]>
Commit | Line | Data |
---|---|---|
03bee01d LL |
1 | /* |
2 | * Copyright (C) 2017, Microsoft Corporation. | |
3 | * | |
4 | * Author(s): Long Li <longli@microsoft.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
14 | * the GNU General Public License for more details. | |
15 | */ | |
f198186a | 16 | #include <linux/module.h> |
f64b78fd | 17 | #include <linux/highmem.h> |
03bee01d | 18 | #include "smbdirect.h" |
f198186a LL |
19 | #include "cifs_debug.h" |
20 | ||
21 | static struct smbd_response *get_empty_queue_buffer( | |
22 | struct smbd_connection *info); | |
23 | static struct smbd_response *get_receive_buffer( | |
24 | struct smbd_connection *info); | |
25 | static void put_receive_buffer( | |
26 | struct smbd_connection *info, | |
27 | struct smbd_response *response); | |
28 | static int allocate_receive_buffers(struct smbd_connection *info, int num_buf); | |
29 | static void destroy_receive_buffers(struct smbd_connection *info); | |
30 | ||
31 | static void put_empty_packet( | |
32 | struct smbd_connection *info, struct smbd_response *response); | |
33 | static void enqueue_reassembly( | |
34 | struct smbd_connection *info, | |
35 | struct smbd_response *response, int data_length); | |
36 | static struct smbd_response *_get_first_reassembly( | |
37 | struct smbd_connection *info); | |
38 | ||
39 | static int smbd_post_recv( | |
40 | struct smbd_connection *info, | |
41 | struct smbd_response *response); | |
42 | ||
43 | static int smbd_post_send_empty(struct smbd_connection *info); | |
d649e1bb LL |
44 | static int smbd_post_send_data( |
45 | struct smbd_connection *info, | |
46 | struct kvec *iov, int n_vec, int remaining_data_length); | |
47 | static int smbd_post_send_page(struct smbd_connection *info, | |
48 | struct page *page, unsigned long offset, | |
49 | size_t size, int remaining_data_length); | |
03bee01d | 50 | |
c7398583 LL |
51 | static void destroy_mr_list(struct smbd_connection *info); |
52 | static int allocate_mr_list(struct smbd_connection *info); | |
53 | ||
03bee01d LL |
54 | /* SMBD version number */ |
55 | #define SMBD_V1 0x0100 | |
56 | ||
57 | /* Port numbers for SMBD transport */ | |
58 | #define SMB_PORT 445 | |
59 | #define SMBD_PORT 5445 | |
60 | ||
61 | /* Address lookup and resolve timeout in ms */ | |
62 | #define RDMA_RESOLVE_TIMEOUT 5000 | |
63 | ||
64 | /* SMBD negotiation timeout in seconds */ | |
65 | #define SMBD_NEGOTIATE_TIMEOUT 120 | |
66 | ||
67 | /* SMBD minimum receive size and fragmented sized defined in [MS-SMBD] */ | |
68 | #define SMBD_MIN_RECEIVE_SIZE 128 | |
69 | #define SMBD_MIN_FRAGMENTED_SIZE 131072 | |
70 | ||
71 | /* | |
72 | * Default maximum number of RDMA read/write outstanding on this connection | |
73 | * This value is possibly decreased during QP creation on hardware limit | |
74 | */ | |
75 | #define SMBD_CM_RESPONDER_RESOURCES 32 | |
76 | ||
77 | /* Maximum number of retries on data transfer operations */ | |
78 | #define SMBD_CM_RETRY 6 | |
79 | /* No need to retry on Receiver Not Ready since SMBD manages credits */ | |
80 | #define SMBD_CM_RNR_RETRY 0 | |
81 | ||
82 | /* | |
83 | * User configurable initial values per SMBD transport connection | |
84 | * as defined in [MS-SMBD] 3.1.1.1 | |
85 | * Those may change after a SMBD negotiation | |
86 | */ | |
87 | /* The local peer's maximum number of credits to grant to the peer */ | |
88 | int smbd_receive_credit_max = 255; | |
89 | ||
90 | /* The remote peer's credit request of local peer */ | |
91 | int smbd_send_credit_target = 255; | |
92 | ||
93 | /* The maximum single message size can be sent to remote peer */ | |
94 | int smbd_max_send_size = 1364; | |
95 | ||
96 | /* The maximum fragmented upper-layer payload receive size supported */ | |
97 | int smbd_max_fragmented_recv_size = 1024 * 1024; | |
98 | ||
99 | /* The maximum single-message size which can be received */ | |
100 | int smbd_max_receive_size = 8192; | |
101 | ||
102 | /* The timeout to initiate send of a keepalive message on idle */ | |
103 | int smbd_keep_alive_interval = 120; | |
104 | ||
105 | /* | |
106 | * User configurable initial values for RDMA transport | |
107 | * The actual values used may be lower and are limited to hardware capabilities | |
108 | */ | |
109 | /* Default maximum number of SGEs in a RDMA write/read */ | |
110 | int smbd_max_frmr_depth = 2048; | |
111 | ||
112 | /* If payload is less than this byte, use RDMA send/recv not read/write */ | |
113 | int rdma_readwrite_threshold = 4096; | |
f198186a LL |
114 | |
115 | /* Transport logging functions | |
116 | * Logging are defined as classes. They can be OR'ed to define the actual | |
117 | * logging level via module parameter smbd_logging_class | |
118 | * e.g. cifs.smbd_logging_class=0xa0 will log all log_rdma_recv() and | |
119 | * log_rdma_event() | |
120 | */ | |
121 | #define LOG_OUTGOING 0x1 | |
122 | #define LOG_INCOMING 0x2 | |
123 | #define LOG_READ 0x4 | |
124 | #define LOG_WRITE 0x8 | |
125 | #define LOG_RDMA_SEND 0x10 | |
126 | #define LOG_RDMA_RECV 0x20 | |
127 | #define LOG_KEEP_ALIVE 0x40 | |
128 | #define LOG_RDMA_EVENT 0x80 | |
129 | #define LOG_RDMA_MR 0x100 | |
130 | static unsigned int smbd_logging_class; | |
131 | module_param(smbd_logging_class, uint, 0644); | |
132 | MODULE_PARM_DESC(smbd_logging_class, | |
133 | "Logging class for SMBD transport 0x0 to 0x100"); | |
134 | ||
135 | #define ERR 0x0 | |
136 | #define INFO 0x1 | |
137 | static unsigned int smbd_logging_level = ERR; | |
138 | module_param(smbd_logging_level, uint, 0644); | |
139 | MODULE_PARM_DESC(smbd_logging_level, | |
140 | "Logging level for SMBD transport, 0 (default): error, 1: info"); | |
141 | ||
142 | #define log_rdma(level, class, fmt, args...) \ | |
143 | do { \ | |
144 | if (level <= smbd_logging_level || class & smbd_logging_class) \ | |
145 | cifs_dbg(VFS, "%s:%d " fmt, __func__, __LINE__, ##args);\ | |
146 | } while (0) | |
147 | ||
148 | #define log_outgoing(level, fmt, args...) \ | |
149 | log_rdma(level, LOG_OUTGOING, fmt, ##args) | |
150 | #define log_incoming(level, fmt, args...) \ | |
151 | log_rdma(level, LOG_INCOMING, fmt, ##args) | |
152 | #define log_read(level, fmt, args...) log_rdma(level, LOG_READ, fmt, ##args) | |
153 | #define log_write(level, fmt, args...) log_rdma(level, LOG_WRITE, fmt, ##args) | |
154 | #define log_rdma_send(level, fmt, args...) \ | |
155 | log_rdma(level, LOG_RDMA_SEND, fmt, ##args) | |
156 | #define log_rdma_recv(level, fmt, args...) \ | |
157 | log_rdma(level, LOG_RDMA_RECV, fmt, ##args) | |
158 | #define log_keep_alive(level, fmt, args...) \ | |
159 | log_rdma(level, LOG_KEEP_ALIVE, fmt, ##args) | |
160 | #define log_rdma_event(level, fmt, args...) \ | |
161 | log_rdma(level, LOG_RDMA_EVENT, fmt, ##args) | |
162 | #define log_rdma_mr(level, fmt, args...) \ | |
163 | log_rdma(level, LOG_RDMA_MR, fmt, ##args) | |
164 | ||
165 | /* | |
166 | * Destroy the transport and related RDMA and memory resources | |
167 | * Need to go through all the pending counters and make sure on one is using | |
168 | * the transport while it is destroyed | |
169 | */ | |
170 | static void smbd_destroy_rdma_work(struct work_struct *work) | |
171 | { | |
172 | struct smbd_response *response; | |
173 | struct smbd_connection *info = | |
174 | container_of(work, struct smbd_connection, destroy_work); | |
175 | unsigned long flags; | |
176 | ||
177 | log_rdma_event(INFO, "destroying qp\n"); | |
178 | ib_drain_qp(info->id->qp); | |
179 | rdma_destroy_qp(info->id); | |
180 | ||
181 | /* Unblock all I/O waiting on the send queue */ | |
182 | wake_up_interruptible_all(&info->wait_send_queue); | |
183 | ||
184 | log_rdma_event(INFO, "cancelling idle timer\n"); | |
185 | cancel_delayed_work_sync(&info->idle_timer_work); | |
186 | log_rdma_event(INFO, "cancelling send immediate work\n"); | |
187 | cancel_delayed_work_sync(&info->send_immediate_work); | |
188 | ||
d649e1bb LL |
189 | log_rdma_event(INFO, "wait for all send to finish\n"); |
190 | wait_event(info->wait_smbd_send_pending, | |
191 | info->smbd_send_pending == 0); | |
192 | ||
f198186a LL |
193 | log_rdma_event(INFO, "wait for all recv to finish\n"); |
194 | wake_up_interruptible(&info->wait_reassembly_queue); | |
f64b78fd LL |
195 | wait_event(info->wait_smbd_recv_pending, |
196 | info->smbd_recv_pending == 0); | |
f198186a LL |
197 | |
198 | log_rdma_event(INFO, "wait for all send posted to IB to finish\n"); | |
199 | wait_event(info->wait_send_pending, | |
200 | atomic_read(&info->send_pending) == 0); | |
201 | wait_event(info->wait_send_payload_pending, | |
202 | atomic_read(&info->send_payload_pending) == 0); | |
203 | ||
c7398583 LL |
204 | log_rdma_event(INFO, "freeing mr list\n"); |
205 | wake_up_interruptible_all(&info->wait_mr); | |
206 | wait_event(info->wait_for_mr_cleanup, | |
207 | atomic_read(&info->mr_used_count) == 0); | |
208 | destroy_mr_list(info); | |
209 | ||
f198186a LL |
210 | /* It's not posssible for upper layer to get to reassembly */ |
211 | log_rdma_event(INFO, "drain the reassembly queue\n"); | |
212 | do { | |
213 | spin_lock_irqsave(&info->reassembly_queue_lock, flags); | |
214 | response = _get_first_reassembly(info); | |
215 | if (response) { | |
216 | list_del(&response->list); | |
217 | spin_unlock_irqrestore( | |
218 | &info->reassembly_queue_lock, flags); | |
219 | put_receive_buffer(info, response); | |
f9de151b SF |
220 | } else |
221 | spin_unlock_irqrestore(&info->reassembly_queue_lock, flags); | |
f198186a | 222 | } while (response); |
f9de151b | 223 | |
f198186a LL |
224 | info->reassembly_data_length = 0; |
225 | ||
226 | log_rdma_event(INFO, "free receive buffers\n"); | |
227 | wait_event(info->wait_receive_queues, | |
228 | info->count_receive_queue + info->count_empty_packet_queue | |
229 | == info->receive_credit_max); | |
230 | destroy_receive_buffers(info); | |
231 | ||
232 | ib_free_cq(info->send_cq); | |
233 | ib_free_cq(info->recv_cq); | |
234 | ib_dealloc_pd(info->pd); | |
235 | rdma_destroy_id(info->id); | |
236 | ||
237 | /* free mempools */ | |
238 | mempool_destroy(info->request_mempool); | |
239 | kmem_cache_destroy(info->request_cache); | |
240 | ||
241 | mempool_destroy(info->response_mempool); | |
242 | kmem_cache_destroy(info->response_cache); | |
243 | ||
244 | info->transport_status = SMBD_DESTROYED; | |
245 | wake_up_all(&info->wait_destroy); | |
246 | } | |
247 | ||
248 | static int smbd_process_disconnected(struct smbd_connection *info) | |
249 | { | |
250 | schedule_work(&info->destroy_work); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static void smbd_disconnect_rdma_work(struct work_struct *work) | |
255 | { | |
256 | struct smbd_connection *info = | |
257 | container_of(work, struct smbd_connection, disconnect_work); | |
258 | ||
259 | if (info->transport_status == SMBD_CONNECTED) { | |
260 | info->transport_status = SMBD_DISCONNECTING; | |
261 | rdma_disconnect(info->id); | |
262 | } | |
263 | } | |
264 | ||
265 | static void smbd_disconnect_rdma_connection(struct smbd_connection *info) | |
266 | { | |
267 | queue_work(info->workqueue, &info->disconnect_work); | |
268 | } | |
269 | ||
270 | /* Upcall from RDMA CM */ | |
271 | static int smbd_conn_upcall( | |
272 | struct rdma_cm_id *id, struct rdma_cm_event *event) | |
273 | { | |
274 | struct smbd_connection *info = id->context; | |
275 | ||
276 | log_rdma_event(INFO, "event=%d status=%d\n", | |
277 | event->event, event->status); | |
278 | ||
279 | switch (event->event) { | |
280 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
281 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
282 | info->ri_rc = 0; | |
283 | complete(&info->ri_done); | |
284 | break; | |
285 | ||
286 | case RDMA_CM_EVENT_ADDR_ERROR: | |
287 | info->ri_rc = -EHOSTUNREACH; | |
288 | complete(&info->ri_done); | |
289 | break; | |
290 | ||
291 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
292 | info->ri_rc = -ENETUNREACH; | |
293 | complete(&info->ri_done); | |
294 | break; | |
295 | ||
296 | case RDMA_CM_EVENT_ESTABLISHED: | |
297 | log_rdma_event(INFO, "connected event=%d\n", event->event); | |
298 | info->transport_status = SMBD_CONNECTED; | |
299 | wake_up_interruptible(&info->conn_wait); | |
300 | break; | |
301 | ||
302 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
303 | case RDMA_CM_EVENT_UNREACHABLE: | |
304 | case RDMA_CM_EVENT_REJECTED: | |
305 | log_rdma_event(INFO, "connecting failed event=%d\n", event->event); | |
