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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 | |
6aabfa76 SG |
42 | #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) |
43 | #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) | |
ff3dd52d SG |
44 | #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \ |
45 | ISCSI_ISER_MAX_CONN) | |
1cfa0a75 | 46 | |
183cfa43 SG |
47 | static int iser_cq_poll_limit = 512; |
48 | ||
1cfa0a75 OG |
49 | static void iser_cq_tasklet_fn(unsigned long data); |
50 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context); | |
1cfa0a75 OG |
51 | |
52 | static void iser_cq_event_callback(struct ib_event *cause, void *context) | |
53 | { | |
871e00af SG |
54 | iser_err("cq event %s (%d)\n", |
55 | ib_event_msg(cause->event), cause->event); | |
1cfa0a75 OG |
56 | } |
57 | ||
58 | static void iser_qp_event_callback(struct ib_event *cause, void *context) | |
59 | { | |
871e00af SG |
60 | iser_err("qp event %s (%d)\n", |
61 | ib_event_msg(cause->event), cause->event); | |
1cfa0a75 OG |
62 | } |
63 | ||
2110f9bf OG |
64 | static void iser_event_handler(struct ib_event_handler *handler, |
65 | struct ib_event *event) | |
66 | { | |
871e00af SG |
67 | iser_err("async event %s (%d) on device %s port %d\n", |
68 | ib_event_msg(event->event), event->event, | |
69 | event->device->name, event->element.port_num); | |
2110f9bf OG |
70 | } |
71 | ||
1cfa0a75 OG |
72 | /** |
73 | * iser_create_device_ib_res - creates Protection Domain (PD), Completion | |
74 | * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with | |
75 | * the adapator. | |
76 | * | |
77 | * returns 0 on success, -1 on failure | |
78 | */ | |
79 | static int iser_create_device_ib_res(struct iser_device *device) | |
80 | { | |
65198d6b | 81 | struct ib_device_attr *dev_attr = &device->dev_attr; |
f4641ef7 | 82 | int ret, i, max_cqe; |
5a33a669 | 83 | |
65198d6b SG |
84 | ret = ib_query_device(device->ib_device, dev_attr); |
85 | if (ret) { | |
5587856c | 86 | pr_warn("Query device failed for %s\n", device->ib_device->name); |
65198d6b | 87 | return ret; |
5587856c SG |
88 | } |
89 | ||
90 | /* Assign function handles - based on FMR support */ | |
91 | if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr && | |
92 | device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) { | |
93 | iser_info("FMR supported, using FMR for registration\n"); | |
94 | device->iser_alloc_rdma_reg_res = iser_create_fmr_pool; | |
95 | device->iser_free_rdma_reg_res = iser_free_fmr_pool; | |
96 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr; | |
97 | device->iser_unreg_rdma_mem = iser_unreg_mem_fmr; | |
98 | } else | |
99 | if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { | |
7306b8fa SG |
100 | iser_info("FastReg supported, using FastReg for registration\n"); |
101 | device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool; | |
102 | device->iser_free_rdma_reg_res = iser_free_fastreg_pool; | |
103 | device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg; | |
104 | device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg; | |
5587856c | 105 | } else { |
7306b8fa | 106 | iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n"); |
65198d6b | 107 | return -1; |
5587856c | 108 | } |
b4e155ff | 109 | |
da64bdb2 | 110 | device->comps_used = min_t(int, num_online_cpus(), |
bf175540 | 111 | device->ib_device->num_comp_vectors); |
f4641ef7 | 112 | |
da64bdb2 SG |
113 | device->comps = kcalloc(device->comps_used, sizeof(*device->comps), |
114 | GFP_KERNEL); | |
115 | if (!device->comps) | |
116 | goto comps_err; | |
117 | ||
f4641ef7 MT |
118 | max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe); |
119 | ||
120 | iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n", | |
bf175540 | 121 | device->comps_used, device->ib_device->name, |
f4641ef7 | 122 | device->ib_device->num_comp_vectors, max_cqe); |
5a33a669 | 123 | |
1cfa0a75 OG |
124 | device->pd = ib_alloc_pd(device->ib_device); |
125 | if (IS_ERR(device->pd)) | |
126 | goto pd_err; | |
127 | ||
bf175540 | 128 | for (i = 0; i < device->comps_used; i++) { |
8e37210b | 129 | struct ib_cq_init_attr cq_attr = {}; |
bf175540 SG |
130 | struct iser_comp *comp = &device->comps[i]; |
131 | ||
132 | comp->device = device; | |
8e37210b MB |
133 | cq_attr.cqe = max_cqe; |
134 | cq_attr.comp_vector = i; | |
6aabfa76 SG |
135 | comp->cq = ib_create_cq(device->ib_device, |
136 | iser_cq_callback, | |
137 | iser_cq_event_callback, | |
138 | (void *)comp, | |
8e37210b | 139 | &cq_attr); |
6aabfa76 SG |
140 | if (IS_ERR(comp->cq)) { |
141 | comp->cq = NULL; | |
5a33a669 | 142 | goto cq_err; |
c33b15f0 | 143 | } |
1cfa0a75 | 144 | |
6aabfa76 | 145 | if (ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP)) |
5a33a669 | 146 | goto cq_err; |
1cfa0a75 | 147 | |
bf175540 SG |
148 | tasklet_init(&comp->tasklet, iser_cq_tasklet_fn, |
149 | (unsigned long)comp); | |
5a33a669 | 150 | } |
1cfa0a75 | 151 | |
d8111028 EZ |
152 | device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | |
153 | IB_ACCESS_REMOTE_WRITE | | |
154 | IB_ACCESS_REMOTE_READ); | |
1cfa0a75 OG |
155 | if (IS_ERR(device->mr)) |
156 | goto dma_mr_err; | |
157 | ||
2110f9bf OG |
158 | INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, |
159 | iser_event_handler); | |
160 | if (ib_register_event_handler(&device->event_handler)) | |
161 | goto handler_err; | |
162 | ||
1cfa0a75 OG |
163 | return 0; |
164 | ||
2110f9bf OG |
165 | handler_err: |
166 | ib_dereg_mr(device->mr); | |
1cfa0a75 | 167 | dma_mr_err: |
bf175540 SG |
168 | for (i = 0; i < device->comps_used; i++) |
169 | tasklet_kill(&device->comps[i].tasklet); | |
5a33a669 | 170 | cq_err: |
bf175540 SG |
