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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. | |
28f292e8 | 4 | * Copyright (c) 2013 Mellanox Technologies. All rights reserved. |
1cfa0a75 OG |
5 | * |
6 | * This software is available to you under a choice of one of two | |
7 | * licenses. You may choose to be licensed under the terms of the GNU | |
8 | * General Public License (GPL) Version 2, available from the file | |
9 | * COPYING in the main directory of this source tree, or the | |
10 | * OpenIB.org BSD license below: | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or | |
13 | * without modification, are permitted provided that the following | |
14 | * conditions are met: | |
15 | * | |
16 | * - Redistributions of source code must retain the above | |
17 | * copyright notice, this list of conditions and the following | |
18 | * disclaimer. | |
19 | * | |
20 | * - Redistributions in binary form must reproduce the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer in the documentation and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
26 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
27 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
28 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
29 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
30 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
31 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
32 | * SOFTWARE. | |
1cfa0a75 | 33 | */ |
1cfa0a75 OG |
34 | #include <linux/kernel.h> |
35 | #include <linux/module.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1cfa0a75 | 37 | #include <linux/delay.h> |
1cfa0a75 OG |
38 | |
39 | #include "iscsi_iser.h" | |
40 | ||
41 | #define ISCSI_ISER_MAX_CONN 8 | |
78ad0a34 OG |
42 | #define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
43 | #define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) | |
1cfa0a75 OG |
44 | |
45 | static void iser_cq_tasklet_fn(unsigned long data); | |
46 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context); | |
1cfa0a75 OG |
47 | |
48 | static void iser_cq_event_callback(struct ib_event *cause, void *context) | |
49 | { | |
50 | iser_err("got cq event %d \n", cause->event); | |
51 | } | |
52 | ||
53 | static void iser_qp_event_callback(struct ib_event *cause, void *context) | |
54 | { | |
55 | iser_err("got qp event %d\n",cause->event); | |
56 | } | |
57 | ||
2110f9bf OG |
58 | static void iser_event_handler(struct ib_event_handler *handler, |
59 | struct ib_event *event) | |
60 | { | |
61 | iser_err("async event %d on device %s port %d\n", event->event, | |
62 | event->device->name, event->element.port_num); | |
63 | } | |
64 | ||
1cfa0a75 OG |
65 | /** |
66 | * iser_create_device_ib_res - creates Protection Domain (PD), Completion | |
67 | * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with | |
68 | * the adapator. | |
69 | * | |
70 | * returns 0 on success, -1 on failure | |
71 | */ | |
72 | static int iser_create_device_ib_res(struct iser_device *device) | |
73 | { | |
5a33a669 AT |
74 | int i, j; |
75 | struct iser_cq_desc *cq_desc; | |
5587856c | 76 | struct ib_device_attr *dev_attr; |
5a33a669 | 77 | |
5587856c SG |
78 | dev_attr = kmalloc(sizeof(*dev_attr), GFP_KERNEL); |
79 | if (!dev_attr) | |
80 | return -ENOMEM; | |
81 | ||
82 | if (ib_query_device(device->ib_device, dev_attr)) { | |
83 | pr_warn("Query device failed for %s\n", device->ib_device->name); | |
84 | goto dev_attr_err; | |
85 | } | |
86 | ||
87 | /* Assign function handles - based on FMR support */ | |
88 | if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr && | |
89 | device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) { | |
90 | iser_info("FMR supported, using FMR for registration\n"); | |
91 | device->iser_alloc_rdma_reg_res = iser_create_fmr_pool; | |
92 | device->iser_free_rdma_reg_res = iser_free_fmr_pool; | |
93 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr; | |
94 | device->iser_unreg_rdma_mem = iser_unreg_mem_fmr; | |
95 | } else | |
96 | if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { | |
97 | iser_info("FRWR supported, using FRWR for registration\n"); | |
98 | device->iser_alloc_rdma_reg_res = iser_create_frwr_pool; | |
99 | device->iser_free_rdma_reg_res = iser_free_frwr_pool; | |
100 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_frwr; | |
101 | device->iser_unreg_rdma_mem = iser_unreg_mem_frwr; | |
102 | } else { | |
103 | iser_err("IB device does not support FMRs nor FRWRs, can't register memory\n"); | |
104 | goto dev_attr_err; | |
105 | } | |
b4e155ff | 106 | |
5a33a669 | 107 | device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors); |
4f363882 RD |
108 | iser_info("using %d CQs, device %s supports %d vectors\n", |
109 | device->cqs_used, device->ib_device->name, | |
110 | device->ib_device->num_comp_vectors); | |
5a33a669 AT |
111 | |
112 | device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used, | |
113 | GFP_KERNEL); | |
114 | if (device->cq_desc == NULL) | |
115 | goto cq_desc_err; | |
116 | cq_desc = device->cq_desc; | |
117 | ||
1cfa0a75 OG |
118 | device->pd = ib_alloc_pd(device->ib_device); |
119 | if (IS_ERR(device->pd)) | |
120 | goto pd_err; | |
