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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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
1cfa0a75 | 36 | #include <linux/delay.h> |
1cfa0a75 OG |
37 | |
38 | #include "iscsi_iser.h" | |
39 | ||
40 | #define ISCSI_ISER_MAX_CONN 8 | |
78ad0a34 OG |
41 | #define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
42 | #define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) | |
1cfa0a75 OG |
43 | |
44 | static void iser_cq_tasklet_fn(unsigned long data); | |
45 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context); | |
1cfa0a75 OG |
46 | |
47 | static void iser_cq_event_callback(struct ib_event *cause, void *context) | |
48 | { | |
49 | iser_err("got cq event %d \n", cause->event); | |
50 | } | |
51 | ||
52 | static void iser_qp_event_callback(struct ib_event *cause, void *context) | |
53 | { | |
54 | iser_err("got qp event %d\n",cause->event); | |
55 | } | |
56 | ||
2110f9bf OG |
57 | static void iser_event_handler(struct ib_event_handler *handler, |
58 | struct ib_event *event) | |
59 | { | |
60 | iser_err("async event %d on device %s port %d\n", event->event, | |
61 | event->device->name, event->element.port_num); | |
62 | } | |
63 | ||
1cfa0a75 OG |
64 | /** |
65 | * iser_create_device_ib_res - creates Protection Domain (PD), Completion | |
66 | * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with | |
67 | * the adapator. | |
68 | * | |
69 | * returns 0 on success, -1 on failure | |
70 | */ | |
71 | static int iser_create_device_ib_res(struct iser_device *device) | |
72 | { | |
73 | device->pd = ib_alloc_pd(device->ib_device); | |
74 | if (IS_ERR(device->pd)) | |
75 | goto pd_err; | |
76 | ||
78ad0a34 | 77 | device->rx_cq = ib_create_cq(device->ib_device, |
1cfa0a75 OG |
78 | iser_cq_callback, |
79 | iser_cq_event_callback, | |
80 | (void *)device, | |
78ad0a34 OG |
81 | ISER_MAX_RX_CQ_LEN, 0); |
82 | if (IS_ERR(device->rx_cq)) | |
83 | goto rx_cq_err; | |
1cfa0a75 | 84 | |
78ad0a34 OG |
85 | device->tx_cq = ib_create_cq(device->ib_device, |
86 | NULL, iser_cq_event_callback, | |
87 | (void *)device, | |
88 | ISER_MAX_TX_CQ_LEN, 0); | |
89 | ||
90 | if (IS_ERR(device->tx_cq)) | |
91 | goto tx_cq_err; | |
92 | ||
93 | if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) | |
1cfa0a75 OG |
94 | goto cq_arm_err; |
95 | ||
96 | tasklet_init(&device->cq_tasklet, | |
97 | iser_cq_tasklet_fn, | |
98 | (unsigned long)device); | |
99 | ||
d8111028 EZ |
100 | device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
101 | IB_ACCESS_REMOTE_WRITE | | |
102 | IB_ACCESS_REMOTE_READ); | |
1cfa0a75 OG |
103 | if (IS_ERR(device->mr)) |
104 | goto dma_mr_err; | |
105 | ||
2110f9bf OG |
106 | INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, |
107 | iser_event_handler); | |
108 | if (ib_register_event_handler(&device->event_handler)) | |
109 | goto handler_err; | |
110 | ||
1cfa0a75 OG |
111 | return 0; |
112 | ||
2110f9bf OG |
113 | handler_err: |
114 | ib_dereg_mr(device->mr); | |
1cfa0a75 OG |
115 | dma_mr_err: |
116 | tasklet_kill(&device->cq_tasklet); | |
117 | cq_arm_err: | |
78ad0a34 OG |
118 | ib_destroy_cq(device->tx_cq); |
119 | tx_cq_err: | |
120 | ib_destroy_cq(device->rx_cq); | |
121 | rx_cq_err: | |
1cfa0a75 OG |
122 | ib_dealloc_pd(device->pd); |
123 | pd_err: | |
124 | iser_err("failed to allocate an IB resource\n"); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | /** | |
38dc732f | 129 | * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
1cfa0a75 OG |
130 | * CQ and PD created with the device associated with the adapator. |
131 | */ | |
132 | static void iser_free_device_ib_res(struct iser_device *device) | |
133 | { | |
134 | BUG_ON(device->mr == NULL); | |
135 | ||
136 | tasklet_kill(&device->cq_tasklet); | |