306 | info->transport_status = SMBD_DISCONNECTED; | |
307 | wake_up_interruptible(&info->conn_wait); | |
308 | break; | |
309 | ||
310 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
311 | case RDMA_CM_EVENT_DISCONNECTED: | |
312 | /* This happenes when we fail the negotiation */ | |
313 | if (info->transport_status == SMBD_NEGOTIATE_FAILED) { | |
314 | info->transport_status = SMBD_DISCONNECTED; | |
315 | wake_up(&info->conn_wait); | |
316 | break; | |
317 | } | |
318 | ||
319 | info->transport_status = SMBD_DISCONNECTED; | |
320 | smbd_process_disconnected(info); | |
321 | break; | |
322 | ||
323 | default: | |
324 | break; | |
325 | } | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
330 | /* Upcall from RDMA QP */ | |
331 | static void | |
332 | smbd_qp_async_error_upcall(struct ib_event *event, void *context) | |
333 | { | |
334 | struct smbd_connection *info = context; | |
335 | ||
336 | log_rdma_event(ERR, "%s on device %s info %p\n", | |
337 | ib_event_msg(event->event), event->device->name, info); | |
338 | ||
339 | switch (event->event) { | |
340 | case IB_EVENT_CQ_ERR: | |
341 | case IB_EVENT_QP_FATAL: | |
342 | smbd_disconnect_rdma_connection(info); | |
343 | ||
344 | default: | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | static inline void *smbd_request_payload(struct smbd_request *request) | |
350 | { | |
351 | return (void *)request->packet; | |
352 | } | |
353 | ||
354 | static inline void *smbd_response_payload(struct smbd_response *response) | |
355 | { | |
356 | return (void *)response->packet; | |
357 | } | |
358 | ||
359 | /* Called when a RDMA send is done */ | |
360 | static void send_done(struct ib_cq *cq, struct ib_wc *wc) | |
361 | { | |
362 | int i; | |
363 | struct smbd_request *request = | |
364 | container_of(wc->wr_cqe, struct smbd_request, cqe); | |
365 | ||
366 | log_rdma_send(INFO, "smbd_request %p completed wc->status=%d\n", | |
367 | request, wc->status); | |
368 | ||
369 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { | |
370 | log_rdma_send(ERR, "wc->status=%d wc->opcode=%d\n", | |
371 | wc->status, wc->opcode); | |
372 | smbd_disconnect_rdma_connection(request->info); | |
373 | } | |
374 | ||
375 | for (i = 0; i < request->num_sge; i++) | |
376 | ib_dma_unmap_single(request->info->id->device, | |
377 | request->sge[i].addr, | |
378 | request->sge[i].length, | |
379 | DMA_TO_DEVICE); | |
380 | ||
381 | if (request->has_payload) { | |
382 | if (atomic_dec_and_test(&request->info->send_payload_pending)) | |
383 | wake_up(&request->info->wait_send_payload_pending); | |
384 | } else { | |
385 | if (atomic_dec_and_test(&request->info->send_pending)) | |
386 | wake_up(&request->info->wait_send_pending); | |
387 | } | |
388 | ||
389 | mempool_free(request, request->info->request_mempool); | |
390 | } | |
391 | ||
392 | static void dump_smbd_negotiate_resp(struct smbd_negotiate_resp *resp) | |
393 | { | |
394 | log_rdma_event(INFO, "resp message min_version %u max_version %u " | |
395 | "negotiated_version %u credits_requested %u " | |
396 | "credits_granted %u status %u max_readwrite_size %u " | |
397 | "preferred_send_size %u max_receive_size %u " | |
398 | "max_fragmented_size %u\n", | |
399 | resp->min_version, resp->max_version, resp->negotiated_version, | |
400 | resp->credits_requested, resp->credits_granted, resp->status, | |
401 | resp->max_readwrite_size, resp->preferred_send_size, | |
402 | resp->max_receive_size, resp->max_fragmented_size); | |
403 | } | |
404 | ||
405 | /* | |
406 | * Process a negotiation response message, according to [MS-SMBD]3.1.5.7 | |
407 | * response, packet_length: the negotiation response message | |
408 | * return value: true if negotiation is a success, false if failed | |
409 | */ | |
410 | static bool process_negotiation_response( | |
411 | struct smbd_response *response, int packet_length) | |
412 | { | |
413 | struct smbd_connection *info = response->info; | |
414 | struct smbd_negotiate_resp *packet = smbd_response_payload(response); | |
415 | ||
416 | if (packet_length < sizeof(struct smbd_negotiate_resp)) { | |
417 | log_rdma_event(ERR, | |
418 | "error: packet_length=%d\n", packet_length); | |
419 | return false; | |
420 | } | |
421 | ||
422 | if (le16_to_cpu(packet->negotiated_version) != SMBD_V1) { | |
423 | log_rdma_event(ERR, "error: negotiated_version=%x\n", | |
424 | le16_to_cpu(packet->negotiated_version)); | |
425 | return false; | |
426 | } | |
427 | info->protocol = le16_to_cpu(packet->negotiated_version); | |
428 | ||
429 | if (packet->credits_requested == 0) { | |
430 | log_rdma_event(ERR, "error: credits_requested==0\n"); | |
431 | return false; | |
432 | } | |
433 | info->receive_credit_target = le16_to_cpu(packet->credits_requested); | |
434 | ||
435 | if (packet->credits_granted == 0) { | |
436 | log_rdma_event(ERR, "error: credits_granted==0\n"); | |
437 | return false; | |
438 | } | |
439 | atomic_set(&info->send_credits, le16_to_cpu(packet->credits_granted)); | |
440 | ||
441 | atomic_set(&info->receive_credits, 0); | |
442 | ||
443 | if (le32_to_cpu(packet->preferred_send_size) > info->max_receive_size) { | |
444 | log_rdma_event(ERR, "error: preferred_send_size=%d\n", | |
445 | le32_to_cpu(packet->preferred_send_size)); | |
446 | return false; | |
447 | } | |
448 | info->max_receive_size = le32_to_cpu(packet->preferred_send_size); | |
449 | ||
450 | if (le32_to_cpu(packet->max_receive_size) < SMBD_MIN_RECEIVE_SIZE) { | |
451 | log_rdma_event(ERR, "error: max_receive_size=%d\n", | |
452 | le32_to_cpu(packet->max_receive_size)); | |
453 | return false; | |
454 | } | |
455 | info->max_send_size = min_t(int, info->max_send_size, | |
456 | le32_to_cpu(packet->max_receive_size)); | |
457 | ||
458 | if (le32_to_cpu(packet->max_fragmented_size) < | |
459 | SMBD_MIN_FRAGMENTED_SIZE) { | |
460 | log_rdma_event(ERR, "error: max_fragmented_size=%d\n", | |
461 | le32_to_cpu(packet->max_fragmented_size)); | |
462 | return false; | |
463 | } | |
464 | info->max_fragmented_send_size = | |
465 | le32_to_cpu(packet->max_fragmented_size); | |
c7398583 LL |
466 | info->rdma_readwrite_threshold = |
467 | rdma_readwrite_threshold > info->max_fragmented_send_size ? | |
468 | info->max_fragmented_send_size : | |
469 | rdma_readwrite_threshold; | |
470 | ||
471 | ||
472 | info->max_readwrite_size = min_t(u32, | |
473 | le32_to_cpu(packet->max_readwrite_size), | |
474 | info->max_frmr_depth * PAGE_SIZE); | |
475 | info->max_frmr_depth = info->max_readwrite_size / PAGE_SIZE; | |
f198186a LL |
476 | |
477 | return true; | |
478 | } | |
479 | ||
480 | /* | |
481 | * Check and schedule to send an immediate packet | |
482 | * This is used to extend credtis to remote peer to keep the transport busy | |
483 | */ | |
484 | static void check_and_send_immediate(struct smbd_connection *info) | |
485 | { | |
486 | if (info->transport_status != SMBD_CONNECTED) | |
487 | return; | |
488 | ||
489 | info->send_immediate = true; | |
490 | ||
491 | /* | |
492 | * Promptly send a packet if our peer is running low on receive | |
493 | * credits | |
494 | */ | |
495 | if (atomic_read(&info->receive_credits) < | |
496 | info->receive_credit_target - 1) | |
497 | queue_delayed_work( | |
498 | info->workqueue, &info->send_immediate_work, 0); | |
499 | } | |
500 | ||
501 | static void smbd_post_send_credits(struct work_struct *work) | |
502 | { | |
503 | int ret = 0; | |
504 | int use_receive_queue = 1; | |
505 | int rc; | |
506 | struct smbd_response *response; | |
507 | struct smbd_connection *info = | |
508 | container_of(work, struct smbd_connection, | |
509 | post_send_credits_work); | |
510 | ||
511 | if (info->transport_status != SMBD_CONNECTED) { | |
512 | wake_up(&info->wait_receive_queues); | |
513 | return; | |
514 | } | |
515 | ||
516 | if (info->receive_credit_target > | |
517 | atomic_read(&info->receive_credits)) { | |
518 | while (true) { | |
519 | if (use_receive_queue) | |
520 | response = get_receive_buffer(info); | |
521 | else | |
522 | response = get_empty_queue_buffer(info); | |
523 | if (!response) { | |
524 | /* now switch to emtpy packet queue */ | |
525 | if (use_receive_queue) { | |
526 | use_receive_queue = 0; | |
527 | continue; | |
528 | } else | |
529 | break; | |
530 | } | |
531 | ||
532 | response->type = SMBD_TRANSFER_DATA; | |
533 | response->first_segment = false; | |
534 | rc = smbd_post_recv(info, response); | |
535 | if (rc) { | |
536 | log_rdma_recv(ERR, | |
537 | "post_recv failed rc=%d\n", rc); | |
538 | put_receive_buffer(info, response); | |
539 | break; | |
540 | } | |
541 | ||
542 | ret++; | |
543 | } | |
544 | } | |
545 | ||
546 | spin_lock(&info->lock_new_credits_offered); | |
547 | info->new_credits_offered += ret; | |
548 | spin_unlock(&info->lock_new_credits_offered); | |
549 | ||
550 | atomic_add(ret, &info->receive_credits); | |
551 | ||
552 | /* Check if we can post new receive and grant credits to peer */ | |
553 | check_and_send_immediate(info); | |
554 | } | |
555 | ||
556 | static void smbd_recv_done_work(struct work_struct *work) | |
557 | { | |
558 | struct smbd_connection *info = | |
559 | container_of(work, struct smbd_connection, recv_done_work); | |
560 | ||
561 | /* | |
562 | * We may have new send credits granted from remote peer | |
563 | * If any sender is blcoked on lack of credets, unblock it | |
564 | */ | |
565 | if (atomic_read(&info->send_credits)) | |
566 | wake_up_interruptible(&info->wait_send_queue); | |
567 | ||
568 | /* | |
569 | * Check if we need to send something to remote peer to | |
570 | * grant more credits or respond to KEEP_ALIVE packet | |
571 | */ | |
572 | check_and_send_immediate(info); | |
573 | } | |
574 | ||
575 | /* Called from softirq, when recv is done */ | |
576 | static void recv_done(struct ib_cq *cq, struct ib_wc *wc) | |
577 | { | |
578 | struct smbd_data_transfer *data_transfer; | |
579 | struct smbd_response *response = | |
580 | container_of(wc->wr_cqe, struct smbd_response, cqe); | |
581 | struct smbd_connection *info = response->info; | |
582 | int data_length = 0; | |
583 | ||
584 | log_rdma_recv(INFO, "response=%p type=%d wc status=%d wc opcode %d " | |
585 | "byte_len=%d pkey_index=%x\n", | |
586 | response, response->type, wc->status, wc->opcode, | |
587 | wc->byte_len, wc->pkey_index); | |
588 | ||
589 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { | |
590 | log_rdma_recv(INFO, "wc->status=%d opcode=%d\n", | |
591 | wc->status, wc->opcode); | |
592 | smbd_disconnect_rdma_connection(info); | |
593 | goto error; | |
594 | } | |
595 | ||
596 | ib_dma_sync_single_for_cpu( | |
597 | wc->qp->device, | |
598 | response->sge.addr, | |
599 | response->sge.length, | |
600 | DMA_FROM_DEVICE); | |
601 | ||
602 | switch (response->type) { | |
603 | /* SMBD negotiation response */ | |
604 | case SMBD_NEGOTIATE_RESP: | |
605 | dump_smbd_negotiate_resp(smbd_response_payload(response)); | |
606 | info->full_packet_received = true; | |
607 | info->negotiate_done = | |
608 | process_negotiation_response(response, wc->byte_len); | |
609 | complete(&info->negotiate_completion); | |
610 | break; | |
611 | ||
612 | /* SMBD data transfer packet */ | |
613 | case SMBD_TRANSFER_DATA: | |
614 | data_transfer = smbd_response_payload(response); | |
615 | data_length = le32_to_cpu(data_transfer->data_length); | |
616 | ||
617 | /* | |
618 | * If this is a packet with data playload place the data in | |
619 | * reassembly queue and wake up the reading thread | |
620 | */ | |
621 | if (data_length) { | |
622 | if (info->full_packet_received) | |
623 | response->first_segment = true; | |
624 | ||
625 | if (le32_to_cpu(data_transfer->remaining_data_length)) | |
626 | info->full_packet_received = false; | |
627 | else | |
628 | info->full_packet_received = true; | |
629 | ||
630 | enqueue_reassembly( | |
631 | info, | |
632 | response, | |
633 | data_length); | |
634 | } else | |
635 | put_empty_packet(info, response); | |
636 | ||
637 | if (data_length) | |
638 | wake_up_interruptible(&info->wait_reassembly_queue); | |
639 | ||
640 | atomic_dec(&info->receive_credits); | |
641 | info->receive_credit_target = | |
642 | le16_to_cpu(data_transfer->credits_requested); | |
643 | atomic_add(le16_to_cpu(data_transfer->credits_granted), | |
644 | &info->send_credits); | |
645 | ||
646 | log_incoming(INFO, "data flags %d data_offset %d " | |
647 | "data_length %d remaining_data_length %d\n", | |
648 | le16_to_cpu(data_transfer->flags), | |
