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1cfa0a75 OG |
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. | |
1cfa0a75 | 32 | */ |
1cfa0a75 OG |
33 | #include <linux/kernel.h> |
34 | #include <linux/module.h> | |
1cfa0a75 | 35 | #include <linux/delay.h> |
1cfa0a75 OG |
36 | |
37 | #include "iscsi_iser.h" | |
38 | ||
39 | #define ISCSI_ISER_MAX_CONN 8 | |
78ad0a34 OG |
40 | #define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
41 | #define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) | |
1cfa0a75 OG |
42 | |
43 | static void iser_cq_tasklet_fn(unsigned long data); | |
44 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context); | |
1cfa0a75 OG |
45 | |
46 | static void iser_cq_event_callback(struct ib_event *cause, void *context) | |
47 | { | |
48 | iser_err("got cq event %d \n", cause->event); | |
49 | } | |
50 | ||
51 | static void iser_qp_event_callback(struct ib_event *cause, void *context) | |
52 | { | |
53 | iser_err("got qp event %d\n",cause->event); | |
54 | } | |
55 | ||
56 | /** | |
57 | * iser_create_device_ib_res - creates Protection Domain (PD), Completion | |
58 | * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with | |
59 | * the adapator. | |
60 | * | |
61 | * returns 0 on success, -1 on failure | |
62 | */ | |
63 | static int iser_create_device_ib_res(struct iser_device *device) | |
64 | { | |
65 | device->pd = ib_alloc_pd(device->ib_device); | |
66 | if (IS_ERR(device->pd)) | |
67 | goto pd_err; | |
68 | ||
78ad0a34 | 69 | device->rx_cq = ib_create_cq(device->ib_device, |
1cfa0a75 OG |
70 | iser_cq_callback, |
71 | iser_cq_event_callback, | |
72 | (void *)device, | |
78ad0a34 OG |
73 | ISER_MAX_RX_CQ_LEN, 0); |
74 | if (IS_ERR(device->rx_cq)) | |
75 | goto rx_cq_err; | |
1cfa0a75 | 76 | |
78ad0a34 OG |
77 | device->tx_cq = ib_create_cq(device->ib_device, |
78 | NULL, iser_cq_event_callback, | |
79 | (void *)device, | |
80 | ISER_MAX_TX_CQ_LEN, 0); | |
81 | ||
82 | if (IS_ERR(device->tx_cq)) | |
83 | goto tx_cq_err; | |
84 | ||
85 | if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) | |
1cfa0a75 OG |
86 | goto cq_arm_err; |
87 | ||
88 | tasklet_init(&device->cq_tasklet, | |
89 | iser_cq_tasklet_fn, | |
90 | (unsigned long)device); | |
91 | ||
d8111028 EZ |
92 | device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
93 | IB_ACCESS_REMOTE_WRITE | | |
94 | IB_ACCESS_REMOTE_READ); | |
1cfa0a75 OG |
95 | if (IS_ERR(device->mr)) |
96 | goto dma_mr_err; | |
97 | ||
98 | return 0; | |
99 | ||
100 | dma_mr_err: | |
101 | tasklet_kill(&device->cq_tasklet); | |
102 | cq_arm_err: | |
78ad0a34 OG |
103 | ib_destroy_cq(device->tx_cq); |
104 | tx_cq_err: | |
105 | ib_destroy_cq(device->rx_cq); | |
106 | rx_cq_err: | |
1cfa0a75 OG |
107 | ib_dealloc_pd(device->pd); |
108 | pd_err: | |
109 | iser_err("failed to allocate an IB resource\n"); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | /** | |
38dc732f | 114 | * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
1cfa0a75 OG |
115 | * CQ and PD created with the device associated with the adapator. |
116 | */ | |
117 | static void iser_free_device_ib_res(struct iser_device *device) | |
118 | { | |
119 | BUG_ON(device->mr == NULL); | |
120 | ||
121 | tasklet_kill(&device->cq_tasklet); | |
122 | ||
123 | (void)ib_dereg_mr(device->mr); | |
78ad0a34 OG |
124 | (void)ib_destroy_cq(device->tx_cq); |
125 | (void)ib_destroy_cq(device->rx_cq); | |
1cfa0a75 OG |
126 | (void)ib_dealloc_pd(device->pd); |
127 | ||
128 | device->mr = NULL; | |
78ad0a34 OG |
129 | device->tx_cq = NULL; |
130 | device->rx_cq = NULL; | |
1cfa0a75 OG |
131 | device->pd = NULL; |
