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Long Li03bee012017-11-07 01:54:56 -07001/*
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 Lif1981862017-11-04 18:17:24 -070016#include <linux/module.h>
Long Lif64b78f2017-11-22 17:38:40 -070017#include <linux/highmem.h>
Long Li03bee012017-11-07 01:54:56 -070018#include "smbdirect.h"
Long Lif1981862017-11-04 18:17:24 -070019#include "cifs_debug.h"
Long Lib6903bc2018-05-30 12:48:00 -070020#include "cifsproto.h"
Paulo Alcantara35e2cc12018-06-15 10:22:44 -030021#include "smb2proto.h"
Long Lif1981862017-11-04 18:17:24 -070022
23static struct smbd_response *get_empty_queue_buffer(
24 struct smbd_connection *info);
25static struct smbd_response *get_receive_buffer(
26 struct smbd_connection *info);
27static void put_receive_buffer(
28 struct smbd_connection *info,
29 struct smbd_response *response);
30static int allocate_receive_buffers(struct smbd_connection *info, int num_buf);
31static void destroy_receive_buffers(struct smbd_connection *info);
32
33static void put_empty_packet(
34 struct smbd_connection *info, struct smbd_response *response);
35static void enqueue_reassembly(
36 struct smbd_connection *info,
37 struct smbd_response *response, int data_length);
38static struct smbd_response *_get_first_reassembly(
39 struct smbd_connection *info);
40
41static int smbd_post_recv(
42 struct smbd_connection *info,
43 struct smbd_response *response);
44
45static int smbd_post_send_empty(struct smbd_connection *info);
Long Lid649e1b2017-11-22 17:38:42 -070046static int smbd_post_send_data(
47 struct smbd_connection *info,
48 struct kvec *iov, int n_vec, int remaining_data_length);
49static 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 Li03bee012017-11-07 01:54:56 -070052
Long Lic7398582017-11-22 17:38:44 -070053static void destroy_mr_list(struct smbd_connection *info);
54static int allocate_mr_list(struct smbd_connection *info);
55
Long Li03bee012017-11-07 01:54:56 -070056/* 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 */
90int smbd_receive_credit_max = 255;
91
92/* The remote peer's credit request of local peer */
93int smbd_send_credit_target = 255;
94
95/* The maximum single message size can be sent to remote peer */
96int smbd_max_send_size = 1364;
97
98/* The maximum fragmented upper-layer payload receive size supported */
99int smbd_max_fragmented_recv_size = 1024 * 1024;
100
101/* The maximum single-message size which can be received */
102int smbd_max_receive_size = 8192;
103
104/* The timeout to initiate send of a keepalive message on idle */
105int 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 */
112int smbd_max_frmr_depth = 2048;
113
114/* If payload is less than this byte, use RDMA send/recv not read/write */
115int rdma_readwrite_threshold = 4096;
Long Lif1981862017-11-04 18:17:24 -0700116
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
132static unsigned int smbd_logging_class;
133module_param(smbd_logging_class, uint, 0644);
134MODULE_PARM_DESC(smbd_logging_class,
135 "Logging class for SMBD transport 0x0 to 0x100");
136
137#define ERR 0x0
138#define INFO 0x1
139static unsigned int smbd_logging_level = ERR;
140module_param(smbd_logging_level, uint, 0644);
141MODULE_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...) \
145do { \
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 Lif1981862017-11-04 18:17:24 -0700167static 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
178static 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 */
184static 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 Lie8b3bfe2019-04-05 21:36:31 +0000233 wake_up_interruptible(&info->disconn_wait);
Long Li050b8c32019-04-04 11:35:42 -0500234 wake_up_interruptible(&info->wait_reassembly_queue);
235 wake_up_interruptible_all(&info->wait_send_queue);
Long Lif1981862017-11-04 18:17:24 -0700236 break;
237
238 default:
239 break;
240 }
241
242 return 0;
243}
244
245/* Upcall from RDMA QP */
246static void
247smbd_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
264static inline void *smbd_request_payload(struct smbd_request *request)
265{
266 return (void *)request->packet;
267}
268
269static 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 */
275static 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
307static 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 */
325static 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 Lic7398582017-11-22 17:38:44 -0700381 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 Lif1981862017-11-04 18:17:24 -0700391
