_exch_mgr_add() - Add an exchange manager to a local port's list of EMs |
| 2333 | * @lport: The local port to add the exchange manager to |
| 2334 | * @mp: The exchange manager to be added to the local port |
| 2335 | * @match: The match routine that indicates when this EM should be used |
| 2336 | */ |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 2337 | struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport, |
| 2338 | struct fc_exch_mgr *mp, |
| 2339 | bool (*match)(struct fc_frame *)) |
| 2340 | { |
| 2341 | struct fc_exch_mgr_anchor *ema; |
| 2342 | |
| 2343 | ema = kmalloc(sizeof(*ema), GFP_ATOMIC); |
| 2344 | if (!ema) |
| 2345 | return ema; |
| 2346 | |
| 2347 | ema->mp = mp; |
| 2348 | ema->match = match; |
| 2349 | /* add EM anchor to EM anchors list */ |
| 2350 | list_add_tail(&ema->ema_list, &lport->ema_list); |
| 2351 | kref_get(&mp->kref); |
| 2352 | return ema; |
| 2353 | } |
| 2354 | EXPORT_SYMBOL(fc_exch_mgr_add); |
| 2355 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2356 | /** |
| 2357 | * fc_exch_mgr_destroy() - Destroy an exchange manager |
| 2358 | * @kref: The reference to the EM to be destroyed |
| 2359 | */ |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 2360 | static void fc_exch_mgr_destroy(struct kref *kref) |
| 2361 | { |
| 2362 | struct fc_exch_mgr *mp = container_of(kref, struct fc_exch_mgr, kref); |
| 2363 | |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 2364 | mempool_destroy(mp->ep_pool); |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2365 | free_percpu(mp->pool); |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 2366 | kfree(mp); |
| 2367 | } |
| 2368 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2369 | /** |
| 2370 | * fc_exch_mgr_del() - Delete an EM from a local port's list |
| 2371 | * @ema: The exchange manager anchor identifying the EM to be deleted |
| 2372 | */ |
Vasu Dev | 9631609 | 2009-07-29 17:05:00 -0700 | [diff] [blame] | 2373 | void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) |
| 2374 | { |
| 2375 | /* remove EM anchor from EM anchors list */ |
| 2376 | list_del(&ema->ema_list); |
| 2377 | kref_put(&ema->mp->kref, fc_exch_mgr_destroy); |
| 2378 | kfree(ema); |
| 2379 | } |
| 2380 | EXPORT_SYMBOL(fc_exch_mgr_del); |
| 2381 | |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 2382 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2383 | * fc_exch_mgr_list_clone() - Share all exchange manager objects |
| 2384 | * @src: Source lport to clone exchange managers from |
| 2385 | * @dst: New lport that takes references to all the exchange managers |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 2386 | */ |
| 2387 | int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst) |
| 2388 | { |
| 2389 | struct fc_exch_mgr_anchor *ema, *tmp; |
| 2390 | |
| 2391 | list_for_each_entry(ema, &src->ema_list, ema_list) { |
| 2392 | if (!fc_exch_mgr_add(dst, ema->mp, ema->match)) |
| 2393 | goto err; |
| 2394 | } |
| 2395 | return 0; |
| 2396 | err: |
| 2397 | list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list) |
| 2398 | fc_exch_mgr_del(ema); |
| 2399 | return -ENOMEM; |
| 2400 | } |
Vasu Dev | 72fa396 | 2011-02-25 15:03:01 -0800 | [diff] [blame] | 2401 | EXPORT_SYMBOL(fc_exch_mgr_list_clone); |
Chris Leech | 174e1eb | 2009-11-03 11:46:14 -0800 | [diff] [blame] | 2402 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2403 | /** |
| 2404 | * fc_exch_mgr_alloc() - Allocate an exchange manager |
| 2405 | * @lport: The local port that the new EM will be associated with |
| 2406 | * @class: The default FC class for new exchanges |
| 2407 | * @min_xid: The minimum XID for exchanges from the new EM |
| 2408 | * @max_xid: The maximum XID for exchanges from the new EM |
| 2409 | * @match: The match routine for the new EM |