649 | le32_to_cpu(data_transfer->data_offset), | |
650 | le32_to_cpu(data_transfer->data_length), | |
651 | le32_to_cpu(data_transfer->remaining_data_length)); | |
652 | ||
653 | /* Send a KEEP_ALIVE response right away if requested */ | |
654 | info->keep_alive_requested = KEEP_ALIVE_NONE; | |
655 | if (le16_to_cpu(data_transfer->flags) & | |
656 | SMB_DIRECT_RESPONSE_REQUESTED) { | |
657 | info->keep_alive_requested = KEEP_ALIVE_PENDING; | |
658 | } | |
659 | ||
660 | queue_work(info->workqueue, &info->recv_done_work); | |
661 | return; | |
662 | ||
663 | default: | |
664 | log_rdma_recv(ERR, | |
665 | "unexpected response type=%d\n", response->type); | |
666 | } | |
667 | ||
668 | error: | |
669 | put_receive_buffer(info, response); | |
670 | } | |
671 | ||
672 | static struct rdma_cm_id *smbd_create_id( | |
673 | struct smbd_connection *info, | |
674 | struct sockaddr *dstaddr, int port) | |
675 | { | |
676 | struct rdma_cm_id *id; | |
677 | int rc; | |
678 | __be16 *sport; | |
679 | ||
680 | id = rdma_create_id(&init_net, smbd_conn_upcall, info, | |
681 | RDMA_PS_TCP, IB_QPT_RC); | |
682 | if (IS_ERR(id)) { | |
683 | rc = PTR_ERR(id); | |
684 | log_rdma_event(ERR, "rdma_create_id() failed %i\n", rc); | |
685 | return id; | |
686 | } | |
687 | ||
688 | if (dstaddr->sa_family == AF_INET6) | |
689 | sport = &((struct sockaddr_in6 *)dstaddr)->sin6_port; | |
690 | else | |
691 | sport = &((struct sockaddr_in *)dstaddr)->sin_port; | |
692 | ||
693 | *sport = htons(port); | |
694 | ||
695 | init_completion(&info->ri_done); | |
696 | info->ri_rc = -ETIMEDOUT; | |
697 | ||
698 | rc = rdma_resolve_addr(id, NULL, (struct sockaddr *)dstaddr, | |
699 | RDMA_RESOLVE_TIMEOUT); | |
700 | if (rc) { | |
701 | log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc); | |
702 | goto out; | |
703 | } | |
704 | wait_for_completion_interruptible_timeout( | |
705 | &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); | |
706 | rc = info->ri_rc; | |
707 | if (rc) { | |
708 | log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc); | |
709 | goto out; | |
710 | } | |
711 | ||
712 | info->ri_rc = -ETIMEDOUT; | |
713 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); | |
714 | if (rc) { | |
715 | log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc); | |
716 | goto out; | |
717 | } | |
718 | wait_for_completion_interruptible_timeout( | |
719 | &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT)); | |
720 | rc = info->ri_rc; | |
721 | if (rc) { | |
722 | log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc); | |
723 | goto out; | |
724 | } | |
725 | ||
726 | return id; | |
727 | ||
728 | out: | |
729 | rdma_destroy_id(id); | |
730 | return ERR_PTR(rc); | |
731 | } | |
732 | ||
733 | /* | |
734 | * Test if FRWR (Fast Registration Work Requests) is supported on the device | |
735 | * This implementation requries FRWR on RDMA read/write | |
736 | * return value: true if it is supported | |
737 | */ | |
738 | static bool frwr_is_supported(struct ib_device_attr *attrs) | |
739 | { | |
740 | if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) | |
741 | return false; | |
742 | if (attrs->max_fast_reg_page_list_len == 0) | |
743 | return false; | |
744 | return true; | |
745 | } | |
746 | ||
747 | static int smbd_ia_open( | |
748 | struct smbd_connection *info, | |
749 | struct sockaddr *dstaddr, int port) | |
750 | { | |
751 | int rc; | |
752 | ||
753 | info->id = smbd_create_id(info, dstaddr, port); | |
754 | if (IS_ERR(info->id)) { | |
755 | rc = PTR_ERR(info->id); | |
756 | goto out1; | |
757 | } | |
758 | ||
759 | if (!frwr_is_supported(&info->id->device->attrs)) { | |
760 | log_rdma_event(ERR, | |
761 | "Fast Registration Work Requests " | |
762 | "(FRWR) is not supported\n"); | |
763 | log_rdma_event(ERR, | |
764 | "Device capability flags = %llx " | |
765 | "max_fast_reg_page_list_len = %u\n", | |
766 | info->id->device->attrs.device_cap_flags, | |
767 | info->id->device->attrs.max_fast_reg_page_list_len); | |
768 | rc = -EPROTONOSUPPORT; | |
769 | goto out2; | |
770 | } | |
c7398583 LL |
771 | info->max_frmr_depth = min_t(int, |
772 | smbd_max_frmr_depth, | |
773 | info->id->device->attrs.max_fast_reg_page_list_len); | |
774 | info->mr_type = IB_MR_TYPE_MEM_REG; | |
775 | if (info->id->device->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) | |
776 | info->mr_type = IB_MR_TYPE_SG_GAPS; | |
f198186a LL |
777 | |
778 | info->pd = ib_alloc_pd(info->id->device, 0); | |
779 | if (IS_ERR(info->pd)) { | |
780 | rc = PTR_ERR(info->pd); | |
781 | log_rdma_event(ERR, "ib_alloc_pd() returned %d\n", rc); | |
782 | goto out2; | |
783 | } | |
784 | ||
785 | return 0; | |
786 | ||
787 | out2: | |
788 | rdma_destroy_id(info->id); | |
789 | info->id = NULL; | |
790 | ||
791 | out1: | |
792 | return rc; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Send a negotiation request message to the peer | |
797 | * The negotiation procedure is in [MS-SMBD] 3.1.5.2 and 3.1.5.3 | |
798 | * After negotiation, the transport is connected and ready for | |
799 | * carrying upper layer SMB payload | |
800 | */ | |
801 | static int smbd_post_send_negotiate_req(struct smbd_connection *info) | |
802 | { | |
803 | struct ib_send_wr send_wr, *send_wr_fail; | |
804 | int rc = -ENOMEM; | |
805 | struct smbd_request *request; | |
806 | struct smbd_negotiate_req *packet; | |
807 | ||
808 | request = mempool_alloc(info->request_mempool, GFP_KERNEL); | |
809 | if (!request) | |
810 | return rc; | |
811 | ||
812 | request->info = info; | |
813 | ||
814 | packet = smbd_request_payload(request); | |
815 | packet->min_version = cpu_to_le16(SMBD_V1); | |
816 | packet->max_version = cpu_to_le16(SMBD_V1); | |
817 | packet->reserved = 0; | |
818 | packet->credits_requested = cpu_to_le16(info->send_credit_target); | |
819 | packet->preferred_send_size = cpu_to_le32(info->max_send_size); | |
820 | packet->max_receive_size = cpu_to_le32(info->max_receive_size); | |
821 | packet->max_fragmented_size = | |
822 | cpu_to_le32(info->max_fragmented_recv_size); | |
823 | ||
824 | request->num_sge = 1; | |
825 | request->sge[0].addr = ib_dma_map_single( | |
826 | info->id->device, (void *)packet, | |
827 | sizeof(*packet), DMA_TO_DEVICE); | |
828 | if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { | |
829 | rc = -EIO; | |
830 | goto dma_mapping_failed; | |
831 | } | |
832 | ||
833 | request->sge[0].length = sizeof(*packet); | |
834 | request->sge[0].lkey = info->pd->local_dma_lkey; | |
835 | ||
836 | ib_dma_sync_single_for_device( | |
837 | info->id->device, request->sge[0].addr, | |
838 | request->sge[0].length, DMA_TO_DEVICE); | |
839 | ||
840 | request->cqe.done = send_done; | |
841 | ||
842 | send_wr.next = NULL; | |
843 | send_wr.wr_cqe = &request->cqe; | |
844 | send_wr.sg_list = request->sge; | |
845 | send_wr.num_sge = request->num_sge; | |
846 | send_wr.opcode = IB_WR_SEND; | |
847 | send_wr.send_flags = IB_SEND_SIGNALED; | |
848 | ||
849 | log_rdma_send(INFO, "sge addr=%llx length=%x lkey=%x\n", | |
850 | request->sge[0].addr, | |
851 | request->sge[0].length, request->sge[0].lkey); | |
852 | ||
853 | request->has_payload = false; | |
854 | atomic_inc(&info->send_pending); | |
855 | rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail); | |
856 | if (!rc) | |
857 | return 0; | |
858 | ||
859 | /* if we reach here, post send failed */ | |
860 | log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); | |
861 | atomic_dec(&info->send_pending); | |
862 | ib_dma_unmap_single(info->id->device, request->sge[0].addr, | |
863 | request->sge[0].length, DMA_TO_DEVICE); | |
864 | ||
865 | dma_mapping_failed: | |
866 | mempool_free(request, info->request_mempool); | |
867 | return rc; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Extend the credits to remote peer | |
872 | * This implements [MS-SMBD] 3.1.5.9 | |
873 | * The idea is that we should extend credits to remote peer as quickly as | |
874 | * it's allowed, to maintain data flow. We allocate as much receive | |
875 | * buffer as possible, and extend the receive credits to remote peer | |
876 | * return value: the new credtis being granted. | |
877 | */ | |
878 | static int manage_credits_prior_sending(struct smbd_connection *info) | |
879 | { | |
880 | int new_credits; | |
881 | ||
882 | spin_lock(&info->lock_new_credits_offered); | |
883 | new_credits = info->new_credits_offered; | |
884 | info->new_credits_offered = 0; | |
885 | spin_unlock(&info->lock_new_credits_offered); | |
886 | ||
887 | return new_credits; | |
888 | } | |
889 | ||
890 | /* | |
891 | * Check if we need to send a KEEP_ALIVE message | |
892 | * The idle connection timer triggers a KEEP_ALIVE message when expires | |
893 | * SMB_DIRECT_RESPONSE_REQUESTED is set in the message flag to have peer send | |
894 | * back a response. | |
895 | * return value: | |
896 | * 1 if SMB_DIRECT_RESPONSE_REQUESTED needs to be set | |
897 | * 0: otherwise | |
898 | */ | |
899 | static int manage_keep_alive_before_sending(struct smbd_connection *info) | |
900 | { | |
901 | if (info->keep_alive_requested == KEEP_ALIVE_PENDING) { | |
902 | info->keep_alive_requested = KEEP_ALIVE_SENT; | |
903 | return 1; | |
904 | } | |
905 | return 0; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Build and prepare the SMBD packet header | |
910 | * This function waits for avaialbe send credits and build a SMBD packet | |
911 | * header. The caller then optional append payload to the packet after | |
912 | * the header | |
913 | * intput values | |
914 | * size: the size of the payload | |
915 | * remaining_data_length: remaining data to send if this is part of a | |
916 | * fragmented packet | |
917 | * output values | |
918 | * request_out: the request allocated from this function | |
919 | * return values: 0 on success, otherwise actual error code returned | |
920 | */ | |
921 | static int smbd_create_header(struct smbd_connection *info, | |
922 | int size, int remaining_data_length, | |
923 | struct smbd_request **request_out) | |
924 | { | |
925 | struct smbd_request *request; | |
926 | struct smbd_data_transfer *packet; | |
927 | int header_length; | |
928 | int rc; | |
929 | ||
930 | /* Wait for send credits. A SMBD packet needs one credit */ | |
931 | rc = wait_event_interruptible(info->wait_send_queue, | |
932 | atomic_read(&info->send_credits) > 0 || | |
933 | info->transport_status != SMBD_CONNECTED); | |
934 | if (rc) | |
935 | return rc; | |
936 | ||
937 | if (info->transport_status != SMBD_CONNECTED) { | |
938 | log_outgoing(ERR, "disconnected not sending\n"); | |
939 | return -ENOENT; | |
940 | } | |
941 | atomic_dec(&info->send_credits); | |
942 | ||
943 | request = mempool_alloc(info->request_mempool, GFP_KERNEL); | |
944 | if (!request) { | |
945 | rc = -ENOMEM; | |
946 | goto err; | |
947 | } | |
948 | ||
949 | request->info = info; | |
950 | ||
951 | /* Fill in the packet header */ | |
952 | packet = smbd_request_payload(request); | |
953 | packet->credits_requested = cpu_to_le16(info->send_credit_target); | |
954 | packet->credits_granted = | |
955 | cpu_to_le16(manage_credits_prior_sending(info)); | |
956 | info->send_immediate = false; | |
957 | ||
958 | packet->flags = 0; | |
959 | if (manage_keep_alive_before_sending(info)) | |
960 | packet->flags |= cpu_to_le16(SMB_DIRECT_RESPONSE_REQUESTED); | |
961 | ||
962 | packet->reserved = 0; | |
963 | if (!size) | |
964 | packet->data_offset = 0; | |
965 | else | |
966 | packet->data_offset = cpu_to_le32(24); | |
967 | packet->data_length = cpu_to_le32(size); | |
968 | packet->remaining_data_length = cpu_to_le32(remaining_data_length); | |
969 | packet->padding = 0; | |
970 | ||
971 | log_outgoing(INFO, "credits_requested=%d credits_granted=%d " | |
972 | "data_offset=%d data_length=%d remaining_data_length=%d\n", | |
973 | le16_to_cpu(packet->credits_requested), | |
974 | le16_to_cpu(packet->credits_granted), | |
975 | le32_to_cpu(packet->data_offset), | |
976 | le32_to_cpu(packet->data_length), | |
977 | le32_to_cpu(packet->remaining_data_length)); | |
978 | ||
979 | /* Map the packet to DMA */ | |
980 | header_length = sizeof(struct smbd_data_transfer); | |
981 | /* If this is a packet without payload, don't send padding */ | |
982 | if (!size) | |
983 | header_length = offsetof(struct smbd_data_transfer, padding); | |
984 | ||
985 | request->num_sge = 1; | |
986 | request->sge[0].addr = ib_dma_map_single(info->id->device, | |
987 | (void *)packet, | |
