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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. | |
3ee07d27 | 4 | * Copyright (c) 2013-2014 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 | 74 | struct iser_cq_desc *cq_desc; |
65198d6b SG |
75 | struct ib_device_attr *dev_attr = &device->dev_attr; |
76 | int ret, i, j; | |
5a33a669 | 77 | |
65198d6b SG |
78 | ret = ib_query_device(device->ib_device, dev_attr); |
79 | if (ret) { | |
5587856c | 80 | pr_warn("Query device failed for %s\n", device->ib_device->name); |
65198d6b | 81 | return ret; |
5587856c SG |
82 | } |
83 | ||
84 | /* Assign function handles - based on FMR support */ | |
85 | if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr && | |
86 | device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) { | |
87 | iser_info("FMR supported, using FMR for registration\n"); | |
88 | device->iser_alloc_rdma_reg_res = iser_create_fmr_pool; | |
89 | device->iser_free_rdma_reg_res = iser_free_fmr_pool; | |
90 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr; | |
91 | device->iser_unreg_rdma_mem = iser_unreg_mem_fmr; | |
92 | } else | |
93 | if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { | |
7306b8fa SG |
94 | iser_info("FastReg supported, using FastReg for registration\n"); |
95 | device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool; | |
96 | device->iser_free_rdma_reg_res = iser_free_fastreg_pool; | |
97 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg; | |
98 | device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg; | |
5587856c | 99 | } else { |
7306b8fa | 100 | iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n"); |
65198d6b | 101 | return -1; |
5587856c | 102 | } |
b4e155ff | 103 | |
5a33a669 | 104 | device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors); |
4f363882 RD |
105 | iser_info("using %d CQs, device %s supports %d vectors\n", |
106 | device->cqs_used, device->ib_device->name, | |
107 | device->ib_device->num_comp_vectors); | |
5a33a669 AT |
108 | |
109 | device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used, | |
110 | GFP_KERNEL); | |
111 | if (device->cq_desc == NULL) | |
112 | goto cq_desc_err; | |
113 | cq_desc = device->cq_desc; | |
114 | ||
1cfa0a75 OG |
115 | device->pd = ib_alloc_pd(device->ib_device); |
116 | if (IS_ERR(device->pd)) | |
117 | goto pd_err; | |
118 | ||
5a33a669 AT |
119 | for (i = 0; i < device->cqs_used; i++) { |
120 | cq_desc[i].device = device; | |
121 | cq_desc[i].cq_index = i; | |
122 | ||
123 | device->rx_cq[i] = ib_create_cq(device->ib_device, | |
124 | iser_cq_callback, | |
125 | iser_cq_event_callback, | |
126 | (void *)&cq_desc[i], | |
127 | ISER_MAX_RX_CQ_LEN, i); | |
128 | if (IS_ERR(device->rx_cq[i])) | |
129 | goto cq_err; | |
1cfa0a75 | 130 | |
5a33a669 AT |
131 | device->tx_cq[i] = ib_create_cq(device->ib_device, |
132 | NULL, iser_cq_event_callback, | |
133 | (void *)&cq_desc[i], | |
134 | ISER_MAX_TX_CQ_LEN, i); | |
78ad0a34 | 135 | |
5a33a669 AT |
136 | if (IS_ERR(device->tx_cq[i])) |
137 | goto cq_err; | |
78ad0a34 | 138 | |
5a33a669 AT |
139 | if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP)) |
140 | goto cq_err; | |
1cfa0a75 | 141 | |
5a33a669 AT |
142 | tasklet_init(&device->cq_tasklet[i], |
143 | iser_cq_tasklet_fn, | |
144 | (unsigned long)&cq_desc[i]); | |
145 | } | |
1cfa0a75 | 146 | |
d8111028 EZ |
147 | device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
148 | IB_ACCESS_REMOTE_WRITE | | |
149 | IB_ACCESS_REMOTE_READ); | |
1cfa0a75 OG |
150 | if (IS_ERR(device->mr)) |
151 | goto dma_mr_err; | |
152 | ||
2110f9bf OG |
153 | INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, |
154 | iser_event_handler); | |
155 | if (ib_register_event_handler(&device->event_handler)) | |
156 | goto handler_err; | |
157 | ||
1cfa0a75 OG |
158 | return 0; |
159 | ||
2110f9bf OG |
160 | handler_err: |
161 | ib_dereg_mr(device->mr); | |
1cfa0a75 | 162 | dma_mr_err: |
5a33a669 AT |
163 | for (j = 0; j < device->cqs_used; j++) |
164 | tasklet_kill(&device->cq_tasklet[j]); | |
165 | cq_err: | |
166 | for (j = 0; j < i; j++) { | |
167 | if (device->tx_cq[j]) | |
168 | ib_destroy_cq(device->tx_cq[j]); | |
169 | if (device->rx_cq[j]) | |
170 | ib_destroy_cq(device->rx_cq[j]); | |
171 | } | |
1cfa0a75 OG |
172 | ib_dealloc_pd(device->pd); |
173 | pd_err: | |
5a33a669 AT |
174 | kfree(device->cq_desc); |
175 | cq_desc_err: | |
1cfa0a75 OG |
176 | iser_err("failed to allocate an IB resource\n"); |
177 | return -1; | |
178 | } | |
179 | ||
180 | /** | |
38dc732f | 181 | * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
1cfa0a75 OG |
182 | * CQ and PD created with the device associated with the adapator. |
183 | */ | |
184 | static void iser_free_device_ib_res(struct iser_device *device) | |
185 | { | |
5a33a669 | 186 | int i; |
1cfa0a75 OG |
187 | BUG_ON(device->mr == NULL); |
188 | ||
5a33a669 AT |
189 | for (i = 0; i < device->cqs_used; i++) { |
190 | tasklet_kill(&device->cq_tasklet[i]); | |
191 | (void)ib_destroy_cq(device->tx_cq[i]); | |
192 | (void)ib_destroy_cq(device->rx_cq[i]); | |
193 | device->tx_cq[i] = NULL; | |
194 | device->rx_cq[i] = NULL; | |
195 | } | |
196 | ||
2110f9bf | 197 | (void)ib_unregister_event_handler(&device->event_handler); |
1cfa0a75 | 198 | (void)ib_dereg_mr(device->mr); |
1cfa0a75 OG |
199 | (void)ib_dealloc_pd(device->pd); |
200 | ||
5a33a669 AT |
201 | kfree(device->cq_desc); |
202 | ||
1cfa0a75 | 203 | device->mr = NULL; |
1cfa0a75 OG |
204 | device->pd = NULL; |
205 | } | |
206 | ||
207 | /** | |
986db0d6 | 208 | * iser_create_fmr_pool - Creates FMR pool and page_vector |
1cfa0a75 | 209 | * |
986db0d6 | 210 | * returns 0 on success, or errno code on failure |
1cfa0a75 | 211 | */ |