121 | ||
5a33a669 AT |
122 | for (i = 0; i < device->cqs_used; i++) { |
123 | cq_desc[i].device = device; | |
124 | cq_desc[i].cq_index = i; | |
125 | ||
126 | device->rx_cq[i] = ib_create_cq(device->ib_device, | |
127 | iser_cq_callback, | |
128 | iser_cq_event_callback, | |
129 | (void *)&cq_desc[i], | |
130 | ISER_MAX_RX_CQ_LEN, i); | |
131 | if (IS_ERR(device->rx_cq[i])) | |
132 | goto cq_err; | |
1cfa0a75 | 133 | |
5a33a669 AT |
134 | device->tx_cq[i] = ib_create_cq(device->ib_device, |
135 | NULL, iser_cq_event_callback, | |
136 | (void *)&cq_desc[i], | |
137 | ISER_MAX_TX_CQ_LEN, i); | |
78ad0a34 | 138 | |
5a33a669 AT |
139 | if (IS_ERR(device->tx_cq[i])) |
140 | goto cq_err; | |
78ad0a34 | 141 | |
5a33a669 AT |
142 | if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP)) |
143 | goto cq_err; | |
1cfa0a75 | 144 | |
5a33a669 AT |
145 | tasklet_init(&device->cq_tasklet[i], |
146 | iser_cq_tasklet_fn, | |
147 | (unsigned long)&cq_desc[i]); | |
148 | } | |
1cfa0a75 | 149 | |
d8111028 EZ |
150 | device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
151 | IB_ACCESS_REMOTE_WRITE | | |
152 | IB_ACCESS_REMOTE_READ); | |
1cfa0a75 OG |
153 | if (IS_ERR(device->mr)) |
154 | goto dma_mr_err; | |
155 | ||
2110f9bf OG |
156 | INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, |
157 | iser_event_handler); | |
158 | if (ib_register_event_handler(&device->event_handler)) | |
159 | goto handler_err; | |
160 | ||
5587856c | 161 | kfree(dev_attr); |
1cfa0a75 OG |
162 | return 0; |
163 | ||
2110f9bf OG |
164 | handler_err: |
165 | ib_dereg_mr(device->mr); | |
1cfa0a75 | 166 | dma_mr_err: |
5a33a669 AT |
167 | for (j = 0; j < device->cqs_used; j++) |
168 | tasklet_kill(&device->cq_tasklet[j]); | |
169 | cq_err: | |
170 | for (j = 0; j < i; j++) { | |
171 | if (device->tx_cq[j]) | |
172 | ib_destroy_cq(device->tx_cq[j]); | |
173 | if (device->rx_cq[j]) | |
174 | ib_destroy_cq(device->rx_cq[j]); | |
175 | } | |
1cfa0a75 OG |
176 | ib_dealloc_pd(device->pd); |
177 | pd_err: | |
5a33a669 AT |
178 | kfree(device->cq_desc); |
179 | cq_desc_err: | |
1cfa0a75 | 180 | iser_err("failed to allocate an IB resource\n"); |
5587856c SG |
181 | dev_attr_err: |
182 | kfree(dev_attr); | |
1cfa0a75 OG |
183 | return -1; |
184 | } | |
185 | ||
186 | /** | |
38dc732f | 187 | * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
1cfa0a75 OG |
188 | * CQ and PD created with the device associated with the adapator. |
189 | */ | |
190 | static void iser_free_device_ib_res(struct iser_device *device) | |
191 | { | |
5a33a669 | 192 | int i; |
1cfa0a75 OG |
193 | BUG_ON(device->mr == NULL); |
194 | ||
5a33a669 AT |
195 | for (i = 0; i < device->cqs_used; i++) { |
196 | tasklet_kill(&device->cq_tasklet[i]); | |
197 | (void)ib_destroy_cq(device->tx_cq[i]); | |
198 | (void)ib_destroy_cq(device->rx_cq[i]); | |
199 | device->tx_cq[i] = NULL; | |
200 | device->rx_cq[i] = NULL; | |
201 | } | |
202 | ||
2110f9bf | 203 | (void)ib_unregister_event_handler(&device->event_handler); |
1cfa0a75 | 204 | (void)ib_dereg_mr(device->mr); |
1cfa0a75 OG |
205 | (void)ib_dealloc_pd(device->pd); |
206 | ||
5a33a669 AT |
207 | kfree(device->cq_desc); |
208 | ||
1cfa0a75 | 209 | device->mr = NULL; |
1cfa0a75 OG |
210 | device->pd = NULL; |
211 | } | |
212 | ||
213 | /** | |
986db0d6 | 214 | * iser_create_fmr_pool - Creates FMR pool and page_vector |
1cfa0a75 | 215 | * |
986db0d6 | 216 | * returns 0 on success, or errno code on failure |
1cfa0a75 | 217 | */ |
b7f04513 | 218 | int iser_create_fmr_pool(struct iser_conn *ib_conn, unsigned cmds_max) |
1cfa0a75 | 219 | { |
986db0d6 | 220 | struct iser_device *device = ib_conn->device; |
1cfa0a75 | 221 | struct ib_fmr_pool_param params; |
986db0d6 | 222 | int ret = -ENOMEM; |
bcc60c38 | 223 | |
e657571b SG |
224 | ib_conn->fastreg.fmr.page_vec = kmalloc(sizeof(struct iser_page_vec) + |
225 | (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)), | |
226 | GFP_KERNEL); | |
227 | if (!ib_conn->fastreg.fmr.page_vec) | |
986db0d6 | 228 | return ret; |
9fda1ac5 | 229 | |
e657571b | 230 | ib_conn->fastreg.fmr.page_vec->pages = (u64 *)(ib_conn->fastreg.fmr.page_vec + 1); |
1cfa0a75 | 231 | |
8dfa0876 | 232 | params.page_shift = SHIFT_4K; |
1cfa0a75 OG |
233 | /* when the first/last SG element are not start/end * |
234 | * page aligned, the map whould be of N+1 pages */ | |
235 | params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; | |
236 | /* make the pool size twice the max number of SCSI commands * | |
237 | * the ML is expected to queue, watermark for unmap at 50% */ | |
b7f04513 SP |
238 | params.pool_size = cmds_max * 2; |
239 | params.dirty_watermark = cmds_max; | |
1cfa0a75 OG |
240 | params.cache = 0; |
241 | params.flush_function = NULL; | |
242 | params.access = (IB_ACCESS_LOCAL_WRITE | | |
243 | IB_ACCESS_REMOTE_WRITE | | |
244 | IB_ACCESS_REMOTE_READ); | |
245 | ||
e657571b SG |
246 | ib_conn->fastreg.fmr.pool = ib_create_fmr_pool(device->pd, ¶ms); |
247 | if (!IS_ERR(ib_conn->fastreg.fmr.pool)) | |
986db0d6 SP |
248 | return 0; |
249 | ||
250 | /* no FMR => no need for page_vec */ | |
e657571b SG |
251 | kfree(ib_conn->fastreg.fmr.page_vec); |
252 | ib_conn->fastreg.fmr.page_vec = NULL; | |
986db0d6 | 253 | |
