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1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Copyright (C) 2017, Microsoft Corporation. | |
4 | * Copyright (C) 2018, LG Electronics. | |
5 | * | |
6 | * Author(s): Long Li <longli@microsoft.com>, | |
7 | * Hyunchul Lee <hyc.lee@gmail.com> | |
0626e664 NJ |
8 | */ |
9 | ||
10 | #define SUBMOD_NAME "smb_direct" | |
11 | ||
12 | #include <linux/kthread.h> | |
0626e664 NJ |
13 | #include <linux/list.h> |
14 | #include <linux/mempool.h> | |
15 | #include <linux/highmem.h> | |
16 | #include <linux/scatterlist.h> | |
17 | #include <rdma/ib_verbs.h> | |
18 | #include <rdma/rdma_cm.h> | |
19 | #include <rdma/rw.h> | |
20 | ||
21 | #include "glob.h" | |
22 | #include "connection.h" | |
23 | #include "smb_common.h" | |
24 | #include "smbstatus.h" | |
0626e664 NJ |
25 | #include "transport_rdma.h" |
26 | ||
cb097b3d NJ |
27 | #define SMB_DIRECT_PORT_IWARP 5445 |
28 | #define SMB_DIRECT_PORT_INFINIBAND 445 | |
0626e664 NJ |
29 | |
30 | #define SMB_DIRECT_VERSION_LE cpu_to_le16(0x0100) | |
31 | ||
32 | /* SMB_DIRECT negotiation timeout in seconds */ | |
33 | #define SMB_DIRECT_NEGOTIATE_TIMEOUT 120 | |
34 | ||
2b4eeeaa | 35 | #define SMB_DIRECT_MAX_SEND_SGES 6 |
0626e664 NJ |
36 | #define SMB_DIRECT_MAX_RECV_SGES 1 |
37 | ||
38 | /* | |
39 | * Default maximum number of RDMA read/write outstanding on this connection | |
40 | * This value is possibly decreased during QP creation on hardware limit | |
41 | */ | |
42 | #define SMB_DIRECT_CM_INITIATOR_DEPTH 8 | |
43 | ||
44 | /* Maximum number of retries on data transfer operations */ | |
45 | #define SMB_DIRECT_CM_RETRY 6 | |
46 | /* No need to retry on Receiver Not Ready since SMB_DIRECT manages credits */ | |
47 | #define SMB_DIRECT_CM_RNR_RETRY 0 | |
48 | ||
49 | /* | |
50 | * User configurable initial values per SMB_DIRECT transport connection | |
92239588 | 51 | * as defined in [MS-SMBD] 3.1.1.1 |
0626e664 NJ |
52 | * Those may change after a SMB_DIRECT negotiation |
53 | */ | |
cb097b3d NJ |
54 | |
55 | /* Set 445 port to SMB Direct port by default */ | |
56 | static int smb_direct_port = SMB_DIRECT_PORT_INFINIBAND; | |
57 | ||
0626e664 NJ |
58 | /* The local peer's maximum number of credits to grant to the peer */ |
59 | static int smb_direct_receive_credit_max = 255; | |
60 | ||
61 | /* The remote peer's credit request of local peer */ | |
62 | static int smb_direct_send_credit_target = 255; | |
63 | ||
64 | /* The maximum single message size can be sent to remote peer */ | |
78af146e | 65 | static int smb_direct_max_send_size = 1364; |
0626e664 NJ |
66 | |
67 | /* The maximum fragmented upper-layer payload receive size supported */ | |
68 | static int smb_direct_max_fragmented_recv_size = 1024 * 1024; | |
69 | ||
70 | /* The maximum single-message size which can be received */ | |
78af146e | 71 | static int smb_direct_max_receive_size = 1364; |
0626e664 | 72 | |
65bb45b9 | 73 | static int smb_direct_max_read_write_size = SMBD_DEFAULT_IOSIZE; |
0626e664 | 74 | |
31928a00 HL |
75 | static LIST_HEAD(smb_direct_device_list); |
76 | static DEFINE_RWLOCK(smb_direct_device_lock); | |
77 | ||
78 | struct smb_direct_device { | |
79 | struct ib_device *ib_dev; | |
80 | struct list_head list; | |
81 | }; | |
82 | ||
0626e664 NJ |
83 | static struct smb_direct_listener { |
84 | struct rdma_cm_id *cm_id; | |
85 | } smb_direct_listener; | |
86 | ||
0626e664 NJ |
87 | static struct workqueue_struct *smb_direct_wq; |
88 | ||
89 | enum smb_direct_status { | |
90 | SMB_DIRECT_CS_NEW = 0, | |
91 | SMB_DIRECT_CS_CONNECTED, | |
92 | SMB_DIRECT_CS_DISCONNECTING, | |
93 | SMB_DIRECT_CS_DISCONNECTED, | |
94 | }; | |
95 | ||
96 | struct smb_direct_transport { | |
97 | struct ksmbd_transport transport; | |
98 | ||
99 | enum smb_direct_status status; | |
100 | bool full_packet_received; | |
101 | wait_queue_head_t wait_status; | |
102 | ||
103 | struct rdma_cm_id *cm_id; | |
104 | struct ib_cq *send_cq; | |
105 | struct ib_cq *recv_cq; | |
106 | struct ib_pd *pd; | |
107 | struct ib_qp *qp; | |
108 | ||
109 | int max_send_size; | |
110 | int max_recv_size; | |
111 | int max_fragmented_send_size; | |
112 | int max_fragmented_recv_size; | |
113 | int max_rdma_rw_size; | |
114 | ||
115 | spinlock_t reassembly_queue_lock; | |
116 | struct list_head reassembly_queue; | |
117 | int reassembly_data_length; | |
118 | int reassembly_queue_length; | |
119 | int first_entry_offset; | |
120 | wait_queue_head_t wait_reassembly_queue; | |
121 | ||
122 | spinlock_t receive_credit_lock; | |
123 | int recv_credits; | |
124 | int count_avail_recvmsg; | |
125 | int recv_credit_max; | |
126 | int recv_credit_target; | |
127 | ||
128 | spinlock_t recvmsg_queue_lock; | |
129 | struct list_head recvmsg_queue; | |
130 | ||
131 | spinlock_t empty_recvmsg_queue_lock; | |
132 | struct list_head empty_recvmsg_queue; | |
133 | ||
134 | int send_credit_target; | |
135 | atomic_t send_credits; | |
136 | spinlock_t lock_new_recv_credits; | |
137 | int new_recv_credits; | |
ddbdc861 HL |
138 | int max_rw_credits; |
139 | int pages_per_rw_credit; | |
140 | atomic_t rw_credits; | |
0626e664 NJ |
141 | |
142 | wait_queue_head_t wait_send_credits; | |
ddbdc861 | 143 | wait_queue_head_t wait_rw_credits; |
0626e664 NJ |
144 | |
145 | mempool_t *sendmsg_mempool; | |
146 | struct kmem_cache *sendmsg_cache; | |
147 | mempool_t *recvmsg_mempool; | |
148 | struct kmem_cache *recvmsg_cache; | |
149 | ||
0626e664 NJ |
150 | wait_queue_head_t wait_send_pending; |
151 | atomic_t send_pending; | |
152 | ||
153 | struct delayed_work post_recv_credits_work; | |
154 | struct work_struct send_immediate_work; | |
155 | struct work_struct disconnect_work; | |
156 | ||
157 | bool negotiation_requested; | |
158 | }; | |
159 | ||
160 | #define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport)) | |
0626e664 NJ |
161 | |
162 | enum { | |
163 | SMB_DIRECT_MSG_NEGOTIATE_REQ = 0, | |
164 | SMB_DIRECT_MSG_DATA_TRANSFER | |
165 | }; | |
166 | ||
167 | static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops; | |
168 | ||
169 | struct smb_direct_send_ctx { | |
170 | struct list_head msg_list; | |
171 | int wr_cnt; | |
172 | bool need_invalidate_rkey; | |
173 | unsigned int remote_key; | |
174 | }; | |
175 | ||
176 | struct smb_direct_sendmsg { | |
177 | struct smb_direct_transport *transport; | |
178 | struct ib_send_wr wr; | |
179 | struct list_head list; | |
180 | int num_sge; | |
181 | struct ib_sge sge[SMB_DIRECT_MAX_SEND_SGES]; | |
182 | struct ib_cqe cqe; | |
183 | u8 packet[]; | |
184 | }; | |
185 | ||
186 | struct smb_direct_recvmsg { | |
187 | struct smb_direct_transport *transport; | |
188 | struct list_head list; | |
189 | int type; | |
190 | struct ib_sge sge; | |
191 | struct ib_cqe cqe; | |
192 | bool first_segment; | |
193 | u8 packet[]; | |
194 | }; | |
195 | ||
196 | struct smb_direct_rdma_rw_msg { | |
197 | struct smb_direct_transport *t; | |
198 | struct ib_cqe cqe; | |
ee1b0558 | 199 | int status; |
0626e664 | 200 | struct completion *completion; |
ee1b0558 | 201 | struct list_head list; |
0626e664 NJ |
202 | struct rdma_rw_ctx rw_ctx; |
203 | struct sg_table sgt; | |
5224f790 | 204 | struct scatterlist sg_list[]; |
0626e664 NJ |
205 | }; |
206 | ||
65bb45b9 NJ |
207 | void init_smbd_max_io_size(unsigned int sz) |
208 | { | |
209 | sz = clamp_val(sz, SMBD_MIN_IOSIZE, SMBD_MAX_IOSIZE); | |
210 | smb_direct_max_read_write_size = sz; | |
211 | } | |
212 | ||
7a84399e NJ |
213 | unsigned int get_smbd_max_read_write_size(void) |
214 | { | |
215 | return smb_direct_max_read_write_size; | |
216 | } | |
217 | ||
8ad8dc34 HL |
218 | static inline int get_buf_page_count(void *buf, int size) |
219 | { | |
220 | return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) - | |
221 | (uintptr_t)buf / PAGE_SIZE; | |
222 | } | |
0626e664 NJ |
223 | |
224 | static void smb_direct_destroy_pools(struct smb_direct_transport *transport); | |
225 | static void smb_direct_post_recv_credits(struct work_struct *work); | |
226 | static int smb_direct_post_send_data(struct smb_direct_transport *t, | |
070fb21e NJ |
227 | struct smb_direct_send_ctx *send_ctx, |
228 | struct kvec *iov, int niov, | |
229 | int remaining_data_length); | |
0626e664 | 230 | |
02d4b4aa NJ |
231 | static inline struct smb_direct_transport * |
232 | smb_trans_direct_transfort(struct ksmbd_transport *t) | |
233 | { | |
234 | return container_of(t, struct smb_direct_transport, transport); | |
235 | } | |
236 | ||
0626e664 NJ |
237 | static inline void |
238 | *smb_direct_recvmsg_payload(struct smb_direct_recvmsg *recvmsg) | |
239 | { | |
240 | return (void *)recvmsg->packet; | |
241 | } | |
242 | ||
243 | static inline bool is_receive_credit_post_required(int receive_credits, | |
070fb21e | 244 | int avail_recvmsg_count) |
0626e664 NJ |
245 | { |
246 | return receive_credits <= (smb_direct_receive_credit_max >> 3) && | |
247 | avail_recvmsg_count >= (receive_credits >> 2); | |
248 | } | |
249 | ||
250 | static struct | |
251 | smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t) | |
252 | { | |
253 | struct smb_direct_recvmsg *recvmsg = NULL; | |
254 | ||
255 | spin_lock(&t->recvmsg_queue_lock); | |
256 | if (!list_empty(&t->recvmsg_queue)) { | |
257 | recvmsg = list_first_entry(&t->recvmsg_queue, | |
258 | struct smb_direct_recvmsg, | |
259 | list); | |
260 | list_del(&recvmsg->list); | |
261 | } | |
262 | spin_unlock(&t->recvmsg_queue_lock); | |
263 | return recvmsg; | |
264 | } | |
265 | ||
266 | static void put_recvmsg(struct smb_direct_transport *t, | |
070fb21e | 267 | struct smb_direct_recvmsg *recvmsg) |
0626e664 NJ |
268 | { |
269 | ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, | |
070fb21e | 270 | recvmsg->sge.length, DMA_FROM_DEVICE); |
0626e664 NJ |
271 | |
272 | spin_lock(&t->recvmsg_queue_lock); | |
273 | list_add(&recvmsg->list, &t->recvmsg_queue); | |
274 | spin_unlock(&t->recvmsg_queue_lock); | |
0626e664 NJ |
275 | } |
276 | ||
277 | static struct | |
278 | smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t) | |
279 | { | |
280 | struct smb_direct_recvmsg *recvmsg = NULL; | |
281 | ||
282 | spin_lock(&t->empty_recvmsg_queue_lock); | |
283 | if (!list_empty(&t->empty_recvmsg_queue)) { | |
64b39f4a | 284 | recvmsg = list_first_entry(&t->empty_recvmsg_queue, |
070fb21e | 285 | struct smb_direct_recvmsg, list); |
0626e664 NJ |
286 | list_del(&recvmsg->list); |
287 | } | |
288 | spin_unlock(&t->empty_recvmsg_queue_lock); | |
289 | return recvmsg; | |
290 | } | |
291 | ||
292 | static void put_empty_recvmsg(struct smb_direct_transport *t, | |
070fb21e | 293 | struct smb_direct_recvmsg *recvmsg) |
0626e664 NJ |
294 | { |