b7f04513 | 212 | int iser_create_fmr_pool(struct iser_conn *ib_conn, unsigned cmds_max) |
1cfa0a75 | 213 | { |
986db0d6 | 214 | struct iser_device *device = ib_conn->device; |
1cfa0a75 | 215 | struct ib_fmr_pool_param params; |
986db0d6 | 216 | int ret = -ENOMEM; |
bcc60c38 | 217 | |
7306b8fa SG |
218 | ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) + |
219 | (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)), | |
220 | GFP_KERNEL); | |
221 | if (!ib_conn->fmr.page_vec) | |
986db0d6 | 222 | return ret; |
9fda1ac5 | 223 | |
7306b8fa | 224 | ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->fmr.page_vec + 1); |
1cfa0a75 | 225 | |
8dfa0876 | 226 | params.page_shift = SHIFT_4K; |
1cfa0a75 OG |
227 | /* when the first/last SG element are not start/end * |
228 | * page aligned, the map whould be of N+1 pages */ | |
229 | params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; | |
230 | /* make the pool size twice the max number of SCSI commands * | |
231 | * the ML is expected to queue, watermark for unmap at 50% */ | |
b7f04513 SP |
232 | params.pool_size = cmds_max * 2; |
233 | params.dirty_watermark = cmds_max; | |
1cfa0a75 OG |
234 | params.cache = 0; |
235 | params.flush_function = NULL; | |
236 | params.access = (IB_ACCESS_LOCAL_WRITE | | |
237 | IB_ACCESS_REMOTE_WRITE | | |
238 | IB_ACCESS_REMOTE_READ); | |
239 | ||
7306b8fa SG |
240 | ib_conn->fmr.pool = ib_create_fmr_pool(device->pd, ¶ms); |
241 | if (!IS_ERR(ib_conn->fmr.pool)) | |
986db0d6 SP |
242 | return 0; |
243 | ||
244 | /* no FMR => no need for page_vec */ | |
7306b8fa SG |
245 | kfree(ib_conn->fmr.page_vec); |
246 | ib_conn->fmr.page_vec = NULL; | |
986db0d6 | 247 | |
7306b8fa SG |
248 | ret = PTR_ERR(ib_conn->fmr.pool); |
249 | ib_conn->fmr.pool = NULL; | |
986db0d6 SP |
250 | if (ret != -ENOSYS) { |
251 | iser_err("FMR allocation failed, err %d\n", ret); | |
252 | return ret; | |
253 | } else { | |
5525d210 | 254 | iser_warn("FMRs are not supported, using unaligned mode\n"); |
986db0d6 | 255 | return 0; |
1cfa0a75 | 256 | } |
986db0d6 SP |
257 | } |
258 | ||
259 | /** | |
260 | * iser_free_fmr_pool - releases the FMR pool and page vec | |
261 | */ | |
262 | void iser_free_fmr_pool(struct iser_conn *ib_conn) | |
263 | { | |
264 | iser_info("freeing conn %p fmr pool %p\n", | |
7306b8fa | 265 | ib_conn, ib_conn->fmr.pool); |
986db0d6 | 266 | |
7306b8fa SG |
267 | if (ib_conn->fmr.pool != NULL) |
268 | ib_destroy_fmr_pool(ib_conn->fmr.pool); | |
986db0d6 | 269 | |
7306b8fa | 270 | ib_conn->fmr.pool = NULL; |
986db0d6 | 271 | |
7306b8fa SG |
272 | kfree(ib_conn->fmr.page_vec); |
273 | ib_conn->fmr.page_vec = NULL; | |
986db0d6 SP |
274 | } |
275 | ||
310b347c SG |
276 | static int |
277 | iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd, | |
6b5a8fb0 | 278 | bool pi_enable, struct fast_reg_descriptor *desc) |
310b347c SG |
279 | { |
280 | int ret; | |
281 | ||
282 | desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, | |
283 | ISCSI_ISER_SG_TABLESIZE + 1); | |
284 | if (IS_ERR(desc->data_frpl)) { | |
285 | ret = PTR_ERR(desc->data_frpl); | |
286 | iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n", | |
287 | ret); | |
288 | return PTR_ERR(desc->data_frpl); | |
289 | } | |
290 | ||
291 | desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1); | |
292 | if (IS_ERR(desc->data_mr)) { | |
293 | ret = PTR_ERR(desc->data_mr); | |
294 | iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); | |
295 | goto fast_reg_mr_failure; | |
296 | } | |
6b5a8fb0 AT |
297 | desc->reg_indicators |= ISER_DATA_KEY_VALID; |
298 | ||
299 | if (pi_enable) { | |
300 | struct ib_mr_init_attr mr_init_attr = {0}; | |
301 | struct iser_pi_context *pi_ctx = NULL; | |
302 | ||
303 | desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); | |
304 | if (!desc->pi_ctx) { | |
305 | iser_err("Failed to allocate pi context\n"); | |
306 | ret = -ENOMEM; | |
307 | goto pi_ctx_alloc_failure; | |
308 | } | |
309 | pi_ctx = desc->pi_ctx; | |
310 | ||
311 | pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device, | |
312 | ISCSI_ISER_SG_TABLESIZE); | |
313 | if (IS_ERR(pi_ctx->prot_frpl)) { | |
314 | ret = PTR_ERR(pi_ctx->prot_frpl); | |
315 | iser_err("Failed to allocate prot frpl ret=%d\n", | |
316 | ret); | |
317 | goto prot_frpl_failure; | |
318 | } | |
319 | ||
320 | pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, | |
321 | ISCSI_ISER_SG_TABLESIZE + 1); | |
322 | if (IS_ERR(pi_ctx->prot_mr)) { | |
323 | ret = PTR_ERR(pi_ctx->prot_mr); | |
324 | iser_err("Failed to allocate prot frmr ret=%d\n", | |
325 | ret); | |
326 | goto prot_mr_failure; | |
327 | } | |
328 | desc->reg_indicators |= ISER_PROT_KEY_VALID; | |
329 | ||
330 | mr_init_attr.max_reg_descriptors = 2; | |
331 | mr_init_attr.flags |= IB_MR_SIGNATURE_EN; | |
332 | pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr); | |
333 | if (IS_ERR(pi_ctx->sig_mr)) { | |
334 | ret = PTR_ERR(pi_ctx->sig_mr); | |
335 | iser_err("Failed to allocate signature enabled mr err=%d\n", | |
336 | ret); | |
337 | goto sig_mr_failure; | |
338 | } | |
339 | desc->reg_indicators |= ISER_SIG_KEY_VALID; | |
340 | } | |
341 | desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; | |
342 | ||
4f9208ad OG |
343 | iser_dbg("Create fr_desc %p page_list %p\n", |
344 | desc, desc->data_frpl->page_list); | |
310b347c SG |
345 | |
346 | return 0; | |
6b5a8fb0 AT |
347 | sig_mr_failure: |
348 | ib_dereg_mr(desc->pi_ctx->prot_mr); | |
349 | prot_mr_failure: | |
350 | ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl); | |
351 | prot_frpl_failure: | |
352 | kfree(desc->pi_ctx); | |
353 | pi_ctx_alloc_failure: | |
354 | ib_dereg_mr(desc->data_mr); | |
310b347c SG |
355 | fast_reg_mr_failure: |
356 | ib_free_fast_reg_page_list(desc->data_frpl); | |