| 2410 | */ |
| 2411 | struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lport, |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2412 | enum fc_class class, |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2413 | u16 min_xid, u16 max_xid, |
| 2414 | bool (*match)(struct fc_frame *)) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2415 | { |
| 2416 | struct fc_exch_mgr *mp; |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2417 | u16 pool_exch_range; |
| 2418 | size_t pool_size; |
| 2419 | unsigned int cpu; |
| 2420 | struct fc_exch_pool *pool; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2421 | |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2422 | if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN || |
| 2423 | (min_xid & fc_cpu_mask) != 0) { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2424 | FC_LPORT_DBG(lport, "Invalid min_xid 0x:%x and max_xid 0x:%x\n", |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2425 | min_xid, max_xid); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2426 | return NULL; |
| 2427 | } |
| 2428 | |
| 2429 | /* |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 2430 | * allocate memory for EM |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2431 | */ |
Vasu Dev | b2f0091 | 2009-08-25 13:58:53 -0700 | [diff] [blame] | 2432 | mp = kzalloc(sizeof(struct fc_exch_mgr), GFP_ATOMIC); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2433 | if (!mp) |
| 2434 | return NULL; |
| 2435 | |
| 2436 | mp->class = class; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2437 | /* adjust em exch xid range for offload */ |
| 2438 | mp->min_xid = min_xid; |
Steven Clark | 011a900 | 2012-03-09 14:50:30 -0800 | [diff] [blame] | 2439 | |
| 2440 | /* reduce range so per cpu pool fits into PCPU_MIN_UNIT_SIZE pool */ |
| 2441 | pool_exch_range = (PCPU_MIN_UNIT_SIZE - sizeof(*pool)) / |
| 2442 | sizeof(struct fc_exch *); |
| 2443 | if ((max_xid - min_xid + 1) / (fc_cpu_mask + 1) > pool_exch_range) { |
| 2444 | mp->max_xid = pool_exch_range * (fc_cpu_mask + 1) + |
| 2445 | min_xid - 1; |
| 2446 | } else { |
| 2447 | mp->max_xid = max_xid; |
| 2448 | pool_exch_range = (mp->max_xid - mp->min_xid + 1) / |
| 2449 | (fc_cpu_mask + 1); |
| 2450 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2451 | |
| 2452 | mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep); |
| 2453 | if (!mp->ep_pool) |
| 2454 | goto free_mp; |
| 2455 | |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2456 | /* |
| 2457 | * Setup per cpu exch pool with entire exchange id range equally |
| 2458 | * divided across all cpus. The exch pointers array memory is |
| 2459 | * allocated for exch range per pool. |
| 2460 | */ |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2461 | mp->pool_max_index = pool_exch_range - 1; |
| 2462 | |
| 2463 | /* |
| 2464 | * Allocate and initialize per cpu exch pool |
| 2465 | */ |
| 2466 | pool_size = sizeof(*pool) + pool_exch_range * sizeof(struct fc_exch *); |
| 2467 | mp->pool = __alloc_percpu(pool_size, __alignof__(struct fc_exch_pool)); |
| 2468 | if (!mp->pool) |
| 2469 | goto free_mempool; |
| 2470 | for_each_possible_cpu(cpu) { |
| 2471 | pool = per_cpu_ptr(mp->pool, cpu); |
Vasu Dev | b6e3c84 | 2011-10-28 11:34:17 -0700 | [diff] [blame] | 2472 | pool->next_index = 0; |
Hillf Danton | 2034c19 | 2010-11-30 16:18:17 -0800 | [diff] [blame] | 2473 | pool->left = FC_XID_UNKNOWN; |
| 2474 | pool->right = FC_XID_UNKNOWN; |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2475 | spin_lock_init(&pool->lock); |
| 2476 | INIT_LIST_HEAD(&pool->ex_list); |
| 2477 | } |
| 2478 | |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2479 | kref_init(&mp->kref); |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2480 | if (!fc_exch_mgr_add(lport, mp, match)) { |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2481 | free_percpu(mp->pool); |
