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1 | /* |
2 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. | |
3 | * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. | |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | * | |
33 | * $Id: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $ | |
34 | */ | |
35 | #include <asm/io.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/smp_lock.h> | |
39 | #include <linux/delay.h> | |
40 | #include <linux/version.h> | |
41 | ||
42 | #include "iscsi_iser.h" | |
43 | ||
44 | #define ISCSI_ISER_MAX_CONN 8 | |
45 | #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \ | |
46 | ISER_QP_MAX_REQ_DTOS) * \ | |
47 | ISCSI_ISER_MAX_CONN) | |
48 | ||
49 | static void iser_cq_tasklet_fn(unsigned long data); | |
50 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context); | |
51 | static void iser_comp_error_worker(void *data); | |
52 | ||
53 | static void iser_cq_event_callback(struct ib_event *cause, void *context) | |
54 | { | |
55 | iser_err("got cq event %d \n", cause->event); | |
56 | } | |
57 | ||
58 | static void iser_qp_event_callback(struct ib_event *cause, void *context) | |
59 | { | |
60 | iser_err("got qp event %d\n",cause->event); | |
61 | } | |
62 | ||
63 | /** | |
64 | * iser_create_device_ib_res - creates Protection Domain (PD), Completion | |
65 | * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with | |
66 | * the adapator. | |
67 | * | |
68 | * returns 0 on success, -1 on failure | |
69 | */ | |
70 | static int iser_create_device_ib_res(struct iser_device *device) | |
71 | { | |
72 | device->pd = ib_alloc_pd(device->ib_device); | |
73 | if (IS_ERR(device->pd)) | |
74 | goto pd_err; | |
75 | ||
76 | device->cq = ib_create_cq(device->ib_device, | |
77 | iser_cq_callback, | |
78 | iser_cq_event_callback, | |
79 | (void *)device, | |
80 | ISER_MAX_CQ_LEN); | |
81 | if (IS_ERR(device->cq)) | |
82 | goto cq_err; | |
83 | ||
84 | if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP)) | |
85 | goto cq_arm_err; | |
86 | ||
87 | tasklet_init(&device->cq_tasklet, | |
88 | iser_cq_tasklet_fn, | |
89 | (unsigned long)device); | |
90 | ||
91 | device->mr = ib_get_dma_mr(device->pd, | |
92 | IB_ACCESS_LOCAL_WRITE); | |
93 | if (IS_ERR(device->mr)) | |
94 | goto dma_mr_err; | |
95 | ||
96 | return 0; | |
97 | ||
98 | dma_mr_err: | |
99 | tasklet_kill(&device->cq_tasklet); | |
100 | cq_arm_err: | |
101 | ib_destroy_cq(device->cq); | |
102 | cq_err: | |
103 | ib_dealloc_pd(device->pd); | |
104 | pd_err: | |
105 | iser_err("failed to allocate an IB resource\n"); | |
106 | return -1; | |
107 | } | |
108 | ||
109 | /** | |
110 | * iser_free_device_ib_res - destory/dealloc/dereg the DMA MR, | |
111 | * CQ and PD created with the device associated with the adapator. | |
112 | */ | |
113 | static void iser_free_device_ib_res(struct iser_device *device) | |
114 | { | |
115 | BUG_ON(device->mr == NULL); | |
116 | ||
117 | tasklet_kill(&device->cq_tasklet); | |
118 | ||
119 | (void)ib_dereg_mr(device->mr); | |
120 | (void)ib_destroy_cq(device->cq); | |
121 | (void)ib_dealloc_pd(device->pd); | |
122 | ||
123 | device->mr = NULL; | |
124 | device->cq = NULL; | |
125 | device->pd = NULL; | |
126 | } | |
127 | ||
128 | /** | |
129 | * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) | |
130 | * | |
131 | * returns 0 on success, -1 on failure | |
132 | */ | |