171 | for (i = 0; i < device->comps_used; i++) { |
172 | struct iser_comp *comp = &device->comps[i]; | |
173 | ||
6aabfa76 SG |
174 | if (comp->cq) |
175 | ib_destroy_cq(comp->cq); | |
5a33a669 | 176 | } |
1cfa0a75 OG |
177 | ib_dealloc_pd(device->pd); |
178 | pd_err: | |
da64bdb2 SG |
179 | kfree(device->comps); |
180 | comps_err: | |
1cfa0a75 OG |
181 | iser_err("failed to allocate an IB resource\n"); |
182 | return -1; | |
183 | } | |
184 | ||
185 | /** | |
38dc732f | 186 | * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, |
1cfa0a75 OG |
187 | * CQ and PD created with the device associated with the adapator. |
188 | */ | |
189 | static void iser_free_device_ib_res(struct iser_device *device) | |
190 | { | |
5a33a669 | 191 | int i; |
1cfa0a75 OG |
192 | BUG_ON(device->mr == NULL); |
193 | ||
bf175540 SG |
194 | for (i = 0; i < device->comps_used; i++) { |
195 | struct iser_comp *comp = &device->comps[i]; | |
196 | ||
197 | tasklet_kill(&comp->tasklet); | |
6aabfa76 SG |
198 | ib_destroy_cq(comp->cq); |
199 | comp->cq = NULL; | |
5a33a669 AT |
200 | } |
201 | ||
2110f9bf | 202 | (void)ib_unregister_event_handler(&device->event_handler); |
1cfa0a75 | 203 | (void)ib_dereg_mr(device->mr); |
1cfa0a75 OG |
204 | (void)ib_dealloc_pd(device->pd); |
205 | ||
da64bdb2 SG |
206 | kfree(device->comps); |
207 | device->comps = NULL; | |
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 | */ |
a4ee3539 | 218 | int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max) |
1cfa0a75 | 219 | { |
a4ee3539 | 220 | struct iser_device *device = ib_conn->device; |
1cfa0a75 | 221 | struct ib_fmr_pool_param params; |
986db0d6 | 222 | int ret = -ENOMEM; |
bcc60c38 | 223 | |
a4ee3539 | 224 | ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) + |
7306b8fa SG |
225 | (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)), |
226 | GFP_KERNEL); | |
a4ee3539 | 227 | if (!ib_conn->fmr.page_vec) |
986db0d6 | 228 | return ret; |
9fda1ac5 | 229 | |
a4ee3539 | 230 | ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->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 | ||
a4ee3539 SG |
246 | ib_conn->fmr.pool = ib_create_fmr_pool(device->pd, ¶ms); |
247 | if (!IS_ERR(ib_conn->fmr.pool)) | |
986db0d6 SP |
248 | return 0; |
249 | ||
250 | /* no FMR => no need for page_vec */ | |
a4ee3539 SG |
251 | kfree(ib_conn->fmr.page_vec); |
252 | ib_conn->fmr.page_vec = NULL; | |
986db0d6 | 253 | |
a4ee3539 SG |
254 | ret = PTR_ERR(ib_conn->fmr.pool); |
255 | ib_conn->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 | */ | |
a4ee3539 | 268 | void iser_free_fmr_pool(struct ib_conn *ib_conn) |
986db0d6 SP |
269 | { |
270 | iser_info("freeing conn %p fmr pool %p\n", | |
a4ee3539 | 271 | ib_conn, ib_conn->fmr.pool); |
986db0d6 | 272 | |
a4ee3539 SG |
273 | if (ib_conn->fmr.pool != NULL) |
274 | ib_destroy_fmr_pool(ib_conn->fmr.pool); | |
986db0d6 | 275 | |
a4ee3539 | 276 | ib_conn->fmr.pool = NULL; |
986db0d6 | 277 | |
a4ee3539 SG |
278 | kfree(ib_conn->fmr.page_vec); |
279 | ib_conn->fmr.page_vec = NULL; | |
986db0d6 SP |
280 | } |
281 | ||
4dec2a27 SG |
282 | static int |
283 | iser_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd, | |
284 | struct fast_reg_descriptor *desc) | |
285 | { | |
286 | struct iser_pi_context *pi_ctx = NULL; | |
287 | struct ib_mr_init_attr mr_init_attr = {.max_reg_descriptors = 2, | |
288 | .flags = IB_MR_SIGNATURE_EN}; | |
289 | int ret = 0; | |
290 | ||
291 | desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); | |
292 | if (!desc->pi_ctx) | |
293 | return -ENOMEM; | |
294 | ||
295 | pi_ctx = desc->pi_ctx; | |
296 | ||
297 | pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device, | |
298 | ISCSI_ISER_SG_TABLESIZE); | |
299 | if (IS_ERR(pi_ctx->prot_frpl)) { | |
300 | ret = PTR_ERR(pi_ctx->prot_frpl); | |
301 | goto prot_frpl_failure; | |
302 | } | |
303 | ||
304 | pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, | |
305 | ISCSI_ISER_SG_TABLESIZE + 1); | |
306 | if (IS_ERR(pi_ctx->prot_mr)) { | |
307 | ret = PTR_ERR(pi_ctx->prot_mr); | |
308 | goto prot_mr_failure; | |
309 | } | |
310 | desc->reg_indicators |= ISER_PROT_KEY_VALID; | |
311 | ||
312 | pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr); | |
313 | if (IS_ERR(pi_ctx->sig_mr)) { | |
314 | ret = PTR_ERR(pi_ctx->sig_mr); | |
315 | goto sig_mr_failure; | |
316 | } | |
317 | desc->reg_indicators |= ISER_SIG_KEY_VALID; | |
318 | desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; | |
319 | ||
320 | return 0; | |
321 | ||
322 | sig_mr_failure: | |
323 | ib_dereg_mr(desc->pi_ctx->prot_mr); | |
324 | prot_mr_failure: | |
325 | ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl); | |
326 | prot_frpl_failure: | |
327 | kfree(desc->pi_ctx); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | ||
332 | static void | |
333 | iser_free_pi_ctx(struct iser_pi_context *pi_ctx) | |
334 | { | |
335 | ib_free_fast_reg_page_list(pi_ctx->prot_frpl); | |
336 | ib_dereg_mr(pi_ctx->prot_mr); | |
337 | ib_destroy_mr(pi_ctx->sig_mr); | |
338 | kfree(pi_ctx); | |
339 | } | |
340 | ||
310b347c SG |
341 | static int |
342 | iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd, | |
6b5a8fb0 | 343 | bool pi_enable, struct fast_reg_descriptor *desc) |
310b347c SG |
344 | { |
345 | int ret; | |
346 | ||
347 | desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, | |
348 | ISCSI_ISER_SG_TABLESIZE + 1); | |
349 | if (IS_ERR(desc->data_frpl)) { | |
350 | ret = PTR_ERR(desc->data_frpl); | |
351 | iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n", | |
352 | ret); | |
353 | return PTR_ERR(desc->data_frpl); | |
354 | } | |
355 | ||
356 | desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1); | |