357 | ||
358 | return ret; | |
359 | } | |
360 | ||
5587856c | 361 | /** |
7306b8fa | 362 | * iser_create_fastreg_pool - Creates pool of fast_reg descriptors |
5587856c SG |
363 | * for fast registration work requests. |
364 | * returns 0 on success, or errno code on failure | |
365 | */ | |
7306b8fa | 366 | int iser_create_fastreg_pool(struct iser_conn *ib_conn, unsigned cmds_max) |
5587856c SG |
367 | { |
368 | struct iser_device *device = ib_conn->device; | |
369 | struct fast_reg_descriptor *desc; | |
370 | int i, ret; | |
371 | ||
7306b8fa SG |
372 | INIT_LIST_HEAD(&ib_conn->fastreg.pool); |
373 | ib_conn->fastreg.pool_size = 0; | |
5587856c | 374 | for (i = 0; i < cmds_max; i++) { |
6b5a8fb0 | 375 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
5587856c SG |
376 | if (!desc) { |
377 | iser_err("Failed to allocate a new fast_reg descriptor\n"); | |
378 | ret = -ENOMEM; | |
379 | goto err; | |
380 | } | |
381 | ||
6b5a8fb0 AT |
382 | ret = iser_create_fastreg_desc(device->ib_device, device->pd, |
383 | ib_conn->pi_support, desc); | |
310b347c SG |
384 | if (ret) { |
385 | iser_err("Failed to create fastreg descriptor err=%d\n", | |
386 | ret); | |
387 | kfree(desc); | |
388 | goto err; | |
5587856c SG |
389 | } |
390 | ||
7306b8fa SG |
391 | list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
392 | ib_conn->fastreg.pool_size++; | |
5587856c SG |
393 | } |
394 | ||
395 | return 0; | |
27ae2d1e | 396 | |
5587856c | 397 | err: |
7306b8fa | 398 | iser_free_fastreg_pool(ib_conn); |
5587856c SG |
399 | return ret; |
400 | } | |
401 | ||
402 | /** | |
7306b8fa | 403 | * iser_free_fastreg_pool - releases the pool of fast_reg descriptors |
5587856c | 404 | */ |
7306b8fa | 405 | void iser_free_fastreg_pool(struct iser_conn *ib_conn) |
5587856c SG |
406 | { |
407 | struct fast_reg_descriptor *desc, *tmp; | |
408 | int i = 0; | |
409 | ||
7306b8fa | 410 | if (list_empty(&ib_conn->fastreg.pool)) |
5587856c SG |
411 | return; |
412 | ||
7306b8fa | 413 | iser_info("freeing conn %p fr pool\n", ib_conn); |
5587856c | 414 | |
7306b8fa | 415 | list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) { |
5587856c SG |
416 | list_del(&desc->list); |
417 | ib_free_fast_reg_page_list(desc->data_frpl); | |
418 | ib_dereg_mr(desc->data_mr); | |
6b5a8fb0 AT |
419 | if (desc->pi_ctx) { |
420 | ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl); | |
421 | ib_dereg_mr(desc->pi_ctx->prot_mr); | |
422 | ib_destroy_mr(desc->pi_ctx->sig_mr); | |
423 | kfree(desc->pi_ctx); | |
424 | } | |
5587856c SG |
425 | kfree(desc); |
426 | ++i; | |
427 | } | |
428 | ||
7306b8fa | 429 | if (i < ib_conn->fastreg.pool_size) |
5587856c | 430 | iser_warn("pool still has %d regions registered\n", |
7306b8fa | 431 | ib_conn->fastreg.pool_size - i); |
5587856c SG |
432 | } |
433 | ||
986db0d6 SP |
434 | /** |
435 | * iser_create_ib_conn_res - Queue-Pair (QP) | |
436 | * | |
437 | * returns 0 on success, -1 on failure | |
438 | */ | |
439 | static int iser_create_ib_conn_res(struct iser_conn *ib_conn) | |
440 | { | |
441 | struct iser_device *device; | |
442 | struct ib_qp_init_attr init_attr; | |
443 | int ret = -ENOMEM; | |
444 | int index, min_index = 0; | |
445 | ||
446 | BUG_ON(ib_conn->device == NULL); | |
447 | ||
448 | device = ib_conn->device; | |
1cfa0a75 OG |
449 | |
450 | memset(&init_attr, 0, sizeof init_attr); | |
451 | ||
5a33a669 AT |
452 | mutex_lock(&ig.connlist_mutex); |
453 | /* select the CQ with the minimal number of usages */ | |
454 | for (index = 0; index < device->cqs_used; index++) | |
455 | if (device->cq_active_qps[index] < | |
456 | device->cq_active_qps[min_index]) | |
457 | min_index = index; | |
458 | device->cq_active_qps[min_index]++; | |
459 | mutex_unlock(&ig.connlist_mutex); | |
4f363882 | 460 | iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); |
5a33a669 | 461 | |
1cfa0a75 OG |
462 | init_attr.event_handler = iser_qp_event_callback; |
463 | init_attr.qp_context = (void *)ib_conn; | |
5a33a669 AT |
464 | init_attr.send_cq = device->tx_cq[min_index]; |
465 | init_attr.recv_cq = device->rx_cq[min_index]; | |
1cfa0a75 | 466 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; |
f19624aa | 467 | init_attr.cap.max_send_sge = 2; |
bcc60c38 | 468 | init_attr.cap.max_recv_sge = 1; |
1cfa0a75 OG |
469 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
470 | init_attr.qp_type = IB_QPT_RC; | |
6b5a8fb0 AT |
471 | if (ib_conn->pi_support) { |
472 | init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS; | |
473 | init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; | |
474 | } else { | |
475 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; | |
476 | } | |
1cfa0a75 OG |
477 | |
478 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); | |
479 | if (ret) | |
9fda1ac5 | 480 | goto out_err; |
1cfa0a75 OG |
481 | |
482 | ib_conn->qp = ib_conn->cma_id->qp; | |
986db0d6 | 483 | iser_info("setting conn %p cma_id %p qp %p\n", |
4f363882 | 484 | ib_conn, ib_conn->cma_id, |
986db0d6 | 485 | ib_conn->cma_id->qp); |
1cfa0a75 OG |
486 | return ret; |
487 | ||
9fda1ac5 | 488 | out_err: |
1cfa0a75 OG |
489 | iser_err("unable to alloc mem or create resource, err %d\n", ret); |
490 | return ret; | |
491 | } | |
492 | ||
493 | /** | |
f1a8bf09 | 494 | * releases the QP object |
1cfa0a75 | 495 | */ |
f1a8bf09 | 496 | static void iser_free_ib_conn_res(struct iser_conn *ib_conn) |
1cfa0a75 | 497 | { |
5a33a669 | 498 | int cq_index; |
1cfa0a75 OG |
499 | BUG_ON(ib_conn == NULL); |
500 | ||
986db0d6 | 501 | iser_info("freeing conn %p cma_id %p qp %p\n", |
4f363882 | 502 | ib_conn, ib_conn->cma_id, |
986db0d6 | 503 | ib_conn->qp); |
1cfa0a75 OG |
504 | |
505 | /* qp is created only once both addr & route are resolved */ | |
1cfa0a75 | 506 | |