| 2482 | goto free_mempool; |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2483 | } |
| 2484 | |
| 2485 | /* |
| 2486 | * Above kref_init() sets mp->kref to 1 and then |
| 2487 | * call to fc_exch_mgr_add incremented mp->kref again, |
| 2488 | * so adjust that extra increment. |
| 2489 | */ |
| 2490 | kref_put(&mp->kref, fc_exch_mgr_destroy); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2491 | return mp; |
| 2492 | |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2493 | free_mempool: |
| 2494 | mempool_destroy(mp->ep_pool); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2495 | free_mp: |
| 2496 | kfree(mp); |
| 2497 | return NULL; |
| 2498 | } |
| 2499 | EXPORT_SYMBOL(fc_exch_mgr_alloc); |
| 2500 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2501 | /** |
| 2502 | * fc_exch_mgr_free() - Free all exchange managers on a local port |
| 2503 | * @lport: The local port whose EMs are to be freed |
| 2504 | */ |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2505 | void fc_exch_mgr_free(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2506 | { |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2507 | struct fc_exch_mgr_anchor *ema, *next; |
| 2508 | |
Vasu Dev | 4ae1e19 | 2009-11-03 11:50:10 -0800 | [diff] [blame] | 2509 | flush_workqueue(fc_exch_workqueue); |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2510 | list_for_each_entry_safe(ema, next, &lport->ema_list, ema_list) |
| 2511 | fc_exch_mgr_del(ema); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2512 | } |
| 2513 | EXPORT_SYMBOL(fc_exch_mgr_free); |
| 2514 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2515 | /** |
Kiran Patil | 6c8cc1c | 2011-01-28 16:04:39 -0800 | [diff] [blame] | 2516 | * fc_find_ema() - Lookup and return appropriate Exchange Manager Anchor depending |
| 2517 | * upon 'xid'. |
| 2518 | * @f_ctl: f_ctl |
| 2519 | * @lport: The local port the frame was received on |
| 2520 | * @fh: The received frame header |
| 2521 | */ |
| 2522 | static struct fc_exch_mgr_anchor *fc_find_ema(u32 f_ctl, |
| 2523 | struct fc_lport *lport, |
| 2524 | struct fc_frame_header *fh) |
| 2525 | { |
| 2526 | struct fc_exch_mgr_anchor *ema; |
| 2527 | u16 xid; |
| 2528 | |
| 2529 | if (f_ctl & FC_FC_EX_CTX) |
| 2530 | xid = ntohs(fh->fh_ox_id); |
| 2531 | else { |
| 2532 | xid = ntohs(fh->fh_rx_id); |
| 2533 | if (xid == FC_XID_UNKNOWN) |
| 2534 | return list_entry(lport->ema_list.prev, |
| 2535 | typeof(*ema), ema_list); |
| 2536 | } |
| 2537 | |
| 2538 | list_for_each_entry(ema, &lport->ema_list, ema_list) { |
| 2539 | if ((xid >= ema->mp->min_xid) && |
| 2540 | (xid <= ema->mp->max_xid)) |
| 2541 | return ema; |
| 2542 | } |
| 2543 | return NULL; |
| 2544 | } |
| 2545 | /** |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2546 | * fc_exch_recv() - Handler for received frames |
| 2547 | * @lport: The local port the frame was received on |
Kiran Patil | 6c8cc1c | 2011-01-28 16:04:39 -0800 | [diff] [blame] | 2548 | * @fp: The received frame |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2549 | */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2550 | void fc_exch_recv(struct fc_lport *lport, struct fc_frame *fp) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2551 | { |
| 2552 | struct fc_frame_header *fh = fc_frame_header_get(fp); |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2553 | struct fc_exch_mgr_anchor *ema; |
Kiran Patil | 6c8cc1c | 2011-01-28 16:04:39 -0800 | [diff] [blame] | 2554 | u32 f_ctl; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2555 | |
| 2556 | /* lport lock ? */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2557 | if (!lport || lport->state == LPORT_ST_DISABLED) { |