295 | ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr, | |
070fb21e | 296 | recvmsg->sge.length, DMA_FROM_DEVICE); |
0626e664 NJ |
297 | |
298 | spin_lock(&t->empty_recvmsg_queue_lock); | |
299 | list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue); | |
300 | spin_unlock(&t->empty_recvmsg_queue_lock); | |
301 | } | |
302 | ||
303 | static void enqueue_reassembly(struct smb_direct_transport *t, | |
070fb21e NJ |
304 | struct smb_direct_recvmsg *recvmsg, |
305 | int data_length) | |
0626e664 NJ |
306 | { |
307 | spin_lock(&t->reassembly_queue_lock); | |
308 | list_add_tail(&recvmsg->list, &t->reassembly_queue); | |
309 | t->reassembly_queue_length++; | |
310 | /* | |
311 | * Make sure reassembly_data_length is updated after list and | |
312 | * reassembly_queue_length are updated. On the dequeue side | |
313 | * reassembly_data_length is checked without a lock to determine | |
314 | * if reassembly_queue_length and list is up to date | |
315 | */ | |
316 | virt_wmb(); | |
317 | t->reassembly_data_length += data_length; | |
318 | spin_unlock(&t->reassembly_queue_lock); | |
0626e664 NJ |
319 | } |
320 | ||
64b39f4a | 321 | static struct smb_direct_recvmsg *get_first_reassembly(struct smb_direct_transport *t) |
0626e664 NJ |
322 | { |
323 | if (!list_empty(&t->reassembly_queue)) | |
324 | return list_first_entry(&t->reassembly_queue, | |
325 | struct smb_direct_recvmsg, list); | |
326 | else | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | static void smb_direct_disconnect_rdma_work(struct work_struct *work) | |
331 | { | |
332 | struct smb_direct_transport *t = | |
333 | container_of(work, struct smb_direct_transport, | |
334 | disconnect_work); | |
335 | ||
336 | if (t->status == SMB_DIRECT_CS_CONNECTED) { | |
337 | t->status = SMB_DIRECT_CS_DISCONNECTING; | |
338 | rdma_disconnect(t->cm_id); | |
339 | } | |
340 | } | |
341 | ||
342 | static void | |
343 | smb_direct_disconnect_rdma_connection(struct smb_direct_transport *t) | |
344 | { | |
323b1ea1 HL |
345 | if (t->status == SMB_DIRECT_CS_CONNECTED) |
346 | queue_work(smb_direct_wq, &t->disconnect_work); | |
0626e664 NJ |
347 | } |
348 | ||
349 | static void smb_direct_send_immediate_work(struct work_struct *work) | |
350 | { | |
351 | struct smb_direct_transport *t = container_of(work, | |
352 | struct smb_direct_transport, send_immediate_work); | |
353 | ||
354 | if (t->status != SMB_DIRECT_CS_CONNECTED) | |
355 | return; | |
356 | ||
357 | smb_direct_post_send_data(t, NULL, NULL, 0, 0); | |
358 | } | |
359 | ||
360 | static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id) | |
361 | { | |
362 | struct smb_direct_transport *t; | |
363 | struct ksmbd_conn *conn; | |
364 | ||
365 | t = kzalloc(sizeof(*t), GFP_KERNEL); | |
366 | if (!t) | |
367 | return NULL; | |
368 | ||
369 | t->cm_id = cm_id; | |
370 | cm_id->context = t; | |
371 | ||
372 | t->status = SMB_DIRECT_CS_NEW; | |
373 | init_waitqueue_head(&t->wait_status); | |
374 | ||
375 | spin_lock_init(&t->reassembly_queue_lock); | |
376 | INIT_LIST_HEAD(&t->reassembly_queue); | |
377 | t->reassembly_data_length = 0; | |
378 | t->reassembly_queue_length = 0; | |
379 | init_waitqueue_head(&t->wait_reassembly_queue); | |
380 | init_waitqueue_head(&t->wait_send_credits); | |
ddbdc861 | 381 | init_waitqueue_head(&t->wait_rw_credits); |
0626e664 NJ |
382 | |
383 | spin_lock_init(&t->receive_credit_lock); | |
384 | spin_lock_init(&t->recvmsg_queue_lock); | |
385 | INIT_LIST_HEAD(&t->recvmsg_queue); | |
386 | ||
387 | spin_lock_init(&t->empty_recvmsg_queue_lock); | |
388 | INIT_LIST_HEAD(&t->empty_recvmsg_queue); | |
389 | ||
0626e664 NJ |
390 | init_waitqueue_head(&t->wait_send_pending); |
391 | atomic_set(&t->send_pending, 0); | |
392 | ||
393 | spin_lock_init(&t->lock_new_recv_credits); | |
394 | ||
395 | INIT_DELAYED_WORK(&t->post_recv_credits_work, | |
396 | smb_direct_post_recv_credits); | |
397 | INIT_WORK(&t->send_immediate_work, smb_direct_send_immediate_work); | |
398 | INIT_WORK(&t->disconnect_work, smb_direct_disconnect_rdma_work); | |
399 | ||
400 | conn = ksmbd_conn_alloc(); | |
401 | if (!conn) | |
402 | goto err; | |
403 | conn->transport = KSMBD_TRANS(t); | |
404 | KSMBD_TRANS(t)->conn = conn; | |
405 | KSMBD_TRANS(t)->ops = &ksmbd_smb_direct_transport_ops; | |
406 | return t; | |
407 | err: | |
408 | kfree(t); | |
409 | return NULL; | |
410 | } | |
411 | ||
412 | static void free_transport(struct smb_direct_transport *t) | |
413 | { | |
414 | struct smb_direct_recvmsg *recvmsg; | |
415 | ||
416 | wake_up_interruptible(&t->wait_send_credits); | |
417 | ||
418 | ksmbd_debug(RDMA, "wait for all send posted to IB to finish\n"); | |
0626e664 | 419 | wait_event(t->wait_send_pending, |
070fb21e | 420 | atomic_read(&t->send_pending) == 0); |
0626e664 NJ |
421 | |
422 | cancel_work_sync(&t->disconnect_work); | |
423 | cancel_delayed_work_sync(&t->post_recv_credits_work); | |
424 | cancel_work_sync(&t->send_immediate_work); | |
425 | ||
426 | if (t->qp) { | |
427 | ib_drain_qp(t->qp); | |
c9f18927 | 428 | ib_mr_pool_destroy(t->qp, &t->qp->rdma_mrs); |
0626e664 NJ |
429 | ib_destroy_qp(t->qp); |
430 | } | |
431 | ||
432 | ksmbd_debug(RDMA, "drain the reassembly queue\n"); | |
433 | do { | |
434 | spin_lock(&t->reassembly_queue_lock); | |
435 | recvmsg = get_first_reassembly(t); | |
436 | if (recvmsg) { | |
437 | list_del(&recvmsg->list); | |
64b39f4a | 438 | spin_unlock(&t->reassembly_queue_lock); |
0626e664 | 439 | put_recvmsg(t, recvmsg); |
64b39f4a | 440 | } else { |
0626e664 | 441 | spin_unlock(&t->reassembly_queue_lock); |
64b39f4a | 442 | } |
0626e664 NJ |
443 | } while (recvmsg); |
444 | t->reassembly_data_length = 0; | |
445 | ||
446 | if (t->send_cq) | |
447 | ib_free_cq(t->send_cq); | |
448 | if (t->recv_cq) | |
449 | ib_free_cq(t->recv_cq); | |
450 | if (t->pd) | |
451 | ib_dealloc_pd(t->pd); | |
452 | if (t->cm_id) | |
453 | rdma_destroy_id(t->cm_id); | |
454 | ||
455 | smb_direct_destroy_pools(t); | |
456 | ksmbd_conn_free(KSMBD_TRANS(t)->conn); | |
457 | kfree(t); | |
458 | } | |
459 | ||
460 | static struct smb_direct_sendmsg | |
461 | *smb_direct_alloc_sendmsg(struct smb_direct_transport *t) | |
462 | { | |
463 | struct smb_direct_sendmsg *msg; | |
464 | ||
465 | msg = mempool_alloc(t->sendmsg_mempool, GFP_KERNEL); | |
466 | if (!msg) | |
467 | return ERR_PTR(-ENOMEM); | |
468 | msg->transport = t; | |
469 | INIT_LIST_HEAD(&msg->list); | |
470 | msg->num_sge = 0; | |
471 | return msg; | |
472 | } | |
473 | ||
474 | static void smb_direct_free_sendmsg(struct smb_direct_transport *t, | |
070fb21e | 475 | struct smb_direct_sendmsg *msg) |
0626e664 NJ |
476 | { |
477 | int i; | |
478 | ||
479 | if (msg->num_sge > 0) { | |
480 | ib_dma_unmap_single(t->cm_id->device, | |
070fb21e NJ |
481 | msg->sge[0].addr, msg->sge[0].length, |
482 | DMA_TO_DEVICE); | |
0626e664 NJ |
483 | for (i = 1; i < msg->num_sge; i++) |
484 | ib_dma_unmap_page(t->cm_id->device, | |
070fb21e NJ |
485 | msg->sge[i].addr, msg->sge[i].length, |
486 | DMA_TO_DEVICE); | |
0626e664 NJ |
487 | } |
488 | mempool_free(msg, t->sendmsg_mempool); | |
489 | } | |
490 | ||
491 | static int smb_direct_check_recvmsg(struct smb_direct_recvmsg *recvmsg) | |
492 | { | |
493 | switch (recvmsg->type) { | |
494 | case SMB_DIRECT_MSG_DATA_TRANSFER: { | |
495 | struct smb_direct_data_transfer *req = | |
64b39f4a NJ |
496 | (struct smb_direct_data_transfer *)recvmsg->packet; |
497 | struct smb2_hdr *hdr = (struct smb2_hdr *)(recvmsg->packet | |
cb451720 | 498 | + le32_to_cpu(req->data_offset)); |
0626e664 | 499 | ksmbd_debug(RDMA, |
070fb21e NJ |
500 | "CreditGranted: %u, CreditRequested: %u, DataLength: %u, RemainingDataLength: %u, SMB: %x, Command: %u\n", |
501 | le16_to_cpu(req->credits_granted), | |
502 | le16_to_cpu(req->credits_requested), | |
503 | req->data_length, req->remaining_data_length, | |
504 | hdr->ProtocolId, hdr->Command); | |
0626e664 NJ |
505 | break; |
506 | } | |
507 | case SMB_DIRECT_MSG_NEGOTIATE_REQ: { | |
508 | struct smb_direct_negotiate_req *req = | |
509 | (struct smb_direct_negotiate_req *)recvmsg->packet; | |
510 | ksmbd_debug(RDMA, | |
070fb21e NJ |
511 | "MinVersion: %u, MaxVersion: %u, CreditRequested: %u, MaxSendSize: %u, MaxRecvSize: %u, MaxFragmentedSize: %u\n", |
512 | le16_to_cpu(req->min_version), | |
513 | le16_to_cpu(req->max_version), | |
514 | le16_to_cpu(req->credits_requested), | |
515 | le32_to_cpu(req->preferred_send_size), | |
516 | le32_to_cpu(req->max_receive_size), | |
517 | le32_to_cpu(req->max_fragmented_size)); | |
0626e664 | 518 | if (le16_to_cpu(req->min_version) > 0x0100 || |
64b39f4a | 519 | le16_to_cpu(req->max_version) < 0x0100) |
0626e664 NJ |
520 | return -EOPNOTSUPP; |
521 | if (le16_to_cpu(req->credits_requested) <= 0 || | |
64b39f4a NJ |
522 | le32_to_cpu(req->max_receive_size) <= 128 || |
523 | le32_to_cpu(req->max_fragmented_size) <= | |
524 | 128 * 1024) | |
0626e664 NJ |
525 | return -ECONNABORTED; |
526 | ||
527 | break; | |
528 | } | |
529 | default: | |
530 | return -EINVAL; | |
531 | } | |
532 | return 0; | |
533 | } | |
534 | ||
535 | static void recv_done(struct ib_cq *cq, struct ib_wc *wc) | |
536 | { | |
537 | struct smb_direct_recvmsg *recvmsg; | |
538 | struct smb_direct_transport *t; | |
539 | ||
540 | recvmsg = container_of(wc->wr_cqe, struct smb_direct_recvmsg, cqe); | |
541 | t = recvmsg->transport; | |
542 | ||
543 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) { | |
544 | if (wc->status != IB_WC_WR_FLUSH_ERR) { | |
bde1694a NJ |
545 | pr_err("Recv error. status='%s (%d)' opcode=%d\n", |
546 | ib_wc_status_msg(wc->status), wc->status, | |
547 | wc->opcode); | |
0626e664 NJ |
548 | smb_direct_disconnect_rdma_connection(t); |
549 | } | |
550 | put_empty_recvmsg(t, recvmsg); | |
551 | return; | |
552 | } | |
553 | ||
554 | ksmbd_debug(RDMA, "Recv completed. status='%s (%d)', opcode=%d\n", | |
070fb21e NJ |
555 | ib_wc_status_msg(wc->status), wc->status, |
556 | wc->opcode); | |
0626e664 NJ |
557 | |
558 | ib_dma_sync_single_for_cpu(wc->qp->device, recvmsg->sge.addr, | |
070fb21e | 559 | recvmsg->sge.length, DMA_FROM_DEVICE); |
0626e664 NJ |
560 | |
561 | switch (recvmsg->type) { | |
562 | case SMB_DIRECT_MSG_NEGOTIATE_REQ: | |
2ea086e3 HL |
563 | if (wc->byte_len < sizeof(struct smb_direct_negotiate_req)) { |
564 | put_empty_recvmsg(t, recvmsg); | |
565 | return; | |
566 | } | |
0626e664 NJ |
567 | t->negotiation_requested = true; |
568 | t->full_packet_received = true; | |
5366afc4 | 569 | t->status = SMB_DIRECT_CS_CONNECTED; |
99b7650a | 570 | enqueue_reassembly(t, recvmsg, 0); |
0626e664 NJ |
571 | wake_up_interruptible(&t->wait_status); |
572 | break; | |
573 | case SMB_DIRECT_MSG_DATA_TRANSFER: { | |