5a33a669 AT |
507 | if (ib_conn->qp != NULL) { |
508 | cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index; | |
509 | ib_conn->device->cq_active_qps[cq_index]--; | |
1cfa0a75 | 510 | |
5a33a669 AT |
511 | rdma_destroy_qp(ib_conn->cma_id); |
512 | } | |
1cfa0a75 | 513 | |
1cfa0a75 | 514 | ib_conn->qp = NULL; |
1cfa0a75 OG |
515 | } |
516 | ||
517 | /** | |
518 | * based on the resolved device node GUID see if there already allocated | |
519 | * device for this device. If there's no such, create one. | |
520 | */ | |
521 | static | |
522 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
523 | { | |
9a378270 | 524 | struct iser_device *device; |
1cfa0a75 OG |
525 | |
526 | mutex_lock(&ig.device_list_mutex); | |
527 | ||
9a378270 | 528 | list_for_each_entry(device, &ig.device_list, ig_list) |
1cfa0a75 OG |
529 | /* find if there's a match using the node GUID */ |
530 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
d33ed425 | 531 | goto inc_refcnt; |
9a378270 AR |
532 | |
533 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
534 | if (device == NULL) | |
535 | goto out; | |
536 | ||
537 | /* assign this device to the device */ | |
538 | device->ib_device = cma_id->device; | |
539 | /* init the device and link it into ig device list */ | |
540 | if (iser_create_device_ib_res(device)) { | |
541 | kfree(device); | |
542 | device = NULL; | |
543 | goto out; | |
1cfa0a75 | 544 | } |
9a378270 AR |
545 | list_add(&device->ig_list, &ig.device_list); |
546 | ||
d33ed425 | 547 | inc_refcnt: |
1cfa0a75 | 548 | device->refcount++; |
d33ed425 | 549 | out: |
1cfa0a75 OG |
550 | mutex_unlock(&ig.device_list_mutex); |
551 | return device; | |
552 | } | |
553 | ||
554 | /* if there's no demand for this device, release it */ | |
555 | static void iser_device_try_release(struct iser_device *device) | |
556 | { | |
557 | mutex_lock(&ig.device_list_mutex); | |
558 | device->refcount--; | |
4f363882 | 559 | iser_info("device %p refcount %d\n", device, device->refcount); |
1cfa0a75 OG |
560 | if (!device->refcount) { |
561 | iser_free_device_ib_res(device); | |
562 | list_del(&device->ig_list); | |
563 | kfree(device); | |
564 | } | |
565 | mutex_unlock(&ig.device_list_mutex); | |
566 | } | |
567 | ||
504130c0 AN |
568 | /** |
569 | * Called with state mutex held | |
570 | **/ | |
1cfa0a75 OG |
571 | static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, |
572 | enum iser_ib_conn_state comp, | |
573 | enum iser_ib_conn_state exch) | |
574 | { | |
575 | int ret; | |
576 | ||
1cfa0a75 OG |
577 | if ((ret = (ib_conn->state == comp))) |
578 | ib_conn->state = exch; | |
1cfa0a75 OG |
579 | return ret; |
580 | } | |
581 | ||
b73c3ada AN |
582 | void iser_release_work(struct work_struct *work) |
583 | { | |
584 | struct iser_conn *ib_conn; | |
9a6d3234 | 585 | int rc; |
b73c3ada AN |
586 | |
587 | ib_conn = container_of(work, struct iser_conn, release_work); | |
588 | ||
589 | /* wait for .conn_stop callback */ | |
9a6d3234 AN |
590 | rc = wait_for_completion_timeout(&ib_conn->stop_completion, 30 * HZ); |
591 | WARN_ON(rc == 0); | |
b73c3ada AN |
592 | |
593 | /* wait for the qp`s post send and post receive buffers to empty */ | |
9a6d3234 AN |
594 | rc = wait_for_completion_timeout(&ib_conn->flush_completion, 30 * HZ); |
595 | WARN_ON(rc == 0); | |
596 | ||
597 | ib_conn->state = ISER_CONN_DOWN; | |
b73c3ada | 598 | |
504130c0 AN |
599 | mutex_lock(&ib_conn->state_mutex); |
600 | ib_conn->state = ISER_CONN_DOWN; | |
601 | mutex_unlock(&ib_conn->state_mutex); | |
602 | ||
b73c3ada AN |
603 | iser_conn_release(ib_conn); |
604 | } | |
605 | ||
41179e2d RD |
606 | /** |
607 | * Frees all conn objects and deallocs conn descriptor | |
608 | */ | |
b73c3ada | 609 | void iser_conn_release(struct iser_conn *ib_conn) |
41179e2d RD |
610 | { |
611 | struct iser_device *device = ib_conn->device; | |
612 | ||
41179e2d RD |
613 | mutex_lock(&ig.connlist_mutex); |
614 | list_del(&ib_conn->conn_list); | |
615 | mutex_unlock(&ig.connlist_mutex); | |
504130c0 AN |
616 | |
617 | mutex_lock(&ib_conn->state_mutex); | |
618 | BUG_ON(ib_conn->state != ISER_CONN_DOWN); | |
619 | ||
bcc60c38 | 620 | iser_free_rx_descriptors(ib_conn); |
5b61ff43 | 621 | iser_free_ib_conn_res(ib_conn); |
41179e2d RD |
622 | ib_conn->device = NULL; |
623 | /* on EVENT_ADDR_ERROR there's no device yet for this conn */ | |
624 | if (device != NULL) | |
625 | iser_device_try_release(device); | |
504130c0 AN |
626 | mutex_unlock(&ib_conn->state_mutex); |
627 | ||
5b61ff43 | 628 | /* if cma handler context, the caller actually destroy the id */ |
b73c3ada | 629 | if (ib_conn->cma_id != NULL) { |
5b61ff43 RD |
630 | rdma_destroy_id(ib_conn->cma_id); |
631 | ib_conn->cma_id = NULL; | |
632 | } | |
0a690758 | 633 | kfree(ib_conn); |
41179e2d RD |
634 | } |
635 | ||
1cfa0a75 OG |
636 | /** |
637 | * triggers start of the disconnect procedures and wait for them to be done | |
638 | */ | |
639 | void iser_conn_terminate(struct iser_conn *ib_conn) | |
640 | { | |
641 | int err = 0; | |
642 | ||
643 | /* change the ib conn state only if the conn is UP, however always call | |
644 | * rdma_disconnect since this is the only way to cause the CMA to change | |
645 | * the QP state to ERROR | |
646 | */ | |
647 | ||
648 | iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); | |
649 | err = rdma_disconnect(ib_conn->cma_id); | |
650 | if (err) | |
651 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
652 | ib_conn,err); | |
1cfa0a75 OG |
653 | } |
654 | ||
504130c0 AN |
655 | /** |
656 | * Called with state mutex held | |
657 | **/ | |
b73c3ada | 658 | static void iser_connect_error(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
659 | { |
660 | struct iser_conn *ib_conn; | |
b73c3ada | 661 | |