2110f9bf | 137 | (void)ib_unregister_event_handler(&device->event_handler); |
1cfa0a75 | 138 | (void)ib_dereg_mr(device->mr); |
78ad0a34 OG |
139 | (void)ib_destroy_cq(device->tx_cq); |
140 | (void)ib_destroy_cq(device->rx_cq); | |
1cfa0a75 OG |
141 | (void)ib_dealloc_pd(device->pd); |
142 | ||
143 | device->mr = NULL; | |
78ad0a34 OG |
144 | device->tx_cq = NULL; |
145 | device->rx_cq = NULL; | |
1cfa0a75 OG |
146 | device->pd = NULL; |
147 | } | |
148 | ||
149 | /** | |
150 | * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) | |
151 | * | |
152 | * returns 0 on success, -1 on failure | |
153 | */ | |
154 | static int iser_create_ib_conn_res(struct iser_conn *ib_conn) | |
155 | { | |
156 | struct iser_device *device; | |
157 | struct ib_qp_init_attr init_attr; | |
bcc60c38 | 158 | int ret = -ENOMEM; |
1cfa0a75 OG |
159 | struct ib_fmr_pool_param params; |
160 | ||
161 | BUG_ON(ib_conn->device == NULL); | |
162 | ||
163 | device = ib_conn->device; | |
164 | ||
bcc60c38 | 165 | ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
9fda1ac5 DC |
166 | if (!ib_conn->login_buf) |
167 | goto out_err; | |
bcc60c38 OG |
168 | |
169 | ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, | |
170 | (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, | |
171 | DMA_FROM_DEVICE); | |
172 | ||
1cfa0a75 OG |
173 | ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + |
174 | (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), | |
175 | GFP_KERNEL); | |
9fda1ac5 DC |
176 | if (!ib_conn->page_vec) |
177 | goto out_err; | |
178 | ||
1cfa0a75 OG |
179 | ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); |
180 | ||
8dfa0876 | 181 | params.page_shift = SHIFT_4K; |
1cfa0a75 OG |
182 | /* when the first/last SG element are not start/end * |
183 | * page aligned, the map whould be of N+1 pages */ | |
184 | params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; | |
185 | /* make the pool size twice the max number of SCSI commands * | |
186 | * the ML is expected to queue, watermark for unmap at 50% */ | |
1548271e MC |
187 | params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; |
188 | params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; | |
1cfa0a75 OG |
189 | params.cache = 0; |
190 | params.flush_function = NULL; | |
191 | params.access = (IB_ACCESS_LOCAL_WRITE | | |
192 | IB_ACCESS_REMOTE_WRITE | | |
193 | IB_ACCESS_REMOTE_READ); | |
194 | ||
195 | ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); | |
196 | if (IS_ERR(ib_conn->fmr_pool)) { | |
197 | ret = PTR_ERR(ib_conn->fmr_pool); | |
9fda1ac5 DC |
198 | ib_conn->fmr_pool = NULL; |
199 | goto out_err; | |
1cfa0a75 OG |
200 | } |
201 | ||
202 | memset(&init_attr, 0, sizeof init_attr); | |
203 | ||
204 | init_attr.event_handler = iser_qp_event_callback; | |
205 | init_attr.qp_context = (void *)ib_conn; | |
78ad0a34 OG |
206 | init_attr.send_cq = device->tx_cq; |
207 | init_attr.recv_cq = device->rx_cq; | |
1cfa0a75 OG |
208 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; |
209 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; | |
f19624aa | 210 | init_attr.cap.max_send_sge = 2; |
bcc60c38 | 211 | init_attr.cap.max_recv_sge = 1; |
1cfa0a75 OG |
212 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
213 | init_attr.qp_type = IB_QPT_RC; | |
214 | ||
215 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); | |
216 | if (ret) | |
9fda1ac5 | 217 | goto out_err; |
1cfa0a75 OG |
218 | |
219 | ib_conn->qp = ib_conn->cma_id->qp; | |
220 | iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", | |
221 | ib_conn, ib_conn->cma_id, | |
222 | ib_conn->fmr_pool, ib_conn->cma_id->qp); | |
223 | return ret; | |
224 | ||
9fda1ac5 | 225 | out_err: |
1cfa0a75 OG |
226 | iser_err("unable to alloc mem or create resource, err %d\n", ret); |