132 | } | |
133 | ||
134 | /** | |
135 | * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) | |
136 | * | |
137 | * returns 0 on success, -1 on failure | |
138 | */ | |
139 | static int iser_create_ib_conn_res(struct iser_conn *ib_conn) | |
140 | { | |
141 | struct iser_device *device; | |
142 | struct ib_qp_init_attr init_attr; | |
bcc60c38 | 143 | int ret = -ENOMEM; |
1cfa0a75 OG |
144 | struct ib_fmr_pool_param params; |
145 | ||
146 | BUG_ON(ib_conn->device == NULL); | |
147 | ||
148 | device = ib_conn->device; | |
149 | ||
bcc60c38 OG |
150 | ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
151 | if (!ib_conn->login_buf) { | |
152 | goto alloc_err; | |
153 | ret = -ENOMEM; | |
154 | } | |
155 | ||
156 | ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, | |
157 | (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, | |
158 | DMA_FROM_DEVICE); | |
159 | ||
1cfa0a75 OG |
160 | ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + |
161 | (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), | |
162 | GFP_KERNEL); | |
163 | if (!ib_conn->page_vec) { | |
164 | ret = -ENOMEM; | |
165 | goto alloc_err; | |
166 | } | |
167 | ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); | |
168 | ||
8dfa0876 | 169 | params.page_shift = SHIFT_4K; |
1cfa0a75 OG |
170 | /* when the first/last SG element are not start/end * |
171 | * page aligned, the map whould be of N+1 pages */ | |
172 | params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; | |
173 | /* make the pool size twice the max number of SCSI commands * | |
174 | * the ML is expected to queue, watermark for unmap at 50% */ | |
1548271e MC |
175 | params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; |
176 | params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; | |
1cfa0a75 OG |
177 | params.cache = 0; |
178 | params.flush_function = NULL; | |
179 | params.access = (IB_ACCESS_LOCAL_WRITE | | |
180 | IB_ACCESS_REMOTE_WRITE | | |
181 | IB_ACCESS_REMOTE_READ); | |
182 | ||
183 | ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); | |
184 | if (IS_ERR(ib_conn->fmr_pool)) { | |
185 | ret = PTR_ERR(ib_conn->fmr_pool); | |
186 | goto fmr_pool_err; | |
187 | } | |
188 | ||
189 | memset(&init_attr, 0, sizeof init_attr); | |
190 | ||
191 | init_attr.event_handler = iser_qp_event_callback; | |
192 | init_attr.qp_context = (void *)ib_conn; | |
78ad0a34 OG |
193 | init_attr.send_cq = device->tx_cq; |
194 | init_attr.recv_cq = device->rx_cq; | |
1cfa0a75 OG |
195 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; |
196 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; | |
f19624aa | 197 | init_attr.cap.max_send_sge = 2; |
bcc60c38 | 198 | init_attr.cap.max_recv_sge = 1; |
1cfa0a75 OG |
199 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
200 | init_attr.qp_type = IB_QPT_RC; | |
201 | ||
202 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); | |
203 | if (ret) | |
204 | goto qp_err; | |
205 | ||
206 | ib_conn->qp = ib_conn->cma_id->qp; | |
207 | iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", | |
208 | ib_conn, ib_conn->cma_id, | |
209 | ib_conn->fmr_pool, ib_conn->cma_id->qp); | |
210 | return ret; | |
211 | ||
212 | qp_err: | |
213 | (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); | |
214 | fmr_pool_err: | |
215 | kfree(ib_conn->page_vec); | |
bcc60c38 | 216 | kfree(ib_conn->login_buf); |
1cfa0a75 OG |
217 | alloc_err: |
218 | iser_err("unable to alloc mem or create resource, err %d\n", ret); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | /** | |
223 | * releases the FMR pool, QP and CMA ID objects, returns 0 on success, | |