1cfa0a75 | 662 | ib_conn = (struct iser_conn *)cma_id->context; |
1cfa0a75 | 663 | ib_conn->state = ISER_CONN_DOWN; |
1cfa0a75 OG |
664 | } |
665 | ||
504130c0 AN |
666 | /** |
667 | * Called with state mutex held | |
668 | **/ | |
b73c3ada | 669 | static void iser_addr_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
670 | { |
671 | struct iser_device *device; | |
672 | struct iser_conn *ib_conn; | |
673 | int ret; | |
674 | ||
504130c0 AN |
675 | ib_conn = (struct iser_conn *)cma_id->context; |
676 | if (ib_conn->state != ISER_CONN_PENDING) | |
677 | /* bailout */ | |
678 | return; | |
679 | ||
1cfa0a75 | 680 | device = iser_device_find_by_ib_device(cma_id); |
d33ed425 AR |
681 | if (!device) { |
682 | iser_err("device lookup/creation failed\n"); | |
b73c3ada AN |
683 | iser_connect_error(cma_id); |
684 | return; | |
d33ed425 AR |
685 | } |
686 | ||
1cfa0a75 OG |
687 | ib_conn->device = device; |
688 | ||
7f733847 AT |
689 | /* connection T10-PI support */ |
690 | if (iser_pi_enable) { | |
691 | if (!(device->dev_attr.device_cap_flags & | |
692 | IB_DEVICE_SIGNATURE_HANDOVER)) { | |
693 | iser_warn("T10-PI requested but not supported on %s, " | |
694 | "continue without T10-PI\n", | |
695 | ib_conn->device->ib_device->name); | |
696 | ib_conn->pi_support = false; | |
697 | } else { | |
698 | ib_conn->pi_support = true; | |
699 | } | |
700 | } | |
701 | ||
1cfa0a75 OG |
702 | ret = rdma_resolve_route(cma_id, 1000); |
703 | if (ret) { | |
704 | iser_err("resolve route failed: %d\n", ret); | |
b73c3ada AN |
705 | iser_connect_error(cma_id); |
706 | return; | |
1cfa0a75 | 707 | } |
1cfa0a75 OG |
708 | } |
709 | ||
504130c0 AN |
710 | /** |
711 | * Called with state mutex held | |
712 | **/ | |
b73c3ada | 713 | static void iser_route_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
714 | { |
715 | struct rdma_conn_param conn_param; | |
716 | int ret; | |
8d8399de | 717 | struct iser_cm_hdr req_hdr; |
2ea32938 SG |
718 | struct iser_conn *ib_conn = (struct iser_conn *)cma_id->context; |
719 | struct iser_device *device = ib_conn->device; | |
1cfa0a75 | 720 | |
504130c0 AN |
721 | if (ib_conn->state != ISER_CONN_PENDING) |
722 | /* bailout */ | |
723 | return; | |
724 | ||
1cfa0a75 OG |
725 | ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); |
726 | if (ret) | |
727 | goto failure; | |
728 | ||
1cfa0a75 | 729 | memset(&conn_param, 0, sizeof conn_param); |
2ea32938 | 730 | conn_param.responder_resources = device->dev_attr.max_qp_rd_atom; |
1cfa0a75 OG |
731 | conn_param.initiator_depth = 1; |
732 | conn_param.retry_count = 7; | |
733 | conn_param.rnr_retry_count = 6; | |
734 | ||
8d8399de OG |
735 | memset(&req_hdr, 0, sizeof(req_hdr)); |
736 | req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED | | |
737 | ISER_SEND_W_INV_NOT_SUPPORTED); | |
738 | conn_param.private_data = (void *)&req_hdr; | |
739 | conn_param.private_data_len = sizeof(struct iser_cm_hdr); | |
740 | ||
1cfa0a75 OG |
741 | ret = rdma_connect(cma_id, &conn_param); |
742 | if (ret) { | |
743 | iser_err("failure connecting: %d\n", ret); | |
744 | goto failure; | |
745 | } | |
746 | ||
b73c3ada | 747 | return; |
1cfa0a75 | 748 | failure: |
b73c3ada | 749 | iser_connect_error(cma_id); |
1cfa0a75 OG |
750 | } |
751 | ||
752 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
753 | { | |
754 | struct iser_conn *ib_conn; | |
4f9208ad OG |
755 | struct ib_qp_attr attr; |
756 | struct ib_qp_init_attr init_attr; | |
757 | ||
504130c0 AN |
758 | ib_conn = (struct iser_conn *)cma_id->context; |
759 | if (ib_conn->state != ISER_CONN_PENDING) | |
760 | /* bailout */ | |
761 | return; | |
762 | ||
4f9208ad OG |
763 | (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); |
764 | iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); | |
1cfa0a75 | 765 | |
9a6d3234 AN |
766 | ib_conn->state = ISER_CONN_UP; |
767 | complete(&ib_conn->up_completion); | |
1cfa0a75 OG |
768 | } |
769 | ||
b73c3ada | 770 | static void iser_disconnected_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
771 | { |
772 | struct iser_conn *ib_conn; | |
773 | ||
774 | ib_conn = (struct iser_conn *)cma_id->context; | |
1cfa0a75 OG |
775 | |
776 | /* getting here when the state is UP means that the conn is being * | |
777 | * terminated asynchronously from the iSCSI layer's perspective. */ | |
778 | if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, | |
7d9eacf9 | 779 | ISER_CONN_TERMINATING)){ |
4667f5df AN |
780 | if (ib_conn->iscsi_conn) |
781 | iscsi_conn_failure(ib_conn->iscsi_conn, ISCSI_ERR_CONN_FAILED); | |
7d9eacf9 RD |
782 | else |
783 | iser_err("iscsi_iser connection isn't bound\n"); | |
784 | } | |
1cfa0a75 | 785 | |
8d4aca7f RD |
786 | /* Complete the termination process if no posts are pending. This code |
787 | * block also exists in iser_handle_comp_error(), but it is needed here | |
788 | * for cases of no flushes at all, e.g. discovery over rdma. | |
789 | */ | |
704315f0 | 790 | if (ib_conn->post_recv_buf_count == 0 && |
1cfa0a75 | 791 | (atomic_read(&ib_conn->post_send_buf_count) == 0)) { |
9a6d3234 | 792 | complete(&ib_conn->flush_completion); |
1cfa0a75 OG |
793 | } |
794 | } | |
795 | ||
796 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
797 | { | |
504130c0 AN |
798 | struct iser_conn *ib_conn; |
799 | ||
800 | ib_conn = (struct iser_conn *)cma_id->context; | |
4f363882 RD |
801 | iser_info("event %d status %d conn %p id %p\n", |
802 | event->event, event->status, cma_id->context, cma_id); | |
1cfa0a75 | 803 | |
504130c0 | 804 | mutex_lock(&ib_conn->state_mutex); |
1cfa0a75 OG |
805 | switch (event->event) { |
806 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
b73c3ada | 807 | iser_addr_handler(cma_id); |
1cfa0a75 OG |
808 | break; |