988 | header_length, | |
989 | DMA_BIDIRECTIONAL); | |
990 | if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { | |
991 | mempool_free(request, info->request_mempool); | |
992 | rc = -EIO; | |
993 | goto err; | |
994 | } | |
995 | ||
996 | request->sge[0].length = header_length; | |
997 | request->sge[0].lkey = info->pd->local_dma_lkey; | |
998 | ||
999 | *request_out = request; | |
1000 | return 0; | |
1001 | ||
1002 | err: | |
1003 | atomic_inc(&info->send_credits); | |
1004 | return rc; | |
1005 | } | |
1006 | ||
1007 | static void smbd_destroy_header(struct smbd_connection *info, | |
1008 | struct smbd_request *request) | |
1009 | { | |
1010 | ||
1011 | ib_dma_unmap_single(info->id->device, | |
1012 | request->sge[0].addr, | |
1013 | request->sge[0].length, | |
1014 | DMA_TO_DEVICE); | |
1015 | mempool_free(request, info->request_mempool); | |
1016 | atomic_inc(&info->send_credits); | |
1017 | } | |
1018 | ||
1019 | /* Post the send request */ | |
1020 | static int smbd_post_send(struct smbd_connection *info, | |
1021 | struct smbd_request *request, bool has_payload) | |
1022 | { | |
1023 | struct ib_send_wr send_wr, *send_wr_fail; | |
1024 | int rc, i; | |
1025 | ||
1026 | for (i = 0; i < request->num_sge; i++) { | |
1027 | log_rdma_send(INFO, | |
ac65cb62 | 1028 | "rdma_request sge[%d] addr=%llu length=%u\n", |
f198186a LL |
1029 | i, request->sge[0].addr, request->sge[0].length); |
1030 | ib_dma_sync_single_for_device( | |
1031 | info->id->device, | |
1032 | request->sge[i].addr, | |
1033 | request->sge[i].length, | |
1034 | DMA_TO_DEVICE); | |
1035 | } | |
1036 | ||
1037 | request->cqe.done = send_done; | |
1038 | ||
1039 | send_wr.next = NULL; | |
1040 | send_wr.wr_cqe = &request->cqe; | |
1041 | send_wr.sg_list = request->sge; | |
1042 | send_wr.num_sge = request->num_sge; | |
1043 | send_wr.opcode = IB_WR_SEND; | |
1044 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1045 | ||
1046 | if (has_payload) { | |
1047 | request->has_payload = true; | |
1048 | atomic_inc(&info->send_payload_pending); | |
1049 | } else { | |
1050 | request->has_payload = false; | |
1051 | atomic_inc(&info->send_pending); | |
1052 | } | |
1053 | ||
1054 | rc = ib_post_send(info->id->qp, &send_wr, &send_wr_fail); | |
1055 | if (rc) { | |
1056 | log_rdma_send(ERR, "ib_post_send failed rc=%d\n", rc); | |
1057 | if (has_payload) { | |
1058 | if (atomic_dec_and_test(&info->send_payload_pending)) | |
1059 | wake_up(&info->wait_send_payload_pending); | |
1060 | } else { | |
1061 | if (atomic_dec_and_test(&info->send_pending)) | |
1062 | wake_up(&info->wait_send_pending); | |
1063 | } | |
1064 | } else | |
1065 | /* Reset timer for idle connection after packet is sent */ | |
1066 | mod_delayed_work(info->workqueue, &info->idle_timer_work, | |
1067 | info->keep_alive_interval*HZ); | |
1068 | ||
1069 | return rc; | |
1070 | } | |
1071 | ||
1072 | static int smbd_post_send_sgl(struct smbd_connection *info, | |
1073 | struct scatterlist *sgl, int data_length, int remaining_data_length) | |
1074 | { | |
1075 | int num_sgs; | |
1076 | int i, rc; | |
1077 | struct smbd_request *request; | |
1078 | struct scatterlist *sg; | |
1079 | ||
1080 | rc = smbd_create_header( | |
1081 | info, data_length, remaining_data_length, &request); | |
1082 | if (rc) | |
1083 | return rc; | |
1084 | ||
1085 | num_sgs = sgl ? sg_nents(sgl) : 0; | |
1086 | for_each_sg(sgl, sg, num_sgs, i) { | |
1087 | request->sge[i+1].addr = | |
1088 | ib_dma_map_page(info->id->device, sg_page(sg), | |
1089 | sg->offset, sg->length, DMA_BIDIRECTIONAL); | |
1090 | if (ib_dma_mapping_error( | |
1091 | info->id->device, request->sge[i+1].addr)) { | |
1092 | rc = -EIO; | |
1093 | request->sge[i+1].addr = 0; | |
1094 | goto dma_mapping_failure; | |
1095 | } | |
1096 | request->sge[i+1].length = sg->length; | |
1097 | request->sge[i+1].lkey = info->pd->local_dma_lkey; | |
1098 | request->num_sge++; | |
1099 | } | |
1100 | ||
1101 | rc = smbd_post_send(info, request, data_length); | |
1102 | if (!rc) | |
1103 | return 0; | |
1104 | ||
1105 | dma_mapping_failure: | |
1106 | for (i = 1; i < request->num_sge; i++) | |
1107 | if (request->sge[i].addr) | |
1108 | ib_dma_unmap_single(info->id->device, | |
1109 | request->sge[i].addr, | |
1110 | request->sge[i].length, | |
1111 | DMA_TO_DEVICE); | |
1112 | smbd_destroy_header(info, request); | |
1113 | return rc; | |
1114 | } | |
1115 | ||
d649e1bb LL |
1116 | /* |
1117 | * Send a page | |
1118 | * page: the page to send | |
1119 | * offset: offset in the page to send | |
1120 | * size: length in the page to send | |
1121 | * remaining_data_length: remaining data to send in this payload | |
1122 | */ | |
1123 | static int smbd_post_send_page(struct smbd_connection *info, struct page *page, | |
1124 | unsigned long offset, size_t size, int remaining_data_length) | |
1125 | { | |
1126 | struct scatterlist sgl; | |
1127 | ||
1128 | sg_init_table(&sgl, 1); | |
1129 | sg_set_page(&sgl, page, size, offset); | |
1130 | ||
1131 | return smbd_post_send_sgl(info, &sgl, size, remaining_data_length); | |
1132 | } | |
1133 | ||
f198186a LL |
1134 | /* |
1135 | * Send an empty message | |
1136 | * Empty message is used to extend credits to peer to for keep live | |
1137 | * while there is no upper layer payload to send at the time | |
1138 | */ | |
1139 | static int smbd_post_send_empty(struct smbd_connection *info) | |
1140 | { | |
1141 | info->count_send_empty++; | |
1142 | return smbd_post_send_sgl(info, NULL, 0, 0); | |
1143 | } | |
1144 | ||
d649e1bb LL |
1145 | /* |
1146 | * Send a data buffer | |
1147 | * iov: the iov array describing the data buffers | |
1148 | * n_vec: number of iov array | |
1149 | * remaining_data_length: remaining data to send following this packet | |
1150 | * in segmented SMBD packet | |
1151 | */ | |
1152 | static int smbd_post_send_data( | |
1153 | struct smbd_connection *info, struct kvec *iov, int n_vec, | |
1154 | int remaining_data_length) | |
1155 | { | |
1156 | int i; | |
1157 | u32 data_length = 0; | |
1158 | struct scatterlist sgl[SMBDIRECT_MAX_SGE]; | |
1159 | ||
1160 | if (n_vec > SMBDIRECT_MAX_SGE) { | |
1161 | cifs_dbg(VFS, "Can't fit data to SGL, n_vec=%d\n", n_vec); | |
1162 | return -ENOMEM; | |
1163 | } | |
1164 | ||
1165 | sg_init_table(sgl, n_vec); | |
1166 | for (i = 0; i < n_vec; i++) { | |
1167 | data_length += iov[i].iov_len; | |
1168 | sg_set_buf(&sgl[i], iov[i].iov_base, iov[i].iov_len); | |
1169 | } | |
1170 | ||
1171 | return smbd_post_send_sgl(info, sgl, data_length, remaining_data_length); | |
1172 | } | |
1173 | ||
f198186a LL |
1174 | /* |
1175 | * Post a receive request to the transport | |
1176 | * The remote peer can only send data when a receive request is posted | |
1177 | * The interaction is controlled by send/receive credit system | |
1178 | */ | |
1179 | static int smbd_post_recv( | |
1180 | struct smbd_connection *info, struct smbd_response *response) | |
1181 | { | |
1182 | struct ib_recv_wr recv_wr, *recv_wr_fail = NULL; | |
1183 | int rc = -EIO; | |
1184 | ||
1185 | response->sge.addr = ib_dma_map_single( | |
1186 | info->id->device, response->packet, | |
1187 | info->max_receive_size, DMA_FROM_DEVICE); | |
1188 | if (ib_dma_mapping_error(info->id->device, response->sge.addr)) | |
1189 | return rc; | |
1190 | ||
1191 | response->sge.length = info->max_receive_size; | |
1192 | response->sge.lkey = info->pd->local_dma_lkey; | |
1193 | ||
1194 | response->cqe.done = recv_done; | |
1195 | ||
1196 | recv_wr.wr_cqe = &response->cqe; | |
1197 | recv_wr.next = NULL; | |
1198 | recv_wr.sg_list = &response->sge; | |
1199 | recv_wr.num_sge = 1; | |
1200 | ||
1201 | rc = ib_post_recv(info->id->qp, &recv_wr, &recv_wr_fail); | |
1202 | if (rc) { | |
1203 | ib_dma_unmap_single(info->id->device, response->sge.addr, | |
1204 | response->sge.length, DMA_FROM_DEVICE); | |
1205 | ||
1206 | log_rdma_recv(ERR, "ib_post_recv failed rc=%d\n", rc); | |
1207 | } | |
1208 | ||
1209 | return rc; | |
1210 | } | |
1211 | ||
1212 | /* Perform SMBD negotiate according to [MS-SMBD] 3.1.5.2 */ | |
1213 | static int smbd_negotiate(struct smbd_connection *info) | |
1214 | { | |
1215 | int rc; | |
1216 | struct smbd_response *response = get_receive_buffer(info); | |
1217 | ||
1218 | response->type = SMBD_NEGOTIATE_RESP; | |
1219 | rc = smbd_post_recv(info, response); | |
1220 | log_rdma_event(INFO, | |
1221 | "smbd_post_recv rc=%d iov.addr=%llx iov.length=%x " | |
1222 | "iov.lkey=%x\n", | |
1223 | rc, response->sge.addr, | |
1224 | response->sge.length, response->sge.lkey); | |
1225 | if (rc) | |
1226 | return rc; | |
1227 | ||
1228 | init_completion(&info->negotiate_completion); | |
1229 | info->negotiate_done = false; | |
1230 | rc = smbd_post_send_negotiate_req(info); | |
1231 | if (rc) | |
1232 | return rc; | |
1233 | ||
1234 | rc = wait_for_completion_interruptible_timeout( | |
1235 | &info->negotiate_completion, SMBD_NEGOTIATE_TIMEOUT * HZ); | |
1236 | log_rdma_event(INFO, "wait_for_completion_timeout rc=%d\n", rc); | |
1237 | ||
1238 | if (info->negotiate_done) | |
1239 | return 0; | |
1240 | ||
1241 | if (rc == 0) | |
1242 | rc = -ETIMEDOUT; | |
1243 | else if (rc == -ERESTARTSYS) | |
1244 | rc = -EINTR; | |
1245 | else | |
1246 | rc = -ENOTCONN; | |
1247 | ||
1248 | return rc; | |
1249 | } | |
1250 | ||
1251 | static void put_empty_packet( | |
1252 | struct smbd_connection *info, struct smbd_response *response) | |
1253 | { | |
1254 | spin_lock(&info->empty_packet_queue_lock); | |
1255 | list_add_tail(&response->list, &info->empty_packet_queue); | |
1256 | info->count_empty_packet_queue++; | |
1257 | spin_unlock(&info->empty_packet_queue_lock); | |
1258 | ||
1259 | queue_work(info->workqueue, &info->post_send_credits_work); | |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1 | |
1264 | * This is a queue for reassembling upper layer payload and present to upper | |
1265 | * layer. All the inncoming payload go to the reassembly queue, regardless of | |
1266 | * if reassembly is required. The uuper layer code reads from the queue for all | |
1267 | * incoming payloads. | |
1268 | * Put a received packet to the reassembly queue | |
1269 | * response: the packet received | |
1270 | * data_length: the size of payload in this packet | |
1271 | */ | |
1272 | static void enqueue_reassembly( | |
1273 | struct smbd_connection *info, | |
1274 | struct smbd_response *response, | |
1275 | int data_length) | |
1276 | { | |
1277 | spin_lock(&info->reassembly_queue_lock); | |
1278 | list_add_tail(&response->list, &info->reassembly_queue); | |
1279 | info->reassembly_queue_length++; | |
1280 | /* | |
1281 | * Make sure reassembly_data_length is updated after list and | |
1282 | * reassembly_queue_length are updated. On the dequeue side | |
1283 | * reassembly_data_length is checked without a lock to determine | |
1284 | * if reassembly_queue_length and list is up to date | |
1285 | */ | |
1286 | virt_wmb(); | |
1287 | info->reassembly_data_length += data_length; | |
1288 | spin_unlock(&info->reassembly_queue_lock); | |
1289 | info->count_reassembly_queue++; | |
1290 | info->count_enqueue_reassembly_queue++; | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Get the first entry at the front of reassembly queue | |
1295 | * Caller is responsible for locking | |
1296 | * return value: the first entry if any, NULL if queue is empty | |
1297 | */ | |
1298 | static struct smbd_response *_get_first_reassembly(struct smbd_connection *info) | |
1299 | { | |
1300 | struct smbd_response *ret = NULL; | |
1301 | ||
1302 | if (!list_empty(&info->reassembly_queue)) { | |
1303 | ret = list_first_entry( | |
1304 | &info->reassembly_queue, | |
1305 | struct smbd_response, list); | |
1306 | } | |
1307 | return ret; | |
1308 | } | |
1309 | ||
1310 | static struct smbd_response *get_empty_queue_buffer( | |
1311 | struct smbd_connection *info) | |
1312 | { | |
1313 | struct smbd_response *ret = NULL; | |
1314 | unsigned long flags; | |
1315 | ||
1316 | spin_lock_irqsave(&info->empty_packet_queue_lock, flags); | |
1317 | if (!list_empty(&info->empty_packet_queue)) { | |
1318 | ret = list_first_entry( | |
1319 | &info->empty_packet_queue, | |
1320 | struct smbd_response, list); | |
1321 | list_del(&ret->list); | |
1322 | info->count_empty_packet_queue--; | |
1323 | } | |
1324 | spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags); | |
1325 | ||