357 | if (IS_ERR(desc->data_mr)) { | |
358 | ret = PTR_ERR(desc->data_mr); | |
359 | iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); | |
360 | goto fast_reg_mr_failure; | |
361 | } | |
6b5a8fb0 AT |
362 | desc->reg_indicators |= ISER_DATA_KEY_VALID; |
363 | ||
364 | if (pi_enable) { | |
4dec2a27 SG |
365 | ret = iser_alloc_pi_ctx(ib_device, pd, desc); |
366 | if (ret) | |
6b5a8fb0 | 367 | goto pi_ctx_alloc_failure; |
6b5a8fb0 | 368 | } |
310b347c SG |
369 | |
370 | return 0; | |
6b5a8fb0 AT |
371 | pi_ctx_alloc_failure: |
372 | ib_dereg_mr(desc->data_mr); | |
310b347c SG |
373 | fast_reg_mr_failure: |
374 | ib_free_fast_reg_page_list(desc->data_frpl); | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
5587856c | 379 | /** |
7306b8fa | 380 | * iser_create_fastreg_pool - Creates pool of fast_reg descriptors |
5587856c SG |
381 | * for fast registration work requests. |
382 | * returns 0 on success, or errno code on failure | |
383 | */ | |
a4ee3539 | 384 | int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max) |
5587856c | 385 | { |
a4ee3539 SG |
386 | struct iser_device *device = ib_conn->device; |
387 | struct fast_reg_descriptor *desc; | |
5587856c SG |
388 | int i, ret; |
389 | ||
a4ee3539 SG |
390 | INIT_LIST_HEAD(&ib_conn->fastreg.pool); |
391 | ib_conn->fastreg.pool_size = 0; | |
5587856c | 392 | for (i = 0; i < cmds_max; i++) { |
6b5a8fb0 | 393 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); |
5587856c SG |
394 | if (!desc) { |
395 | iser_err("Failed to allocate a new fast_reg descriptor\n"); | |
396 | ret = -ENOMEM; | |
397 | goto err; | |
398 | } | |
399 | ||
6b5a8fb0 | 400 | ret = iser_create_fastreg_desc(device->ib_device, device->pd, |
a4ee3539 | 401 | ib_conn->pi_support, desc); |
310b347c SG |
402 | if (ret) { |
403 | iser_err("Failed to create fastreg descriptor err=%d\n", | |
404 | ret); | |
405 | kfree(desc); | |
406 | goto err; | |
5587856c SG |
407 | } |
408 | ||
a4ee3539 SG |
409 | list_add_tail(&desc->list, &ib_conn->fastreg.pool); |
410 | ib_conn->fastreg.pool_size++; | |
5587856c SG |
411 | } |
412 | ||
413 | return 0; | |
27ae2d1e | 414 | |
5587856c | 415 | err: |
a4ee3539 | 416 | iser_free_fastreg_pool(ib_conn); |
5587856c SG |
417 | return ret; |
418 | } | |
419 | ||
420 | /** | |
7306b8fa | 421 | * iser_free_fastreg_pool - releases the pool of fast_reg descriptors |
5587856c | 422 | */ |
a4ee3539 | 423 | void iser_free_fastreg_pool(struct ib_conn *ib_conn) |
5587856c SG |
424 | { |
425 | struct fast_reg_descriptor *desc, *tmp; | |
426 | int i = 0; | |
427 | ||
a4ee3539 | 428 | if (list_empty(&ib_conn->fastreg.pool)) |
5587856c SG |
429 | return; |
430 | ||
a4ee3539 | 431 | iser_info("freeing conn %p fr pool\n", ib_conn); |
5587856c | 432 | |
a4ee3539 | 433 | list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) { |
5587856c SG |
434 | list_del(&desc->list); |
435 | ib_free_fast_reg_page_list(desc->data_frpl); | |
436 | ib_dereg_mr(desc->data_mr); | |
4dec2a27 SG |
437 | if (desc->pi_ctx) |
438 | iser_free_pi_ctx(desc->pi_ctx); | |
5587856c SG |
439 | kfree(desc); |
440 | ++i; | |
441 | } | |
442 | ||
a4ee3539 | 443 | if (i < ib_conn->fastreg.pool_size) |
5587856c | 444 | iser_warn("pool still has %d regions registered\n", |
a4ee3539 | 445 | ib_conn->fastreg.pool_size - i); |
5587856c SG |
446 | } |
447 | ||
986db0d6 SP |
448 | /** |
449 | * iser_create_ib_conn_res - Queue-Pair (QP) | |
450 | * | |
451 | * returns 0 on success, -1 on failure | |
452 | */ | |
a4ee3539 | 453 | static int iser_create_ib_conn_res(struct ib_conn *ib_conn) |
986db0d6 | 454 | { |
f4641ef7 MT |
455 | struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, |
456 | ib_conn); | |
986db0d6 | 457 | struct iser_device *device; |
f4641ef7 | 458 | struct ib_device_attr *dev_attr; |
986db0d6 SP |
459 | struct ib_qp_init_attr init_attr; |
460 | int ret = -ENOMEM; | |
461 | int index, min_index = 0; | |
462 | ||
a4ee3539 | 463 | BUG_ON(ib_conn->device == NULL); |
986db0d6 | 464 | |
a4ee3539 | 465 | device = ib_conn->device; |
f4641ef7 | 466 | dev_attr = &device->dev_attr; |
1cfa0a75 OG |
467 | |
468 | memset(&init_attr, 0, sizeof init_attr); | |
469 | ||
5a33a669 AT |
470 | mutex_lock(&ig.connlist_mutex); |
471 | /* select the CQ with the minimal number of usages */ | |
bf175540 SG |
472 | for (index = 0; index < device->comps_used; index++) { |
473 | if (device->comps[index].active_qps < | |
474 | device->comps[min_index].active_qps) | |
5a33a669 | 475 | min_index = index; |
bf175540 SG |
476 | } |
477 | ib_conn->comp = &device->comps[min_index]; | |
478 | ib_conn->comp->active_qps++; | |
5a33a669 | 479 | mutex_unlock(&ig.connlist_mutex); |
a4ee3539 | 480 | iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); |
5a33a669 | 481 | |
1cfa0a75 | 482 | init_attr.event_handler = iser_qp_event_callback; |
a4ee3539 | 483 | init_attr.qp_context = (void *)ib_conn; |
6aabfa76 SG |
484 | init_attr.send_cq = ib_conn->comp->cq; |
485 | init_attr.recv_cq = ib_conn->comp->cq; | |
1cfa0a75 | 486 | init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; |
f19624aa | 487 | init_attr.cap.max_send_sge = 2; |
bcc60c38 | 488 | init_attr.cap.max_recv_sge = 1; |
1cfa0a75 OG |
489 | init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
490 | init_attr.qp_type = IB_QPT_RC; | |
a4ee3539 | 491 | if (ib_conn->pi_support) { |
ff3dd52d | 492 | init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; |
6b5a8fb0 | 493 | init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; |
f4641ef7 MT |
494 | iser_conn->max_cmds = |
495 | ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS); | |
6b5a8fb0 | 496 | } else { |
f4641ef7 MT |
497 | if (dev_attr->max_qp_wr > ISER_QP_MAX_REQ_DTOS) { |