809 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
b73c3ada | 810 | iser_route_handler(cma_id); |
1cfa0a75 OG |
811 | break; |
812 | case RDMA_CM_EVENT_ESTABLISHED: | |
813 | iser_connected_handler(cma_id); | |
814 | break; | |
815 | case RDMA_CM_EVENT_ADDR_ERROR: | |
816 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
817 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
818 | case RDMA_CM_EVENT_UNREACHABLE: | |
819 | case RDMA_CM_EVENT_REJECTED: | |
b73c3ada | 820 | iser_connect_error(cma_id); |
1cfa0a75 OG |
821 | break; |
822 | case RDMA_CM_EVENT_DISCONNECTED: | |
1cfa0a75 | 823 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
2f5de151 | 824 | case RDMA_CM_EVENT_ADDR_CHANGE: |
9579d603 | 825 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
b73c3ada | 826 | iser_disconnected_handler(cma_id); |
1cfa0a75 | 827 | break; |
1cfa0a75 | 828 | default: |
a4ef1451 | 829 | iser_err("Unexpected RDMA CM event (%d)\n", event->event); |
1cfa0a75 OG |
830 | break; |
831 | } | |
504130c0 | 832 | mutex_unlock(&ib_conn->state_mutex); |
b73c3ada | 833 | return 0; |
1cfa0a75 OG |
834 | } |
835 | ||
412eeafa | 836 | void iser_conn_init(struct iser_conn *ib_conn) |
1cfa0a75 | 837 | { |
1cfa0a75 | 838 | ib_conn->state = ISER_CONN_INIT; |
704315f0 | 839 | ib_conn->post_recv_buf_count = 0; |
1cfa0a75 | 840 | atomic_set(&ib_conn->post_send_buf_count, 0); |
b73c3ada | 841 | init_completion(&ib_conn->stop_completion); |
9a6d3234 AN |
842 | init_completion(&ib_conn->flush_completion); |
843 | init_completion(&ib_conn->up_completion); | |
1cfa0a75 OG |
844 | INIT_LIST_HEAD(&ib_conn->conn_list); |
845 | spin_lock_init(&ib_conn->lock); | |
504130c0 | 846 | mutex_init(&ib_conn->state_mutex); |
1cfa0a75 OG |
847 | } |
848 | ||
849 | /** | |
850 | * starts the process of connecting to the target | |
94e2bd68 | 851 | * sleeps until the connection is established or rejected |
1cfa0a75 OG |
852 | */ |
853 | int iser_connect(struct iser_conn *ib_conn, | |
96ed02d4 RD |
854 | struct sockaddr *src_addr, |
855 | struct sockaddr *dst_addr, | |
1cfa0a75 OG |
856 | int non_blocking) |
857 | { | |
1cfa0a75 OG |
858 | int err = 0; |
859 | ||
504130c0 AN |
860 | mutex_lock(&ib_conn->state_mutex); |
861 | ||
96ed02d4 RD |
862 | sprintf(ib_conn->name, "%pISp", dst_addr); |
863 | ||
864 | iser_info("connecting to: %s\n", ib_conn->name); | |
1cfa0a75 OG |
865 | |
866 | /* the device is known only --after-- address resolution */ | |
867 | ib_conn->device = NULL; | |
868 | ||
1cfa0a75 OG |
869 | ib_conn->state = ISER_CONN_PENDING; |
870 | ||
871 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, | |
872 | (void *)ib_conn, | |
b26f9b99 | 873 | RDMA_PS_TCP, IB_QPT_RC); |
1cfa0a75 OG |
874 | if (IS_ERR(ib_conn->cma_id)) { |
875 | err = PTR_ERR(ib_conn->cma_id); | |
876 | iser_err("rdma_create_id failed: %d\n", err); | |
877 | goto id_failure; | |
878 | } | |
879 | ||
96ed02d4 | 880 | err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); |
1cfa0a75 OG |
881 | if (err) { |
882 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
883 | goto addr_failure; | |
884 | } | |
885 | ||
886 | if (!non_blocking) { | |
9a6d3234 | 887 | wait_for_completion_interruptible(&ib_conn->up_completion); |
1cfa0a75 OG |
888 | |
889 | if (ib_conn->state != ISER_CONN_UP) { | |
890 | err = -EIO; | |
891 | goto connect_failure; | |
892 | } | |
893 | } | |
504130c0 | 894 | mutex_unlock(&ib_conn->state_mutex); |
1cfa0a75 OG |
895 | |
896 | mutex_lock(&ig.connlist_mutex); | |
897 | list_add(&ib_conn->conn_list, &ig.connlist); | |
898 | mutex_unlock(&ig.connlist_mutex); | |
899 | return 0; | |
900 | ||
901 | id_failure: | |
902 | ib_conn->cma_id = NULL; | |
903 | addr_failure: | |
904 | ib_conn->state = ISER_CONN_DOWN; | |
905 | connect_failure: | |
504130c0 | 906 | mutex_unlock(&ib_conn->state_mutex); |
b73c3ada | 907 | iser_conn_release(ib_conn); |
1cfa0a75 OG |
908 | return err; |
909 | } | |
910 | ||
1cfa0a75 OG |
911 | /** |
912 | * iser_reg_page_vec - Register physical memory | |
913 | * | |
914 | * returns: 0 on success, errno code on failure | |
915 | */ | |
916 | int iser_reg_page_vec(struct iser_conn *ib_conn, | |
917 | struct iser_page_vec *page_vec, | |
918 | struct iser_mem_reg *mem_reg) | |
919 | { | |
920 | struct ib_pool_fmr *mem; | |
921 | u64 io_addr; | |
922 | u64 *page_list; | |
923 | int status; | |
924 | ||
925 | page_list = page_vec->pages; | |
926 | io_addr = page_list[0]; | |
927 | ||
7306b8fa | 928 | mem = ib_fmr_pool_map_phys(ib_conn->fmr.pool, |
1cfa0a75 OG |
929 | page_list, |
930 | page_vec->length, | |
adfaa888 | 931 | io_addr); |
1cfa0a75 OG |
932 | |
933 | if (IS_ERR(mem)) { | |
934 | status = (int)PTR_ERR(mem); | |
935 | iser_err("ib_fmr_pool_map_phys failed: %d\n", status); | |
936 | return status; | |
937 | } | |
938 | ||
939 | mem_reg->lkey = mem->fmr->lkey; | |
940 | mem_reg->rkey = mem->fmr->rkey; | |
8dfa0876 | 941 | mem_reg->len = page_vec->length * SIZE_4K; |
1cfa0a75 | 942 | mem_reg->va = io_addr; |
5587856c | 943 | mem_reg->is_mr = 1; |
1cfa0a75 OG |
944 | mem_reg->mem_h = (void *)mem; |
945 | ||
946 | mem_reg->va += page_vec->offset; | |
947 | mem_reg->len = page_vec->data_size; | |
948 | ||
949 | iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " | |
950 | "entry[0]: (0x%08lx,%ld)] -> " | |
951 | "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", | |
952 | page_vec, page_vec->length, | |
953 | (unsigned long)page_vec->pages[0], | |
954 | (unsigned long)page_vec->data_size, | |
955 | (unsigned int)mem_reg->lkey, mem_reg->mem_h, | |
956 | (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); | |
957 | return 0; | |
958 | } | |
959 | ||
960 | /** | |
e657571b SG |
961 | * Unregister (previosuly registered using FMR) memory. |