574 | struct smb_direct_data_transfer *data_transfer = | |
575 | (struct smb_direct_data_transfer *)recvmsg->packet; | |
2ea086e3 | 576 | unsigned int data_length; |
0626e664 NJ |
577 | int avail_recvmsg_count, receive_credits; |
578 | ||
2ea086e3 HL |
579 | if (wc->byte_len < |
580 | offsetof(struct smb_direct_data_transfer, padding)) { | |
581 | put_empty_recvmsg(t, recvmsg); | |
582 | return; | |
583 | } | |
584 | ||
585 | data_length = le32_to_cpu(data_transfer->data_length); | |
0626e664 | 586 | if (data_length) { |
2ea086e3 HL |
587 | if (wc->byte_len < sizeof(struct smb_direct_data_transfer) + |
588 | (u64)data_length) { | |
589 | put_empty_recvmsg(t, recvmsg); | |
590 | return; | |
591 | } | |
592 | ||
0626e664 NJ |
593 | if (t->full_packet_received) |
594 | recvmsg->first_segment = true; | |
595 | ||
596 | if (le32_to_cpu(data_transfer->remaining_data_length)) | |
597 | t->full_packet_received = false; | |
598 | else | |
599 | t->full_packet_received = true; | |
600 | ||
2ea086e3 | 601 | enqueue_reassembly(t, recvmsg, (int)data_length); |
0626e664 NJ |
602 | wake_up_interruptible(&t->wait_reassembly_queue); |
603 | ||
604 | spin_lock(&t->receive_credit_lock); | |
605 | receive_credits = --(t->recv_credits); | |
606 | avail_recvmsg_count = t->count_avail_recvmsg; | |
607 | spin_unlock(&t->receive_credit_lock); | |
608 | } else { | |
609 | put_empty_recvmsg(t, recvmsg); | |
610 | ||
611 | spin_lock(&t->receive_credit_lock); | |
612 | receive_credits = --(t->recv_credits); | |
613 | avail_recvmsg_count = ++(t->count_avail_recvmsg); | |
614 | spin_unlock(&t->receive_credit_lock); | |
615 | } | |
616 | ||
617 | t->recv_credit_target = | |
618 | le16_to_cpu(data_transfer->credits_requested); | |
619 | atomic_add(le16_to_cpu(data_transfer->credits_granted), | |
070fb21e | 620 | &t->send_credits); |
0626e664 NJ |
621 | |
622 | if (le16_to_cpu(data_transfer->flags) & | |
070fb21e | 623 | SMB_DIRECT_RESPONSE_REQUESTED) |
0626e664 NJ |
624 | queue_work(smb_direct_wq, &t->send_immediate_work); |
625 | ||
626 | if (atomic_read(&t->send_credits) > 0) | |
627 | wake_up_interruptible(&t->wait_send_credits); | |
628 | ||
64b39f4a | 629 | if (is_receive_credit_post_required(receive_credits, avail_recvmsg_count)) |
0626e664 | 630 | mod_delayed_work(smb_direct_wq, |
070fb21e | 631 | &t->post_recv_credits_work, 0); |
0626e664 NJ |
632 | break; |
633 | } | |
634 | default: | |
635 | break; | |
636 | } | |
637 | } | |
638 | ||
639 | static int smb_direct_post_recv(struct smb_direct_transport *t, | |
070fb21e | 640 | struct smb_direct_recvmsg *recvmsg) |
0626e664 NJ |
641 | { |
642 | struct ib_recv_wr wr; | |
643 | int ret; | |
644 | ||
645 | recvmsg->sge.addr = ib_dma_map_single(t->cm_id->device, | |
070fb21e NJ |
646 | recvmsg->packet, t->max_recv_size, |
647 | DMA_FROM_DEVICE); | |
0626e664 NJ |
648 | ret = ib_dma_mapping_error(t->cm_id->device, recvmsg->sge.addr); |
649 | if (ret) | |
650 | return ret; | |
651 | recvmsg->sge.length = t->max_recv_size; | |
652 | recvmsg->sge.lkey = t->pd->local_dma_lkey; | |
653 | recvmsg->cqe.done = recv_done; | |
654 | ||
655 | wr.wr_cqe = &recvmsg->cqe; | |
656 | wr.next = NULL; | |
657 | wr.sg_list = &recvmsg->sge; | |
658 | wr.num_sge = 1; | |
659 | ||
660 | ret = ib_post_recv(t->qp, &wr, NULL); | |
661 | if (ret) { | |
bde1694a | 662 | pr_err("Can't post recv: %d\n", ret); |
0626e664 | 663 | ib_dma_unmap_single(t->cm_id->device, |
070fb21e NJ |
664 | recvmsg->sge.addr, recvmsg->sge.length, |
665 | DMA_FROM_DEVICE); | |
0626e664 NJ |
666 | smb_direct_disconnect_rdma_connection(t); |
667 | return ret; | |
668 | } | |
669 | return ret; | |
670 | } | |
671 | ||
672 | static int smb_direct_read(struct ksmbd_transport *t, char *buf, | |
070fb21e | 673 | unsigned int size) |
0626e664 NJ |
674 | { |
675 | struct smb_direct_recvmsg *recvmsg; | |
676 | struct smb_direct_data_transfer *data_transfer; | |
677 | int to_copy, to_read, data_read, offset; | |
678 | u32 data_length, remaining_data_length, data_offset; | |
679 | int rc; | |
02d4b4aa | 680 | struct smb_direct_transport *st = smb_trans_direct_transfort(t); |
0626e664 NJ |
681 | |
682 | again: | |
683 | if (st->status != SMB_DIRECT_CS_CONNECTED) { | |
bde1694a | 684 | pr_err("disconnected\n"); |
0626e664 NJ |
685 | return -ENOTCONN; |
686 | } | |
687 | ||
688 | /* | |
689 | * No need to hold the reassembly queue lock all the time as we are | |
690 | * the only one reading from the front of the queue. The transport | |
691 | * may add more entries to the back of the queue at the same time | |
692 | */ | |
693 | if (st->reassembly_data_length >= size) { | |
694 | int queue_length; | |
695 | int queue_removed = 0; | |
696 | ||
697 | /* | |
698 | * Need to make sure reassembly_data_length is read before | |
699 | * reading reassembly_queue_length and calling | |
700 | * get_first_reassembly. This call is lock free | |
701 | * as we never read at the end of the queue which are being | |
702 | * updated in SOFTIRQ as more data is received | |
703 | */ | |
704 | virt_rmb(); | |
705 | queue_length = st->reassembly_queue_length; | |
706 | data_read = 0; | |
707 | to_read = size; | |
708 | offset = st->first_entry_offset; | |
709 | while (data_read < size) { | |
710 | recvmsg = get_first_reassembly(st); | |
711 | data_transfer = smb_direct_recvmsg_payload(recvmsg); | |
712 | data_length = le32_to_cpu(data_transfer->data_length); | |
713 | remaining_data_length = | |
64b39f4a | 714 | le32_to_cpu(data_transfer->remaining_data_length); |
0626e664 NJ |
715 | data_offset = le32_to_cpu(data_transfer->data_offset); |
716 | ||
717 | /* | |
718 | * The upper layer expects RFC1002 length at the | |
719 | * beginning of the payload. Return it to indicate | |
720 | * the total length of the packet. This minimize the | |
721 | * change to upper layer packet processing logic. This | |
722 | * will be eventually remove when an intermediate | |
723 | * transport layer is added | |
724 | */ | |
725 | if (recvmsg->first_segment && size == 4) { | |
726 | unsigned int rfc1002_len = | |
727 | data_length + remaining_data_length; | |
728 | *((__be32 *)buf) = cpu_to_be32(rfc1002_len); | |
729 | data_read = 4; | |
730 | recvmsg->first_segment = false; | |
731 | ksmbd_debug(RDMA, | |
070fb21e NJ |
732 | "returning rfc1002 length %d\n", |
733 | rfc1002_len); | |
0626e664 NJ |
734 | goto read_rfc1002_done; |
735 | } | |
736 | ||
737 | to_copy = min_t(int, data_length - offset, to_read); | |
64b39f4a | 738 | memcpy(buf + data_read, (char *)data_transfer + data_offset + offset, |
070fb21e | 739 | to_copy); |
0626e664 NJ |
740 | |
741 | /* move on to the next buffer? */ | |
742 | if (to_copy == data_length - offset) { | |
743 | queue_length--; | |
744 | /* | |
745 | * No need to lock if we are not at the | |
746 | * end of the queue | |
747 | */ | |
64b39f4a | 748 | if (queue_length) { |
0626e664 | 749 | list_del(&recvmsg->list); |
64b39f4a NJ |
750 | } else { |
751 | spin_lock_irq(&st->reassembly_queue_lock); | |
0626e664 | 752 | list_del(&recvmsg->list); |
64b39f4a | 753 | spin_unlock_irq(&st->reassembly_queue_lock); |
0626e664 NJ |
754 | } |
755 | queue_removed++; | |
756 | put_recvmsg(st, recvmsg); | |
757 | offset = 0; | |
64b39f4a | 758 | } else { |
0626e664 | 759 | offset += to_copy; |
64b39f4a | 760 | } |
0626e664 NJ |
761 | |
762 | to_read -= to_copy; | |
763 | data_read += to_copy; | |
764 | } | |
765 | ||
766 | spin_lock_irq(&st->reassembly_queue_lock); | |
767 | st->reassembly_data_length -= data_read; | |
768 | st->reassembly_queue_length -= queue_removed; | |
769 | spin_unlock_irq(&st->reassembly_queue_lock); | |
770 | ||
771 | spin_lock(&st->receive_credit_lock); | |
772 | st->count_avail_recvmsg += queue_removed; | |
64b39f4a | 773 | if (is_receive_credit_post_required(st->recv_credits, st->count_avail_recvmsg)) { |
0626e664 NJ |
774 | spin_unlock(&st->receive_credit_lock); |
775 | mod_delayed_work(smb_direct_wq, | |
070fb21e | 776 | &st->post_recv_credits_work, 0); |
64b39f4a | 777 | } else { |
0626e664 | 778 | spin_unlock(&st->receive_credit_lock); |
64b39f4a | 779 | } |
0626e664 NJ |
780 | |
781 | st->first_entry_offset = offset; | |
782 | ksmbd_debug(RDMA, | |
070fb21e NJ |
783 | "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n", |
784 | data_read, st->reassembly_data_length, | |
785 | st->first_entry_offset); | |
0626e664 NJ |
786 | read_rfc1002_done: |
787 | return data_read; | |
788 | } | |
789 | ||
790 | ksmbd_debug(RDMA, "wait_event on more data\n"); | |
64b39f4a | 791 | rc = wait_event_interruptible(st->wait_reassembly_queue, |
070fb21e NJ |
792 | st->reassembly_data_length >= size || |
793 | st->status != SMB_DIRECT_CS_CONNECTED); | |
0626e664 NJ |
794 | if (rc) |
795 | return -EINTR; | |
796 | ||
797 | goto again; | |
798 | } | |
799 | ||
800 | static void smb_direct_post_recv_credits(struct work_struct *work) | |
801 | { | |
802 | struct smb_direct_transport *t = container_of(work, | |
803 | struct smb_direct_transport, post_recv_credits_work.work); | |
804 | struct smb_direct_recvmsg *recvmsg; | |
805 | int receive_credits, credits = 0; | |
806 | int ret; | |
807 | int use_free = 1; | |
808 | ||
809 | spin_lock(&t->receive_credit_lock); | |
810 | receive_credits = t->recv_credits; | |
811 | spin_unlock(&t->receive_credit_lock); | |
812 | ||
813 | if (receive_credits < t->recv_credit_target) { | |
814 | while (true) { | |
815 | if (use_free) | |
816 | recvmsg = get_free_recvmsg(t); | |
817 | else | |
818 | recvmsg = get_empty_recvmsg(t); | |
819 | if (!recvmsg) { | |
820 | if (use_free) { | |
821 | use_free = 0; | |
822 | continue; | |
64b39f4a | 823 | } else { |
0626e664 | 824 | break; |
64b39f4a | 825 | } |
0626e664 NJ |
826 | } |
827 | ||
828 | recvmsg->type = SMB_DIRECT_MSG_DATA_TRANSFER; | |
829 | recvmsg->first_segment = false; | |
830 | ||
831 | ret = smb_direct_post_recv(t, recvmsg); | |
832 | if (ret) { | |
bde1694a | 833 | pr_err("Can't post recv: %d\n", ret); |
0626e664 NJ |
834 | put_recvmsg(t, recvmsg); |
835 | break; | |
836 | } | |
837 | credits++; | |
838 | } | |
839 | } | |
840 | ||
841 | spin_lock(&t->receive_credit_lock); | |
842 | t->recv_credits += credits; | |
843 | t->count_avail_recvmsg -= credits; | |
844 | spin_unlock(&t->receive_credit_lock); | |
845 | ||
846 | spin_lock(&t->lock_new_recv_credits); | |
847 | t->new_recv_credits += credits; | |
848 | spin_unlock(&t->lock_new_recv_credits); | |
849 | ||
850 | if (credits) | |
851 | queue_work(smb_direct_wq, &t->send_immediate_work); | |
852 | } | |
853 | ||
854 | static void send_done(struct ib_cq *cq, struct ib_wc *wc) | |
855 | { | |
856 | struct smb_direct_sendmsg *sendmsg, *sibling; | |