227 | return ret; | |
228 | } | |
229 | ||
230 | /** | |
231 | * releases the FMR pool, QP and CMA ID objects, returns 0 on success, | |
232 | * -1 on failure | |
233 | */ | |
39ff05db | 234 | static int iser_free_ib_conn_res(struct iser_conn *ib_conn, int can_destroy_id) |
1cfa0a75 OG |
235 | { |
236 | BUG_ON(ib_conn == NULL); | |
237 | ||
238 | iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", | |
239 | ib_conn, ib_conn->cma_id, | |
240 | ib_conn->fmr_pool, ib_conn->qp); | |
241 | ||
242 | /* qp is created only once both addr & route are resolved */ | |
243 | if (ib_conn->fmr_pool != NULL) | |
244 | ib_destroy_fmr_pool(ib_conn->fmr_pool); | |
245 | ||
246 | if (ib_conn->qp != NULL) | |
247 | rdma_destroy_qp(ib_conn->cma_id); | |
248 | ||
39ff05db OG |
249 | /* if cma handler context, the caller acts s.t the cma destroy the id */ |
250 | if (ib_conn->cma_id != NULL && can_destroy_id) | |
1cfa0a75 OG |
251 | rdma_destroy_id(ib_conn->cma_id); |
252 | ||
253 | ib_conn->fmr_pool = NULL; | |
254 | ib_conn->qp = NULL; | |
255 | ib_conn->cma_id = NULL; | |
256 | kfree(ib_conn->page_vec); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /** | |
262 | * based on the resolved device node GUID see if there already allocated | |
263 | * device for this device. If there's no such, create one. | |
264 | */ | |
265 | static | |
266 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
267 | { | |
9a378270 | 268 | struct iser_device *device; |
1cfa0a75 OG |
269 | |
270 | mutex_lock(&ig.device_list_mutex); | |
271 | ||
9a378270 | 272 | list_for_each_entry(device, &ig.device_list, ig_list) |
1cfa0a75 OG |
273 | /* find if there's a match using the node GUID */ |
274 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
d33ed425 | 275 | goto inc_refcnt; |
9a378270 AR |
276 | |
277 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
278 | if (device == NULL) | |
279 | goto out; | |
280 | ||
281 | /* assign this device to the device */ | |
282 | device->ib_device = cma_id->device; | |
283 | /* init the device and link it into ig device list */ | |
284 | if (iser_create_device_ib_res(device)) { | |
285 | kfree(device); | |
286 | device = NULL; | |
287 | goto out; | |
1cfa0a75 | 288 | } |
9a378270 AR |
289 | list_add(&device->ig_list, &ig.device_list); |
290 | ||
d33ed425 | 291 | inc_refcnt: |
1cfa0a75 | 292 | device->refcount++; |
d33ed425 | 293 | out: |
1cfa0a75 OG |
294 | mutex_unlock(&ig.device_list_mutex); |
295 | return device; | |
296 | } | |
297 | ||
298 | /* if there's no demand for this device, release it */ | |
299 | static void iser_device_try_release(struct iser_device *device) | |
300 | { | |
301 | mutex_lock(&ig.device_list_mutex); | |
302 | device->refcount--; | |
303 | iser_err("device %p refcount %d\n",device,device->refcount); | |
304 | if (!device->refcount) { | |
305 | iser_free_device_ib_res(device); | |
306 | list_del(&device->ig_list); | |
307 | kfree(device); | |
308 | } | |
309 | mutex_unlock(&ig.device_list_mutex); | |
310 | } | |
311 | ||
1cfa0a75 OG |
312 | static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, |
313 | enum iser_ib_conn_state comp, | |
314 | enum iser_ib_conn_state exch) | |
315 | { | |
316 | int ret; | |
317 | ||
318 | spin_lock_bh(&ib_conn->lock); | |
319 | if ((ret = (ib_conn->state == comp))) | |
320 | ib_conn->state = exch; | |
321 | spin_unlock_bh(&ib_conn->lock); | |
322 | return ret; | |
323 | } | |
324 | ||
41179e2d RD |
325 | /** |
326 | * Frees all conn objects and deallocs conn descriptor | |
327 | */ | |
39ff05db | 328 | static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id) |
41179e2d RD |
329 | { |
330 | struct iser_device *device = ib_conn->device; | |
331 | ||
332 | BUG_ON(ib_conn->state != ISER_CONN_DOWN); | |
333 | ||
334 | mutex_lock(&ig.connlist_mutex); | |