224 | * -1 on failure | |
225 | */ | |
226 | static int iser_free_ib_conn_res(struct iser_conn *ib_conn) | |
227 | { | |
228 | BUG_ON(ib_conn == NULL); | |
229 | ||
230 | iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", | |
231 | ib_conn, ib_conn->cma_id, | |
232 | ib_conn->fmr_pool, ib_conn->qp); | |
233 | ||
234 | /* qp is created only once both addr & route are resolved */ | |
235 | if (ib_conn->fmr_pool != NULL) | |
236 | ib_destroy_fmr_pool(ib_conn->fmr_pool); | |
237 | ||
238 | if (ib_conn->qp != NULL) | |
239 | rdma_destroy_qp(ib_conn->cma_id); | |
240 | ||
241 | if (ib_conn->cma_id != NULL) | |
242 | rdma_destroy_id(ib_conn->cma_id); | |
243 | ||
244 | ib_conn->fmr_pool = NULL; | |
245 | ib_conn->qp = NULL; | |
246 | ib_conn->cma_id = NULL; | |
247 | kfree(ib_conn->page_vec); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | /** | |
253 | * based on the resolved device node GUID see if there already allocated | |
254 | * device for this device. If there's no such, create one. | |
255 | */ | |
256 | static | |
257 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
258 | { | |
9a378270 | 259 | struct iser_device *device; |
1cfa0a75 OG |
260 | |
261 | mutex_lock(&ig.device_list_mutex); | |
262 | ||
9a378270 | 263 | list_for_each_entry(device, &ig.device_list, ig_list) |
1cfa0a75 OG |
264 | /* find if there's a match using the node GUID */ |
265 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
d33ed425 | 266 | goto inc_refcnt; |
9a378270 AR |
267 | |
268 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
269 | if (device == NULL) | |
270 | goto out; | |
271 | ||
272 | /* assign this device to the device */ | |
273 | device->ib_device = cma_id->device; | |
274 | /* init the device and link it into ig device list */ | |
275 | if (iser_create_device_ib_res(device)) { | |
276 | kfree(device); | |
277 | device = NULL; | |
278 | goto out; | |
1cfa0a75 | 279 | } |
9a378270 AR |
280 | list_add(&device->ig_list, &ig.device_list); |
281 | ||
d33ed425 | 282 | inc_refcnt: |
1cfa0a75 | 283 | device->refcount++; |
d33ed425 | 284 | out: |
1cfa0a75 OG |
285 | mutex_unlock(&ig.device_list_mutex); |
286 | return device; | |
287 | } | |
288 | ||
289 | /* if there's no demand for this device, release it */ | |
290 | static void iser_device_try_release(struct iser_device *device) | |
291 | { | |
292 | mutex_lock(&ig.device_list_mutex); | |
293 | device->refcount--; | |
294 | iser_err("device %p refcount %d\n",device,device->refcount); | |
295 | if (!device->refcount) { | |
296 | iser_free_device_ib_res(device); | |
297 | list_del(&device->ig_list); | |
298 | kfree(device); | |
299 | } | |
300 | mutex_unlock(&ig.device_list_mutex); | |
301 | } | |
302 | ||
1cfa0a75 OG |
303 | static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, |
304 | enum iser_ib_conn_state comp, | |
305 | enum iser_ib_conn_state exch) | |
306 | { | |
307 | int ret; | |
308 | ||
309 | spin_lock_bh(&ib_conn->lock); | |
310 | if ((ret = (ib_conn->state == comp))) | |
311 | ib_conn->state = exch; | |
312 | spin_unlock_bh(&ib_conn->lock); | |
313 | return ret; | |
314 | } | |
315 | ||
41179e2d RD |
316 | /** |
317 | * Frees all conn objects and deallocs conn descriptor | |
318 | */ | |
319 | static void iser_conn_release(struct iser_conn *ib_conn) | |
320 | { | |
321 | struct iser_device *device = ib_conn->device; | |
322 | ||
323 | BUG_ON(ib_conn->state != ISER_CONN_DOWN); | |
324 | ||
325 | mutex_lock(&ig.connlist_mutex); | |
326 | list_del(&ib_conn->conn_list); | |
327 | mutex_unlock(&ig.connlist_mutex); | |
bcc60c38 | 328 | iser_free_rx_descriptors(ib_conn); |
41179e2d RD |