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 */
399static 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
416static 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
471static 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 */
491static 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
583error:
584 put_receive_buffer(info, response);
585}
586
587static 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
643out:
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 */
653static 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
662static 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 Lic7398582017-11-22 17:38:44 -0700686 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 Lif1981862017-11-04 18:17:24 -0700692
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
702out2:
703 rdma_destroy_id(info->id);
704 info->id = NULL;
705
706out1:
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 */
716static int smbd_post_send_negotiate_req(struct smbd_connection *info)
717{
Bart Van Assche73930592018-07-18 09:25:25 -0700718 struct ib_send_wr send_wr;
Long Lif1981862017-11-04 18:17:24 -0700719 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 Assche73930592018-07-18 09:25:25 -0700770 rc = ib_post_send(info->id->qp, &send_wr, NULL);
Long Lif1981862017-11-04 18:17:24 -0700771 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 Li21a4e142018-03-30 15:16:36 -0700780 smbd_disconnect_rdma_connection(info);
781
Long Lif1981862017-11-04 18:17:24 -0700782dma_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 */
795static 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 */
816static 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 */
838static 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
919err:
920 atomic_inc(&info->send_credits);
921 return rc;
922}
923
924static 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 */
937static int smbd_post_send(struct smbd_connection *info,
938 struct smbd_request *request, bool has_payload)
939{
Bart Van Assche73930592018-07-18 09:25:25 -0700940 struct ib_send_wr send_wr;
Long Lif1981862017-11-04 18:17:24 -0700941 int rc, i;
942
943 for (i = 0; i < request->num_sge; i++) {
944 log_rdma_send(INFO,
Colin Ian Kingac65cb62018-02-09 12:14:15 +0000945 "rdma_request sge[%d] addr=%llu length=%u\n",
Long Liff30b892018-04-17 12:17:10 -0700946 i, request->sge[i].addr, request->sge[i].length);
Long Lif1981862017-11-04 18:17:24 -0700947 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 Assche73930592018-07-18 09:25:25 -0700971 rc = ib_post_send(info->id->qp, &send_wr, NULL);
Long Lif1981862017-11-04 18:17:24 -0700972 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 Li21a4e142018-03-30 15:16:36 -0700981 smbd_disconnect_rdma_connection(info);
Long Lif1981862017-11-04 18:17:24 -0700982 } 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
990static 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
1023dma_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 Lid649e1b2017-11-22 17:38:42 -07001035 * 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 */
1041static 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 Lif1981862017-11-04 18:17:24 -07001053 * 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 */
1057static 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 Lid649e1b2017-11-22 17:38:42 -07001064 * 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 */
1070static 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 Lif1981862017-11-04 18:17:24 -07001093 * 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 */
1097static int smbd_post_recv(
1098 struct smbd_connection *info, struct smbd_response *response)
1099{
Bart Van Assche73930592018-07-18 09:25:25 -07001100 struct ib_recv_wr recv_wr;
Long Lif1981862017-11-04 18:17:24 -07001101 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 Assche73930592018-07-18 09:25:25 -07001119 rc = ib_post_recv(info->id->qp, &recv_wr, NULL);
Long Lif1981862017-11-04 18:17:24 -07001120 if (rc) {
1121 ib_dma_unmap_single(info->id->device, response->sge.addr,
1122 response->sge.length, DMA_FROM_DEVICE);
Long Li21a4e142018-03-30 15:16:36 -07001123 smbd_disconnect_rdma_connection(info);
Long Lif1981862017-11-04 18:17:24 -07001124 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 */
1131static 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
