1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2017, Microsoft Corporation.
4 *
5 * Author(s): Long Li <longli@microsoft.com>
6 */
7 #include <linux/module.h>
8 #include <linux/highmem.h>
9 #include "smbdirect.h"
10 #include "cifs_debug.h"
11 #include "cifsproto.h"
12 #include "smb2proto.h"
13
14 static struct smbd_response *get_empty_queue_buffer(
15 struct smbd_connection *info);
16 static struct smbd_response *get_receive_buffer(
17 struct smbd_connection *info);
18 static void put_receive_buffer(
19 struct smbd_connection *info,
20 struct smbd_response *response);
21 static int allocate_receive_buffers(struct smbd_connection *info, int num_buf);
22 static void destroy_receive_buffers(struct smbd_connection *info);
23
24 static void put_empty_packet(
25 struct smbd_connection *info, struct smbd_response *response);
26 static void enqueue_reassembly(
27 struct smbd_connection *info,
28 struct smbd_response *response, int data_length);
29 static struct smbd_response *_get_first_reassembly(
30 struct smbd_connection *info);
31
32 static int smbd_post_recv(
33 struct smbd_connection *info,
34 struct smbd_response *response);
35
36 static int smbd_post_send_empty(struct smbd_connection *info);
37 static int smbd_post_send_data(
38 struct smbd_connection *info,
39 struct kvec *iov, int n_vec, int remaining_data_length);
40 static int smbd_post_send_page(struct smbd_connection *info,
41 struct page *page, unsigned long offset,
42 size_t size, int remaining_data_length);
43
44 static void destroy_mr_list(struct smbd_connection *info);
45 static int allocate_mr_list(struct smbd_connection *info);
46
47 /* SMBD version number */
48 #define SMBD_V1 0x0100
49
50 /* Port numbers for SMBD transport */
51 #define SMB_PORT 445
52 #define SMBD_PORT 5445
53
54 /* Address lookup and resolve timeout in ms */
55 #define RDMA_RESOLVE_TIMEOUT 5000
56
57 /* SMBD negotiation timeout in seconds */
58 #define SMBD_NEGOTIATE_TIMEOUT 120
59
60 /* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */
61 #define SMBD_MIN_RECEIVE_SIZE 128
62 #define SMBD_MIN_FRAGMENTED_SIZE 131072
63
64 /*
65 * Default maximum number of RDMA read/write outstanding on this connection
66 * This value is possibly decreased during QP creation on hardware limit
67 */
68 #define SMBD_CM_RESPONDER_RESOURCES 32
69
70 /* Maximum number of retries on data transfer operations */
71 #define SMBD_CM_RETRY 6
72 /* No need to retry on Receiver Not Ready since SMBD manages credits */
73 #define SMBD_CM_RNR_RETRY 0
74
75 /*
76 * User configurable initial values per SMBD transport connection
77 * as defined in [MS-SMBD] 3.1.1.1
78 * Those may change after a SMBD negotiation
79 */
80 /* The local peer's maximum number of credits to grant to the peer */
81 int smbd_receive_credit_max = 255;
82
83 /* The remote peer's credit request of local peer */
84 int smbd_send_credit_target = 255;
85
86 /* The maximum single message size can be sent to remote peer */
87 int smbd_max_send_size = 1364;
88
89 /* The maximum fragmented upper-layer payload receive size supported */
90 int smbd_max_fragmented_recv_size = 1024 * 1024;
91
92 /* The maximum single-message size which can be received */
93 int smbd_max_receive_size = 1364;
94
95 /* The timeout to initiate send of a keepalive message on idle */
96 int smbd_keep_alive_interval = 120;
97
98 /*
99 * User configurable initial values for RDMA transport
100 * The actual values used may be lower and are limited to hardware capabilities
101 */
102 /* Default maximum number of pages in a single RDMA write/read */
103 int smbd_max_frmr_depth = 2048;
104
105 /* If payload is less than this byte, use RDMA send/recv not read/write */
106 int rdma_readwrite_threshold = 4096;
107
108 /* Transport logging functions
109 * Logging are defined as classes. They can be OR'ed to define the actual
110 * logging level via module parameter smbd_logging_class
111 * e.g. cifs.smbd_logging_class=0xa0 will log all log_rdma_recv() and
112 * log_rdma_event()
113 */
114 #define LOG_OUTGOING 0x1
115 #define LOG_INCOMING 0x2
116 #define LOG_READ 0x4
117 #define LOG_WRITE 0x8
118 #define LOG_RDMA_SEND 0x10
119 #define LOG_RDMA_RECV 0x20
120 #define LOG_KEEP_ALIVE 0x40
121 #define LOG_RDMA_EVENT 0x80
122 #define LOG_RDMA_MR 0x100
123 static unsigned int smbd_logging_class;
124 module_param(smbd_logging_class, uint, 0644);
125 MODULE_PARM_DESC(smbd_logging_class,
126 "Logging class for SMBD transport 0x0 to 0x100");
127
128 #define ERR 0x0
129 #define INFO 0x1
130 static unsigned int smbd_logging_level = ERR;
131 module_param(smbd_logging_level, uint, 0644);
132 MODULE_PARM_DESC(smbd_logging_level,
133 "Logging level for SMBD transport, 0 (default): error, 1: info");
134
135 #define log_rdma(level, class, fmt, args...) \
136 do { \
137 if (level <= smbd_logging_level || class & smbd_logging_class) \
138 cifs_dbg(VFS, "%s:%d " fmt, __func__, __LINE__, ##args);\
139 } while (0)
140
141 #define log_outgoing(level, fmt, args...) \
142 log_rdma(level, LOG_OUTGOING, fmt, ##args)
143 #define log_incoming(level, fmt, args...) \
144 log_rdma(level, LOG_INCOMING, fmt, ##args)
145 #define log_read(level, fmt, args...) log_rdma(level, LOG_READ, fmt, ##args)
146 #define log_write(level, fmt, args...) log_rdma(level, LOG_WRITE, fmt, ##args)
147 #define log_rdma_send(level, fmt, args...) \
148 log_rdma(level, LOG_RDMA_SEND, fmt, ##args)
149 #define log_rdma_recv(level, fmt, args...) \
150 log_rdma(level, LOG_RDMA_RECV, fmt, ##args)
151 #define log_keep_alive(level, fmt, args...) \
152 log_rdma(level, LOG_KEEP_ALIVE, fmt, ##args)
153 #define log_rdma_event(level, fmt, args...) \
154 log_rdma(level, LOG_RDMA_EVENT, fmt, ##args)
155 #define log_rdma_mr(level, fmt, args...) \
156 log_rdma(level, LOG_RDMA_MR, fmt, ##args)
157
smbd_disconnect_rdma_work(struct work_struct * work)158 static void smbd_disconnect_rdma_work(struct work_struct *work)
159 {
160 struct smbd_connection *info =
161 container_of(work, struct smbd_connection, disconnect_work);
162
163 if (info->transport_status == SMBD_CONNECTED) {
164 info->transport_status = SMBD_DISCONNECTING;
165 rdma_disconnect(info->id);
166 }
167 }
168
smbd_disconnect_rdma_connection(struct smbd_connection * info)169 static void smbd_disconnect_rdma_connection(struct smbd_connection *info)
170 {
171 queue_work(info->workqueue, &info->disconnect_work);
172 }
173
174 /* Upcall from RDMA CM */
smbd_conn_upcall(struct rdma_cm_id * id,struct rdma_cm_event * event)175 static int smbd_conn_upcall(
176 struct rdma_cm_id *id, struct rdma_cm_event *event)
177 {
178 struct smbd_connection *info = id->context;
179
180 log_rdma_event(INFO, "event=%d status=%d\n",
181 event->event, event->status);
182
183 switch (event->event) {
184 case RDMA_CM_EVENT_ADDR_RESOLVED:
185 case RDMA_CM_EVENT_ROUTE_RESOLVED:
186 info->ri_rc = 0;
187 complete(&info->ri_done);
188 break;
189
190 case RDMA_CM_EVENT_ADDR_ERROR:
191 info->ri_rc = -EHOSTUNREACH;
192 complete(&info->ri_done);
193 break;
194
195 case RDMA_CM_EVENT_ROUTE_ERROR:
196 info->ri_rc = -ENETUNREACH;
197 complete(&info->ri_done);
198 break;
199
200 case RDMA_CM_EVENT_ESTABLISHED:
201 log_rdma_event(INFO, "connected event=%d\n", event->event);
202 info->transport_status = SMBD_CONNECTED;
203 wake_up_interruptible(&info->conn_wait);
204 break;
205
206 case RDMA_CM_EVENT_CONNECT_ERROR:
207 case RDMA_CM_EVENT_UNREACHABLE:
208 case RDMA_CM_EVENT_REJECTED:
209 log_rdma_event(INFO, "connecting failed event=%d\n", event->event);
210 info->transport_status = SMBD_DISCONNECTED;
211 wake_up_interruptible(&info->conn_wait);
212 break;
213
214 case RDMA_CM_EVENT_DEVICE_REMOVAL:
215 case RDMA_CM_EVENT_DISCONNECTED:
216 /* This happenes when we fail the negotiation */
217 if (info->transport_status == SMBD_NEGOTIATE_FAILED) {
218 info->transport_status = SMBD_DISCONNECTED;
219 wake_up(&info->conn_wait);
220 break;
221 }
222
223 info->transport_status = SMBD_DISCONNECTED;
224 wake_up_interruptible(&info->disconn_wait);
225 wake_up_interruptible(&info->wait_reassembly_queue);
226 wake_up_interruptible_all(&info->wait_send_queue);
227 break;
228
229 default:
230 break;
231 }
232
233 return 0;
234 }
235
236 /* Upcall from RDMA QP */
237 static void
smbd_qp_async_error_upcall(struct ib_event * event,void * context)238 smbd_qp_async_error_upcall(struct ib_event *event, void *context)
239 {
240 struct smbd_connection *info = context;
241
242 log_rdma_event(ERR, "%s on device %s info %p\n",
243 ib_event_msg(event->event), event->device->name, info);
244
245 switch (event->event) {
246 case IB_EVENT_CQ_ERR:
247 case IB_EVENT_QP_FATAL:
248 smbd_disconnect_rdma_connection(info);
249 break;
250
251 default:
252 break;
253 }
254 }
255
smbd_request_payload(struct smbd_request * request)256 static inline void *smbd_request_payload(struct smbd_request *request)
257 {
258 return (void *)request->packet;
259 }
260
smbd_response_payload(struct smbd_response * response)261 static inline void *smbd_response_payload(struct smbd_response *response)
262 {
263 return (void *)response->packet;
264 }
265
266 /* Called when a RDMA send is done */
send_done(struct ib_cq * cq,struct ib_wc * wc)267 static void send_done(struct ib_cq *cq, struct ib_wc *wc)
268 {
269 int i;
270 struct smbd_request *request =
271 container_of(wc->wr_cqe, struct smbd_request, cqe);
272
273 log_rdma_send(INFO, "smbd_request 0x%p completed wc->status=%d\n",
274 request, wc->status);
275
276 if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) {
277 log_rdma_send(ERR, "wc->status=%d wc->opcode=%d\n",
278 wc->status, wc->opcode);
279 smbd_disconnect_rdma_connection(request->info);
280 }
281
282 for (i = 0; i < request->num_sge; i++)
283 ib_dma_unmap_single(request->info->id->device,
284 request->sge[i].addr,
285 request->sge[i].length,
286 DMA_TO_DEVICE);
287
288 if (atomic_dec_and_test(&request->info->send_pending))
289 wake_up(&request->info->wait_send_pending);
290
291 wake_up(&request->info->wait_post_send);
292
293 mempool_free(request, request->info->request_mempool);
294 }
295
dump_smbd_negotiate_resp(struct smbd_negotiate_resp * resp)296 static void dump_smbd_negotiate_resp(struct smbd_negotiate_resp *resp)
297 {
298 log_rdma_event(INFO, "resp message min_version %u max_version %u negotiated_version %u credits_requested %u credits_granted %u status %u max_readwrite_size %u preferred_send_size %u max_receive_size %u max_fragmented_size %u\n",
299 resp->min_version, resp->max_version,
300 resp->negotiated_version, resp->credits_requested,
301 resp->credits_granted, resp->status,
302 resp->max_readwrite_size, resp->preferred_send_size,
303 resp->max_receive_size, resp->max_fragmented_size);
304 }
305
306 /*
307 * Process a negotiation response message, according to [MS-SMBD]3.1.5.7
308 * response, packet_length: the negotiation response message
309 * return value: true if negotiation is a success, false if failed
310 */
process_negotiation_response(struct smbd_response * response,int packet_length)311 static bool process_negotiation_response(
312 struct smbd_response *response, int packet_length)
313 {
314 struct smbd_connection *info = response->info;
315 struct smbd_negotiate_resp *packet = smbd_response_payload(response);
316
317 if (packet_length < sizeof(struct smbd_negotiate_resp)) {
318 log_rdma_event(ERR,
319 "error: packet_length=%d\n", packet_length);
320 return false;
321 }
322
323 if (le16_to_cpu(packet->negotiated_version) != SMBD_V1) {
324 log_rdma_event(ERR, "error: negotiated_version=%x\n",
325 le16_to_cpu(packet->negotiated_version));
326 return false;
327 }
328 info->protocol = le16_to_cpu(packet->negotiated_version);
329
330 if (packet->credits_requested == 0) {
331 log_rdma_event(ERR, "error: credits_requested==0\n");
332 return false;
333 }
334 info->receive_credit_target = le16_to_cpu(packet->credits_requested);
335
336 if (packet->credits_granted == 0) {
337 log_rdma_event(ERR, "error: credits_granted==0\n");
338 return false;
339 }
340 atomic_set(&info->send_credits, le16_to_cpu(packet->credits_granted));
341
342 atomic_set(&info->receive_credits, 0);
343
344 if (le32_to_cpu(packet->preferred_send_size) > info->max_receive_size) {
345 log_rdma_event(ERR, "error: preferred_send_size=%d\n",
346 le32_to_cpu(packet->preferred_send_size));
347 return false;
348 }
349 info->max_receive_size = le32_to_cpu(packet->preferred_send_size);
350
351 if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) {
352 log_rdma_event(ERR, "error: max_receive_size=%d\n",
353 le32_to_cpu(packet->max_receive_size));
354 return false;
355 }
356 info->max_send_size = min_t(int, info->max_send_size,
357 le32_to_cpu(packet->max_receive_size));
358
359 if (le32_to_cpu(packet->max_fragmented_size) <
360 SMBD_MIN_FRAGMENTED_SIZE) {
361 log_rdma_event(ERR, "error: max_fragmented_size=%d\n",
362 le32_to_cpu(packet->max_fragmented_size));
363 return false;
364 }
365 info->max_fragmented_send_size =
366 le32_to_cpu(packet->max_fragmented_size);
367 info->rdma_readwrite_threshold =
368 rdma_readwrite_threshold > info->max_fragmented_send_size ?
