Long Li | 03bee01 | 2017-11-07 01:54:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017, Microsoft Corporation. |
| 3 | * |
| 4 | * Author(s): Long Li <longli@microsoft.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 14 | * the GNU General Public License for more details. |
| 15 | */ |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 17 | #include <linux/highmem.h> |
Long Li | 03bee01 | 2017-11-07 01:54:56 -0700 | [diff] [blame] | 18 | #include "smbdirect.h" |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 19 | #include "cifs_debug.h" |
Long Li | b6903bc | 2018-05-30 12:48:00 -0700 | [diff] [blame] | 20 | #include "cifsproto.h" |
Paulo Alcantara | 35e2cc1 | 2018-06-15 10:22:44 -0300 | [diff] [blame] | 21 | #include "smb2proto.h" |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 22 | |
| 23 | static struct smbd_response *get_empty_queue_buffer( |
| 24 | struct smbd_connection *info); |
| 25 | static struct smbd_response *get_receive_buffer( |
| 26 | struct smbd_connection *info); |
| 27 | static void put_receive_buffer( |
| 28 | struct smbd_connection *info, |
| 29 | struct smbd_response *response); |
| 30 | static int allocate_receive_buffers(struct smbd_connection *info, int num_buf); |
| 31 | static void destroy_receive_buffers(struct smbd_connection *info); |
| 32 | |
| 33 | static void put_empty_packet( |
| 34 | struct smbd_connection *info, struct smbd_response *response); |
| 35 | static void enqueue_reassembly( |
| 36 | struct smbd_connection *info, |
| 37 | struct smbd_response *response, int data_length); |
| 38 | static struct smbd_response *_get_first_reassembly( |
| 39 | struct smbd_connection *info); |
| 40 | |
| 41 | static int smbd_post_recv( |
| 42 | struct smbd_connection *info, |
| 43 | struct smbd_response *response); |
| 44 | |
| 45 | static int smbd_post_send_empty(struct smbd_connection *info); |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 46 | static int smbd_post_send_data( |
| 47 | struct smbd_connection *info, |
| 48 | struct kvec *iov, int n_vec, int remaining_data_length); |
| 49 | static int smbd_post_send_page(struct smbd_connection *info, |
| 50 | struct page *page, unsigned long offset, |
| 51 | size_t size, int remaining_data_length); |
Long Li | 03bee01 | 2017-11-07 01:54:56 -0700 | [diff] [blame] | 52 | |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 53 | static void destroy_mr_list(struct smbd_connection *info); |
| 54 | static int allocate_mr_list(struct smbd_connection *info); |
| 55 | |
Long Li | 03bee01 | 2017-11-07 01:54:56 -0700 | [diff] [blame] | 56 | /* SMBD version number */ |
| 57 | #define SMBD_V1 0x0100 |
| 58 | |
| 59 | /* Port numbers for SMBD transport */ |
| 60 | #define SMB_PORT 445 |
| 61 | #define SMBD_PORT 5445 |
| 62 | |
| 63 | /* Address lookup and resolve timeout in ms */ |
| 64 | #define RDMA_RESOLVE_TIMEOUT 5000 |
| 65 | |
| 66 | /* SMBD negotiation timeout in seconds */ |
| 67 | #define SMBD_NEGOTIATE_TIMEOUT 120 |
| 68 | |
| 69 | /* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */ |
| 70 | #define SMBD_MIN_RECEIVE_SIZE 128 |
| 71 | #define SMBD_MIN_FRAGMENTED_SIZE 131072 |
| 72 | |
| 73 | /* |
| 74 | * Default maximum number of RDMA read/write outstanding on this connection |
| 75 | * This value is possibly decreased during QP creation on hardware limit |
| 76 | */ |
| 77 | #define SMBD_CM_RESPONDER_RESOURCES 32 |
| 78 | |
| 79 | /* Maximum number of retries on data transfer operations */ |
| 80 | #define SMBD_CM_RETRY 6 |
| 81 | /* No need to retry on Receiver Not Ready since SMBD manages credits */ |
| 82 | #define SMBD_CM_RNR_RETRY 0 |
| 83 | |
| 84 | /* |
| 85 | * User configurable initial values per SMBD transport connection |
| 86 | * as defined in [MS-SMBD] 3.1.1.1 |
| 87 | * Those may change after a SMBD negotiation |
| 88 | */ |
| 89 | /* The local peer's maximum number of credits to grant to the peer */ |
| 90 | int smbd_receive_credit_max = 255; |
| 91 | |
| 92 | /* The remote peer's credit request of local peer */ |
| 93 | int smbd_send_credit_target = 255; |
| 94 | |
| 95 | /* The maximum single message size can be sent to remote peer */ |
| 96 | int smbd_max_send_size = 1364; |
| 97 | |
| 98 | /* The maximum fragmented upper-layer payload receive size supported */ |
| 99 | int smbd_max_fragmented_recv_size = 1024 * 1024; |
| 100 | |
| 101 | /* The maximum single-message size which can be received */ |
| 102 | int smbd_max_receive_size = 8192; |
| 103 | |
| 104 | /* The timeout to initiate send of a keepalive message on idle */ |
| 105 | int smbd_keep_alive_interval = 120; |
| 106 | |
| 107 | /* |
| 108 | * User configurable initial values for RDMA transport |
| 109 | * The actual values used may be lower and are limited to hardware capabilities |
| 110 | */ |
| 111 | /* Default maximum number of SGEs in a RDMA write/read */ |
| 112 | int smbd_max_frmr_depth = 2048; |
| 113 | |
| 114 | /* If payload is less than this byte, use RDMA send/recv not read/write */ |
| 115 | int rdma_readwrite_threshold = 4096; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 116 | |
| 117 | /* Transport logging functions |
| 118 | * Logging are defined as classes. They can be OR'ed to define the actual |
| 119 | * logging level via module parameter smbd_logging_class |
| 120 | * e.g. cifs.smbd_logging_class=0xa0 will log all log_rdma_recv() and |
| 121 | * log_rdma_event() |
| 122 | */ |
| 123 | #define LOG_OUTGOING 0x1 |
| 124 | #define LOG_INCOMING 0x2 |
| 125 | #define LOG_READ 0x4 |
| 126 | #define LOG_WRITE 0x8 |
| 127 | #define LOG_RDMA_SEND 0x10 |
| 128 | #define LOG_RDMA_RECV 0x20 |
| 129 | #define LOG_KEEP_ALIVE 0x40 |
| 130 | #define LOG_RDMA_EVENT 0x80 |
| 131 | #define LOG_RDMA_MR 0x100 |
| 132 | static unsigned int smbd_logging_class; |
| 133 | module_param(smbd_logging_class, uint, 0644); |
| 134 | MODULE_PARM_DESC(smbd_logging_class, |
| 135 | "Logging class for SMBD transport 0x0 to 0x100"); |
| 136 | |
| 137 | #define ERR 0x0 |
| 138 | #define INFO 0x1 |
| 139 | static unsigned int smbd_logging_level = ERR; |
| 140 | module_param(smbd_logging_level, uint, 0644); |
| 141 | MODULE_PARM_DESC(smbd_logging_level, |
| 142 | "Logging level for SMBD transport, 0 (default): error, 1: info"); |
| 143 | |
| 144 | #define log_rdma(level, class, fmt, args...) \ |
| 145 | do { \ |
| 146 | if (level <= smbd_logging_level || class & smbd_logging_class) \ |
| 147 | cifs_dbg(VFS, "%s:%d " fmt, __func__, __LINE__, ##args);\ |
| 148 | } while (0) |
| 149 | |
| 150 | #define log_outgoing(level, fmt, args...) \ |
| 151 | log_rdma(level, LOG_OUTGOING, fmt, ##args) |
| 152 | #define log_incoming(level, fmt, args...) \ |
| 153 | log_rdma(level, LOG_INCOMING, fmt, ##args) |
| 154 | #define log_read(level, fmt, args...) log_rdma(level, LOG_READ, fmt, ##args) |
| 155 | #define log_write(level, fmt, args...) log_rdma(level, LOG_WRITE, fmt, ##args) |
| 156 | #define log_rdma_send(level, fmt, args...) \ |
| 157 | log_rdma(level, LOG_RDMA_SEND, fmt, ##args) |
| 158 | #define log_rdma_recv(level, fmt, args...) \ |
| 159 | log_rdma(level, LOG_RDMA_RECV, fmt, ##args) |
| 160 | #define log_keep_alive(level, fmt, args...) \ |
| 161 | log_rdma(level, LOG_KEEP_ALIVE, fmt, ##args) |
| 162 | #define log_rdma_event(level, fmt, args...) \ |
| 163 | log_rdma(level, LOG_RDMA_EVENT, fmt, ##args) |
| 164 | #define log_rdma_mr(level, fmt, args...) \ |
| 165 | log_rdma(level, LOG_RDMA_MR, fmt, ##args) |
| 166 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 167 | static void smbd_disconnect_rdma_work(struct work_struct *work) |
| 168 | { |
| 169 | struct smbd_connection *info = |
| 170 | container_of(work, struct smbd_connection, disconnect_work); |
| 171 | |
| 172 | if (info->transport_status == SMBD_CONNECTED) { |
| 173 | info->transport_status = SMBD_DISCONNECTING; |
| 174 | rdma_disconnect(info->id); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | static void smbd_disconnect_rdma_connection(struct smbd_connection *info) |
| 179 | { |
| 180 | queue_work(info->workqueue, &info->disconnect_work); |
| 181 | } |
| 182 | |
| 183 | /* Upcall from RDMA CM */ |
| 184 | static int smbd_conn_upcall( |
| 185 | struct rdma_cm_id *id, struct rdma_cm_event *event) |
| 186 | { |
| 187 | struct smbd_connection *info = id->context; |
| 188 | |
| 189 | log_rdma_event(INFO, "event=%d status=%d\n", |
| 190 | event->event, event->status); |
| 191 | |
| 192 | switch (event->event) { |
| 193 | case RDMA_CM_EVENT_ADDR_RESOLVED: |
| 194 | case RDMA_CM_EVENT_ROUTE_RESOLVED: |
| 195 | info->ri_rc = 0; |
| 196 | complete(&info->ri_done); |
| 197 | break; |
| 198 | |
| 199 | case RDMA_CM_EVENT_ADDR_ERROR: |
| 200 | info->ri_rc = -EHOSTUNREACH; |
| 201 | complete(&info->ri_done); |
| 202 | break; |
| 203 | |
| 204 | case RDMA_CM_EVENT_ROUTE_ERROR: |
| 205 | info->ri_rc = -ENETUNREACH; |
| 206 | complete(&info->ri_done); |
| 207 | break; |
| 208 | |
| 209 | case RDMA_CM_EVENT_ESTABLISHED: |
| 210 | log_rdma_event(INFO, "connected event=%d\n", event->event); |
| 211 | info->transport_status = SMBD_CONNECTED; |
| 212 | wake_up_interruptible(&info->conn_wait); |
| 213 | break; |
| 214 | |
| 215 | case RDMA_CM_EVENT_CONNECT_ERROR: |
| 216 | case RDMA_CM_EVENT_UNREACHABLE: |
| 217 | case RDMA_CM_EVENT_REJECTED: |
| 218 | log_rdma_event(INFO, "connecting failed event=%d\n", event->event); |
| 219 | info->transport_status = SMBD_DISCONNECTED; |
| 220 | wake_up_interruptible(&info->conn_wait); |
| 221 | break; |
| 222 | |
| 223 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
| 224 | case RDMA_CM_EVENT_DISCONNECTED: |
| 225 | /* This happenes when we fail the negotiation */ |
| 226 | if (info->transport_status == SMBD_NEGOTIATE_FAILED) { |
| 227 | info->transport_status = SMBD_DISCONNECTED; |
| 228 | wake_up(&info->conn_wait); |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | info->transport_status = SMBD_DISCONNECTED; |
Long Li | e8b3bfe | 2019-04-05 21:36:31 +0000 | [diff] [blame] | 233 | wake_up_interruptible(&info->disconn_wait); |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 234 | wake_up_interruptible(&info->wait_reassembly_queue); |
| 235 | wake_up_interruptible_all(&info->wait_send_queue); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 236 | break; |
| 237 | |
| 238 | default: |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | /* Upcall from RDMA QP */ |
| 246 | static void |
| 247 | smbd_qp_async_error_upcall(struct ib_event *event, void *context) |
| 248 | { |
| 249 | struct smbd_connection *info = context; |
| 250 | |
| 251 | log_rdma_event(ERR, "%s on device %s info %p\n", |
| 252 | ib_event_msg(event->event), event->device->name, info); |
| 253 | |
| 254 | switch (event->event) { |
| 255 | case IB_EVENT_CQ_ERR: |
| 256 | case IB_EVENT_QP_FATAL: |
| 257 | smbd_disconnect_rdma_connection(info); |
| 258 | |
| 259 | default: |
| 260 | break; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | static inline void *smbd_request_payload(struct smbd_request *request) |
| 265 | { |
| 266 | return (void *)request->packet; |
| 267 | } |
| 268 | |
| 269 | static inline void *smbd_response_payload(struct smbd_response *response) |
| 270 | { |
| 271 | return (void *)response->packet; |
| 272 | } |
| 273 | |
| 274 | /* Called when a RDMA send is done */ |
| 275 | static void send_done(struct ib_cq *cq, struct ib_wc *wc) |
| 276 | { |
| 277 | int i; |
| 278 | struct smbd_request *request = |
| 279 | container_of(wc->wr_cqe, struct smbd_request, cqe); |
| 280 | |
| 281 | log_rdma_send(INFO, "smbd_request %p completed wc->status=%d\n", |
| 282 | request, wc->status); |
| 283 | |
| 284 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { |
| 285 | log_rdma_send(ERR, "wc->status=%d wc->opcode=%d\n", |
| 286 | wc->status, wc->opcode); |
| 287 | smbd_disconnect_rdma_connection(request->info); |
| 288 | } |
| 289 | |
| 290 | for (i = 0; i < request->num_sge; i++) |
| 291 | ib_dma_unmap_single(request->info->id->device, |
| 292 | request->sge[i].addr, |
| 293 | request->sge[i].length, |
| 294 | DMA_TO_DEVICE); |
| 295 | |
| 296 | if (request->has_payload) { |
| 297 | if (atomic_dec_and_test(&request->info->send_payload_pending)) |
| 298 | wake_up(&request->info->wait_send_payload_pending); |
| 299 | } else { |
| 300 | if (atomic_dec_and_test(&request->info->send_pending)) |
| 301 | wake_up(&request->info->wait_send_pending); |
| 302 | } |
| 303 | |
| 304 | mempool_free(request, request->info->request_mempool); |
| 305 | } |
| 306 | |
| 307 | static void dump_smbd_negotiate_resp(struct smbd_negotiate_resp *resp) |
| 308 | { |
| 309 | log_rdma_event(INFO, "resp message min_version %u max_version %u " |
| 310 | "negotiated_version %u credits_requested %u " |
| 311 | "credits_granted %u status %u max_readwrite_size %u " |
| 312 | "preferred_send_size %u max_receive_size %u " |
| 313 | "max_fragmented_size %u\n", |
| 314 | resp->min_version, resp->max_version, resp->negotiated_version, |
| 315 | resp->credits_requested, resp->credits_granted, resp->status, |
| 316 | resp->max_readwrite_size, resp->preferred_send_size, |
| 317 | resp->max_receive_size, resp->max_fragmented_size); |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Process a negotiation response message, according to [MS-SMBD]3.1.5.7 |
| 322 | * response, packet_length: the negotiation response message |
| 323 | * return value: true if negotiation is a success, false if failed |
| 324 | */ |
| 325 | static bool process_negotiation_response( |
| 326 | struct smbd_response *response, int packet_length) |
| 327 | { |
| 328 | struct smbd_connection *info = response->info; |
| 329 | struct smbd_negotiate_resp *packet = smbd_response_payload(response); |
| 330 | |
| 331 | if (packet_length < sizeof(struct smbd_negotiate_resp)) { |