329 | iser_free_ib_conn_res(ib_conn); |
330 | ib_conn->device = NULL; | |
331 | /* on EVENT_ADDR_ERROR there's no device yet for this conn */ | |
332 | if (device != NULL) | |
333 | iser_device_try_release(device); | |
334 | if (ib_conn->iser_conn) | |
335 | ib_conn->iser_conn->ib_conn = NULL; | |
412eeafa | 336 | iscsi_destroy_endpoint(ib_conn->ep); |
41179e2d RD |
337 | } |
338 | ||
b40977d9 MC |
339 | void iser_conn_get(struct iser_conn *ib_conn) |
340 | { | |
341 | atomic_inc(&ib_conn->refcount); | |
342 | } | |
343 | ||
344 | void iser_conn_put(struct iser_conn *ib_conn) | |
345 | { | |
346 | if (atomic_dec_and_test(&ib_conn->refcount)) | |
347 | iser_conn_release(ib_conn); | |
41179e2d RD |
348 | } |
349 | ||
1cfa0a75 OG |
350 | /** |
351 | * triggers start of the disconnect procedures and wait for them to be done | |
352 | */ | |
353 | void iser_conn_terminate(struct iser_conn *ib_conn) | |
354 | { | |
355 | int err = 0; | |
356 | ||
357 | /* change the ib conn state only if the conn is UP, however always call | |
358 | * rdma_disconnect since this is the only way to cause the CMA to change | |
359 | * the QP state to ERROR | |
360 | */ | |
361 | ||
362 | iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); | |
363 | err = rdma_disconnect(ib_conn->cma_id); | |
364 | if (err) | |
365 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
366 | ib_conn,err); | |
367 | ||
368 | wait_event_interruptible(ib_conn->wait, | |
369 | ib_conn->state == ISER_CONN_DOWN); | |
370 | ||
b40977d9 | 371 | iser_conn_put(ib_conn); |
1cfa0a75 OG |
372 | } |
373 | ||
374 | static void iser_connect_error(struct rdma_cm_id *cma_id) | |
375 | { | |
376 | struct iser_conn *ib_conn; | |
377 | ib_conn = (struct iser_conn *)cma_id->context; | |
378 | ||
379 | ib_conn->state = ISER_CONN_DOWN; | |
380 | wake_up_interruptible(&ib_conn->wait); | |
381 | } | |
382 | ||
383 | static void iser_addr_handler(struct rdma_cm_id *cma_id) | |
384 | { | |
385 | struct iser_device *device; | |
386 | struct iser_conn *ib_conn; | |
387 | int ret; | |
388 | ||
389 | device = iser_device_find_by_ib_device(cma_id); | |
d33ed425 AR |
390 | if (!device) { |
391 | iser_err("device lookup/creation failed\n"); | |
392 | iser_connect_error(cma_id); | |
393 | return; | |
394 | } | |
395 | ||
1cfa0a75 OG |
396 | ib_conn = (struct iser_conn *)cma_id->context; |
397 | ib_conn->device = device; | |
398 | ||
399 | ret = rdma_resolve_route(cma_id, 1000); | |
400 | if (ret) { | |
401 | iser_err("resolve route failed: %d\n", ret); | |
402 | iser_connect_error(cma_id); | |
403 | } | |
1cfa0a75 OG |
404 | } |
405 | ||
406 | static void iser_route_handler(struct rdma_cm_id *cma_id) | |
407 | { | |
408 | struct rdma_conn_param conn_param; | |
409 | int ret; | |
410 | ||
411 | ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); | |
412 | if (ret) | |
413 | goto failure; | |
414 | ||
1cfa0a75 OG |
415 | memset(&conn_param, 0, sizeof conn_param); |
416 | conn_param.responder_resources = 4; | |
417 | conn_param.initiator_depth = 1; | |
418 | conn_param.retry_count = 7; | |
419 | conn_param.rnr_retry_count = 6; | |
420 | ||
421 | ret = rdma_connect(cma_id, &conn_param); | |
422 | if (ret) { | |
423 | iser_err("failure connecting: %d\n", ret); | |
424 | goto failure; | |
425 | } | |
426 | ||
427 | return; | |
428 | failure: | |
429 | iser_connect_error(cma_id); | |
430 | } | |
431 | ||
432 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
433 | { | |
434 | struct iser_conn *ib_conn; | |
435 | ||
436 | ib_conn = (struct iser_conn *)cma_id->context; | |
437 | ib_conn->state = ISER_CONN_UP; | |