369 info->max_fragmented_send_size :
370 rdma_readwrite_threshold;
371
372
373 info->max_readwrite_size = min_t(u32,
374 le32_to_cpu(packet->max_readwrite_size),
375 info->max_frmr_depth * PAGE_SIZE);
376 info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE;
377
378 return true;
379 }
380
smbd_post_send_credits(struct work_struct * work)381 static void smbd_post_send_credits(struct work_struct *work)
382 {
383 int ret = 0;
384 int use_receive_queue = 1;
385 int rc;
386 struct smbd_response *response;
387 struct smbd_connection *info =
388 container_of(work, struct smbd_connection,
389 post_send_credits_work);
390
391 if (info->transport_status != SMBD_CONNECTED) {
392 wake_up(&info->wait_receive_queues);
393 return;
394 }
395
396 if (info->receive_credit_target >
397 atomic_read(&info->receive_credits)) {
398 while (true) {
399 if (use_receive_queue)
400 response = get_receive_buffer(info);
401 else
402 response = get_empty_queue_buffer(info);
403 if (!response) {
404 /* now switch to emtpy packet queue */
405 if (use_receive_queue) {
406 use_receive_queue = 0;
407 continue;
408 } else
409 break;
410 }
411
412 response->type = SMBD_TRANSFER_DATA;
413 response->first_segment = false;
414 rc = smbd_post_recv(info, response);
415 if (rc) {
416 log_rdma_recv(ERR,
417 "post_recv failed rc=%d\n", rc);
418 put_receive_buffer(info, response);
419 break;
420 }
421
422 ret++;
423 }
424 }
425
426 spin_lock(&info->lock_new_credits_offered);
427 info->new_credits_offered += ret;
428 spin_unlock(&info->lock_new_credits_offered);
429
430 /* Promptly send an immediate packet as defined in [MS-SMBD] 3.1.1.1 */
431 info->send_immediate = true;
432 if (atomic_read(&info->receive_credits) <
433 info->receive_credit_target - 1) {
434 if (info->keep_alive_requested == KEEP_ALIVE_PENDING ||
435 info->send_immediate) {
436 log_keep_alive(INFO, "send an empty message\n");
437 smbd_post_send_empty(info);
438 }
439 }
440 }
441
442 /* Called from softirq, when recv is done */
recv_done(struct ib_cq * cq,struct ib_wc * wc)443 static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
444 {
445 struct smbd_data_transfer *data_transfer;
446 struct smbd_response *response =
447 container_of(wc->wr_cqe, struct smbd_response, cqe);
448 struct smbd_connection *info = response->info;
449 int data_length = 0;
450
451 log_rdma_recv(INFO, "response=0x%p type=%d wc status=%d wc opcode %d byte_len=%d pkey_index=%u\n",
452 response, response->type, wc->status, wc->opcode,
453 wc->byte_len, wc->pkey_index);
454
455 if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) {
456 log_rdma_recv(INFO, "wc->status=%d opcode=%d\n",
457 wc->status, wc->opcode);
458 smbd_disconnect_rdma_connection(info);
459 goto error;
460 }
461
462 ib_dma_sync_single_for_cpu(
463 wc->qp->device,
464 response->sge.addr,
465 response->sge.length,
466 DMA_FROM_DEVICE);
467
468 switch (response->type) {
469 /* SMBD negotiation response */
470 case SMBD_NEGOTIATE_RESP:
471 dump_smbd_negotiate_resp(smbd_response_payload(response));
472 info->full_packet_received = true;
473 info->negotiate_done =
474 process_negotiation_response(response, wc->byte_len);
475 complete(&info->negotiate_completion);
476 break;
477
478 /* SMBD data transfer packet */
479 case SMBD_TRANSFER_DATA:
480 data_transfer = smbd_response_payload(response);
481 data_length = le32_to_cpu(data_transfer->data_length);
482
483 /*
484 * If this is a packet with data playload place the data in
485 * reassembly queue and wake up the reading thread
486 */
487 if (data_length) {
488 if (info->full_packet_received)
489 response->first_segment = true;
490
491 if (le32_to_cpu(data_transfer->remaining_data_length))
492 info->full_packet_received = false;
493 else
494 info->full_packet_received = true;
495
496 enqueue_reassembly(
497 info,
498 response,
499 data_length);
500 } else
501 put_empty_packet(info, response);
502
503 if (data_length)
504 wake_up_interruptible(&info->wait_reassembly_queue);
505
506 atomic_dec(&info->receive_credits);
507 info->receive_credit_target =
508 le16_to_cpu(data_transfer->credits_requested);
509 if (le16_to_cpu(data_transfer->credits_granted)) {
510 atomic_add(le16_to_cpu(data_transfer->credits_granted),
511 &info->send_credits);
512 /*
513 * We have new send credits granted from remote peer
514 * If any sender is waiting for credits, unblock it
515 */
516 wake_up_interruptible(&info->wait_send_queue);
517 }
518
519 log_incoming(INFO, "data flags %d data_offset %d data_length %d remaining_data_length %d\n",
520 le16_to_cpu(data_transfer->flags),
521 le32_to_cpu(data_transfer->data_offset),
522 le32_to_cpu(data_transfer->data_length),
523 le32_to_cpu(data_transfer->remaining_data_length));
524
525 /* Send a KEEP_ALIVE response right away if requested */
526 info->keep_alive_requested = KEEP_ALIVE_NONE;
527 if (le16_to_cpu(data_transfer->flags) &
528 SMB_DIRECT_RESPONSE_REQUESTED) {
529 info->keep_alive_requested = KEEP_ALIVE_PENDING;
530 }
531
532 return;
533
534 default:
535 log_rdma_recv(ERR,
536 "unexpected response type=%d\n", response->type);
537 }
538
539 error:
540 put_receive_buffer(info, response);
541 }
542
smbd_create_id(struct smbd_connection * info,struct sockaddr * dstaddr,int port)543 static struct rdma_cm_id *smbd_create_id(
544 struct smbd_connection *info,
545 struct sockaddr *dstaddr, int port)
546 {
547 struct rdma_cm_id *id;
548 int rc;
549 __be16 *sport;
550
551 id = rdma_create_id(&init_net, smbd_conn_upcall, info,
552 RDMA_PS_TCP, IB_QPT_RC);
553 if (IS_ERR(id)) {
554 rc = PTR_ERR(id);
555 log_rdma_event(ERR, "rdma_create_id() failed %i\n", rc);
556 return id;
557 }
558
559 if (dstaddr->sa_family == AF_INET6)
560 sport = &((struct sockaddr_in6 *)dstaddr)->sin6_port;
561 else
562 sport = &((struct sockaddr_in *)dstaddr)->sin_port;
563
564 *sport = htons(port);
565
566 init_completion(&info->ri_done);
567 info->ri_rc = -ETIMEDOUT;
568
569 rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr,
570 RDMA_RESOLVE_TIMEOUT);
571 if (rc) {
572 log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc);
573 goto out;
574 }
575 rc = wait_for_completion_interruptible_timeout(
576 &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
577 /* e.g. if interrupted returns -ERESTARTSYS */
578 if (rc < 0) {
579 log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
580 goto out;
581 }
582 rc = info->ri_rc;
583 if (rc) {
584 log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc);
585 goto out;
586 }
587
588 info->ri_rc = -ETIMEDOUT;
589 rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
590 if (rc) {
591 log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc);
592 goto out;
593 }
594 rc = wait_for_completion_interruptible_timeout(
595 &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
596 /* e.g. if interrupted returns -ERESTARTSYS */
597 if (rc < 0) {
598 log_rdma_event(ERR, "rdma_resolve_addr timeout rc: %i\n", rc);
599 goto out;
600 }
601 rc = info->ri_rc;
602 if (rc) {
603 log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc);
604 goto out;
605 }
606
607 return id;
608
609 out:
610 rdma_destroy_id(id);
611 return ERR_PTR(rc);
612 }
613
614 /*
615 * Test if FRWR (Fast Registration Work Requests) is supported on the device
616 * This implementation requries FRWR on RDMA read/write
617 * return value: true if it is supported
618 */
frwr_is_supported(struct ib_device_attr * attrs)619 static bool frwr_is_supported(struct ib_device_attr *attrs)
620 {
621 if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
622 return false;
623 if (attrs->max_fast_reg_page_list_len == 0)
624 return false;
625 return true;
626 }
627
smbd_ia_open(struct smbd_connection * info,struct sockaddr * dstaddr,int port)628 static int smbd_ia_open(
629 struct smbd_connection *info,
630 struct sockaddr *dstaddr, int port)
631 {
632 int rc;
633
634 info->id = smbd_create_id(info, dstaddr, port);
635 if (IS_ERR(info->id)) {
636 rc = PTR_ERR(info->id);
637 goto out1;
638 }
639
640 if (!frwr_is_supported(&info->id->device->attrs)) {
641 log_rdma_event(ERR, "Fast Registration Work Requests (FRWR) is not supported\n");
642 log_rdma_event(ERR, "Device capability flags = %llx max_fast_reg_page_list_len = %u\n",
643 info->id->device->attrs.device_cap_flags,
644 info->id->device->attrs.max_fast_reg_page_list_len);
645 rc = -EPROTONOSUPPORT;
646 goto out2;
647 }
648 info->max_frmr_depth = min_t(int,
649 smbd_max_frmr_depth,
650 info->id->device->attrs.max_fast_reg_page_list_len);
651 info->mr_type = IB_MR_TYPE_MEM_REG;
652 if (info->id->device->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)
653 info->mr_type = IB_MR_TYPE_SG_GAPS;
654
655 info->pd = ib_alloc_pd(info->id->device, 0);
656 if (IS_ERR(info->pd)) {
657 rc = PTR_ERR(info->pd);
658 log_rdma_event(ERR, "ib_alloc_pd() returned %d\n", rc);
659 goto out2;
660 }
661
662 return 0;
663
664 out2:
665 rdma_destroy_id(info->id);
666 info->id = NULL;
667
668 out1:
669 return rc;
670 }
671
672 /*
673 * Send a negotiation request message to the peer
674 * The negotiation procedure is in [MS-SMBD] 3.1.5.2 and 3.1.5.3
675 * After negotiation, the transport is connected and ready for