e657571b SG |
254 | ret = PTR_ERR(ib_conn->fastreg.fmr.pool); |
255 | ib_conn->fastreg.fmr.pool = NULL; | |
986db0d6 SP |
256 | if (ret != -ENOSYS) { |
257 | iser_err("FMR allocation failed, err %d\n", ret); | |
258 | return ret; | |
259 | } else { | |
5525d210 | 260 | iser_warn("FMRs are not supported, using unaligned mode\n"); |
986db0d6 | 261 | return 0; |
1cfa0a75 | 262 | } |
986db0d6 SP |
263 | } |
264 | ||
265 | /** | |
266 | * iser_free_fmr_pool - releases the FMR pool and page vec | |
267 | */ | |
268 | void iser_free_fmr_pool(struct iser_conn *ib_conn) | |
269 | { | |
270 | iser_info("freeing conn %p fmr pool %p\n", | |
e657571b | 271 | ib_conn, ib_conn->fastreg.fmr.pool); |
986db0d6 | 272 | |
e657571b SG |
273 | if (ib_conn->fastreg.fmr.pool != NULL) |
274 | ib_destroy_fmr_pool(ib_conn->fastreg.fmr.pool); | |
986db0d6 | 275 | |
e657571b | 276 | ib_conn->fastreg.fmr.pool = NULL; |
986db0d6 | 277 | |
e657571b SG |
278 | kfree(ib_conn->fastreg.fmr.page_vec); |
279 | ib_conn->fastreg.fmr.page_vec = NULL; | |
986db0d6 SP |
280 | } |
281 | ||
5587856c SG |
282 | /** |
283 | * iser_create_frwr_pool - Creates pool of fast_reg descriptors | |
284 | * for fast registration work requests. | |
285 | * returns 0 on success, or errno code on failure | |
286 | */ | |
287 | int iser_create_frwr_pool(struct iser_conn *ib_conn, unsigned cmds_max) | |
288 | { | |
289 | struct iser_device *device = ib_conn->device; | |
290 | struct fast_reg_descriptor *desc; | |
291 | int i, ret; | |
292 | ||
293 | INIT_LIST_HEAD(&ib_conn->fastreg.frwr.pool); | |
294 | ib_conn->fastreg.frwr.pool_size = 0; | |
295 | for (i = 0; i < cmds_max; i++) { | |
296 | desc = kmalloc(sizeof(*desc), GFP_KERNEL); | |
297 | if (!desc) { | |
298 | iser_err("Failed to allocate a new fast_reg descriptor\n"); | |
299 | ret = -ENOMEM; | |
300 | goto err; | |
301 | } | |
302 | ||
303 | desc->data_frpl = ib_alloc_fast_reg_page_list(device->ib_device, | |
304 | ISCSI_ISER_SG_TABLESIZE + 1); | |
305 | if (IS_ERR(desc->data_frpl)) { | |
306 | ret = PTR_ERR(desc->data_frpl); | |
307 | iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n", ret); | |
27ae2d1e | 308 | goto fast_reg_page_failure; |
5587856c SG |
309 | } |
310 | ||
311 | desc->data_mr = ib_alloc_fast_reg_mr(device->pd, | |
312 | ISCSI_ISER_SG_TABLESIZE + 1); | |
313 | if (IS_ERR(desc->data_mr)) { | |
314 | ret = PTR_ERR(desc->data_mr); | |
315 | iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); | |
27ae2d1e | 316 | goto fast_reg_mr_failure; |
5587856c SG |
317 | } |
318 | desc->valid = true; | |
319 | list_add_tail(&desc->list, &ib_conn->fastreg.frwr.pool); | |
320 | ib_conn->fastreg.frwr.pool_size++; | |
321 | } | |
322 | ||
323 | return 0; | |
27ae2d1e RD |
324 | |
325 | fast_reg_mr_failure: | |
326 | ib_free_fast_reg_page_list(desc->data_frpl); | |
327 | fast_reg_page_failure: | |
328 | kfree(desc); | |
5587856c SG |
329 | err: |
330 | iser_free_frwr_pool(ib_conn); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | /** | |
335 | * iser_free_frwr_pool - releases the pool of fast_reg descriptors | |
336 | */ | |
337 | void iser_free_frwr_pool(struct iser_conn *ib_conn) | |
338 | { | |
339 | struct fast_reg_descriptor *desc, *tmp; | |
340 | int i = 0; | |
341 | ||
342 | if (list_empty(&ib_conn->fastreg.frwr.pool)) | |
343 | return; | |
344 | ||
345 | iser_info("freeing conn %p frwr pool\n", ib_conn); | |
346 | ||
347 | list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.frwr.pool, list) { | |
348 | list_del(&desc->list); | |
349 | ib_free_fast_reg_page_list(desc->data_frpl); | |
350 | ib_dereg_mr(desc->data_mr); | |
351 | kfree(desc); | |
352 | ++i; | |
353 | } | |
354 | ||
355 | if (i < ib_conn->fastreg.frwr.pool_size) | |
356 | iser_warn("pool still has %d regions registered\n", | |
357 | ib_conn->fastreg.frwr.pool_size - i); | |
358 | } | |
359 | ||
986db0d6 SP |
360 | /** |
361 | * iser_create_ib_conn_res - Queue-Pair (QP) | |
362 | * | |
363 | * returns 0 on success, -1 on failure | |
364 | */ | |
365 | static int iser_create_ib_conn_res(struct iser_conn *ib_conn) | |
366 | { | |
367 | struct iser_device *device; | |
368 | struct ib_qp_init_attr init_attr; | |
369 | int ret = -ENOMEM; | |
370 | int index, min_index = 0; | |
371 | ||
372 | BUG_ON(ib_conn->device == NULL); | |
373 | ||
374 | device = ib_conn->device; | |
1cfa0a75 OG |
375 | |
376 | memset(&init_attr, 0, sizeof init_attr); | |
377 | ||
5a33a669 AT |
378 | mutex_lock(&ig.connlist_mutex); |
379 | /* select the CQ with the minimal number of usages */ | |
380 | for (index = 0; index < device->cqs_used; index++) | |
381 | if (device->cq_active_qps[index] < | |
382 | device->cq_active_qps[min_index]) | |
383 | min_index = index; | |
384 | device->cq_active_qps[min_index]++; | |
385 | mutex_unlock(&ig.connlist_mutex); | |
4f363882 | 386 | iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); |
5a33a669 | 387 | |
1cfa0a75 OG |
388 | init_attr.event_handler = iser_qp_event_callback; |
389 | init_attr.qp_context = (void *)ib_conn; | |
5a33a669 AT |
390 | init_attr.send_cq = device->tx_cq[min_index]; |
391 | init_attr.recv_cq = device->rx_cq[min_index]; | |
1cfa0a75 OG |
392 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; |