| 2558 | FC_LPORT_DBG(lport, "Receiving frames for an lport that " |
Robert Love | 7414705 | 2009-06-10 15:31:10 -0700 | [diff] [blame] | 2559 | "has not been initialized correctly\n"); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2560 | fc_frame_free(fp); |
| 2561 | return; |
| 2562 | } |
| 2563 | |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2564 | f_ctl = ntoh24(fh->fh_f_ctl); |
Kiran Patil | 6c8cc1c | 2011-01-28 16:04:39 -0800 | [diff] [blame] | 2565 | ema = fc_find_ema(f_ctl, lport, fh); |
| 2566 | if (!ema) { |
| 2567 | FC_LPORT_DBG(lport, "Unable to find Exchange Manager Anchor," |
| 2568 | "fc_ctl <0x%x>, xid <0x%x>\n", |
| 2569 | f_ctl, |
| 2570 | (f_ctl & FC_FC_EX_CTX) ? |
| 2571 | ntohs(fh->fh_ox_id) : |
| 2572 | ntohs(fh->fh_rx_id)); |
| 2573 | fc_frame_free(fp); |
| 2574 | return; |
| 2575 | } |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2576 | |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2577 | /* |
| 2578 | * If frame is marked invalid, just drop it. |
| 2579 | */ |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2580 | switch (fr_eof(fp)) { |
| 2581 | case FC_EOF_T: |
| 2582 | if (f_ctl & FC_FC_END_SEQ) |
| 2583 | skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl)); |
| 2584 | /* fall through */ |
| 2585 | case FC_EOF_N: |
| 2586 | if (fh->fh_type == FC_TYPE_BLS) |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2587 | fc_exch_recv_bls(ema->mp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2588 | else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) == |
| 2589 | FC_FC_EX_CTX) |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2590 | fc_exch_recv_seq_resp(ema->mp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2591 | else if (f_ctl & FC_FC_SEQ_CTX) |
Vasu Dev | 52ff878 | 2009-07-29 17:05:10 -0700 | [diff] [blame] | 2592 | fc_exch_recv_resp(ema->mp, fp); |
Joe Eykholt | 92261156 | 2010-07-20 15:21:12 -0700 | [diff] [blame] | 2593 | else /* no EX_CTX and no SEQ_CTX */ |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2594 | fc_exch_recv_req(lport, ema->mp, fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2595 | break; |
| 2596 | default: |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2597 | FC_LPORT_DBG(lport, "dropping invalid frame (eof %x)", |
| 2598 | fr_eof(fp)); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2599 | fc_frame_free(fp); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2600 | } |
| 2601 | } |
| 2602 | EXPORT_SYMBOL(fc_exch_recv); |
| 2603 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2604 | /** |
| 2605 | * fc_exch_init() - Initialize the exchange layer for a local port |
| 2606 | * @lport: The local port to initialize the exchange layer for |
| 2607 | */ |
| 2608 | int fc_exch_init(struct fc_lport *lport) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2609 | { |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2610 | if (!lport->tt.seq_start_next) |
| 2611 | lport->tt.seq_start_next = fc_seq_start_next; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2612 | |
Joe Eykholt | 1a5c2d7 | 2011-01-28 16:04:08 -0800 | [diff] [blame] | 2613 | if (!lport->tt.seq_set_resp) |
| 2614 | lport->tt.seq_set_resp = fc_seq_set_resp; |
| 2615 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2616 | if (!lport->tt.exch_seq_send) |
| 2617 | lport->tt.exch_seq_send = fc_exch_seq_send; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2618 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2619 | if (!lport->tt.seq_send) |
| 2620 | lport->tt.seq_send = fc_seq_send; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2621 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2622 | if (!lport->tt.seq_els_rsp_send) |