| 332 | log_rdma_event(ERR, |
| 333 | "error: packet_length=%d\n", packet_length); |
| 334 | return false; |
| 335 | } |
| 336 | |
| 337 | if (le16_to_cpu(packet->negotiated_version) != SMBD_V1) { |
| 338 | log_rdma_event(ERR, "error: negotiated_version=%x\n", |
| 339 | le16_to_cpu(packet->negotiated_version)); |
| 340 | return false; |
| 341 | } |
| 342 | info->protocol = le16_to_cpu(packet->negotiated_version); |
| 343 | |
| 344 | if (packet->credits_requested == 0) { |
| 345 | log_rdma_event(ERR, "error: credits_requested==0\n"); |
| 346 | return false; |
| 347 | } |
| 348 | info->receive_credit_target = le16_to_cpu(packet->credits_requested); |
| 349 | |
| 350 | if (packet->credits_granted == 0) { |
| 351 | log_rdma_event(ERR, "error: credits_granted==0\n"); |
| 352 | return false; |
| 353 | } |
| 354 | atomic_set(&info->send_credits, le16_to_cpu(packet->credits_granted)); |
| 355 | |
| 356 | atomic_set(&info->receive_credits, 0); |
| 357 | |
| 358 | if (le32_to_cpu(packet->preferred_send_size) > info->max_receive_size) { |
| 359 | log_rdma_event(ERR, "error: preferred_send_size=%d\n", |
| 360 | le32_to_cpu(packet->preferred_send_size)); |
| 361 | return false; |
| 362 | } |
| 363 | info->max_receive_size = le32_to_cpu(packet->preferred_send_size); |
| 364 | |
| 365 | if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) { |
| 366 | log_rdma_event(ERR, "error: max_receive_size=%d\n", |
| 367 | le32_to_cpu(packet->max_receive_size)); |
| 368 | return false; |
| 369 | } |
| 370 | info->max_send_size = min_t(int, info->max_send_size, |
| 371 | le32_to_cpu(packet->max_receive_size)); |
| 372 | |
| 373 | if (le32_to_cpu(packet->max_fragmented_size) < |
| 374 | SMBD_MIN_FRAGMENTED_SIZE) { |
| 375 | log_rdma_event(ERR, "error: max_fragmented_size=%d\n", |
| 376 | le32_to_cpu(packet->max_fragmented_size)); |
| 377 | return false; |
| 378 | } |
| 379 | info->max_fragmented_send_size = |
| 380 | le32_to_cpu(packet->max_fragmented_size); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 381 | info->rdma_readwrite_threshold = |
| 382 | rdma_readwrite_threshold > info->max_fragmented_send_size ? |
| 383 | info->max_fragmented_send_size : |
| 384 | rdma_readwrite_threshold; |
| 385 | |
| 386 | |
| 387 | info->max_readwrite_size = min_t(u32, |
| 388 | le32_to_cpu(packet->max_readwrite_size), |
| 389 | info->max_frmr_depth * PAGE_SIZE); |
| 390 | info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 391 | |
| 392 | return true; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Check and schedule to send an immediate packet |
| 397 | * This is used to extend credtis to remote peer to keep the transport busy |
| 398 | */ |
| 399 | static void check_and_send_immediate(struct smbd_connection *info) |
| 400 | { |
| 401 | if (info->transport_status != SMBD_CONNECTED) |
| 402 | return; |
| 403 | |
| 404 | info->send_immediate = true; |
| 405 | |
| 406 | /* |
| 407 | * Promptly send a packet if our peer is running low on receive |
| 408 | * credits |
| 409 | */ |
| 410 | if (atomic_read(&info->receive_credits) < |
| 411 | info->receive_credit_target - 1) |
| 412 | queue_delayed_work( |
| 413 | info->workqueue, &info->send_immediate_work, 0); |
| 414 | } |
| 415 | |
| 416 | static void smbd_post_send_credits(struct work_struct *work) |
| 417 | { |
| 418 | int ret = 0; |
| 419 | int use_receive_queue = 1; |
| 420 | int rc; |
| 421 | struct smbd_response *response; |
| 422 | struct smbd_connection *info = |
| 423 | container_of(work, struct smbd_connection, |
| 424 | post_send_credits_work); |
| 425 | |
| 426 | if (info->transport_status != SMBD_CONNECTED) { |
| 427 | wake_up(&info->wait_receive_queues); |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | if (info->receive_credit_target > |
| 432 | atomic_read(&info->receive_credits)) { |
| 433 | while (true) { |
| 434 | if (use_receive_queue) |
| 435 | response = get_receive_buffer(info); |
| 436 | else |
| 437 | response = get_empty_queue_buffer(info); |
| 438 | if (!response) { |
| 439 | /* now switch to emtpy packet queue */ |
| 440 | if (use_receive_queue) { |
| 441 | use_receive_queue = 0; |
| 442 | continue; |
| 443 | } else |
| 444 | break; |
| 445 | } |
| 446 | |
| 447 | response->type = SMBD_TRANSFER_DATA; |
| 448 | response->first_segment = false; |
| 449 | rc = smbd_post_recv(info, response); |
| 450 | if (rc) { |
| 451 | log_rdma_recv(ERR, |
| 452 | "post_recv failed rc=%d\n", rc); |
| 453 | put_receive_buffer(info, response); |
| 454 | break; |
| 455 | } |
| 456 | |
| 457 | ret++; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | spin_lock(&info->lock_new_credits_offered); |
| 462 | info->new_credits_offered += ret; |
| 463 | spin_unlock(&info->lock_new_credits_offered); |
| 464 | |
| 465 | atomic_add(ret, &info->receive_credits); |
| 466 | |
| 467 | /* Check if we can post new receive and grant credits to peer */ |
| 468 | check_and_send_immediate(info); |
| 469 | } |
| 470 | |
| 471 | static void smbd_recv_done_work(struct work_struct *work) |
| 472 | { |
| 473 | struct smbd_connection *info = |
| 474 | container_of(work, struct smbd_connection, recv_done_work); |
| 475 | |
| 476 | /* |
| 477 | * We may have new send credits granted from remote peer |
| 478 | * If any sender is blcoked on lack of credets, unblock it |
| 479 | */ |
| 480 | if (atomic_read(&info->send_credits)) |
| 481 | wake_up_interruptible(&info->wait_send_queue); |
| 482 | |
| 483 | /* |
| 484 | * Check if we need to send something to remote peer to |
| 485 | * grant more credits or respond to KEEP_ALIVE packet |
| 486 | */ |
| 487 | check_and_send_immediate(info); |
| 488 | } |
| 489 | |
| 490 | /* Called from softirq, when recv is done */ |
| 491 | static void recv_done(struct ib_cq *cq, struct ib_wc *wc) |
| 492 | { |
| 493 | struct smbd_data_transfer *data_transfer; |
| 494 | struct smbd_response *response = |
| 495 | container_of(wc->wr_cqe, struct smbd_response, cqe); |
| 496 | struct smbd_connection *info = response->info; |
| 497 | int data_length = 0; |
| 498 | |
| 499 | log_rdma_recv(INFO, "response=%p type=%d wc status=%d wc opcode %d " |
| 500 | "byte_len=%d pkey_index=%x\n", |
| 501 | response, response->type, wc->status, wc->opcode, |
| 502 | wc->byte_len, wc->pkey_index); |
| 503 | |
| 504 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { |
| 505 | log_rdma_recv(INFO, "wc->status=%d opcode=%d\n", |
| 506 | wc->status, wc->opcode); |
| 507 | smbd_disconnect_rdma_connection(info); |
| 508 | goto error; |
| 509 | } |
| 510 | |
| 511 | ib_dma_sync_single_for_cpu( |
| 512 | wc->qp->device, |
| 513 | response->sge.addr, |
| 514 | response->sge.length, |
| 515 | DMA_FROM_DEVICE); |
| 516 | |
| 517 | switch (response->type) { |
| 518 | /* SMBD negotiation response */ |
| 519 | case SMBD_NEGOTIATE_RESP: |
| 520 | dump_smbd_negotiate_resp(smbd_response_payload(response)); |
| 521 | info->full_packet_received = true; |
| 522 | info->negotiate_done = |
| 523 | process_negotiation_response(response, wc->byte_len); |
| 524 | complete(&info->negotiate_completion); |
| 525 | break; |
| 526 | |
| 527 | /* SMBD data transfer packet */ |
| 528 | case SMBD_TRANSFER_DATA: |
| 529 | data_transfer = smbd_response_payload(response); |
| 530 | data_length = le32_to_cpu(data_transfer->data_length); |
| 531 | |
| 532 | /* |
| 533 | * If this is a packet with data playload place the data in |
| 534 | * reassembly queue and wake up the reading thread |
| 535 | */ |
| 536 | if (data_length) { |
| 537 | if (info->full_packet_received) |
| 538 | response->first_segment = true; |
| 539 | |
| 540 | if (le32_to_cpu(data_transfer->remaining_data_length)) |
| 541 | info->full_packet_received = false; |
| 542 | else |
| 543 | info->full_packet_received = true; |
| 544 | |
| 545 | enqueue_reassembly( |
| 546 | info, |
| 547 | response, |
| 548 | data_length); |
| 549 | } else |
| 550 | put_empty_packet(info, response); |
| 551 | |
| 552 | if (data_length) |
| 553 | wake_up_interruptible(&info->wait_reassembly_queue); |
| 554 | |
| 555 | atomic_dec(&info->receive_credits); |
| 556 | info->receive_credit_target = |
| 557 | le16_to_cpu(data_transfer->credits_requested); |
| 558 | atomic_add(le16_to_cpu(data_transfer->credits_granted), |
| 559 | &info->send_credits); |
| 560 | |
| 561 | log_incoming(INFO, "data flags %d data_offset %d " |
| 562 | "data_length %d remaining_data_length %d\n", |
| 563 | le16_to_cpu(data_transfer->flags), |
| 564 | le32_to_cpu(data_transfer->data_offset), |
| 565 | le32_to_cpu(data_transfer->data_length), |
| 566 | le32_to_cpu(data_transfer->remaining_data_length)); |
| 567 | |
| 568 | /* Send a KEEP_ALIVE response right away if requested */ |
| 569 | info->keep_alive_requested = KEEP_ALIVE_NONE; |
| 570 | if (le16_to_cpu(data_transfer->flags) & |
| 571 | SMB_DIRECT_RESPONSE_REQUESTED) { |
| 572 | info->keep_alive_requested = KEEP_ALIVE_PENDING; |
| 573 | } |
| 574 | |
| 575 | queue_work(info->workqueue, &info->recv_done_work); |
| 576 | return; |
| 577 | |
| 578 | default: |
| 579 | log_rdma_recv(ERR, |
| 580 | "unexpected response type=%d\n", response->type); |
| 581 | } |
| 582 | |
| 583 | error: |
| 584 | put_receive_buffer(info, response); |
| 585 | } |
| 586 | |
| 587 | static struct rdma_cm_id *smbd_create_id( |
| 588 | struct smbd_connection *info, |
| 589 | struct sockaddr *dstaddr, int port) |
| 590 | { |
| 591 | struct rdma_cm_id *id; |
| 592 | int rc; |
| 593 | __be16 *sport; |
| 594 | |
| 595 | id = rdma_create_id(&init_net, smbd_conn_upcall, info, |
| 596 | RDMA_PS_TCP, IB_QPT_RC); |
| 597 | if (IS_ERR(id)) { |
| 598 | rc = PTR_ERR(id); |
| 599 | log_rdma_event(ERR, "rdma_create_id() failed %i\n", rc); |
| 600 | return id; |
| 601 | } |
| 602 | |
| 603 | if (dstaddr->sa_family == AF_INET6) |
| 604 | sport = &((struct sockaddr_in6 *)dstaddr)->sin6_port; |
| 605 | else |
| 606 | sport = &((struct sockaddr_in *)dstaddr)->sin_port; |
| 607 | |
| 608 | *sport = htons(port); |
| 609 | |
| 610 | init_completion(&info->ri_done); |
| 611 | info->ri_rc = -ETIMEDOUT; |
| 612 | |
| 613 | rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr, |
| 614 | RDMA_RESOLVE_TIMEOUT); |
| 615 | if (rc) { |
| 616 | log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc); |
| 617 | goto out; |
| 618 | } |
| 619 | wait_for_completion_interruptible_timeout( |
| 620 | &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); |
| 621 | rc = info->ri_rc; |
| 622 | if (rc) { |
| 623 | log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc); |
| 624 | goto out; |
| 625 | } |
| 626 | |
| 627 | info->ri_rc = -ETIMEDOUT; |
| 628 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
| 629 | if (rc) { |
| 630 | log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc); |
| 631 | goto out; |
| 632 | } |
| 633 | wait_for_completion_interruptible_timeout( |
| 634 | &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); |
| 635 | rc = info->ri_rc; |
| 636 | if (rc) { |
| 637 | log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc); |
| 638 | goto out; |
| 639 | } |
| 640 | |
| 641 | return id; |
| 642 | |
| 643 | out: |
| 644 | rdma_destroy_id(id); |
| 645 | return ERR_PTR(rc); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Test if FRWR (Fast Registration Work Requests) is supported on the device |
| 650 | * This implementation requries FRWR on RDMA read/write |
| 651 | * return value: true if it is supported |
| 652 | */ |
| 653 | static bool frwr_is_supported(struct ib_device_attr *attrs) |
| 654 | { |
| 655 | if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) |
| 656 | return false; |
| 657 | if (attrs->max_fast_reg_page_list_len == 0) |
| 658 | return false; |
| 659 | return true; |
| 660 | } |
| 661 | |
| 662 | static int smbd_ia_open( |
| 663 | struct smbd_connection *info, |
| 664 | struct sockaddr *dstaddr, int port) |
| 665 | { |
| 666 | int rc; |
| 667 | |
| 668 | info->id = smbd_create_id(info, dstaddr, port); |
| 669 | if (IS_ERR(info->id)) { |
| 670 | rc = PTR_ERR(info->id); |
| 671 | goto out1; |
| 672 | } |
| 673 | |
| 674 | if (!frwr_is_supported(&info->id->device->attrs)) { |
| 675 | log_rdma_event(ERR, |
| 676 | "Fast Registration Work Requests " |
| 677 | "(FRWR) is not supported\n"); |
| 678 | log_rdma_event(ERR, |
| 679 | "Device capability flags = %llx " |
| 680 | "max_fast_reg_page_list_len = %u\n", |
| 681 | info->id->device->attrs.device_cap_flags, |
| 682 | info->id->device->attrs.max_fast_reg_page_list_len); |
| 683 | rc = -EPROTONOSUPPORT; |
| 684 | goto out2; |
| 685 | } |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 686 | info->max_frmr_depth = min_t(int, |
| 687 | smbd_max_frmr_depth, |
| 688 | info->id->device->attrs.max_fast_reg_page_list_len); |
| 689 | info->mr_type = IB_MR_TYPE_MEM_REG; |
| 690 | if (info->id->device->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) |
| 691 | info->mr_type = IB_MR_TYPE_SG_GAPS; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 692 | |
| 693 | info->pd = ib_alloc_pd(info->id->device, 0); |
| 694 | if (IS_ERR(info->pd)) { |
| 695 | rc = PTR_ERR(info->pd); |
| 696 | log_rdma_event(ERR, "ib_alloc_pd() returned %d\n", rc); |
| 697 | goto out2; |
| 698 | } |
| 699 | |
| 700 | return 0; |
| 701 | |
| 702 | out2: |
| 703 | rdma_destroy_id(info->id); |
| 704 | info->id = NULL; |
| 705 | |
| 706 | out1: |
| 707 | return rc; |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | * Send a negotiation request message to the peer |
| 712 | * The negotiation procedure is in [MS-SMBD] 3.1.5.2 and 3.1.5.3 |
| 713 | * After negotiation, the transport is connected and ready for |
| 714 | * carrying upper layer SMB payload |
| 715 | */ |
| 716 | static int smbd_post_send_negotiate_req(struct smbd_connection *info) |