1326 | return ret; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Get a receive buffer | |
1331 | * For each remote send, we need to post a receive. The receive buffers are | |
1332 | * pre-allocated in advance. | |
1333 | * return value: the receive buffer, NULL if none is available | |
1334 | */ | |
1335 | static struct smbd_response *get_receive_buffer(struct smbd_connection *info) | |
1336 | { | |
1337 | struct smbd_response *ret = NULL; | |
1338 | unsigned long flags; | |
1339 | ||
1340 | spin_lock_irqsave(&info->receive_queue_lock, flags); | |
1341 | if (!list_empty(&info->receive_queue)) { | |
1342 | ret = list_first_entry( | |
1343 | &info->receive_queue, | |
1344 | struct smbd_response, list); | |
1345 | list_del(&ret->list); | |
1346 | info->count_receive_queue--; | |
1347 | info->count_get_receive_buffer++; | |
1348 | } | |
1349 | spin_unlock_irqrestore(&info->receive_queue_lock, flags); | |
1350 | ||
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | /* | |
1355 | * Return a receive buffer | |
1356 | * Upon returning of a receive buffer, we can post new receive and extend | |
1357 | * more receive credits to remote peer. This is done immediately after a | |
1358 | * receive buffer is returned. | |
1359 | */ | |
1360 | static void put_receive_buffer( | |
1361 | struct smbd_connection *info, struct smbd_response *response) | |
1362 | { | |
1363 | unsigned long flags; | |
1364 | ||
1365 | ib_dma_unmap_single(info->id->device, response->sge.addr, | |
1366 | response->sge.length, DMA_FROM_DEVICE); | |
1367 | ||
1368 | spin_lock_irqsave(&info->receive_queue_lock, flags); | |
1369 | list_add_tail(&response->list, &info->receive_queue); | |
1370 | info->count_receive_queue++; | |
1371 | info->count_put_receive_buffer++; | |
1372 | spin_unlock_irqrestore(&info->receive_queue_lock, flags); | |
1373 | ||
1374 | queue_work(info->workqueue, &info->post_send_credits_work); | |
1375 | } | |
1376 | ||
1377 | /* Preallocate all receive buffer on transport establishment */ | |
1378 | static int allocate_receive_buffers(struct smbd_connection *info, int num_buf) | |
1379 | { | |
1380 | int i; | |
1381 | struct smbd_response *response; | |
1382 | ||
1383 | INIT_LIST_HEAD(&info->reassembly_queue); | |
1384 | spin_lock_init(&info->reassembly_queue_lock); | |
1385 | info->reassembly_data_length = 0; | |
1386 | info->reassembly_queue_length = 0; | |
1387 | ||
1388 | INIT_LIST_HEAD(&info->receive_queue); | |
1389 | spin_lock_init(&info->receive_queue_lock); | |
1390 | info->count_receive_queue = 0; | |
1391 | ||
1392 | INIT_LIST_HEAD(&info->empty_packet_queue); | |
1393 | spin_lock_init(&info->empty_packet_queue_lock); | |
1394 | info->count_empty_packet_queue = 0; | |
1395 | ||
1396 | init_waitqueue_head(&info->wait_receive_queues); | |
1397 | ||
1398 | for (i = 0; i < num_buf; i++) { | |
1399 | response = mempool_alloc(info->response_mempool, GFP_KERNEL); | |
1400 | if (!response) | |
1401 | goto allocate_failed; | |
1402 | ||
1403 | response->info = info; | |
1404 | list_add_tail(&response->list, &info->receive_queue); | |
1405 | info->count_receive_queue++; | |
1406 | } | |
1407 | ||
1408 | return 0; | |
1409 | ||
1410 | allocate_failed: | |
1411 | while (!list_empty(&info->receive_queue)) { | |
1412 | response = list_first_entry( | |
1413 | &info->receive_queue, | |
1414 | struct smbd_response, list); | |
1415 | list_del(&response->list); | |
1416 | info->count_receive_queue--; | |
1417 | ||
1418 | mempool_free(response, info->response_mempool); | |
1419 | } | |
1420 | return -ENOMEM; | |
1421 | } | |
1422 | ||
1423 | static void destroy_receive_buffers(struct smbd_connection *info) | |
1424 | { | |
1425 | struct smbd_response *response; | |
1426 | ||
1427 | while ((response = get_receive_buffer(info))) | |
1428 | mempool_free(response, info->response_mempool); | |
1429 | ||
1430 | while ((response = get_empty_queue_buffer(info))) | |
1431 | mempool_free(response, info->response_mempool); | |
1432 | } | |
1433 | ||
1434 | /* | |
1435 | * Check and send an immediate or keep alive packet | |
1436 | * The condition to send those packets are defined in [MS-SMBD] 3.1.1.1 | |
1437 | * Connection.KeepaliveRequested and Connection.SendImmediate | |
1438 | * The idea is to extend credits to server as soon as it becomes available | |
1439 | */ | |
1440 | static void send_immediate_work(struct work_struct *work) | |
1441 | { | |
1442 | struct smbd_connection *info = container_of( | |
1443 | work, struct smbd_connection, | |
1444 | send_immediate_work.work); | |
1445 | ||
1446 | if (info->keep_alive_requested == KEEP_ALIVE_PENDING || | |
1447 | info->send_immediate) { | |
1448 | log_keep_alive(INFO, "send an empty message\n"); | |
1449 | smbd_post_send_empty(info); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | /* Implement idle connection timer [MS-SMBD] 3.1.6.2 */ | |
1454 | static void idle_connection_timer(struct work_struct *work) | |
1455 | { | |
1456 | struct smbd_connection *info = container_of( | |
1457 | work, struct smbd_connection, | |
1458 | idle_timer_work.work); | |
1459 | ||
1460 | if (info->keep_alive_requested != KEEP_ALIVE_NONE) { | |
1461 | log_keep_alive(ERR, | |
1462 | "error status info->keep_alive_requested=%d\n", | |
1463 | info->keep_alive_requested); | |
1464 | smbd_disconnect_rdma_connection(info); | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | log_keep_alive(INFO, "about to send an empty idle message\n"); | |
1469 | smbd_post_send_empty(info); | |
1470 | ||
1471 | /* Setup the next idle timeout work */ | |
1472 | queue_delayed_work(info->workqueue, &info->idle_timer_work, | |
1473 | info->keep_alive_interval*HZ); | |
1474 | } | |
1475 | ||
8ef130f9 LL |
1476 | /* Destroy this SMBD connection, called from upper layer */ |
1477 | void smbd_destroy(struct smbd_connection *info) | |
1478 | { | |
1479 | log_rdma_event(INFO, "destroying rdma session\n"); | |
1480 | ||
1481 | /* Kick off the disconnection process */ | |
1482 | smbd_disconnect_rdma_connection(info); | |
1483 | ||
1484 | log_rdma_event(INFO, "wait for transport being destroyed\n"); | |
1485 | wait_event(info->wait_destroy, | |
1486 | info->transport_status == SMBD_DESTROYED); | |
1487 | ||
1488 | destroy_workqueue(info->workqueue); | |
1489 | kfree(info); | |
1490 | } | |
1491 | ||
ad57b8e1 LL |
1492 | /* |
1493 | * Reconnect this SMBD connection, called from upper layer | |
1494 | * return value: 0 on success, or actual error code | |
1495 | */ | |
1496 | int smbd_reconnect(struct TCP_Server_Info *server) | |
1497 | { | |
1498 | log_rdma_event(INFO, "reconnecting rdma session\n"); | |
1499 | ||
1500 | if (!server->smbd_conn) { | |
48f238a7 LL |
1501 | log_rdma_event(INFO, "rdma session already destroyed\n"); |
1502 | goto create_conn; | |
ad57b8e1 LL |
1503 | } |
1504 | ||
1505 | /* | |
1506 | * This is possible if transport is disconnected and we haven't received | |
1507 | * notification from RDMA, but upper layer has detected timeout | |
1508 | */ | |
1509 | if (server->smbd_conn->transport_status == SMBD_CONNECTED) { | |
1510 | log_rdma_event(INFO, "disconnecting transport\n"); | |
1511 | smbd_disconnect_rdma_connection(server->smbd_conn); | |
1512 | } | |
1513 | ||
1514 | /* wait until the transport is destroyed */ | |
48f238a7 LL |
1515 | if (!wait_event_timeout(server->smbd_conn->wait_destroy, |
1516 | server->smbd_conn->transport_status == SMBD_DESTROYED, 5*HZ)) | |
1517 | return -EAGAIN; | |
ad57b8e1 LL |
1518 | |
1519 | destroy_workqueue(server->smbd_conn->workqueue); | |
1520 | kfree(server->smbd_conn); | |
1521 | ||
48f238a7 | 1522 | create_conn: |
ad57b8e1 LL |
1523 | log_rdma_event(INFO, "creating rdma session\n"); |
1524 | server->smbd_conn = smbd_get_connection( | |
1525 | server, (struct sockaddr *) &server->dstaddr); | |
48f238a7 LL |
1526 | log_rdma_event(INFO, "created rdma session info=%p\n", |
1527 | server->smbd_conn); | |
ad57b8e1 LL |
1528 | |
1529 | return server->smbd_conn ? 0 : -ENOENT; | |
1530 | } | |
1531 | ||
f198186a LL |
1532 | static void destroy_caches_and_workqueue(struct smbd_connection *info) |
1533 | { | |
1534 | destroy_receive_buffers(info); | |
1535 | destroy_workqueue(info->workqueue); | |
1536 | mempool_destroy(info->response_mempool); | |
1537 | kmem_cache_destroy(info->response_cache); | |
1538 | mempool_destroy(info->request_mempool); | |
1539 | kmem_cache_destroy(info->request_cache); | |
1540 | } | |
1541 | ||
1542 | #define MAX_NAME_LEN 80 | |
1543 | static int allocate_caches_and_workqueue(struct smbd_connection *info) | |
1544 | { | |
1545 | char name[MAX_NAME_LEN]; | |
1546 | int rc; | |
1547 | ||
1548 | snprintf(name, MAX_NAME_LEN, "smbd_request_%p", info); | |
1549 | info->request_cache = | |
1550 | kmem_cache_create( | |
1551 | name, | |
1552 | sizeof(struct smbd_request) + | |
1553 | sizeof(struct smbd_data_transfer), | |
1554 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
1555 | if (!info->request_cache) | |
1556 | return -ENOMEM; | |
1557 | ||
1558 | info->request_mempool = | |
1559 | mempool_create(info->send_credit_target, mempool_alloc_slab, | |
1560 | mempool_free_slab, info->request_cache); | |
1561 | if (!info->request_mempool) | |
1562 | goto out1; | |
1563 | ||
1564 | snprintf(name, MAX_NAME_LEN, "smbd_response_%p", info); | |
1565 | info->response_cache = | |
1566 | kmem_cache_create( | |
1567 | name, | |
1568 | sizeof(struct smbd_response) + | |
1569 | info->max_receive_size, | |
1570 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
1571 | if (!info->response_cache) | |
1572 | goto out2; | |
1573 | ||
1574 | info->response_mempool = | |
1575 | mempool_create(info->receive_credit_max, mempool_alloc_slab, | |
1576 | mempool_free_slab, info->response_cache); | |
1577 | if (!info->response_mempool) | |
1578 | goto out3; | |
1579 | ||
1580 | snprintf(name, MAX_NAME_LEN, "smbd_%p", info); | |
1581 | info->workqueue = create_workqueue(name); | |
1582 | if (!info->workqueue) | |
1583 | goto out4; | |
1584 | ||
1585 | rc = allocate_receive_buffers(info, info->receive_credit_max); | |
1586 | if (rc) { | |
1587 | log_rdma_event(ERR, "failed to allocate receive buffers\n"); | |
1588 | goto out5; | |
1589 | } | |
1590 | ||
1591 | return 0; | |
1592 | ||
1593 | out5: | |
1594 | destroy_workqueue(info->workqueue); | |
1595 | out4: | |
1596 | mempool_destroy(info->response_mempool); | |
1597 | out3: | |
1598 | kmem_cache_destroy(info->response_cache); | |
1599 | out2: | |
1600 | mempool_destroy(info->request_mempool); | |
1601 | out1: | |
1602 | kmem_cache_destroy(info->request_cache); | |
1603 | return -ENOMEM; | |
1604 | } | |
1605 | ||
1606 | /* Create a SMBD connection, called by upper layer */ | |
9084432c | 1607 | static struct smbd_connection *_smbd_get_connection( |
f198186a LL |
1608 | struct TCP_Server_Info *server, struct sockaddr *dstaddr, int port) |
1609 | { | |
1610 | int rc; | |
1611 | struct smbd_connection *info; | |
1612 | struct rdma_conn_param conn_param; | |
1613 | struct ib_qp_init_attr qp_attr; | |
1614 | struct sockaddr_in *addr_in = (struct sockaddr_in *) dstaddr; | |
c7398583 LL |
1615 | struct ib_port_immutable port_immutable; |
1616 | u32 ird_ord_hdr[2]; | |
f198186a LL |
1617 | |
1618 | info = kzalloc(sizeof(struct smbd_connection), GFP_KERNEL); | |
1619 | if (!info) | |
1620 | return NULL; | |
1621 | ||
1622 | info->transport_status = SMBD_CONNECTING; | |
1623 | rc = smbd_ia_open(info, dstaddr, port); | |
1624 | if (rc) { | |
1625 | log_rdma_event(INFO, "smbd_ia_open rc=%d\n", rc); | |
1626 | goto create_id_failed; | |
1627 | } | |
1628 | ||
1629 | if (smbd_send_credit_target > info->id->device->attrs.max_cqe || | |
1630 | smbd_send_credit_target > info->id->device->attrs.max_qp_wr) { | |
1631 | log_rdma_event(ERR, | |
1632 | "consider lowering send_credit_target = %d. " | |
1633 | "Possible CQE overrun, device " | |
1634 | "reporting max_cpe %d max_qp_wr %d\n", | |
1635 | smbd_send_credit_target, | |
1636 | info->id->device->attrs.max_cqe, | |
1637 | info->id->device->attrs.max_qp_wr); | |
1638 | goto config_failed; | |
1639 | } | |
1640 | ||
1641 | if (smbd_receive_credit_max > info->id->device->attrs.max_cqe || | |
1642 | smbd_receive_credit_max > info->id->device->attrs.max_qp_wr) { | |
1643 | log_rdma_event(ERR, | |
1644 | "consider lowering receive_credit_max = %d. " | |
1645 | "Possible CQE overrun, device " | |
1646 | "reporting max_cpe %d max_qp_wr %d\n", | |
1647 | smbd_receive_credit_max, | |
1648 | info->id->device->attrs.max_cqe, | |