676 * carrying upper layer SMB payload
677 */
smbd_post_send_negotiate_req(struct smbd_connection * info)678 static int smbd_post_send_negotiate_req(struct smbd_connection *info)
679 {
680 struct ib_send_wr send_wr;
681 int rc = -ENOMEM;
682 struct smbd_request *request;
683 struct smbd_negotiate_req *packet;
684
685 request = mempool_alloc(info->request_mempool, GFP_KERNEL);
686 if (!request)
687 return rc;
688
689 request->info = info;
690
691 packet = smbd_request_payload(request);
692 packet->min_version = cpu_to_le16(SMBD_V1);
693 packet->max_version = cpu_to_le16(SMBD_V1);
694 packet->reserved = 0;
695 packet->credits_requested = cpu_to_le16(info->send_credit_target);
696 packet->preferred_send_size = cpu_to_le32(info->max_send_size);
697 packet->max_receive_size = cpu_to_le32(info->max_receive_size);
698 packet->max_fragmented_size =
699 cpu_to_le32(info->max_fragmented_recv_size);
700
701 request->num_sge = 1;
702 request->sge[0].addr = ib_dma_map_single(
703 info->id->device, (void *)packet,
704 sizeof(*packet), DMA_TO_DEVICE);
705 if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
706 rc = -EIO;
707 goto dma_mapping_failed;
708 }
709
710 request->sge[0].length = sizeof(*packet);
711 request->sge[0].lkey = info->pd->local_dma_lkey;
712
713 ib_dma_sync_single_for_device(
714 info->id->device, request->sge[0].addr,
715 request->sge[0].length, DMA_TO_DEVICE);
716
717 request->cqe.done = send_done;
718
719 send_wr.next = NULL;
720 send_wr.wr_cqe = &request->cqe;
721 send_wr.sg_list = request->sge;
722 send_wr.num_sge = request->num_sge;
723 send_wr.opcode = IB_WR_SEND;
724 send_wr.send_flags = IB_SEND_SIGNALED;
725
726 log_rdma_send(INFO, "sge addr=0x%llx length=%u lkey=0x%x\n",
727 request->sge[0].addr,
728 request->sge[0].length, request->sge[0].lkey);
729
730 atomic_inc(&info->send_pending);
731 rc = ib_post_send(info->id->qp, &send_wr, NULL);
732 if (!rc)
733 return 0;
734
735 /* if we reach here, post send failed */
736 log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
737 atomic_dec(&info->send_pending);
738 ib_dma_unmap_single(info->id->device, request->sge[0].addr,
739 request->sge[0].length, DMA_TO_DEVICE);
740
741 smbd_disconnect_rdma_connection(info);
742
743 dma_mapping_failed:
744 mempool_free(request, info->request_mempool);
745 return rc;
746 }
747
748 /*
749 * Extend the credits to remote peer
750 * This implements [MS-SMBD] 3.1.5.9
751 * The idea is that we should extend credits to remote peer as quickly as
752 * it's allowed, to maintain data flow. We allocate as much receive
753 * buffer as possible, and extend the receive credits to remote peer
754 * return value: the new credtis being granted.
755 */
manage_credits_prior_sending(struct smbd_connection * info)756 static int manage_credits_prior_sending(struct smbd_connection *info)
757 {
758 int new_credits;
759
760 spin_lock(&info->lock_new_credits_offered);
761 new_credits = info->new_credits_offered;
762 info->new_credits_offered = 0;
763 spin_unlock(&info->lock_new_credits_offered);
764
765 return new_credits;
766 }
767
768 /*
769 * Check if we need to send a KEEP_ALIVE message
770 * The idle connection timer triggers a KEEP_ALIVE message when expires
771 * SMB_DIRECT_RESPONSE_REQUESTED is set in the message flag to have peer send
772 * back a response.
773 * return value:
774 * 1 if SMB_DIRECT_RESPONSE_REQUESTED needs to be set
775 * 0: otherwise
776 */
manage_keep_alive_before_sending(struct smbd_connection * info)777 static int manage_keep_alive_before_sending(struct smbd_connection *info)
778 {
779 if (info->keep_alive_requested == KEEP_ALIVE_PENDING) {
780 info->keep_alive_requested = KEEP_ALIVE_SENT;
781 return 1;
782 }
783 return 0;
784 }
785
786 /* Post the send request */
smbd_post_send(struct smbd_connection * info,struct smbd_request * request)787 static int smbd_post_send(struct smbd_connection *info,
788 struct smbd_request *request)
789 {
790 struct ib_send_wr send_wr;
791 int rc, i;
792
793 for (i = 0; i < request->num_sge; i++) {
794 log_rdma_send(INFO,
795 "rdma_request sge[%d] addr=0x%llx length=%u\n",
796 i, request->sge[i].addr, request->sge[i].length);
797 ib_dma_sync_single_for_device(
798 info->id->device,
799 request->sge[i].addr,
800 request->sge[i].length,
801 DMA_TO_DEVICE);
802 }
803
804 request->cqe.done = send_done;
805
806 send_wr.next = NULL;
807 send_wr.wr_cqe = &request->cqe;
808 send_wr.sg_list = request->sge;
809 send_wr.num_sge = request->num_sge;
810 send_wr.opcode = IB_WR_SEND;
811 send_wr.send_flags = IB_SEND_SIGNALED;
812
813 rc = ib_post_send(info->id->qp, &send_wr, NULL);
814 if (rc) {
815 log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc);
816 smbd_disconnect_rdma_connection(info);
817 rc = -EAGAIN;
818 } else
819 /* Reset timer for idle connection after packet is sent */
820 mod_delayed_work(info->workqueue, &info->idle_timer_work,
821 info->keep_alive_interval*HZ);
822
823 return rc;
824 }
825
smbd_post_send_sgl(struct smbd_connection * info,struct scatterlist * sgl,int data_length,int remaining_data_length)826 static int smbd_post_send_sgl(struct smbd_connection *info,
827 struct scatterlist *sgl, int data_length, int remaining_data_length)
828 {
829 int num_sgs;
830 int i, rc;
831 int header_length;
832 struct smbd_request *request;
833 struct smbd_data_transfer *packet;
834 int new_credits;
835 struct scatterlist *sg;
836
837 wait_credit:
838 /* Wait for send credits. A SMBD packet needs one credit */
839 rc = wait_event_interruptible(info->wait_send_queue,
840 atomic_read(&info->send_credits) > 0 ||
841 info->transport_status != SMBD_CONNECTED);
842 if (rc)
843 goto err_wait_credit;
844
845 if (info->transport_status != SMBD_CONNECTED) {
846 log_outgoing(ERR, "disconnected not sending on wait_credit\n");
847 rc = -EAGAIN;
848 goto err_wait_credit;
849 }
850 if (unlikely(atomic_dec_return(&info->send_credits) < 0)) {
851 atomic_inc(&info->send_credits);
852 goto wait_credit;
853 }
854
855 wait_send_queue:
856 wait_event(info->wait_post_send,
857 atomic_read(&info->send_pending) < info->send_credit_target ||
858 info->transport_status != SMBD_CONNECTED);
859
860 if (info->transport_status != SMBD_CONNECTED) {
861 log_outgoing(ERR, "disconnected not sending on wait_send_queue\n");
862 rc = -EAGAIN;
863 goto err_wait_send_queue;
864 }
865
866 if (unlikely(atomic_inc_return(&info->send_pending) >
867 info->send_credit_target)) {
868 atomic_dec(&info->send_pending);
869 goto wait_send_queue;
870 }
871
872 request = mempool_alloc(info->request_mempool, GFP_KERNEL);
873 if (!request) {
874 rc = -ENOMEM;
875 goto err_alloc;
876 }
877
878 request->info = info;
879
880 /* Fill in the packet header */
881 packet = smbd_request_payload(request);
882 packet->credits_requested = cpu_to_le16(info->send_credit_target);
883
884 new_credits = manage_credits_prior_sending(info);
885 atomic_add(new_credits, &info->receive_credits);
886 packet->credits_granted = cpu_to_le16(new_credits);
887
888 info->send_immediate = false;
889
890 packet->flags = 0;
891 if (manage_keep_alive_before_sending(info))
892 packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED);
893
894 packet->reserved = 0;
895 if (!data_length)
896 packet->data_offset = 0;
897 else
898 packet->data_offset = cpu_to_le32(24);
899 packet->data_length = cpu_to_le32(data_length);
900 packet->remaining_data_length = cpu_to_le32(remaining_data_length);
901 packet->padding = 0;
902
903 log_outgoing(INFO, "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n",
904 le16_to_cpu(packet->credits_requested),
905 le16_to_cpu(packet->credits_granted),
906 le32_to_cpu(packet->data_offset),
907 le32_to_cpu(packet->data_length),
908 le32_to_cpu(packet->remaining_data_length));
909
910 /* Map the packet to DMA */
911 header_length = sizeof(struct smbd_data_transfer);
912 /* If this is a packet without payload, don't send padding */
913 if (!data_length)
914 header_length = offsetof(struct smbd_data_transfer, padding);
915
916 request->num_sge = 1;
917 request->sge[0].addr = ib_dma_map_single(info->id->device,
918 (void *)packet,
919 header_length,
920 DMA_TO_DEVICE);
921 if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) {
922 rc = -EIO;
923 request->sge[0].addr = 0;
924 goto err_dma;
925 }
926
927 request->sge[0].length = header_length;
928 request->sge[0].lkey = info->pd->local_dma_lkey;
929
930 /* Fill in the packet data payload */
931 num_sgs = sgl ? sg_nents(sgl) : 0;
932 for_each_sg(sgl, sg, num_sgs, i) {
933 request->sge[i+1].addr =
934 ib_dma_map_page(info->id->device, sg_page(sg),
935 sg->offset, sg->length, DMA_TO_DEVICE);
936 if (ib_dma_mapping_error(
937 info->id->device, request->sge[i+1].addr)) {
938 rc = -EIO;
939 request->sge[i+1].addr = 0;
940 goto err_dma;
941 }
942 request->sge[i+1].length = sg->length;
943 request->sge[i+1].lkey = info->pd->local_dma_lkey;
944 request->num_sge++;
945 }
946
947 rc = smbd_post_send(info, request);
948 if (!rc)
949 return 0;
950
951 err_dma:
952 for (i = 0; i < request->num_sge; i++)
953 if (request->sge[i].addr)
954 ib_dma_unmap_single(info->id->device,
955 request->sge[i].addr,
956 request->sge[i].length,