| 717 | { |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 718 | struct ib_send_wr send_wr; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 719 | int rc = -ENOMEM; |
| 720 | struct smbd_request *request; |
| 721 | struct smbd_negotiate_req *packet; |
| 722 | |
| 723 | request = mempool_alloc(info->request_mempool, GFP_KERNEL); |
| 724 | if (!request) |
| 725 | return rc; |
| 726 | |
| 727 | request->info = info; |
| 728 | |
| 729 | packet = smbd_request_payload(request); |
| 730 | packet->min_version = cpu_to_le16(SMBD_V1); |
| 731 | packet->max_version = cpu_to_le16(SMBD_V1); |
| 732 | packet->reserved = 0; |
| 733 | packet->credits_requested = cpu_to_le16(info->send_credit_target); |
| 734 | packet->preferred_send_size = cpu_to_le32(info->max_send_size); |
| 735 | packet->max_receive_size = cpu_to_le32(info->max_receive_size); |
| 736 | packet->max_fragmented_size = |
| 737 | cpu_to_le32(info->max_fragmented_recv_size); |
| 738 | |
| 739 | request->num_sge = 1; |
| 740 | request->sge[0].addr = ib_dma_map_single( |
| 741 | info->id->device, (void *)packet, |
| 742 | sizeof(*packet), DMA_TO_DEVICE); |
| 743 | if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { |
| 744 | rc = -EIO; |
| 745 | goto dma_mapping_failed; |
| 746 | } |
| 747 | |
| 748 | request->sge[0].length = sizeof(*packet); |
| 749 | request->sge[0].lkey = info->pd->local_dma_lkey; |
| 750 | |
| 751 | ib_dma_sync_single_for_device( |
| 752 | info->id->device, request->sge[0].addr, |
| 753 | request->sge[0].length, DMA_TO_DEVICE); |
| 754 | |
| 755 | request->cqe.done = send_done; |
| 756 | |
| 757 | send_wr.next = NULL; |
| 758 | send_wr.wr_cqe = &request->cqe; |
| 759 | send_wr.sg_list = request->sge; |
| 760 | send_wr.num_sge = request->num_sge; |
| 761 | send_wr.opcode = IB_WR_SEND; |
| 762 | send_wr.send_flags = IB_SEND_SIGNALED; |
| 763 | |
| 764 | log_rdma_send(INFO, "sge addr=%llx length=%x lkey=%x\n", |
| 765 | request->sge[0].addr, |
| 766 | request->sge[0].length, request->sge[0].lkey); |
| 767 | |
| 768 | request->has_payload = false; |
| 769 | atomic_inc(&info->send_pending); |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 770 | rc = ib_post_send(info->id->qp, &send_wr, NULL); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 771 | if (!rc) |
| 772 | return 0; |
| 773 | |
| 774 | /* if we reach here, post send failed */ |
| 775 | log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); |
| 776 | atomic_dec(&info->send_pending); |
| 777 | ib_dma_unmap_single(info->id->device, request->sge[0].addr, |
| 778 | request->sge[0].length, DMA_TO_DEVICE); |
| 779 | |
Long Li | 21a4e14 | 2018-03-30 15:16:36 -0700 | [diff] [blame] | 780 | smbd_disconnect_rdma_connection(info); |
| 781 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 782 | dma_mapping_failed: |
| 783 | mempool_free(request, info->request_mempool); |
| 784 | return rc; |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * Extend the credits to remote peer |
| 789 | * This implements [MS-SMBD] 3.1.5.9 |
| 790 | * The idea is that we should extend credits to remote peer as quickly as |
| 791 | * it's allowed, to maintain data flow. We allocate as much receive |
| 792 | * buffer as possible, and extend the receive credits to remote peer |
| 793 | * return value: the new credtis being granted. |
| 794 | */ |
| 795 | static int manage_credits_prior_sending(struct smbd_connection *info) |
| 796 | { |
| 797 | int new_credits; |
| 798 | |
| 799 | spin_lock(&info->lock_new_credits_offered); |
| 800 | new_credits = info->new_credits_offered; |
| 801 | info->new_credits_offered = 0; |
| 802 | spin_unlock(&info->lock_new_credits_offered); |
| 803 | |
| 804 | return new_credits; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Check if we need to send a KEEP_ALIVE message |
| 809 | * The idle connection timer triggers a KEEP_ALIVE message when expires |
| 810 | * SMB_DIRECT_RESPONSE_REQUESTED is set in the message flag to have peer send |
| 811 | * back a response. |
| 812 | * return value: |
| 813 | * 1 if SMB_DIRECT_RESPONSE_REQUESTED needs to be set |
| 814 | * 0: otherwise |
| 815 | */ |
| 816 | static int manage_keep_alive_before_sending(struct smbd_connection *info) |
| 817 | { |
| 818 | if (info->keep_alive_requested == KEEP_ALIVE_PENDING) { |
| 819 | info->keep_alive_requested = KEEP_ALIVE_SENT; |
| 820 | return 1; |
| 821 | } |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | /* |
| 826 | * Build and prepare the SMBD packet header |
| 827 | * This function waits for avaialbe send credits and build a SMBD packet |
| 828 | * header. The caller then optional append payload to the packet after |
| 829 | * the header |
| 830 | * intput values |
| 831 | * size: the size of the payload |
| 832 | * remaining_data_length: remaining data to send if this is part of a |
| 833 | * fragmented packet |
| 834 | * output values |
| 835 | * request_out: the request allocated from this function |
| 836 | * return values: 0 on success, otherwise actual error code returned |
| 837 | */ |
| 838 | static int smbd_create_header(struct smbd_connection *info, |
| 839 | int size, int remaining_data_length, |
| 840 | struct smbd_request **request_out) |
| 841 | { |
| 842 | struct smbd_request *request; |
| 843 | struct smbd_data_transfer *packet; |
| 844 | int header_length; |
| 845 | int rc; |
| 846 | |
| 847 | /* Wait for send credits. A SMBD packet needs one credit */ |
| 848 | rc = wait_event_interruptible(info->wait_send_queue, |
| 849 | atomic_read(&info->send_credits) > 0 || |
| 850 | info->transport_status != SMBD_CONNECTED); |
| 851 | if (rc) |
| 852 | return rc; |
| 853 | |
| 854 | if (info->transport_status != SMBD_CONNECTED) { |
| 855 | log_outgoing(ERR, "disconnected not sending\n"); |
| 856 | return -ENOENT; |
| 857 | } |
| 858 | atomic_dec(&info->send_credits); |
| 859 | |
| 860 | request = mempool_alloc(info->request_mempool, GFP_KERNEL); |
| 861 | if (!request) { |
| 862 | rc = -ENOMEM; |
| 863 | goto err; |
| 864 | } |
| 865 | |
| 866 | request->info = info; |
| 867 | |
| 868 | /* Fill in the packet header */ |
| 869 | packet = smbd_request_payload(request); |
| 870 | packet->credits_requested = cpu_to_le16(info->send_credit_target); |
| 871 | packet->credits_granted = |
| 872 | cpu_to_le16(manage_credits_prior_sending(info)); |
| 873 | info->send_immediate = false; |
| 874 | |
| 875 | packet->flags = 0; |
| 876 | if (manage_keep_alive_before_sending(info)) |
| 877 | packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED); |
| 878 | |
| 879 | packet->reserved = 0; |
| 880 | if (!size) |
| 881 | packet->data_offset = 0; |
| 882 | else |
| 883 | packet->data_offset = cpu_to_le32(24); |
| 884 | packet->data_length = cpu_to_le32(size); |
| 885 | packet->remaining_data_length = cpu_to_le32(remaining_data_length); |
| 886 | packet->padding = 0; |
| 887 | |
| 888 | log_outgoing(INFO, "credits_requested=%d credits_granted=%d " |
| 889 | "data_offset=%d data_length=%d remaining_data_length=%d\n", |
| 890 | le16_to_cpu(packet->credits_requested), |
| 891 | le16_to_cpu(packet->credits_granted), |
| 892 | le32_to_cpu(packet->data_offset), |
| 893 | le32_to_cpu(packet->data_length), |
| 894 | le32_to_cpu(packet->remaining_data_length)); |
| 895 | |
| 896 | /* Map the packet to DMA */ |
| 897 | header_length = sizeof(struct smbd_data_transfer); |
| 898 | /* If this is a packet without payload, don't send padding */ |
| 899 | if (!size) |
| 900 | header_length = offsetof(struct smbd_data_transfer, padding); |
| 901 | |
| 902 | request->num_sge = 1; |
| 903 | request->sge[0].addr = ib_dma_map_single(info->id->device, |
| 904 | (void *)packet, |
| 905 | header_length, |
| 906 | DMA_BIDIRECTIONAL); |
| 907 | if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { |
| 908 | mempool_free(request, info->request_mempool); |
| 909 | rc = -EIO; |
| 910 | goto err; |
| 911 | } |
| 912 | |
| 913 | request->sge[0].length = header_length; |
| 914 | request->sge[0].lkey = info->pd->local_dma_lkey; |
| 915 | |
| 916 | *request_out = request; |
| 917 | return 0; |
| 918 | |
| 919 | err: |
| 920 | atomic_inc(&info->send_credits); |
| 921 | return rc; |
| 922 | } |
| 923 | |
| 924 | static void smbd_destroy_header(struct smbd_connection *info, |
| 925 | struct smbd_request *request) |
| 926 | { |
| 927 | |
| 928 | ib_dma_unmap_single(info->id->device, |
| 929 | request->sge[0].addr, |
| 930 | request->sge[0].length, |
| 931 | DMA_TO_DEVICE); |
| 932 | mempool_free(request, info->request_mempool); |
| 933 | atomic_inc(&info->send_credits); |
| 934 | } |
| 935 | |
| 936 | /* Post the send request */ |
| 937 | static int smbd_post_send(struct smbd_connection *info, |
| 938 | struct smbd_request *request, bool has_payload) |
| 939 | { |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 940 | struct ib_send_wr send_wr; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 941 | int rc, i; |
| 942 | |
| 943 | for (i = 0; i < request->num_sge; i++) { |
| 944 | log_rdma_send(INFO, |
Colin Ian King | ac65cb6 | 2018-02-09 12:14:15 +0000 | [diff] [blame] | 945 | "rdma_request sge[%d] addr=%llu length=%u\n", |
Long Li | ff30b89 | 2018-04-17 12:17:10 -0700 | [diff] [blame] | 946 | i, request->sge[i].addr, request->sge[i].length); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 947 | ib_dma_sync_single_for_device( |
| 948 | info->id->device, |
| 949 | request->sge[i].addr, |
| 950 | request->sge[i].length, |
| 951 | DMA_TO_DEVICE); |
| 952 | } |
| 953 | |
| 954 | request->cqe.done = send_done; |
| 955 | |
| 956 | send_wr.next = NULL; |
| 957 | send_wr.wr_cqe = &request->cqe; |
| 958 | send_wr.sg_list = request->sge; |
| 959 | send_wr.num_sge = request->num_sge; |
| 960 | send_wr.opcode = IB_WR_SEND; |
| 961 | send_wr.send_flags = IB_SEND_SIGNALED; |
| 962 | |
| 963 | if (has_payload) { |
| 964 | request->has_payload = true; |
| 965 | atomic_inc(&info->send_payload_pending); |
| 966 | } else { |
| 967 | request->has_payload = false; |
| 968 | atomic_inc(&info->send_pending); |
| 969 | } |
| 970 | |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 971 | rc = ib_post_send(info->id->qp, &send_wr, NULL); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 972 | if (rc) { |
| 973 | log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); |
| 974 | if (has_payload) { |
| 975 | if (atomic_dec_and_test(&info->send_payload_pending)) |
| 976 | wake_up(&info->wait_send_payload_pending); |
| 977 | } else { |
| 978 | if (atomic_dec_and_test(&info->send_pending)) |
| 979 | wake_up(&info->wait_send_pending); |
| 980 | } |
Long Li | 21a4e14 | 2018-03-30 15:16:36 -0700 | [diff] [blame] | 981 | smbd_disconnect_rdma_connection(info); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 982 | } else |
| 983 | /* Reset timer for idle connection after packet is sent */ |
| 984 | mod_delayed_work(info->workqueue, &info->idle_timer_work, |
| 985 | info->keep_alive_interval*HZ); |
| 986 | |
| 987 | return rc; |
| 988 | } |
| 989 | |
| 990 | static int smbd_post_send_sgl(struct smbd_connection *info, |
| 991 | struct scatterlist *sgl, int data_length, int remaining_data_length) |
| 992 | { |
| 993 | int num_sgs; |
| 994 | int i, rc; |
| 995 | struct smbd_request *request; |
| 996 | struct scatterlist *sg; |
| 997 | |
| 998 | rc = smbd_create_header( |
| 999 | info, data_length, remaining_data_length, &request); |
| 1000 | if (rc) |
| 1001 | return rc; |
| 1002 | |
| 1003 | num_sgs = sgl ? sg_nents(sgl) : 0; |
| 1004 | for_each_sg(sgl, sg, num_sgs, i) { |
| 1005 | request->sge[i+1].addr = |
| 1006 | ib_dma_map_page(info->id->device, sg_page(sg), |
| 1007 | sg->offset, sg->length, DMA_BIDIRECTIONAL); |
| 1008 | if (ib_dma_mapping_error( |
| 1009 | info->id->device, request->sge[i+1].addr)) { |
| 1010 | rc = -EIO; |
| 1011 | request->sge[i+1].addr = 0; |
| 1012 | goto dma_mapping_failure; |
| 1013 | } |
| 1014 | request->sge[i+1].length = sg->length; |
| 1015 | request->sge[i+1].lkey = info->pd->local_dma_lkey; |
| 1016 | request->num_sge++; |
| 1017 | } |
| 1018 | |
| 1019 | rc = smbd_post_send(info, request, data_length); |
| 1020 | if (!rc) |
| 1021 | return 0; |
| 1022 | |
| 1023 | dma_mapping_failure: |
| 1024 | for (i = 1; i < request->num_sge; i++) |
| 1025 | if (request->sge[i].addr) |
| 1026 | ib_dma_unmap_single(info->id->device, |
| 1027 | request->sge[i].addr, |
| 1028 | request->sge[i].length, |
| 1029 | DMA_TO_DEVICE); |
| 1030 | smbd_destroy_header(info, request); |
| 1031 | return rc; |
| 1032 | } |
| 1033 | |
| 1034 | /* |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 1035 | * Send a page |
| 1036 | * page: the page to send |
| 1037 | * offset: offset in the page to send |
| 1038 | * size: length in the page to send |
| 1039 | * remaining_data_length: remaining data to send in this payload |
| 1040 | */ |
| 1041 | static int smbd_post_send_page(struct smbd_connection *info, struct page *page, |
| 1042 | unsigned long offset, size_t size, int remaining_data_length) |
| 1043 | { |
| 1044 | struct scatterlist sgl; |
| 1045 | |
| 1046 | sg_init_table(&sgl, 1); |
| 1047 | sg_set_page(&sgl, page, size, offset); |
| 1048 | |
| 1049 | return smbd_post_send_sgl(info, &sgl, size, remaining_data_length); |
| 1050 | } |
| 1051 | |
| 1052 | /* |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1053 | * Send an empty message |
| 1054 | * Empty message is used to extend credits to peer to for keep live |
| 1055 | * while there is no upper layer payload to send at the time |
| 1056 | */ |
| 1057 | static int smbd_post_send_empty(struct smbd_connection *info) |
| 1058 | { |
| 1059 | info->count_send_empty++; |
| 1060 | return smbd_post_send_sgl(info, NULL, 0, 0); |
| 1061 | } |
| 1062 | |
| 1063 | /* |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 1064 | * Send a data buffer |
| 1065 | * iov: the iov array describing the data buffers |