133 | static int iser_create_ib_conn_res(struct iser_conn *ib_conn) | |
134 | { | |
135 | struct iser_device *device; | |
136 | struct ib_qp_init_attr init_attr; | |
137 | int ret; | |
138 | struct ib_fmr_pool_param params; | |
139 | ||
140 | BUG_ON(ib_conn->device == NULL); | |
141 | ||
142 | device = ib_conn->device; | |
143 | ||
144 | ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + | |
145 | (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), | |
146 | GFP_KERNEL); | |
147 | if (!ib_conn->page_vec) { | |
148 | ret = -ENOMEM; | |
149 | goto alloc_err; | |
150 | } | |
151 | ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); | |
152 | ||
153 | params.page_shift = PAGE_SHIFT; | |
154 | /* when the first/last SG element are not start/end * | |
155 | * page aligned, the map whould be of N+1 pages */ | |
156 | params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; | |
157 | /* make the pool size twice the max number of SCSI commands * | |
158 | * the ML is expected to queue, watermark for unmap at 50% */ | |
159 | params.pool_size = ISCSI_XMIT_CMDS_MAX * 2; | |
160 | params.dirty_watermark = ISCSI_XMIT_CMDS_MAX; | |
161 | params.cache = 0; | |
162 | params.flush_function = NULL; | |
163 | params.access = (IB_ACCESS_LOCAL_WRITE | | |
164 | IB_ACCESS_REMOTE_WRITE | | |
165 | IB_ACCESS_REMOTE_READ); | |
166 | ||
167 | ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); | |
168 | if (IS_ERR(ib_conn->fmr_pool)) { | |
169 | ret = PTR_ERR(ib_conn->fmr_pool); | |
170 | goto fmr_pool_err; | |
171 | } | |
172 | ||
173 | memset(&init_attr, 0, sizeof init_attr); | |
174 | ||
175 | init_attr.event_handler = iser_qp_event_callback; | |
176 | init_attr.qp_context = (void *)ib_conn; | |
177 | init_attr.send_cq = device->cq; | |
178 | init_attr.recv_cq = device->cq; | |
179 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; | |
180 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; | |
181 | init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; | |
182 | init_attr.cap.max_recv_sge = 2; | |
183 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
184 | init_attr.qp_type = IB_QPT_RC; | |
185 | ||
186 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); | |
187 | if (ret) | |
188 | goto qp_err; | |
189 | ||
190 | ib_conn->qp = ib_conn->cma_id->qp; | |
191 | iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", | |
192 | ib_conn, ib_conn->cma_id, | |
193 | ib_conn->fmr_pool, ib_conn->cma_id->qp); | |
194 | return ret; | |
195 | ||
196 | qp_err: | |
197 | (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); | |
198 | fmr_pool_err: | |
199 | kfree(ib_conn->page_vec); | |
200 | alloc_err: | |
201 | iser_err("unable to alloc mem or create resource, err %d\n", ret); | |
202 | return ret; | |
203 | } | |
204 | ||
205 | /** | |
206 | * releases the FMR pool, QP and CMA ID objects, returns 0 on success, | |
207 | * -1 on failure | |
208 | */ | |
209 | static int iser_free_ib_conn_res(struct iser_conn *ib_conn) | |
210 | { | |
211 | BUG_ON(ib_conn == NULL); | |
212 | ||
213 | iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", | |
214 | ib_conn, ib_conn->cma_id, | |
215 | ib_conn->fmr_pool, ib_conn->qp); | |
216 | ||
217 | /* qp is created only once both addr & route are resolved */ | |
218 | if (ib_conn->fmr_pool != NULL) | |
219 | ib_destroy_fmr_pool(ib_conn->fmr_pool); | |
220 | ||
221 | if (ib_conn->qp != NULL) | |
222 | rdma_destroy_qp(ib_conn->cma_id); | |