498 | init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; | |
499 | iser_conn->max_cmds = | |
500 | ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS); | |
501 | } else { | |
502 | init_attr.cap.max_send_wr = dev_attr->max_qp_wr; | |
503 | iser_conn->max_cmds = | |
504 | ISER_GET_MAX_XMIT_CMDS(dev_attr->max_qp_wr); | |
505 | iser_dbg("device %s supports max_send_wr %d\n", | |
506 | device->ib_device->name, dev_attr->max_qp_wr); | |
507 | } | |
6b5a8fb0 | 508 | } |
1cfa0a75 | 509 | |
a4ee3539 | 510 | ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); |
1cfa0a75 | 511 | if (ret) |
9fda1ac5 | 512 | goto out_err; |
1cfa0a75 | 513 | |
a4ee3539 | 514 | ib_conn->qp = ib_conn->cma_id->qp; |
986db0d6 | 515 | iser_info("setting conn %p cma_id %p qp %p\n", |
a4ee3539 SG |
516 | ib_conn, ib_conn->cma_id, |
517 | ib_conn->cma_id->qp); | |
1cfa0a75 OG |
518 | return ret; |
519 | ||
9fda1ac5 | 520 | out_err: |
93acb7bb SG |
521 | mutex_lock(&ig.connlist_mutex); |
522 | ib_conn->comp->active_qps--; | |
523 | mutex_unlock(&ig.connlist_mutex); | |
1cfa0a75 | 524 | iser_err("unable to alloc mem or create resource, err %d\n", ret); |
93acb7bb | 525 | |
1cfa0a75 OG |
526 | return ret; |
527 | } | |
528 | ||
1cfa0a75 OG |
529 | /** |
530 | * based on the resolved device node GUID see if there already allocated | |
531 | * device for this device. If there's no such, create one. | |
532 | */ | |
533 | static | |
534 | struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) | |
535 | { | |
9a378270 | 536 | struct iser_device *device; |
1cfa0a75 OG |
537 | |
538 | mutex_lock(&ig.device_list_mutex); | |
539 | ||
9a378270 | 540 | list_for_each_entry(device, &ig.device_list, ig_list) |
1cfa0a75 OG |
541 | /* find if there's a match using the node GUID */ |
542 | if (device->ib_device->node_guid == cma_id->device->node_guid) | |
d33ed425 | 543 | goto inc_refcnt; |
9a378270 AR |
544 | |
545 | device = kzalloc(sizeof *device, GFP_KERNEL); | |
546 | if (device == NULL) | |
547 | goto out; | |
548 | ||
549 | /* assign this device to the device */ | |
550 | device->ib_device = cma_id->device; | |
551 | /* init the device and link it into ig device list */ | |
552 | if (iser_create_device_ib_res(device)) { | |
553 | kfree(device); | |
554 | device = NULL; | |
555 | goto out; | |
1cfa0a75 | 556 | } |
9a378270 AR |
557 | list_add(&device->ig_list, &ig.device_list); |
558 | ||
d33ed425 | 559 | inc_refcnt: |
1cfa0a75 | 560 | device->refcount++; |
d33ed425 | 561 | out: |
1cfa0a75 OG |
562 | mutex_unlock(&ig.device_list_mutex); |
563 | return device; | |
564 | } | |
565 | ||
566 | /* if there's no demand for this device, release it */ | |
567 | static void iser_device_try_release(struct iser_device *device) | |
568 | { | |
569 | mutex_lock(&ig.device_list_mutex); | |
570 | device->refcount--; | |
4f363882 | 571 | iser_info("device %p refcount %d\n", device, device->refcount); |
1cfa0a75 OG |
572 | if (!device->refcount) { |
573 | iser_free_device_ib_res(device); | |
574 | list_del(&device->ig_list); | |
575 | kfree(device); | |
576 | } | |
577 | mutex_unlock(&ig.device_list_mutex); | |
578 | } | |
579 | ||
504130c0 AN |
580 | /** |
581 | * Called with state mutex held | |
582 | **/ | |
5716af6e SG |
583 | static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, |
584 | enum iser_conn_state comp, | |
585 | enum iser_conn_state exch) | |
1cfa0a75 OG |
586 | { |
587 | int ret; | |
588 | ||
5716af6e SG |
589 | ret = (iser_conn->state == comp); |
590 | if (ret) | |
591 | iser_conn->state = exch; | |
592 | ||
1cfa0a75 OG |
593 | return ret; |
594 | } | |
595 | ||
b73c3ada AN |
596 | void iser_release_work(struct work_struct *work) |
597 | { | |
5716af6e | 598 | struct iser_conn *iser_conn; |
b73c3ada | 599 | |
5716af6e | 600 | iser_conn = container_of(work, struct iser_conn, release_work); |
b73c3ada | 601 | |
c107a6c0 SG |
602 | /* Wait for conn_stop to complete */ |
603 | wait_for_completion(&iser_conn->stop_completion); | |
604 | /* Wait for IB resouces cleanup to complete */ | |
605 | wait_for_completion(&iser_conn->ib_completion); | |
b73c3ada | 606 | |
5716af6e SG |
607 | mutex_lock(&iser_conn->state_mutex); |
608 | iser_conn->state = ISER_CONN_DOWN; | |
609 | mutex_unlock(&iser_conn->state_mutex); | |
504130c0 | 610 | |
5716af6e | 611 | iser_conn_release(iser_conn); |
b73c3ada AN |
612 | } |
613 | ||
96f15198 SG |
614 | /** |
615 | * iser_free_ib_conn_res - release IB related resources | |
616 | * @iser_conn: iser connection struct | |
6606e6a2 SG |
617 | * @destroy: indicator if we need to try to release the |
618 | * iser device and memory regoins pool (only iscsi | |
619 | * shutdown and DEVICE_REMOVAL will use this). | |
96f15198 SG |
620 | * |
621 | * This routine is called with the iser state mutex held | |
622 | * so the cm_id removal is out of here. It is Safe to | |
623 | * be invoked multiple times. | |
624 | */ | |
c47a3c9e | 625 | static void iser_free_ib_conn_res(struct iser_conn *iser_conn, |
6606e6a2 | 626 | bool destroy) |
96f15198 SG |
627 | { |
628 | struct ib_conn *ib_conn = &iser_conn->ib_conn; | |
629 | struct iser_device *device = ib_conn->device; | |
630 | ||
631 | iser_info("freeing conn %p cma_id %p qp %p\n", | |
632 | iser_conn, ib_conn->cma_id, ib_conn->qp); | |
633 | ||
96f15198 | 634 | if (ib_conn->qp != NULL) { |
bf175540 | 635 | ib_conn->comp->active_qps--; |
96f15198 SG |
636 | rdma_destroy_qp(ib_conn->cma_id); |
637 | ib_conn->qp = NULL; | |
638 | } | |
639 | ||
6606e6a2 SG |
640 | if (destroy) { |
641 | if (iser_conn->rx_descs) | |
642 | iser_free_rx_descriptors(iser_conn); | |
643 | ||
644 | if (device != NULL) { | |
645 | iser_device_try_release(device); | |