| 1066 | * n_vec: number of iov array |
| 1067 | * remaining_data_length: remaining data to send following this packet |
| 1068 | * in segmented SMBD packet |
| 1069 | */ |
| 1070 | static int smbd_post_send_data( |
| 1071 | struct smbd_connection *info, struct kvec *iov, int n_vec, |
| 1072 | int remaining_data_length) |
| 1073 | { |
| 1074 | int i; |
| 1075 | u32 data_length = 0; |
| 1076 | struct scatterlist sgl[SMBDIRECT_MAX_SGE]; |
| 1077 | |
| 1078 | if (n_vec > SMBDIRECT_MAX_SGE) { |
| 1079 | cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec); |
| 1080 | return -ENOMEM; |
| 1081 | } |
| 1082 | |
| 1083 | sg_init_table(sgl, n_vec); |
| 1084 | for (i = 0; i < n_vec; i++) { |
| 1085 | data_length += iov[i].iov_len; |
| 1086 | sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len); |
| 1087 | } |
| 1088 | |
| 1089 | return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length); |
| 1090 | } |
| 1091 | |
| 1092 | /* |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1093 | * Post a receive request to the transport |
| 1094 | * The remote peer can only send data when a receive request is posted |
| 1095 | * The interaction is controlled by send/receive credit system |
| 1096 | */ |
| 1097 | static int smbd_post_recv( |
| 1098 | struct smbd_connection *info, struct smbd_response *response) |
| 1099 | { |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 1100 | struct ib_recv_wr recv_wr; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1101 | int rc = -EIO; |
| 1102 | |
| 1103 | response->sge.addr = ib_dma_map_single( |
| 1104 | info->id->device, response->packet, |
| 1105 | info->max_receive_size, DMA_FROM_DEVICE); |
| 1106 | if (ib_dma_mapping_error(info->id->device, response->sge.addr)) |
| 1107 | return rc; |
| 1108 | |
| 1109 | response->sge.length = info->max_receive_size; |
| 1110 | response->sge.lkey = info->pd->local_dma_lkey; |
| 1111 | |
| 1112 | response->cqe.done = recv_done; |
| 1113 | |
| 1114 | recv_wr.wr_cqe = &response->cqe; |
| 1115 | recv_wr.next = NULL; |
| 1116 | recv_wr.sg_list = &response->sge; |
| 1117 | recv_wr.num_sge = 1; |
| 1118 | |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 1119 | rc = ib_post_recv(info->id->qp, &recv_wr, NULL); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1120 | if (rc) { |
| 1121 | ib_dma_unmap_single(info->id->device, response->sge.addr, |
| 1122 | response->sge.length, DMA_FROM_DEVICE); |
Long Li | 21a4e14 | 2018-03-30 15:16:36 -0700 | [diff] [blame] | 1123 | smbd_disconnect_rdma_connection(info); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1124 | log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc); |
| 1125 | } |
| 1126 | |
| 1127 | return rc; |
| 1128 | } |
| 1129 | |
| 1130 | /* Perform SMBD negotiate according to [MS-SMBD] 3.1.5.2 */ |
| 1131 | static int smbd_negotiate(struct smbd_connection *info) |
| 1132 | { |
| 1133 | int rc; |
| 1134 | struct smbd_response *response = get_receive_buffer(info); |
| 1135 | |
| 1136 | response->type = SMBD_NEGOTIATE_RESP; |
| 1137 | rc = smbd_post_recv(info, response); |
| 1138 | log_rdma_event(INFO, |
| 1139 | "smbd_post_recv rc=%d iov.addr=%llx iov.length=%x " |
| 1140 | "iov.lkey=%x\n", |
| 1141 | rc, response->sge.addr, |
| 1142 | response->sge.length, response->sge.lkey); |
| 1143 | if (rc) |
| 1144 | return rc; |
| 1145 | |
| 1146 | init_completion(&info->negotiate_completion); |
| 1147 | info->negotiate_done = false; |
| 1148 | rc = smbd_post_send_negotiate_req(info); |
| 1149 | if (rc) |
| 1150 | return rc; |
| 1151 | |
| 1152 | rc = wait_for_completion_interruptible_timeout( |
| 1153 | &info->negotiate_completion, SMBD_NEGOTIATE_TIMEOUT * HZ); |
| 1154 | log_rdma_event(INFO, "wait_for_completion_timeout rc=%d\n", rc); |
| 1155 | |
| 1156 | if (info->negotiate_done) |
| 1157 | return 0; |
| 1158 | |
| 1159 | if (rc == 0) |
| 1160 | rc = -ETIMEDOUT; |
| 1161 | else if (rc == -ERESTARTSYS) |
| 1162 | rc = -EINTR; |
| 1163 | else |
| 1164 | rc = -ENOTCONN; |
| 1165 | |
| 1166 | return rc; |
| 1167 | } |
| 1168 | |
| 1169 | static void put_empty_packet( |
| 1170 | struct smbd_connection *info, struct smbd_response *response) |
| 1171 | { |
| 1172 | spin_lock(&info->empty_packet_queue_lock); |
| 1173 | list_add_tail(&response->list, &info->empty_packet_queue); |
| 1174 | info->count_empty_packet_queue++; |
| 1175 | spin_unlock(&info->empty_packet_queue_lock); |
| 1176 | |
| 1177 | queue_work(info->workqueue, &info->post_send_credits_work); |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1 |
| 1182 | * This is a queue for reassembling upper layer payload and present to upper |
| 1183 | * layer. All the inncoming payload go to the reassembly queue, regardless of |
| 1184 | * if reassembly is required. The uuper layer code reads from the queue for all |
| 1185 | * incoming payloads. |
| 1186 | * Put a received packet to the reassembly queue |
| 1187 | * response: the packet received |
| 1188 | * data_length: the size of payload in this packet |
| 1189 | */ |
| 1190 | static void enqueue_reassembly( |
| 1191 | struct smbd_connection *info, |
| 1192 | struct smbd_response *response, |
| 1193 | int data_length) |
| 1194 | { |
| 1195 | spin_lock(&info->reassembly_queue_lock); |
| 1196 | list_add_tail(&response->list, &info->reassembly_queue); |
| 1197 | info->reassembly_queue_length++; |
| 1198 | /* |
| 1199 | * Make sure reassembly_data_length is updated after list and |
| 1200 | * reassembly_queue_length are updated. On the dequeue side |
| 1201 | * reassembly_data_length is checked without a lock to determine |
| 1202 | * if reassembly_queue_length and list is up to date |
| 1203 | */ |
| 1204 | virt_wmb(); |
| 1205 | info->reassembly_data_length += data_length; |
| 1206 | spin_unlock(&info->reassembly_queue_lock); |
| 1207 | info->count_reassembly_queue++; |
| 1208 | info->count_enqueue_reassembly_queue++; |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * Get the first entry at the front of reassembly queue |
| 1213 | * Caller is responsible for locking |
| 1214 | * return value: the first entry if any, NULL if queue is empty |
| 1215 | */ |
| 1216 | static struct smbd_response *_get_first_reassembly(struct smbd_connection *info) |
| 1217 | { |
| 1218 | struct smbd_response *ret = NULL; |
| 1219 | |
| 1220 | if (!list_empty(&info->reassembly_queue)) { |
| 1221 | ret = list_first_entry( |
| 1222 | &info->reassembly_queue, |
| 1223 | struct smbd_response, list); |
| 1224 | } |
| 1225 | return ret; |
| 1226 | } |
| 1227 | |
| 1228 | static struct smbd_response *get_empty_queue_buffer( |
| 1229 | struct smbd_connection *info) |
| 1230 | { |
| 1231 | struct smbd_response *ret = NULL; |
| 1232 | unsigned long flags; |
| 1233 | |
| 1234 | spin_lock_irqsave(&info->empty_packet_queue_lock, flags); |
| 1235 | if (!list_empty(&info->empty_packet_queue)) { |
| 1236 | ret = list_first_entry( |
| 1237 | &info->empty_packet_queue, |
| 1238 | struct smbd_response, list); |
| 1239 | list_del(&ret->list); |
| 1240 | info->count_empty_packet_queue--; |
| 1241 | } |
| 1242 | spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags); |
| 1243 | |
| 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * Get a receive buffer |
| 1249 | * For each remote send, we need to post a receive. The receive buffers are |
| 1250 | * pre-allocated in advance. |
| 1251 | * return value: the receive buffer, NULL if none is available |
| 1252 | */ |
| 1253 | static struct smbd_response *get_receive_buffer(struct smbd_connection *info) |
| 1254 | { |
| 1255 | struct smbd_response *ret = NULL; |
| 1256 | unsigned long flags; |
| 1257 | |
| 1258 | spin_lock_irqsave(&info->receive_queue_lock, flags); |
| 1259 | if (!list_empty(&info->receive_queue)) { |
| 1260 | ret = list_first_entry( |
| 1261 | &info->receive_queue, |
| 1262 | struct smbd_response, list); |
| 1263 | list_del(&ret->list); |
| 1264 | info->count_receive_queue--; |
| 1265 | info->count_get_receive_buffer++; |
| 1266 | } |
| 1267 | spin_unlock_irqrestore(&info->receive_queue_lock, flags); |
| 1268 | |
| 1269 | return ret; |
| 1270 | } |
| 1271 | |
| 1272 | /* |
| 1273 | * Return a receive buffer |
| 1274 | * Upon returning of a receive buffer, we can post new receive and extend |
| 1275 | * more receive credits to remote peer. This is done immediately after a |
| 1276 | * receive buffer is returned. |
| 1277 | */ |
| 1278 | static void put_receive_buffer( |
| 1279 | struct smbd_connection *info, struct smbd_response *response) |
| 1280 | { |
| 1281 | unsigned long flags; |
| 1282 | |
| 1283 | ib_dma_unmap_single(info->id->device, response->sge.addr, |
| 1284 | response->sge.length, DMA_FROM_DEVICE); |
| 1285 | |
| 1286 | spin_lock_irqsave(&info->receive_queue_lock, flags); |
| 1287 | list_add_tail(&response->list, &info->receive_queue); |
| 1288 | info->count_receive_queue++; |
| 1289 | info->count_put_receive_buffer++; |
| 1290 | spin_unlock_irqrestore(&info->receive_queue_lock, flags); |
| 1291 | |
| 1292 | queue_work(info->workqueue, &info->post_send_credits_work); |
| 1293 | } |
| 1294 | |
| 1295 | /* Preallocate all receive buffer on transport establishment */ |
| 1296 | static int allocate_receive_buffers(struct smbd_connection *info, int num_buf) |
| 1297 | { |
| 1298 | int i; |
| 1299 | struct smbd_response *response; |
| 1300 | |
| 1301 | INIT_LIST_HEAD(&info->reassembly_queue); |
| 1302 | spin_lock_init(&info->reassembly_queue_lock); |
| 1303 | info->reassembly_data_length = 0; |
| 1304 | info->reassembly_queue_length = 0; |
| 1305 | |
| 1306 | INIT_LIST_HEAD(&info->receive_queue); |
| 1307 | spin_lock_init(&info->receive_queue_lock); |
| 1308 | info->count_receive_queue = 0; |
| 1309 | |
| 1310 | INIT_LIST_HEAD(&info->empty_packet_queue); |
| 1311 | spin_lock_init(&info->empty_packet_queue_lock); |
| 1312 | info->count_empty_packet_queue = 0; |
| 1313 | |
| 1314 | init_waitqueue_head(&info->wait_receive_queues); |
| 1315 | |
| 1316 | for (i = 0; i < num_buf; i++) { |
| 1317 | response = mempool_alloc(info->response_mempool, GFP_KERNEL); |
| 1318 | if (!response) |
| 1319 | goto allocate_failed; |
| 1320 | |
| 1321 | response->info = info; |
| 1322 | list_add_tail(&response->list, &info->receive_queue); |
| 1323 | info->count_receive_queue++; |
| 1324 | } |
| 1325 | |
| 1326 | return 0; |
| 1327 | |
| 1328 | allocate_failed: |
| 1329 | while (!list_empty(&info->receive_queue)) { |
| 1330 | response = list_first_entry( |
| 1331 | &info->receive_queue, |
| 1332 | struct smbd_response, list); |
| 1333 | list_del(&response->list); |
| 1334 | info->count_receive_queue--; |
| 1335 | |
| 1336 | mempool_free(response, info->response_mempool); |
| 1337 | } |
| 1338 | return -ENOMEM; |
| 1339 | } |
| 1340 | |
| 1341 | static void destroy_receive_buffers(struct smbd_connection *info) |
| 1342 | { |
| 1343 | struct smbd_response *response; |
| 1344 | |
| 1345 | while ((response = get_receive_buffer(info))) |
| 1346 | mempool_free(response, info->response_mempool); |
| 1347 | |
| 1348 | while ((response = get_empty_queue_buffer(info))) |
| 1349 | mempool_free(response, info->response_mempool); |
| 1350 | } |
| 1351 | |
| 1352 | /* |
| 1353 | * Check and send an immediate or keep alive packet |
| 1354 | * The condition to send those packets are defined in [MS-SMBD] 3.1.1.1 |
| 1355 | * Connection.KeepaliveRequested and Connection.SendImmediate |
| 1356 | * The idea is to extend credits to server as soon as it becomes available |
| 1357 | */ |
| 1358 | static void send_immediate_work(struct work_struct *work) |
| 1359 | { |
| 1360 | struct smbd_connection *info = container_of( |
| 1361 | work, struct smbd_connection, |
| 1362 | send_immediate_work.work); |
| 1363 | |
| 1364 | if (info->keep_alive_requested == KEEP_ALIVE_PENDING || |
| 1365 | info->send_immediate) { |
| 1366 | log_keep_alive(INFO, "send an empty message\n"); |
| 1367 | smbd_post_send_empty(info); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | /* Implement idle connection timer [MS-SMBD] 3.1.6.2 */ |
| 1372 | static void idle_connection_timer(struct work_struct *work) |
| 1373 | { |
| 1374 | struct smbd_connection *info = container_of( |
| 1375 | work, struct smbd_connection, |
| 1376 | idle_timer_work.work); |
| 1377 | |
| 1378 | if (info->keep_alive_requested != KEEP_ALIVE_NONE) { |
| 1379 | log_keep_alive(ERR, |
| 1380 | "error status info->keep_alive_requested=%d\n", |
| 1381 | info->keep_alive_requested); |
| 1382 | smbd_disconnect_rdma_connection(info); |
| 1383 | return; |
| 1384 | } |
| 1385 | |
| 1386 | log_keep_alive(INFO, "about to send an empty idle message\n"); |
| 1387 | smbd_post_send_empty(info); |
| 1388 | |
| 1389 | /* Setup the next idle timeout work */ |
| 1390 | queue_delayed_work(info->workqueue, &info->idle_timer_work, |
| 1391 | info->keep_alive_interval*HZ); |
| 1392 | } |
| 1393 | |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1394 | /* |
| 1395 | * Destroy the transport and related RDMA and memory resources |
| 1396 | * Need to go through all the pending counters and make sure on one is using |
| 1397 | * the transport while it is destroyed |
| 1398 | */ |
| 1399 | void smbd_destroy(struct TCP_Server_Info *server) |
Long Li | 8ef130f | 2017-11-22 17:38:37 -0700 | [diff] [blame] | 1400 | { |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1401 | struct smbd_connection *info = server->smbd_conn; |
| 1402 | struct smbd_response *response; |
| 1403 | unsigned long flags; |
| 1404 | |
| 1405 | if (!info) { |
| 1406 | log_rdma_event(INFO, "rdma session already destroyed\n"); |
| 1407 | return; |
| 1408 | } |
| 1409 | |
Long Li | 8ef130f | 2017-11-22 17:38:37 -0700 | [diff] [blame] | 1410 | log_rdma_event(INFO, "destroying rdma session\n"); |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1411 | if (info->transport_status != SMBD_DISCONNECTED) { |