223 | ||
224 | if (ib_conn->cma_id != NULL) | |
225 | rdma_destroy_id(ib_conn->cma_id); | |
226 | ||
227 | ib_conn->fmr_pool = NULL; | |
228 | ib_conn->qp = NULL; | |
229 | ib_conn->cma_id = NULL; | |
230 | kfree(ib_conn->page_vec); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | /** | |
236 | * based on the resolved device node GUID see if there already allocated | |
237 | * device for this device. If there's no such, create one. | |
238 | */ | |
239 | static | |
240 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
241 | { | |
242 | struct list_head *p_list; | |
243 | struct iser_device *device = NULL; | |
244 | ||
245 | mutex_lock(&ig.device_list_mutex); | |
246 | ||
247 | p_list = ig.device_list.next; | |
248 | while (p_list != &ig.device_list) { | |
249 | device = list_entry(p_list, struct iser_device, ig_list); | |
250 | /* find if there's a match using the node GUID */ | |
251 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
252 | break; | |
253 | } | |
254 | ||
255 | if (device == NULL) { | |
256 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
257 | if (device == NULL) | |
258 | goto out; | |
259 | /* assign this device to the device */ | |
260 | device->ib_device = cma_id->device; | |
261 | /* init the device and link it into ig device list */ | |
262 | if (iser_create_device_ib_res(device)) { | |
263 | kfree(device); | |
264 | device = NULL; | |
265 | goto out; | |
266 | } | |
267 | list_add(&device->ig_list, &ig.device_list); | |
268 | } | |
269 | out: | |
270 | BUG_ON(device == NULL); | |
271 | device->refcount++; | |
272 | mutex_unlock(&ig.device_list_mutex); | |
273 | return device; | |
274 | } | |
275 | ||
276 | /* if there's no demand for this device, release it */ | |
277 | static void iser_device_try_release(struct iser_device *device) | |
278 | { | |
279 | mutex_lock(&ig.device_list_mutex); | |
280 | device->refcount--; | |
281 | iser_err("device %p refcount %d\n",device,device->refcount); | |
282 | if (!device->refcount) { | |
283 | iser_free_device_ib_res(device); | |
284 | list_del(&device->ig_list); | |
285 | kfree(device); | |
286 | } | |
287 | mutex_unlock(&ig.device_list_mutex); | |
288 | } | |
289 | ||
290 | int iser_conn_state_comp(struct iser_conn *ib_conn, | |
291 | enum iser_ib_conn_state comp) | |
292 | { | |
293 | int ret; | |
294 | ||
295 | spin_lock_bh(&ib_conn->lock); | |
296 | ret = (ib_conn->state == comp); | |
297 | spin_unlock_bh(&ib_conn->lock); | |
298 | return ret; | |
299 | } | |
300 | ||
301 | static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, | |
302 | enum iser_ib_conn_state comp, | |
303 | enum iser_ib_conn_state exch) | |
304 | { | |
305 | int ret; | |
306 | ||
307 | spin_lock_bh(&ib_conn->lock); | |
308 | if ((ret = (ib_conn->state == comp))) | |
309 | ib_conn->state = exch; | |
310 | spin_unlock_bh(&ib_conn->lock); | |
311 | return ret; | |
312 | } | |
313 | ||
314 | /** | |
315 | * triggers start of the disconnect procedures and wait for them to be done | |
316 | */ | |
317 | void iser_conn_terminate(struct iser_conn *ib_conn) | |
318 | { | |
319 | int err = 0; | |
320 | ||
321 | /* change the ib conn state only if the conn is UP, however always call | |
322 | * rdma_disconnect since this is the only way to cause the CMA to change | |
323 | * the QP state to ERROR | |
324 | */ | |
325 | ||
326 | iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); | |