962 | * If memory is non-FMR does nothing. | |
1cfa0a75 | 963 | */ |
e657571b SG |
964 | void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, |
965 | enum iser_data_dir cmd_dir) | |
1cfa0a75 | 966 | { |
b4e155ff | 967 | struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; |
1cfa0a75 OG |
968 | int ret; |
969 | ||
5587856c | 970 | if (!reg->is_mr) |
b4e155ff SG |
971 | return; |
972 | ||
1cfa0a75 OG |
973 | iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); |
974 | ||
975 | ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); | |
976 | if (ret) | |
977 | iser_err("ib_fmr_pool_unmap failed %d\n", ret); | |
978 | ||
979 | reg->mem_h = NULL; | |
980 | } | |
981 | ||
7306b8fa SG |
982 | void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, |
983 | enum iser_data_dir cmd_dir) | |
5587856c SG |
984 | { |
985 | struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; | |
4667f5df | 986 | struct iser_conn *ib_conn = iser_task->ib_conn; |
5587856c SG |
987 | struct fast_reg_descriptor *desc = reg->mem_h; |
988 | ||
989 | if (!reg->is_mr) | |
990 | return; | |
991 | ||
992 | reg->mem_h = NULL; | |
993 | reg->is_mr = 0; | |
994 | spin_lock_bh(&ib_conn->lock); | |
7306b8fa | 995 | list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
5587856c SG |
996 | spin_unlock_bh(&ib_conn->lock); |
997 | } | |
998 | ||
bcc60c38 OG |
999 | int iser_post_recvl(struct iser_conn *ib_conn) |
1000 | { | |
1001 | struct ib_recv_wr rx_wr, *rx_wr_failed; | |
1002 | struct ib_sge sge; | |
1003 | int ib_ret; | |
1004 | ||
2c4ce609 | 1005 | sge.addr = ib_conn->login_resp_dma; |
bcc60c38 OG |
1006 | sge.length = ISER_RX_LOGIN_SIZE; |
1007 | sge.lkey = ib_conn->device->mr->lkey; | |
1008 | ||
2c4ce609 | 1009 | rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf; |
bcc60c38 OG |
1010 | rx_wr.sg_list = &sge; |
1011 | rx_wr.num_sge = 1; | |
1012 | rx_wr.next = NULL; | |
1013 | ||
704315f0 | 1014 | ib_conn->post_recv_buf_count++; |
bcc60c38 OG |
1015 | ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); |
1016 | if (ib_ret) { | |
1017 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 1018 | ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
1019 | } |
1020 | return ib_ret; | |
1021 | } | |
1022 | ||
1023 | int iser_post_recvm(struct iser_conn *ib_conn, int count) | |
1024 | { | |
1025 | struct ib_recv_wr *rx_wr, *rx_wr_failed; | |
1026 | int i, ib_ret; | |
1027 | unsigned int my_rx_head = ib_conn->rx_desc_head; | |
1028 | struct iser_rx_desc *rx_desc; | |
1029 | ||
1030 | for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { | |
1031 | rx_desc = &ib_conn->rx_descs[my_rx_head]; | |
1032 | rx_wr->wr_id = (unsigned long)rx_desc; | |
1033 | rx_wr->sg_list = &rx_desc->rx_sg; | |
1034 | rx_wr->num_sge = 1; | |
1035 | rx_wr->next = rx_wr + 1; | |
b7f04513 | 1036 | my_rx_head = (my_rx_head + 1) & ib_conn->qp_max_recv_dtos_mask; |
bcc60c38 OG |
1037 | } |
1038 | ||
1039 | rx_wr--; | |
1040 | rx_wr->next = NULL; /* mark end of work requests list */ | |
1041 | ||
704315f0 | 1042 | ib_conn->post_recv_buf_count += count; |
bcc60c38 OG |
1043 | ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); |
1044 | if (ib_ret) { | |
1045 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
704315f0 | 1046 | ib_conn->post_recv_buf_count -= count; |
bcc60c38 OG |
1047 | } else |
1048 | ib_conn->rx_desc_head = my_rx_head; | |
1049 | return ib_ret; | |
1050 | } | |
1051 | ||
1052 | ||
1cfa0a75 OG |
1053 | /** |
1054 | * iser_start_send - Initiate a Send DTO operation | |
1055 | * | |
1056 | * returns 0 on success, -1 on failure | |
1057 | */ | |
f19624aa | 1058 | int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) |
1cfa0a75 | 1059 | { |
f19624aa | 1060 | int ib_ret; |
1cfa0a75 | 1061 | struct ib_send_wr send_wr, *send_wr_failed; |
1cfa0a75 | 1062 | |
f19624aa OG |
1063 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
1064 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
1cfa0a75 OG |
1065 | |
1066 | send_wr.next = NULL; | |
1067 | send_wr.wr_id = (unsigned long)tx_desc; | |
f19624aa OG |
1068 | send_wr.sg_list = tx_desc->tx_sg; |
1069 | send_wr.num_sge = tx_desc->num_sge; | |
1cfa0a75 | 1070 | send_wr.opcode = IB_WR_SEND; |
f19624aa | 1071 | send_wr.send_flags = IB_SEND_SIGNALED; |
1cfa0a75 OG |
1072 | |
1073 | atomic_inc(&ib_conn->post_send_buf_count); | |
1074 | ||
1075 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); | |
1076 | if (ib_ret) { | |
1cfa0a75 OG |
1077 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
1078 | atomic_dec(&ib_conn->post_send_buf_count); | |
1cfa0a75 | 1079 | } |
f19624aa | 1080 | return ib_ret; |
1cfa0a75 OG |
1081 | } |
1082 | ||
f19624aa | 1083 | static void iser_handle_comp_error(struct iser_tx_desc *desc, |
bcc60c38 | 1084 | struct iser_conn *ib_conn) |
1cfa0a75 | 1085 | { |
78ad0a34 OG |
1086 | if (desc && desc->type == ISCSI_TX_DATAOUT) |
1087 | kmem_cache_free(ig.desc_cache, desc); | |
1cfa0a75 | 1088 | |
704315f0 | 1089 | if (ib_conn->post_recv_buf_count == 0 && |
1d426d64 | 1090 | atomic_read(&ib_conn->post_send_buf_count) == 0) { |
504130c0 AN |
1091 | /** |
1092 | * getting here when the state is UP means that the conn is | |
1093 | * being terminated asynchronously from the iSCSI layer's | |
1094 | * perspective. It is safe to peek at the connection state | |
1095 | * since iscsi_conn_failure is allowed to be called twice. | |
1096 | **/ | |
1097 | if (ib_conn->state == ISER_CONN_UP) | |
4667f5df | 1098 | iscsi_conn_failure(ib_conn->iscsi_conn, |
1d426d64 EZ |
1099 | ISCSI_ERR_CONN_FAILED); |
1100 | ||
39ff05db OG |
1101 | /* no more non completed posts to the QP, complete the |
1102 | * termination process w.o worrying on disconnect event */ | |
9a6d3234 | 1103 | complete(&ib_conn->flush_completion); |