1169static 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 */
1190static 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 */
1216static 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
1228static 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 */
1253static 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 */
1278static 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 */
1296static 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
1328allocate_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
1341static 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 */
1358static 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 */
1372static 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 Li050b8c32019-04-04 11:35:42 -05001394/*
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 */
1399void smbd_destroy(struct TCP_Server_Info *server)
Long Li8ef130f2017-11-22 17:38:37 -07001400{
Long Li050b8c32019-04-04 11:35:42 -05001401 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 Li8ef130f2017-11-22 17:38:37 -07001410 log_rdma_event(INFO, "destroying rdma session\n");
Long Li050b8c32019-04-04 11:35:42 -05001411 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 Lie8b3bfe2019-04-05 21:36:31 +00001414 wait_event_interruptible(
Long Li050b8c32019-04-04 11:35:42 -05001415 info->disconn_wait,
1416 info->transport_status == SMBD_DISCONNECTED);
1417 }
Long Li8ef130f2017-11-22 17:38:37 -07001418
Long Li050b8c32019-04-04 11:35:42 -05001419 log_rdma_event(INFO, "destroying qp\n");
1420 ib_drain_qp(info->id->qp);
1421 rdma_destroy_qp(info->id);
Long Li8ef130f2017-11-22 17:38:37 -07001422
Long Li050b8c32019-04-04 11:35:42 -05001423 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 Li8ef130f2017-11-22 17:38:37 -07001485
1486 destroy_workqueue(info->workqueue);
1487 kfree(info);
1488}
1489
Long Liad57b8e2017-11-22 17:38:35 -07001490/*
1491 * Reconnect this SMBD connection, called from upper layer
1492 * return value: 0 on success, or actual error code
1493 */
1494int smbd_reconnect(struct TCP_Server_Info *server)
1495{
1496 log_rdma_event(INFO, "reconnecting rdma session\n");
1497
1498 if (!server->smbd_conn) {
Long Li48f238a2018-03-30 15:16:35 -07001499 log_rdma_event(INFO, "rdma session already destroyed\n");
1500 goto create_conn;
Long Liad57b8e2017-11-22 17:38:35 -07001501 }
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 Li050b8c32019-04-04 11:35:42 -05001509 smbd_destroy(server);
Long Liad57b8e2017-11-22 17:38:35 -07001510 }
1511
Long Li48f238a2018-03-30 15:16:35 -07001512create_conn:
Long Liad57b8e2017-11-22 17:38:35 -07001513 log_rdma_event(INFO, "creating rdma session\n");
1514 server->smbd_conn = smbd_get_connection(
1515 server, (struct sockaddr *) &server->dstaddr);
Long Li48f238a2018-03-30 15:16:35 -07001516 log_rdma_event(INFO, "created rdma session info=%p\n",
1517 server->smbd_conn);
Long Liad57b8e2017-11-22 17:38:35 -07001518
1519 return server->smbd_conn ? 0 : -ENOENT;
1520}
1521
Long Lif1981862017-11-04 18:17:24 -07001522static 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
1533static int allocate_caches_and_workqueue(struct smbd_connection *info)
1534{
1535 char name[MAX_NAME_LEN];
1536 int rc;
1537
Ronnie Sahlberg74ea5f92019-02-09 09:51:11 +10001538 scnprintf(name, MAX_NAME_LEN, "smbd_request_%p", info);
Long Lif1981862017-11-04 18:17:24 -07001539 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 Sahlberg74ea5f92019-02-09 09:51:11 +10001554 scnprintf(name, MAX_NAME_LEN, "smbd_response_%p", info);
Long Lif1981862017-11-04 18:17:24 -07001555 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 Sahlberg74ea5f92019-02-09 09:51:11 +10001570 scnprintf(name, MAX_NAME_LEN, "smbd_%p", info);
Long Lif1981862017-11-04 18:17:24 -07001571 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
1583out5:
1584 destroy_workqueue(info->workqueue);
1585out4:
1586 mempool_destroy(info->response_mempool);
1587out3:
1588 kmem_cache_destroy(info->response_cache);
1589out2:
1590 mempool_destroy(info->request_mempool);
1591out1:
1592 kmem_cache_destroy(info->request_cache);
1593 return -ENOMEM;
1594}
1595
1596/* Create a SMBD connection, called by upper layer */
kbuild test robot90844322017-12-18 21:30:06 +08001597static struct smbd_connection *_smbd_get_connection(
Long Lif1981862017-11-04 18:17:24 -07001598 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 Lic7398582017-11-22 17:38:44 -07001605 struct ib_port_immutable port_immutable;