327 | err = rdma_disconnect(ib_conn->cma_id); | |
328 | if (err) | |
329 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
330 | ib_conn,err); | |
331 | ||
332 | wait_event_interruptible(ib_conn->wait, | |
333 | ib_conn->state == ISER_CONN_DOWN); | |
334 | ||
335 | iser_conn_release(ib_conn); | |
336 | } | |
337 | ||
338 | static void iser_connect_error(struct rdma_cm_id *cma_id) | |
339 | { | |
340 | struct iser_conn *ib_conn; | |
341 | ib_conn = (struct iser_conn *)cma_id->context; | |
342 | ||
343 | ib_conn->state = ISER_CONN_DOWN; | |
344 | wake_up_interruptible(&ib_conn->wait); | |
345 | } | |
346 | ||
347 | static void iser_addr_handler(struct rdma_cm_id *cma_id) | |
348 | { | |
349 | struct iser_device *device; | |
350 | struct iser_conn *ib_conn; | |
351 | int ret; | |
352 | ||
353 | device = iser_device_find_by_ib_device(cma_id); | |
354 | ib_conn = (struct iser_conn *)cma_id->context; | |
355 | ib_conn->device = device; | |
356 | ||
357 | ret = rdma_resolve_route(cma_id, 1000); | |
358 | if (ret) { | |
359 | iser_err("resolve route failed: %d\n", ret); | |
360 | iser_connect_error(cma_id); | |
361 | } | |
362 | return; | |
363 | } | |
364 | ||
365 | static void iser_route_handler(struct rdma_cm_id *cma_id) | |
366 | { | |
367 | struct rdma_conn_param conn_param; | |
368 | int ret; | |
369 | ||
370 | ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); | |
371 | if (ret) | |
372 | goto failure; | |
373 | ||
374 | iser_dbg("path.mtu is %d setting it to %d\n", | |
375 | cma_id->route.path_rec->mtu, IB_MTU_1024); | |
376 | ||
377 | /* we must set the MTU to 1024 as this is what the target is assuming */ | |
378 | if (cma_id->route.path_rec->mtu > IB_MTU_1024) | |
379 | cma_id->route.path_rec->mtu = IB_MTU_1024; | |
380 | ||
381 | memset(&conn_param, 0, sizeof conn_param); | |
382 | conn_param.responder_resources = 4; | |
383 | conn_param.initiator_depth = 1; | |
384 | conn_param.retry_count = 7; | |
385 | conn_param.rnr_retry_count = 6; | |
386 | ||
387 | ret = rdma_connect(cma_id, &conn_param); | |
388 | if (ret) { | |
389 | iser_err("failure connecting: %d\n", ret); | |
390 | goto failure; | |
391 | } | |
392 | ||
393 | return; | |
394 | failure: | |
395 | iser_connect_error(cma_id); | |
396 | } | |
397 | ||
398 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
399 | { | |
400 | struct iser_conn *ib_conn; | |
401 | ||
402 | ib_conn = (struct iser_conn *)cma_id->context; | |
403 | ib_conn->state = ISER_CONN_UP; | |
404 | wake_up_interruptible(&ib_conn->wait); | |
405 | } | |
406 | ||
407 | static void iser_disconnected_handler(struct rdma_cm_id *cma_id) | |
408 | { | |
409 | struct iser_conn *ib_conn; | |
410 | ||
411 | ib_conn = (struct iser_conn *)cma_id->context; | |
412 | ib_conn->disc_evt_flag = 1; | |
413 | ||
414 | /* getting here when the state is UP means that the conn is being * | |
415 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
416 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
417 | ISER_CONN_TERMINATING)) | |
418 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
419 | ISCSI_ERR_CONN_FAILED); | |
420 | ||
421 | /* Complete the termination process if no posts are pending */ | |
422 | if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && | |
423 | (atomic_read(&ib_conn->post_send_buf_count) == 0)) { | |
424 | ib_conn->state = ISER_CONN_DOWN; | |
425 | wake_up_interruptible(&ib_conn->wait); | |
426 | } | |
427 | } | |