1649 | info->id->device->attrs.max_qp_wr); | |
1650 | goto config_failed; | |
1651 | } | |
1652 | ||
1653 | info->receive_credit_max = smbd_receive_credit_max; | |
1654 | info->send_credit_target = smbd_send_credit_target; | |
1655 | info->max_send_size = smbd_max_send_size; | |
1656 | info->max_fragmented_recv_size = smbd_max_fragmented_recv_size; | |
1657 | info->max_receive_size = smbd_max_receive_size; | |
1658 | info->keep_alive_interval = smbd_keep_alive_interval; | |
1659 | ||
1660 | if (info->id->device->attrs.max_sge < SMBDIRECT_MAX_SGE) { | |
1661 | log_rdma_event(ERR, "warning: device max_sge = %d too small\n", | |
1662 | info->id->device->attrs.max_sge); | |
1663 | log_rdma_event(ERR, "Queue Pair creation may fail\n"); | |
1664 | } | |
1665 | ||
1666 | info->send_cq = NULL; | |
1667 | info->recv_cq = NULL; | |
1668 | info->send_cq = ib_alloc_cq(info->id->device, info, | |
1669 | info->send_credit_target, 0, IB_POLL_SOFTIRQ); | |
1670 | if (IS_ERR(info->send_cq)) { | |
1671 | info->send_cq = NULL; | |
1672 | goto alloc_cq_failed; | |
1673 | } | |
1674 | ||
1675 | info->recv_cq = ib_alloc_cq(info->id->device, info, | |
1676 | info->receive_credit_max, 0, IB_POLL_SOFTIRQ); | |
1677 | if (IS_ERR(info->recv_cq)) { | |
1678 | info->recv_cq = NULL; | |
1679 | goto alloc_cq_failed; | |
1680 | } | |
1681 | ||
1682 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
1683 | qp_attr.event_handler = smbd_qp_async_error_upcall; | |
1684 | qp_attr.qp_context = info; | |
1685 | qp_attr.cap.max_send_wr = info->send_credit_target; | |
1686 | qp_attr.cap.max_recv_wr = info->receive_credit_max; | |
1687 | qp_attr.cap.max_send_sge = SMBDIRECT_MAX_SGE; | |
1688 | qp_attr.cap.max_recv_sge = SMBDIRECT_MAX_SGE; | |
1689 | qp_attr.cap.max_inline_data = 0; | |
1690 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
1691 | qp_attr.qp_type = IB_QPT_RC; | |
1692 | qp_attr.send_cq = info->send_cq; | |
1693 | qp_attr.recv_cq = info->recv_cq; | |
1694 | qp_attr.port_num = ~0; | |
1695 | ||
1696 | rc = rdma_create_qp(info->id, info->pd, &qp_attr); | |
1697 | if (rc) { | |
1698 | log_rdma_event(ERR, "rdma_create_qp failed %i\n", rc); | |
1699 | goto create_qp_failed; | |
1700 | } | |
1701 | ||
1702 | memset(&conn_param, 0, sizeof(conn_param)); | |
1703 | conn_param.initiator_depth = 0; | |
1704 | ||
c7398583 LL |
1705 | conn_param.responder_resources = |
1706 | info->id->device->attrs.max_qp_rd_atom | |
1707 | < SMBD_CM_RESPONDER_RESOURCES ? | |
1708 | info->id->device->attrs.max_qp_rd_atom : | |
1709 | SMBD_CM_RESPONDER_RESOURCES; | |
1710 | info->responder_resources = conn_param.responder_resources; | |
1711 | log_rdma_mr(INFO, "responder_resources=%d\n", | |
1712 | info->responder_resources); | |
1713 | ||
1714 | /* Need to send IRD/ORD in private data for iWARP */ | |
1715 | info->id->device->get_port_immutable( | |
1716 | info->id->device, info->id->port_num, &port_immutable); | |
1717 | if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { | |
1718 | ird_ord_hdr[0] = info->responder_resources; | |
1719 | ird_ord_hdr[1] = 1; | |
1720 | conn_param.private_data = ird_ord_hdr; | |
1721 | conn_param.private_data_len = sizeof(ird_ord_hdr); | |
1722 | } else { | |
1723 | conn_param.private_data = NULL; | |
1724 | conn_param.private_data_len = 0; | |
1725 | } | |
1726 | ||
f198186a LL |
1727 | conn_param.retry_count = SMBD_CM_RETRY; |
1728 | conn_param.rnr_retry_count = SMBD_CM_RNR_RETRY; | |
1729 | conn_param.flow_control = 0; | |
1730 | init_waitqueue_head(&info->wait_destroy); | |
1731 | ||
1732 | log_rdma_event(INFO, "connecting to IP %pI4 port %d\n", | |
1733 | &addr_in->sin_addr, port); | |
1734 | ||
1735 | init_waitqueue_head(&info->conn_wait); | |
1736 | rc = rdma_connect(info->id, &conn_param); | |
1737 | if (rc) { | |
1738 | log_rdma_event(ERR, "rdma_connect() failed with %i\n", rc); | |
1739 | goto rdma_connect_failed; | |
1740 | } | |
1741 | ||
1742 | wait_event_interruptible( | |
1743 | info->conn_wait, info->transport_status != SMBD_CONNECTING); | |
1744 | ||
1745 | if (info->transport_status != SMBD_CONNECTED) { | |
1746 | log_rdma_event(ERR, "rdma_connect failed port=%d\n", port); | |
1747 | goto rdma_connect_failed; | |
1748 | } | |
1749 | ||
1750 | log_rdma_event(INFO, "rdma_connect connected\n"); | |
1751 | ||
1752 | rc = allocate_caches_and_workqueue(info); | |
1753 | if (rc) { | |
1754 | log_rdma_event(ERR, "cache allocation failed\n"); | |
1755 | goto allocate_cache_failed; | |
1756 | } | |
1757 | ||
1758 | init_waitqueue_head(&info->wait_send_queue); | |
1759 | init_waitqueue_head(&info->wait_reassembly_queue); | |
1760 | ||
1761 | INIT_DELAYED_WORK(&info->idle_timer_work, idle_connection_timer); | |
1762 | INIT_DELAYED_WORK(&info->send_immediate_work, send_immediate_work); | |
1763 | queue_delayed_work(info->workqueue, &info->idle_timer_work, | |
1764 | info->keep_alive_interval*HZ); | |
1765 | ||
d649e1bb LL |
1766 | init_waitqueue_head(&info->wait_smbd_send_pending); |
1767 | info->smbd_send_pending = 0; | |
1768 | ||
f64b78fd LL |
1769 | init_waitqueue_head(&info->wait_smbd_recv_pending); |
1770 | info->smbd_recv_pending = 0; | |
1771 | ||
f198186a LL |
1772 | init_waitqueue_head(&info->wait_send_pending); |
1773 | atomic_set(&info->send_pending, 0); | |
1774 | ||
1775 | init_waitqueue_head(&info->wait_send_payload_pending); | |
1776 | atomic_set(&info->send_payload_pending, 0); | |
1777 | ||
1778 | INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work); | |
1779 | INIT_WORK(&info->destroy_work, smbd_destroy_rdma_work); | |
1780 | INIT_WORK(&info->recv_done_work, smbd_recv_done_work); | |
1781 | INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits); | |
1782 | info->new_credits_offered = 0; | |
1783 | spin_lock_init(&info->lock_new_credits_offered); | |
1784 | ||
1785 | rc = smbd_negotiate(info); | |
1786 | if (rc) { | |
1787 | log_rdma_event(ERR, "smbd_negotiate rc=%d\n", rc); | |
1788 | goto negotiation_failed; | |
1789 | } | |
1790 | ||
c7398583 LL |
1791 | rc = allocate_mr_list(info); |
1792 | if (rc) { | |
1793 | log_rdma_mr(ERR, "memory registration allocation failed\n"); | |
1794 | goto allocate_mr_failed; | |
1795 | } | |
1796 | ||
f198186a LL |
1797 | return info; |
1798 | ||
c7398583 LL |
1799 | allocate_mr_failed: |
1800 | /* At this point, need to a full transport shutdown */ | |
1801 | smbd_destroy(info); | |
1802 | return NULL; | |
1803 | ||
f198186a LL |
1804 | negotiation_failed: |
1805 | cancel_delayed_work_sync(&info->idle_timer_work); | |
1806 | destroy_caches_and_workqueue(info); | |
1807 | info->transport_status = SMBD_NEGOTIATE_FAILED; | |
1808 | init_waitqueue_head(&info->conn_wait); | |
1809 | rdma_disconnect(info->id); | |
1810 | wait_event(info->conn_wait, | |
1811 | info->transport_status == SMBD_DISCONNECTED); | |
1812 | ||
1813 | allocate_cache_failed: | |
1814 | rdma_connect_failed: | |
1815 | rdma_destroy_qp(info->id); | |
1816 | ||
1817 | create_qp_failed: | |
1818 | alloc_cq_failed: | |
1819 | if (info->send_cq) | |
1820 | ib_free_cq(info->send_cq); | |
1821 | if (info->recv_cq) | |
1822 | ib_free_cq(info->recv_cq); | |
1823 | ||
1824 | config_failed: | |
1825 | ib_dealloc_pd(info->pd); | |
1826 | rdma_destroy_id(info->id); | |
1827 | ||
1828 | create_id_failed: | |
1829 | kfree(info); | |
1830 | return NULL; | |
1831 | } | |
399f9539 LL |
1832 | |
1833 | struct smbd_connection *smbd_get_connection( | |
1834 | struct TCP_Server_Info *server, struct sockaddr *dstaddr) | |
1835 | { | |
1836 | struct smbd_connection *ret; | |
1837 | int port = SMBD_PORT; | |
1838 | ||
1839 | try_again: | |
1840 | ret = _smbd_get_connection(server, dstaddr, port); | |
1841 | ||
1842 | /* Try SMB_PORT if SMBD_PORT doesn't work */ | |
1843 | if (!ret && port == SMBD_PORT) { | |
1844 | port = SMB_PORT; | |
1845 | goto try_again; | |
1846 | } | |
1847 | return ret; | |
1848 | } | |
f64b78fd LL |
1849 | |
1850 | /* | |
1851 | * Receive data from receive reassembly queue | |
1852 | * All the incoming data packets are placed in reassembly queue | |
1853 | * buf: the buffer to read data into | |
1854 | * size: the length of data to read | |
1855 | * return value: actual data read | |
1856 | * Note: this implementation copies the data from reassebmly queue to receive | |
1857 | * buffers used by upper layer. This is not the optimal code path. A better way | |
1858 | * to do it is to not have upper layer allocate its receive buffers but rather | |
1859 | * borrow the buffer from reassembly queue, and return it after data is | |
1860 | * consumed. But this will require more changes to upper layer code, and also | |
1861 | * need to consider packet boundaries while they still being reassembled. | |
1862 | */ | |
2026b06e SF |
1863 | static int smbd_recv_buf(struct smbd_connection *info, char *buf, |
1864 | unsigned int size) | |
f64b78fd LL |
1865 | { |
1866 | struct smbd_response *response; | |
1867 | struct smbd_data_transfer *data_transfer; | |
1868 | int to_copy, to_read, data_read, offset; | |
1869 | u32 data_length, remaining_data_length, data_offset; | |
1870 | int rc; | |
f64b78fd LL |
1871 | |
1872 | again: | |
1873 | if (info->transport_status != SMBD_CONNECTED) { | |
1874 | log_read(ERR, "disconnected\n"); | |
1875 | return -ENODEV; | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * No need to hold the reassembly queue lock all the time as we are | |
1880 | * the only one reading from the front of the queue. The transport | |
1881 | * may add more entries to the back of the queue at the same time | |
1882 | */ | |
1883 | log_read(INFO, "size=%d info->reassembly_data_length=%d\n", size, | |
1884 | info->reassembly_data_length); | |
1885 | if (info->reassembly_data_length >= size) { | |
1886 | int queue_length; | |
1887 | int queue_removed = 0; | |
1888 | ||
1889 | /* | |
1890 | * Need to make sure reassembly_data_length is read before | |
1891 | * reading reassembly_queue_length and calling | |
1892 | * _get_first_reassembly. This call is lock free | |
1893 | * as we never read at the end of the queue which are being | |
1894 | * updated in SOFTIRQ as more data is received | |
1895 | */ | |
1896 | virt_rmb(); | |
1897 | queue_length = info->reassembly_queue_length; | |
1898 | data_read = 0; | |
1899 | to_read = size; | |
1900 | offset = info->first_entry_offset; | |
1901 | while (data_read < size) { | |
1902 | response = _get_first_reassembly(info); | |
1903 | data_transfer = smbd_response_payload(response); | |
1904 | data_length = le32_to_cpu(data_transfer->data_length); | |
1905 | remaining_data_length = | |
1906 | le32_to_cpu( | |
1907 | data_transfer->remaining_data_length); | |
1908 | data_offset = le32_to_cpu(data_transfer->data_offset); | |
1909 | ||
1910 | /* | |
1911 | * The upper layer expects RFC1002 length at the | |
1912 | * beginning of the payload. Return it to indicate | |
1913 | * the total length of the packet. This minimize the | |
1914 | * change to upper layer packet processing logic. This | |
1915 | * will be eventually remove when an intermediate | |
1916 | * transport layer is added | |
1917 | */ | |
1918 | if (response->first_segment && size == 4) { | |
1919 | unsigned int rfc1002_len = | |
1920 | data_length + remaining_data_length; | |
1921 | *((__be32 *)buf) = cpu_to_be32(rfc1002_len); | |
1922 | data_read = 4; | |
1923 | response->first_segment = false; | |
1924 | log_read(INFO, "returning rfc1002 length %d\n", | |
1925 | rfc1002_len); | |
1926 | goto read_rfc1002_done; | |
1927 | } | |
1928 | ||
1929 | to_copy = min_t(int, data_length - offset, to_read); | |
1930 | memcpy( | |
1931 | buf + data_read, | |
1932 | (char *)data_transfer + data_offset + offset, | |
1933 | to_copy); | |
1934 | ||
1935 | /* move on to the next buffer? */ | |
1936 | if (to_copy == data_length - offset) { | |
1937 | queue_length--; | |
1938 | /* | |
1939 | * No need to lock if we are not at the | |
1940 | * end of the queue | |
1941 | */ | |
f9de151b SF |
1942 | if (queue_length) |
1943 | list_del(&response->list); | |
1944 | else { | |
e36c048a AB |
1945 | spin_lock_irq( |
1946 | &info->reassembly_queue_lock); | |
f9de151b | 1947 | list_del(&response->list); |
e36c048a AB |
1948 | spin_unlock_irq( |
1949 | &info->reassembly_queue_lock); | |
f9de151b SF |
1950 | } |
1951 | queue_removed++; | |
f64b78fd LL |
1952 | info->count_reassembly_queue--; |
1953 | info->count_dequeue_reassembly_queue++; | |
1954 | put_receive_buffer(info, response); | |