646 | ib_conn->device = NULL; | |
647 | } | |
96f15198 SG |
648 | } |
649 | } | |
650 | ||
41179e2d RD |
651 | /** |
652 | * Frees all conn objects and deallocs conn descriptor | |
653 | */ | |
5716af6e | 654 | void iser_conn_release(struct iser_conn *iser_conn) |
41179e2d | 655 | { |
a4ee3539 | 656 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
41179e2d | 657 | |
41179e2d | 658 | mutex_lock(&ig.connlist_mutex); |
5716af6e | 659 | list_del(&iser_conn->conn_list); |
41179e2d | 660 | mutex_unlock(&ig.connlist_mutex); |
504130c0 | 661 | |
5716af6e | 662 | mutex_lock(&iser_conn->state_mutex); |
9a3119e4 | 663 | /* In case we endup here without ep_disconnect being invoked. */ |
5426b171 | 664 | if (iser_conn->state != ISER_CONN_DOWN) { |
aea8f4df AN |
665 | iser_warn("iser conn %p state %d, expected state down.\n", |
666 | iser_conn, iser_conn->state); | |
9a3119e4 | 667 | iscsi_destroy_endpoint(iser_conn->ep); |
5426b171 AN |
668 | iser_conn->state = ISER_CONN_DOWN; |
669 | } | |
c47a3c9e SG |
670 | /* |
671 | * In case we never got to bind stage, we still need to | |
672 | * release IB resources (which is safe to call more than once). | |
673 | */ | |
674 | iser_free_ib_conn_res(iser_conn, true); | |
5716af6e | 675 | mutex_unlock(&iser_conn->state_mutex); |
504130c0 | 676 | |
a4ee3539 SG |
677 | if (ib_conn->cma_id != NULL) { |
678 | rdma_destroy_id(ib_conn->cma_id); | |
679 | ib_conn->cma_id = NULL; | |
5b61ff43 | 680 | } |
a4ee3539 | 681 | |
5716af6e | 682 | kfree(iser_conn); |
41179e2d RD |
683 | } |
684 | ||
1cfa0a75 OG |
685 | /** |
686 | * triggers start of the disconnect procedures and wait for them to be done | |
c47a3c9e | 687 | * Called with state mutex held |
1cfa0a75 | 688 | */ |
c47a3c9e | 689 | int iser_conn_terminate(struct iser_conn *iser_conn) |
1cfa0a75 | 690 | { |
a4ee3539 | 691 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
ff3dd52d | 692 | struct ib_send_wr *bad_wr; |
1cfa0a75 OG |
693 | int err = 0; |
694 | ||
c47a3c9e SG |
695 | /* terminate the iser conn only if the conn state is UP */ |
696 | if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, | |
697 | ISER_CONN_TERMINATING)) | |
698 | return 0; | |
699 | ||
700 | iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); | |
701 | ||
702 | /* suspend queuing of new iscsi commands */ | |
703 | if (iser_conn->iscsi_conn) | |
704 | iscsi_suspend_queue(iser_conn->iscsi_conn); | |
705 | ||
706 | /* | |
707 | * In case we didn't already clean up the cma_id (peer initiated | |
708 | * a disconnection), we need to Cause the CMA to change the QP | |
709 | * state to ERROR. | |
1cfa0a75 | 710 | */ |
c47a3c9e SG |
711 | if (ib_conn->cma_id) { |
712 | err = rdma_disconnect(ib_conn->cma_id); | |
713 | if (err) | |
714 | iser_err("Failed to disconnect, conn: 0x%p err %d\n", | |
715 | iser_conn, err); | |
716 | ||
ff3dd52d SG |
717 | /* post an indication that all flush errors were consumed */ |
718 | err = ib_post_send(ib_conn->qp, &ib_conn->beacon, &bad_wr); | |
16df2a26 | 719 | if (err) { |
ff3dd52d | 720 | iser_err("conn %p failed to post beacon", ib_conn); |
16df2a26 SG |
721 | return 1; |
722 | } | |
ff3dd52d | 723 | |
6aabfa76 | 724 | wait_for_completion(&ib_conn->flush_comp); |
c47a3c9e | 725 | } |
1cfa0a75 | 726 | |
c47a3c9e | 727 | return 1; |
1cfa0a75 OG |
728 | } |
729 | ||
504130c0 AN |
730 | /** |
731 | * Called with state mutex held | |
732 | **/ | |
b73c3ada | 733 | static void iser_connect_error(struct rdma_cm_id *cma_id) |
1cfa0a75 | 734 | { |
5716af6e | 735 | struct iser_conn *iser_conn; |
b73c3ada | 736 | |
5716af6e | 737 | iser_conn = (struct iser_conn *)cma_id->context; |
c4de4663 | 738 | iser_conn->state = ISER_CONN_TERMINATING; |
1cfa0a75 OG |
739 | } |
740 | ||
504130c0 AN |
741 | /** |
742 | * Called with state mutex held | |
743 | **/ | |
b73c3ada | 744 | static void iser_addr_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
745 | { |
746 | struct iser_device *device; | |
5716af6e | 747 | struct iser_conn *iser_conn; |
a4ee3539 | 748 | struct ib_conn *ib_conn; |
1cfa0a75 OG |
749 | int ret; |
750 | ||
5716af6e SG |
751 | iser_conn = (struct iser_conn *)cma_id->context; |
752 | if (iser_conn->state != ISER_CONN_PENDING) | |
504130c0 AN |
753 | /* bailout */ |
754 | return; | |
755 | ||
a4ee3539 | 756 | ib_conn = &iser_conn->ib_conn; |
1cfa0a75 | 757 | device = iser_device_find_by_ib_device(cma_id); |
d33ed425 AR |
758 | if (!device) { |
759 | iser_err("device lookup/creation failed\n"); | |
b73c3ada AN |
760 | iser_connect_error(cma_id); |
761 | return; | |
d33ed425 AR |
762 | } |
763 | ||
a4ee3539 | 764 | ib_conn->device = device; |
1cfa0a75 | 765 | |
7f733847 AT |
766 | /* connection T10-PI support */ |
767 | if (iser_pi_enable) { | |
768 | if (!(device->dev_attr.device_cap_flags & | |
769 | IB_DEVICE_SIGNATURE_HANDOVER)) { | |
770 | iser_warn("T10-PI requested but not supported on %s, " | |
771 | "continue without T10-PI\n", | |
a4ee3539 SG |
772 | ib_conn->device->ib_device->name); |
773 | ib_conn->pi_support = false; | |
7f733847 | 774 | } else { |
a4ee3539 | 775 | ib_conn->pi_support = true; |
7f733847 AT |
776 | } |
777 | } | |
778 | ||
1cfa0a75 OG |
779 | ret = rdma_resolve_route(cma_id, 1000); |
780 | if (ret) { | |
781 | iser_err("resolve route failed: %d\n", ret); | |
b73c3ada AN |
782 | iser_connect_error(cma_id); |
783 | return; | |
1cfa0a75 | 784 | } |
1cfa0a75 OG |
785 | } |
786 | ||
504130c0 AN |
787 | /** |
788 | * Called with state mutex held | |
789 | **/ | |
b73c3ada | 790 | static void iser_route_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 OG |
791 | { |
792 | struct rdma_conn_param conn_param; | |
793 | int ret; | |
8d8399de | 794 | struct iser_cm_hdr req_hdr; |