335 | list_del(&ib_conn->conn_list); | |
336 | mutex_unlock(&ig.connlist_mutex); | |
bcc60c38 | 337 | iser_free_rx_descriptors(ib_conn); |
39ff05db | 338 | iser_free_ib_conn_res(ib_conn, can_destroy_id); |
41179e2d RD |
339 | ib_conn->device = NULL; |
340 | /* on EVENT_ADDR_ERROR there's no device yet for this conn */ | |
341 | if (device != NULL) | |
342 | iser_device_try_release(device); | |
412eeafa | 343 | iscsi_destroy_endpoint(ib_conn->ep); |
41179e2d RD |
344 | } |
345 | ||
b40977d9 MC |
346 | void iser_conn_get(struct iser_conn *ib_conn) |
347 | { | |
348 | atomic_inc(&ib_conn->refcount); | |
349 | } | |
350 | ||
39ff05db | 351 | int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id) |
b40977d9 | 352 | { |
39ff05db OG |
353 | if (atomic_dec_and_test(&ib_conn->refcount)) { |
354 | iser_conn_release(ib_conn, can_destroy_id); | |
355 | return 1; | |
356 | } | |
357 | return 0; | |
41179e2d RD |
358 | } |
359 | ||
1cfa0a75 OG |
360 | /** |
361 | * triggers start of the disconnect procedures and wait for them to be done | |
362 | */ | |
363 | void iser_conn_terminate(struct iser_conn *ib_conn) | |
364 | { | |
365 | int err = 0; | |
366 | ||
367 | /* change the ib conn state only if the conn is UP, however always call | |
368 | * rdma_disconnect since this is the only way to cause the CMA to change | |
369 | * the QP state to ERROR | |
370 | */ | |
371 | ||
372 | iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); | |
373 | err = rdma_disconnect(ib_conn->cma_id); | |
374 | if (err) | |
375 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
376 | ib_conn,err); | |
377 | ||
378 | wait_event_interruptible(ib_conn->wait, | |
379 | ib_conn->state == ISER_CONN_DOWN); | |
380 | ||
39ff05db | 381 | iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ |
1cfa0a75 OG |
382 | } |
383 | ||
39ff05db | 384 | static int iser_connect_error(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
385 | { |
386 | struct iser_conn *ib_conn; | |
387 | ib_conn = (struct iser_conn *)cma_id->context; | |
388 | ||
389 | ib_conn->state = ISER_CONN_DOWN; | |
390 | wake_up_interruptible(&ib_conn->wait); | |
39ff05db | 391 | return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ |
1cfa0a75 OG |
392 | } |
393 | ||
39ff05db | 394 | static int iser_addr_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
395 | { |
396 | struct iser_device *device; | |
397 | struct iser_conn *ib_conn; | |
398 | int ret; | |
399 | ||
400 | device = iser_device_find_by_ib_device(cma_id); | |
d33ed425 AR |
401 | if (!device) { |
402 | iser_err("device lookup/creation failed\n"); | |
39ff05db | 403 | return iser_connect_error(cma_id); |
d33ed425 AR |
404 | } |
405 | ||
1cfa0a75 OG |
406 | ib_conn = (struct iser_conn *)cma_id->context; |
407 | ib_conn->device = device; | |
408 | ||
409 | ret = rdma_resolve_route(cma_id, 1000); | |
410 | if (ret) { | |
411 | iser_err("resolve route failed: %d\n", ret); | |
39ff05db | 412 | return iser_connect_error(cma_id); |
1cfa0a75 | 413 | } |
39ff05db OG |
414 | |
415 | return 0; | |
1cfa0a75 OG |
416 | } |
417 | ||
39ff05db | 418 | static int iser_route_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
419 | { |
420 | struct rdma_conn_param conn_param; | |
421 | int ret; | |
422 | ||
423 | ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); | |
424 | if (ret) | |
425 | goto failure; | |
426 | ||
1cfa0a75 OG |
427 | memset(&conn_param, 0, sizeof conn_param); |
428 | conn_param.responder_resources = 4; | |
429 | conn_param.initiator_depth = 1; | |
430 | conn_param.retry_count = 7; | |
431 | conn_param.rnr_retry_count = 6; | |
432 | ||
433 | ret = rdma_connect(cma_id, &conn_param); | |
434 | if (ret) { | |
435 | iser_err("failure connecting: %d\n", ret); | |
436 | goto failure; | |
437 | } | |
438 | ||