428 | ||
429 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
430 | { | |
431 | int ret = 0; | |
432 | ||
433 | iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); | |
434 | ||
435 | switch (event->event) { | |
436 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
437 | iser_addr_handler(cma_id); | |
438 | break; | |
439 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
440 | iser_route_handler(cma_id); | |
441 | break; | |
442 | case RDMA_CM_EVENT_ESTABLISHED: | |
443 | iser_connected_handler(cma_id); | |
444 | break; | |
445 | case RDMA_CM_EVENT_ADDR_ERROR: | |
446 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
447 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
448 | case RDMA_CM_EVENT_UNREACHABLE: | |
449 | case RDMA_CM_EVENT_REJECTED: | |
450 | iser_err("event: %d, error: %d\n", event->event, event->status); | |
451 | iser_connect_error(cma_id); | |
452 | break; | |
453 | case RDMA_CM_EVENT_DISCONNECTED: | |
454 | iser_disconnected_handler(cma_id); | |
455 | break; | |
456 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
457 | BUG(); | |
458 | break; | |
459 | case RDMA_CM_EVENT_CONNECT_RESPONSE: | |
460 | BUG(); | |
461 | break; | |
462 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
463 | default: | |
464 | break; | |
465 | } | |
466 | return ret; | |
467 | } | |
468 | ||
469 | int iser_conn_init(struct iser_conn **ibconn) | |
470 | { | |
471 | struct iser_conn *ib_conn; | |
472 | ||
473 | ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL); | |
474 | if (!ib_conn) { | |
475 | iser_err("can't alloc memory for struct iser_conn\n"); | |
476 | return -ENOMEM; | |
477 | } | |
478 | ib_conn->state = ISER_CONN_INIT; | |
479 | init_waitqueue_head(&ib_conn->wait); | |
480 | atomic_set(&ib_conn->post_recv_buf_count, 0); | |
481 | atomic_set(&ib_conn->post_send_buf_count, 0); | |
482 | INIT_WORK(&ib_conn->comperror_work, iser_comp_error_worker, | |
483 | ib_conn); | |
484 | INIT_LIST_HEAD(&ib_conn->conn_list); | |
485 | spin_lock_init(&ib_conn->lock); | |
486 | ||
487 | *ibconn = ib_conn; | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /** | |
492 | * starts the process of connecting to the target | |
493 | * sleeps untill the connection is established or rejected | |
494 | */ | |
495 | int iser_connect(struct iser_conn *ib_conn, | |
496 | struct sockaddr_in *src_addr, | |
497 | struct sockaddr_in *dst_addr, | |
498 | int non_blocking) | |
499 | { | |
500 | struct sockaddr *src, *dst; | |
501 | int err = 0; | |
502 | ||
503 | sprintf(ib_conn->name,"%d.%d.%d.%d:%d", | |
504 | NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port); | |
505 | ||
506 | /* the device is known only --after-- address resolution */ | |
507 | ib_conn->device = NULL; | |
508 | ||
509 | iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n", | |
510 | NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port); | |
511 | ||
512 | ib_conn->state = ISER_CONN_PENDING; | |
513 | ||
514 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, | |
515 | (void *)ib_conn, | |
516 | RDMA_PS_TCP); | |
517 | if (IS_ERR(ib_conn->cma_id)) { | |
518 | err = PTR_ERR(ib_conn->cma_id); | |
519 | iser_err("rdma_create_id failed: %d\n", err); | |
520 | goto id_failure; | |
521 | } | |
522 | ||
523 | src = (struct sockaddr *)src_addr; | |
524 | dst = (struct sockaddr *)dst_addr; | |
525 | err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); | |