| 1412 | rdma_disconnect(server->smbd_conn->id); |
| 1413 | log_rdma_event(INFO, "wait for transport being disconnected\n"); |
Long Li | e8b3bfe | 2019-04-05 21:36:31 +0000 | [diff] [blame] | 1414 | wait_event_interruptible( |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1415 | info->disconn_wait, |
| 1416 | info->transport_status == SMBD_DISCONNECTED); |
| 1417 | } |
Long Li | 8ef130f | 2017-11-22 17:38:37 -0700 | [diff] [blame] | 1418 | |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1419 | log_rdma_event(INFO, "destroying qp\n"); |
| 1420 | ib_drain_qp(info->id->qp); |
| 1421 | rdma_destroy_qp(info->id); |
Long Li | 8ef130f | 2017-11-22 17:38:37 -0700 | [diff] [blame] | 1422 | |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1423 | log_rdma_event(INFO, "cancelling idle timer\n"); |
| 1424 | cancel_delayed_work_sync(&info->idle_timer_work); |
| 1425 | log_rdma_event(INFO, "cancelling send immediate work\n"); |
| 1426 | cancel_delayed_work_sync(&info->send_immediate_work); |
| 1427 | |
| 1428 | log_rdma_event(INFO, "wait for all send posted to IB to finish\n"); |
| 1429 | wait_event(info->wait_send_pending, |
| 1430 | atomic_read(&info->send_pending) == 0); |
| 1431 | wait_event(info->wait_send_payload_pending, |
| 1432 | atomic_read(&info->send_payload_pending) == 0); |
| 1433 | |
| 1434 | /* It's not posssible for upper layer to get to reassembly */ |
| 1435 | log_rdma_event(INFO, "drain the reassembly queue\n"); |
| 1436 | do { |
| 1437 | spin_lock_irqsave(&info->reassembly_queue_lock, flags); |
| 1438 | response = _get_first_reassembly(info); |
| 1439 | if (response) { |
| 1440 | list_del(&response->list); |
| 1441 | spin_unlock_irqrestore( |
| 1442 | &info->reassembly_queue_lock, flags); |
| 1443 | put_receive_buffer(info, response); |
| 1444 | } else |
| 1445 | spin_unlock_irqrestore( |
| 1446 | &info->reassembly_queue_lock, flags); |
| 1447 | } while (response); |
| 1448 | info->reassembly_data_length = 0; |
| 1449 | |
| 1450 | log_rdma_event(INFO, "free receive buffers\n"); |
| 1451 | wait_event(info->wait_receive_queues, |
| 1452 | info->count_receive_queue + info->count_empty_packet_queue |
| 1453 | == info->receive_credit_max); |
| 1454 | destroy_receive_buffers(info); |
| 1455 | |
| 1456 | /* |
| 1457 | * For performance reasons, memory registration and deregistration |
| 1458 | * are not locked by srv_mutex. It is possible some processes are |
| 1459 | * blocked on transport srv_mutex while holding memory registration. |
| 1460 | * Release the transport srv_mutex to allow them to hit the failure |
| 1461 | * path when sending data, and then release memory registartions. |
| 1462 | */ |
| 1463 | log_rdma_event(INFO, "freeing mr list\n"); |
| 1464 | wake_up_interruptible_all(&info->wait_mr); |
| 1465 | while (atomic_read(&info->mr_used_count)) { |
| 1466 | mutex_unlock(&server->srv_mutex); |
| 1467 | msleep(1000); |
| 1468 | mutex_lock(&server->srv_mutex); |
| 1469 | } |
| 1470 | destroy_mr_list(info); |
| 1471 | |
| 1472 | ib_free_cq(info->send_cq); |
| 1473 | ib_free_cq(info->recv_cq); |
| 1474 | ib_dealloc_pd(info->pd); |
| 1475 | rdma_destroy_id(info->id); |
| 1476 | |
| 1477 | /* free mempools */ |
| 1478 | mempool_destroy(info->request_mempool); |
| 1479 | kmem_cache_destroy(info->request_cache); |
| 1480 | |
| 1481 | mempool_destroy(info->response_mempool); |
| 1482 | kmem_cache_destroy(info->response_cache); |
| 1483 | |
| 1484 | info->transport_status = SMBD_DESTROYED; |
Long Li | 8ef130f | 2017-11-22 17:38:37 -0700 | [diff] [blame] | 1485 | |
| 1486 | destroy_workqueue(info->workqueue); |
| 1487 | kfree(info); |
| 1488 | } |
| 1489 | |
Long Li | ad57b8e | 2017-11-22 17:38:35 -0700 | [diff] [blame] | 1490 | /* |
| 1491 | * Reconnect this SMBD connection, called from upper layer |
| 1492 | * return value: 0 on success, or actual error code |
| 1493 | */ |
| 1494 | int smbd_reconnect(struct TCP_Server_Info *server) |
| 1495 | { |
| 1496 | log_rdma_event(INFO, "reconnecting rdma session\n"); |
| 1497 | |
| 1498 | if (!server->smbd_conn) { |
Long Li | 48f238a | 2018-03-30 15:16:35 -0700 | [diff] [blame] | 1499 | log_rdma_event(INFO, "rdma session already destroyed\n"); |
| 1500 | goto create_conn; |
Long Li | ad57b8e | 2017-11-22 17:38:35 -0700 | [diff] [blame] | 1501 | } |
| 1502 | |
| 1503 | /* |
| 1504 | * This is possible if transport is disconnected and we haven't received |
| 1505 | * notification from RDMA, but upper layer has detected timeout |
| 1506 | */ |
| 1507 | if (server->smbd_conn->transport_status == SMBD_CONNECTED) { |
| 1508 | log_rdma_event(INFO, "disconnecting transport\n"); |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1509 | smbd_destroy(server); |
Long Li | ad57b8e | 2017-11-22 17:38:35 -0700 | [diff] [blame] | 1510 | } |
| 1511 | |
Long Li | 48f238a | 2018-03-30 15:16:35 -0700 | [diff] [blame] | 1512 | create_conn: |
Long Li | ad57b8e | 2017-11-22 17:38:35 -0700 | [diff] [blame] | 1513 | log_rdma_event(INFO, "creating rdma session\n"); |
| 1514 | server->smbd_conn = smbd_get_connection( |
| 1515 | server, (struct sockaddr *) &server->dstaddr); |
Long Li | 48f238a | 2018-03-30 15:16:35 -0700 | [diff] [blame] | 1516 | log_rdma_event(INFO, "created rdma session info=%p\n", |
| 1517 | server->smbd_conn); |
Long Li | ad57b8e | 2017-11-22 17:38:35 -0700 | [diff] [blame] | 1518 | |
| 1519 | return server->smbd_conn ? 0 : -ENOENT; |
| 1520 | } |
| 1521 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1522 | static void destroy_caches_and_workqueue(struct smbd_connection *info) |
| 1523 | { |
| 1524 | destroy_receive_buffers(info); |
| 1525 | destroy_workqueue(info->workqueue); |
| 1526 | mempool_destroy(info->response_mempool); |
| 1527 | kmem_cache_destroy(info->response_cache); |
| 1528 | mempool_destroy(info->request_mempool); |
| 1529 | kmem_cache_destroy(info->request_cache); |
| 1530 | } |
| 1531 | |
| 1532 | #define MAX_NAME_LEN 80 |
| 1533 | static int allocate_caches_and_workqueue(struct smbd_connection *info) |
| 1534 | { |
| 1535 | char name[MAX_NAME_LEN]; |
| 1536 | int rc; |
| 1537 | |
Ronnie Sahlberg | 74ea5f9 | 2019-02-09 09:51:11 +1000 | [diff] [blame] | 1538 | scnprintf(name, MAX_NAME_LEN, "smbd_request_%p", info); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1539 | info->request_cache = |
| 1540 | kmem_cache_create( |
| 1541 | name, |
| 1542 | sizeof(struct smbd_request) + |
| 1543 | sizeof(struct smbd_data_transfer), |
| 1544 | 0, SLAB_HWCACHE_ALIGN, NULL); |
| 1545 | if (!info->request_cache) |
| 1546 | return -ENOMEM; |
| 1547 | |
| 1548 | info->request_mempool = |
| 1549 | mempool_create(info->send_credit_target, mempool_alloc_slab, |
| 1550 | mempool_free_slab, info->request_cache); |
| 1551 | if (!info->request_mempool) |
| 1552 | goto out1; |
| 1553 | |
Ronnie Sahlberg | 74ea5f9 | 2019-02-09 09:51:11 +1000 | [diff] [blame] | 1554 | scnprintf(name, MAX_NAME_LEN, "smbd_response_%p", info); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1555 | info->response_cache = |
| 1556 | kmem_cache_create( |
| 1557 | name, |
| 1558 | sizeof(struct smbd_response) + |
| 1559 | info->max_receive_size, |
| 1560 | 0, SLAB_HWCACHE_ALIGN, NULL); |
| 1561 | if (!info->response_cache) |
| 1562 | goto out2; |
| 1563 | |
| 1564 | info->response_mempool = |
| 1565 | mempool_create(info->receive_credit_max, mempool_alloc_slab, |
| 1566 | mempool_free_slab, info->response_cache); |
| 1567 | if (!info->response_mempool) |
| 1568 | goto out3; |
| 1569 | |
Ronnie Sahlberg | 74ea5f9 | 2019-02-09 09:51:11 +1000 | [diff] [blame] | 1570 | scnprintf(name, MAX_NAME_LEN, "smbd_%p", info); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1571 | info->workqueue = create_workqueue(name); |
| 1572 | if (!info->workqueue) |
| 1573 | goto out4; |
| 1574 | |
| 1575 | rc = allocate_receive_buffers(info, info->receive_credit_max); |
| 1576 | if (rc) { |
| 1577 | log_rdma_event(ERR, "failed to allocate receive buffers\n"); |
| 1578 | goto out5; |
| 1579 | } |
| 1580 | |
| 1581 | return 0; |
| 1582 | |
| 1583 | out5: |
| 1584 | destroy_workqueue(info->workqueue); |
| 1585 | out4: |
| 1586 | mempool_destroy(info->response_mempool); |
| 1587 | out3: |
| 1588 | kmem_cache_destroy(info->response_cache); |
| 1589 | out2: |
| 1590 | mempool_destroy(info->request_mempool); |
| 1591 | out1: |
| 1592 | kmem_cache_destroy(info->request_cache); |
| 1593 | return -ENOMEM; |
| 1594 | } |
| 1595 | |
| 1596 | /* Create a SMBD connection, called by upper layer */ |
kbuild test robot | 9084432 | 2017-12-18 21:30:06 +0800 | [diff] [blame] | 1597 | static struct smbd_connection *_smbd_get_connection( |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1598 | struct TCP_Server_Info *server, struct sockaddr *dstaddr, int port) |
| 1599 | { |
| 1600 | int rc; |
| 1601 | struct smbd_connection *info; |
| 1602 | struct rdma_conn_param conn_param; |
| 1603 | struct ib_qp_init_attr qp_attr; |
| 1604 | struct sockaddr_in *addr_in = (struct sockaddr_in *) dstaddr; |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1605 | struct ib_port_immutable port_immutable; |
| 1606 | u32 ird_ord_hdr[2]; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1607 | |
| 1608 | info = kzalloc(sizeof(struct smbd_connection), GFP_KERNEL); |
| 1609 | if (!info) |
| 1610 | return NULL; |
| 1611 | |
| 1612 | info->transport_status = SMBD_CONNECTING; |
| 1613 | rc = smbd_ia_open(info, dstaddr, port); |
| 1614 | if (rc) { |
| 1615 | log_rdma_event(INFO, "smbd_ia_open rc=%d\n", rc); |
| 1616 | goto create_id_failed; |
| 1617 | } |
| 1618 | |
| 1619 | if (smbd_send_credit_target > info->id->device->attrs.max_cqe || |
| 1620 | smbd_send_credit_target > info->id->device->attrs.max_qp_wr) { |
| 1621 | log_rdma_event(ERR, |
| 1622 | "consider lowering send_credit_target = %d. " |
| 1623 | "Possible CQE overrun, device " |
| 1624 | "reporting max_cpe %d max_qp_wr %d\n", |
| 1625 | smbd_send_credit_target, |
| 1626 | info->id->device->attrs.max_cqe, |
| 1627 | info->id->device->attrs.max_qp_wr); |
| 1628 | goto config_failed; |
| 1629 | } |
| 1630 | |
| 1631 | if (smbd_receive_credit_max > info->id->device->attrs.max_cqe || |
| 1632 | smbd_receive_credit_max > info->id->device->attrs.max_qp_wr) { |
| 1633 | log_rdma_event(ERR, |
| 1634 | "consider lowering receive_credit_max = %d. " |
| 1635 | "Possible CQE overrun, device " |
| 1636 | "reporting max_cpe %d max_qp_wr %d\n", |
| 1637 | smbd_receive_credit_max, |
| 1638 | info->id->device->attrs.max_cqe, |
| 1639 | info->id->device->attrs.max_qp_wr); |
| 1640 | goto config_failed; |
| 1641 | } |
| 1642 | |
| 1643 | info->receive_credit_max = smbd_receive_credit_max; |
| 1644 | info->send_credit_target = smbd_send_credit_target; |
| 1645 | info->max_send_size = smbd_max_send_size; |
| 1646 | info->max_fragmented_recv_size = smbd_max_fragmented_recv_size; |
| 1647 | info->max_receive_size = smbd_max_receive_size; |
| 1648 | info->keep_alive_interval = smbd_keep_alive_interval; |
| 1649 | |
Steve Wise | 33023fb | 2018-06-18 08:05:26 -0700 | [diff] [blame] | 1650 | if (info->id->device->attrs.max_send_sge < SMBDIRECT_MAX_SGE) { |
| 1651 | log_rdma_event(ERR, |
| 1652 | "warning: device max_send_sge = %d too small\n", |
| 1653 | info->id->device->attrs.max_send_sge); |
| 1654 | log_rdma_event(ERR, "Queue Pair creation may fail\n"); |
| 1655 | } |
| 1656 | if (info->id->device->attrs.max_recv_sge < SMBDIRECT_MAX_SGE) { |
| 1657 | log_rdma_event(ERR, |
| 1658 | "warning: device max_recv_sge = %d too small\n", |
| 1659 | info->id->device->attrs.max_recv_sge); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1660 | log_rdma_event(ERR, "Queue Pair creation may fail\n"); |
| 1661 | } |
| 1662 | |
| 1663 | info->send_cq = NULL; |
| 1664 | info->recv_cq = NULL; |
| 1665 | info->send_cq = ib_alloc_cq(info->id->device, info, |
| 1666 | info->send_credit_target, 0, IB_POLL_SOFTIRQ); |
| 1667 | if (IS_ERR(info->send_cq)) { |
| 1668 | info->send_cq = NULL; |
| 1669 | goto alloc_cq_failed; |
| 1670 | } |
| 1671 | |
| 1672 | info->recv_cq = ib_alloc_cq(info->id->device, info, |
| 1673 | info->receive_credit_max, 0, IB_POLL_SOFTIRQ); |
| 1674 | if (IS_ERR(info->recv_cq)) { |
| 1675 | info->recv_cq = NULL; |
| 1676 | goto alloc_cq_failed; |
| 1677 | } |
| 1678 | |
| 1679 | memset(&qp_attr, 0, sizeof(qp_attr)); |
| 1680 | qp_attr.event_handler = smbd_qp_async_error_upcall; |
| 1681 | qp_attr.qp_context = info; |
| 1682 | qp_attr.cap.max_send_wr = info->send_credit_target; |
| 1683 | qp_attr.cap.max_recv_wr = info->receive_credit_max; |
| 1684 | qp_attr.cap.max_send_sge = SMBDIRECT_MAX_SGE; |
| 1685 | qp_attr.cap.max_recv_sge = SMBDIRECT_MAX_SGE; |
| 1686 | qp_attr.cap.max_inline_data = 0; |
| 1687 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
| 1688 | qp_attr.qp_type = IB_QPT_RC; |
| 1689 | qp_attr.send_cq = info->send_cq; |
| 1690 | qp_attr.recv_cq = info->recv_cq; |
| 1691 | qp_attr.port_num = ~0; |
| 1692 | |
| 1693 | rc = rdma_create_qp(info->id, info->pd, &qp_attr); |
| 1694 | if (rc) { |
| 1695 | log_rdma_event(ERR, "rdma_create_qp failed %i\n", rc); |
| 1696 | goto create_qp_failed; |
| 1697 | } |
| 1698 | |
| 1699 | memset(&conn_param, 0, sizeof(conn_param)); |
| 1700 | conn_param.initiator_depth = 0; |
| 1701 | |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1702 | conn_param.responder_resources = |
| 1703 | info->id->device->attrs.max_qp_rd_atom |
| 1704 | < SMBD_CM_RESPONDER_RESOURCES ? |
| 1705 | info->id->device->attrs.max_qp_rd_atom : |
| 1706 | SMBD_CM_RESPONDER_RESOURCES; |
| 1707 | info->responder_resources = conn_param.responder_resources; |
| 1708 | log_rdma_mr(INFO, "responder_resources=%d\n", |
| 1709 | info->responder_resources); |