39ff05db | 439 | return 0; |
1cfa0a75 | 440 | failure: |
39ff05db | 441 | return iser_connect_error(cma_id); |
1cfa0a75 OG |
442 | } |
443 | ||
444 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
445 | { | |
446 | struct iser_conn *ib_conn; | |
447 | ||
448 | ib_conn = (struct iser_conn *)cma_id->context; | |
449 | ib_conn->state = ISER_CONN_UP; | |
450 | wake_up_interruptible(&ib_conn->wait); | |
451 | } | |
452 | ||
39ff05db | 453 | static int iser_disconnected_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
454 | { |
455 | struct iser_conn *ib_conn; | |
39ff05db | 456 | int ret; |
1cfa0a75 OG |
457 | |
458 | ib_conn = (struct iser_conn *)cma_id->context; | |
1cfa0a75 OG |
459 | |
460 | /* getting here when the state is UP means that the conn is being * | |
461 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
462 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
463 | ISER_CONN_TERMINATING)) | |
464 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
465 | ISCSI_ERR_CONN_FAILED); | |
466 | ||
467 | /* Complete the termination process if no posts are pending */ | |
704315f0 | 468 | if (ib_conn->post_recv_buf_count == 0 && |
1cfa0a75 OG |
469 | (atomic_read(&ib_conn->post_send_buf_count) == 0)) { |
470 | ib_conn->state = ISER_CONN_DOWN; | |
471 | wake_up_interruptible(&ib_conn->wait); | |
472 | } | |
39ff05db OG |
473 | |
474 | ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ | |
475 | return ret; | |
1cfa0a75 OG |
476 | } |
477 | ||
478 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
479 | { | |
480 | int ret = 0; | |
481 | ||
39ff05db OG |
482 | iser_err("event %d status %d conn %p id %p\n", |
483 | event->event, event->status, cma_id->context, cma_id); | |
1cfa0a75 OG |
484 | |
485 | switch (event->event) { | |
486 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
39ff05db | 487 | ret = iser_addr_handler(cma_id); |
1cfa0a75 OG |
488 | break; |
489 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
39ff05db | 490 | ret = iser_route_handler(cma_id); |
1cfa0a75 OG |
491 | break; |
492 | case RDMA_CM_EVENT_ESTABLISHED: | |
493 | iser_connected_handler(cma_id); | |
494 | break; | |
495 | case RDMA_CM_EVENT_ADDR_ERROR: | |
496 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
497 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
498 | case RDMA_CM_EVENT_UNREACHABLE: | |
499 | case RDMA_CM_EVENT_REJECTED: | |
39ff05db | 500 | ret = iser_connect_error(cma_id); |
1cfa0a75 OG |
501 | break; |
502 | case RDMA_CM_EVENT_DISCONNECTED: | |
1cfa0a75 | 503 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
2f5de151 | 504 | case RDMA_CM_EVENT_ADDR_CHANGE: |
39ff05db | 505 | ret = iser_disconnected_handler(cma_id); |
1cfa0a75 | 506 | break; |
1cfa0a75 | 507 | default: |
a4ef1451 | 508 | iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
1cfa0a75 OG |
509 | break; |
510 | } | |
511 | return ret; | |
512 | } | |
513 | ||
412eeafa | 514 | void iser_conn_init(struct iser_conn *ib_conn) |
1cfa0a75 | 515 | { |
1cfa0a75 OG |
516 | ib_conn->state = ISER_CONN_INIT; |
517 | init_waitqueue_head(&ib_conn->wait); | |
704315f0 | 518 | ib_conn->post_recv_buf_count = 0; |
1cfa0a75 | 519 | atomic_set(&ib_conn->post_send_buf_count, 0); |
39ff05db | 520 | atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */ |
1cfa0a75 OG |
521 | INIT_LIST_HEAD(&ib_conn->conn_list); |
522 | spin_lock_init(&ib_conn->lock); | |
1cfa0a75 OG |
523 | } |
524 | ||
525 | /** | |
526 | * starts the process of connecting to the target | |
94e2bd68 | 527 | * sleeps until the connection is established or rejected |
1cfa0a75 OG |
528 | */ |
529 | int iser_connect(struct iser_conn *ib_conn, | |
530 | struct sockaddr_in *src_addr, | |
531 | struct sockaddr_in *dst_addr, | |
532 | int non_blocking) | |
533 | { | |
534 | struct sockaddr *src, *dst; | |