438 | wake_up_interruptible(&ib_conn->wait); | |
439 | } | |
440 | ||
441 | static void iser_disconnected_handler(struct rdma_cm_id *cma_id) | |
442 | { | |
443 | struct iser_conn *ib_conn; | |
444 | ||
445 | ib_conn = (struct iser_conn *)cma_id->context; | |
446 | ib_conn->disc_evt_flag = 1; | |
447 | ||
448 | /* getting here when the state is UP means that the conn is being * | |
449 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
450 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
451 | ISER_CONN_TERMINATING)) | |
452 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
453 | ISCSI_ERR_CONN_FAILED); | |
454 | ||
455 | /* Complete the termination process if no posts are pending */ | |
704315f0 | 456 | if (ib_conn->post_recv_buf_count == 0 && |
1cfa0a75 OG |
457 | (atomic_read(&ib_conn->post_send_buf_count) == 0)) { |
458 | ib_conn->state = ISER_CONN_DOWN; | |
459 | wake_up_interruptible(&ib_conn->wait); | |
460 | } | |
461 | } | |
462 | ||
463 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
464 | { | |
465 | int ret = 0; | |
466 | ||
467 | iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); | |
468 | ||
469 | switch (event->event) { | |
470 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
471 | iser_addr_handler(cma_id); | |
472 | break; | |
473 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
474 | iser_route_handler(cma_id); | |
475 | break; | |
476 | case RDMA_CM_EVENT_ESTABLISHED: | |
477 | iser_connected_handler(cma_id); | |
478 | break; | |
479 | case RDMA_CM_EVENT_ADDR_ERROR: | |
480 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
481 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
482 | case RDMA_CM_EVENT_UNREACHABLE: | |
483 | case RDMA_CM_EVENT_REJECTED: | |
484 | iser_err("event: %d, error: %d\n", event->event, event->status); | |
485 | iser_connect_error(cma_id); | |
486 | break; | |
487 | case RDMA_CM_EVENT_DISCONNECTED: | |
1cfa0a75 | 488 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
2f5de151 | 489 | case RDMA_CM_EVENT_ADDR_CHANGE: |
d97c5170 | 490 | iser_disconnected_handler(cma_id); |
1cfa0a75 | 491 | break; |
1cfa0a75 | 492 | default: |
a4ef1451 | 493 | iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
1cfa0a75 OG |
494 | break; |
495 | } | |
496 | return ret; | |
497 | } | |
498 | ||
412eeafa | 499 | void iser_conn_init(struct iser_conn *ib_conn) |
1cfa0a75 | 500 | { |
1cfa0a75 OG |
501 | ib_conn->state = ISER_CONN_INIT; |
502 | init_waitqueue_head(&ib_conn->wait); | |
704315f0 | 503 | ib_conn->post_recv_buf_count = 0; |
1cfa0a75 | 504 | atomic_set(&ib_conn->post_send_buf_count, 0); |
b40977d9 | 505 | atomic_set(&ib_conn->refcount, 1); |
1cfa0a75 OG |
506 | INIT_LIST_HEAD(&ib_conn->conn_list); |
507 | spin_lock_init(&ib_conn->lock); | |
1cfa0a75 OG |
508 | } |
509 | ||
510 | /** | |
511 | * starts the process of connecting to the target | |
94e2bd68 | 512 | * sleeps until the connection is established or rejected |
1cfa0a75 OG |
513 | */ |
514 | int iser_connect(struct iser_conn *ib_conn, | |
515 | struct sockaddr_in *src_addr, | |
516 | struct sockaddr_in *dst_addr, | |
517 | int non_blocking) | |
518 | { | |
519 | struct sockaddr *src, *dst; | |
520 | int err = 0; | |
521 | ||
63779436 HH |
522 | sprintf(ib_conn->name, "%pI4:%d", |
523 | &dst_addr->sin_addr.s_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
524 | |
525 | /* the device is known only --after-- address resolution */ | |
526 | ib_conn->device = NULL; | |
527 | ||
63779436 HH |
528 | iser_err("connecting to: %pI4, port 0x%x\n", |
529 | &dst_addr->sin_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
530 | |