1d426d64 | 1104 | } |
1cfa0a75 OG |
1105 | } |
1106 | ||
5a33a669 | 1107 | static int iser_drain_tx_cq(struct iser_device *device, int cq_index) |
78ad0a34 | 1108 | { |
5a33a669 | 1109 | struct ib_cq *cq = device->tx_cq[cq_index]; |
78ad0a34 | 1110 | struct ib_wc wc; |
f19624aa | 1111 | struct iser_tx_desc *tx_desc; |
78ad0a34 OG |
1112 | struct iser_conn *ib_conn; |
1113 | int completed_tx = 0; | |
1114 | ||
1115 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
f19624aa | 1116 | tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; |
78ad0a34 OG |
1117 | ib_conn = wc.qp->qp_context; |
1118 | if (wc.status == IB_WC_SUCCESS) { | |
1119 | if (wc.opcode == IB_WC_SEND) | |
f19624aa | 1120 | iser_snd_completion(tx_desc, ib_conn); |
db523b8d | 1121 | else |
78ad0a34 OG |
1122 | iser_err("expected opcode %d got %d\n", |
1123 | IB_WC_SEND, wc.opcode); | |
1124 | } else { | |
1125 | iser_err("tx id %llx status %d vend_err %x\n", | |
db523b8d | 1126 | wc.wr_id, wc.status, wc.vendor_err); |
7306b8fa | 1127 | if (wc.wr_id != ISER_FASTREG_LI_WRID) { |
db523b8d SG |
1128 | atomic_dec(&ib_conn->post_send_buf_count); |
1129 | iser_handle_comp_error(tx_desc, ib_conn); | |
1130 | } | |
78ad0a34 OG |
1131 | } |
1132 | completed_tx++; | |
1133 | } | |
1134 | return completed_tx; | |
1135 | } | |
1136 | ||
1137 | ||
1cfa0a75 OG |
1138 | static void iser_cq_tasklet_fn(unsigned long data) |
1139 | { | |
5a33a669 AT |
1140 | struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data; |
1141 | struct iser_device *device = cq_desc->device; | |
1142 | int cq_index = cq_desc->cq_index; | |
1143 | struct ib_cq *cq = device->rx_cq[cq_index]; | |
1cfa0a75 | 1144 | struct ib_wc wc; |
78ad0a34 | 1145 | struct iser_rx_desc *desc; |
1cfa0a75 | 1146 | unsigned long xfer_len; |
bcc60c38 | 1147 | struct iser_conn *ib_conn; |
1d6c2b73 RD |
1148 | int completed_tx, completed_rx = 0; |
1149 | ||
1150 | /* First do tx drain, so in a case where we have rx flushes and a successful | |
1151 | * tx completion we will still go through completion error handling. | |
1152 | */ | |
1153 | completed_tx = iser_drain_tx_cq(device, cq_index); | |
1cfa0a75 OG |
1154 | |
1155 | while (ib_poll_cq(cq, 1, &wc) == 1) { | |
78ad0a34 | 1156 | desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; |
1cfa0a75 | 1157 | BUG_ON(desc == NULL); |
bcc60c38 | 1158 | ib_conn = wc.qp->qp_context; |
1cfa0a75 | 1159 | if (wc.status == IB_WC_SUCCESS) { |
bcc60c38 | 1160 | if (wc.opcode == IB_WC_RECV) { |
1cfa0a75 | 1161 | xfer_len = (unsigned long)wc.byte_len; |
78ad0a34 OG |
1162 | iser_rcv_completion(desc, xfer_len, ib_conn); |
1163 | } else | |
1164 | iser_err("expected opcode %d got %d\n", | |
1165 | IB_WC_RECV, wc.opcode); | |
1cfa0a75 | 1166 | } else { |
bcc60c38 | 1167 | if (wc.status != IB_WC_WR_FLUSH_ERR) |
78ad0a34 | 1168 | iser_err("rx id %llx status %d vend_err %x\n", |
bcc60c38 | 1169 | wc.wr_id, wc.status, wc.vendor_err); |
78ad0a34 OG |
1170 | ib_conn->post_recv_buf_count--; |
1171 | iser_handle_comp_error(NULL, ib_conn); | |
1cfa0a75 | 1172 | } |
78ad0a34 OG |
1173 | completed_rx++; |
1174 | if (!(completed_rx & 63)) | |
5a33a669 | 1175 | completed_tx += iser_drain_tx_cq(device, cq_index); |
1cfa0a75 OG |
1176 | } |
1177 | /* #warning "it is assumed here that arming CQ only once its empty" * | |
1178 | * " would not cause interrupts to be missed" */ | |
1179 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
78ad0a34 | 1180 | |
78ad0a34 | 1181 | iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); |
1cfa0a75 OG |
1182 | } |
1183 | ||
1184 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
1185 | { | |
5a33a669 AT |
1186 | struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context; |
1187 | struct iser_device *device = cq_desc->device; | |
1188 | int cq_index = cq_desc->cq_index; | |
1cfa0a75 | 1189 | |
5a33a669 | 1190 | tasklet_schedule(&device->cq_tasklet[cq_index]); |
1cfa0a75 | 1191 | } |
0a7a08ad SG |
1192 | |
1193 | u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, | |
1194 | enum iser_data_dir cmd_dir, sector_t *sector) | |
1195 | { | |
1196 | struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg; | |
1197 | struct fast_reg_descriptor *desc = reg->mem_h; | |
1198 | unsigned long sector_size = iser_task->sc->device->sector_size; | |
1199 | struct ib_mr_status mr_status; | |
1200 | int ret; | |
1201 | ||
1202 | if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) { | |
1203 | desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; | |
1204 | ret = ib_check_mr_status(desc->pi_ctx->sig_mr, | |
1205 | IB_MR_CHECK_SIG_STATUS, &mr_status); | |
1206 | if (ret) { | |
1207 | pr_err("ib_check_mr_status failed, ret %d\n", ret); | |
1208 | goto err; | |
1209 | } | |
1210 | ||
1211 | if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { | |
1212 | sector_t sector_off = mr_status.sig_err.sig_err_offset; | |
1213 | ||
1214 | do_div(sector_off, sector_size + 8); | |
1215 | *sector = scsi_get_lba(iser_task->sc) + sector_off; | |
1216 | ||
39c978cd | 1217 | pr_err("PI error found type %d at sector %llx " |
0a7a08ad | 1218 | "expected %x vs actual %x\n", |
39c978cd RD |
1219 | mr_status.sig_err.err_type, |
1220 | (unsigned long long)*sector, | |
0a7a08ad SG |
1221 | mr_status.sig_err.expected, |
1222 | mr_status.sig_err.actual); | |
1223 | ||
1224 | switch (mr_status.sig_err.err_type) { | |
1225 | case IB_SIG_BAD_GUARD: | |
1226 | return 0x1; | |
1227 | case IB_SIG_BAD_REFTAG: | |
1228 | return 0x3; | |
1229 | case IB_SIG_BAD_APPTAG: | |
1230 | return 0x2; | |
1231 | } | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | return 0; | |
1236 | err: | |
1237 | /* Not alot we can do here, return ambiguous guard error */ | |
1238 | return 0x1; | |
1239 | } |