1955 | offset = 0; | |
1956 | log_read(INFO, "put_receive_buffer offset=0\n"); | |
1957 | } else | |
1958 | offset += to_copy; | |
1959 | ||
1960 | to_read -= to_copy; | |
1961 | data_read += to_copy; | |
1962 | ||
1963 | log_read(INFO, "_get_first_reassembly memcpy %d bytes " | |
1964 | "data_transfer_length-offset=%d after that " | |
1965 | "to_read=%d data_read=%d offset=%d\n", | |
1966 | to_copy, data_length - offset, | |
1967 | to_read, data_read, offset); | |
1968 | } | |
1969 | ||
e36c048a | 1970 | spin_lock_irq(&info->reassembly_queue_lock); |
f64b78fd LL |
1971 | info->reassembly_data_length -= data_read; |
1972 | info->reassembly_queue_length -= queue_removed; | |
e36c048a | 1973 | spin_unlock_irq(&info->reassembly_queue_lock); |
f64b78fd LL |
1974 | |
1975 | info->first_entry_offset = offset; | |
1976 | log_read(INFO, "returning to thread data_read=%d " | |
1977 | "reassembly_data_length=%d first_entry_offset=%d\n", | |
1978 | data_read, info->reassembly_data_length, | |
1979 | info->first_entry_offset); | |
1980 | read_rfc1002_done: | |
1981 | return data_read; | |
1982 | } | |
1983 | ||
1984 | log_read(INFO, "wait_event on more data\n"); | |
1985 | rc = wait_event_interruptible( | |
1986 | info->wait_reassembly_queue, | |
1987 | info->reassembly_data_length >= size || | |
1988 | info->transport_status != SMBD_CONNECTED); | |
1989 | /* Don't return any data if interrupted */ | |
1990 | if (rc) | |
1991 | return -ENODEV; | |
1992 | ||
1993 | goto again; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Receive a page from receive reassembly queue | |
1998 | * page: the page to read data into | |
1999 | * to_read: the length of data to read | |
2000 | * return value: actual data read | |
2001 | */ | |
2026b06e | 2002 | static int smbd_recv_page(struct smbd_connection *info, |
f64b78fd LL |
2003 | struct page *page, unsigned int to_read) |
2004 | { | |
2005 | int ret; | |
2006 | char *to_address; | |
2007 | ||
2008 | /* make sure we have the page ready for read */ | |
2009 | ret = wait_event_interruptible( | |
2010 | info->wait_reassembly_queue, | |
2011 | info->reassembly_data_length >= to_read || | |
2012 | info->transport_status != SMBD_CONNECTED); | |
2013 | if (ret) | |
2014 | return 0; | |
2015 | ||
2016 | /* now we can read from reassembly queue and not sleep */ | |
2017 | to_address = kmap_atomic(page); | |
2018 | ||
2019 | log_read(INFO, "reading from page=%p address=%p to_read=%d\n", | |
2020 | page, to_address, to_read); | |
2021 | ||
2022 | ret = smbd_recv_buf(info, to_address, to_read); | |
2023 | kunmap_atomic(to_address); | |
2024 | ||
2025 | return ret; | |
2026 | } | |
2027 | ||
2028 | /* | |
2029 | * Receive data from transport | |
2030 | * msg: a msghdr point to the buffer, can be ITER_KVEC or ITER_BVEC | |
2031 | * return: total bytes read, or 0. SMB Direct will not do partial read. | |
2032 | */ | |
2033 | int smbd_recv(struct smbd_connection *info, struct msghdr *msg) | |
2034 | { | |
2035 | char *buf; | |
2036 | struct page *page; | |
2037 | unsigned int to_read; | |
2038 | int rc; | |
2039 | ||
2040 | info->smbd_recv_pending++; | |
2041 | ||
2042 | switch (msg->msg_iter.type) { | |
2043 | case READ | ITER_KVEC: | |
2044 | buf = msg->msg_iter.kvec->iov_base; | |
2045 | to_read = msg->msg_iter.kvec->iov_len; | |
2046 | rc = smbd_recv_buf(info, buf, to_read); | |
2047 | break; | |
2048 | ||
2049 | case READ | ITER_BVEC: | |
2050 | page = msg->msg_iter.bvec->bv_page; | |
2051 | to_read = msg->msg_iter.bvec->bv_len; | |
2052 | rc = smbd_recv_page(info, page, to_read); | |
2053 | break; | |
2054 | ||
2055 | default: | |
2056 | /* It's a bug in upper layer to get there */ | |
2057 | cifs_dbg(VFS, "CIFS: invalid msg type %d\n", | |
2058 | msg->msg_iter.type); | |
2059 | rc = -EIO; | |
2060 | } | |
2061 | ||
2062 | info->smbd_recv_pending--; | |
2063 | wake_up(&info->wait_smbd_recv_pending); | |
2064 | ||
2065 | /* SMBDirect will read it all or nothing */ | |
2066 | if (rc > 0) | |
2067 | msg->msg_iter.count = 0; | |
2068 | return rc; | |
2069 | } | |
d649e1bb LL |
2070 | |
2071 | /* | |
2072 | * Send data to transport | |
2073 | * Each rqst is transported as a SMBDirect payload | |
2074 | * rqst: the data to write | |
2075 | * return value: 0 if successfully write, otherwise error code | |
2076 | */ | |
2077 | int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst) | |
2078 | { | |
2079 | struct kvec vec; | |
2080 | int nvecs; | |
2081 | int size; | |
2082 | int buflen = 0, remaining_data_length; | |
2083 | int start, i, j; | |
2084 | int max_iov_size = | |
2085 | info->max_send_size - sizeof(struct smbd_data_transfer); | |
2086 | struct kvec iov[SMBDIRECT_MAX_SGE]; | |
2087 | int rc; | |
2088 | ||
2089 | info->smbd_send_pending++; | |
2090 | if (info->transport_status != SMBD_CONNECTED) { | |
2091 | rc = -ENODEV; | |
2092 | goto done; | |
2093 | } | |
2094 | ||
2095 | /* | |
2096 | * This usually means a configuration error | |
2097 | * We use RDMA read/write for packet size > rdma_readwrite_threshold | |
2098 | * as long as it's properly configured we should never get into this | |
2099 | * situation | |
2100 | */ | |
2101 | if (rqst->rq_nvec + rqst->rq_npages > SMBDIRECT_MAX_SGE) { | |
2102 | log_write(ERR, "maximum send segment %x exceeding %x\n", | |
2103 | rqst->rq_nvec + rqst->rq_npages, SMBDIRECT_MAX_SGE); | |
2104 | rc = -EINVAL; | |
2105 | goto done; | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Remove the RFC1002 length defined in MS-SMB2 section 2.1 | |
2110 | * It is used only for TCP transport | |
2111 | * In future we may want to add a transport layer under protocol | |
2112 | * layer so this will only be issued to TCP transport | |
2113 | */ | |
2114 | iov[0].iov_base = (char *)rqst->rq_iov[0].iov_base + 4; | |
2115 | iov[0].iov_len = rqst->rq_iov[0].iov_len - 4; | |
2116 | buflen += iov[0].iov_len; | |
2117 | ||
2118 | /* total up iov array first */ | |
2119 | for (i = 1; i < rqst->rq_nvec; i++) { | |
2120 | iov[i].iov_base = rqst->rq_iov[i].iov_base; | |
2121 | iov[i].iov_len = rqst->rq_iov[i].iov_len; | |
2122 | buflen += iov[i].iov_len; | |
2123 | } | |
2124 | ||
2125 | /* add in the page array if there is one */ | |
2126 | if (rqst->rq_npages) { | |
2127 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1); | |
2128 | buflen += rqst->rq_tailsz; | |
2129 | } | |
2130 | ||
2131 | if (buflen + sizeof(struct smbd_data_transfer) > | |
2132 | info->max_fragmented_send_size) { | |
2133 | log_write(ERR, "payload size %d > max size %d\n", | |
2134 | buflen, info->max_fragmented_send_size); | |
2135 | rc = -EINVAL; | |
2136 | goto done; | |
2137 | } | |
2138 | ||
2139 | remaining_data_length = buflen; | |
2140 | ||
2141 | log_write(INFO, "rqst->rq_nvec=%d rqst->rq_npages=%d rq_pagesz=%d " | |
2142 | "rq_tailsz=%d buflen=%d\n", | |
2143 | rqst->rq_nvec, rqst->rq_npages, rqst->rq_pagesz, | |
2144 | rqst->rq_tailsz, buflen); | |
2145 | ||
2146 | start = i = iov[0].iov_len ? 0 : 1; | |
2147 | buflen = 0; | |
2148 | while (true) { | |
2149 | buflen += iov[i].iov_len; | |
2150 | if (buflen > max_iov_size) { | |
2151 | if (i > start) { | |
2152 | remaining_data_length -= | |
2153 | (buflen-iov[i].iov_len); | |
2154 | log_write(INFO, "sending iov[] from start=%d " | |
2155 | "i=%d nvecs=%d " | |
2156 | "remaining_data_length=%d\n", | |
2157 | start, i, i-start, | |
2158 | remaining_data_length); | |
2159 | rc = smbd_post_send_data( | |
2160 | info, &iov[start], i-start, | |
2161 | remaining_data_length); | |
2162 | if (rc) | |
2163 | goto done; | |
2164 | } else { | |
2165 | /* iov[start] is too big, break it */ | |
2166 | nvecs = (buflen+max_iov_size-1)/max_iov_size; | |
2167 | log_write(INFO, "iov[%d] iov_base=%p buflen=%d" | |
2168 | " break to %d vectors\n", | |
2169 | start, iov[start].iov_base, | |
2170 | buflen, nvecs); | |
2171 | for (j = 0; j < nvecs; j++) { | |
2172 | vec.iov_base = | |
2173 | (char *)iov[start].iov_base + | |
2174 | j*max_iov_size; | |
2175 | vec.iov_len = max_iov_size; | |
2176 | if (j == nvecs-1) | |
2177 | vec.iov_len = | |
2178 | buflen - | |
2179 | max_iov_size*(nvecs-1); | |
2180 | remaining_data_length -= vec.iov_len; | |
2181 | log_write(INFO, | |
2182 | "sending vec j=%d iov_base=%p" | |
2183 | " iov_len=%zu " | |
2184 | "remaining_data_length=%d\n", | |
2185 | j, vec.iov_base, vec.iov_len, | |
2186 | remaining_data_length); | |
2187 | rc = smbd_post_send_data( | |
2188 | info, &vec, 1, | |
2189 | remaining_data_length); | |
2190 | if (rc) | |
2191 | goto done; | |
2192 | } | |
2193 | i++; | |
2194 | } | |
2195 | start = i; | |
2196 | buflen = 0; | |
2197 | } else { | |
2198 | i++; | |
2199 | if (i == rqst->rq_nvec) { | |
2200 | /* send out all remaining vecs */ | |
2201 | remaining_data_length -= buflen; | |
2202 | log_write(INFO, | |
2203 | "sending iov[] from start=%d i=%d " | |
2204 | "nvecs=%d remaining_data_length=%d\n", | |
2205 | start, i, i-start, | |
2206 | remaining_data_length); | |
2207 | rc = smbd_post_send_data(info, &iov[start], | |
2208 | i-start, remaining_data_length); | |
2209 | if (rc) | |
2210 | goto done; | |
2211 | break; | |
2212 | } | |
2213 | } | |
2214 | log_write(INFO, "looping i=%d buflen=%d\n", i, buflen); | |
2215 | } | |
2216 | ||
2217 | /* now sending pages if there are any */ | |
2218 | for (i = 0; i < rqst->rq_npages; i++) { | |
2219 | buflen = (i == rqst->rq_npages-1) ? | |
2220 | rqst->rq_tailsz : rqst->rq_pagesz; | |
2221 | nvecs = (buflen + max_iov_size - 1) / max_iov_size; | |
2222 | log_write(INFO, "sending pages buflen=%d nvecs=%d\n", | |
2223 | buflen, nvecs); | |
2224 | for (j = 0; j < nvecs; j++) { | |
2225 | size = max_iov_size; | |
2226 | if (j == nvecs-1) | |
2227 | size = buflen - j*max_iov_size; | |
2228 | remaining_data_length -= size; | |
2229 | log_write(INFO, "sending pages i=%d offset=%d size=%d" | |
2230 | " remaining_data_length=%d\n", | |
2231 | i, j*max_iov_size, size, remaining_data_length); | |
2232 | rc = smbd_post_send_page( | |
2233 | info, rqst->rq_pages[i], j*max_iov_size, | |
2234 | size, remaining_data_length); | |
2235 | if (rc) | |
2236 | goto done; | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | done: | |
2241 | /* | |
2242 | * As an optimization, we don't wait for individual I/O to finish | |
2243 | * before sending the next one. | |
2244 | * Send them all and wait for pending send count to get to 0 | |
2245 | * that means all the I/Os have been out and we are good to return | |
2246 | */ | |
2247 | ||
2248 | wait_event(info->wait_send_payload_pending, | |
2249 | atomic_read(&info->send_payload_pending) == 0); | |
2250 | ||
2251 | info->smbd_send_pending--; | |
2252 | wake_up(&info->wait_smbd_send_pending); | |
2253 | ||
2254 | return rc; | |
2255 | } | |
c7398583 LL |
2256 | |
2257 | static void register_mr_done(struct ib_cq *cq, struct ib_wc *wc) | |
2258 | { | |
2259 | struct smbd_mr *mr; | |
2260 | struct ib_cqe *cqe; | |
2261 | ||
2262 | if (wc->status) { | |
2263 | log_rdma_mr(ERR, "status=%d\n", wc->status); | |
2264 | cqe = wc->wr_cqe; | |
2265 | mr = container_of(cqe, struct smbd_mr, cqe); | |
2266 | smbd_disconnect_rdma_connection(mr->conn); | |
2267 | } | |
2268 | } | |
2269 | ||
2270 | /* | |
2271 | * The work queue function that recovers MRs | |
2272 | * We need to call ib_dereg_mr() and ib_alloc_mr() before this MR can be used | |
2273 | * again. Both calls are slow, so finish them in a workqueue. This will not | |
2274 | * block I/O path. | |
2275 | * There is one workqueue that recovers MRs, there is no need to lock as the | |
2276 | * I/O requests calling smbd_register_mr will never update the links in the | |
2277 | * mr_list. | |
2278 | */ | |
2279 | static void smbd_mr_recovery_work(struct work_struct *work) | |
2280 | { | |
2281 | struct smbd_connection *info = | |
2282 | container_of(work, struct smbd_connection, mr_recovery_work); | |
2283 | struct smbd_mr *smbdirect_mr; | |
2284 | int rc; | |
2285 | ||
2286 | list_for_each_entry(smbdirect_mr, &info->mr_list, list) { | |
2287 | if (smbdirect_mr->state == MR_INVALIDATED || | |
2288 | smbdirect_mr->state == MR_ERROR) { | |
2289 | ||
2290 | if (smbdirect_mr->state == MR_INVALIDATED) { | |
2291 | ib_dma_unmap_sg( | |
2292 | info->id->device, smbdirect_mr->sgl, | |
2293 | smbdirect_mr->sgl_count, | |
2294 | smbdirect_mr->dir); | |
2295 | smbdirect_mr->state = MR_READY; | |
2296 | } else if (smbdirect_mr->state == MR_ERROR) { | |
2297 | ||
2298 | /* recover this MR entry */ | |