535 | int err = 0; | |
536 | ||
63779436 HH |
537 | sprintf(ib_conn->name, "%pI4:%d", |
538 | &dst_addr->sin_addr.s_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
539 | |
540 | /* the device is known only --after-- address resolution */ | |
541 | ib_conn->device = NULL; | |
542 | ||
63779436 HH |
543 | iser_err("connecting to: %pI4, port 0x%x\n", |
544 | &dst_addr->sin_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
545 | |
546 | ib_conn->state = ISER_CONN_PENDING; | |
547 | ||
39ff05db | 548 | iser_conn_get(ib_conn); /* ref ib conn's cma id */ |
1cfa0a75 OG |
549 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, |
550 | (void *)ib_conn, | |
551 | RDMA_PS_TCP); | |
552 | if (IS_ERR(ib_conn->cma_id)) { | |
553 | err = PTR_ERR(ib_conn->cma_id); | |
554 | iser_err("rdma_create_id failed: %d\n", err); | |
555 | goto id_failure; | |
556 | } | |
557 | ||
558 | src = (struct sockaddr *)src_addr; | |
559 | dst = (struct sockaddr *)dst_addr; | |
560 | err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); | |
561 | if (err) { | |
562 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
563 | goto addr_failure; | |
564 | } | |
565 | ||
566 | if (!non_blocking) { | |
567 | wait_event_interruptible(ib_conn->wait, | |
568 | (ib_conn->state != ISER_CONN_PENDING)); | |
569 | ||
570 | if (ib_conn->state != ISER_CONN_UP) { | |
571 | err = -EIO; | |
572 | goto connect_failure; | |
573 | } | |
574 | } | |
575 | ||
576 | mutex_lock(&ig.connlist_mutex); | |
577 | list_add(&ib_conn->conn_list, &ig.connlist); | |
578 | mutex_unlock(&ig.connlist_mutex); | |
579 | return 0; | |
580 | ||
581 | id_failure: | |
582 | ib_conn->cma_id = NULL; | |
583 | addr_failure: | |
584 | ib_conn->state = ISER_CONN_DOWN; | |
585 | connect_failure: | |
39ff05db | 586 | iser_conn_release(ib_conn, 1); |
1cfa0a75 OG |
587 | return err; |
588 | } | |
589 | ||
1cfa0a75 OG |
590 | /** |
591 | * iser_reg_page_vec - Register physical memory | |
592 | * | |
593 | * returns: 0 on success, errno code on failure | |
594 | */ | |
595 | int iser_reg_page_vec(struct iser_conn *ib_conn, | |
596 | struct iser_page_vec *page_vec, | |
597 | struct iser_mem_reg *mem_reg) | |
598 | { | |
599 | struct ib_pool_fmr *mem; | |
600 | u64 io_addr; | |
601 | u64 *page_list; | |
602 | int status; | |
603 | ||
604 | page_list = page_vec->pages; | |
605 | io_addr = page_list[0]; | |
606 | ||
607 | mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, | |
608 | page_list, | |
609 | page_vec->length, | |
adfaa888 | 610 | io_addr); |
1cfa0a75 OG |
611 | |
612 | if (IS_ERR(mem)) { | |
613 | status = (int)PTR_ERR(mem); | |
614 | iser_err("ib_fmr_pool_map_phys failed: %d\n", status); | |
615 | return status; | |
616 | } | |
617 | ||
618 | mem_reg->lkey = mem->fmr->lkey; | |
619 | mem_reg->rkey = mem->fmr->rkey; | |
8dfa0876 | 620 | mem_reg->len = page_vec->length * SIZE_4K; |
1cfa0a75 | 621 | mem_reg->va = io_addr; |
d8111028 | 622 | mem_reg->is_fmr = 1; |
1cfa0a75 OG |
623 | mem_reg->mem_h = (void *)mem; |
624 | ||
625 | mem_reg->va += page_vec->offset; | |
626 | mem_reg->len = page_vec->data_size; | |
627 | ||
628 | iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " | |
629 | "entry[0]: (0x%08lx,%ld)] -> " | |
630 | "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", | |
631 | page_vec, page_vec->length, | |
632 | (unsigned long)page_vec->pages[0], | |
633 | (unsigned long)page_vec->data_size, | |
634 | (unsigned int)mem_reg->lkey, mem_reg->mem_h, | |
635 | (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /** | |
640 | * Unregister (previosuly registered) memory. | |
641 | */ | |
642 | void iser_unreg_mem(struct iser_mem_reg *reg) | |
643 | { | |
644 | int ret; | |
645 | ||
646 | iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); | |
647 | ||