393 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; | |
f19624aa | 394 | init_attr.cap.max_send_sge = 2; |
bcc60c38 | 395 | init_attr.cap.max_recv_sge = 1; |
1cfa0a75 OG |
396 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
397 | init_attr.qp_type = IB_QPT_RC; | |
398 | ||
399 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); | |
400 | if (ret) | |
9fda1ac5 | 401 | goto out_err; |
1cfa0a75 OG |
402 | |
403 | ib_conn->qp = ib_conn->cma_id->qp; | |
986db0d6 | 404 | iser_info("setting conn %p cma_id %p qp %p\n", |
4f363882 | 405 | ib_conn, ib_conn->cma_id, |
986db0d6 | 406 | ib_conn->cma_id->qp); |
1cfa0a75 OG |
407 | return ret; |
408 | ||
9fda1ac5 | 409 | out_err: |
1cfa0a75 OG |
410 | iser_err("unable to alloc mem or create resource, err %d\n", ret); |
411 | return ret; | |
412 | } | |
413 | ||
414 | /** | |
986db0d6 | 415 | * releases the QP objects, returns 0 on success, |
1cfa0a75 OG |
416 | * -1 on failure |
417 | */ | |
5b61ff43 | 418 | static int iser_free_ib_conn_res(struct iser_conn *ib_conn) |
1cfa0a75 | 419 | { |
5a33a669 | 420 | int cq_index; |
1cfa0a75 OG |
421 | BUG_ON(ib_conn == NULL); |
422 | ||
986db0d6 | 423 | iser_info("freeing conn %p cma_id %p qp %p\n", |
4f363882 | 424 | ib_conn, ib_conn->cma_id, |
986db0d6 | 425 | ib_conn->qp); |
1cfa0a75 OG |
426 | |
427 | /* qp is created only once both addr & route are resolved */ | |
1cfa0a75 | 428 | |
5a33a669 AT |
429 | if (ib_conn->qp != NULL) { |
430 | cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index; | |
431 | ib_conn->device->cq_active_qps[cq_index]--; | |
1cfa0a75 | 432 | |
5a33a669 AT |
433 | rdma_destroy_qp(ib_conn->cma_id); |
434 | } | |
1cfa0a75 | 435 | |
1cfa0a75 | 436 | ib_conn->qp = NULL; |
d474186f | 437 | |
1cfa0a75 OG |
438 | return 0; |
439 | } | |
440 | ||
441 | /** | |
442 | * based on the resolved device node GUID see if there already allocated | |
443 | * device for this device. If there's no such, create one. | |
444 | */ | |
445 | static | |
446 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
447 | { | |
9a378270 | 448 | struct iser_device *device; |
1cfa0a75 OG |
449 | |
450 | mutex_lock(&ig.device_list_mutex); | |
451 | ||
9a378270 | 452 | list_for_each_entry(device, &ig.device_list, ig_list) |
1cfa0a75 OG |
453 | /* find if there's a match using the node GUID */ |
454 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
d33ed425 | 455 | goto inc_refcnt; |
9a378270 AR |
456 | |
457 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
458 | if (device == NULL) | |
459 | goto out; | |
460 | ||
461 | /* assign this device to the device */ | |
462 | device->ib_device = cma_id->device; | |
463 | /* init the device and link it into ig device list */ | |
464 | if (iser_create_device_ib_res(device)) { | |
465 | kfree(device); | |
466 | device = NULL; | |
467 | goto out; | |
1cfa0a75 | 468 | } |
9a378270 AR |
469 | list_add(&device->ig_list, &ig.device_list); |
470 | ||
d33ed425 | 471 | inc_refcnt: |
1cfa0a75 | 472 | device->refcount++; |
d33ed425 | 473 | out: |
1cfa0a75 OG |
474 | mutex_unlock(&ig.device_list_mutex); |
475 | return device; | |
476 | } | |
477 | ||
478 | /* if there's no demand for this device, release it */ | |
479 | static void iser_device_try_release(struct iser_device *device) | |
480 | { | |
481 | mutex_lock(&ig.device_list_mutex); | |
482 | device->refcount--; | |
4f363882 | 483 | iser_info("device %p refcount %d\n", device, device->refcount); |
1cfa0a75 OG |
484 | if (!device->refcount) { |
485 | iser_free_device_ib_res(device); | |
486 | list_del(&device->ig_list); | |
487 | kfree(device); | |
488 | } | |
489 | mutex_unlock(&ig.device_list_mutex); | |
490 | } | |
491 | ||
1cfa0a75 OG |
492 | static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, |
493 | enum iser_ib_conn_state comp, | |
494 | enum iser_ib_conn_state exch) | |
495 | { | |
496 | int ret; | |
497 | ||
498 | spin_lock_bh(&ib_conn->lock); | |
499 | if ((ret = (ib_conn->state == comp))) | |
500 | ib_conn->state = exch; | |
501 | spin_unlock_bh(&ib_conn->lock); | |
502 | return ret; | |
503 | } | |
504 | ||
41179e2d RD |
505 | /** |
506 | * Frees all conn objects and deallocs conn descriptor | |
507 | */ | |
39ff05db | 508 | static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id) |
41179e2d RD |
509 | { |
510 | struct iser_device *device = ib_conn->device; | |
511 | ||
512 | BUG_ON(ib_conn->state != ISER_CONN_DOWN); | |
513 | ||
514 | mutex_lock(&ig.connlist_mutex); | |
515 | list_del(&ib_conn->conn_list); | |
516 | mutex_unlock(&ig.connlist_mutex); | |
bcc60c38 | 517 | iser_free_rx_descriptors(ib_conn); |
5b61ff43 | 518 | iser_free_ib_conn_res(ib_conn); |
41179e2d RD |
519 | ib_conn->device = NULL; |
520 | /* on EVENT_ADDR_ERROR there's no device yet for this conn */ | |
521 | if (device != NULL) | |
522 | iser_device_try_release(device); | |
5b61ff43 RD |
523 | /* if cma handler context, the caller actually destroy the id */ |
524 | if (ib_conn->cma_id != NULL && can_destroy_id) { | |
525 | rdma_destroy_id(ib_conn->cma_id); | |
526 | ib_conn->cma_id = NULL; | |
527 | } | |
412eeafa | 528 | iscsi_destroy_endpoint(ib_conn->ep); |
41179e2d RD |
529 | } |
530 | ||
b40977d9 MC |