| 1710 | |
| 1711 | /* Need to send IRD/ORD in private data for iWARP */ |
Kamal Heib | 3023a1e | 2018-12-10 21:09:48 +0200 | [diff] [blame] | 1712 | info->id->device->ops.get_port_immutable( |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1713 | info->id->device, info->id->port_num, &port_immutable); |
| 1714 | if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { |
| 1715 | ird_ord_hdr[0] = info->responder_resources; |
| 1716 | ird_ord_hdr[1] = 1; |
| 1717 | conn_param.private_data = ird_ord_hdr; |
| 1718 | conn_param.private_data_len = sizeof(ird_ord_hdr); |
| 1719 | } else { |
| 1720 | conn_param.private_data = NULL; |
| 1721 | conn_param.private_data_len = 0; |
| 1722 | } |
| 1723 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1724 | conn_param.retry_count = SMBD_CM_RETRY; |
| 1725 | conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY; |
| 1726 | conn_param.flow_control = 0; |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1727 | |
| 1728 | log_rdma_event(INFO, "connecting to IP %pI4 port %d\n", |
| 1729 | &addr_in->sin_addr, port); |
| 1730 | |
| 1731 | init_waitqueue_head(&info->conn_wait); |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1732 | init_waitqueue_head(&info->disconn_wait); |
| 1733 | init_waitqueue_head(&info->wait_reassembly_queue); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1734 | rc = rdma_connect(info->id, &conn_param); |
| 1735 | if (rc) { |
| 1736 | log_rdma_event(ERR, "rdma_connect() failed with %i\n", rc); |
| 1737 | goto rdma_connect_failed; |
| 1738 | } |
| 1739 | |
| 1740 | wait_event_interruptible( |
| 1741 | info->conn_wait, info->transport_status != SMBD_CONNECTING); |
| 1742 | |
| 1743 | if (info->transport_status != SMBD_CONNECTED) { |
| 1744 | log_rdma_event(ERR, "rdma_connect failed port=%d\n", port); |
| 1745 | goto rdma_connect_failed; |
| 1746 | } |
| 1747 | |
| 1748 | log_rdma_event(INFO, "rdma_connect connected\n"); |
| 1749 | |
| 1750 | rc = allocate_caches_and_workqueue(info); |
| 1751 | if (rc) { |
| 1752 | log_rdma_event(ERR, "cache allocation failed\n"); |
| 1753 | goto allocate_cache_failed; |
| 1754 | } |
| 1755 | |
| 1756 | init_waitqueue_head(&info->wait_send_queue); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1757 | INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer); |
| 1758 | INIT_DELAYED_WORK(&info->send_immediate_work, send_immediate_work); |
| 1759 | queue_delayed_work(info->workqueue, &info->idle_timer_work, |
| 1760 | info->keep_alive_interval*HZ); |
| 1761 | |
| 1762 | init_waitqueue_head(&info->wait_send_pending); |
| 1763 | atomic_set(&info->send_pending, 0); |
| 1764 | |
| 1765 | init_waitqueue_head(&info->wait_send_payload_pending); |
| 1766 | atomic_set(&info->send_payload_pending, 0); |
| 1767 | |
| 1768 | INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work); |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1769 | INIT_WORK(&info->recv_done_work, smbd_recv_done_work); |
| 1770 | INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits); |
| 1771 | info->new_credits_offered = 0; |
| 1772 | spin_lock_init(&info->lock_new_credits_offered); |
| 1773 | |
| 1774 | rc = smbd_negotiate(info); |
| 1775 | if (rc) { |
| 1776 | log_rdma_event(ERR, "smbd_negotiate rc=%d\n", rc); |
| 1777 | goto negotiation_failed; |
| 1778 | } |
| 1779 | |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1780 | rc = allocate_mr_list(info); |
| 1781 | if (rc) { |
| 1782 | log_rdma_mr(ERR, "memory registration allocation failed\n"); |
| 1783 | goto allocate_mr_failed; |
| 1784 | } |
| 1785 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1786 | return info; |
| 1787 | |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1788 | allocate_mr_failed: |
| 1789 | /* At this point, need to a full transport shutdown */ |
Long Li | 050b8c3 | 2019-04-04 11:35:42 -0500 | [diff] [blame] | 1790 | smbd_destroy(server); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 1791 | return NULL; |
| 1792 | |
Long Li | f198186 | 2017-11-04 18:17:24 -0700 | [diff] [blame] | 1793 | negotiation_failed: |
| 1794 | cancel_delayed_work_sync(&info->idle_timer_work); |
| 1795 | destroy_caches_and_workqueue(info); |
| 1796 | info->transport_status = SMBD_NEGOTIATE_FAILED; |
| 1797 | init_waitqueue_head(&info->conn_wait); |
| 1798 | rdma_disconnect(info->id); |
| 1799 | wait_event(info->conn_wait, |
| 1800 | info->transport_status == SMBD_DISCONNECTED); |
| 1801 | |
| 1802 | allocate_cache_failed: |
| 1803 | rdma_connect_failed: |
| 1804 | rdma_destroy_qp(info->id); |
| 1805 | |
| 1806 | create_qp_failed: |
| 1807 | alloc_cq_failed: |
| 1808 | if (info->send_cq) |
| 1809 | ib_free_cq(info->send_cq); |
| 1810 | if (info->recv_cq) |
| 1811 | ib_free_cq(info->recv_cq); |
| 1812 | |
| 1813 | config_failed: |
| 1814 | ib_dealloc_pd(info->pd); |
| 1815 | rdma_destroy_id(info->id); |
| 1816 | |
| 1817 | create_id_failed: |
| 1818 | kfree(info); |
| 1819 | return NULL; |
| 1820 | } |
Long Li | 399f953 | 2017-11-17 17:26:52 -0800 | [diff] [blame] | 1821 | |
| 1822 | struct smbd_connection *smbd_get_connection( |
| 1823 | struct TCP_Server_Info *server, struct sockaddr *dstaddr) |
| 1824 | { |
| 1825 | struct smbd_connection *ret; |
| 1826 | int port = SMBD_PORT; |
| 1827 | |
| 1828 | try_again: |
| 1829 | ret = _smbd_get_connection(server, dstaddr, port); |
| 1830 | |
| 1831 | /* Try SMB_PORT if SMBD_PORT doesn't work */ |
| 1832 | if (!ret && port == SMBD_PORT) { |
| 1833 | port = SMB_PORT; |
| 1834 | goto try_again; |
| 1835 | } |
| 1836 | return ret; |
| 1837 | } |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1838 | |
| 1839 | /* |
| 1840 | * Receive data from receive reassembly queue |
| 1841 | * All the incoming data packets are placed in reassembly queue |
| 1842 | * buf: the buffer to read data into |
| 1843 | * size: the length of data to read |
| 1844 | * return value: actual data read |
| 1845 | * Note: this implementation copies the data from reassebmly queue to receive |
| 1846 | * buffers used by upper layer. This is not the optimal code path. A better way |
| 1847 | * to do it is to not have upper layer allocate its receive buffers but rather |
| 1848 | * borrow the buffer from reassembly queue, and return it after data is |
| 1849 | * consumed. But this will require more changes to upper layer code, and also |
| 1850 | * need to consider packet boundaries while they still being reassembled. |
| 1851 | */ |
Steve French | 2026b06 | 2018-01-24 23:07:41 -0600 | [diff] [blame] | 1852 | static int smbd_recv_buf(struct smbd_connection *info, char *buf, |
| 1853 | unsigned int size) |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1854 | { |
| 1855 | struct smbd_response *response; |
| 1856 | struct smbd_data_transfer *data_transfer; |
| 1857 | int to_copy, to_read, data_read, offset; |
| 1858 | u32 data_length, remaining_data_length, data_offset; |
| 1859 | int rc; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1860 | |
| 1861 | again: |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1862 | /* |
| 1863 | * No need to hold the reassembly queue lock all the time as we are |
| 1864 | * the only one reading from the front of the queue. The transport |
| 1865 | * may add more entries to the back of the queue at the same time |
| 1866 | */ |
| 1867 | log_read(INFO, "size=%d info->reassembly_data_length=%d\n", size, |
| 1868 | info->reassembly_data_length); |
| 1869 | if (info->reassembly_data_length >= size) { |
| 1870 | int queue_length; |
| 1871 | int queue_removed = 0; |
| 1872 | |
| 1873 | /* |
| 1874 | * Need to make sure reassembly_data_length is read before |
| 1875 | * reading reassembly_queue_length and calling |
| 1876 | * _get_first_reassembly. This call is lock free |
| 1877 | * as we never read at the end of the queue which are being |
| 1878 | * updated in SOFTIRQ as more data is received |
| 1879 | */ |
| 1880 | virt_rmb(); |
| 1881 | queue_length = info->reassembly_queue_length; |
| 1882 | data_read = 0; |
| 1883 | to_read = size; |
| 1884 | offset = info->first_entry_offset; |
| 1885 | while (data_read < size) { |
| 1886 | response = _get_first_reassembly(info); |
| 1887 | data_transfer = smbd_response_payload(response); |
| 1888 | data_length = le32_to_cpu(data_transfer->data_length); |
| 1889 | remaining_data_length = |
| 1890 | le32_to_cpu( |
| 1891 | data_transfer->remaining_data_length); |
| 1892 | data_offset = le32_to_cpu(data_transfer->data_offset); |
| 1893 | |
| 1894 | /* |
| 1895 | * The upper layer expects RFC1002 length at the |
| 1896 | * beginning of the payload. Return it to indicate |
| 1897 | * the total length of the packet. This minimize the |
| 1898 | * change to upper layer packet processing logic. This |
| 1899 | * will be eventually remove when an intermediate |
| 1900 | * transport layer is added |
| 1901 | */ |
| 1902 | if (response->first_segment && size == 4) { |
| 1903 | unsigned int rfc1002_len = |
| 1904 | data_length + remaining_data_length; |
| 1905 | *((__be32 *)buf) = cpu_to_be32(rfc1002_len); |
| 1906 | data_read = 4; |
| 1907 | response->first_segment = false; |
| 1908 | log_read(INFO, "returning rfc1002 length %d\n", |
| 1909 | rfc1002_len); |
| 1910 | goto read_rfc1002_done; |
| 1911 | } |
| 1912 | |
| 1913 | to_copy = min_t(int, data_length - offset, to_read); |
| 1914 | memcpy( |
| 1915 | buf + data_read, |
| 1916 | (char *)data_transfer + data_offset + offset, |
| 1917 | to_copy); |
| 1918 | |
| 1919 | /* move on to the next buffer? */ |
| 1920 | if (to_copy == data_length - offset) { |
| 1921 | queue_length--; |
| 1922 | /* |
| 1923 | * No need to lock if we are not at the |
| 1924 | * end of the queue |
| 1925 | */ |
Steve French | f9de151 | 2018-02-03 19:45:07 -0600 | [diff] [blame] | 1926 | if (queue_length) |
| 1927 | list_del(&response->list); |
| 1928 | else { |
Arnd Bergmann | e36c048 | 2018-01-10 21:51:05 +0100 | [diff] [blame] | 1929 | spin_lock_irq( |
| 1930 | &info->reassembly_queue_lock); |
Steve French | f9de151 | 2018-02-03 19:45:07 -0600 | [diff] [blame] | 1931 | list_del(&response->list); |
Arnd Bergmann | e36c048 | 2018-01-10 21:51:05 +0100 | [diff] [blame] | 1932 | spin_unlock_irq( |
| 1933 | &info->reassembly_queue_lock); |
Steve French | f9de151 | 2018-02-03 19:45:07 -0600 | [diff] [blame] | 1934 | } |
| 1935 | queue_removed++; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1936 | info->count_reassembly_queue--; |
| 1937 | info->count_dequeue_reassembly_queue++; |
| 1938 | put_receive_buffer(info, response); |
| 1939 | offset = 0; |
| 1940 | log_read(INFO, "put_receive_buffer offset=0\n"); |
| 1941 | } else |
| 1942 | offset += to_copy; |
| 1943 | |
| 1944 | to_read -= to_copy; |
| 1945 | data_read += to_copy; |
| 1946 | |
| 1947 | log_read(INFO, "_get_first_reassembly memcpy %d bytes " |
| 1948 | "data_transfer_length-offset=%d after that " |
| 1949 | "to_read=%d data_read=%d offset=%d\n", |
| 1950 | to_copy, data_length - offset, |
| 1951 | to_read, data_read, offset); |
| 1952 | } |
| 1953 | |
Arnd Bergmann | e36c048 | 2018-01-10 21:51:05 +0100 | [diff] [blame] | 1954 | spin_lock_irq(&info->reassembly_queue_lock); |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1955 | info->reassembly_data_length -= data_read; |
| 1956 | info->reassembly_queue_length -= queue_removed; |
Arnd Bergmann | e36c048 | 2018-01-10 21:51:05 +0100 | [diff] [blame] | 1957 | spin_unlock_irq(&info->reassembly_queue_lock); |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1958 | |
| 1959 | info->first_entry_offset = offset; |
| 1960 | log_read(INFO, "returning to thread data_read=%d " |
| 1961 | "reassembly_data_length=%d first_entry_offset=%d\n", |
| 1962 | data_read, info->reassembly_data_length, |
| 1963 | info->first_entry_offset); |
| 1964 | read_rfc1002_done: |
| 1965 | return data_read; |
| 1966 | } |
| 1967 | |
| 1968 | log_read(INFO, "wait_event on more data\n"); |
| 1969 | rc = wait_event_interruptible( |
| 1970 | info->wait_reassembly_queue, |
| 1971 | info->reassembly_data_length >= size || |
| 1972 | info->transport_status != SMBD_CONNECTED); |
| 1973 | /* Don't return any data if interrupted */ |
| 1974 | if (rc) |
Long Li | 98e0d40 | 2019-04-05 21:36:32 +0000 | [diff] [blame^] | 1975 | return rc; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1976 | |
Long Li | e8b3bfe | 2019-04-05 21:36:31 +0000 | [diff] [blame] | 1977 | if (info->transport_status != SMBD_CONNECTED) { |
| 1978 | log_read(ERR, "disconnected\n"); |
| 1979 | return 0; |
| 1980 | } |
| 1981 | |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1982 | goto again; |
| 1983 | } |
| 1984 | |
| 1985 | /* |
| 1986 | * Receive a page from receive reassembly queue |
| 1987 | * page: the page to read data into |
| 1988 | * to_read: the length of data to read |
| 1989 | * return value: actual data read |
| 1990 | */ |
Steve French | 2026b06 | 2018-01-24 23:07:41 -0600 | [diff] [blame] | 1991 | static int smbd_recv_page(struct smbd_connection *info, |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 1992 | struct page *page, unsigned int page_offset, |
| 1993 | unsigned int to_read) |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1994 | { |
| 1995 | int ret; |
| 1996 | char *to_address; |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 1997 | void *page_address; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 1998 | |
| 1999 | /* make sure we have the page ready for read */ |
| 2000 | ret = wait_event_interruptible( |
| 2001 | info->wait_reassembly_queue, |
| 2002 | info->reassembly_data_length >= to_read || |
| 2003 | info->transport_status != SMBD_CONNECTED); |
| 2004 | if (ret) |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2005 | return ret; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2006 | |