957 DMA_TO_DEVICE);
958 mempool_free(request, info->request_mempool);
959
960 /* roll back receive credits and credits to be offered */
961 spin_lock(&info->lock_new_credits_offered);
962 info->new_credits_offered += new_credits;
963 spin_unlock(&info->lock_new_credits_offered);
964 atomic_sub(new_credits, &info->receive_credits);
965
966 err_alloc:
967 if (atomic_dec_and_test(&info->send_pending))
968 wake_up(&info->wait_send_pending);
969
970 err_wait_send_queue:
971 /* roll back send credits and pending */
972 atomic_inc(&info->send_credits);
973
974 err_wait_credit:
975 return rc;
976 }
977
978 /*
979 * Send a page
980 * page: the page to send
981 * offset: offset in the page to send
982 * size: length in the page to send
983 * remaining_data_length: remaining data to send in this payload
984 */
smbd_post_send_page(struct smbd_connection * info,struct page * page,unsigned long offset,size_t size,int remaining_data_length)985 static int smbd_post_send_page(struct smbd_connection *info, struct page *page,
986 unsigned long offset, size_t size, int remaining_data_length)
987 {
988 struct scatterlist sgl;
989
990 sg_init_table(&sgl, 1);
991 sg_set_page(&sgl, page, size, offset);
992
993 return smbd_post_send_sgl(info, &sgl, size, remaining_data_length);
994 }
995
996 /*
997 * Send an empty message
998 * Empty message is used to extend credits to peer to for keep live
999 * while there is no upper layer payload to send at the time
1000 */
smbd_post_send_empty(struct smbd_connection * info)1001 static int smbd_post_send_empty(struct smbd_connection *info)
1002 {
1003 info->count_send_empty++;
1004 return smbd_post_send_sgl(info, NULL, 0, 0);
1005 }
1006
1007 /*
1008 * Send a data buffer
1009 * iov: the iov array describing the data buffers
1010 * n_vec: number of iov array
1011 * remaining_data_length: remaining data to send following this packet
1012 * in segmented SMBD packet
1013 */
smbd_post_send_data(struct smbd_connection * info,struct kvec * iov,int n_vec,int remaining_data_length)1014 static int smbd_post_send_data(
1015 struct smbd_connection *info, struct kvec *iov, int n_vec,
1016 int remaining_data_length)
1017 {
1018 int i;
1019 u32 data_length = 0;
1020 struct scatterlist sgl[SMBDIRECT_MAX_SEND_SGE - 1];
1021
1022 if (n_vec > SMBDIRECT_MAX_SEND_SGE - 1) {
1023 cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec);
1024 return -EINVAL;
1025 }
1026
1027 sg_init_table(sgl, n_vec);
1028 for (i = 0; i < n_vec; i++) {
1029 data_length += iov[i].iov_len;
1030 sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len);
1031 }
1032
1033 return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length);
1034 }
1035
1036 /*
1037 * Post a receive request to the transport
1038 * The remote peer can only send data when a receive request is posted
1039 * The interaction is controlled by send/receive credit system
1040 */
smbd_post_recv(struct smbd_connection * info,struct smbd_response * response)1041 static int smbd_post_recv(
1042 struct smbd_connection *info, struct smbd_response *response)
1043 {
1044 struct ib_recv_wr recv_wr;
1045 int rc = -EIO;
1046
1047 response->sge.addr = ib_dma_map_single(
1048 info->id->device, response->packet,
1049 info->max_receive_size, DMA_FROM_DEVICE);
1050 if (ib_dma_mapping_error(info->id->device, response->sge.addr))
1051 return rc;
1052
1053 response->sge.length = info->max_receive_size;
1054 response->sge.lkey = info->pd->local_dma_lkey;
1055
1056 response->cqe.done = recv_done;
1057
1058 recv_wr.wr_cqe = &response->cqe;
1059 recv_wr.next = NULL;
1060 recv_wr.sg_list = &response->sge;
1061 recv_wr.num_sge = 1;
1062
1063 rc = ib_post_recv(info->id->qp, &recv_wr, NULL);
1064 if (rc) {
1065 ib_dma_unmap_single(info->id->device, response->sge.addr,
1066 response->sge.length, DMA_FROM_DEVICE);
1067 smbd_disconnect_rdma_connection(info);
1068 log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc);
1069 }
1070
1071 return rc;
1072 }
1073
1074 /* Perform SMBD negotiate according to [MS-SMBD] 3.1.5.2 */
smbd_negotiate(struct smbd_connection * info)1075 static int smbd_negotiate(struct smbd_connection *info)
1076 {
1077 int rc;
1078 struct smbd_response *response = get_receive_buffer(info);
1079
1080 response->type = SMBD_NEGOTIATE_RESP;
1081 rc = smbd_post_recv(info, response);
1082 log_rdma_event(INFO, "smbd_post_recv rc=%d iov.addr=0x%llx iov.length=%u iov.lkey=0x%x\n",
1083 rc, response->sge.addr,
1084 response->sge.length, response->sge.lkey);
1085 if (rc)
1086 return rc;
1087
1088 init_completion(&info->negotiate_completion);
1089 info->negotiate_done = false;
1090 rc = smbd_post_send_negotiate_req(info);
1091 if (rc)
1092 return rc;
1093
1094 rc = wait_for_completion_interruptible_timeout(
1095 &info->negotiate_completion, SMBD_NEGOTIATE_TIMEOUT * HZ);
1096 log_rdma_event(INFO, "wait_for_completion_timeout rc=%d\n", rc);
1097
1098 if (info->negotiate_done)
1099 return 0;
1100
1101 if (rc == 0)
1102 rc = -ETIMEDOUT;
1103 else if (rc == -ERESTARTSYS)
1104 rc = -EINTR;
1105 else
1106 rc = -ENOTCONN;
1107
1108 return rc;
1109 }
1110
put_empty_packet(struct smbd_connection * info,struct smbd_response * response)1111 static void put_empty_packet(
1112 struct smbd_connection *info, struct smbd_response *response)
1113 {
1114 spin_lock(&info->empty_packet_queue_lock);
1115 list_add_tail(&response->list, &info->empty_packet_queue);
1116 info->count_empty_packet_queue++;
1117 spin_unlock(&info->empty_packet_queue_lock);
1118
1119 queue_work(info->workqueue, &info->post_send_credits_work);
1120 }
1121
1122 /*
1123 * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1
1124 * This is a queue for reassembling upper layer payload and present to upper
1125 * layer. All the inncoming payload go to the reassembly queue, regardless of
1126 * if reassembly is required. The uuper layer code reads from the queue for all
1127 * incoming payloads.
1128 * Put a received packet to the reassembly queue
1129 * response: the packet received
1130 * data_length: the size of payload in this packet
1131 */
enqueue_reassembly(struct smbd_connection * info,struct smbd_response * response,int data_length)1132 static void enqueue_reassembly(
1133 struct smbd_connection *info,
1134 struct smbd_response *response,
1135 int data_length)
1136 {
1137 spin_lock(&info->reassembly_queue_lock);
1138 list_add_tail(&response->list, &info->reassembly_queue);
1139 info->reassembly_queue_length++;
1140 /*
1141 * Make sure reassembly_data_length is updated after list and
1142 * reassembly_queue_length are updated. On the dequeue side
1143 * reassembly_data_length is checked without a lock to determine
1144 * if reassembly_queue_length and list is up to date
1145 */
1146 virt_wmb();
1147 info->reassembly_data_length += data_length;
1148 spin_unlock(&info->reassembly_queue_lock);
1149 info->count_reassembly_queue++;
1150 info->count_enqueue_reassembly_queue++;
1151 }
1152
1153 /*
1154 * Get the first entry at the front of reassembly queue
1155 * Caller is responsible for locking
1156 * return value: the first entry if any, NULL if queue is empty
1157 */
_get_first_reassembly(struct smbd_connection * info)1158 static struct smbd_response *_get_first_reassembly(struct smbd_connection *info)
1159 {
1160 struct smbd_response *ret = NULL;
1161
1162 if (!list_empty(&info->reassembly_queue)) {
1163 ret = list_first_entry(
1164 &info->reassembly_queue,
1165 struct smbd_response, list);
1166 }
1167 return ret;
1168 }
1169
get_empty_queue_buffer(struct smbd_connection * info)1170 static struct smbd_response *get_empty_queue_buffer(
1171 struct smbd_connection *info)
1172 {
1173 struct smbd_response *ret = NULL;
1174 unsigned long flags;
1175
1176 spin_lock_irqsave(&info->empty_packet_queue_lock, flags);
1177 if (!list_empty(&info->empty_packet_queue)) {
1178 ret = list_first_entry(
1179 &info->empty_packet_queue,
1180 struct smbd_response, list);
1181 list_del(&ret->list);
1182 info->count_empty_packet_queue--;
1183 }
1184 spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags);
1185
1186 return ret;
1187 }
1188
1189 /*
1190 * Get a receive buffer
1191 * For each remote send, we need to post a receive. The receive buffers are
1192 * pre-allocated in advance.
1193 * return value: the receive buffer, NULL if none is available
1194 */
get_receive_buffer(struct smbd_connection * info)1195 static struct smbd_response *get_receive_buffer(struct smbd_connection *info)
1196 {
1197 struct smbd_response *ret = NULL;
1198 unsigned long flags;
1199
1200 spin_lock_irqsave(&info->receive_queue_lock, flags);
1201 if (!list_empty(&info->receive_queue)) {
1202 ret = list_first_entry(
1203 &info->receive_queue,
1204 struct smbd_response, list);
1205 list_del(&ret->list);
1206 info->count_receive_queue--;
1207 info->count_get_receive_buffer++;
1208 }
1209 spin_unlock_irqrestore(&info->receive_queue_lock, flags);
1210
1211 return ret;
1212 }
1213
1214 /*
1215 * Return a receive buffer
1216 * Upon returning of a receive buffer, we can post new receive and extend
1217 * more receive credits to remote peer. This is done immediately after a
1218 * receive buffer is returned.