531 | void iser_conn_get(struct iser_conn *ib_conn) |
532 | { | |
533 | atomic_inc(&ib_conn->refcount); | |
534 | } | |
535 | ||
39ff05db | 536 | int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id) |
b40977d9 | 537 | { |
39ff05db OG |
538 | if (atomic_dec_and_test(&ib_conn->refcount)) { |
539 | iser_conn_release(ib_conn, can_destroy_id); | |
540 | return 1; | |
541 | } | |
542 | return 0; | |
41179e2d RD |
543 | } |
544 | ||
1cfa0a75 OG |
545 | /** |
546 | * triggers start of the disconnect procedures and wait for them to be done | |
547 | */ | |
548 | void iser_conn_terminate(struct iser_conn *ib_conn) | |
549 | { | |
550 | int err = 0; | |
551 | ||
552 | /* change the ib conn state only if the conn is UP, however always call | |
553 | * rdma_disconnect since this is the only way to cause the CMA to change | |
554 | * the QP state to ERROR | |
555 | */ | |
556 | ||
557 | iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); | |
558 | err = rdma_disconnect(ib_conn->cma_id); | |
559 | if (err) | |
560 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
561 | ib_conn,err); | |
562 | ||
563 | wait_event_interruptible(ib_conn->wait, | |
564 | ib_conn->state == ISER_CONN_DOWN); | |
565 | ||
39ff05db | 566 | iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ |
1cfa0a75 OG |
567 | } |
568 | ||
39ff05db | 569 | static int iser_connect_error(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
570 | { |
571 | struct iser_conn *ib_conn; | |
572 | ib_conn = (struct iser_conn *)cma_id->context; | |
573 | ||
574 | ib_conn->state = ISER_CONN_DOWN; | |
575 | wake_up_interruptible(&ib_conn->wait); | |
39ff05db | 576 | return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ |
1cfa0a75 OG |
577 | } |
578 | ||
39ff05db | 579 | static int iser_addr_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
580 | { |
581 | struct iser_device *device; | |
582 | struct iser_conn *ib_conn; | |
583 | int ret; | |
584 | ||
585 | device = iser_device_find_by_ib_device(cma_id); | |
d33ed425 AR |
586 | if (!device) { |
587 | iser_err("device lookup/creation failed\n"); | |
39ff05db | 588 | return iser_connect_error(cma_id); |
d33ed425 AR |
589 | } |
590 | ||
1cfa0a75 OG |
591 | ib_conn = (struct iser_conn *)cma_id->context; |
592 | ib_conn->device = device; | |
593 | ||
594 | ret = rdma_resolve_route(cma_id, 1000); | |
595 | if (ret) { | |
596 | iser_err("resolve route failed: %d\n", ret); | |
39ff05db | 597 | return iser_connect_error(cma_id); |
1cfa0a75 | 598 | } |
39ff05db OG |
599 | |
600 | return 0; | |
1cfa0a75 OG |
601 | } |
602 | ||
39ff05db | 603 | static int iser_route_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
604 | { |
605 | struct rdma_conn_param conn_param; | |
606 | int ret; | |
8d8399de | 607 | struct iser_cm_hdr req_hdr; |
1cfa0a75 OG |
608 | |
609 | ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); | |
610 | if (ret) | |
611 | goto failure; | |
612 | ||
1cfa0a75 OG |
613 | memset(&conn_param, 0, sizeof conn_param); |
614 | conn_param.responder_resources = 4; | |
615 | conn_param.initiator_depth = 1; | |
616 | conn_param.retry_count = 7; | |
617 | conn_param.rnr_retry_count = 6; | |
618 | ||
8d8399de OG |
619 | memset(&req_hdr, 0, sizeof(req_hdr)); |
620 | req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED | | |
621 | ISER_SEND_W_INV_NOT_SUPPORTED); | |
622 | conn_param.private_data = (void *)&req_hdr; | |
623 | conn_param.private_data_len = sizeof(struct iser_cm_hdr); | |
624 | ||
1cfa0a75 OG |
625 | ret = rdma_connect(cma_id, &conn_param); |
626 | if (ret) { | |
627 | iser_err("failure connecting: %d\n", ret); | |
628 | goto failure; | |
629 | } | |
630 | ||
39ff05db | 631 | return 0; |
1cfa0a75 | 632 | failure: |
39ff05db | 633 | return iser_connect_error(cma_id); |
1cfa0a75 OG |
634 | } |
635 | ||
636 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
637 | { | |
638 | struct iser_conn *ib_conn; | |
639 | ||
640 | ib_conn = (struct iser_conn *)cma_id->context; | |
641 | ib_conn->state = ISER_CONN_UP; | |
642 | wake_up_interruptible(&ib_conn->wait); | |
643 | } | |
644 | ||
39ff05db | 645 | static int iser_disconnected_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
646 | { |
647 | struct iser_conn *ib_conn; | |
39ff05db | 648 | int ret; |
1cfa0a75 OG |
649 | |
650 | ib_conn = (struct iser_conn *)cma_id->context; | |
1cfa0a75 OG |
651 | |
652 | /* getting here when the state is UP means that the conn is being * | |
653 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
654 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
7d9eacf9 RD |
655 | ISER_CONN_TERMINATING)){ |
656 | if (ib_conn->iser_conn) | |
657 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
658 | ISCSI_ERR_CONN_FAILED); | |
659 | else | |
660 | iser_err("iscsi_iser connection isn't bound\n"); | |
661 | } | |
1cfa0a75 OG |
662 | |
663 | /* Complete the termination process if no posts are pending */ | |
704315f0 | 664 | if (ib_conn->post_recv_buf_count == 0 && |
1cfa0a75 OG |
665 | (atomic_read(&ib_conn->post_send_buf_count) == 0)) { |
666 | ib_conn->state = ISER_CONN_DOWN; | |
667 | wake_up_interruptible(&ib_conn->wait); | |
668 | } | |
39ff05db OG |
669 | |
670 | ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ | |
671 | return ret; | |
1cfa0a75 OG |
672 | } |
673 | ||
674 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
675 | { | |
676 | int ret = 0; | |
677 | ||
4f363882 RD |
678 | iser_info("event %d status %d conn %p id %p\n", |
679 | event->event, event->status, cma_id->context, cma_id); | |
1cfa0a75 OG |
680 | |
681 | switch (event->event) { | |
682 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
39ff05db | 683 | ret = iser_addr_handler(cma_id); |
1cfa0a75 OG |
684 | break; |
685 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
39ff05db | 686 | ret = iser_route_handler(cma_id); |
1cfa0a75 OG |
687 | break; |
688 | case RDMA_CM_EVENT_ESTABLISHED: | |
689 | iser_connected_handler(cma_id); | |
690 | break; | |
691 | case RDMA_CM_EVENT_ADDR_ERROR: | |
692 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
693 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
694 | case RDMA_CM_EVENT_UNREACHABLE: | |
695 | case RDMA_CM_EVENT_REJECTED: | |
39ff05db | 696 | ret = iser_connect_error(cma_id); |
1cfa0a75 OG |
697 | break; |
698 | case RDMA_CM_EVENT_DISCONNECTED: | |
1cfa0a75 | 699 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
2f5de151 | 700 | case RDMA_CM_EVENT_ADDR_CHANGE: |
39ff05db | 701 | ret = iser_disconnected_handler(cma_id); |
1cfa0a75 | 702 | break; |
1cfa0a75 | 703 | default: |
a4ef1451 | 704 | iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
1cfa0a75 OG |
705 | break; |
706 | } | |
707 | return ret; | |
708 | } | |
709 | ||
412eeafa | 710 | void iser_conn_init(struct iser_conn *ib_conn) |
1cfa0a75 | 711 | { |
1cfa0a75 OG |
712 | ib_conn->state = ISER_CONN_INIT; |
713 | init_waitqueue_head(&ib_conn->wait); | |
704315f0 | 714 | ib_conn->post_recv_buf_count = 0; |
1cfa0a75 | 715 | atomic_set(&ib_conn->post_send_buf_count, 0); |
39ff05db | 716 | atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */ |
1cfa0a75 OG |
717 | INIT_LIST_HEAD(&ib_conn->conn_list); |
718 | spin_lock_init(&ib_conn->lock); | |
1cfa0a75 OG |
719 | } |
720 | ||
721 | /** | |
722 | * starts the process of connecting to the target | |
94e2bd68 | 723 | * sleeps until the connection is established or rejected |
1cfa0a75 OG |
724 | */ |
725 | int iser_connect(struct iser_conn *ib_conn, | |
726 | struct sockaddr_in *src_addr, | |
727 | struct sockaddr_in *dst_addr, | |
728 | int non_blocking) | |
729 | { | |
730 | struct sockaddr *src, *dst; | |
731 | int err = 0; | |
732 | ||
63779436 HH |
733 | sprintf(ib_conn->name, "%pI4:%d", |
734 | &dst_addr->sin_addr.s_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
735 | |
736 | /* the device is known only --after-- address resolution */ | |
737 | ib_conn->device = NULL; | |
738 | ||
4f363882 RD |
739 | iser_info("connecting to: %pI4, port 0x%x\n", |
740 | &dst_addr->sin_addr, dst_addr->sin_port); | |
1cfa0a75 OG |
741 | |
742 | ib_conn->state = ISER_CONN_PENDING; | |
743 | ||
39ff05db | 744 | iser_conn_get(ib_conn); /* ref ib conn's cma id */ |
1cfa0a75 OG |
745 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, |
746 | (void *)ib_conn, | |
b26f9b99 | 747 | RDMA_PS_TCP, IB_QPT_RC); |
1cfa0a75 OG |
748 | if (IS_ERR(ib_conn->cma_id)) { |
749 | err = PTR_ERR(ib_conn->cma_id); | |
750 | iser_err("rdma_create_id failed: %d\n", err); | |
751 | goto id_failure; | |
752 | } | |
753 | ||
754 | src = (struct sockaddr *)src_addr; | |
755 | dst = (struct sockaddr *)dst_addr; | |
756 | err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); | |
757 | if (err) { | |
758 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
759 | goto addr_failure; | |
760 | } | |
761 | ||
762 | if (!non_blocking) { | |
763 | wait_event_interruptible(ib_conn->wait, | |
764 | (ib_conn->state != ISER_CONN_PENDING)); | |
765 | ||
766 | if (ib_conn->state != ISER_CONN_UP) { | |
767 | err = -EIO; | |
768 | goto connect_failure; | |
769 | } | |
770 | } | |
771 | ||
772 | mutex_lock(&ig.connlist_mutex); | |
773 | list_add(&ib_conn->conn_list, &ig.connlist); | |
774 | mutex_unlock(&ig.connlist_mutex); | |
775 | return 0; | |
776 | ||
777 | id_failure: | |
778 | ib_conn->cma_id = NULL; | |
779 | addr_failure: | |
780 | ib_conn->state = ISER_CONN_DOWN; | |
7d9c0de4 | 781 | iser_conn_put(ib_conn, 1); /* deref ib conn's cma id */ |
1cfa0a75 | 782 | connect_failure: |
7d9c0de4 | 783 | iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ |
1cfa0a75 OG |
784 | return err; |
785 | } | |
786 | ||
1cfa0a75 OG |
787 | /** |
788 | * iser_reg_page_vec - Register physical memory | |
789 | * | |
790 | * returns: 0 on success, errno code on failure | |
791 | */ | |
792 | int iser_reg_page_vec(struct iser_conn *ib_conn, | |
793 | struct iser_page_vec *page_vec, | |
794 | struct iser_mem_reg *mem_reg) | |
795 | { | |
796 | struct ib_pool_fmr *mem; | |
797 | u64 io_addr; | |
798 | u64 *page_list; | |
799 | int status; | |
800 | ||
801 | page_list = page_vec->pages; | |
802 | io_addr = page_list[0]; | |
803 | ||
e657571b | 804 | mem = ib_fmr_pool_map_phys(ib_conn->fastreg.fmr.pool, |
1cfa0a75 OG |
805 | page_list, |
806 | page_vec->length, | |
adfaa888 | 807 | io_addr); |
1cfa0a75 OG |
808 | |
809 | if (IS_ERR(mem)) { | |
810 | status = (int)PTR_ERR(mem); | |
811 | iser_err("ib_fmr_pool_map_phys failed: %d\n", status); | |