857 | struct smb_direct_transport *t; | |
858 | struct list_head *pos, *prev, *end; | |
859 | ||
860 | sendmsg = container_of(wc->wr_cqe, struct smb_direct_sendmsg, cqe); | |
861 | t = sendmsg->transport; | |
862 | ||
863 | ksmbd_debug(RDMA, "Send completed. status='%s (%d)', opcode=%d\n", | |
070fb21e NJ |
864 | ib_wc_status_msg(wc->status), wc->status, |
865 | wc->opcode); | |
0626e664 NJ |
866 | |
867 | if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) { | |
bde1694a NJ |
868 | pr_err("Send error. status='%s (%d)', opcode=%d\n", |
869 | ib_wc_status_msg(wc->status), wc->status, | |
870 | wc->opcode); | |
0626e664 NJ |
871 | smb_direct_disconnect_rdma_connection(t); |
872 | } | |
873 | ||
11659a8d HL |
874 | if (atomic_dec_and_test(&t->send_pending)) |
875 | wake_up(&t->wait_send_pending); | |
0626e664 NJ |
876 | |
877 | /* iterate and free the list of messages in reverse. the list's head | |
878 | * is invalid. | |
879 | */ | |
880 | for (pos = &sendmsg->list, prev = pos->prev, end = sendmsg->list.next; | |
070fb21e | 881 | prev != end; pos = prev, prev = prev->prev) { |
0626e664 NJ |
882 | sibling = container_of(pos, struct smb_direct_sendmsg, list); |
883 | smb_direct_free_sendmsg(t, sibling); | |
884 | } | |
885 | ||
886 | sibling = container_of(pos, struct smb_direct_sendmsg, list); | |
887 | smb_direct_free_sendmsg(t, sibling); | |
888 | } | |
889 | ||
890 | static int manage_credits_prior_sending(struct smb_direct_transport *t) | |
891 | { | |
892 | int new_credits; | |
893 | ||
894 | spin_lock(&t->lock_new_recv_credits); | |
895 | new_credits = t->new_recv_credits; | |
896 | t->new_recv_credits = 0; | |
897 | spin_unlock(&t->lock_new_recv_credits); | |
898 | ||
899 | return new_credits; | |
900 | } | |
901 | ||
902 | static int smb_direct_post_send(struct smb_direct_transport *t, | |
070fb21e | 903 | struct ib_send_wr *wr) |
0626e664 NJ |
904 | { |
905 | int ret; | |
906 | ||
11659a8d | 907 | atomic_inc(&t->send_pending); |
0626e664 NJ |
908 | ret = ib_post_send(t->qp, wr, NULL); |
909 | if (ret) { | |
bde1694a | 910 | pr_err("failed to post send: %d\n", ret); |
11659a8d HL |
911 | if (atomic_dec_and_test(&t->send_pending)) |
912 | wake_up(&t->wait_send_pending); | |
0626e664 NJ |
913 | smb_direct_disconnect_rdma_connection(t); |
914 | } | |
915 | return ret; | |
916 | } | |
917 | ||
918 | static void smb_direct_send_ctx_init(struct smb_direct_transport *t, | |
070fb21e NJ |
919 | struct smb_direct_send_ctx *send_ctx, |
920 | bool need_invalidate_rkey, | |
921 | unsigned int remote_key) | |
0626e664 NJ |
922 | { |
923 | INIT_LIST_HEAD(&send_ctx->msg_list); | |
924 | send_ctx->wr_cnt = 0; | |
925 | send_ctx->need_invalidate_rkey = need_invalidate_rkey; | |
926 | send_ctx->remote_key = remote_key; | |
927 | } | |
928 | ||
929 | static int smb_direct_flush_send_list(struct smb_direct_transport *t, | |
070fb21e NJ |
930 | struct smb_direct_send_ctx *send_ctx, |
931 | bool is_last) | |
0626e664 NJ |
932 | { |
933 | struct smb_direct_sendmsg *first, *last; | |
934 | int ret; | |
935 | ||
936 | if (list_empty(&send_ctx->msg_list)) | |
937 | return 0; | |
938 | ||
939 | first = list_first_entry(&send_ctx->msg_list, | |
070fb21e NJ |
940 | struct smb_direct_sendmsg, |
941 | list); | |
0626e664 | 942 | last = list_last_entry(&send_ctx->msg_list, |
070fb21e NJ |
943 | struct smb_direct_sendmsg, |
944 | list); | |
0626e664 NJ |
945 | |
946 | last->wr.send_flags = IB_SEND_SIGNALED; | |
947 | last->wr.wr_cqe = &last->cqe; | |
948 | if (is_last && send_ctx->need_invalidate_rkey) { | |
949 | last->wr.opcode = IB_WR_SEND_WITH_INV; | |
950 | last->wr.ex.invalidate_rkey = send_ctx->remote_key; | |
951 | } | |
952 | ||
953 | ret = smb_direct_post_send(t, &first->wr); | |
954 | if (!ret) { | |
955 | smb_direct_send_ctx_init(t, send_ctx, | |
070fb21e NJ |
956 | send_ctx->need_invalidate_rkey, |
957 | send_ctx->remote_key); | |
0626e664 NJ |
958 | } else { |
959 | atomic_add(send_ctx->wr_cnt, &t->send_credits); | |
960 | wake_up(&t->wait_send_credits); | |
961 | list_for_each_entry_safe(first, last, &send_ctx->msg_list, | |
070fb21e | 962 | list) { |
0626e664 NJ |
963 | smb_direct_free_sendmsg(t, first); |
964 | } | |
965 | } | |
966 | return ret; | |
967 | } | |
968 | ||
969 | static int wait_for_credits(struct smb_direct_transport *t, | |
ddbdc861 HL |
970 | wait_queue_head_t *waitq, atomic_t *total_credits, |
971 | int needed) | |
0626e664 NJ |
972 | { |
973 | int ret; | |
974 | ||
975 | do { | |
ddbdc861 | 976 | if (atomic_sub_return(needed, total_credits) >= 0) |
0626e664 NJ |
977 | return 0; |
978 | ||
ddbdc861 | 979 | atomic_add(needed, total_credits); |
0626e664 | 980 | ret = wait_event_interruptible(*waitq, |
ddbdc861 HL |
981 | atomic_read(total_credits) >= needed || |
982 | t->status != SMB_DIRECT_CS_CONNECTED); | |
0626e664 NJ |
983 | |
984 | if (t->status != SMB_DIRECT_CS_CONNECTED) | |
985 | return -ENOTCONN; | |
986 | else if (ret < 0) | |
987 | return ret; | |
988 | } while (true); | |
989 | } | |
990 | ||
991 | static int wait_for_send_credits(struct smb_direct_transport *t, | |
070fb21e | 992 | struct smb_direct_send_ctx *send_ctx) |
0626e664 NJ |
993 | { |
994 | int ret; | |
995 | ||
070fb21e NJ |
996 | if (send_ctx && |
997 | (send_ctx->wr_cnt >= 16 || atomic_read(&t->send_credits) <= 1)) { | |
0626e664 NJ |
998 | ret = smb_direct_flush_send_list(t, send_ctx, false); |
999 | if (ret) | |
1000 | return ret; | |
1001 | } | |
1002 | ||
ddbdc861 HL |
1003 | return wait_for_credits(t, &t->wait_send_credits, &t->send_credits, 1); |
1004 | } | |
1005 | ||
1006 | static int wait_for_rw_credits(struct smb_direct_transport *t, int credits) | |
1007 | { | |
1008 | return wait_for_credits(t, &t->wait_rw_credits, &t->rw_credits, credits); | |
1009 | } | |
1010 | ||
1011 | static int calc_rw_credits(struct smb_direct_transport *t, | |
1012 | char *buf, unsigned int len) | |
1013 | { | |
1014 | return DIV_ROUND_UP(get_buf_page_count(buf, len), | |
1015 | t->pages_per_rw_credit); | |
0626e664 NJ |
1016 | } |
1017 | ||
1018 | static int smb_direct_create_header(struct smb_direct_transport *t, | |
070fb21e NJ |
1019 | int size, int remaining_data_length, |
1020 | struct smb_direct_sendmsg **sendmsg_out) | |
0626e664 NJ |
1021 | { |
1022 | struct smb_direct_sendmsg *sendmsg; | |
1023 | struct smb_direct_data_transfer *packet; | |
1024 | int header_length; | |
1025 | int ret; | |
1026 | ||
1027 | sendmsg = smb_direct_alloc_sendmsg(t); | |
8ef32967 DC |
1028 | if (IS_ERR(sendmsg)) |
1029 | return PTR_ERR(sendmsg); | |
0626e664 NJ |
1030 | |
1031 | /* Fill in the packet header */ | |
1032 | packet = (struct smb_direct_data_transfer *)sendmsg->packet; | |
1033 | packet->credits_requested = cpu_to_le16(t->send_credit_target); | |
1034 | packet->credits_granted = cpu_to_le16(manage_credits_prior_sending(t)); | |
1035 | ||
1036 | packet->flags = 0; | |
1037 | packet->reserved = 0; | |
1038 | if (!size) | |
1039 | packet->data_offset = 0; | |
1040 | else | |
1041 | packet->data_offset = cpu_to_le32(24); | |
1042 | packet->data_length = cpu_to_le32(size); | |
1043 | packet->remaining_data_length = cpu_to_le32(remaining_data_length); | |
1044 | packet->padding = 0; | |
1045 | ||
1046 | ksmbd_debug(RDMA, | |
070fb21e NJ |
1047 | "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n", |
1048 | le16_to_cpu(packet->credits_requested), | |
1049 | le16_to_cpu(packet->credits_granted), | |
1050 | le32_to_cpu(packet->data_offset), | |
1051 | le32_to_cpu(packet->data_length), | |
1052 | le32_to_cpu(packet->remaining_data_length)); | |
0626e664 NJ |
1053 | |
1054 | /* Map the packet to DMA */ | |
1055 | header_length = sizeof(struct smb_direct_data_transfer); | |
1056 | /* If this is a packet without payload, don't send padding */ | |
1057 | if (!size) | |
1058 | header_length = | |
1059 | offsetof(struct smb_direct_data_transfer, padding); | |
1060 | ||
1061 | sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, | |
1062 | (void *)packet, | |
1063 | header_length, | |
1064 | DMA_TO_DEVICE); | |
1065 | ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr); | |
1066 | if (ret) { | |
1067 | smb_direct_free_sendmsg(t, sendmsg); | |
1068 | return ret; | |
1069 | } | |
1070 | ||
1071 | sendmsg->num_sge = 1; | |
1072 | sendmsg->sge[0].length = header_length; | |
1073 | sendmsg->sge[0].lkey = t->pd->local_dma_lkey; | |
1074 | ||
1075 | *sendmsg_out = sendmsg; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
64b39f4a | 1079 | static int get_sg_list(void *buf, int size, struct scatterlist *sg_list, int nentries) |
0626e664 NJ |
1080 | { |
1081 | bool high = is_vmalloc_addr(buf); | |
1082 | struct page *page; | |
1083 | int offset, len; | |
1084 | int i = 0; | |
1085 | ||
4e3edd00 | 1086 | if (size <= 0 || nentries < get_buf_page_count(buf, size)) |
0626e664 NJ |
1087 | return -EINVAL; |
1088 | ||
1089 | offset = offset_in_page(buf); | |
1090 | buf -= offset; | |
1091 | while (size > 0) { | |
1092 | len = min_t(int, PAGE_SIZE - offset, size); | |
1093 | if (high) | |
1094 | page = vmalloc_to_page(buf); | |
1095 | else | |
1096 | page = kmap_to_page(buf); | |
1097 | ||
1098 | if (!sg_list) | |
1099 | return -EINVAL; | |
1100 | sg_set_page(sg_list, page, len, offset); | |
1101 | sg_list = sg_next(sg_list); | |
1102 | ||
1103 | buf += PAGE_SIZE; | |
1104 | size -= len; | |
1105 | offset = 0; | |
1106 | i++; | |
1107 | } | |
1108 | return i; | |
1109 | } | |
1110 | ||
1111 | static int get_mapped_sg_list(struct ib_device *device, void *buf, int size, | |
070fb21e NJ |
1112 | struct scatterlist *sg_list, int nentries, |
1113 | enum dma_data_direction dir) | |
0626e664 NJ |
1114 | { |
1115 | int npages; | |
1116 | ||
1117 | npages = get_sg_list(buf, size, sg_list, nentries); | |
4e3edd00 | 1118 | if (npages < 0) |
0626e664 NJ |
1119 | return -EINVAL; |
1120 | return ib_dma_map_sg(device, sg_list, npages, dir); | |
1121 | } | |
1122 | ||
1123 | static int post_sendmsg(struct smb_direct_transport *t, | |
070fb21e NJ |
1124 | struct smb_direct_send_ctx *send_ctx, |
1125 | struct smb_direct_sendmsg *msg) | |
0626e664 NJ |
1126 | { |
1127 | int i; | |
1128 | ||
1129 | for (i = 0; i < msg->num_sge; i++) | |
1130 | ib_dma_sync_single_for_device(t->cm_id->device, | |
070fb21e NJ |
1131 | msg->sge[i].addr, msg->sge[i].length, |
1132 | DMA_TO_DEVICE); | |
0626e664 NJ |
1133 | |
1134 | msg->cqe.done = send_done; | |
1135 | msg->wr.opcode = IB_WR_SEND; | |
1136 | msg->wr.sg_list = &msg->sge[0]; | |
1137 | msg->wr.num_sge = msg->num_sge; | |
1138 | msg->wr.next = NULL; | |
1139 | ||
1140 | if (send_ctx) { | |
1141 | msg->wr.wr_cqe = NULL; | |
1142 | msg->wr.send_flags = 0; | |
1143 | if (!list_empty(&send_ctx->msg_list)) { | |