5716af6e | 795 | struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; |
a4ee3539 SG |
796 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
797 | struct iser_device *device = ib_conn->device; | |
1cfa0a75 | 798 | |
5716af6e | 799 | if (iser_conn->state != ISER_CONN_PENDING) |
504130c0 AN |
800 | /* bailout */ |
801 | return; | |
802 | ||
a4ee3539 | 803 | ret = iser_create_ib_conn_res(ib_conn); |
1cfa0a75 OG |
804 | if (ret) |
805 | goto failure; | |
806 | ||
1cfa0a75 | 807 | memset(&conn_param, 0, sizeof conn_param); |
2ea32938 | 808 | conn_param.responder_resources = device->dev_attr.max_qp_rd_atom; |
1cfa0a75 OG |
809 | conn_param.initiator_depth = 1; |
810 | conn_param.retry_count = 7; | |
811 | conn_param.rnr_retry_count = 6; | |
812 | ||
8d8399de OG |
813 | memset(&req_hdr, 0, sizeof(req_hdr)); |
814 | req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED | | |
815 | ISER_SEND_W_INV_NOT_SUPPORTED); | |
816 | conn_param.private_data = (void *)&req_hdr; | |
817 | conn_param.private_data_len = sizeof(struct iser_cm_hdr); | |
818 | ||
1cfa0a75 OG |
819 | ret = rdma_connect(cma_id, &conn_param); |
820 | if (ret) { | |
821 | iser_err("failure connecting: %d\n", ret); | |
822 | goto failure; | |
823 | } | |
824 | ||
b73c3ada | 825 | return; |
1cfa0a75 | 826 | failure: |
b73c3ada | 827 | iser_connect_error(cma_id); |
1cfa0a75 OG |
828 | } |
829 | ||
830 | static void iser_connected_handler(struct rdma_cm_id *cma_id) | |
831 | { | |
5716af6e | 832 | struct iser_conn *iser_conn; |
4f9208ad OG |
833 | struct ib_qp_attr attr; |
834 | struct ib_qp_init_attr init_attr; | |
835 | ||
5716af6e SG |
836 | iser_conn = (struct iser_conn *)cma_id->context; |
837 | if (iser_conn->state != ISER_CONN_PENDING) | |
504130c0 AN |
838 | /* bailout */ |
839 | return; | |
840 | ||
4f9208ad OG |
841 | (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); |
842 | iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); | |
1cfa0a75 | 843 | |
5716af6e SG |
844 | iser_conn->state = ISER_CONN_UP; |
845 | complete(&iser_conn->up_completion); | |
1cfa0a75 OG |
846 | } |
847 | ||
b73c3ada | 848 | static void iser_disconnected_handler(struct rdma_cm_id *cma_id) |
1cfa0a75 | 849 | { |
c47a3c9e | 850 | struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; |
1cfa0a75 | 851 | |
c47a3c9e | 852 | if (iser_conn_terminate(iser_conn)) { |
5716af6e | 853 | if (iser_conn->iscsi_conn) |
c47a3c9e SG |
854 | iscsi_conn_failure(iser_conn->iscsi_conn, |
855 | ISCSI_ERR_CONN_FAILED); | |
7d9eacf9 RD |
856 | else |
857 | iser_err("iscsi_iser connection isn't bound\n"); | |
858 | } | |
c47a3c9e SG |
859 | } |
860 | ||
861 | static void iser_cleanup_handler(struct rdma_cm_id *cma_id, | |
6606e6a2 | 862 | bool destroy) |
c47a3c9e SG |
863 | { |
864 | struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; | |
1cfa0a75 | 865 | |
c47a3c9e SG |
866 | /* |
867 | * We are not guaranteed that we visited disconnected_handler | |
868 | * by now, call it here to be safe that we handle CM drep | |
869 | * and flush errors. | |
8d4aca7f | 870 | */ |
c47a3c9e | 871 | iser_disconnected_handler(cma_id); |
6606e6a2 | 872 | iser_free_ib_conn_res(iser_conn, destroy); |
c47a3c9e SG |
873 | complete(&iser_conn->ib_completion); |
874 | }; | |
1cfa0a75 OG |
875 | |
876 | static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) | |
877 | { | |
5716af6e | 878 | struct iser_conn *iser_conn; |
c47a3c9e | 879 | int ret = 0; |
504130c0 | 880 | |
5716af6e | 881 | iser_conn = (struct iser_conn *)cma_id->context; |
871e00af SG |
882 | iser_info("%s (%d): status %d conn %p id %p\n", |
883 | rdma_event_msg(event->event), event->event, | |
884 | event->status, cma_id->context, cma_id); | |
1cfa0a75 | 885 | |
5716af6e | 886 | mutex_lock(&iser_conn->state_mutex); |
1cfa0a75 OG |
887 | switch (event->event) { |
888 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
b73c3ada | 889 | iser_addr_handler(cma_id); |
1cfa0a75 OG |
890 | break; |
891 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
b73c3ada | 892 | iser_route_handler(cma_id); |
1cfa0a75 OG |
893 | break; |
894 | case RDMA_CM_EVENT_ESTABLISHED: | |
895 | iser_connected_handler(cma_id); | |
896 | break; | |
897 | case RDMA_CM_EVENT_ADDR_ERROR: | |
898 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
899 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
900 | case RDMA_CM_EVENT_UNREACHABLE: | |
901 | case RDMA_CM_EVENT_REJECTED: | |
b73c3ada | 902 | iser_connect_error(cma_id); |
1cfa0a75 OG |
903 | break; |
904 | case RDMA_CM_EVENT_DISCONNECTED: | |
2f5de151 | 905 | case RDMA_CM_EVENT_ADDR_CHANGE: |
5426b171 AN |
906 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
907 | iser_cleanup_handler(cma_id, false); | |
1cfa0a75 | 908 | break; |
c47a3c9e SG |
909 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
910 | /* | |
911 | * we *must* destroy the device as we cannot rely | |
912 | * on iscsid to be around to initiate error handling. | |
5426b171 AN |
913 | * also if we are not in state DOWN implicitly destroy |
914 | * the cma_id. | |
c47a3c9e SG |
915 | */ |
916 | iser_cleanup_handler(cma_id, true); | |
5426b171 AN |
917 | if (iser_conn->state != ISER_CONN_DOWN) { |
918 | iser_conn->ib_conn.cma_id = NULL; | |
919 | ret = 1; | |
920 | } | |
c47a3c9e | 921 | break; |
1cfa0a75 | 922 | default: |
871e00af SG |
923 | iser_err("Unexpected RDMA CM event: %s (%d)\n", |
924 | rdma_event_msg(event->event), event->event); | |
1cfa0a75 OG |
925 | break; |
926 | } | |
5716af6e | 927 | mutex_unlock(&iser_conn->state_mutex); |
c47a3c9e SG |
928 | |
929 | return ret; | |
1cfa0a75 OG |
930 | } |
931 | ||
5716af6e | 932 | void iser_conn_init(struct iser_conn *iser_conn) |