2299 | rc = ib_dereg_mr(smbdirect_mr->mr); | |
2300 | if (rc) { | |
2301 | log_rdma_mr(ERR, | |
ac65cb62 | 2302 | "ib_dereg_mr failed rc=%x\n", |
c7398583 LL |
2303 | rc); |
2304 | smbd_disconnect_rdma_connection(info); | |
2305 | } | |
2306 | ||
2307 | smbdirect_mr->mr = ib_alloc_mr( | |
2308 | info->pd, info->mr_type, | |
2309 | info->max_frmr_depth); | |
2310 | if (IS_ERR(smbdirect_mr->mr)) { | |
2311 | log_rdma_mr(ERR, | |
2312 | "ib_alloc_mr failed mr_type=%x " | |
2313 | "max_frmr_depth=%x\n", | |
2314 | info->mr_type, | |
2315 | info->max_frmr_depth); | |
2316 | smbd_disconnect_rdma_connection(info); | |
2317 | } | |
2318 | ||
2319 | smbdirect_mr->state = MR_READY; | |
2320 | } | |
2321 | /* smbdirect_mr->state is updated by this function | |
2322 | * and is read and updated by I/O issuing CPUs trying | |
2323 | * to get a MR, the call to atomic_inc_return | |
2324 | * implicates a memory barrier and guarantees this | |
2325 | * value is updated before waking up any calls to | |
2326 | * get_mr() from the I/O issuing CPUs | |
2327 | */ | |
2328 | if (atomic_inc_return(&info->mr_ready_count) == 1) | |
2329 | wake_up_interruptible(&info->wait_mr); | |
2330 | } | |
2331 | } | |
2332 | } | |
2333 | ||
2334 | static void destroy_mr_list(struct smbd_connection *info) | |
2335 | { | |
2336 | struct smbd_mr *mr, *tmp; | |
2337 | ||
2338 | cancel_work_sync(&info->mr_recovery_work); | |
2339 | list_for_each_entry_safe(mr, tmp, &info->mr_list, list) { | |
2340 | if (mr->state == MR_INVALIDATED) | |
2341 | ib_dma_unmap_sg(info->id->device, mr->sgl, | |
2342 | mr->sgl_count, mr->dir); | |
2343 | ib_dereg_mr(mr->mr); | |
2344 | kfree(mr->sgl); | |
2345 | kfree(mr); | |
2346 | } | |
2347 | } | |
2348 | ||
2349 | /* | |
2350 | * Allocate MRs used for RDMA read/write | |
2351 | * The number of MRs will not exceed hardware capability in responder_resources | |
2352 | * All MRs are kept in mr_list. The MR can be recovered after it's used | |
2353 | * Recovery is done in smbd_mr_recovery_work. The content of list entry changes | |
2354 | * as MRs are used and recovered for I/O, but the list links will not change | |
2355 | */ | |
2356 | static int allocate_mr_list(struct smbd_connection *info) | |
2357 | { | |
2358 | int i; | |
2359 | struct smbd_mr *smbdirect_mr, *tmp; | |
2360 | ||
2361 | INIT_LIST_HEAD(&info->mr_list); | |
2362 | init_waitqueue_head(&info->wait_mr); | |
2363 | spin_lock_init(&info->mr_list_lock); | |
2364 | atomic_set(&info->mr_ready_count, 0); | |
2365 | atomic_set(&info->mr_used_count, 0); | |
2366 | init_waitqueue_head(&info->wait_for_mr_cleanup); | |
2367 | /* Allocate more MRs (2x) than hardware responder_resources */ | |
2368 | for (i = 0; i < info->responder_resources * 2; i++) { | |
2369 | smbdirect_mr = kzalloc(sizeof(*smbdirect_mr), GFP_KERNEL); | |
2370 | if (!smbdirect_mr) | |
2371 | goto out; | |
2372 | smbdirect_mr->mr = ib_alloc_mr(info->pd, info->mr_type, | |
2373 | info->max_frmr_depth); | |
2374 | if (IS_ERR(smbdirect_mr->mr)) { | |
2375 | log_rdma_mr(ERR, "ib_alloc_mr failed mr_type=%x " | |
2376 | "max_frmr_depth=%x\n", | |
2377 | info->mr_type, info->max_frmr_depth); | |
2378 | goto out; | |
2379 | } | |
2380 | smbdirect_mr->sgl = kcalloc( | |
2381 | info->max_frmr_depth, | |
2382 | sizeof(struct scatterlist), | |
2383 | GFP_KERNEL); | |
2384 | if (!smbdirect_mr->sgl) { | |
2385 | log_rdma_mr(ERR, "failed to allocate sgl\n"); | |
2386 | ib_dereg_mr(smbdirect_mr->mr); | |
2387 | goto out; | |
2388 | } | |
2389 | smbdirect_mr->state = MR_READY; | |
2390 | smbdirect_mr->conn = info; | |
2391 | ||
2392 | list_add_tail(&smbdirect_mr->list, &info->mr_list); | |
2393 | atomic_inc(&info->mr_ready_count); | |
2394 | } | |
2395 | INIT_WORK(&info->mr_recovery_work, smbd_mr_recovery_work); | |
2396 | return 0; | |
2397 | ||
2398 | out: | |
2399 | kfree(smbdirect_mr); | |
2400 | ||
2401 | list_for_each_entry_safe(smbdirect_mr, tmp, &info->mr_list, list) { | |
2402 | ib_dereg_mr(smbdirect_mr->mr); | |
2403 | kfree(smbdirect_mr->sgl); | |
2404 | kfree(smbdirect_mr); | |
2405 | } | |
2406 | return -ENOMEM; | |
2407 | } | |
2408 | ||
2409 | /* | |
2410 | * Get a MR from mr_list. This function waits until there is at least one | |
2411 | * MR available in the list. It may access the list while the | |
2412 | * smbd_mr_recovery_work is recovering the MR list. This doesn't need a lock | |
2413 | * as they never modify the same places. However, there may be several CPUs | |
2414 | * issueing I/O trying to get MR at the same time, mr_list_lock is used to | |
2415 | * protect this situation. | |
2416 | */ | |
2417 | static struct smbd_mr *get_mr(struct smbd_connection *info) | |
2418 | { | |
2419 | struct smbd_mr *ret; | |
2420 | int rc; | |
2421 | again: | |
2422 | rc = wait_event_interruptible(info->wait_mr, | |
2423 | atomic_read(&info->mr_ready_count) || | |
2424 | info->transport_status != SMBD_CONNECTED); | |
2425 | if (rc) { | |
2426 | log_rdma_mr(ERR, "wait_event_interruptible rc=%x\n", rc); | |
2427 | return NULL; | |
2428 | } | |
2429 | ||
2430 | if (info->transport_status != SMBD_CONNECTED) { | |
2431 | log_rdma_mr(ERR, "info->transport_status=%x\n", | |
2432 | info->transport_status); | |
2433 | return NULL; | |
2434 | } | |
2435 | ||
2436 | spin_lock(&info->mr_list_lock); | |
2437 | list_for_each_entry(ret, &info->mr_list, list) { | |
2438 | if (ret->state == MR_READY) { | |
2439 | ret->state = MR_REGISTERED; | |
2440 | spin_unlock(&info->mr_list_lock); | |
2441 | atomic_dec(&info->mr_ready_count); | |
2442 | atomic_inc(&info->mr_used_count); | |
2443 | return ret; | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | spin_unlock(&info->mr_list_lock); | |
2448 | /* | |
2449 | * It is possible that we could fail to get MR because other processes may | |
2450 | * try to acquire a MR at the same time. If this is the case, retry it. | |
2451 | */ | |
2452 | goto again; | |
2453 | } | |
2454 | ||
2455 | /* | |
2456 | * Register memory for RDMA read/write | |
2457 | * pages[]: the list of pages to register memory with | |
2458 | * num_pages: the number of pages to register | |
2459 | * tailsz: if non-zero, the bytes to register in the last page | |
2460 | * writing: true if this is a RDMA write (SMB read), false for RDMA read | |
2461 | * need_invalidate: true if this MR needs to be locally invalidated after I/O | |
2462 | * return value: the MR registered, NULL if failed. | |
2463 | */ | |
2464 | struct smbd_mr *smbd_register_mr( | |
2465 | struct smbd_connection *info, struct page *pages[], int num_pages, | |
2466 | int tailsz, bool writing, bool need_invalidate) | |
2467 | { | |
2468 | struct smbd_mr *smbdirect_mr; | |
2469 | int rc, i; | |
2470 | enum dma_data_direction dir; | |
2471 | struct ib_reg_wr *reg_wr; | |
2472 | struct ib_send_wr *bad_wr; | |
2473 | ||
2474 | if (num_pages > info->max_frmr_depth) { | |
2475 | log_rdma_mr(ERR, "num_pages=%d max_frmr_depth=%d\n", | |
2476 | num_pages, info->max_frmr_depth); | |
2477 | return NULL; | |
2478 | } | |
2479 | ||
2480 | smbdirect_mr = get_mr(info); | |
2481 | if (!smbdirect_mr) { | |
2482 | log_rdma_mr(ERR, "get_mr returning NULL\n"); | |
2483 | return NULL; | |
2484 | } | |
2485 | smbdirect_mr->need_invalidate = need_invalidate; | |
2486 | smbdirect_mr->sgl_count = num_pages; | |
2487 | sg_init_table(smbdirect_mr->sgl, num_pages); | |
2488 | ||
2489 | for (i = 0; i < num_pages - 1; i++) | |
2490 | sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0); | |
2491 | ||
2492 | sg_set_page(&smbdirect_mr->sgl[i], pages[i], | |
2493 | tailsz ? tailsz : PAGE_SIZE, 0); | |
2494 | ||
2495 | dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
2496 | smbdirect_mr->dir = dir; | |
2497 | rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir); | |
2498 | if (!rc) { | |
2499 | log_rdma_mr(INFO, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n", | |
2500 | num_pages, dir, rc); | |
2501 | goto dma_map_error; | |
2502 | } | |
2503 | ||
2504 | rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages, | |
2505 | NULL, PAGE_SIZE); | |
2506 | if (rc != num_pages) { | |
2507 | log_rdma_mr(INFO, | |
2508 | "ib_map_mr_sg failed rc = %x num_pages = %x\n", | |
2509 | rc, num_pages); | |
2510 | goto map_mr_error; | |
2511 | } | |
2512 | ||
2513 | ib_update_fast_reg_key(smbdirect_mr->mr, | |
2514 | ib_inc_rkey(smbdirect_mr->mr->rkey)); | |
2515 | reg_wr = &smbdirect_mr->wr; | |
2516 | reg_wr->wr.opcode = IB_WR_REG_MR; | |
2517 | smbdirect_mr->cqe.done = register_mr_done; | |
2518 | reg_wr->wr.wr_cqe = &smbdirect_mr->cqe; | |
2519 | reg_wr->wr.num_sge = 0; | |
2520 | reg_wr->wr.send_flags = IB_SEND_SIGNALED; | |
2521 | reg_wr->mr = smbdirect_mr->mr; | |
2522 | reg_wr->key = smbdirect_mr->mr->rkey; | |
2523 | reg_wr->access = writing ? | |
2524 | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : | |
2525 | IB_ACCESS_REMOTE_READ; | |
2526 | ||
2527 | /* | |
2528 | * There is no need for waiting for complemtion on ib_post_send | |
2529 | * on IB_WR_REG_MR. Hardware enforces a barrier and order of execution | |
2530 | * on the next ib_post_send when we actaully send I/O to remote peer | |
2531 | */ | |
2532 | rc = ib_post_send(info->id->qp, ®_wr->wr, &bad_wr); | |
2533 | if (!rc) | |
2534 | return smbdirect_mr; | |
2535 | ||
2536 | log_rdma_mr(ERR, "ib_post_send failed rc=%x reg_wr->key=%x\n", | |
2537 | rc, reg_wr->key); | |
2538 | ||
2539 | /* If all failed, attempt to recover this MR by setting it MR_ERROR*/ | |
2540 | map_mr_error: | |
2541 | ib_dma_unmap_sg(info->id->device, smbdirect_mr->sgl, | |
2542 | smbdirect_mr->sgl_count, smbdirect_mr->dir); | |
2543 | ||
2544 | dma_map_error: | |
2545 | smbdirect_mr->state = MR_ERROR; | |
2546 | if (atomic_dec_and_test(&info->mr_used_count)) | |
2547 | wake_up(&info->wait_for_mr_cleanup); | |
2548 | ||
2549 | return NULL; | |
2550 | } | |
2551 | ||
2552 | static void local_inv_done(struct ib_cq *cq, struct ib_wc *wc) | |
2553 | { | |
2554 | struct smbd_mr *smbdirect_mr; | |
2555 | struct ib_cqe *cqe; | |
2556 | ||
2557 | cqe = wc->wr_cqe; | |
2558 | smbdirect_mr = container_of(cqe, struct smbd_mr, cqe); | |
2559 | smbdirect_mr->state = MR_INVALIDATED; | |
2560 | if (wc->status != IB_WC_SUCCESS) { | |
2561 | log_rdma_mr(ERR, "invalidate failed status=%x\n", wc->status); | |
2562 | smbdirect_mr->state = MR_ERROR; | |
2563 | } | |
2564 | complete(&smbdirect_mr->invalidate_done); | |
2565 | } | |
2566 | ||
2567 | /* | |
2568 | * Deregister a MR after I/O is done | |
2569 | * This function may wait if remote invalidation is not used | |
2570 | * and we have to locally invalidate the buffer to prevent data is being | |
2571 | * modified by remote peer after upper layer consumes it | |
2572 | */ | |
2573 | int smbd_deregister_mr(struct smbd_mr *smbdirect_mr) | |
2574 | { | |
2575 | struct ib_send_wr *wr, *bad_wr; | |
2576 | struct smbd_connection *info = smbdirect_mr->conn; | |
2577 | int rc = 0; | |
2578 | ||
2579 | if (smbdirect_mr->need_invalidate) { | |
2580 | /* Need to finish local invalidation before returning */ | |
2581 | wr = &smbdirect_mr->inv_wr; | |
2582 | wr->opcode = IB_WR_LOCAL_INV; | |
2583 | smbdirect_mr->cqe.done = local_inv_done; | |
2584 | wr->wr_cqe = &smbdirect_mr->cqe; | |
2585 | wr->num_sge = 0; | |
2586 | wr->ex.invalidate_rkey = smbdirect_mr->mr->rkey; | |
2587 | wr->send_flags = IB_SEND_SIGNALED; | |
2588 | ||
2589 | init_completion(&smbdirect_mr->invalidate_done); | |
2590 | rc = ib_post_send(info->id->qp, wr, &bad_wr); | |
2591 | if (rc) { | |
2592 | log_rdma_mr(ERR, "ib_post_send failed rc=%x\n", rc); | |
2593 | smbd_disconnect_rdma_connection(info); | |
2594 | goto done; | |
2595 | } | |
2596 | wait_for_completion(&smbdirect_mr->invalidate_done); | |
2597 | smbdirect_mr->need_invalidate = false; | |
2598 | } else | |
2599 | /* | |
2600 | * For remote invalidation, just set it to MR_INVALIDATED | |
2601 | * and defer to mr_recovery_work to recover the MR for next use | |
2602 | */ | |
2603 | smbdirect_mr->state = MR_INVALIDATED; | |
2604 | ||
2605 | /* | |
2606 | * Schedule the work to do MR recovery for future I/Os | |
2607 | * MR recovery is slow and we don't want it to block the current I/O | |
2608 | */ | |
2609 | queue_work(info->workqueue, &info->mr_recovery_work); | |
2610 | ||
2611 | done: | |
2612 | if (atomic_dec_and_test(&info->mr_used_count)) | |
2613 | wake_up(&info->wait_for_mr_cleanup); | |
2614 | ||
2615 | return rc; | |
2616 | } |