1144 | struct smb_direct_sendmsg *last; | |
1145 | ||
1146 | last = list_last_entry(&send_ctx->msg_list, | |
1147 | struct smb_direct_sendmsg, | |
1148 | list); | |
1149 | last->wr.next = &msg->wr; | |
1150 | } | |
1151 | list_add_tail(&msg->list, &send_ctx->msg_list); | |
1152 | send_ctx->wr_cnt++; | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | msg->wr.wr_cqe = &msg->cqe; | |
1157 | msg->wr.send_flags = IB_SEND_SIGNALED; | |
1158 | return smb_direct_post_send(t, &msg->wr); | |
1159 | } | |
1160 | ||
1161 | static int smb_direct_post_send_data(struct smb_direct_transport *t, | |
070fb21e NJ |
1162 | struct smb_direct_send_ctx *send_ctx, |
1163 | struct kvec *iov, int niov, | |
1164 | int remaining_data_length) | |
0626e664 NJ |
1165 | { |
1166 | int i, j, ret; | |
1167 | struct smb_direct_sendmsg *msg; | |
1168 | int data_length; | |
64b39f4a | 1169 | struct scatterlist sg[SMB_DIRECT_MAX_SEND_SGES - 1]; |
0626e664 NJ |
1170 | |
1171 | ret = wait_for_send_credits(t, send_ctx); | |
1172 | if (ret) | |
1173 | return ret; | |
1174 | ||
1175 | data_length = 0; | |
1176 | for (i = 0; i < niov; i++) | |
1177 | data_length += iov[i].iov_len; | |
1178 | ||
1179 | ret = smb_direct_create_header(t, data_length, remaining_data_length, | |
1180 | &msg); | |
1181 | if (ret) { | |
1182 | atomic_inc(&t->send_credits); | |
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | for (i = 0; i < niov; i++) { | |
1187 | struct ib_sge *sge; | |
1188 | int sg_cnt; | |
1189 | ||
64b39f4a | 1190 | sg_init_table(sg, SMB_DIRECT_MAX_SEND_SGES - 1); |
0626e664 | 1191 | sg_cnt = get_mapped_sg_list(t->cm_id->device, |
070fb21e NJ |
1192 | iov[i].iov_base, iov[i].iov_len, |
1193 | sg, SMB_DIRECT_MAX_SEND_SGES - 1, | |
1194 | DMA_TO_DEVICE); | |
0626e664 | 1195 | if (sg_cnt <= 0) { |
bde1694a | 1196 | pr_err("failed to map buffer\n"); |
bc3fcc94 | 1197 | ret = -ENOMEM; |
0626e664 | 1198 | goto err; |
72d6cbb5 | 1199 | } else if (sg_cnt + msg->num_sge > SMB_DIRECT_MAX_SEND_SGES) { |
bde1694a | 1200 | pr_err("buffer not fitted into sges\n"); |
0626e664 NJ |
1201 | ret = -E2BIG; |
1202 | ib_dma_unmap_sg(t->cm_id->device, sg, sg_cnt, | |
1203 | DMA_TO_DEVICE); | |
1204 | goto err; | |
1205 | } | |
1206 | ||
1207 | for (j = 0; j < sg_cnt; j++) { | |
1208 | sge = &msg->sge[msg->num_sge]; | |
1209 | sge->addr = sg_dma_address(&sg[j]); | |
1210 | sge->length = sg_dma_len(&sg[j]); | |
1211 | sge->lkey = t->pd->local_dma_lkey; | |
1212 | msg->num_sge++; | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | ret = post_sendmsg(t, send_ctx, msg); | |
1217 | if (ret) | |
1218 | goto err; | |
1219 | return 0; | |
1220 | err: | |
1221 | smb_direct_free_sendmsg(t, msg); | |
1222 | atomic_inc(&t->send_credits); | |
1223 | return ret; | |
1224 | } | |
1225 | ||
1226 | static int smb_direct_writev(struct ksmbd_transport *t, | |
070fb21e NJ |
1227 | struct kvec *iov, int niovs, int buflen, |
1228 | bool need_invalidate, unsigned int remote_key) | |
0626e664 | 1229 | { |
02d4b4aa | 1230 | struct smb_direct_transport *st = smb_trans_direct_transfort(t); |
0626e664 NJ |
1231 | int remaining_data_length; |
1232 | int start, i, j; | |
1233 | int max_iov_size = st->max_send_size - | |
1234 | sizeof(struct smb_direct_data_transfer); | |
1235 | int ret; | |
1236 | struct kvec vec; | |
1237 | struct smb_direct_send_ctx send_ctx; | |
1238 | ||
b8fc94cd NJ |
1239 | if (st->status != SMB_DIRECT_CS_CONNECTED) |
1240 | return -ENOTCONN; | |
0626e664 NJ |
1241 | |
1242 | //FIXME: skip RFC1002 header.. | |
1243 | buflen -= 4; | |
1244 | iov[0].iov_base += 4; | |
1245 | iov[0].iov_len -= 4; | |
1246 | ||
1247 | remaining_data_length = buflen; | |
1248 | ksmbd_debug(RDMA, "Sending smb (RDMA): smb_len=%u\n", buflen); | |
1249 | ||
1250 | smb_direct_send_ctx_init(st, &send_ctx, need_invalidate, remote_key); | |
1251 | start = i = 0; | |
1252 | buflen = 0; | |
1253 | while (true) { | |
1254 | buflen += iov[i].iov_len; | |
1255 | if (buflen > max_iov_size) { | |
1256 | if (i > start) { | |
1257 | remaining_data_length -= | |
64b39f4a | 1258 | (buflen - iov[i].iov_len); |
0626e664 | 1259 | ret = smb_direct_post_send_data(st, &send_ctx, |
070fb21e NJ |
1260 | &iov[start], i - start, |
1261 | remaining_data_length); | |
0626e664 NJ |
1262 | if (ret) |
1263 | goto done; | |
1264 | } else { | |
1265 | /* iov[start] is too big, break it */ | |
64b39f4a | 1266 | int nvec = (buflen + max_iov_size - 1) / |
0626e664 NJ |
1267 | max_iov_size; |
1268 | ||
1269 | for (j = 0; j < nvec; j++) { | |
1270 | vec.iov_base = | |
1271 | (char *)iov[start].iov_base + | |
64b39f4a | 1272 | j * max_iov_size; |
0626e664 NJ |
1273 | vec.iov_len = |
1274 | min_t(int, max_iov_size, | |
070fb21e | 1275 | buflen - max_iov_size * j); |
0626e664 | 1276 | remaining_data_length -= vec.iov_len; |
070fb21e NJ |
1277 | ret = smb_direct_post_send_data(st, &send_ctx, &vec, 1, |
1278 | remaining_data_length); | |
0626e664 NJ |
1279 | if (ret) |
1280 | goto done; | |
1281 | } | |
1282 | i++; | |
1283 | if (i == niovs) | |
1284 | break; | |
1285 | } | |
1286 | start = i; | |
1287 | buflen = 0; | |
1288 | } else { | |
1289 | i++; | |
1290 | if (i == niovs) { | |
1291 | /* send out all remaining vecs */ | |
1292 | remaining_data_length -= buflen; | |
1293 | ret = smb_direct_post_send_data(st, &send_ctx, | |
070fb21e NJ |
1294 | &iov[start], i - start, |
1295 | remaining_data_length); | |
0626e664 NJ |
1296 | if (ret) |
1297 | goto done; | |
1298 | break; | |
1299 | } | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | done: | |
1304 | ret = smb_direct_flush_send_list(st, &send_ctx, true); | |
1305 | ||
1306 | /* | |
1307 | * As an optimization, we don't wait for individual I/O to finish | |
1308 | * before sending the next one. | |
1309 | * Send them all and wait for pending send count to get to 0 | |
1310 | * that means all the I/Os have been out and we are good to return | |
1311 | */ | |
1312 | ||
11659a8d HL |
1313 | wait_event(st->wait_send_pending, |
1314 | atomic_read(&st->send_pending) == 0); | |
0626e664 NJ |
1315 | return ret; |
1316 | } | |
1317 | ||
ee1b0558 HL |
1318 | static void smb_direct_free_rdma_rw_msg(struct smb_direct_transport *t, |
1319 | struct smb_direct_rdma_rw_msg *msg, | |
1320 | enum dma_data_direction dir) | |
1321 | { | |
1322 | rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port, | |
1323 | msg->sgt.sgl, msg->sgt.nents, dir); | |
1324 | sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); | |
1325 | kfree(msg); | |
1326 | } | |
1327 | ||
0626e664 | 1328 | static void read_write_done(struct ib_cq *cq, struct ib_wc *wc, |
070fb21e | 1329 | enum dma_data_direction dir) |
0626e664 NJ |
1330 | { |
1331 | struct smb_direct_rdma_rw_msg *msg = container_of(wc->wr_cqe, | |
070fb21e | 1332 | struct smb_direct_rdma_rw_msg, cqe); |
0626e664 NJ |
1333 | struct smb_direct_transport *t = msg->t; |
1334 | ||
1335 | if (wc->status != IB_WC_SUCCESS) { | |
ee1b0558 | 1336 | msg->status = -EIO; |
bde1694a NJ |
1337 | pr_err("read/write error. opcode = %d, status = %s(%d)\n", |
1338 | wc->opcode, ib_wc_status_msg(wc->status), wc->status); | |
ee1b0558 HL |
1339 | if (wc->status != IB_WC_WR_FLUSH_ERR) |
1340 | smb_direct_disconnect_rdma_connection(t); | |
0626e664 NJ |
1341 | } |
1342 | ||
0626e664 | 1343 | complete(msg->completion); |
0626e664 NJ |
1344 | } |
1345 | ||
1346 | static void read_done(struct ib_cq *cq, struct ib_wc *wc) | |
1347 | { | |
1348 | read_write_done(cq, wc, DMA_FROM_DEVICE); | |
1349 | } | |
1350 | ||
1351 | static void write_done(struct ib_cq *cq, struct ib_wc *wc) | |
1352 | { | |
1353 | read_write_done(cq, wc, DMA_TO_DEVICE); | |
1354 | } | |
1355 | ||
1807abcf HL |
1356 | static int smb_direct_rdma_xmit(struct smb_direct_transport *t, |
1357 | void *buf, int buf_len, | |
1358 | struct smb2_buffer_desc_v1 *desc, | |
1359 | unsigned int desc_len, | |
1360 | bool is_read) | |
0626e664 | 1361 | { |
ee1b0558 HL |
1362 | struct smb_direct_rdma_rw_msg *msg, *next_msg; |
1363 | int i, ret; | |
0626e664 | 1364 | DECLARE_COMPLETION_ONSTACK(completion); |
ee1b0558 HL |
1365 | struct ib_send_wr *first_wr; |
1366 | LIST_HEAD(msg_list); | |
1367 | char *desc_buf; | |
ddbdc861 | 1368 | int credits_needed; |
ee1b0558 HL |
1369 | unsigned int desc_buf_len; |
1370 | size_t total_length = 0; | |
1371 | ||
1372 | if (t->status != SMB_DIRECT_CS_CONNECTED) | |
1373 | return -ENOTCONN; | |
1374 | ||
1375 | /* calculate needed credits */ | |
1376 | credits_needed = 0; | |
1377 | desc_buf = buf; | |
1378 | for (i = 0; i < desc_len / sizeof(*desc); i++) { | |
1379 | desc_buf_len = le32_to_cpu(desc[i].length); | |
1380 | ||
1381 | credits_needed += calc_rw_credits(t, desc_buf, desc_buf_len); | |
1382 | desc_buf += desc_buf_len; | |
1383 | total_length += desc_buf_len; | |
1384 | if (desc_buf_len == 0 || total_length > buf_len || | |
1385 | total_length > t->max_rdma_rw_size) | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | ||
1389 | ksmbd_debug(RDMA, "RDMA %s, len %#x, needed credits %#x\n", | |
1390 | is_read ? "read" : "write", buf_len, credits_needed); | |
0626e664 | 1391 | |
ddbdc861 | 1392 | ret = wait_for_rw_credits(t, credits_needed); |
0626e664 NJ |
1393 | if (ret < 0) |
1394 | return ret; | |
1395 | ||
ee1b0558 HL |
1396 | /* build rdma_rw_ctx for each descriptor */ |
1397 | desc_buf = buf; | |
1398 | for (i = 0; i < desc_len / sizeof(*desc); i++) { | |
1399 | msg = kzalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) + | |
1400 | sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL); | |
1401 | if (!msg) { | |
1402 | ret = -ENOMEM; | |
1403 | goto out; | |
1404 | } | |
0626e664 | 1405 | |
ee1b0558 | 1406 | desc_buf_len = le32_to_cpu(desc[i].length); |
0626e664 | 1407 | |
ee1b0558 HL |
1408 | msg->t = t; |
1409 | msg->cqe.done = is_read ? read_done : write_done; | |
1410 | msg->completion = &completion; | |
0626e664 | 1411 | |
ee1b0558 HL |
1412 | msg->sgt.sgl = &msg->sg_list[0]; |
1413 | ret = sg_alloc_table_chained(&msg->sgt, | |
1414 | get_buf_page_count(desc_buf, desc_buf_len), | |
1415 | msg->sg_list, SG_CHUNK_SIZE); | |
1416 | if (ret) { | |
1417 | kfree(msg); | |
1418 | ret = -ENOMEM; | |
1419 | goto out; | |
1420 | } | |
1421 | ||
1422 | ret = get_sg_list(desc_buf, desc_buf_len, | |
1423 | msg->sgt.sgl, msg->sgt.orig_nents); | |
1424 | if (ret < 0) { | |
1425 | sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); | |
1426 | kfree(msg); | |
1427 | goto out; | |
1428 | } | |
1429 | ||
1430 | ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port, | |
1431 | msg->sgt.sgl, | |
1432 | get_buf_page_count(desc_buf, desc_buf_len), | |
1433 | 0, | |
1434 | le64_to_cpu(desc[i].offset), | |