1219 */
put_receive_buffer(struct smbd_connection * info,struct smbd_response * response)1220 static void put_receive_buffer(
1221 struct smbd_connection *info, struct smbd_response *response)
1222 {
1223 unsigned long flags;
1224
1225 ib_dma_unmap_single(info->id->device, response->sge.addr,
1226 response->sge.length, DMA_FROM_DEVICE);
1227
1228 spin_lock_irqsave(&info->receive_queue_lock, flags);
1229 list_add_tail(&response->list, &info->receive_queue);
1230 info->count_receive_queue++;
1231 info->count_put_receive_buffer++;
1232 spin_unlock_irqrestore(&info->receive_queue_lock, flags);
1233
1234 queue_work(info->workqueue, &info->post_send_credits_work);
1235 }
1236
1237 /* Preallocate all receive buffer on transport establishment */
allocate_receive_buffers(struct smbd_connection * info,int num_buf)1238 static int allocate_receive_buffers(struct smbd_connection *info, int num_buf)
1239 {
1240 int i;
1241 struct smbd_response *response;
1242
1243 INIT_LIST_HEAD(&info->reassembly_queue);
1244 spin_lock_init(&info->reassembly_queue_lock);
1245 info->reassembly_data_length = 0;
1246 info->reassembly_queue_length = 0;
1247
1248 INIT_LIST_HEAD(&info->receive_queue);
1249 spin_lock_init(&info->receive_queue_lock);
1250 info->count_receive_queue = 0;
1251
1252 INIT_LIST_HEAD(&info->empty_packet_queue);
1253 spin_lock_init(&info->empty_packet_queue_lock);
1254 info->count_empty_packet_queue = 0;
1255
1256 init_waitqueue_head(&info->wait_receive_queues);
1257
1258 for (i = 0; i < num_buf; i++) {
1259 response = mempool_alloc(info->response_mempool, GFP_KERNEL);
1260 if (!response)
1261 goto allocate_failed;
1262
1263 response->info = info;
1264 list_add_tail(&response->list, &info->receive_queue);
1265 info->count_receive_queue++;
1266 }
1267
1268 return 0;
1269
1270 allocate_failed:
1271 while (!list_empty(&info->receive_queue)) {
1272 response = list_first_entry(
1273 &info->receive_queue,
1274 struct smbd_response, list);
1275 list_del(&response->list);
1276 info->count_receive_queue--;
1277
1278 mempool_free(response, info->response_mempool);
1279 }
1280 return -ENOMEM;
1281 }
1282
destroy_receive_buffers(struct smbd_connection * info)1283 static void destroy_receive_buffers(struct smbd_connection *info)
1284 {
1285 struct smbd_response *response;
1286
1287 while ((response = get_receive_buffer(info)))
1288 mempool_free(response, info->response_mempool);
1289
1290 while ((response = get_empty_queue_buffer(info)))
1291 mempool_free(response, info->response_mempool);
1292 }
1293
1294 /* Implement idle connection timer [MS-SMBD] 3.1.6.2 */
idle_connection_timer(struct work_struct * work)1295 static void idle_connection_timer(struct work_struct *work)
1296 {
1297 struct smbd_connection *info = container_of(
1298 work, struct smbd_connection,
1299 idle_timer_work.work);
1300
1301 if (info->keep_alive_requested != KEEP_ALIVE_NONE) {
1302 log_keep_alive(ERR,
1303 "error status info->keep_alive_requested=%d\n",
1304 info->keep_alive_requested);
1305 smbd_disconnect_rdma_connection(info);
1306 return;
1307 }
1308
1309 log_keep_alive(INFO, "about to send an empty idle message\n");
1310 smbd_post_send_empty(info);
1311
1312 /* Setup the next idle timeout work */
1313 queue_delayed_work(info->workqueue, &info->idle_timer_work,
1314 info->keep_alive_interval*HZ);
1315 }
1316
1317 /*
1318 * Destroy the transport and related RDMA and memory resources
1319 * Need to go through all the pending counters and make sure on one is using
1320 * the transport while it is destroyed
1321 */
smbd_destroy(struct TCP_Server_Info * server)1322 void smbd_destroy(struct TCP_Server_Info *server)
1323 {
1324 struct smbd_connection *info = server->smbd_conn;
1325 struct smbd_response *response;
1326 unsigned long flags;
1327
1328 if (!info) {
1329 log_rdma_event(INFO, "rdma session already destroyed\n");
1330 return;
1331 }
1332
1333 log_rdma_event(INFO, "destroying rdma session\n");
1334 if (info->transport_status != SMBD_DISCONNECTED) {
1335 rdma_disconnect(server->smbd_conn->id);
1336 log_rdma_event(INFO, "wait for transport being disconnected\n");
1337 wait_event_interruptible(
1338 info->disconn_wait,
1339 info->transport_status == SMBD_DISCONNECTED);
1340 }
1341
1342 log_rdma_event(INFO, "destroying qp\n");
1343 ib_drain_qp(info->id->qp);
1344 rdma_destroy_qp(info->id);
1345
1346 log_rdma_event(INFO, "cancelling idle timer\n");
1347 cancel_delayed_work_sync(&info->idle_timer_work);
1348
1349 log_rdma_event(INFO, "wait for all send posted to IB to finish\n");
1350 wait_event(info->wait_send_pending,
1351 atomic_read(&info->send_pending) == 0);
1352
1353 /* It's not possible for upper layer to get to reassembly */
1354 log_rdma_event(INFO, "drain the reassembly queue\n");
1355 do {
1356 spin_lock_irqsave(&info->reassembly_queue_lock, flags);
1357 response = _get_first_reassembly(info);
1358 if (response) {
1359 list_del(&response->list);
1360 spin_unlock_irqrestore(
1361 &info->reassembly_queue_lock, flags);
1362 put_receive_buffer(info, response);
1363 } else
1364 spin_unlock_irqrestore(
1365 &info->reassembly_queue_lock, flags);
1366 } while (response);
1367 info->reassembly_data_length = 0;
1368
1369 log_rdma_event(INFO, "free receive buffers\n");
1370 wait_event(info->wait_receive_queues,
1371 info->count_receive_queue + info->count_empty_packet_queue
1372 == info->receive_credit_max);
1373 destroy_receive_buffers(info);
1374
1375 /*
1376 * For performance reasons, memory registration and deregistration
1377 * are not locked by srv_mutex. It is possible some processes are
1378 * blocked on transport srv_mutex while holding memory registration.
1379 * Release the transport srv_mutex to allow them to hit the failure
1380 * path when sending data, and then release memory registartions.
1381 */
1382 log_rdma_event(INFO, "freeing mr list\n");
1383 wake_up_interruptible_all(&info->wait_mr);
1384 while (atomic_read(&info->mr_used_count)) {
1385 cifs_server_unlock(server);
1386 msleep(1000);
1387 cifs_server_lock(server);
1388 }
1389 destroy_mr_list(info);
1390
1391 ib_free_cq(info->send_cq);
1392 ib_free_cq(info->recv_cq);
1393 ib_dealloc_pd(info->pd);
1394 rdma_destroy_id(info->id);
1395
1396 /* free mempools */
1397 mempool_destroy(info->request_mempool);
1398 kmem_cache_destroy(info->request_cache);
1399
1400 mempool_destroy(info->response_mempool);
1401 kmem_cache_destroy(info->response_cache);
1402
1403 info->transport_status = SMBD_DESTROYED;
1404
1405 destroy_workqueue(info->workqueue);
1406 log_rdma_event(INFO, "rdma session destroyed\n");
1407 kfree(info);
1408 server->smbd_conn = NULL;
1409 }
1410
1411 /*
1412 * Reconnect this SMBD connection, called from upper layer
1413 * return value: 0 on success, or actual error code
1414 */
smbd_reconnect(struct TCP_Server_Info * server)1415 int smbd_reconnect(struct TCP_Server_Info *server)
1416 {
1417 log_rdma_event(INFO, "reconnecting rdma session\n");
1418
1419 if (!server->smbd_conn) {
1420 log_rdma_event(INFO, "rdma session already destroyed\n");
1421 goto create_conn;
1422 }
1423
1424 /*
1425 * This is possible if transport is disconnected and we haven't received
1426 * notification from RDMA, but upper layer has detected timeout
1427 */
1428 if (server->smbd_conn->transport_status == SMBD_CONNECTED) {
1429 log_rdma_event(INFO, "disconnecting transport\n");
1430 smbd_destroy(server);
1431 }
1432
1433 create_conn:
1434 log_rdma_event(INFO, "creating rdma session\n");
1435 server->smbd_conn = smbd_get_connection(
1436 server, (struct sockaddr *) &server->dstaddr);
1437
1438 if (server->smbd_conn)
1439 cifs_dbg(VFS, "RDMA transport re-established\n");
1440
1441 return server->smbd_conn ? 0 : -ENOENT;
1442 }
1443
destroy_caches_and_workqueue(struct smbd_connection * info)1444 static void destroy_caches_and_workqueue(struct smbd_connection *info)
1445 {
1446 destroy_receive_buffers(info);
1447 destroy_workqueue(info->workqueue);
1448 mempool_destroy(info->response_mempool);
1449 kmem_cache_destroy(info->response_cache);
1450 mempool_destroy(info->request_mempool);
1451 kmem_cache_destroy(info->request_cache);
1452 }
1453
1454 #define MAX_NAME_LEN 80
allocate_caches_and_workqueue(struct smbd_connection * info)1455 static int allocate_caches_and_workqueue(struct smbd_connection *info)
1456 {
1457 char name[MAX_NAME_LEN];
1458 int rc;
1459
1460 scnprintf(name, MAX_NAME_LEN, "smbd_request_%p", info);
1461 info->request_cache =
1462 kmem_cache_create(
1463 name,
1464 sizeof(struct smbd_request) +
1465 sizeof(struct smbd_data_transfer),
1466 0, SLAB_HWCACHE_ALIGN, NULL);
1467 if (!info->request_cache)
1468 return -ENOMEM;
1469
1470 info->request_mempool =
1471 mempool_create(info->send_credit_target, mempool_alloc_slab,
1472 mempool_free_slab, info->request_cache);
1473 if (!info->request_mempool)
1474 goto out1;
1475
1476 scnprintf(name, MAX_NAME_LEN, "smbd_response_%p", info);
1477 info->response_cache =
1478 kmem_cache_create(
1479 name,
1480 sizeof(struct smbd_response) +
1481 info->max_receive_size,
1482 0, SLAB_HWCACHE_ALIGN, NULL);
1483 if (!info->response_cache)
1484 goto out2;
1485
1486 info->response_mempool =
1487 mempool_create(info->receive_credit_max, mempool_alloc_slab,
1488 mempool_free_slab, info->response_cache);
1489 if (!info->response_mempool)
1490 goto out3;
1491
1492 scnprintf(name, MAX_NAME_LEN, "smbd_%p", info);
1493 info->workqueue = create_workqueue(name);
1494 if (!info->workqueue)
1495 goto out4;
1496
1497 rc = allocate_receive_buffers(info, info->receive_credit_max);
1498 if (rc) {
1499 log_rdma_event(ERR, "failed to allocate receive buffers\n");
1500 goto out5;
1501 }
1502
1503 return 0;
1504
1505 out5:
1506 destroy_workqueue(info->workqueue);
1507 out4:
1508 mempool_destroy(info->response_mempool);
1509 out3:
1510 kmem_cache_destroy(info->response_cache);
1511 out2:
1512 mempool_destroy(info->request_mempool);
1513 out1:
1514 kmem_cache_destroy(info->request_cache);
1515 return -ENOMEM;
1516 }
1517
1518 /* Create a SMBD connection, called by upper layer */
_smbd_get_connection(struct TCP_Server_Info * server,struct sockaddr * dstaddr,int port)1519 static struct smbd_connection *_smbd_get_connection(
1520 struct TCP_Server_Info *server, struct sockaddr *dstaddr, int port)
1521 {
1522 int rc;
1523 struct smbd_connection *info;
1524 struct rdma_conn_param conn_param;
1525 struct ib_qp_init_attr qp_attr;
1526 struct sockaddr_in *addr_in = (struct sockaddr_in *) dstaddr;
1527 struct ib_port_immutable port_immutable;
1528 u32 ird_ord_hdr[2];
1529
1530 info = kzalloc(sizeof(struct smbd_connection), GFP_KERNEL);
1531 if (!info)
1532 return NULL;
1533
1534 info->transport_status = SMBD_CONNECTING;
1535 rc = smbd_ia_open(info, dstaddr, port);
1536 if (rc) {
1537 log_rdma_event(INFO, "smbd_ia_open rc=%d\n", rc);
1538 goto create_id_failed;
1539 }
1540
1541 if (smbd_send_credit_target > info->id->device->attrs.max_cqe ||
1542 smbd_send_credit_target > info->id->device->attrs.max_qp_wr) {
1543 log_rdma_event(ERR, "consider lowering send_credit_target = %d. Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n",
1544 smbd_send_credit_target,
1545 info->id->device->attrs.max_cqe,
1546 info->id->device->attrs.max_qp_wr);
1547 goto config_failed;
1548 }
1549
1550 if (smbd_receive_credit_max > info->id->device->attrs.max_cqe ||
1551 smbd_receive_credit_max > info->id->device->attrs.max_qp_wr) {
1552 log_rdma_event(ERR, "consider lowering receive_credit_max = %d. Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n",
1553 smbd_receive_credit_max,
1554 info->id->device->attrs.max_cqe,
1555 info->id->device->attrs.max_qp_wr);
1556 goto config_failed;
1557 }
1558
1559 info->receive_credit_max = smbd_receive_credit_max;
1560 info->send_credit_target = smbd_send_credit_target;
1561 info->max_send_size = smbd_max_send_size;
1562 info->max_fragmented_recv_size = smbd_max_fragmented_recv_size;
1563 info->max_receive_size = smbd_max_receive_size;
1564 info->keep_alive_interval = smbd_keep_alive_interval;
1565
1566 if (info->id->device->attrs.max_send_sge < SMBDIRECT_MAX_SEND_SGE ||
1567 info->id->device->attrs.max_recv_sge < SMBDIRECT_MAX_RECV_SGE) {
1568 log_rdma_event(ERR,
1569 "device %.*s max_send_sge/max_recv_sge = %d/%d too small\n",
1570 IB_DEVICE_NAME_MAX,
1571 info->id->device->name,
1572 info->id->device->attrs.max_send_sge,
1573 info->id->device->attrs.max_recv_sge);
1574 goto config_failed;
1575 }
1576
1577 info->send_cq = NULL;
1578 info->recv_cq = NULL;
1579 info->send_cq =
1580 ib_alloc_cq_any(info->id->device, info,
1581 info->send_credit_target, IB_POLL_SOFTIRQ);
1582 if (IS_ERR(info->send_cq)) {
1583 info->send_cq = NULL;
1584 goto alloc_cq_failed;
1585 }
1586
1587 info->recv_cq =
1588 ib_alloc_cq_any(info->id->device, info,
1589 info->receive_credit_max, IB_POLL_SOFTIRQ);
1590 if (IS_ERR(info->recv_cq)) {
1591 info->recv_cq = NULL;
1592 goto alloc_cq_failed;
1593 }
1594
1595 memset(&qp_attr, 0, sizeof(qp_attr));
1596 qp_attr.event_handler = smbd_qp_async_error_upcall;
1597 qp_attr.qp_context = info;
1598 qp_attr.cap.max_send_wr = info->send_credit_target;
1599 qp_attr.cap.max_recv_wr = info->receive_credit_max;
1600 qp_attr.cap.max_send_sge = SMBDIRECT_MAX_SEND_SGE;
1601 qp_attr.cap.max_recv_sge = SMBDIRECT_MAX_RECV_SGE;
1602 qp_attr.cap.max_inline_data = 0;
1603 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
1604 qp_attr.qp_type = IB_QPT_RC;
1605 qp_attr.send_cq = info->send_cq;
1606 qp_attr.recv_cq = info->recv_cq;
1607 qp_attr.port_num = ~0;
1608
1609 rc = rdma_create_qp(info->id, info->pd, &qp_attr);
1610 if (rc) {
1611 log_rdma_event(ERR, "rdma_create_qp failed %i\n", rc);
1612 goto create_qp_failed;
1613 }
1614
1615 memset(&conn_param, 0, sizeof(conn_param));
1616 conn_param.initiator_depth = 0;
1617
1618 conn_param.responder_resources =
1619 info->id->device->attrs.max_qp_rd_atom
1620 < SMBD_CM_RESPONDER_RESOURCES ?