| 2007 | /* now we can read from reassembly queue and not sleep */ |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2008 | page_address = kmap_atomic(page); |
| 2009 | to_address = (char *) page_address + page_offset; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2010 | |
| 2011 | log_read(INFO, "reading from page=%p address=%p to_read=%d\n", |
| 2012 | page, to_address, to_read); |
| 2013 | |
| 2014 | ret = smbd_recv_buf(info, to_address, to_read); |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2015 | kunmap_atomic(page_address); |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2016 | |
| 2017 | return ret; |
| 2018 | } |
| 2019 | |
| 2020 | /* |
| 2021 | * Receive data from transport |
| 2022 | * msg: a msghdr point to the buffer, can be ITER_KVEC or ITER_BVEC |
| 2023 | * return: total bytes read, or 0. SMB Direct will not do partial read. |
| 2024 | */ |
| 2025 | int smbd_recv(struct smbd_connection *info, struct msghdr *msg) |
| 2026 | { |
| 2027 | char *buf; |
| 2028 | struct page *page; |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2029 | unsigned int to_read, page_offset; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2030 | int rc; |
| 2031 | |
David Howells | 00e2370 | 2018-10-22 13:07:28 +0100 | [diff] [blame] | 2032 | if (iov_iter_rw(&msg->msg_iter) == WRITE) { |
| 2033 | /* It's a bug in upper layer to get there */ |
| 2034 | cifs_dbg(VFS, "CIFS: invalid msg iter dir %u\n", |
| 2035 | iov_iter_rw(&msg->msg_iter)); |
| 2036 | rc = -EINVAL; |
| 2037 | goto out; |
| 2038 | } |
| 2039 | |
| 2040 | switch (iov_iter_type(&msg->msg_iter)) { |
| 2041 | case ITER_KVEC: |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2042 | buf = msg->msg_iter.kvec->iov_base; |
| 2043 | to_read = msg->msg_iter.kvec->iov_len; |
| 2044 | rc = smbd_recv_buf(info, buf, to_read); |
| 2045 | break; |
| 2046 | |
David Howells | 00e2370 | 2018-10-22 13:07:28 +0100 | [diff] [blame] | 2047 | case ITER_BVEC: |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2048 | page = msg->msg_iter.bvec->bv_page; |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2049 | page_offset = msg->msg_iter.bvec->bv_offset; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2050 | to_read = msg->msg_iter.bvec->bv_len; |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2051 | rc = smbd_recv_page(info, page, page_offset, to_read); |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2052 | break; |
| 2053 | |
| 2054 | default: |
| 2055 | /* It's a bug in upper layer to get there */ |
| 2056 | cifs_dbg(VFS, "CIFS: invalid msg type %d\n", |
David Howells | 00e2370 | 2018-10-22 13:07:28 +0100 | [diff] [blame] | 2057 | iov_iter_type(&msg->msg_iter)); |
Long Li | 6509f50 | 2018-05-30 12:48:01 -0700 | [diff] [blame] | 2058 | rc = -EINVAL; |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2059 | } |
| 2060 | |
David Howells | 00e2370 | 2018-10-22 13:07:28 +0100 | [diff] [blame] | 2061 | out: |
Long Li | f64b78f | 2017-11-22 17:38:40 -0700 | [diff] [blame] | 2062 | /* SMBDirect will read it all or nothing */ |
| 2063 | if (rc > 0) |
| 2064 | msg->msg_iter.count = 0; |
| 2065 | return rc; |
| 2066 | } |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2067 | |
| 2068 | /* |
| 2069 | * Send data to transport |
| 2070 | * Each rqst is transported as a SMBDirect payload |
| 2071 | * rqst: the data to write |
| 2072 | * return value: 0 if successfully write, otherwise error code |
| 2073 | */ |
Ronnie Sahlberg | 81f39f9 | 2018-06-28 10:47:14 +1000 | [diff] [blame] | 2074 | int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2075 | { |
Ronnie Sahlberg | 81f39f9 | 2018-06-28 10:47:14 +1000 | [diff] [blame] | 2076 | struct smbd_connection *info = server->smbd_conn; |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2077 | struct kvec vec; |
| 2078 | int nvecs; |
| 2079 | int size; |
Paulo Alcantara | 35e2cc1 | 2018-06-15 10:22:44 -0300 | [diff] [blame] | 2080 | unsigned int buflen, remaining_data_length; |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2081 | int start, i, j; |
| 2082 | int max_iov_size = |
| 2083 | info->max_send_size - sizeof(struct smbd_data_transfer); |
Long Li | 8bcda1d | 2018-04-17 12:17:07 -0700 | [diff] [blame] | 2084 | struct kvec *iov; |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2085 | int rc; |
| 2086 | |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2087 | if (info->transport_status != SMBD_CONNECTED) { |
| 2088 | rc = -ENODEV; |
| 2089 | goto done; |
| 2090 | } |
| 2091 | |
| 2092 | /* |
Long Li | 8bcda1d | 2018-04-17 12:17:07 -0700 | [diff] [blame] | 2093 | * Skip the RFC1002 length defined in MS-SMB2 section 2.1 |
| 2094 | * It is used only for TCP transport in the iov[0] |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2095 | * In future we may want to add a transport layer under protocol |
| 2096 | * layer so this will only be issued to TCP transport |
| 2097 | */ |
Long Li | 8bcda1d | 2018-04-17 12:17:07 -0700 | [diff] [blame] | 2098 | |
| 2099 | if (rqst->rq_iov[0].iov_len != 4) { |
| 2100 | log_write(ERR, "expected the pdu length in 1st iov, but got %zu\n", rqst->rq_iov[0].iov_len); |
| 2101 | return -EINVAL; |
| 2102 | } |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2103 | |
Long Li | b6903bc | 2018-05-30 12:48:00 -0700 | [diff] [blame] | 2104 | /* |
| 2105 | * Add in the page array if there is one. The caller needs to set |
| 2106 | * rq_tailsz to PAGE_SIZE when the buffer has multiple pages and |
| 2107 | * ends at page boundary |
| 2108 | */ |
Ronnie Sahlberg | 81f39f9 | 2018-06-28 10:47:14 +1000 | [diff] [blame] | 2109 | buflen = smb_rqst_len(server, rqst); |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2110 | |
| 2111 | if (buflen + sizeof(struct smbd_data_transfer) > |
| 2112 | info->max_fragmented_send_size) { |
| 2113 | log_write(ERR, "payload size %d > max size %d\n", |
| 2114 | buflen, info->max_fragmented_send_size); |
| 2115 | rc = -EINVAL; |
| 2116 | goto done; |
| 2117 | } |
| 2118 | |
Paulo Alcantara | 35e2cc1 | 2018-06-15 10:22:44 -0300 | [diff] [blame] | 2119 | iov = &rqst->rq_iov[1]; |
| 2120 | |
Long Li | ff30b89 | 2018-04-17 12:17:10 -0700 | [diff] [blame] | 2121 | cifs_dbg(FYI, "Sending smb (RDMA): smb_len=%u\n", buflen); |
| 2122 | for (i = 0; i < rqst->rq_nvec-1; i++) |
| 2123 | dump_smb(iov[i].iov_base, iov[i].iov_len); |
| 2124 | |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2125 | remaining_data_length = buflen; |
| 2126 | |
| 2127 | log_write(INFO, "rqst->rq_nvec=%d rqst->rq_npages=%d rq_pagesz=%d " |
| 2128 | "rq_tailsz=%d buflen=%d\n", |
| 2129 | rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz, |
| 2130 | rqst->rq_tailsz, buflen); |
| 2131 | |
| 2132 | start = i = iov[0].iov_len ? 0 : 1; |
| 2133 | buflen = 0; |
| 2134 | while (true) { |
| 2135 | buflen += iov[i].iov_len; |
| 2136 | if (buflen > max_iov_size) { |
| 2137 | if (i > start) { |
| 2138 | remaining_data_length -= |
| 2139 | (buflen-iov[i].iov_len); |
| 2140 | log_write(INFO, "sending iov[] from start=%d " |
| 2141 | "i=%d nvecs=%d " |
| 2142 | "remaining_data_length=%d\n", |
| 2143 | start, i, i-start, |
| 2144 | remaining_data_length); |
| 2145 | rc = smbd_post_send_data( |
| 2146 | info, &iov[start], i-start, |
| 2147 | remaining_data_length); |
| 2148 | if (rc) |
| 2149 | goto done; |
| 2150 | } else { |
| 2151 | /* iov[start] is too big, break it */ |
| 2152 | nvecs = (buflen+max_iov_size-1)/max_iov_size; |
| 2153 | log_write(INFO, "iov[%d] iov_base=%p buflen=%d" |
| 2154 | " break to %d vectors\n", |
| 2155 | start, iov[start].iov_base, |
| 2156 | buflen, nvecs); |
| 2157 | for (j = 0; j < nvecs; j++) { |
| 2158 | vec.iov_base = |
| 2159 | (char *)iov[start].iov_base + |
| 2160 | j*max_iov_size; |
| 2161 | vec.iov_len = max_iov_size; |
| 2162 | if (j == nvecs-1) |
| 2163 | vec.iov_len = |
| 2164 | buflen - |
| 2165 | max_iov_size*(nvecs-1); |
| 2166 | remaining_data_length -= vec.iov_len; |
| 2167 | log_write(INFO, |
| 2168 | "sending vec j=%d iov_base=%p" |
| 2169 | " iov_len=%zu " |
| 2170 | "remaining_data_length=%d\n", |
| 2171 | j, vec.iov_base, vec.iov_len, |
| 2172 | remaining_data_length); |
| 2173 | rc = smbd_post_send_data( |
| 2174 | info, &vec, 1, |
| 2175 | remaining_data_length); |
| 2176 | if (rc) |
| 2177 | goto done; |
| 2178 | } |
| 2179 | i++; |
Long Li | 8bcda1d | 2018-04-17 12:17:07 -0700 | [diff] [blame] | 2180 | if (i == rqst->rq_nvec-1) |
Long Li | ab60ee7 | 2018-04-17 12:17:05 -0700 | [diff] [blame] | 2181 | break; |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2182 | } |
| 2183 | start = i; |
| 2184 | buflen = 0; |
| 2185 | } else { |
| 2186 | i++; |
Long Li | 8bcda1d | 2018-04-17 12:17:07 -0700 | [diff] [blame] | 2187 | if (i == rqst->rq_nvec-1) { |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2188 | /* send out all remaining vecs */ |
| 2189 | remaining_data_length -= buflen; |
| 2190 | log_write(INFO, |
| 2191 | "sending iov[] from start=%d i=%d " |
| 2192 | "nvecs=%d remaining_data_length=%d\n", |
| 2193 | start, i, i-start, |
| 2194 | remaining_data_length); |
| 2195 | rc = smbd_post_send_data(info, &iov[start], |
| 2196 | i-start, remaining_data_length); |
| 2197 | if (rc) |
| 2198 | goto done; |
| 2199 | break; |
| 2200 | } |
| 2201 | } |
| 2202 | log_write(INFO, "looping i=%d buflen=%d\n", i, buflen); |
| 2203 | } |
| 2204 | |
| 2205 | /* now sending pages if there are any */ |
| 2206 | for (i = 0; i < rqst->rq_npages; i++) { |
Long Li | b6903bc | 2018-05-30 12:48:00 -0700 | [diff] [blame] | 2207 | unsigned int offset; |
| 2208 | |
| 2209 | rqst_page_get_length(rqst, i, &buflen, &offset); |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2210 | nvecs = (buflen + max_iov_size - 1) / max_iov_size; |
| 2211 | log_write(INFO, "sending pages buflen=%d nvecs=%d\n", |
| 2212 | buflen, nvecs); |
| 2213 | for (j = 0; j < nvecs; j++) { |
| 2214 | size = max_iov_size; |
| 2215 | if (j == nvecs-1) |
| 2216 | size = buflen - j*max_iov_size; |
| 2217 | remaining_data_length -= size; |
| 2218 | log_write(INFO, "sending pages i=%d offset=%d size=%d" |
| 2219 | " remaining_data_length=%d\n", |
Long Li | b6903bc | 2018-05-30 12:48:00 -0700 | [diff] [blame] | 2220 | i, j*max_iov_size+offset, size, |
| 2221 | remaining_data_length); |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2222 | rc = smbd_post_send_page( |
Long Li | b6903bc | 2018-05-30 12:48:00 -0700 | [diff] [blame] | 2223 | info, rqst->rq_pages[i], |
| 2224 | j*max_iov_size + offset, |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2225 | size, remaining_data_length); |
| 2226 | if (rc) |
| 2227 | goto done; |
| 2228 | } |
| 2229 | } |
| 2230 | |
| 2231 | done: |
| 2232 | /* |
| 2233 | * As an optimization, we don't wait for individual I/O to finish |
| 2234 | * before sending the next one. |
| 2235 | * Send them all and wait for pending send count to get to 0 |
| 2236 | * that means all the I/Os have been out and we are good to return |
| 2237 | */ |
| 2238 | |
| 2239 | wait_event(info->wait_send_payload_pending, |
| 2240 | atomic_read(&info->send_payload_pending) == 0); |
| 2241 | |
Long Li | d649e1b | 2017-11-22 17:38:42 -0700 | [diff] [blame] | 2242 | return rc; |
| 2243 | } |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2244 | |
| 2245 | static void register_mr_done(struct ib_cq *cq, struct ib_wc *wc) |
| 2246 | { |
| 2247 | struct smbd_mr *mr; |
| 2248 | struct ib_cqe *cqe; |
| 2249 | |
| 2250 | if (wc->status) { |
| 2251 | log_rdma_mr(ERR, "status=%d\n", wc->status); |
| 2252 | cqe = wc->wr_cqe; |
| 2253 | mr = container_of(cqe, struct smbd_mr, cqe); |
| 2254 | smbd_disconnect_rdma_connection(mr->conn); |
| 2255 | } |
| 2256 | } |
| 2257 | |
| 2258 | /* |
| 2259 | * The work queue function that recovers MRs |
| 2260 | * We need to call ib_dereg_mr() and ib_alloc_mr() before this MR can be used |
| 2261 | * again. Both calls are slow, so finish them in a workqueue. This will not |
| 2262 | * block I/O path. |
| 2263 | * There is one workqueue that recovers MRs, there is no need to lock as the |
| 2264 | * I/O requests calling smbd_register_mr will never update the links in the |
| 2265 | * mr_list. |
| 2266 | */ |
| 2267 | static void smbd_mr_recovery_work(struct work_struct *work) |
| 2268 | { |
| 2269 | struct smbd_connection *info = |
| 2270 | container_of(work, struct smbd_connection, mr_recovery_work); |
| 2271 | struct smbd_mr *smbdirect_mr; |
| 2272 | int rc; |
| 2273 | |
| 2274 | list_for_each_entry(smbdirect_mr, &info->mr_list, list) { |
Long Li | ff526d8 | 2018-09-20 21:18:39 +0000 | [diff] [blame] | 2275 | if (smbdirect_mr->state == MR_INVALIDATED) |
| 2276 | ib_dma_unmap_sg( |
| 2277 | info->id->device, smbdirect_mr->sgl, |
| 2278 | smbdirect_mr->sgl_count, |
| 2279 | smbdirect_mr->dir); |
| 2280 | else if (smbdirect_mr->state == MR_ERROR) { |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2281 | |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2282 | /* recover this MR entry */ |
| 2283 | rc = ib_dereg_mr(smbdirect_mr->mr); |
| 2284 | if (rc) { |
| 2285 | log_rdma_mr(ERR, |
| 2286 | "ib_dereg_mr failed rc=%x\n", |
| 2287 | rc); |
| 2288 | smbd_disconnect_rdma_connection(info); |
| 2289 | continue; |
| 2290 | } |
| 2291 | |
| 2292 | smbdirect_mr->mr = ib_alloc_mr( |
| 2293 | info->pd, info->mr_type, |
| 2294 | info->max_frmr_depth); |
| 2295 | if (IS_ERR(smbdirect_mr->mr)) { |
| 2296 | log_rdma_mr(ERR, |
| 2297 | "ib_alloc_mr failed mr_type=%x " |
| 2298 | "max_frmr_depth=%x\n", |
| 2299 | info->mr_type, |
| 2300 | info->max_frmr_depth); |
| 2301 | smbd_disconnect_rdma_connection(info); |
| 2302 | continue; |
| 2303 | } |
Long Li | ff526d8 | 2018-09-20 21:18:39 +0000 | [diff] [blame] | 2304 | } else |
| 2305 | /* This MR is being used, don't recover it */ |