526 | if (err) { | |
527 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
528 | goto addr_failure; | |
529 | } | |
530 | ||
531 | if (!non_blocking) { | |
532 | wait_event_interruptible(ib_conn->wait, | |
533 | (ib_conn->state != ISER_CONN_PENDING)); | |
534 | ||
535 | if (ib_conn->state != ISER_CONN_UP) { | |
536 | err = -EIO; | |
537 | goto connect_failure; | |
538 | } | |
539 | } | |
540 | ||
541 | mutex_lock(&ig.connlist_mutex); | |
542 | list_add(&ib_conn->conn_list, &ig.connlist); | |
543 | mutex_unlock(&ig.connlist_mutex); | |
544 | return 0; | |
545 | ||
546 | id_failure: | |
547 | ib_conn->cma_id = NULL; | |
548 | addr_failure: | |
549 | ib_conn->state = ISER_CONN_DOWN; | |
550 | connect_failure: | |
551 | iser_conn_release(ib_conn); | |
552 | return err; | |
553 | } | |
554 | ||
555 | /** | |
556 | * Frees all conn objects and deallocs conn descriptor | |
557 | */ | |
558 | void iser_conn_release(struct iser_conn *ib_conn) | |
559 | { | |
560 | struct iser_device *device = ib_conn->device; | |
561 | ||
562 | BUG_ON(ib_conn->state != ISER_CONN_DOWN); | |
563 | ||
564 | mutex_lock(&ig.connlist_mutex); | |
565 | list_del(&ib_conn->conn_list); | |
566 | mutex_unlock(&ig.connlist_mutex); | |
567 | ||
568 | iser_free_ib_conn_res(ib_conn); | |
569 | ib_conn->device = NULL; | |
570 | /* on EVENT_ADDR_ERROR there's no device yet for this conn */ | |
571 | if (device != NULL) | |
572 | iser_device_try_release(device); | |
573 | kfree(ib_conn); | |
574 | } | |
575 | ||
576 | ||
577 | /** | |
578 | * iser_reg_page_vec - Register physical memory | |
579 | * | |
580 | * returns: 0 on success, errno code on failure | |
581 | */ | |
582 | int iser_reg_page_vec(struct iser_conn *ib_conn, | |
583 | struct iser_page_vec *page_vec, | |
584 | struct iser_mem_reg *mem_reg) | |
585 | { | |
586 | struct ib_pool_fmr *mem; | |
587 | u64 io_addr; | |
588 | u64 *page_list; | |
589 | int status; | |
590 | ||
591 | page_list = page_vec->pages; | |
592 | io_addr = page_list[0]; | |
593 | ||
594 | mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, | |
595 | page_list, | |
596 | page_vec->length, | |
adfaa888 | 597 | io_addr); |
1cfa0a75 OG |
598 | |
599 | if (IS_ERR(mem)) { | |
600 | status = (int)PTR_ERR(mem); | |
601 | iser_err("ib_fmr_pool_map_phys failed: %d\n", status); | |
602 | return status; | |
603 | } | |
604 | ||
605 | mem_reg->lkey = mem->fmr->lkey; | |
606 | mem_reg->rkey = mem->fmr->rkey; | |
607 | mem_reg->len = page_vec->length * PAGE_SIZE; | |
608 | mem_reg->va = io_addr; | |
609 | mem_reg->mem_h = (void *)mem; | |
610 | ||
611 | mem_reg->va += page_vec->offset; | |
612 | mem_reg->len = page_vec->data_size; | |
613 | ||
614 | iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " | |
615 | "entry[0]: (0x%08lx,%ld)] -> " | |
616 | "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", | |
617 | page_vec, page_vec->length, | |
618 | (unsigned long)page_vec->pages[0], | |
619 | (unsigned long)page_vec->data_size, | |
620 | (unsigned int)mem_reg->lkey, mem_reg->mem_h, | |
621 | (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /** | |
626 | * Unregister (previosuly registered) memory. | |
627 | */ | |
628 | void iser_unreg_mem(struct iser_mem_reg *reg) | |
629 | { | |
630 | int ret; | |
631 | ||
632 | iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); | |
633 | ||
634 | ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); | |
635 | if (ret) | |