1621 info->id->device->attrs.max_qp_rd_atom :
1622 SMBD_CM_RESPONDER_RESOURCES;
1623 info->responder_resources = conn_param.responder_resources;
1624 log_rdma_mr(INFO, "responder_resources=%d\n",
1625 info->responder_resources);
1626
1627 /* Need to send IRD/ORD in private data for iWARP */
1628 info->id->device->ops.get_port_immutable(
1629 info->id->device, info->id->port_num, &port_immutable);
1630 if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) {
1631 ird_ord_hdr[0] = info->responder_resources;
1632 ird_ord_hdr[1] = 1;
1633 conn_param.private_data = ird_ord_hdr;
1634 conn_param.private_data_len = sizeof(ird_ord_hdr);
1635 } else {
1636 conn_param.private_data = NULL;
1637 conn_param.private_data_len = 0;
1638 }
1639
1640 conn_param.retry_count = SMBD_CM_RETRY;
1641 conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY;
1642 conn_param.flow_control = 0;
1643
1644 log_rdma_event(INFO, "connecting to IP %pI4 port %d\n",
1645 &addr_in->sin_addr, port);
1646
1647 init_waitqueue_head(&info->conn_wait);
1648 init_waitqueue_head(&info->disconn_wait);
1649 init_waitqueue_head(&info->wait_reassembly_queue);
1650 rc = rdma_connect(info->id, &conn_param);
1651 if (rc) {
1652 log_rdma_event(ERR, "rdma_connect() failed with %i\n", rc);
1653 goto rdma_connect_failed;
1654 }
1655
1656 wait_event_interruptible(
1657 info->conn_wait, info->transport_status != SMBD_CONNECTING);
1658
1659 if (info->transport_status != SMBD_CONNECTED) {
1660 log_rdma_event(ERR, "rdma_connect failed port=%d\n", port);
1661 goto rdma_connect_failed;
1662 }
1663
1664 log_rdma_event(INFO, "rdma_connect connected\n");
1665
1666 rc = allocate_caches_and_workqueue(info);
1667 if (rc) {
1668 log_rdma_event(ERR, "cache allocation failed\n");
1669 goto allocate_cache_failed;
1670 }
1671
1672 init_waitqueue_head(&info->wait_send_queue);
1673 INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer);
1674 queue_delayed_work(info->workqueue, &info->idle_timer_work,
1675 info->keep_alive_interval*HZ);
1676
1677 init_waitqueue_head(&info->wait_send_pending);
1678 atomic_set(&info->send_pending, 0);
1679
1680 init_waitqueue_head(&info->wait_post_send);
1681
1682 INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work);
1683 INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits);
1684 info->new_credits_offered = 0;
1685 spin_lock_init(&info->lock_new_credits_offered);
1686
1687 rc = smbd_negotiate(info);
1688 if (rc) {
1689 log_rdma_event(ERR, "smbd_negotiate rc=%d\n", rc);
1690 goto negotiation_failed;
1691 }
1692
1693 rc = allocate_mr_list(info);
1694 if (rc) {
1695 log_rdma_mr(ERR, "memory registration allocation failed\n");
1696 goto allocate_mr_failed;
1697 }
1698
1699 return info;
1700
1701 allocate_mr_failed:
1702 /* At this point, need to a full transport shutdown */
1703 server->smbd_conn = info;
1704 smbd_destroy(server);
1705 return NULL;
1706
1707 negotiation_failed:
1708 cancel_delayed_work_sync(&info->idle_timer_work);
1709 destroy_caches_and_workqueue(info);
1710 info->transport_status = SMBD_NEGOTIATE_FAILED;
1711 init_waitqueue_head(&info->conn_wait);
1712 rdma_disconnect(info->id);
1713 wait_event(info->conn_wait,
1714 info->transport_status == SMBD_DISCONNECTED);
1715
1716 allocate_cache_failed:
1717 rdma_connect_failed:
1718 rdma_destroy_qp(info->id);
1719
1720 create_qp_failed:
1721 alloc_cq_failed:
1722 if (info->send_cq)
1723 ib_free_cq(info->send_cq);
1724 if (info->recv_cq)
1725 ib_free_cq(info->recv_cq);
1726
1727 config_failed:
1728 ib_dealloc_pd(info->pd);
1729 rdma_destroy_id(info->id);
1730
1731 create_id_failed:
1732 kfree(info);
1733 return NULL;
1734 }
1735
smbd_get_connection(struct TCP_Server_Info * server,struct sockaddr * dstaddr)1736 struct smbd_connection *smbd_get_connection(
1737 struct TCP_Server_Info *server, struct sockaddr *dstaddr)
1738 {
1739 struct smbd_connection *ret;
1740 int port = SMBD_PORT;
1741
1742 try_again:
1743 ret = _smbd_get_connection(server, dstaddr, port);
1744
1745 /* Try SMB_PORT if SMBD_PORT doesn't work */
1746 if (!ret && port == SMBD_PORT) {
1747 port = SMB_PORT;
1748 goto try_again;
1749 }
1750 return ret;
1751 }
1752
1753 /*
1754 * Receive data from receive reassembly queue
1755 * All the incoming data packets are placed in reassembly queue
1756 * buf: the buffer to read data into
1757 * size: the length of data to read
1758 * return value: actual data read
1759 * Note: this implementation copies the data from reassebmly queue to receive
1760 * buffers used by upper layer. This is not the optimal code path. A better way
1761 * to do it is to not have upper layer allocate its receive buffers but rather
1762 * borrow the buffer from reassembly queue, and return it after data is
1763 * consumed. But this will require more changes to upper layer code, and also
1764 * need to consider packet boundaries while they still being reassembled.
1765 */
smbd_recv_buf(struct smbd_connection * info,char * buf,unsigned int size)1766 static int smbd_recv_buf(struct smbd_connection *info, char *buf,
1767 unsigned int size)
1768 {
1769 struct smbd_response *response;
1770 struct smbd_data_transfer *data_transfer;
1771 int to_copy, to_read, data_read, offset;
1772 u32 data_length, remaining_data_length, data_offset;
1773 int rc;
1774
1775 again:
1776 /*
1777 * No need to hold the reassembly queue lock all the time as we are
1778 * the only one reading from the front of the queue. The transport
1779 * may add more entries to the back of the queue at the same time
1780 */
1781 log_read(INFO, "size=%d info->reassembly_data_length=%d\n", size,
1782 info->reassembly_data_length);
1783 if (info->reassembly_data_length >= size) {
1784 int queue_length;
1785 int queue_removed = 0;
1786
1787 /*
1788 * Need to make sure reassembly_data_length is read before
1789 * reading reassembly_queue_length and calling
1790 * _get_first_reassembly. This call is lock free
1791 * as we never read at the end of the queue which are being
1792 * updated in SOFTIRQ as more data is received
1793 */
1794 virt_rmb();
1795 queue_length = info->reassembly_queue_length;
1796 data_read = 0;
1797 to_read = size;
1798 offset = info->first_entry_offset;
1799 while (data_read < size) {
1800 response = _get_first_reassembly(info);
1801 data_transfer = smbd_response_payload(response);
1802 data_length = le32_to_cpu(data_transfer->data_length);
1803 remaining_data_length =
1804 le32_to_cpu(
1805 data_transfer->remaining_data_length);
1806 data_offset = le32_to_cpu(data_transfer->data_offset);
1807
1808 /*
1809 * The upper layer expects RFC1002 length at the
1810 * beginning of the payload. Return it to indicate
1811 * the total length of the packet. This minimize the
1812 * change to upper layer packet processing logic. This
1813 * will be eventually remove when an intermediate
1814 * transport layer is added
1815 */
1816 if (response->first_segment && size == 4) {
1817 unsigned int rfc1002_len =
1818 data_length + remaining_data_length;
1819 *((__be32 *)buf) = cpu_to_be32(rfc1002_len);
1820 data_read = 4;
1821 response->first_segment = false;
1822 log_read(INFO, "returning rfc1002 length %d\n",
1823 rfc1002_len);
1824 goto read_rfc1002_done;
1825 }
1826
1827 to_copy = min_t(int, data_length - offset, to_read);
1828 memcpy(
1829 buf + data_read,
1830 (char *)data_transfer + data_offset + offset,
1831 to_copy);
1832
1833 /* move on to the next buffer? */
1834 if (to_copy == data_length - offset) {
1835 queue_length--;
1836 /*
1837 * No need to lock if we are not at the
1838 * end of the queue
1839 */
1840 if (queue_length)
1841 list_del(&response->list);
1842 else {
1843 spin_lock_irq(
1844 &info->reassembly_queue_lock);
1845 list_del(&response->list);
1846 spin_unlock_irq(
1847 &info->reassembly_queue_lock);
1848 }
1849 queue_removed++;
1850 info->count_reassembly_queue--;
1851 info->count_dequeue_reassembly_queue++;
1852 put_receive_buffer(info, response);
1853 offset = 0;
1854 log_read(INFO, "put_receive_buffer offset=0\n");
1855 } else
1856 offset += to_copy;
1857
1858 to_read -= to_copy;
1859 data_read += to_copy;
1860
1861 log_read(INFO, "_get_first_reassembly memcpy %d bytes data_transfer_length-offset=%d after that to_read=%d data_read=%d offset=%d\n",
1862 to_copy, data_length - offset,
1863 to_read, data_read, offset);
1864 }
1865
1866 spin_lock_irq(&info->reassembly_queue_lock);
1867 info->reassembly_data_length -= data_read;
1868 info->reassembly_queue_length -= queue_removed;
1869 spin_unlock_irq(&info->reassembly_queue_lock);
1870
1871 info->first_entry_offset = offset;
1872 log_read(INFO, "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n",
1873 data_read, info->reassembly_data_length,
1874 info->first_entry_offset);
1875 read_rfc1002_done:
1876 return data_read;
1877 }
1878
1879 log_read(INFO, "wait_event on more data\n");
1880 rc = wait_event_interruptible(
1881 info->wait_reassembly_queue,
1882 info->reassembly_data_length >= size ||
1883 info->transport_status != SMBD_CONNECTED);
1884 /* Don't return any data if interrupted */
1885 if (rc)
1886 return rc;
1887
1888 if (info->transport_status != SMBD_CONNECTED) {
1889 log_read(ERR, "disconnected\n");
1890 return -ECONNABORTED;
1891 }
1892
1893 goto again;
1894 }
1895
1896 /*
1897 * Receive a page from receive reassembly queue
1898 * page: the page to read data into
1899 * to_read: the length of data to read
1900 * return value: actual data read
1901 */
smbd_recv_page(struct smbd_connection * info,struct page * page,unsigned int page_offset,unsigned int to_read)1902 static int smbd_recv_page(struct smbd_connection *info,
1903 struct page *page, unsigned int page_offset,
1904 unsigned int to_read)
1905 {
1906 int ret;
1907 char *to_address;
1908 void *page_address;
1909
1910 /* make sure we have the page ready for read */
1911 ret = wait_event_interruptible(
1912 info->wait_reassembly_queue,
1913 info->reassembly_data_length >= to_read ||
1914 info->transport_status != SMBD_CONNECTED);
1915 if (ret)
1916 return ret;
1917
1918 /* now we can read from reassembly queue and not sleep */
1919 page_address = kmap_atomic(page);
1920 to_address = (char *) page_address + page_offset;
1921
1922 log_read(INFO, "reading from page=%p address=%p to_read=%d\n",
1923 page, to_address, to_read);
1924
1925 ret = smbd_recv_buf(info, to_address, to_read);
1926 kunmap_atomic(page_address);
1927
1928 return ret;
1929 }
1930
1931 /*
1932 * Receive data from transport
1933 * msg: a msghdr point to the buffer, can be ITER_KVEC or ITER_BVEC
1934 * return: total bytes read, or 0. SMB Direct will not do partial read.