| 2306 | continue; |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2307 | |
Long Li | ff526d8 | 2018-09-20 21:18:39 +0000 | [diff] [blame] | 2308 | smbdirect_mr->state = MR_READY; |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2309 | |
Long Li | ff526d8 | 2018-09-20 21:18:39 +0000 | [diff] [blame] | 2310 | /* smbdirect_mr->state is updated by this function |
| 2311 | * and is read and updated by I/O issuing CPUs trying |
| 2312 | * to get a MR, the call to atomic_inc_return |
| 2313 | * implicates a memory barrier and guarantees this |
| 2314 | * value is updated before waking up any calls to |
| 2315 | * get_mr() from the I/O issuing CPUs |
| 2316 | */ |
| 2317 | if (atomic_inc_return(&info->mr_ready_count) == 1) |
| 2318 | wake_up_interruptible(&info->wait_mr); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2319 | } |
| 2320 | } |
| 2321 | |
| 2322 | static void destroy_mr_list(struct smbd_connection *info) |
| 2323 | { |
| 2324 | struct smbd_mr *mr, *tmp; |
| 2325 | |
| 2326 | cancel_work_sync(&info->mr_recovery_work); |
| 2327 | list_for_each_entry_safe(mr, tmp, &info->mr_list, list) { |
| 2328 | if (mr->state == MR_INVALIDATED) |
| 2329 | ib_dma_unmap_sg(info->id->device, mr->sgl, |
| 2330 | mr->sgl_count, mr->dir); |
| 2331 | ib_dereg_mr(mr->mr); |
| 2332 | kfree(mr->sgl); |
| 2333 | kfree(mr); |
| 2334 | } |
| 2335 | } |
| 2336 | |
| 2337 | /* |
| 2338 | * Allocate MRs used for RDMA read/write |
| 2339 | * The number of MRs will not exceed hardware capability in responder_resources |
| 2340 | * All MRs are kept in mr_list. The MR can be recovered after it's used |
| 2341 | * Recovery is done in smbd_mr_recovery_work. The content of list entry changes |
| 2342 | * as MRs are used and recovered for I/O, but the list links will not change |
| 2343 | */ |
| 2344 | static int allocate_mr_list(struct smbd_connection *info) |
| 2345 | { |
| 2346 | int i; |
| 2347 | struct smbd_mr *smbdirect_mr, *tmp; |
| 2348 | |
| 2349 | INIT_LIST_HEAD(&info->mr_list); |
| 2350 | init_waitqueue_head(&info->wait_mr); |
| 2351 | spin_lock_init(&info->mr_list_lock); |
| 2352 | atomic_set(&info->mr_ready_count, 0); |
| 2353 | atomic_set(&info->mr_used_count, 0); |
| 2354 | init_waitqueue_head(&info->wait_for_mr_cleanup); |
| 2355 | /* Allocate more MRs (2x) than hardware responder_resources */ |
| 2356 | for (i = 0; i < info->responder_resources * 2; i++) { |
| 2357 | smbdirect_mr = kzalloc(sizeof(*smbdirect_mr), GFP_KERNEL); |
| 2358 | if (!smbdirect_mr) |
| 2359 | goto out; |
| 2360 | smbdirect_mr->mr = ib_alloc_mr(info->pd, info->mr_type, |
| 2361 | info->max_frmr_depth); |
| 2362 | if (IS_ERR(smbdirect_mr->mr)) { |
| 2363 | log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x " |
| 2364 | "max_frmr_depth=%x\n", |
| 2365 | info->mr_type, info->max_frmr_depth); |
| 2366 | goto out; |
| 2367 | } |
| 2368 | smbdirect_mr->sgl = kcalloc( |
| 2369 | info->max_frmr_depth, |
| 2370 | sizeof(struct scatterlist), |
| 2371 | GFP_KERNEL); |
| 2372 | if (!smbdirect_mr->sgl) { |
| 2373 | log_rdma_mr(ERR, "failed to allocate sgl\n"); |
| 2374 | ib_dereg_mr(smbdirect_mr->mr); |
| 2375 | goto out; |
| 2376 | } |
| 2377 | smbdirect_mr->state = MR_READY; |
| 2378 | smbdirect_mr->conn = info; |
| 2379 | |
| 2380 | list_add_tail(&smbdirect_mr->list, &info->mr_list); |
| 2381 | atomic_inc(&info->mr_ready_count); |
| 2382 | } |
| 2383 | INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work); |
| 2384 | return 0; |
| 2385 | |
| 2386 | out: |
| 2387 | kfree(smbdirect_mr); |
| 2388 | |
| 2389 | list_for_each_entry_safe(smbdirect_mr, tmp, &info->mr_list, list) { |
| 2390 | ib_dereg_mr(smbdirect_mr->mr); |
| 2391 | kfree(smbdirect_mr->sgl); |
| 2392 | kfree(smbdirect_mr); |
| 2393 | } |
| 2394 | return -ENOMEM; |
| 2395 | } |
| 2396 | |
| 2397 | /* |
| 2398 | * Get a MR from mr_list. This function waits until there is at least one |
| 2399 | * MR available in the list. It may access the list while the |
| 2400 | * smbd_mr_recovery_work is recovering the MR list. This doesn't need a lock |
| 2401 | * as they never modify the same places. However, there may be several CPUs |
| 2402 | * issueing I/O trying to get MR at the same time, mr_list_lock is used to |
| 2403 | * protect this situation. |
| 2404 | */ |
| 2405 | static struct smbd_mr *get_mr(struct smbd_connection *info) |
| 2406 | { |
| 2407 | struct smbd_mr *ret; |
| 2408 | int rc; |
| 2409 | again: |
| 2410 | rc = wait_event_interruptible(info->wait_mr, |
| 2411 | atomic_read(&info->mr_ready_count) || |
| 2412 | info->transport_status != SMBD_CONNECTED); |
| 2413 | if (rc) { |
| 2414 | log_rdma_mr(ERR, "wait_event_interruptible rc=%x\n", rc); |
| 2415 | return NULL; |
| 2416 | } |
| 2417 | |
| 2418 | if (info->transport_status != SMBD_CONNECTED) { |
| 2419 | log_rdma_mr(ERR, "info->transport_status=%x\n", |
| 2420 | info->transport_status); |
| 2421 | return NULL; |
| 2422 | } |
| 2423 | |
| 2424 | spin_lock(&info->mr_list_lock); |
| 2425 | list_for_each_entry(ret, &info->mr_list, list) { |
| 2426 | if (ret->state == MR_READY) { |
| 2427 | ret->state = MR_REGISTERED; |
| 2428 | spin_unlock(&info->mr_list_lock); |
| 2429 | atomic_dec(&info->mr_ready_count); |
| 2430 | atomic_inc(&info->mr_used_count); |
| 2431 | return ret; |
| 2432 | } |
| 2433 | } |
| 2434 | |
| 2435 | spin_unlock(&info->mr_list_lock); |
| 2436 | /* |
| 2437 | * It is possible that we could fail to get MR because other processes may |
| 2438 | * try to acquire a MR at the same time. If this is the case, retry it. |
| 2439 | */ |
| 2440 | goto again; |
| 2441 | } |
| 2442 | |
| 2443 | /* |
| 2444 | * Register memory for RDMA read/write |
| 2445 | * pages[]: the list of pages to register memory with |
| 2446 | * num_pages: the number of pages to register |
| 2447 | * tailsz: if non-zero, the bytes to register in the last page |
| 2448 | * writing: true if this is a RDMA write (SMB read), false for RDMA read |
| 2449 | * need_invalidate: true if this MR needs to be locally invalidated after I/O |
| 2450 | * return value: the MR registered, NULL if failed. |
| 2451 | */ |
| 2452 | struct smbd_mr *smbd_register_mr( |
| 2453 | struct smbd_connection *info, struct page *pages[], int num_pages, |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2454 | int offset, int tailsz, bool writing, bool need_invalidate) |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2455 | { |
| 2456 | struct smbd_mr *smbdirect_mr; |
| 2457 | int rc, i; |
| 2458 | enum dma_data_direction dir; |
| 2459 | struct ib_reg_wr *reg_wr; |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2460 | |
| 2461 | if (num_pages > info->max_frmr_depth) { |
| 2462 | log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n", |
| 2463 | num_pages, info->max_frmr_depth); |
| 2464 | return NULL; |
| 2465 | } |
| 2466 | |
| 2467 | smbdirect_mr = get_mr(info); |
| 2468 | if (!smbdirect_mr) { |
| 2469 | log_rdma_mr(ERR, "get_mr returning NULL\n"); |
| 2470 | return NULL; |
| 2471 | } |
| 2472 | smbdirect_mr->need_invalidate = need_invalidate; |
| 2473 | smbdirect_mr->sgl_count = num_pages; |
| 2474 | sg_init_table(smbdirect_mr->sgl, num_pages); |
| 2475 | |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2476 | log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n", |
| 2477 | num_pages, offset, tailsz); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2478 | |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2479 | if (num_pages == 1) { |
| 2480 | sg_set_page(&smbdirect_mr->sgl[0], pages[0], tailsz, offset); |
| 2481 | goto skip_multiple_pages; |
| 2482 | } |
| 2483 | |
| 2484 | /* We have at least two pages to register */ |
| 2485 | sg_set_page( |
| 2486 | &smbdirect_mr->sgl[0], pages[0], PAGE_SIZE - offset, offset); |
| 2487 | i = 1; |
| 2488 | while (i < num_pages - 1) { |
| 2489 | sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0); |
| 2490 | i++; |
| 2491 | } |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2492 | sg_set_page(&smbdirect_mr->sgl[i], pages[i], |
| 2493 | tailsz ? tailsz : PAGE_SIZE, 0); |
| 2494 | |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2495 | skip_multiple_pages: |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2496 | dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; |
| 2497 | smbdirect_mr->dir = dir; |
| 2498 | rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir); |
| 2499 | if (!rc) { |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2500 | log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n", |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2501 | num_pages, dir, rc); |
| 2502 | goto dma_map_error; |
| 2503 | } |
| 2504 | |
| 2505 | rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages, |
| 2506 | NULL, PAGE_SIZE); |
| 2507 | if (rc != num_pages) { |
Long Li | 7cf20bc | 2018-05-30 12:48:02 -0700 | [diff] [blame] | 2508 | log_rdma_mr(ERR, |
| 2509 | "ib_map_mr_sg failed rc = %d num_pages = %x\n", |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2510 | rc, num_pages); |
| 2511 | goto map_mr_error; |
| 2512 | } |
| 2513 | |
| 2514 | ib_update_fast_reg_key(smbdirect_mr->mr, |
| 2515 | ib_inc_rkey(smbdirect_mr->mr->rkey)); |
| 2516 | reg_wr = &smbdirect_mr->wr; |
| 2517 | reg_wr->wr.opcode = IB_WR_REG_MR; |
| 2518 | smbdirect_mr->cqe.done = register_mr_done; |
| 2519 | reg_wr->wr.wr_cqe = &smbdirect_mr->cqe; |
| 2520 | reg_wr->wr.num_sge = 0; |
| 2521 | reg_wr->wr.send_flags = IB_SEND_SIGNALED; |
| 2522 | reg_wr->mr = smbdirect_mr->mr; |
| 2523 | reg_wr->key = smbdirect_mr->mr->rkey; |
| 2524 | reg_wr->access = writing ? |
| 2525 | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : |
| 2526 | IB_ACCESS_REMOTE_READ; |
| 2527 | |
| 2528 | /* |
| 2529 | * There is no need for waiting for complemtion on ib_post_send |
| 2530 | * on IB_WR_REG_MR. Hardware enforces a barrier and order of execution |
| 2531 | * on the next ib_post_send when we actaully send I/O to remote peer |
| 2532 | */ |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 2533 | rc = ib_post_send(info->id->qp, ®_wr->wr, NULL); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2534 | if (!rc) |
| 2535 | return smbdirect_mr; |
| 2536 | |
| 2537 | log_rdma_mr(ERR, "ib_post_send failed rc=%x reg_wr->key=%x\n", |
| 2538 | rc, reg_wr->key); |
| 2539 | |
| 2540 | /* If all failed, attempt to recover this MR by setting it MR_ERROR*/ |
| 2541 | map_mr_error: |
| 2542 | ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl, |
| 2543 | smbdirect_mr->sgl_count, smbdirect_mr->dir); |
| 2544 | |
| 2545 | dma_map_error: |
| 2546 | smbdirect_mr->state = MR_ERROR; |
| 2547 | if (atomic_dec_and_test(&info->mr_used_count)) |
| 2548 | wake_up(&info->wait_for_mr_cleanup); |
| 2549 | |
Long Li | 21a4e14 | 2018-03-30 15:16:36 -0700 | [diff] [blame] | 2550 | smbd_disconnect_rdma_connection(info); |
| 2551 | |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2552 | return NULL; |
| 2553 | } |
| 2554 | |
| 2555 | static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc) |
| 2556 | { |
| 2557 | struct smbd_mr *smbdirect_mr; |
| 2558 | struct ib_cqe *cqe; |
| 2559 | |
| 2560 | cqe = wc->wr_cqe; |
| 2561 | smbdirect_mr = container_of(cqe, struct smbd_mr, cqe); |
| 2562 | smbdirect_mr->state = MR_INVALIDATED; |
| 2563 | if (wc->status != IB_WC_SUCCESS) { |
| 2564 | log_rdma_mr(ERR, "invalidate failed status=%x\n", wc->status); |
| 2565 | smbdirect_mr->state = MR_ERROR; |
| 2566 | } |
| 2567 | complete(&smbdirect_mr->invalidate_done); |
| 2568 | } |
| 2569 | |
| 2570 | /* |
| 2571 | * Deregister a MR after I/O is done |
| 2572 | * This function may wait if remote invalidation is not used |
| 2573 | * and we have to locally invalidate the buffer to prevent data is being |
| 2574 | * modified by remote peer after upper layer consumes it |
| 2575 | */ |
| 2576 | int smbd_deregister_mr(struct smbd_mr *smbdirect_mr) |
| 2577 | { |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 2578 | struct ib_send_wr *wr; |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2579 | struct smbd_connection *info = smbdirect_mr->conn; |
| 2580 | int rc = 0; |
| 2581 | |
| 2582 | if (smbdirect_mr->need_invalidate) { |
| 2583 | /* Need to finish local invalidation before returning */ |
| 2584 | wr = &smbdirect_mr->inv_wr; |
| 2585 | wr->opcode = IB_WR_LOCAL_INV; |
| 2586 | smbdirect_mr->cqe.done = local_inv_done; |
| 2587 | wr->wr_cqe = &smbdirect_mr->cqe; |
| 2588 | wr->num_sge = 0; |
| 2589 | wr->ex.invalidate_rkey = smbdirect_mr->mr->rkey; |
| 2590 | wr->send_flags = IB_SEND_SIGNALED; |
| 2591 | |
| 2592 | init_completion(&smbdirect_mr->invalidate_done); |
Bart Van Assche | 7393059 | 2018-07-18 09:25:25 -0700 | [diff] [blame] | 2593 | rc = ib_post_send(info->id->qp, wr, NULL); |
Long Li | c739858 | 2017-11-22 17:38:44 -0700 | [diff] [blame] | 2594 | if (rc) { |
| 2595 | log_rdma_mr(ERR, "ib_post_send failed rc=%x\n", rc); |
| 2596 | smbd_disconnect_rdma_connection(info); |
| 2597 | goto done; |
| 2598 | } |
| 2599 | wait_for_completion(&smbdirect_mr->invalidate_done); |
| 2600 | smbdirect_mr->need_invalidate = false; |
| 2601 | } else |
| 2602 | /* |
| 2603 | * For remote invalidation, just set it to MR_INVALIDATED |
| 2604 | * and defer to mr_recovery_work to recover the MR for next use |
| 2605 | */ |
| 2606 | smbdirect_mr->state = MR_INVALIDATED; |
| 2607 | |
| 2608 | /* |
| 2609 | * Schedule the work to do MR recovery for future I/Os |
| 2610 | * MR recovery is slow and we don't want it to block the current I/O |
| 2611 | */ |
| 2612 | queue_work(info->workqueue, &info->mr_recovery_work); |
| 2613 | |
| 2614 | done: |
| 2615 | if (atomic_dec_and_test(&info->mr_used_count)) |
| 2616 | wake_up(&info->wait_for_mr_cleanup); |
| 2617 | |
| 2618 | return rc; |
| 2619 | } |