1606 u32 ird_ord_hdr[2];
Long Lif1981862017-11-04 18:17:24 -07001607
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 Wise33023fb2018-06-18 08:05:26 -07001650 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 Lif1981862017-11-04 18:17:24 -07001660 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 Lic7398582017-11-22 17:38:44 -07001702 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 Heib3023a1e2018-12-10 21:09:48 +02001712 info->id->device->ops.get_port_immutable(
Long Lic7398582017-11-22 17:38:44 -07001713 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 Lif1981862017-11-04 18:17:24 -07001724 conn_param.retry_count = SMBD_CM_RETRY;
1725 conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY;
1726 conn_param.flow_control = 0;
Long Lif1981862017-11-04 18:17:24 -07001727
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 Li050b8c32019-04-04 11:35:42 -05001732 init_waitqueue_head(&info->disconn_wait);
1733 init_waitqueue_head(&info->wait_reassembly_queue);
Long Lif1981862017-11-04 18:17:24 -07001734 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 Lif1981862017-11-04 18:17:24 -07001757 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 Lif1981862017-11-04 18:17:24 -07001769 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 Lic7398582017-11-22 17:38:44 -07001780 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 Lif1981862017-11-04 18:17:24 -07001786 return info;
1787
Long Lic7398582017-11-22 17:38:44 -07001788allocate_mr_failed:
1789 /* At this point, need to a full transport shutdown */
Long Li050b8c32019-04-04 11:35:42 -05001790 smbd_destroy(server);
Long Lic7398582017-11-22 17:38:44 -07001791 return NULL;
1792
Long Lif1981862017-11-04 18:17:24 -07001793negotiation_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
1802allocate_cache_failed:
1803rdma_connect_failed:
1804 rdma_destroy_qp(info->id);
1805
1806create_qp_failed:
1807alloc_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
1813config_failed:
1814 ib_dealloc_pd(info->pd);
1815 rdma_destroy_id(info->id);
1816
1817create_id_failed:
1818 kfree(info);
1819 return NULL;
1820}
Long Li399f9532017-11-17 17:26:52 -08001821
1822struct 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
1828try_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 Lif64b78f2017-11-22 17:38:40 -07001838
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 French2026b062018-01-24 23:07:41 -06001852static int smbd_recv_buf(struct smbd_connection *info, char *buf,
1853 unsigned int size)
Long Lif64b78f2017-11-22 17:38:40 -07001854{
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 Lif64b78f2017-11-22 17:38:40 -07001860
1861again:
Long Lif64b78f2017-11-22 17:38:40 -07001862 /*
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 Frenchf9de1512018-02-03 19:45:07 -06001926 if (queue_length)
1927 list_del(&response->list);
1928 else {
Arnd Bergmanne36c0482018-01-10 21:51:05 +01001929 spin_lock_irq(
1930 &info->reassembly_queue_lock);
Steve Frenchf9de1512018-02-03 19:45:07 -06001931 list_del(&response->list);
Arnd Bergmanne36c0482018-01-10 21:51:05 +01001932 spin_unlock_irq(
1933 &info->reassembly_queue_lock);
Steve Frenchf9de1512018-02-03 19:45:07 -06001934 }
1935 queue_removed++;
Long Lif64b78f2017-11-22 17:38:40 -07001936 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 Bergmanne36c0482018-01-10 21:51:05 +01001954 spin_lock_irq(&info->reassembly_queue_lock);
Long Lif64b78f2017-11-22 17:38:40 -07001955 info->reassembly_data_length -= data_read;
1956 info->reassembly_queue_length -= queue_removed;
Arnd Bergmanne36c0482018-01-10 21:51:05 +01001957 spin_unlock_irq(&info->reassembly_queue_lock);
Long Lif64b78f2017-11-22 17:38:40 -07001958
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);
1964read_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 Li98e0d402019-04-05 21:36:32 +00001975 return rc;
Long Lif64b78f2017-11-22 17:38:40 -07001976
Long Lie8b3bfe2019-04-05 21:36:31 +00001977 if (info->transport_status != SMBD_CONNECTED) {
1978 log_read(ERR, "disconnected\n");
1979 return 0;
1980 }
1981
Long Lif64b78f2017-11-22 17:38:40 -07001982 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 French2026b062018-01-24 23:07:41 -06001991static int smbd_recv_page(struct smbd_connection *info,
Long Li6509f502018-05-30 12:48:01 -07001992 struct page *page, unsigned int page_offset,
1993 unsigned int to_read)
Long Lif64b78f2017-11-22 17:38:40 -07001994{
1995 int ret;