531 | ib_conn->state = ISER_CONN_PENDING; | |
532 | ||
533 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, | |
534 | (void *)ib_conn, | |
535 | RDMA_PS_TCP); | |
536 | if (IS_ERR(ib_conn->cma_id)) { | |
537 | err = PTR_ERR(ib_conn->cma_id); | |
538 | iser_err("rdma_create_id failed: %d\n", err); | |
539 | goto id_failure; | |
540 | } | |
541 | ||
542 | src = (struct sockaddr *)src_addr; | |
543 | dst = (struct sockaddr *)dst_addr; | |
544 | err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); | |
545 | if (err) { | |
546 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
547 | goto addr_failure; | |
548 | } | |
549 | ||
550 | if (!non_blocking) { | |
551 | wait_event_interruptible(ib_conn->wait, | |
552 | (ib_conn->state != ISER_CONN_PENDING)); | |
553 | ||
554 | if (ib_conn->state != ISER_CONN_UP) { | |
555 | err = -EIO; | |
556 | goto connect_failure; | |
557 | } | |
558 | } | |
559 | ||
560 | mutex_lock(&ig.connlist_mutex); | |
561 | list_add(&ib_conn->conn_list, &ig.connlist); | |
562 | mutex_unlock(&ig.connlist_mutex); | |
563 | return 0; | |
564 | ||
565 | id_failure: | |
566 | ib_conn->cma_id = NULL; | |
567 | addr_failure: | |
568 | ib_conn->state = ISER_CONN_DOWN; | |
569 | connect_failure: | |
570 | iser_conn_release(ib_conn); | |
571 | return err; | |
572 | } | |
573 | ||
1cfa0a75 OG |
574 | /** |
575 | * iser_reg_page_vec - Register physical memory | |
576 | * | |
577 | * returns: 0 on success, errno code on failure | |
578 | */ | |
579 | int iser_reg_page_vec(struct iser_conn *ib_conn, | |
580 | struct iser_page_vec *page_vec, | |
581 | struct iser_mem_reg *mem_reg) | |
582 | { | |
583 | struct ib_pool_fmr *mem; | |
584 | u64 io_addr; | |
585 | u64 *page_list; | |
586 | int status; | |
587 | ||
588 | page_list = page_vec->pages; | |
589 | io_addr = page_list[0]; | |
590 | ||
591 | mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, | |
592 | page_list, | |
593 | page_vec->length, | |
adfaa888 | 594 | io_addr); |
1cfa0a75 OG |
595 | |
596 | if (IS_ERR(mem)) { | |
597 | status = (int)PTR_ERR(mem); | |
598 | iser_err("ib_fmr_pool_map_phys failed: %d\n", status); | |
599 | return status; | |
600 | } | |
601 | ||
602 | mem_reg->lkey = mem->fmr->lkey; | |
603 | mem_reg->rkey = mem->fmr->rkey; | |
8dfa0876 | 604 | mem_reg->len = page_vec->length * SIZE_4K; |
1cfa0a75 | 605 | mem_reg->va = io_addr; |
d8111028 | 606 | mem_reg->is_fmr = 1; |
1cfa0a75 OG |
607 | mem_reg->mem_h = (void *)mem; |
608 | ||
609 | mem_reg->va += page_vec->offset; | |
610 | mem_reg->len = page_vec->data_size; | |
611 | ||
612 | iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " | |
613 | "entry[0]: (0x%08lx,%ld)] -> " | |
614 | "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", | |
615 | page_vec, page_vec->length, | |
616 | (unsigned long)page_vec->pages[0], | |
617 | (unsigned long)page_vec->data_size, | |
618 | (unsigned int)mem_reg->lkey, mem_reg->mem_h, | |
619 | (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /** | |
624 | * Unregister (previosuly registered) memory. | |
625 | */ | |
626 | void iser_unreg_mem(struct iser_mem_reg *reg) | |
627 | { | |
628 | int ret; | |
629 | ||
630 | iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); | |
631 | ||
632 | ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); | |
633 | if (ret) | |
634 | iser_err("ib_fmr_pool_unmap failed %d\n", ret); | |
635 | ||
636 | reg->mem_h = NULL; | |
637 | } | |
638 | ||
bcc60c38 OG |
639 | int iser_post_recvl(struct iser_conn *ib_conn) |
640 | { | |
641 | struct ib_recv_wr rx_wr, *rx_wr_failed; | |
642 | struct ib_sge sge; | |
643 | int ib_ret; | |
644 | ||