648 | ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); | |
649 | if (ret) | |
650 | iser_err("ib_fmr_pool_unmap failed %d\n", ret); | |
651 | ||
652 | reg->mem_h = NULL; | |
653 | } | |
654 | ||
bcc60c38 OG |
655 | int iser_post_recvl(struct iser_conn *ib_conn) |
656 | { | |
657 | struct ib_recv_wr rx_wr, *rx_wr_failed; | |
658 | struct ib_sge sge; | |
659 | int ib_ret; | |
660 | ||
661 | sge.addr = ib_conn->login_dma; | |
662 | sge.length = ISER_RX_LOGIN_SIZE; | |
663 | sge.lkey = ib_conn->device->mr->lkey; | |
664 | ||
665 | rx_wr.wr_id = (unsigned long)ib_conn->login_buf; | |
666 | rx_wr.sg_list = &sge; | |
667 | rx_wr.num_sge = 1; | |
668 | rx_wr.next = NULL; | |
669 | ||
704315f0 | 670 | ib_conn->post_recv_buf_count++; |
bcc60c38 OG |
671 | ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); |
672 | if (ib_ret) { | |
673 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 674 | ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
675 | } |
676 | return ib_ret; | |
677 | } | |
678 | ||
679 | int iser_post_recvm(struct iser_conn *ib_conn, int count) | |
680 | { | |
681 | struct ib_recv_wr *rx_wr, *rx_wr_failed; | |
682 | int i, ib_ret; | |
683 | unsigned int my_rx_head = ib_conn->rx_desc_head; | |
684 | struct iser_rx_desc *rx_desc; | |
685 | ||
686 | for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { | |
687 | rx_desc = &ib_conn->rx_descs[my_rx_head]; | |
688 | rx_wr->wr_id = (unsigned long)rx_desc; | |
689 | rx_wr->sg_list = &rx_desc->rx_sg; | |
690 | rx_wr->num_sge = 1; | |
691 | rx_wr->next = rx_wr + 1; | |
692 | my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); | |
693 | } | |
694 | ||
695 | rx_wr--; | |
696 | rx_wr->next = NULL; /* mark end of work requests list */ | |
697 | ||
704315f0 | 698 | ib_conn->post_recv_buf_count += count; |
bcc60c38 OG |
699 | ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); |
700 | if (ib_ret) { | |
701 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 702 | ib_conn->post_recv_buf_count -= count; |
bcc60c38 OG |
703 | } else |
704 | ib_conn->rx_desc_head = my_rx_head; | |
705 | return ib_ret; | |
706 | } | |
707 | ||
708 | ||
1cfa0a75 OG |
709 | /** |
710 | * iser_start_send - Initiate a Send DTO operation | |
711 | * | |
712 | * returns 0 on success, -1 on failure | |
713 | */ | |
f19624aa | 714 | int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) |
1cfa0a75 | 715 | { |
f19624aa | 716 | int ib_ret; |
1cfa0a75 | 717 | struct ib_send_wr send_wr, *send_wr_failed; |
1cfa0a75 | 718 | |
f19624aa OG |
719 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
720 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
1cfa0a75 OG |
721 | |
722 | send_wr.next = NULL; | |
723 | send_wr.wr_id = (unsigned long)tx_desc; | |
f19624aa OG |
724 | send_wr.sg_list = tx_desc->tx_sg; |
725 | send_wr.num_sge = tx_desc->num_sge; | |
1cfa0a75 | 726 | send_wr.opcode = IB_WR_SEND; |
f19624aa | 727 | send_wr.send_flags = IB_SEND_SIGNALED; |
1cfa0a75 OG |
728 | |
729 | atomic_inc(&ib_conn->post_send_buf_count); | |
730 | ||
731 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); | |
732 | if (ib_ret) { | |
1cfa0a75 OG |
733 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
734 | atomic_dec(&ib_conn->post_send_buf_count); | |
1cfa0a75 | 735 | } |
f19624aa | 736 | return ib_ret; |
1cfa0a75 OG |
737 | } |
738 | ||
f19624aa | 739 | static void iser_handle_comp_error(struct iser_tx_desc *desc, |
bcc60c38 | 740 | struct iser_conn *ib_conn) |
1cfa0a75 | 741 | { |
78ad0a34 OG |
742 | if (desc && desc->type == ISCSI_TX_DATAOUT) |
743 | kmem_cache_free(ig.desc_cache, desc); | |
1cfa0a75 | 744 | |
704315f0 | 745 | if (ib_conn->post_recv_buf_count == 0 && |
1d426d64 EZ |
746 | atomic_read(&ib_conn->post_send_buf_count) == 0) { |
747 | /* getting here when the state is UP means that the conn is * | |