1996 char *to_address;
Long Li6509f502018-05-30 12:48:01 -07001997 void *page_address;
Long Lif64b78f2017-11-22 17:38:40 -07001998
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 Li6509f502018-05-30 12:48:01 -07002005 return ret;
Long Lif64b78f2017-11-22 17:38:40 -07002006
2007 /* now we can read from reassembly queue and not sleep */
Long Li6509f502018-05-30 12:48:01 -07002008 page_address = kmap_atomic(page);
2009 to_address = (char *) page_address + page_offset;
Long Lif64b78f2017-11-22 17:38:40 -07002010
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 Li6509f502018-05-30 12:48:01 -07002015 kunmap_atomic(page_address);
Long Lif64b78f2017-11-22 17:38:40 -07002016
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 */
2025int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
2026{
2027 char *buf;
2028 struct page *page;
Long Li6509f502018-05-30 12:48:01 -07002029 unsigned int to_read, page_offset;
Long Lif64b78f2017-11-22 17:38:40 -07002030 int rc;
2031
David Howells00e23702018-10-22 13:07:28 +01002032 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 Lif64b78f2017-11-22 17:38:40 -07002042 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 Howells00e23702018-10-22 13:07:28 +01002047 case ITER_BVEC:
Long Lif64b78f2017-11-22 17:38:40 -07002048 page = msg->msg_iter.bvec->bv_page;
Long Li6509f502018-05-30 12:48:01 -07002049 page_offset = msg->msg_iter.bvec->bv_offset;
Long Lif64b78f2017-11-22 17:38:40 -07002050 to_read = msg->msg_iter.bvec->bv_len;
Long Li6509f502018-05-30 12:48:01 -07002051 rc = smbd_recv_page(info, page, page_offset, to_read);
Long Lif64b78f2017-11-22 17:38:40 -07002052 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 Howells00e23702018-10-22 13:07:28 +01002057 iov_iter_type(&msg->msg_iter));
Long Li6509f502018-05-30 12:48:01 -07002058 rc = -EINVAL;
Long Lif64b78f2017-11-22 17:38:40 -07002059 }
2060
David Howells00e23702018-10-22 13:07:28 +01002061out:
Long Lif64b78f2017-11-22 17:38:40 -07002062 /* SMBDirect will read it all or nothing */
2063 if (rc > 0)
2064 msg->msg_iter.count = 0;
2065 return rc;
2066}
Long Lid649e1b2017-11-22 17:38:42 -07002067
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 Sahlberg81f39f92018-06-28 10:47:14 +10002074int smbd_send(struct TCP_Server_Info *server, struct smb_rqst *rqst)
Long Lid649e1b2017-11-22 17:38:42 -07002075{
Ronnie Sahlberg81f39f92018-06-28 10:47:14 +10002076 struct smbd_connection *info = server->smbd_conn;
Long Lid649e1b2017-11-22 17:38:42 -07002077 struct kvec vec;
2078 int nvecs;
2079 int size;
Paulo Alcantara35e2cc12018-06-15 10:22:44 -03002080 unsigned int buflen, remaining_data_length;
Long Lid649e1b2017-11-22 17:38:42 -07002081 int start, i, j;
2082 int max_iov_size =
2083 info->max_send_size - sizeof(struct smbd_data_transfer);
Long Li8bcda1d2018-04-17 12:17:07 -07002084 struct kvec *iov;
Long Lid649e1b2017-11-22 17:38:42 -07002085 int rc;
2086
Long Lid649e1b2017-11-22 17:38:42 -07002087 if (info->transport_status != SMBD_CONNECTED) {
2088 rc = -ENODEV;
2089 goto done;
2090 }
2091
2092 /*
Long Li8bcda1d2018-04-17 12:17:07 -07002093 * Skip the RFC1002 length defined in MS-SMB2 section 2.1
2094 * It is used only for TCP transport in the iov[0]
Long Lid649e1b2017-11-22 17:38:42 -07002095 * 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 Li8bcda1d2018-04-17 12:17:07 -07002098
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 Lid649e1b2017-11-22 17:38:42 -07002103
Long Lib6903bc2018-05-30 12:48:00 -07002104 /*
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 Sahlberg81f39f92018-06-28 10:47:14 +10002109 buflen = smb_rqst_len(server, rqst);
Long Lid649e1b2017-11-22 17:38:42 -07002110
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 Alcantara35e2cc12018-06-15 10:22:44 -03002119 iov = &rqst->rq_iov[1];
2120
Long Liff30b892018-04-17 12:17:10 -07002121 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 Lid649e1b2017-11-22 17:38:42 -07002125 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 Li8bcda1d2018-04-17 12:17:07 -07002180 if (i == rqst->rq_nvec-1)
Long Liab60ee72018-04-17 12:17:05 -07002181 break;
Long Lid649e1b2017-11-22 17:38:42 -07002182 }
2183 start = i;
2184 buflen = 0;
2185 } else {
2186 i++;
Long Li8bcda1d2018-04-17 12:17:07 -07002187 if (i == rqst->rq_nvec-1) {
Long Lid649e1b2017-11-22 17:38:42 -07002188 /* 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 Lib6903bc2018-05-30 12:48:00 -07002207 unsigned int offset;
2208
2209 rqst_page_get_length(rqst, i, &buflen, &offset);