645 | sge.addr = ib_conn->login_dma; | |
646 | sge.length = ISER_RX_LOGIN_SIZE; | |
647 | sge.lkey = ib_conn->device->mr->lkey; | |
648 | ||
649 | rx_wr.wr_id = (unsigned long)ib_conn->login_buf; | |
650 | rx_wr.sg_list = &sge; | |
651 | rx_wr.num_sge = 1; | |
652 | rx_wr.next = NULL; | |
653 | ||
704315f0 | 654 | ib_conn->post_recv_buf_count++; |
bcc60c38 OG |
655 | ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); |
656 | if (ib_ret) { | |
657 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 658 | ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
659 | } |
660 | return ib_ret; | |
661 | } | |
662 | ||
663 | int iser_post_recvm(struct iser_conn *ib_conn, int count) | |
664 | { | |
665 | struct ib_recv_wr *rx_wr, *rx_wr_failed; | |
666 | int i, ib_ret; | |
667 | unsigned int my_rx_head = ib_conn->rx_desc_head; | |
668 | struct iser_rx_desc *rx_desc; | |
669 | ||
670 | for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { | |
671 | rx_desc = &ib_conn->rx_descs[my_rx_head]; | |
672 | rx_wr->wr_id = (unsigned long)rx_desc; | |
673 | rx_wr->sg_list = &rx_desc->rx_sg; | |
674 | rx_wr->num_sge = 1; | |
675 | rx_wr->next = rx_wr + 1; | |
676 | my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); | |
677 | } | |
678 | ||
679 | rx_wr--; | |
680 | rx_wr->next = NULL; /* mark end of work requests list */ | |
681 | ||
704315f0 | 682 | ib_conn->post_recv_buf_count += count; |
bcc60c38 OG |
683 | ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); |
684 | if (ib_ret) { | |
685 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 686 | ib_conn->post_recv_buf_count -= count; |
bcc60c38 OG |
687 | } else |
688 | ib_conn->rx_desc_head = my_rx_head; | |
689 | return ib_ret; | |
690 | } | |
691 | ||
692 | ||
1cfa0a75 OG |
693 | /** |
694 | * iser_start_send - Initiate a Send DTO operation | |
695 | * | |
696 | * returns 0 on success, -1 on failure | |
697 | */ | |
f19624aa | 698 | int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) |
1cfa0a75 | 699 | { |
f19624aa | 700 | int ib_ret; |
1cfa0a75 | 701 | struct ib_send_wr send_wr, *send_wr_failed; |
1cfa0a75 | 702 | |
f19624aa OG |
703 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
704 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
1cfa0a75 OG |
705 | |
706 | send_wr.next = NULL; | |
707 | send_wr.wr_id = (unsigned long)tx_desc; | |
f19624aa OG |
708 | send_wr.sg_list = tx_desc->tx_sg; |
709 | send_wr.num_sge = tx_desc->num_sge; | |
1cfa0a75 | 710 | send_wr.opcode = IB_WR_SEND; |
f19624aa | 711 | send_wr.send_flags = IB_SEND_SIGNALED; |
1cfa0a75 OG |
712 | |
713 | atomic_inc(&ib_conn->post_send_buf_count); | |
714 | ||
715 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); | |
716 | if (ib_ret) { | |
1cfa0a75 OG |
717 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
718 | atomic_dec(&ib_conn->post_send_buf_count); | |
1cfa0a75 | 719 | } |
f19624aa | 720 | return ib_ret; |
1cfa0a75 OG |
721 | } |
722 | ||
f19624aa | 723 | static void iser_handle_comp_error(struct iser_tx_desc *desc, |
bcc60c38 | 724 | struct iser_conn *ib_conn) |
1cfa0a75 | 725 | { |
78ad0a34 OG |
726 | if (desc && desc->type == ISCSI_TX_DATAOUT) |
727 | kmem_cache_free(ig.desc_cache, desc); | |
1cfa0a75 | 728 | |
704315f0 | 729 | if (ib_conn->post_recv_buf_count == 0 && |
1d426d64 EZ |
730 | atomic_read(&ib_conn->post_send_buf_count) == 0) { |
731 | /* getting here when the state is UP means that the conn is * | |
732 | * being terminated asynchronously from the iSCSI layer's * | |
733 | * perspective. */ | |
734 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
735 | ISER_CONN_TERMINATING)) | |