748 | * being terminated asynchronously from the iSCSI layer's * | |
749 | * perspective. */ | |
750 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
751 | ISER_CONN_TERMINATING)) | |
752 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
753 | ISCSI_ERR_CONN_FAILED); | |
754 | ||
39ff05db OG |
755 | /* no more non completed posts to the QP, complete the |
756 | * termination process w.o worrying on disconnect event */ | |
757 | ib_conn->state = ISER_CONN_DOWN; | |
758 | wake_up_interruptible(&ib_conn->wait); | |
1d426d64 | 759 | } |
1cfa0a75 OG |
760 | } |
761 | ||
78ad0a34 OG |
762 | static int iser_drain_tx_cq(struct iser_device *device) |
763 | { | |
764 | struct ib_cq *cq = device->tx_cq; | |
765 | struct ib_wc wc; | |
f19624aa | 766 | struct iser_tx_desc *tx_desc; |
78ad0a34 OG |
767 | struct iser_conn *ib_conn; |
768 | int completed_tx = 0; | |
769 | ||
770 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
f19624aa | 771 | tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; |
78ad0a34 OG |
772 | ib_conn = wc.qp->qp_context; |
773 | if (wc.status == IB_WC_SUCCESS) { | |
774 | if (wc.opcode == IB_WC_SEND) | |
f19624aa | 775 | iser_snd_completion(tx_desc, ib_conn); |
78ad0a34 OG |
776 | else |
777 | iser_err("expected opcode %d got %d\n", | |
778 | IB_WC_SEND, wc.opcode); | |
779 | } else { | |
780 | iser_err("tx id %llx status %d vend_err %x\n", | |
781 | wc.wr_id, wc.status, wc.vendor_err); | |
782 | atomic_dec(&ib_conn->post_send_buf_count); | |
783 | iser_handle_comp_error(tx_desc, ib_conn); | |
784 | } | |
785 | completed_tx++; | |
786 | } | |
787 | return completed_tx; | |
788 | } | |
789 | ||
790 | ||
1cfa0a75 OG |
791 | static void iser_cq_tasklet_fn(unsigned long data) |
792 | { | |
793 | struct iser_device *device = (struct iser_device *)data; | |
78ad0a34 | 794 | struct ib_cq *cq = device->rx_cq; |
1cfa0a75 | 795 | struct ib_wc wc; |
78ad0a34 | 796 | struct iser_rx_desc *desc; |
1cfa0a75 | 797 | unsigned long xfer_len; |
bcc60c38 | 798 | struct iser_conn *ib_conn; |
78ad0a34 OG |
799 | int completed_tx, completed_rx; |
800 | completed_tx = completed_rx = 0; | |
1cfa0a75 OG |
801 | |
802 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
78ad0a34 | 803 | desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; |
1cfa0a75 | 804 | BUG_ON(desc == NULL); |
bcc60c38 | 805 | ib_conn = wc.qp->qp_context; |
1cfa0a75 | 806 | if (wc.status == IB_WC_SUCCESS) { |
bcc60c38 | 807 | if (wc.opcode == IB_WC_RECV) { |
1cfa0a75 | 808 | xfer_len = (unsigned long)wc.byte_len; |
78ad0a34 OG |
809 | iser_rcv_completion(desc, xfer_len, ib_conn); |
810 | } else | |
811 | iser_err("expected opcode %d got %d\n", | |
812 | IB_WC_RECV, wc.opcode); | |
1cfa0a75 | 813 | } else { |
bcc60c38 | 814 | if (wc.status != IB_WC_WR_FLUSH_ERR) |
78ad0a34 | 815 | iser_err("rx id %llx status %d vend_err %x\n", |
bcc60c38 | 816 | wc.wr_id, wc.status, wc.vendor_err); |
78ad0a34 OG |
817 | ib_conn->post_recv_buf_count--; |
818 | iser_handle_comp_error(NULL, ib_conn); | |
1cfa0a75 | 819 | } |
78ad0a34 OG |
820 | completed_rx++; |
821 | if (!(completed_rx & 63)) | |
822 | completed_tx += iser_drain_tx_cq(device); | |
1cfa0a75 OG |
823 | } |
824 | /* #warning "it is assumed here that arming CQ only once its empty" * | |
825 | * " would not cause interrupts to be missed" */ | |
826 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
78ad0a34 OG |
827 | |
828 | completed_tx += iser_drain_tx_cq(device); | |
829 | iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); | |
1cfa0a75 OG |
830 | } |
831 | ||
832 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
833 | { | |
834 | struct iser_device *device = (struct iser_device *)cq_context; | |
835 | ||
836 | tasklet_schedule(&device->cq_tasklet); | |
837 | } |