1435 | le32_to_cpu(desc[i].token), | |
1436 | is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1437 | if (ret < 0) { | |
1438 | pr_err("failed to init rdma_rw_ctx: %d\n", ret); | |
1439 | sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE); | |
1440 | kfree(msg); | |
1441 | goto out; | |
1442 | } | |
1443 | ||
1444 | list_add_tail(&msg->list, &msg_list); | |
1445 | desc_buf += desc_buf_len; | |
0626e664 NJ |
1446 | } |
1447 | ||
ee1b0558 HL |
1448 | /* concatenate work requests of rdma_rw_ctxs */ |
1449 | first_wr = NULL; | |
1450 | list_for_each_entry_reverse(msg, &msg_list, list) { | |
1451 | first_wr = rdma_rw_ctx_wrs(&msg->rw_ctx, t->qp, t->qp->port, | |
1452 | &msg->cqe, first_wr); | |
1453 | } | |
0626e664 NJ |
1454 | |
1455 | ret = ib_post_send(t->qp, first_wr, NULL); | |
1456 | if (ret) { | |
ee1b0558 HL |
1457 | pr_err("failed to post send wr for RDMA R/W: %d\n", ret); |
1458 | goto out; | |
0626e664 NJ |
1459 | } |
1460 | ||
ee1b0558 | 1461 | msg = list_last_entry(&msg_list, struct smb_direct_rdma_rw_msg, list); |
0626e664 | 1462 | wait_for_completion(&completion); |
ee1b0558 HL |
1463 | ret = msg->status; |
1464 | out: | |
1465 | list_for_each_entry_safe(msg, next_msg, &msg_list, list) { | |
1466 | list_del(&msg->list); | |
1467 | smb_direct_free_rdma_rw_msg(t, msg, | |
1468 | is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
1469 | } | |
ddbdc861 | 1470 | atomic_add(credits_needed, &t->rw_credits); |
ee1b0558 | 1471 | wake_up(&t->wait_rw_credits); |
0626e664 | 1472 | return ret; |
0626e664 NJ |
1473 | } |
1474 | ||
1807abcf HL |
1475 | static int smb_direct_rdma_write(struct ksmbd_transport *t, |
1476 | void *buf, unsigned int buflen, | |
1477 | struct smb2_buffer_desc_v1 *desc, | |
1478 | unsigned int desc_len) | |
0626e664 | 1479 | { |
02d4b4aa | 1480 | return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen, |
1807abcf | 1481 | desc, desc_len, false); |
0626e664 NJ |
1482 | } |
1483 | ||
1807abcf HL |
1484 | static int smb_direct_rdma_read(struct ksmbd_transport *t, |
1485 | void *buf, unsigned int buflen, | |
1486 | struct smb2_buffer_desc_v1 *desc, | |
1487 | unsigned int desc_len) | |
0626e664 | 1488 | { |
02d4b4aa | 1489 | return smb_direct_rdma_xmit(smb_trans_direct_transfort(t), buf, buflen, |
1807abcf | 1490 | desc, desc_len, true); |
0626e664 NJ |
1491 | } |
1492 | ||
1493 | static void smb_direct_disconnect(struct ksmbd_transport *t) | |
1494 | { | |
02d4b4aa | 1495 | struct smb_direct_transport *st = smb_trans_direct_transfort(t); |
0626e664 NJ |
1496 | |
1497 | ksmbd_debug(RDMA, "Disconnecting cm_id=%p\n", st->cm_id); | |
1498 | ||
323b1ea1 | 1499 | smb_direct_disconnect_rdma_work(&st->disconnect_work); |
0626e664 | 1500 | wait_event_interruptible(st->wait_status, |
070fb21e | 1501 | st->status == SMB_DIRECT_CS_DISCONNECTED); |
0626e664 NJ |
1502 | free_transport(st); |
1503 | } | |
1504 | ||
136dff3a YC |
1505 | static void smb_direct_shutdown(struct ksmbd_transport *t) |
1506 | { | |
1507 | struct smb_direct_transport *st = smb_trans_direct_transfort(t); | |
1508 | ||
1509 | ksmbd_debug(RDMA, "smb-direct shutdown cm_id=%p\n", st->cm_id); | |
1510 | ||
1511 | smb_direct_disconnect_rdma_work(&st->disconnect_work); | |
1512 | } | |
1513 | ||
0626e664 | 1514 | static int smb_direct_cm_handler(struct rdma_cm_id *cm_id, |
070fb21e | 1515 | struct rdma_cm_event *event) |
0626e664 NJ |
1516 | { |
1517 | struct smb_direct_transport *t = cm_id->context; | |
1518 | ||
1519 | ksmbd_debug(RDMA, "RDMA CM event. cm_id=%p event=%s (%d)\n", | |
070fb21e | 1520 | cm_id, rdma_event_msg(event->event), event->event); |
0626e664 NJ |
1521 | |
1522 | switch (event->event) { | |
1523 | case RDMA_CM_EVENT_ESTABLISHED: { | |
1524 | t->status = SMB_DIRECT_CS_CONNECTED; | |
1525 | wake_up_interruptible(&t->wait_status); | |
1526 | break; | |
1527 | } | |
1528 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
1529 | case RDMA_CM_EVENT_DISCONNECTED: { | |
141fa982 NJ |
1530 | ib_drain_qp(t->qp); |
1531 | ||
0626e664 NJ |
1532 | t->status = SMB_DIRECT_CS_DISCONNECTED; |
1533 | wake_up_interruptible(&t->wait_status); | |
1534 | wake_up_interruptible(&t->wait_reassembly_queue); | |
1535 | wake_up(&t->wait_send_credits); | |
1536 | break; | |
1537 | } | |
1538 | case RDMA_CM_EVENT_CONNECT_ERROR: { | |
1539 | t->status = SMB_DIRECT_CS_DISCONNECTED; | |
1540 | wake_up_interruptible(&t->wait_status); | |
1541 | break; | |
1542 | } | |
1543 | default: | |
bde1694a NJ |
1544 | pr_err("Unexpected RDMA CM event. cm_id=%p, event=%s (%d)\n", |
1545 | cm_id, rdma_event_msg(event->event), | |
1546 | event->event); | |
0626e664 NJ |
1547 | break; |
1548 | } | |
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | static void smb_direct_qpair_handler(struct ib_event *event, void *context) | |
1553 | { | |
1554 | struct smb_direct_transport *t = context; | |
1555 | ||
1556 | ksmbd_debug(RDMA, "Received QP event. cm_id=%p, event=%s (%d)\n", | |
070fb21e | 1557 | t->cm_id, ib_event_msg(event->event), event->event); |
0626e664 NJ |
1558 | |
1559 | switch (event->event) { | |
1560 | case IB_EVENT_CQ_ERR: | |
1561 | case IB_EVENT_QP_FATAL: | |
1562 | smb_direct_disconnect_rdma_connection(t); | |
1563 | break; | |
1564 | default: | |
1565 | break; | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | static int smb_direct_send_negotiate_response(struct smb_direct_transport *t, | |
070fb21e | 1570 | int failed) |
0626e664 NJ |
1571 | { |
1572 | struct smb_direct_sendmsg *sendmsg; | |
1573 | struct smb_direct_negotiate_resp *resp; | |
1574 | int ret; | |
1575 | ||
1576 | sendmsg = smb_direct_alloc_sendmsg(t); | |
1577 | if (IS_ERR(sendmsg)) | |
1578 | return -ENOMEM; | |
1579 | ||
1580 | resp = (struct smb_direct_negotiate_resp *)sendmsg->packet; | |
1581 | if (failed) { | |
1582 | memset(resp, 0, sizeof(*resp)); | |
1583 | resp->min_version = cpu_to_le16(0x0100); | |
1584 | resp->max_version = cpu_to_le16(0x0100); | |
1585 | resp->status = STATUS_NOT_SUPPORTED; | |
1586 | } else { | |
1587 | resp->status = STATUS_SUCCESS; | |
1588 | resp->min_version = SMB_DIRECT_VERSION_LE; | |
1589 | resp->max_version = SMB_DIRECT_VERSION_LE; | |
1590 | resp->negotiated_version = SMB_DIRECT_VERSION_LE; | |
1591 | resp->reserved = 0; | |
1592 | resp->credits_requested = | |
1593 | cpu_to_le16(t->send_credit_target); | |
64b39f4a | 1594 | resp->credits_granted = cpu_to_le16(manage_credits_prior_sending(t)); |
0626e664 NJ |
1595 | resp->max_readwrite_size = cpu_to_le32(t->max_rdma_rw_size); |
1596 | resp->preferred_send_size = cpu_to_le32(t->max_send_size); | |
1597 | resp->max_receive_size = cpu_to_le32(t->max_recv_size); | |
1598 | resp->max_fragmented_size = | |
1599 | cpu_to_le32(t->max_fragmented_recv_size); | |
1600 | } | |
1601 | ||
1602 | sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device, | |
070fb21e NJ |
1603 | (void *)resp, sizeof(*resp), |
1604 | DMA_TO_DEVICE); | |
1605 | ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr); | |
0626e664 NJ |
1606 | if (ret) { |
1607 | smb_direct_free_sendmsg(t, sendmsg); | |
1608 | return ret; | |
1609 | } | |
1610 | ||
1611 | sendmsg->num_sge = 1; | |
1612 | sendmsg->sge[0].length = sizeof(*resp); | |
1613 | sendmsg->sge[0].lkey = t->pd->local_dma_lkey; | |
1614 | ||
1615 | ret = post_sendmsg(t, NULL, sendmsg); | |
1616 | if (ret) { | |
1617 | smb_direct_free_sendmsg(t, sendmsg); | |
1618 | return ret; | |
1619 | } | |
1620 | ||
1621 | wait_event(t->wait_send_pending, | |
070fb21e | 1622 | atomic_read(&t->send_pending) == 0); |
0626e664 NJ |
1623 | return 0; |
1624 | } | |
1625 | ||
1626 | static int smb_direct_accept_client(struct smb_direct_transport *t) | |
1627 | { | |
1628 | struct rdma_conn_param conn_param; | |
1629 | struct ib_port_immutable port_immutable; | |
1630 | u32 ird_ord_hdr[2]; | |
1631 | int ret; | |
1632 | ||
1633 | memset(&conn_param, 0, sizeof(conn_param)); | |
070fb21e NJ |
1634 | conn_param.initiator_depth = min_t(u8, t->cm_id->device->attrs.max_qp_rd_atom, |
1635 | SMB_DIRECT_CM_INITIATOR_DEPTH); | |
0626e664 NJ |
1636 | conn_param.responder_resources = 0; |
1637 | ||
1638 | t->cm_id->device->ops.get_port_immutable(t->cm_id->device, | |
070fb21e NJ |
1639 | t->cm_id->port_num, |
1640 | &port_immutable); | |
0626e664 NJ |
1641 | if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) { |
1642 | ird_ord_hdr[0] = conn_param.responder_resources; | |
1643 | ird_ord_hdr[1] = 1; | |
1644 | conn_param.private_data = ird_ord_hdr; | |
1645 | conn_param.private_data_len = sizeof(ird_ord_hdr); | |
1646 | } else { | |
1647 | conn_param.private_data = NULL; | |
1648 | conn_param.private_data_len = 0; | |
1649 | } | |
1650 | conn_param.retry_count = SMB_DIRECT_CM_RETRY; | |
1651 | conn_param.rnr_retry_count = SMB_DIRECT_CM_RNR_RETRY; | |
1652 | conn_param.flow_control = 0; | |
1653 | ||
1654 | ret = rdma_accept(t->cm_id, &conn_param); | |
1655 | if (ret) { | |
bde1694a | 1656 | pr_err("error at rdma_accept: %d\n", ret); |
0626e664 NJ |
1657 | return ret; |
1658 | } | |
0626e664 NJ |
1659 | return 0; |
1660 | } | |
1661 | ||
99b7650a | 1662 | static int smb_direct_prepare_negotiation(struct smb_direct_transport *t) |
0626e664 NJ |
1663 | { |
1664 | int ret; | |
1665 | struct smb_direct_recvmsg *recvmsg; | |
0626e664 NJ |
1666 | |
1667 | recvmsg = get_free_recvmsg(t); | |
1668 | if (!recvmsg) | |
1669 | return -ENOMEM; | |
1670 | recvmsg->type = SMB_DIRECT_MSG_NEGOTIATE_REQ; | |
1671 | ||
1672 | ret = smb_direct_post_recv(t, recvmsg); | |
1673 | if (ret) { | |
bde1694a | 1674 | pr_err("Can't post recv: %d\n", ret); |
99b7650a | 1675 | goto out_err; |
0626e664 NJ |
1676 | } |
1677 | ||
1678 | t->negotiation_requested = false; | |
1679 | ret = smb_direct_accept_client(t); | |
1680 | if (ret) { | |
bde1694a | 1681 | pr_err("Can't accept client\n"); |
99b7650a | 1682 | goto out_err; |
0626e664 NJ |
1683 | } |
1684 | ||
1685 | smb_direct_post_recv_credits(&t->post_recv_credits_work.work); | |
99b7650a HL |
1686 | return 0; |
1687 | out_err: | |
1688 | put_recvmsg(t, recvmsg); | |
0626e664 NJ |
1689 | return ret; |
1690 | } | |
1691 | ||
ddbdc861 HL |
1692 | static unsigned int smb_direct_get_max_fr_pages(struct smb_direct_transport *t) |
1693 | { | |
1694 | return min_t(unsigned int, | |
1695 | t->cm_id->device->attrs.max_fast_reg_page_list_len, | |
1696 | 256); | |
1697 | } | |
1698 | ||
0626e664 | 1699 | static int smb_direct_init_params(struct smb_direct_transport *t, |
070fb21e | 1700 | struct ib_qp_cap *cap) |
0626e664 NJ |
1701 | { |
1702 | struct ib_device *device = t->cm_id->device; | |
ddbdc861 HL |
1703 | int max_send_sges, max_rw_wrs, max_send_wrs; |
1704 | unsigned int max_sge_per_wr, wrs_per_credit; | |