812 | return status; | |
813 | } | |
814 | ||
815 | mem_reg->lkey = mem->fmr->lkey; | |
816 | mem_reg->rkey = mem->fmr->rkey; | |
8dfa0876 | 817 | mem_reg->len = page_vec->length * SIZE_4K; |
1cfa0a75 | 818 | mem_reg->va = io_addr; |
5587856c | 819 | mem_reg->is_mr = 1; |
1cfa0a75 OG |
820 | mem_reg->mem_h = (void *)mem; |
821 | ||
822 | mem_reg->va += page_vec->offset; | |
823 | mem_reg->len = page_vec->data_size; | |
824 | ||
825 | iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " | |
826 | "entry[0]: (0x%08lx,%ld)] -> " | |
827 | "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", | |
828 | page_vec, page_vec->length, | |
829 | (unsigned long)page_vec->pages[0], | |
830 | (unsigned long)page_vec->data_size, | |
831 | (unsigned int)mem_reg->lkey, mem_reg->mem_h, | |
832 | (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); | |
833 | return 0; | |
834 | } | |
835 | ||
836 | /** | |
e657571b SG |
837 | * Unregister (previosuly registered using FMR) memory. |
838 | * If memory is non-FMR does nothing. | |
1cfa0a75 | 839 | */ |
e657571b SG |
840 | void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
841 | enum iser_data_dir cmd_dir) | |
1cfa0a75 | 842 | { |
b4e155ff | 843 | struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; |
1cfa0a75 OG |
844 | int ret; |
845 | ||
5587856c | 846 | if (!reg->is_mr) |
b4e155ff SG |
847 | return; |
848 | ||
1cfa0a75 OG |
849 | iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); |
850 | ||
851 | ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); | |
852 | if (ret) | |
853 | iser_err("ib_fmr_pool_unmap failed %d\n", ret); | |
854 | ||
855 | reg->mem_h = NULL; | |
856 | } | |
857 | ||
5587856c SG |
858 | void iser_unreg_mem_frwr(struct iscsi_iser_task *iser_task, |
859 | enum iser_data_dir cmd_dir) | |
860 | { | |
861 | struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; | |
862 | struct iser_conn *ib_conn = iser_task->iser_conn->ib_conn; | |
863 | struct fast_reg_descriptor *desc = reg->mem_h; | |
864 | ||
865 | if (!reg->is_mr) | |
866 | return; | |
867 | ||
868 | reg->mem_h = NULL; | |
869 | reg->is_mr = 0; | |
870 | spin_lock_bh(&ib_conn->lock); | |
871 | list_add_tail(&desc->list, &ib_conn->fastreg.frwr.pool); | |
872 | spin_unlock_bh(&ib_conn->lock); | |
873 | } | |
874 | ||
bcc60c38 OG |
875 | int iser_post_recvl(struct iser_conn *ib_conn) |
876 | { | |
877 | struct ib_recv_wr rx_wr, *rx_wr_failed; | |
878 | struct ib_sge sge; | |
879 | int ib_ret; | |
880 | ||
2c4ce609 | 881 | sge.addr = ib_conn->login_resp_dma; |
bcc60c38 OG |
882 | sge.length = ISER_RX_LOGIN_SIZE; |
883 | sge.lkey = ib_conn->device->mr->lkey; | |
884 | ||
2c4ce609 | 885 | rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf; |
bcc60c38 OG |
886 | rx_wr.sg_list = &sge; |
887 | rx_wr.num_sge = 1; | |
888 | rx_wr.next = NULL; | |
889 | ||
704315f0 | 890 | ib_conn->post_recv_buf_count++; |
bcc60c38 OG |
891 | ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); |
892 | if (ib_ret) { | |
893 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 894 | ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
895 | } |
896 | return ib_ret; | |
897 | } | |
898 | ||
899 | int iser_post_recvm(struct iser_conn *ib_conn, int count) | |
900 | { | |
901 | struct ib_recv_wr *rx_wr, *rx_wr_failed; | |
902 | int i, ib_ret; | |
903 | unsigned int my_rx_head = ib_conn->rx_desc_head; | |
904 | struct iser_rx_desc *rx_desc; | |
905 | ||
906 | for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { | |
907 | rx_desc = &ib_conn->rx_descs[my_rx_head]; | |
908 | rx_wr->wr_id = (unsigned long)rx_desc; | |
909 | rx_wr->sg_list = &rx_desc->rx_sg; | |
910 | rx_wr->num_sge = 1; | |
911 | rx_wr->next = rx_wr + 1; | |
b7f04513 | 912 | my_rx_head = (my_rx_head + 1) & ib_conn->qp_max_recv_dtos_mask; |
bcc60c38 OG |
913 | } |
914 | ||
915 | rx_wr--; | |
916 | rx_wr->next = NULL; /* mark end of work requests list */ | |
917 | ||
704315f0 | 918 | ib_conn->post_recv_buf_count += count; |
bcc60c38 OG |
919 | ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); |
920 | if (ib_ret) { | |
921 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 922 | ib_conn->post_recv_buf_count -= count; |
bcc60c38 OG |
923 | } else |
924 | ib_conn->rx_desc_head = my_rx_head; | |
925 | return ib_ret; | |
926 | } | |
927 | ||
928 | ||
1cfa0a75 OG |
929 | /** |
930 | * iser_start_send - Initiate a Send DTO operation | |
931 | * | |
932 | * returns 0 on success, -1 on failure | |
933 | */ | |
f19624aa | 934 | int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) |
1cfa0a75 | 935 | { |
f19624aa | 936 | int ib_ret; |
1cfa0a75 | 937 | struct ib_send_wr send_wr, *send_wr_failed; |
1cfa0a75 | 938 | |
f19624aa OG |
939 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
940 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
1cfa0a75 OG |
941 | |
942 | send_wr.next = NULL; | |
943 | send_wr.wr_id = (unsigned long)tx_desc; | |
f19624aa OG |
944 | send_wr.sg_list = tx_desc->tx_sg; |
945 | send_wr.num_sge = tx_desc->num_sge; | |
1cfa0a75 | 946 | send_wr.opcode = IB_WR_SEND; |
f19624aa | 947 | send_wr.send_flags = IB_SEND_SIGNALED; |
1cfa0a75 OG |
948 | |
949 | atomic_inc(&ib_conn->post_send_buf_count); | |