1935 */
smbd_recv(struct smbd_connection * info,struct msghdr * msg)1936 int smbd_recv(struct smbd_connection *info, struct msghdr *msg)
1937 {
1938 char *buf;
1939 struct page *page;
1940 unsigned int to_read, page_offset;
1941 int rc;
1942
1943 if (iov_iter_rw(&msg->msg_iter) == WRITE) {
1944 /* It's a bug in upper layer to get there */
1945 cifs_dbg(VFS, "Invalid msg iter dir %u\n",
1946 iov_iter_rw(&msg->msg_iter));
1947 rc = -EINVAL;
1948 goto out;
1949 }
1950
1951 switch (iov_iter_type(&msg->msg_iter)) {
1952 case ITER_KVEC:
1953 buf = msg->msg_iter.kvec->iov_base;
1954 to_read = msg->msg_iter.kvec->iov_len;
1955 rc = smbd_recv_buf(info, buf, to_read);
1956 break;
1957
1958 case ITER_BVEC:
1959 page = msg->msg_iter.bvec->bv_page;
1960 page_offset = msg->msg_iter.bvec->bv_offset;
1961 to_read = msg->msg_iter.bvec->bv_len;
1962 rc = smbd_recv_page(info, page, page_offset, to_read);
1963 break;
1964
1965 default:
1966 /* It's a bug in upper layer to get there */
1967 cifs_dbg(VFS, "Invalid msg type %d\n",
1968 iov_iter_type(&msg->msg_iter));
1969 rc = -EINVAL;
1970 }
1971
1972 out:
1973 /* SMBDirect will read it all or nothing */
1974 if (rc > 0)
1975 msg->msg_iter.count = 0;
1976 return rc;
1977 }
1978
1979 /*
1980 * Send data to transport
1981 * Each rqst is transported as a SMBDirect payload
1982 * rqst: the data to write
1983 * return value: 0 if successfully write, otherwise error code
1984 */
smbd_send(struct TCP_Server_Info * server,int num_rqst,struct smb_rqst * rqst_array)1985 int smbd_send(struct TCP_Server_Info *server,
1986 int num_rqst, struct smb_rqst *rqst_array)
1987 {
1988 struct smbd_connection *info = server->smbd_conn;
1989 struct kvec vecs[SMBDIRECT_MAX_SEND_SGE - 1];
1990 int nvecs;
1991 int size;
1992 unsigned int buflen, remaining_data_length;
1993 unsigned int offset, remaining_vec_data_length;
1994 int start, i, j;
1995 int max_iov_size =
1996 info->max_send_size - sizeof(struct smbd_data_transfer);
1997 struct kvec *iov;
1998 int rc;
1999 struct smb_rqst *rqst;
2000 int rqst_idx;
2001
2002 if (info->transport_status != SMBD_CONNECTED)
2003 return -EAGAIN;
2004
2005 /*
2006 * Add in the page array if there is one. The caller needs to set
2007 * rq_tailsz to PAGE_SIZE when the buffer has multiple pages and
2008 * ends at page boundary
2009 */
2010 remaining_data_length = 0;
2011 for (i = 0; i < num_rqst; i++)
2012 remaining_data_length += smb_rqst_len(server, &rqst_array[i]);
2013
2014 if (unlikely(remaining_data_length > info->max_fragmented_send_size)) {
2015 /* assertion: payload never exceeds negotiated maximum */
2016 log_write(ERR, "payload size %d > max size %d\n",
2017 remaining_data_length, info->max_fragmented_send_size);
2018 return -EINVAL;
2019 }
2020
2021 log_write(INFO, "num_rqst=%d total length=%u\n",
2022 num_rqst, remaining_data_length);
2023
2024 rqst_idx = 0;
2025 do {
2026 rqst = &rqst_array[rqst_idx];
2027 iov = rqst->rq_iov;
2028
2029 cifs_dbg(FYI, "Sending smb (RDMA): idx=%d smb_len=%lu\n",
2030 rqst_idx, smb_rqst_len(server, rqst));
2031 remaining_vec_data_length = 0;
2032 for (i = 0; i < rqst->rq_nvec; i++) {
2033 remaining_vec_data_length += iov[i].iov_len;
2034 dump_smb(iov[i].iov_base, iov[i].iov_len);
2035 }
2036
2037 log_write(INFO, "rqst_idx=%d nvec=%d rqst->rq_npages=%d rq_pagesz=%d rq_tailsz=%d buflen=%lu\n",
2038 rqst_idx, rqst->rq_nvec,
2039 rqst->rq_npages, rqst->rq_pagesz,
2040 rqst->rq_tailsz, smb_rqst_len(server, rqst));
2041
2042 start = 0;
2043 offset = 0;
2044 do {
2045 buflen = 0;
2046 i = start;
2047 j = 0;
2048 while (i < rqst->rq_nvec &&
2049 j < SMBDIRECT_MAX_SEND_SGE - 1 &&
2050 buflen < max_iov_size) {
2051
2052 vecs[j].iov_base = iov[i].iov_base + offset;
2053 if (buflen + iov[i].iov_len > max_iov_size) {
2054 vecs[j].iov_len =
2055 max_iov_size - iov[i].iov_len;
2056 buflen = max_iov_size;
2057 offset = vecs[j].iov_len;
2058 } else {
2059 vecs[j].iov_len =
2060 iov[i].iov_len - offset;
2061 buflen += vecs[j].iov_len;
2062 offset = 0;
2063 ++i;
2064 }
2065 ++j;
2066 }
2067
2068 remaining_vec_data_length -= buflen;
2069 remaining_data_length -= buflen;
2070 log_write(INFO, "sending %s iov[%d] from start=%d nvecs=%d remaining_data_length=%d\n",
2071 remaining_vec_data_length > 0 ?
2072 "partial" : "complete",
2073 rqst->rq_nvec, start, j,
2074 remaining_data_length);
2075
2076 start = i;
2077 rc = smbd_post_send_data(info, vecs, j, remaining_data_length);
2078 if (rc)
2079 goto done;
2080 } while (remaining_vec_data_length > 0);
2081
2082 /* now sending pages if there are any */
2083 for (i = 0; i < rqst->rq_npages; i++) {
2084 rqst_page_get_length(rqst, i, &buflen, &offset);
2085 nvecs = (buflen + max_iov_size - 1) / max_iov_size;
2086 log_write(INFO, "sending pages buflen=%d nvecs=%d\n",
2087 buflen, nvecs);
2088 for (j = 0; j < nvecs; j++) {
2089 size = min_t(unsigned int, max_iov_size, remaining_data_length);
2090 remaining_data_length -= size;
2091 log_write(INFO, "sending pages i=%d offset=%d size=%d remaining_data_length=%d\n",
2092 i, j * max_iov_size + offset, size,
2093 remaining_data_length);
2094 rc = smbd_post_send_page(
2095 info, rqst->rq_pages[i],
2096 j*max_iov_size + offset,
2097 size, remaining_data_length);
2098 if (rc)
2099 goto done;
2100 }
2101 }
2102 } while (++rqst_idx < num_rqst);
2103
2104 done:
2105 /*
2106 * As an optimization, we don't wait for individual I/O to finish
2107 * before sending the next one.
2108 * Send them all and wait for pending send count to get to 0
2109 * that means all the I/Os have been out and we are good to return
2110 */
2111
2112 wait_event(info->wait_send_pending,
2113 atomic_read(&info->send_pending) == 0);
2114
2115 return rc;
2116 }
2117
register_mr_done(struct ib_cq * cq,struct ib_wc * wc)2118 static void register_mr_done(struct ib_cq *cq, struct ib_wc *wc)
2119 {
2120 struct smbd_mr *mr;
2121 struct ib_cqe *cqe;
2122
2123 if (wc->status) {
2124 log_rdma_mr(ERR, "status=%d\n", wc->status);
2125 cqe = wc->wr_cqe;
2126 mr = container_of(cqe, struct smbd_mr, cqe);
2127 smbd_disconnect_rdma_connection(mr->conn);
2128 }
2129 }
2130
2131 /*
2132 * The work queue function that recovers MRs
2133 * We need to call ib_dereg_mr() and ib_alloc_mr() before this MR can be used
2134 * again. Both calls are slow, so finish them in a workqueue. This will not
2135 * block I/O path.
2136 * There is one workqueue that recovers MRs, there is no need to lock as the
2137 * I/O requests calling smbd_register_mr will never update the links in the
2138 * mr_list.
2139 */
smbd_mr_recovery_work(struct work_struct * work)2140 static void smbd_mr_recovery_work(struct work_struct *work)
2141 {
2142 struct smbd_connection *info =
2143 container_of(work, struct smbd_connection, mr_recovery_work);
2144 struct smbd_mr *smbdirect_mr;
2145 int rc;
2146
2147 list_for_each_entry(smbdirect_mr, &info->mr_list, list) {
2148 if (smbdirect_mr->state == MR_ERROR) {
2149
2150 /* recover this MR entry */
2151 rc = ib_dereg_mr(smbdirect_mr->mr);
2152 if (rc) {
2153 log_rdma_mr(ERR,
2154 "ib_dereg_mr failed rc=%x\n",
2155 rc);
2156 smbd_disconnect_rdma_connection(info);
2157 continue;
2158 }
2159
2160 smbdirect_mr->mr = ib_alloc_mr(
2161 info->pd, info->mr_type,
2162 info->max_frmr_depth);
2163 if (IS_ERR(smbdirect_mr->mr)) {
2164 log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x max_frmr_depth=%x\n",
2165 info->mr_type,
2166 info->max_frmr_depth);
2167 smbd_disconnect_rdma_connection(info);
2168 continue;
2169 }
2170 } else
2171 /* This MR is being used, don't recover it */
2172 continue;
2173
2174 smbdirect_mr->state = MR_READY;
2175
2176 /* smbdirect_mr->state is updated by this function
2177 * and is read and updated by I/O issuing CPUs trying
2178 * to get a MR, the call to atomic_inc_return
2179 * implicates a memory barrier and guarantees this
2180 * value is updated before waking up any calls to
2181 * get_mr() from the I/O issuing CPUs
2182 */
2183 if (atomic_inc_return(&info->mr_ready_count) == 1)
2184 wake_up_interruptible(&info->wait_mr);
2185 }
2186 }
2187
destroy_mr_list(struct smbd_connection * info)2188 static void destroy_mr_list(struct smbd_connection *info)
2189 {
2190 struct smbd_mr *mr, *tmp;
2191
2192 cancel_work_sync(&info->mr_recovery_work);
2193 list_for_each_entry_safe(mr, tmp, &info->mr_list, list) {
2194 if (mr->state == MR_INVALIDATED)
2195 ib_dma_unmap_sg(info->id->device, mr->sgl,
2196 mr->sgl_count, mr->dir);
2197 ib_dereg_mr(mr->mr);
2198 kfree(mr->sgl);
2199 kfree(mr);
2200 }
2201 }
2202
2203 /*
2204 * Allocate MRs used for RDMA read/write
2205 * The number of MRs will not exceed hardware capability in responder_resources
2206 * All MRs are kept in mr_list. The MR can be recovered after it's used
2207 * Recovery is done in smbd_mr_recovery_work. The content of list entry changes
2208 * as MRs are used and recovered for I/O, but the list links will not change
2209 */
allocate_mr_list(struct smbd_connection * info)2210 static int allocate_mr_list(struct smbd_connection *info)
2211 {
2212 int i;
2213 struct smbd_mr *smbdirect_mr, *tmp;
2214
2215 INIT_LIST_HEAD(&info->mr_list);
2216 init_waitqueue_head(&info->wait_mr);
2217 spin_lock_init(&info->mr_list_lock);
2218 atomic_set(&info->mr_ready_count, 0);
2219 atomic_set(&info->mr_used_count, 0);
2220 init_waitqueue_head(&info->wait_for_mr_cleanup);
2221 INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work);
2222 /* Allocate more MRs (2x) than hardware responder_resources */
2223 for (i = 0; i < info->responder_resources * 2; i++) {
2224 smbdirect_mr = kzalloc(sizeof(*smbdirect_mr), GFP_KERNEL);
2225 if (!smbdirect_mr)
2226 goto out;
2227 smbdirect_mr->mr = ib_alloc_mr(info->pd, info->mr_type,
2228 info->max_frmr_depth);
2229 if (IS_ERR(smbdirect_mr->mr)) {
2230 log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x max_frmr_depth=%x\n",
2231 info->mr_type, info->max_frmr_depth);
2232 goto out;
2233 }
2234 smbdirect_mr->sgl = kcalloc(
2235 info->max_frmr_depth,
2236 sizeof(struct scatterlist),
2237 GFP_KERNEL);
2238 if (!smbdirect_mr->sgl) {
2239 log_rdma_mr(ERR, "failed to allocate sgl\n");
2240 ib_dereg_mr(smbdirect_mr->mr);
2241 goto out;
2242 }
2243 smbdirect_mr->state = MR_READY;
2244 smbdirect_mr->conn = info;
2245
2246 list_add_tail(&smbdirect_mr->list, &info->mr_list);
2247 atomic_inc(&info->mr_ready_count);
2248 }
2249 return 0;
2250
2251 out:
2252 kfree(smbdirect_mr);
2253
2254 list_for_each_entry_safe(smbdirect_mr, tmp, &info->mr_list, list) {
2255 list_del(&smbdirect_mr->list);
2256 ib_dereg_mr(smbdirect_mr->mr);
2257 kfree(smbdirect_mr->sgl);
2258 kfree(smbdirect_mr);
2259 }
2260 return -ENOMEM;
2261 }
2262
2263 /*
2264 * Get a MR from mr_list. This function waits until there is at least one
2265 * MR available in the list. It may access the list while the
2266 * smbd_mr_recovery_work is recovering the MR list. This doesn't need a lock
2267 * as they never modify the same places. However, there may be several CPUs
2268 * issueing I/O trying to get MR at the same time, mr_list_lock is used to
2269 * protect this situation.