1cfa0a75 | 933 | { |
5716af6e | 934 | iser_conn->state = ISER_CONN_INIT; |
a4ee3539 | 935 | iser_conn->ib_conn.post_recv_buf_count = 0; |
6aabfa76 | 936 | init_completion(&iser_conn->ib_conn.flush_comp); |
5716af6e | 937 | init_completion(&iser_conn->stop_completion); |
c47a3c9e | 938 | init_completion(&iser_conn->ib_completion); |
5716af6e SG |
939 | init_completion(&iser_conn->up_completion); |
940 | INIT_LIST_HEAD(&iser_conn->conn_list); | |
a4ee3539 | 941 | spin_lock_init(&iser_conn->ib_conn.lock); |
5716af6e | 942 | mutex_init(&iser_conn->state_mutex); |
1cfa0a75 OG |
943 | } |
944 | ||
945 | /** | |
946 | * starts the process of connecting to the target | |
94e2bd68 | 947 | * sleeps until the connection is established or rejected |
1cfa0a75 | 948 | */ |
5716af6e | 949 | int iser_connect(struct iser_conn *iser_conn, |
96ed02d4 RD |
950 | struct sockaddr *src_addr, |
951 | struct sockaddr *dst_addr, | |
1cfa0a75 OG |
952 | int non_blocking) |
953 | { | |
a4ee3539 | 954 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
1cfa0a75 OG |
955 | int err = 0; |
956 | ||
5716af6e | 957 | mutex_lock(&iser_conn->state_mutex); |
504130c0 | 958 | |
5716af6e | 959 | sprintf(iser_conn->name, "%pISp", dst_addr); |
96ed02d4 | 960 | |
5716af6e | 961 | iser_info("connecting to: %s\n", iser_conn->name); |
1cfa0a75 OG |
962 | |
963 | /* the device is known only --after-- address resolution */ | |
a4ee3539 | 964 | ib_conn->device = NULL; |
1cfa0a75 | 965 | |
5716af6e | 966 | iser_conn->state = ISER_CONN_PENDING; |
1cfa0a75 | 967 | |
ff3dd52d SG |
968 | ib_conn->beacon.wr_id = ISER_BEACON_WRID; |
969 | ib_conn->beacon.opcode = IB_WR_SEND; | |
970 | ||
a4ee3539 SG |
971 | ib_conn->cma_id = rdma_create_id(iser_cma_handler, |
972 | (void *)iser_conn, | |
973 | RDMA_PS_TCP, IB_QPT_RC); | |
974 | if (IS_ERR(ib_conn->cma_id)) { | |
975 | err = PTR_ERR(ib_conn->cma_id); | |
1cfa0a75 OG |
976 | iser_err("rdma_create_id failed: %d\n", err); |
977 | goto id_failure; | |
978 | } | |
979 | ||
a4ee3539 | 980 | err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); |
1cfa0a75 OG |
981 | if (err) { |
982 | iser_err("rdma_resolve_addr failed: %d\n", err); | |
983 | goto addr_failure; | |
984 | } | |
985 | ||
986 | if (!non_blocking) { | |
5716af6e | 987 | wait_for_completion_interruptible(&iser_conn->up_completion); |
1cfa0a75 | 988 | |
5716af6e | 989 | if (iser_conn->state != ISER_CONN_UP) { |
1cfa0a75 OG |
990 | err = -EIO; |
991 | goto connect_failure; | |
992 | } | |
993 | } | |
5716af6e | 994 | mutex_unlock(&iser_conn->state_mutex); |
1cfa0a75 OG |
995 | |
996 | mutex_lock(&ig.connlist_mutex); | |
5716af6e | 997 | list_add(&iser_conn->conn_list, &ig.connlist); |
1cfa0a75 OG |
998 | mutex_unlock(&ig.connlist_mutex); |
999 | return 0; | |
1000 | ||
1001 | id_failure: | |
a4ee3539 | 1002 | ib_conn->cma_id = NULL; |
1cfa0a75 | 1003 | addr_failure: |
5716af6e | 1004 | iser_conn->state = ISER_CONN_DOWN; |
1cfa0a75 | 1005 | connect_failure: |
5716af6e SG |
1006 | mutex_unlock(&iser_conn->state_mutex); |
1007 | iser_conn_release(iser_conn); | |
1cfa0a75 OG |
1008 | return err; |
1009 | } | |
1010 | ||
5716af6e | 1011 | int iser_post_recvl(struct iser_conn *iser_conn) |
bcc60c38 OG |
1012 | { |
1013 | struct ib_recv_wr rx_wr, *rx_wr_failed; | |
a4ee3539 | 1014 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
bcc60c38 OG |
1015 | struct ib_sge sge; |
1016 | int ib_ret; | |
1017 | ||
5716af6e | 1018 | sge.addr = iser_conn->login_resp_dma; |
bcc60c38 | 1019 | sge.length = ISER_RX_LOGIN_SIZE; |
a4ee3539 | 1020 | sge.lkey = ib_conn->device->mr->lkey; |
bcc60c38 | 1021 | |
49df2781 | 1022 | rx_wr.wr_id = (uintptr_t)iser_conn->login_resp_buf; |
bcc60c38 OG |
1023 | rx_wr.sg_list = &sge; |
1024 | rx_wr.num_sge = 1; | |
1025 | rx_wr.next = NULL; | |
1026 | ||
a4ee3539 SG |
1027 | ib_conn->post_recv_buf_count++; |
1028 | ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); | |
bcc60c38 OG |
1029 | if (ib_ret) { |
1030 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
a4ee3539 | 1031 | ib_conn->post_recv_buf_count--; |
bcc60c38 OG |
1032 | } |
1033 | return ib_ret; | |
1034 | } | |
1035 | ||
5716af6e | 1036 | int iser_post_recvm(struct iser_conn *iser_conn, int count) |
bcc60c38 OG |
1037 | { |
1038 | struct ib_recv_wr *rx_wr, *rx_wr_failed; | |
1039 | int i, ib_ret; | |
a4ee3539 | 1040 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
5716af6e | 1041 | unsigned int my_rx_head = iser_conn->rx_desc_head; |
bcc60c38 OG |
1042 | struct iser_rx_desc *rx_desc; |
1043 | ||
a4ee3539 | 1044 | for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { |
5716af6e | 1045 | rx_desc = &iser_conn->rx_descs[my_rx_head]; |
49df2781 | 1046 | rx_wr->wr_id = (uintptr_t)rx_desc; |
bcc60c38 OG |
1047 | rx_wr->sg_list = &rx_desc->rx_sg; |
1048 | rx_wr->num_sge = 1; | |
1049 | rx_wr->next = rx_wr + 1; | |
5716af6e | 1050 | my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; |
bcc60c38 OG |
1051 | } |
1052 | ||
1053 | rx_wr--; | |
1054 | rx_wr->next = NULL; /* mark end of work requests list */ | |
1055 | ||
a4ee3539 SG |
1056 | ib_conn->post_recv_buf_count += count; |
1057 | ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); | |
bcc60c38 OG |
1058 | if (ib_ret) { |
1059 | iser_err("ib_post_recv failed ret=%d\n", ib_ret); | |
a4ee3539 | 1060 | ib_conn->post_recv_buf_count -= count; |
bcc60c38 | 1061 | } else |
5716af6e | 1062 | iser_conn->rx_desc_head = my_rx_head; |
bcc60c38 OG |
1063 | return ib_ret; |
1064 | } | |
1065 | ||
1066 | ||
1cfa0a75 OG |
1067 | /** |
1068 | * iser_start_send - Initiate a Send DTO operation | |
1069 | * | |
1070 | * returns 0 on success, -1 on failure | |
1071 | */ | |
6df5a128 SG |