636 | iser_err("ib_fmr_pool_unmap failed %d\n", ret); | |
637 | ||
638 | reg->mem_h = NULL; | |
639 | } | |
640 | ||
641 | /** | |
642 | * iser_dto_to_iov - builds IOV from a dto descriptor | |
643 | */ | |
644 | static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) | |
645 | { | |
646 | int i; | |
647 | struct ib_sge *sge; | |
648 | struct iser_regd_buf *regd_buf; | |
649 | ||
650 | if (dto->regd_vector_len > iov_len) { | |
651 | iser_err("iov size %d too small for posting dto of len %d\n", | |
652 | iov_len, dto->regd_vector_len); | |
653 | BUG(); | |
654 | } | |
655 | ||
656 | for (i = 0; i < dto->regd_vector_len; i++) { | |
657 | sge = &iov[i]; | |
658 | regd_buf = dto->regd[i]; | |
659 | ||
660 | sge->addr = regd_buf->reg.va; | |
661 | sge->length = regd_buf->reg.len; | |
662 | sge->lkey = regd_buf->reg.lkey; | |
663 | ||
664 | if (dto->used_sz[i] > 0) /* Adjust size */ | |
665 | sge->length = dto->used_sz[i]; | |
666 | ||
667 | /* offset and length should not exceed the regd buf length */ | |
668 | if (sge->length + dto->offset[i] > regd_buf->reg.len) { | |
669 | iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" | |
670 | "%ld in dto:0x%p [%d], va:0x%08lX\n", | |
671 | (unsigned long)sge->length, dto->offset[i], | |
672 | (unsigned long)regd_buf->reg.len, dto, i, | |
673 | (unsigned long)sge->addr); | |
674 | BUG(); | |
675 | } | |
676 | ||
677 | sge->addr += dto->offset[i]; /* Adjust offset */ | |
678 | } | |
679 | } | |
680 | ||
681 | /** | |
682 | * iser_post_recv - Posts a receive buffer. | |
683 | * | |
684 | * returns 0 on success, -1 on failure | |
685 | */ | |
686 | int iser_post_recv(struct iser_desc *rx_desc) | |
687 | { | |
688 | int ib_ret, ret_val = 0; | |
689 | struct ib_recv_wr recv_wr, *recv_wr_failed; | |
690 | struct ib_sge iov[2]; | |
691 | struct iser_conn *ib_conn; | |
692 | struct iser_dto *recv_dto = &rx_desc->dto; | |
693 | ||
694 | /* Retrieve conn */ | |
695 | ib_conn = recv_dto->conn->ib_conn; | |
696 | ||
697 | iser_dto_to_iov(recv_dto, iov, 2); | |
698 | ||
699 | recv_wr.next = NULL; | |
700 | recv_wr.sg_list = iov; | |
701 | recv_wr.num_sge = recv_dto->regd_vector_len; | |
702 | recv_wr.wr_id = (unsigned long)rx_desc; | |
703 | ||
704 | atomic_inc(&ib_conn->post_recv_buf_count); | |
705 | ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed); | |
706 | if (ib_ret) { | |
707 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
708 | atomic_dec(&ib_conn->post_recv_buf_count); | |
709 | ret_val = -1; | |
710 | } | |
711 | ||
712 | return ret_val; | |
713 | } | |
714 | ||
715 | /** | |
716 | * iser_start_send - Initiate a Send DTO operation | |
717 | * | |
718 | * returns 0 on success, -1 on failure | |
719 | */ | |
720 | int iser_post_send(struct iser_desc *tx_desc) | |
721 | { | |
722 | int ib_ret, ret_val = 0; | |
723 | struct ib_send_wr send_wr, *send_wr_failed; | |
724 | struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; | |
725 | struct iser_conn *ib_conn; | |
726 | struct iser_dto *dto = &tx_desc->dto; | |
727 | ||
728 | ib_conn = dto->conn->ib_conn; | |
729 | ||
730 | iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); | |
731 | ||
732 | send_wr.next = NULL; | |
733 | send_wr.wr_id = (unsigned long)tx_desc; | |
734 | send_wr.sg_list = iov; | |
735 | send_wr.num_sge = dto->regd_vector_len; | |
736 | send_wr.opcode = IB_WR_SEND; | |
737 | send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0; | |