2270 */
get_mr(struct smbd_connection * info)2271 static struct smbd_mr *get_mr(struct smbd_connection *info)
2272 {
2273 struct smbd_mr *ret;
2274 int rc;
2275 again:
2276 rc = wait_event_interruptible(info->wait_mr,
2277 atomic_read(&info->mr_ready_count) ||
2278 info->transport_status != SMBD_CONNECTED);
2279 if (rc) {
2280 log_rdma_mr(ERR, "wait_event_interruptible rc=%x\n", rc);
2281 return NULL;
2282 }
2283
2284 if (info->transport_status != SMBD_CONNECTED) {
2285 log_rdma_mr(ERR, "info->transport_status=%x\n",
2286 info->transport_status);
2287 return NULL;
2288 }
2289
2290 spin_lock(&info->mr_list_lock);
2291 list_for_each_entry(ret, &info->mr_list, list) {
2292 if (ret->state == MR_READY) {
2293 ret->state = MR_REGISTERED;
2294 spin_unlock(&info->mr_list_lock);
2295 atomic_dec(&info->mr_ready_count);
2296 atomic_inc(&info->mr_used_count);
2297 return ret;
2298 }
2299 }
2300
2301 spin_unlock(&info->mr_list_lock);
2302 /*
2303 * It is possible that we could fail to get MR because other processes may
2304 * try to acquire a MR at the same time. If this is the case, retry it.
2305 */
2306 goto again;
2307 }
2308
2309 /*
2310 * Register memory for RDMA read/write
2311 * pages[]: the list of pages to register memory with
2312 * num_pages: the number of pages to register
2313 * tailsz: if non-zero, the bytes to register in the last page
2314 * writing: true if this is a RDMA write (SMB read), false for RDMA read
2315 * need_invalidate: true if this MR needs to be locally invalidated after I/O
2316 * return value: the MR registered, NULL if failed.
2317 */
smbd_register_mr(struct smbd_connection * info,struct page * pages[],int num_pages,int offset,int tailsz,bool writing,bool need_invalidate)2318 struct smbd_mr *smbd_register_mr(
2319 struct smbd_connection *info, struct page *pages[], int num_pages,
2320 int offset, int tailsz, bool writing, bool need_invalidate)
2321 {
2322 struct smbd_mr *smbdirect_mr;
2323 int rc, i;
2324 enum dma_data_direction dir;
2325 struct ib_reg_wr *reg_wr;
2326
2327 if (num_pages > info->max_frmr_depth) {
2328 log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n",
2329 num_pages, info->max_frmr_depth);
2330 return NULL;
2331 }
2332
2333 smbdirect_mr = get_mr(info);
2334 if (!smbdirect_mr) {
2335 log_rdma_mr(ERR, "get_mr returning NULL\n");
2336 return NULL;
2337 }
2338 smbdirect_mr->need_invalidate = need_invalidate;
2339 smbdirect_mr->sgl_count = num_pages;
2340 sg_init_table(smbdirect_mr->sgl, num_pages);
2341
2342 log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n",
2343 num_pages, offset, tailsz);
2344
2345 if (num_pages == 1) {
2346 sg_set_page(&smbdirect_mr->sgl[0], pages[0], tailsz, offset);
2347 goto skip_multiple_pages;
2348 }
2349
2350 /* We have at least two pages to register */
2351 sg_set_page(
2352 &smbdirect_mr->sgl[0], pages[0], PAGE_SIZE - offset, offset);
2353 i = 1;
2354 while (i < num_pages - 1) {
2355 sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0);
2356 i++;
2357 }
2358 sg_set_page(&smbdirect_mr->sgl[i], pages[i],
2359 tailsz ? tailsz : PAGE_SIZE, 0);
2360
2361 skip_multiple_pages:
2362 dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2363 smbdirect_mr->dir = dir;
2364 rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir);
2365 if (!rc) {
2366 log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n",
2367 num_pages, dir, rc);
2368 goto dma_map_error;
2369 }
2370
2371 rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages,
2372 NULL, PAGE_SIZE);
2373 if (rc != num_pages) {
2374 log_rdma_mr(ERR,
2375 "ib_map_mr_sg failed rc = %d num_pages = %x\n",
2376 rc, num_pages);
2377 goto map_mr_error;
2378 }
2379
2380 ib_update_fast_reg_key(smbdirect_mr->mr,
2381 ib_inc_rkey(smbdirect_mr->mr->rkey));
2382 reg_wr = &smbdirect_mr->wr;
2383 reg_wr->wr.opcode = IB_WR_REG_MR;
2384 smbdirect_mr->cqe.done = register_mr_done;
2385 reg_wr->wr.wr_cqe = &smbdirect_mr->cqe;
2386 reg_wr->wr.num_sge = 0;
2387 reg_wr->wr.send_flags = IB_SEND_SIGNALED;
2388 reg_wr->mr = smbdirect_mr->mr;
2389 reg_wr->key = smbdirect_mr->mr->rkey;
2390 reg_wr->access = writing ?
2391 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
2392 IB_ACCESS_REMOTE_READ;
2393
2394 /*
2395 * There is no need for waiting for complemtion on ib_post_send
2396 * on IB_WR_REG_MR. Hardware enforces a barrier and order of execution
2397 * on the next ib_post_send when we actaully send I/O to remote peer
2398 */
2399 rc = ib_post_send(info->id->qp, ®_wr->wr, NULL);
2400 if (!rc)
2401 return smbdirect_mr;
2402
2403 log_rdma_mr(ERR, "ib_post_send failed rc=%x reg_wr->key=%x\n",
2404 rc, reg_wr->key);
2405
2406 /* If all failed, attempt to recover this MR by setting it MR_ERROR*/
2407 map_mr_error:
2408 ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl,
2409 smbdirect_mr->sgl_count, smbdirect_mr->dir);
2410
2411 dma_map_error:
2412 smbdirect_mr->state = MR_ERROR;
2413 if (atomic_dec_and_test(&info->mr_used_count))
2414 wake_up(&info->wait_for_mr_cleanup);
2415
2416 smbd_disconnect_rdma_connection(info);
2417
2418 return NULL;
2419 }
2420
local_inv_done(struct ib_cq * cq,struct ib_wc * wc)2421 static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc)
2422 {
2423 struct smbd_mr *smbdirect_mr;
2424 struct ib_cqe *cqe;
2425
2426 cqe = wc->wr_cqe;
2427 smbdirect_mr = container_of(cqe, struct smbd_mr, cqe);
2428 smbdirect_mr->state = MR_INVALIDATED;
2429 if (wc->status != IB_WC_SUCCESS) {
2430 log_rdma_mr(ERR, "invalidate failed status=%x\n", wc->status);
2431 smbdirect_mr->state = MR_ERROR;
2432 }
2433 complete(&smbdirect_mr->invalidate_done);
2434 }
2435
2436 /*
2437 * Deregister a MR after I/O is done
2438 * This function may wait if remote invalidation is not used
2439 * and we have to locally invalidate the buffer to prevent data is being
2440 * modified by remote peer after upper layer consumes it
2441 */
smbd_deregister_mr(struct smbd_mr * smbdirect_mr)2442 int smbd_deregister_mr(struct smbd_mr *smbdirect_mr)
2443 {
2444 struct ib_send_wr *wr;
2445 struct smbd_connection *info = smbdirect_mr->conn;
2446 int rc = 0;
2447
2448 if (smbdirect_mr->need_invalidate) {
2449 /* Need to finish local invalidation before returning */
2450 wr = &smbdirect_mr->inv_wr;
2451 wr->opcode = IB_WR_LOCAL_INV;
2452 smbdirect_mr->cqe.done = local_inv_done;
2453 wr->wr_cqe = &smbdirect_mr->cqe;
2454 wr->num_sge = 0;
2455 wr->ex.invalidate_rkey = smbdirect_mr->mr->rkey;
2456 wr->send_flags = IB_SEND_SIGNALED;
2457
2458 init_completion(&smbdirect_mr->invalidate_done);
2459 rc = ib_post_send(info->id->qp, wr, NULL);
2460 if (rc) {
2461 log_rdma_mr(ERR, "ib_post_send failed rc=%x\n", rc);
2462 smbd_disconnect_rdma_connection(info);
2463 goto done;
2464 }
2465 wait_for_completion(&smbdirect_mr->invalidate_done);
2466 smbdirect_mr->need_invalidate = false;
2467 } else
2468 /*
2469 * For remote invalidation, just set it to MR_INVALIDATED
2470 * and defer to mr_recovery_work to recover the MR for next use
2471 */
2472 smbdirect_mr->state = MR_INVALIDATED;
2473
2474 if (smbdirect_mr->state == MR_INVALIDATED) {
2475 ib_dma_unmap_sg(
2476 info->id->device, smbdirect_mr->sgl,
2477 smbdirect_mr->sgl_count,
2478 smbdirect_mr->dir);
2479 smbdirect_mr->state = MR_READY;
2480 if (atomic_inc_return(&info->mr_ready_count) == 1)
2481 wake_up_interruptible(&info->wait_mr);
2482 } else
2483 /*
2484 * Schedule the work to do MR recovery for future I/Os MR
2485 * recovery is slow and don't want it to block current I/O
2486 */
2487 queue_work(info->workqueue, &info->mr_recovery_work);
2488
2489 done:
2490 if (atomic_dec_and_test(&info->mr_used_count))
2491 wake_up(&info->wait_for_mr_cleanup);
2492
2493 return rc;
2494 }
2495