736 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
737 | ISCSI_ERR_CONN_FAILED); | |
738 | ||
739 | /* complete the termination process if disconnect event was delivered * | |
740 | * note there are no more non completed posts to the QP */ | |
741 | if (ib_conn->disc_evt_flag) { | |
742 | ib_conn->state = ISER_CONN_DOWN; | |
743 | wake_up_interruptible(&ib_conn->wait); | |
744 | } | |
745 | } | |
1cfa0a75 OG |
746 | } |
747 | ||
78ad0a34 OG |
748 | static int iser_drain_tx_cq(struct iser_device *device) |
749 | { | |
750 | struct ib_cq *cq = device->tx_cq; | |
751 | struct ib_wc wc; | |
f19624aa | 752 | struct iser_tx_desc *tx_desc; |
78ad0a34 OG |
753 | struct iser_conn *ib_conn; |
754 | int completed_tx = 0; | |
755 | ||
756 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
f19624aa | 757 | tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; |
78ad0a34 OG |
758 | ib_conn = wc.qp->qp_context; |
759 | if (wc.status == IB_WC_SUCCESS) { | |
760 | if (wc.opcode == IB_WC_SEND) | |
f19624aa | 761 | iser_snd_completion(tx_desc, ib_conn); |
78ad0a34 OG |
762 | else |
763 | iser_err("expected opcode %d got %d\n", | |
764 | IB_WC_SEND, wc.opcode); | |
765 | } else { | |
766 | iser_err("tx id %llx status %d vend_err %x\n", | |
767 | wc.wr_id, wc.status, wc.vendor_err); | |
768 | atomic_dec(&ib_conn->post_send_buf_count); | |
769 | iser_handle_comp_error(tx_desc, ib_conn); | |
770 | } | |
771 | completed_tx++; | |
772 | } | |
773 | return completed_tx; | |
774 | } | |
775 | ||
776 | ||
1cfa0a75 OG |
777 | static void iser_cq_tasklet_fn(unsigned long data) |
778 | { | |
779 | struct iser_device *device = (struct iser_device *)data; | |
78ad0a34 | 780 | struct ib_cq *cq = device->rx_cq; |
1cfa0a75 | 781 | struct ib_wc wc; |
78ad0a34 | 782 | struct iser_rx_desc *desc; |
1cfa0a75 | 783 | unsigned long xfer_len; |
bcc60c38 | 784 | struct iser_conn *ib_conn; |
78ad0a34 OG |
785 | int completed_tx, completed_rx; |
786 | completed_tx = completed_rx = 0; | |
1cfa0a75 OG |
787 | |
788 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
78ad0a34 | 789 | desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; |
1cfa0a75 | 790 | BUG_ON(desc == NULL); |
bcc60c38 | 791 | ib_conn = wc.qp->qp_context; |
1cfa0a75 | 792 | if (wc.status == IB_WC_SUCCESS) { |
bcc60c38 | 793 | if (wc.opcode == IB_WC_RECV) { |
1cfa0a75 | 794 | xfer_len = (unsigned long)wc.byte_len; |
78ad0a34 OG |
795 | iser_rcv_completion(desc, xfer_len, ib_conn); |
796 | } else | |
797 | iser_err("expected opcode %d got %d\n", | |
798 | IB_WC_RECV, wc.opcode); | |
1cfa0a75 | 799 | } else { |
bcc60c38 | 800 | if (wc.status != IB_WC_WR_FLUSH_ERR) |
78ad0a34 | 801 | iser_err("rx id %llx status %d vend_err %x\n", |
bcc60c38 | 802 | wc.wr_id, wc.status, wc.vendor_err); |
78ad0a34 OG |
803 | ib_conn->post_recv_buf_count--; |
804 | iser_handle_comp_error(NULL, ib_conn); | |
1cfa0a75 | 805 | } |
78ad0a34 OG |
806 | completed_rx++; |
807 | if (!(completed_rx & 63)) | |
808 | completed_tx += iser_drain_tx_cq(device); | |
1cfa0a75 OG |
809 | } |
810 | /* #warning "it is assumed here that arming CQ only once its empty" * | |
811 | * " would not cause interrupts to be missed" */ | |
812 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
78ad0a34 OG |
813 | |
814 | completed_tx += iser_drain_tx_cq(device); | |
815 | iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); | |
1cfa0a75 OG |
816 | } |
817 | ||
818 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
819 | { | |
820 | struct iser_device *device = (struct iser_device *)cq_context; | |
821 | ||
822 | tasklet_schedule(&device->cq_tasklet); | |
823 | } |