Long Lid649e1b2017-11-22 17:38:42 -07002210 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 Lib6903bc2018-05-30 12:48:00 -07002220 i, j*max_iov_size+offset, size,
2221 remaining_data_length);
Long Lid649e1b2017-11-22 17:38:42 -07002222 rc = smbd_post_send_page(
Long Lib6903bc2018-05-30 12:48:00 -07002223 info, rqst->rq_pages[i],
2224 j*max_iov_size + offset,
Long Lid649e1b2017-11-22 17:38:42 -07002225 size, remaining_data_length);
2226 if (rc)
2227 goto done;
2228 }
2229 }
2230
2231done:
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 Lid649e1b2017-11-22 17:38:42 -07002242 return rc;
2243}
Long Lic7398582017-11-22 17:38:44 -07002244
2245static 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 */
2267static 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 Liff526d82018-09-20 21:18:39 +00002275 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 Lic7398582017-11-22 17:38:44 -07002281
Long Li7cf20bc2018-05-30 12:48:02 -07002282 /* 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 Liff526d82018-09-20 21:18:39 +00002304 } else
2305 /* This MR is being used, don't recover it */
2306 continue;
Long Li7cf20bc2018-05-30 12:48:02 -07002307
Long Liff526d82018-09-20 21:18:39 +00002308 smbdirect_mr->state = MR_READY;
Long Lic7398582017-11-22 17:38:44 -07002309
Long Liff526d82018-09-20 21:18:39 +00002310 /* 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 Lic7398582017-11-22 17:38:44 -07002319 }
2320}
2321
2322static 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 */
2344static 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
2386out:
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 */
2405static struct smbd_mr *get_mr(struct smbd_connection *info)
2406{
2407 struct smbd_mr *ret;
2408 int rc;
2409again:
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 */
2452struct smbd_mr *smbd_register_mr(
2453 struct smbd_connection *info, struct page *pages[], int num_pages,
Long Li7cf20bc2018-05-30 12:48:02 -07002454 int offset, int tailsz, bool writing, bool need_invalidate)
Long Lic7398582017-11-22 17:38:44 -07002455{
2456 struct smbd_mr *smbdirect_mr;
2457 int rc, i;
2458 enum dma_data_direction dir;
2459 struct ib_reg_wr *reg_wr;
Long Lic7398582017-11-22 17:38:44 -07002460
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 Li7cf20bc2018-05-30 12:48:02 -07002476 log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n",
2477 num_pages, offset, tailsz);
Long Lic7398582017-11-22 17:38:44 -07002478
Long Li7cf20bc2018-05-30 12:48:02 -07002479 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 Lic7398582017-11-22 17:38:44 -07002492 sg_set_page(&smbdirect_mr->sgl[i], pages[i],
2493 tailsz ? tailsz : PAGE_SIZE, 0);
2494
Long Li7cf20bc2018-05-30 12:48:02 -07002495skip_multiple_pages:
Long Lic7398582017-11-22 17:38:44 -07002496 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 Li7cf20bc2018-05-30 12:48:02 -07002500 log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n",
Long Lic7398582017-11-22 17:38:44 -07002501 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 Li7cf20bc2018-05-30 12:48:02 -07002508 log_rdma_mr(ERR,
2509 "ib_map_mr_sg failed rc = %d num_pages = %x\n",
Long Lic7398582017-11-22 17:38:44 -07002510 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 Assche73930592018-07-18 09:25:25 -07002533 rc = ib_post_send(info->id->qp, &reg_wr->wr, NULL);
Long Lic7398582017-11-22 17:38:44 -07002534 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*/
2541map_mr_error:
2542 ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl,
2543 smbdirect_mr->sgl_count, smbdirect_mr->dir);
2544
2545dma_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 Li21a4e142018-03-30 15:16:36 -07002550 smbd_disconnect_rdma_connection(info);
2551
Long Lic7398582017-11-22 17:38:44 -07002552 return NULL;
2553}
2554
2555static 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 */
2576int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
2577{
Bart Van Assche73930592018-07-18 09:25:25 -07002578 struct ib_send_wr *wr;
Long Lic7398582017-11-22 17:38:44 -07002579 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 Assche73930592018-07-18 09:25:25 -07002593 rc = ib_post_send(info->id->qp, wr, NULL);
Long Lic7398582017-11-22 17:38:44 -07002594 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
2614done:
2615 if (atomic_dec_and_test(&info->mr_used_count))
2616 wake_up(&info->wait_for_mr_cleanup);
2617
2618 return rc;
2619}