0626e664 | 1705 | |
621433b7 HL |
1706 | /* need 3 more sge. because a SMB_DIRECT header, SMB2 header, |
1707 | * SMB2 response could be mapped. | |
0626e664 NJ |
1708 | */ |
1709 | t->max_send_size = smb_direct_max_send_size; | |
621433b7 | 1710 | max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 3; |
0626e664 | 1711 | if (max_send_sges > SMB_DIRECT_MAX_SEND_SGES) { |
bde1694a | 1712 | pr_err("max_send_size %d is too large\n", t->max_send_size); |
0626e664 NJ |
1713 | return -EINVAL; |
1714 | } | |
1715 | ||
ddbdc861 HL |
1716 | /* Calculate the number of work requests for RDMA R/W. |
1717 | * The maximum number of pages which can be registered | |
1718 | * with one Memory region can be transferred with one | |
1719 | * R/W credit. And at least 4 work requests for each credit | |
1720 | * are needed for MR registration, RDMA R/W, local & remote | |
1721 | * MR invalidation. | |
0626e664 NJ |
1722 | */ |
1723 | t->max_rdma_rw_size = smb_direct_max_read_write_size; | |
ddbdc861 HL |
1724 | t->pages_per_rw_credit = smb_direct_get_max_fr_pages(t); |
1725 | t->max_rw_credits = DIV_ROUND_UP(t->max_rdma_rw_size, | |
1726 | (t->pages_per_rw_credit - 1) * | |
1727 | PAGE_SIZE); | |
1728 | ||
1729 | max_sge_per_wr = min_t(unsigned int, device->attrs.max_send_sge, | |
1730 | device->attrs.max_sge_rd); | |
621433b7 HL |
1731 | max_sge_per_wr = max_t(unsigned int, max_sge_per_wr, |
1732 | max_send_sges); | |
ddbdc861 HL |
1733 | wrs_per_credit = max_t(unsigned int, 4, |
1734 | DIV_ROUND_UP(t->pages_per_rw_credit, | |
1735 | max_sge_per_wr) + 1); | |
1736 | max_rw_wrs = t->max_rw_credits * wrs_per_credit; | |
0626e664 NJ |
1737 | |
1738 | max_send_wrs = smb_direct_send_credit_target + max_rw_wrs; | |
1739 | if (max_send_wrs > device->attrs.max_cqe || | |
64b39f4a | 1740 | max_send_wrs > device->attrs.max_qp_wr) { |
ddbdc861 HL |
1741 | pr_err("consider lowering send_credit_target = %d\n", |
1742 | smb_direct_send_credit_target); | |
bde1694a NJ |
1743 | pr_err("Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n", |
1744 | device->attrs.max_cqe, device->attrs.max_qp_wr); | |
0626e664 NJ |
1745 | return -EINVAL; |
1746 | } | |
1747 | ||
1748 | if (smb_direct_receive_credit_max > device->attrs.max_cqe || | |
1749 | smb_direct_receive_credit_max > device->attrs.max_qp_wr) { | |
bde1694a NJ |
1750 | pr_err("consider lowering receive_credit_max = %d\n", |
1751 | smb_direct_receive_credit_max); | |
1752 | pr_err("Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n", | |
1753 | device->attrs.max_cqe, device->attrs.max_qp_wr); | |
0626e664 NJ |
1754 | return -EINVAL; |
1755 | } | |
1756 | ||
0626e664 | 1757 | if (device->attrs.max_recv_sge < SMB_DIRECT_MAX_RECV_SGES) { |
bde1694a NJ |
1758 | pr_err("warning: device max_recv_sge = %d too small\n", |
1759 | device->attrs.max_recv_sge); | |
0626e664 NJ |
1760 | return -EINVAL; |
1761 | } | |
1762 | ||
1763 | t->recv_credits = 0; | |
1764 | t->count_avail_recvmsg = 0; | |
1765 | ||
1766 | t->recv_credit_max = smb_direct_receive_credit_max; | |
1767 | t->recv_credit_target = 10; | |
1768 | t->new_recv_credits = 0; | |
1769 | ||
1770 | t->send_credit_target = smb_direct_send_credit_target; | |
1771 | atomic_set(&t->send_credits, 0); | |
ddbdc861 | 1772 | atomic_set(&t->rw_credits, t->max_rw_credits); |
0626e664 NJ |
1773 | |
1774 | t->max_send_size = smb_direct_max_send_size; | |
1775 | t->max_recv_size = smb_direct_max_receive_size; | |
1776 | t->max_fragmented_recv_size = smb_direct_max_fragmented_recv_size; | |
1777 | ||
1778 | cap->max_send_wr = max_send_wrs; | |
1779 | cap->max_recv_wr = t->recv_credit_max; | |
ddbdc861 | 1780 | cap->max_send_sge = max_sge_per_wr; |
0626e664 NJ |
1781 | cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES; |
1782 | cap->max_inline_data = 0; | |
ddbdc861 | 1783 | cap->max_rdma_ctxs = t->max_rw_credits; |
0626e664 NJ |
1784 | return 0; |
1785 | } | |
1786 | ||
1787 | static void smb_direct_destroy_pools(struct smb_direct_transport *t) | |
1788 | { | |
1789 | struct smb_direct_recvmsg *recvmsg; | |
1790 | ||
1791 | while ((recvmsg = get_free_recvmsg(t))) | |
1792 | mempool_free(recvmsg, t->recvmsg_mempool); | |
1793 | while ((recvmsg = get_empty_recvmsg(t))) | |
1794 | mempool_free(recvmsg, t->recvmsg_mempool); | |
1795 | ||
1796 | mempool_destroy(t->recvmsg_mempool); | |
1797 | t->recvmsg_mempool = NULL; | |
1798 | ||
1799 | kmem_cache_destroy(t->recvmsg_cache); | |
1800 | t->recvmsg_cache = NULL; | |
1801 | ||
1802 | mempool_destroy(t->sendmsg_mempool); | |
1803 | t->sendmsg_mempool = NULL; | |
1804 | ||
1805 | kmem_cache_destroy(t->sendmsg_cache); | |
1806 | t->sendmsg_cache = NULL; | |
1807 | } | |
1808 | ||
1809 | static int smb_direct_create_pools(struct smb_direct_transport *t) | |
1810 | { | |
1811 | char name[80]; | |
1812 | int i; | |
1813 | struct smb_direct_recvmsg *recvmsg; | |
1814 | ||
1815 | snprintf(name, sizeof(name), "smb_direct_rqst_pool_%p", t); | |
1816 | t->sendmsg_cache = kmem_cache_create(name, | |
070fb21e NJ |
1817 | sizeof(struct smb_direct_sendmsg) + |
1818 | sizeof(struct smb_direct_negotiate_resp), | |
1819 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
0626e664 NJ |
1820 | if (!t->sendmsg_cache) |
1821 | return -ENOMEM; | |
1822 | ||
1823 | t->sendmsg_mempool = mempool_create(t->send_credit_target, | |
070fb21e NJ |
1824 | mempool_alloc_slab, mempool_free_slab, |
1825 | t->sendmsg_cache); | |
0626e664 NJ |
1826 | if (!t->sendmsg_mempool) |
1827 | goto err; | |
1828 | ||
1829 | snprintf(name, sizeof(name), "smb_direct_resp_%p", t); | |
1830 | t->recvmsg_cache = kmem_cache_create(name, | |
070fb21e NJ |
1831 | sizeof(struct smb_direct_recvmsg) + |
1832 | t->max_recv_size, | |
1833 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
0626e664 NJ |
1834 | if (!t->recvmsg_cache) |
1835 | goto err; | |
1836 | ||
1837 | t->recvmsg_mempool = | |
1838 | mempool_create(t->recv_credit_max, mempool_alloc_slab, | |
070fb21e | 1839 | mempool_free_slab, t->recvmsg_cache); |
0626e664 NJ |
1840 | if (!t->recvmsg_mempool) |
1841 | goto err; | |
1842 | ||
1843 | INIT_LIST_HEAD(&t->recvmsg_queue); | |
1844 | ||
1845 | for (i = 0; i < t->recv_credit_max; i++) { | |
1846 | recvmsg = mempool_alloc(t->recvmsg_mempool, GFP_KERNEL); | |
1847 | if (!recvmsg) | |
1848 | goto err; | |
1849 | recvmsg->transport = t; | |
1850 | list_add(&recvmsg->list, &t->recvmsg_queue); | |
1851 | } | |
1852 | t->count_avail_recvmsg = t->recv_credit_max; | |
1853 | ||
1854 | return 0; | |
1855 | err: | |
1856 | smb_direct_destroy_pools(t); | |
1857 | return -ENOMEM; | |
1858 | } | |
1859 | ||
1860 | static int smb_direct_create_qpair(struct smb_direct_transport *t, | |
070fb21e | 1861 | struct ib_qp_cap *cap) |
0626e664 NJ |
1862 | { |
1863 | int ret; | |
1864 | struct ib_qp_init_attr qp_attr; | |
c9f18927 | 1865 | int pages_per_rw; |
0626e664 NJ |
1866 | |
1867 | t->pd = ib_alloc_pd(t->cm_id->device, 0); | |
1868 | if (IS_ERR(t->pd)) { | |
bde1694a | 1869 | pr_err("Can't create RDMA PD\n"); |
0626e664 NJ |
1870 | ret = PTR_ERR(t->pd); |
1871 | t->pd = NULL; | |
1872 | return ret; | |
1873 | } | |
1874 | ||
1875 | t->send_cq = ib_alloc_cq(t->cm_id->device, t, | |
ddbdc861 HL |
1876 | smb_direct_send_credit_target + cap->max_rdma_ctxs, |
1877 | 0, IB_POLL_WORKQUEUE); | |
0626e664 | 1878 | if (IS_ERR(t->send_cq)) { |
bde1694a | 1879 | pr_err("Can't create RDMA send CQ\n"); |
0626e664 NJ |
1880 | ret = PTR_ERR(t->send_cq); |
1881 | t->send_cq = NULL; | |
1882 | goto err; | |
1883 | } | |
1884 | ||
1885 | t->recv_cq = ib_alloc_cq(t->cm_id->device, t, | |
ddbdc861 | 1886 | t->recv_credit_max, 0, IB_POLL_WORKQUEUE); |
0626e664 | 1887 | if (IS_ERR(t->recv_cq)) { |
bde1694a | 1888 | pr_err("Can't create RDMA recv CQ\n"); |
0626e664 NJ |
1889 | ret = PTR_ERR(t->recv_cq); |
1890 | t->recv_cq = NULL; | |
1891 | goto err; | |
1892 | } | |
1893 | ||
1894 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
1895 | qp_attr.event_handler = smb_direct_qpair_handler; | |
1896 | qp_attr.qp_context = t; | |
1897 | qp_attr.cap = *cap; | |
1898 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
1899 | qp_attr.qp_type = IB_QPT_RC; | |
1900 | qp_attr.send_cq = t->send_cq; | |
1901 | qp_attr.recv_cq = t->recv_cq; | |
1902 | qp_attr.port_num = ~0; | |
1903 | ||
1904 | ret = rdma_create_qp(t->cm_id, t->pd, &qp_attr); | |
1905 | if (ret) { | |
bde1694a | 1906 | pr_err("Can't create RDMA QP: %d\n", ret); |
0626e664 NJ |
1907 | goto err; |
1908 | } | |
1909 | ||
1910 | t->qp = t->cm_id->qp; | |
1911 | t->cm_id->event_handler = smb_direct_cm_handler; | |
1912 | ||
c9f18927 HL |
1913 | pages_per_rw = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1; |
1914 | if (pages_per_rw > t->cm_id->device->attrs.max_sgl_rd) { | |
ddbdc861 HL |
1915 | ret = ib_mr_pool_init(t->qp, &t->qp->rdma_mrs, |
1916 | t->max_rw_credits, IB_MR_TYPE_MEM_REG, | |
1917 | t->pages_per_rw_credit, 0); | |
c9f18927 HL |
1918 | if (ret) { |
1919 | pr_err("failed to init mr pool count %d pages %d\n", | |
ddbdc861 | 1920 | t->max_rw_credits, t->pages_per_rw_credit); |
c9f18927 HL |
1921 | goto err; |
1922 | } | |
1923 | } | |
1924 | ||
0626e664 NJ |
1925 | return 0; |
1926 | err: | |
1927 | if (t->qp) { | |
1928 | ib_destroy_qp(t->qp); | |
1929 | t->qp = NULL; | |
1930 | } | |
1931 | if (t->recv_cq) { | |
1932 | ib_destroy_cq(t->recv_cq); | |
1933 | t->recv_cq = NULL; | |
1934 | } | |
1935 | if (t->send_cq) { | |
1936 | ib_destroy_cq(t->send_cq); | |
1937 | t->send_cq = NULL; | |
1938 | } | |
1939 | if (t->pd) { | |
1940 | ib_dealloc_pd(t->pd); | |
1941 | t->pd = NULL; | |
1942 | } | |
1943 | return ret; | |
1944 | } | |
1945 | ||
1946 | static int smb_direct_prepare(struct ksmbd_transport *t) | |
1947 | { | |
02d4b4aa | 1948 | struct smb_direct_transport *st = smb_trans_direct_transfort(t); |
99b7650a HL |
1949 | struct smb_direct_recvmsg *recvmsg; |
1950 | struct smb_direct_negotiate_req *req; | |
1951 | int ret; | |
1952 | ||
1953 | ksmbd_debug(RDMA, "Waiting for SMB_DIRECT negotiate request\n"); | |
1954 | ret = wait_event_interruptible_timeout(st->wait_status, | |
1955 | st->negotiation_requested || | |
1956 | st->status == SMB_DIRECT_CS_DISCONNECTED, | |
1957 | SMB_DIRECT_NEGOTIATE_TIMEOUT * HZ); | |
1958 | if (ret <= 0 || st->status == SMB_DIRECT_CS_DISCONNECTED) | |
1959 | return ret < 0 ? ret : -ETIMEDOUT; | |
1960 | ||
1961 | recvmsg = get_first_reassembly(st); | |
1962 | if (!recvmsg) | |
1963 | return -ECONNABORTED; | |
1964 | ||
1965 | ret = smb_direct_check_recvmsg(recvmsg); | |
1966 | if (ret == -ECONNABORTED) | |
1967 | goto out; | |
1968 | ||
1969 | req = (struct smb_direct_negotiate_req *)recvmsg->packet; | |