| 2623 | lport->tt.seq_els_rsp_send = fc_seq_els_rsp_send; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2624 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2625 | if (!lport->tt.exch_done) |
| 2626 | lport->tt.exch_done = fc_exch_done; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2627 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2628 | if (!lport->tt.exch_mgr_reset) |
| 2629 | lport->tt.exch_mgr_reset = fc_exch_mgr_reset; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2630 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2631 | if (!lport->tt.seq_exch_abort) |
| 2632 | lport->tt.seq_exch_abort = fc_seq_exch_abort; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2633 | |
Joe Eykholt | 239e810 | 2010-07-20 15:21:07 -0700 | [diff] [blame] | 2634 | if (!lport->tt.seq_assign) |
| 2635 | lport->tt.seq_assign = fc_seq_assign; |
| 2636 | |
Joe Eykholt | 62bdb64 | 2011-01-28 16:04:34 -0800 | [diff] [blame] | 2637 | if (!lport->tt.seq_release) |
| 2638 | lport->tt.seq_release = fc_seq_release; |
| 2639 | |
Vasu Dev | 89f19a5 | 2009-10-21 16:27:28 -0700 | [diff] [blame] | 2640 | return 0; |
| 2641 | } |
| 2642 | EXPORT_SYMBOL(fc_exch_init); |
| 2643 | |
| 2644 | /** |
| 2645 | * fc_setup_exch_mgr() - Setup an exchange manager |
| 2646 | */ |
Randy Dunlap | 5520490 | 2011-01-28 16:03:57 -0800 | [diff] [blame] | 2647 | int fc_setup_exch_mgr(void) |
Vasu Dev | 89f19a5 | 2009-10-21 16:27:28 -0700 | [diff] [blame] | 2648 | { |
| 2649 | fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch), |
| 2650 | 0, SLAB_HWCACHE_ALIGN, NULL); |
| 2651 | if (!fc_em_cachep) |
| 2652 | return -ENOMEM; |
| 2653 | |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2654 | /* |
| 2655 | * Initialize fc_cpu_mask and fc_cpu_order. The |
| 2656 | * fc_cpu_mask is set for nr_cpu_ids rounded up |
| 2657 | * to order of 2's * power and order is stored |
| 2658 | * in fc_cpu_order as this is later required in |
| 2659 | * mapping between an exch id and exch array index |
| 2660 | * in per cpu exch pool. |
| 2661 | * |
| 2662 | * This round up is required to align fc_cpu_mask |
| 2663 | * to exchange id's lower bits such that all incoming |
| 2664 | * frames of an exchange gets delivered to the same |
| 2665 | * cpu on which exchange originated by simple bitwise |
| 2666 | * AND operation between fc_cpu_mask and exchange id. |
| 2667 | */ |
Bart Van Assche | a84ea8c | 2013-08-14 15:33:35 +0000 | [diff] [blame] | 2668 | fc_cpu_order = ilog2(roundup_pow_of_two(nr_cpu_ids)); |
| 2669 | fc_cpu_mask = (1 << fc_cpu_order) - 1; |
Vasu Dev | e4bc50b | 2009-08-25 13:58:47 -0700 | [diff] [blame] | 2670 | |
Vasu Dev | 4ae1e19 | 2009-11-03 11:50:10 -0800 | [diff] [blame] | 2671 | fc_exch_workqueue = create_singlethread_workqueue("fc_exch_workqueue"); |
| 2672 | if (!fc_exch_workqueue) |
Hillf Danton | 6f06e3a | 2011-07-27 15:10:34 -0700 | [diff] [blame] | 2673 | goto err; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2674 | return 0; |
Hillf Danton | 6f06e3a | 2011-07-27 15:10:34 -0700 | [diff] [blame] | 2675 | err: |
| 2676 | kmem_cache_destroy(fc_em_cachep); |
| 2677 | return -ENOMEM; |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2678 | } |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2679 | |
Robert Love | 3a3b42b | 2009-11-03 11:47:39 -0800 | [diff] [blame] | 2680 | /** |
| 2681 | * fc_destroy_exch_mgr() - Destroy an exchange manager |
| 2682 | */ |
Randy Dunlap | 5520490 | 2011-01-28 16:03:57 -0800 | [diff] [blame] | 2683 | void fc_destroy_exch_mgr(void) |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2684 | { |
Vasu Dev | 4ae1e19 | 2009-11-03 11:50:10 -0800 | [diff] [blame] | 2685 | destroy_workqueue(fc_exch_workqueue); |
Robert Love | 42e9a92 | 2008-12-09 15:10:17 -0800 | [diff] [blame] | 2686 | kmem_cache_destroy(fc_em_cachep); |
| 2687 | } |