738 | ||
739 | atomic_inc(&ib_conn->post_send_buf_count); | |
740 | ||
741 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); | |
742 | if (ib_ret) { | |
743 | iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", | |
744 | dto, dto->regd_vector_len); | |
745 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); | |
746 | atomic_dec(&ib_conn->post_send_buf_count); | |
747 | ret_val = -1; | |
748 | } | |
749 | ||
750 | return ret_val; | |
751 | } | |
752 | ||
753 | static void iser_comp_error_worker(void *data) | |
754 | { | |
755 | struct iser_conn *ib_conn = data; | |
756 | ||
757 | /* getting here when the state is UP means that the conn is being * | |
758 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
759 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
760 | ISER_CONN_TERMINATING)) | |
761 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
762 | ISCSI_ERR_CONN_FAILED); | |
763 | ||
764 | /* complete the termination process if disconnect event was delivered * | |
765 | * note there are no more non completed posts to the QP */ | |
766 | if (ib_conn->disc_evt_flag) { | |
767 | ib_conn->state = ISER_CONN_DOWN; | |
768 | wake_up_interruptible(&ib_conn->wait); | |
769 | } | |
770 | } | |
771 | ||
772 | static void iser_handle_comp_error(struct iser_desc *desc) | |
773 | { | |
774 | struct iser_dto *dto = &desc->dto; | |
775 | struct iser_conn *ib_conn = dto->conn->ib_conn; | |
776 | ||
777 | iser_dto_buffs_release(dto); | |
778 | ||
779 | if (desc->type == ISCSI_RX) { | |
780 | kfree(desc->data); | |
781 | kmem_cache_free(ig.desc_cache, desc); | |
782 | atomic_dec(&ib_conn->post_recv_buf_count); | |
783 | } else { /* type is TX control/command/dataout */ | |
784 | if (desc->type == ISCSI_TX_DATAOUT) | |
785 | kmem_cache_free(ig.desc_cache, desc); | |
786 | atomic_dec(&ib_conn->post_send_buf_count); | |
787 | } | |
788 | ||
789 | if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && | |
790 | atomic_read(&ib_conn->post_send_buf_count) == 0) | |
791 | schedule_work(&ib_conn->comperror_work); | |
792 | } | |
793 | ||
794 | static void iser_cq_tasklet_fn(unsigned long data) | |
795 | { | |
796 | struct iser_device *device = (struct iser_device *)data; | |
797 | struct ib_cq *cq = device->cq; | |
798 | struct ib_wc wc; | |
799 | struct iser_desc *desc; | |
800 | unsigned long xfer_len; | |
801 | ||
802 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
803 | desc = (struct iser_desc *) (unsigned long) wc.wr_id; | |
804 | BUG_ON(desc == NULL); | |
805 | ||
806 | if (wc.status == IB_WC_SUCCESS) { | |
807 | if (desc->type == ISCSI_RX) { | |
808 | xfer_len = (unsigned long)wc.byte_len; | |
809 | iser_rcv_completion(desc, xfer_len); | |
810 | } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ | |
811 | iser_snd_completion(desc); | |
812 | } else { | |
813 | iser_err("comp w. error op %d status %d\n",desc->type,wc.status); | |
814 | iser_handle_comp_error(desc); | |
815 | } | |
816 | } | |
817 | /* #warning "it is assumed here that arming CQ only once its empty" * | |
818 | * " would not cause interrupts to be missed" */ | |
819 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
820 | } | |
821 | ||
822 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
823 | { | |
824 | struct iser_device *device = (struct iser_device *)cq_context; | |
825 | ||
826 | tasklet_schedule(&device->cq_tasklet); | |
827 | } |