1970 | st->max_recv_size = min_t(int, st->max_recv_size, | |
1971 | le32_to_cpu(req->preferred_send_size)); | |
1972 | st->max_send_size = min_t(int, st->max_send_size, | |
1973 | le32_to_cpu(req->max_receive_size)); | |
1974 | st->max_fragmented_send_size = | |
4d02c4fd HL |
1975 | le32_to_cpu(req->max_fragmented_size); |
1976 | st->max_fragmented_recv_size = | |
1977 | (st->recv_credit_max * st->max_recv_size) / 2; | |
99b7650a HL |
1978 | |
1979 | ret = smb_direct_send_negotiate_response(st, ret); | |
1980 | out: | |
1981 | spin_lock_irq(&st->reassembly_queue_lock); | |
1982 | st->reassembly_queue_length--; | |
1983 | list_del(&recvmsg->list); | |
1984 | spin_unlock_irq(&st->reassembly_queue_lock); | |
1985 | put_recvmsg(st, recvmsg); | |
1986 | ||
1987 | return ret; | |
1988 | } | |
1989 | ||
1990 | static int smb_direct_connect(struct smb_direct_transport *st) | |
1991 | { | |
0626e664 NJ |
1992 | int ret; |
1993 | struct ib_qp_cap qp_cap; | |
1994 | ||
1995 | ret = smb_direct_init_params(st, &qp_cap); | |
1996 | if (ret) { | |
bde1694a | 1997 | pr_err("Can't configure RDMA parameters\n"); |
0626e664 NJ |
1998 | return ret; |
1999 | } | |
2000 | ||
2001 | ret = smb_direct_create_pools(st); | |
2002 | if (ret) { | |
bde1694a | 2003 | pr_err("Can't init RDMA pool: %d\n", ret); |
0626e664 NJ |
2004 | return ret; |
2005 | } | |
2006 | ||
2007 | ret = smb_direct_create_qpair(st, &qp_cap); | |
2008 | if (ret) { | |
bde1694a | 2009 | pr_err("Can't accept RDMA client: %d\n", ret); |
0626e664 NJ |
2010 | return ret; |
2011 | } | |
2012 | ||
99b7650a | 2013 | ret = smb_direct_prepare_negotiation(st); |
0626e664 | 2014 | if (ret) { |
bde1694a | 2015 | pr_err("Can't negotiate: %d\n", ret); |
0626e664 NJ |
2016 | return ret; |
2017 | } | |
0626e664 NJ |
2018 | return 0; |
2019 | } | |
2020 | ||
2021 | static bool rdma_frwr_is_supported(struct ib_device_attr *attrs) | |
2022 | { | |
2023 | if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) | |
2024 | return false; | |
2025 | if (attrs->max_fast_reg_page_list_len == 0) | |
2026 | return false; | |
2027 | return true; | |
2028 | } | |
2029 | ||
2030 | static int smb_direct_handle_connect_request(struct rdma_cm_id *new_cm_id) | |
2031 | { | |
2032 | struct smb_direct_transport *t; | |
99b7650a | 2033 | int ret; |
0626e664 NJ |
2034 | |
2035 | if (!rdma_frwr_is_supported(&new_cm_id->device->attrs)) { | |
2036 | ksmbd_debug(RDMA, | |
070fb21e NJ |
2037 | "Fast Registration Work Requests is not supported. device capabilities=%llx\n", |
2038 | new_cm_id->device->attrs.device_cap_flags); | |
0626e664 NJ |
2039 | return -EPROTONOSUPPORT; |
2040 | } | |
2041 | ||
2042 | t = alloc_transport(new_cm_id); | |
2043 | if (!t) | |
2044 | return -ENOMEM; | |
2045 | ||
99b7650a HL |
2046 | ret = smb_direct_connect(t); |
2047 | if (ret) | |
2048 | goto out_err; | |
2049 | ||
0626e664 | 2050 | KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop, |
070fb21e | 2051 | KSMBD_TRANS(t)->conn, "ksmbd:r%u", |
cb097b3d | 2052 | smb_direct_port); |
0626e664 | 2053 | if (IS_ERR(KSMBD_TRANS(t)->handler)) { |
99b7650a | 2054 | ret = PTR_ERR(KSMBD_TRANS(t)->handler); |
bde1694a | 2055 | pr_err("Can't start thread\n"); |
99b7650a | 2056 | goto out_err; |
0626e664 NJ |
2057 | } |
2058 | ||
2059 | return 0; | |
99b7650a HL |
2060 | out_err: |
2061 | free_transport(t); | |
2062 | return ret; | |
0626e664 NJ |
2063 | } |
2064 | ||
2065 | static int smb_direct_listen_handler(struct rdma_cm_id *cm_id, | |
070fb21e | 2066 | struct rdma_cm_event *event) |
0626e664 NJ |
2067 | { |
2068 | switch (event->event) { | |
2069 | case RDMA_CM_EVENT_CONNECT_REQUEST: { | |
2070 | int ret = smb_direct_handle_connect_request(cm_id); | |
2071 | ||
2072 | if (ret) { | |
bde1694a | 2073 | pr_err("Can't create transport: %d\n", ret); |
0626e664 NJ |
2074 | return ret; |
2075 | } | |
2076 | ||
2077 | ksmbd_debug(RDMA, "Received connection request. cm_id=%p\n", | |
070fb21e | 2078 | cm_id); |
0626e664 NJ |
2079 | break; |
2080 | } | |
2081 | default: | |
bde1694a NJ |
2082 | pr_err("Unexpected listen event. cm_id=%p, event=%s (%d)\n", |
2083 | cm_id, rdma_event_msg(event->event), event->event); | |
0626e664 NJ |
2084 | break; |
2085 | } | |
2086 | return 0; | |
2087 | } | |
2088 | ||
2089 | static int smb_direct_listen(int port) | |
2090 | { | |
2091 | int ret; | |
2092 | struct rdma_cm_id *cm_id; | |
2093 | struct sockaddr_in sin = { | |
2094 | .sin_family = AF_INET, | |
2095 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
2096 | .sin_port = htons(port), | |
2097 | }; | |
2098 | ||
2099 | cm_id = rdma_create_id(&init_net, smb_direct_listen_handler, | |
070fb21e | 2100 | &smb_direct_listener, RDMA_PS_TCP, IB_QPT_RC); |
0626e664 | 2101 | if (IS_ERR(cm_id)) { |
bde1694a | 2102 | pr_err("Can't create cm id: %ld\n", PTR_ERR(cm_id)); |
0626e664 NJ |
2103 | return PTR_ERR(cm_id); |
2104 | } | |
2105 | ||
2106 | ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin); | |
2107 | if (ret) { | |
bde1694a | 2108 | pr_err("Can't bind: %d\n", ret); |
0626e664 NJ |
2109 | goto err; |
2110 | } | |
2111 | ||
2112 | smb_direct_listener.cm_id = cm_id; | |
2113 | ||
2114 | ret = rdma_listen(cm_id, 10); | |
2115 | if (ret) { | |
bde1694a | 2116 | pr_err("Can't listen: %d\n", ret); |
0626e664 NJ |
2117 | goto err; |
2118 | } | |
2119 | return 0; | |
2120 | err: | |
2121 | smb_direct_listener.cm_id = NULL; | |
2122 | rdma_destroy_id(cm_id); | |
2123 | return ret; | |
2124 | } | |
2125 | ||
31928a00 HL |
2126 | static int smb_direct_ib_client_add(struct ib_device *ib_dev) |
2127 | { | |
2128 | struct smb_direct_device *smb_dev; | |
2129 | ||
cb097b3d NJ |
2130 | /* Set 5445 port if device type is iWARP(No IB) */ |
2131 | if (ib_dev->node_type != RDMA_NODE_IB_CA) | |
2132 | smb_direct_port = SMB_DIRECT_PORT_IWARP; | |
2133 | ||
31928a00 HL |
2134 | if (!ib_dev->ops.get_netdev || |
2135 | !rdma_frwr_is_supported(&ib_dev->attrs)) | |
2136 | return 0; | |
2137 | ||
2138 | smb_dev = kzalloc(sizeof(*smb_dev), GFP_KERNEL); | |
2139 | if (!smb_dev) | |
2140 | return -ENOMEM; | |
2141 | smb_dev->ib_dev = ib_dev; | |
2142 | ||
2143 | write_lock(&smb_direct_device_lock); | |
2144 | list_add(&smb_dev->list, &smb_direct_device_list); | |
2145 | write_unlock(&smb_direct_device_lock); | |
2146 | ||
2147 | ksmbd_debug(RDMA, "ib device added: name %s\n", ib_dev->name); | |
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | static void smb_direct_ib_client_remove(struct ib_device *ib_dev, | |
2152 | void *client_data) | |
2153 | { | |
2154 | struct smb_direct_device *smb_dev, *tmp; | |
2155 | ||
2156 | write_lock(&smb_direct_device_lock); | |
2157 | list_for_each_entry_safe(smb_dev, tmp, &smb_direct_device_list, list) { | |
2158 | if (smb_dev->ib_dev == ib_dev) { | |
2159 | list_del(&smb_dev->list); | |
2160 | kfree(smb_dev); | |
2161 | break; | |
2162 | } | |
2163 | } | |
2164 | write_unlock(&smb_direct_device_lock); | |
2165 | } | |
2166 | ||
2167 | static struct ib_client smb_direct_ib_client = { | |
2168 | .name = "ksmbd_smb_direct_ib", | |
2169 | .add = smb_direct_ib_client_add, | |
2170 | .remove = smb_direct_ib_client_remove, | |
2171 | }; | |
2172 | ||
0626e664 NJ |
2173 | int ksmbd_rdma_init(void) |
2174 | { | |
2175 | int ret; | |
2176 | ||
2177 | smb_direct_listener.cm_id = NULL; | |
2178 | ||
31928a00 HL |
2179 | ret = ib_register_client(&smb_direct_ib_client); |
2180 | if (ret) { | |
2181 | pr_err("failed to ib_register_client\n"); | |
2182 | return ret; | |
2183 | } | |
2184 | ||
0626e664 NJ |
2185 | /* When a client is running out of send credits, the credits are |
2186 | * granted by the server's sending a packet using this queue. | |
2187 | * This avoids the situation that a clients cannot send packets | |
2188 | * for lack of credits | |
2189 | */ | |
2190 | smb_direct_wq = alloc_workqueue("ksmbd-smb_direct-wq", | |
070fb21e | 2191 | WQ_HIGHPRI | WQ_MEM_RECLAIM, 0); |
0626e664 NJ |
2192 | if (!smb_direct_wq) |
2193 | return -ENOMEM; | |
2194 | ||
cb097b3d | 2195 | ret = smb_direct_listen(smb_direct_port); |
0626e664 NJ |
2196 | if (ret) { |
2197 | destroy_workqueue(smb_direct_wq); | |
2198 | smb_direct_wq = NULL; | |
bde1694a | 2199 | pr_err("Can't listen: %d\n", ret); |
0626e664 NJ |
2200 | return ret; |
2201 | } | |
2202 | ||
2203 | ksmbd_debug(RDMA, "init RDMA listener. cm_id=%p\n", | |
070fb21e | 2204 | smb_direct_listener.cm_id); |
0626e664 NJ |
2205 | return 0; |
2206 | } | |
2207 | ||
31928a00 | 2208 | void ksmbd_rdma_destroy(void) |
0626e664 | 2209 | { |
31928a00 HL |
2210 | if (!smb_direct_listener.cm_id) |
2211 | return; | |
2212 | ||
2213 | ib_unregister_client(&smb_direct_ib_client); | |
2214 | rdma_destroy_id(smb_direct_listener.cm_id); | |
2215 | ||
0626e664 NJ |
2216 | smb_direct_listener.cm_id = NULL; |
2217 | ||
2218 | if (smb_direct_wq) { | |
0626e664 NJ |
2219 | destroy_workqueue(smb_direct_wq); |
2220 | smb_direct_wq = NULL; | |
2221 | } | |
0626e664 NJ |
2222 | } |
2223 | ||
03d8d4f1 HL |
2224 | bool ksmbd_rdma_capable_netdev(struct net_device *netdev) |
2225 | { | |
31928a00 HL |
2226 | struct smb_direct_device *smb_dev; |
2227 | int i; | |
03d8d4f1 HL |
2228 | bool rdma_capable = false; |
2229 | ||
31928a00 HL |
2230 | read_lock(&smb_direct_device_lock); |
2231 | list_for_each_entry(smb_dev, &smb_direct_device_list, list) { | |
2232 | for (i = 0; i < smb_dev->ib_dev->phys_port_cnt; i++) { | |
2233 | struct net_device *ndev; | |
2234 | ||
2235 | ndev = smb_dev->ib_dev->ops.get_netdev(smb_dev->ib_dev, | |
2236 | i + 1); | |
2237 | if (!ndev) | |
2238 | continue; | |
2239 | ||
2240 | if (ndev == netdev) { | |
2241 | dev_put(ndev); | |
2242 | rdma_capable = true; | |
2243 | goto out; | |
2244 | } | |
2245 | dev_put(ndev); | |
2246 | } | |
2247 | } | |
2248 | out: | |
2249 | read_unlock(&smb_direct_device_lock); | |
2250 | ||
2251 | if (rdma_capable == false) { | |
2252 | struct ib_device *ibdev; | |
2253 | ||
2254 | ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_UNKNOWN); | |
2255 | if (ibdev) { | |
2256 | if (rdma_frwr_is_supported(&ibdev->attrs)) | |
2257 | rdma_capable = true; | |
2258 | ib_device_put(ibdev); | |
2259 | } | |
03d8d4f1 | 2260 | } |
31928a00 | 2261 | |
03d8d4f1 HL |
2262 | return rdma_capable; |
2263 | } | |
2264 | ||
0626e664 NJ |
2265 | static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = { |
2266 | .prepare = smb_direct_prepare, | |
2267 | .disconnect = smb_direct_disconnect, | |
136dff3a | 2268 | .shutdown = smb_direct_shutdown, |
0626e664 NJ |
2269 | .writev = smb_direct_writev, |
2270 | .read = smb_direct_read, | |
2271 | .rdma_read = smb_direct_rdma_read, | |
2272 | .rdma_write = smb_direct_rdma_write, | |
2273 | }; |