950 | ||
951 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); | |
952 | if (ib_ret) { | |
1cfa0a75 OG |
953 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
954 | atomic_dec(&ib_conn->post_send_buf_count); | |
1cfa0a75 | 955 | } |
f19624aa | 956 | return ib_ret; |
1cfa0a75 OG |
957 | } |
958 | ||
f19624aa | 959 | static void iser_handle_comp_error(struct iser_tx_desc *desc, |
bcc60c38 | 960 | struct iser_conn *ib_conn) |
1cfa0a75 | 961 | { |
78ad0a34 OG |
962 | if (desc && desc->type == ISCSI_TX_DATAOUT) |
963 | kmem_cache_free(ig.desc_cache, desc); | |
1cfa0a75 | 964 | |
704315f0 | 965 | if (ib_conn->post_recv_buf_count == 0 && |
1d426d64 EZ |
966 | atomic_read(&ib_conn->post_send_buf_count) == 0) { |
967 | /* getting here when the state is UP means that the conn is * | |
968 | * being terminated asynchronously from the iSCSI layer's * | |
969 | * perspective. */ | |
970 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
971 | ISER_CONN_TERMINATING)) | |
972 | iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, | |
973 | ISCSI_ERR_CONN_FAILED); | |
974 | ||
39ff05db OG |
975 | /* no more non completed posts to the QP, complete the |
976 | * termination process w.o worrying on disconnect event */ | |
977 | ib_conn->state = ISER_CONN_DOWN; | |
978 | wake_up_interruptible(&ib_conn->wait); | |
1d426d64 | 979 | } |
1cfa0a75 OG |
980 | } |
981 | ||
5a33a669 | 982 | static int iser_drain_tx_cq(struct iser_device *device, int cq_index) |
78ad0a34 | 983 | { |
5a33a669 | 984 | struct ib_cq *cq = device->tx_cq[cq_index]; |
78ad0a34 | 985 | struct ib_wc wc; |
f19624aa | 986 | struct iser_tx_desc *tx_desc; |
78ad0a34 OG |
987 | struct iser_conn *ib_conn; |
988 | int completed_tx = 0; | |
989 | ||
990 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
f19624aa | 991 | tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; |
78ad0a34 OG |
992 | ib_conn = wc.qp->qp_context; |
993 | if (wc.status == IB_WC_SUCCESS) { | |
994 | if (wc.opcode == IB_WC_SEND) | |
f19624aa | 995 | iser_snd_completion(tx_desc, ib_conn); |
5587856c SG |
996 | else if (wc.opcode == IB_WC_LOCAL_INV || |
997 | wc.opcode == IB_WC_FAST_REG_MR) { | |
998 | atomic_dec(&ib_conn->post_send_buf_count); | |
999 | continue; | |
1000 | } else | |
78ad0a34 OG |
1001 | iser_err("expected opcode %d got %d\n", |
1002 | IB_WC_SEND, wc.opcode); | |
1003 | } else { | |
1004 | iser_err("tx id %llx status %d vend_err %x\n", | |
1005 | wc.wr_id, wc.status, wc.vendor_err); | |
1006 | atomic_dec(&ib_conn->post_send_buf_count); | |
1007 | iser_handle_comp_error(tx_desc, ib_conn); | |
1008 | } | |
1009 | completed_tx++; | |
1010 | } | |
1011 | return completed_tx; | |
1012 | } | |
1013 | ||
1014 | ||
1cfa0a75 OG |
1015 | static void iser_cq_tasklet_fn(unsigned long data) |
1016 | { | |
5a33a669 AT |
1017 | struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data; |
1018 | struct iser_device *device = cq_desc->device; | |
1019 | int cq_index = cq_desc->cq_index; | |
1020 | struct ib_cq *cq = device->rx_cq[cq_index]; | |
1cfa0a75 | 1021 | struct ib_wc wc; |
78ad0a34 | 1022 | struct iser_rx_desc *desc; |
1cfa0a75 | 1023 | unsigned long xfer_len; |
bcc60c38 | 1024 | struct iser_conn *ib_conn; |
78ad0a34 OG |
1025 | int completed_tx, completed_rx; |
1026 | completed_tx = completed_rx = 0; | |
1cfa0a75 OG |
1027 | |
1028 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
78ad0a34 | 1029 | desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; |
1cfa0a75 | 1030 | BUG_ON(desc == NULL); |
bcc60c38 | 1031 | ib_conn = wc.qp->qp_context; |
1cfa0a75 | 1032 | if (wc.status == IB_WC_SUCCESS) { |
bcc60c38 | 1033 | if (wc.opcode == IB_WC_RECV) { |
1cfa0a75 | 1034 | xfer_len = (unsigned long)wc.byte_len; |
78ad0a34 OG |
1035 | iser_rcv_completion(desc, xfer_len, ib_conn); |
1036 | } else | |
1037 | iser_err("expected opcode %d got %d\n", | |
1038 | IB_WC_RECV, wc.opcode); | |
1cfa0a75 | 1039 | } else { |
bcc60c38 | 1040 | if (wc.status != IB_WC_WR_FLUSH_ERR) |
78ad0a34 | 1041 | iser_err("rx id %llx status %d vend_err %x\n", |
bcc60c38 | 1042 | wc.wr_id, wc.status, wc.vendor_err); |
78ad0a34 OG |
1043 | ib_conn->post_recv_buf_count--; |
1044 | iser_handle_comp_error(NULL, ib_conn); | |
1cfa0a75 | 1045 | } |
78ad0a34 OG |
1046 | completed_rx++; |
1047 | if (!(completed_rx & 63)) | |
5a33a669 | 1048 | completed_tx += iser_drain_tx_cq(device, cq_index); |
1cfa0a75 OG |
1049 | } |
1050 | /* #warning "it is assumed here that arming CQ only once its empty" * | |
1051 | * " would not cause interrupts to be missed" */ | |
1052 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
78ad0a34 | 1053 | |
5a33a669 | 1054 | completed_tx += iser_drain_tx_cq(device, cq_index); |
78ad0a34 | 1055 | iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); |
1cfa0a75 OG |
1056 | } |
1057 | ||
1058 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
1059 | { | |
5a33a669 AT |
1060 | struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context; |
1061 | struct iser_device *device = cq_desc->device; | |
1062 | int cq_index = cq_desc->cq_index; | |
1cfa0a75 | 1063 | |
5a33a669 | 1064 | tasklet_schedule(&device->cq_tasklet[cq_index]); |
1cfa0a75 | 1065 | } |