1072 | int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
1073 | bool signal) | |
1cfa0a75 | 1074 | { |
f19624aa | 1075 | int ib_ret; |
1cfa0a75 | 1076 | struct ib_send_wr send_wr, *send_wr_failed; |
1cfa0a75 | 1077 | |
a4ee3539 | 1078 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
5716af6e SG |
1079 | tx_desc->dma_addr, ISER_HEADERS_LEN, |
1080 | DMA_TO_DEVICE); | |
1cfa0a75 OG |
1081 | |
1082 | send_wr.next = NULL; | |
49df2781 | 1083 | send_wr.wr_id = (uintptr_t)tx_desc; |
f19624aa OG |
1084 | send_wr.sg_list = tx_desc->tx_sg; |
1085 | send_wr.num_sge = tx_desc->num_sge; | |
1cfa0a75 | 1086 | send_wr.opcode = IB_WR_SEND; |
6df5a128 | 1087 | send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0; |
1cfa0a75 | 1088 | |
a4ee3539 | 1089 | ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); |
ff3dd52d | 1090 | if (ib_ret) |
1cfa0a75 | 1091 | iser_err("ib_post_send failed, ret:%d\n", ib_ret); |
ff3dd52d | 1092 | |
f19624aa | 1093 | return ib_ret; |
1cfa0a75 OG |
1094 | } |
1095 | ||
6aabfa76 SG |
1096 | /** |
1097 | * is_iser_tx_desc - Indicate if the completion wr_id | |
1098 | * is a TX descriptor or not. | |
1099 | * @iser_conn: iser connection | |
1100 | * @wr_id: completion WR identifier | |
1101 | * | |
1102 | * Since we cannot rely on wc opcode in FLUSH errors | |
1103 | * we must work around it by checking if the wr_id address | |
1104 | * falls in the iser connection rx_descs buffer. If so | |
1105 | * it is an RX descriptor, otherwize it is a TX. | |
1106 | */ | |
1107 | static inline bool | |
1108 | is_iser_tx_desc(struct iser_conn *iser_conn, void *wr_id) | |
1109 | { | |
1110 | void *start = iser_conn->rx_descs; | |
1111 | int len = iser_conn->num_rx_descs * sizeof(*iser_conn->rx_descs); | |
1112 | ||
1113 | if (wr_id >= start && wr_id < start + len) | |
1114 | return false; | |
1115 | ||
1116 | return true; | |
1117 | } | |
1118 | ||
8c204e69 SG |
1119 | /** |
1120 | * iser_handle_comp_error() - Handle error completion | |
8c204e69 SG |
1121 | * @ib_conn: connection RDMA resources |
1122 | * @wc: work completion | |
1123 | * | |
1124 | * Notes: We may handle a FLUSH error completion and in this case | |
1125 | * we only cleanup in case TX type was DATAOUT. For non-FLUSH | |
1126 | * error completion we should also notify iscsi layer that | |
1127 | * connection is failed (in case we passed bind stage). | |
1128 | */ | |
1129 | static void | |
6aabfa76 | 1130 | iser_handle_comp_error(struct ib_conn *ib_conn, |
8c204e69 | 1131 | struct ib_wc *wc) |
1cfa0a75 | 1132 | { |
49df2781 | 1133 | void *wr_id = (void *)(uintptr_t)wc->wr_id; |
8c204e69 SG |
1134 | struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, |
1135 | ib_conn); | |
1136 | ||
1137 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
1138 | if (iser_conn->iscsi_conn) | |
1139 | iscsi_conn_failure(iser_conn->iscsi_conn, | |
1140 | ISCSI_ERR_CONN_FAILED); | |
1141 | ||
30bf1d58 SG |
1142 | if (wc->wr_id == ISER_FASTREG_LI_WRID) |
1143 | return; | |
1144 | ||
49df2781 SG |
1145 | if (is_iser_tx_desc(iser_conn, wr_id)) { |
1146 | struct iser_tx_desc *desc = wr_id; | |
6aabfa76 | 1147 | |
6aabfa76 SG |
1148 | if (desc->type == ISCSI_TX_DATAOUT) |
1149 | kmem_cache_free(ig.desc_cache, desc); | |
1150 | } else { | |
1151 | ib_conn->post_recv_buf_count--; | |
1152 | } | |
1cfa0a75 OG |
1153 | } |
1154 | ||
6aabfa76 SG |
1155 | /** |
1156 | * iser_handle_wc - handle a single work completion | |
1157 | * @wc: work completion | |
1158 | * | |
1159 | * Soft-IRQ context, work completion can be either | |
1160 | * SEND or RECV, and can turn out successful or | |
1161 | * with error (or flush error). | |
1162 | */ | |
1163 | static void iser_handle_wc(struct ib_wc *wc) | |
78ad0a34 | 1164 | { |
a4ee3539 | 1165 | struct ib_conn *ib_conn; |
6aabfa76 SG |
1166 | struct iser_tx_desc *tx_desc; |
1167 | struct iser_rx_desc *rx_desc; | |
78ad0a34 | 1168 | |
6aabfa76 | 1169 | ib_conn = wc->qp->qp_context; |
06c7fb67 | 1170 | if (likely(wc->status == IB_WC_SUCCESS)) { |
6aabfa76 | 1171 | if (wc->opcode == IB_WC_RECV) { |
49df2781 | 1172 | rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; |
6aabfa76 SG |
1173 | iser_rcv_completion(rx_desc, wc->byte_len, |
1174 | ib_conn); | |
1175 | } else | |
1176 | if (wc->opcode == IB_WC_SEND) { | |
49df2781 | 1177 | tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; |
6aabfa76 | 1178 | iser_snd_completion(tx_desc, ib_conn); |
78ad0a34 | 1179 | } else { |
6aabfa76 | 1180 | iser_err("Unknown wc opcode %d\n", wc->opcode); |
78ad0a34 | 1181 | } |
6aabfa76 SG |
1182 | } else { |
1183 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
871e00af SG |
1184 | iser_err("%s (%d): wr id %llx vend_err %x\n", |
1185 | ib_wc_status_msg(wc->status), wc->status, | |
1186 | wc->wr_id, wc->vendor_err); | |
6aabfa76 | 1187 | else |
871e00af SG |
1188 | iser_dbg("%s (%d): wr id %llx\n", |
1189 | ib_wc_status_msg(wc->status), wc->status, | |
1190 | wc->wr_id); | |
6aabfa76 | 1191 | |
ff3dd52d | 1192 | if (wc->wr_id == ISER_BEACON_WRID) |
30bf1d58 | 1193 | /* all flush errors were consumed */ |
6aabfa76 | 1194 | complete(&ib_conn->flush_comp); |
30bf1d58 SG |
1195 | else |
1196 | iser_handle_comp_error(ib_conn, wc); | |
78ad0a34 | 1197 | } |
78ad0a34 OG |
1198 | } |
1199 | ||
6aabfa76 SG |
1200 | /** |
1201 | * iser_cq_tasklet_fn - iSER completion polling loop | |
1202 | * @data: iSER completion context | |
1203 | * | |
1204 | * Soft-IRQ context, polling connection CQ until | |
1205 | * either CQ was empty or we exausted polling budget | |
1206 | */ | |
1cfa0a75 OG |
1207 | static void iser_cq_tasklet_fn(unsigned long data) |
1208 | { | |
bf175540 | 1209 | struct iser_comp *comp = (struct iser_comp *)data; |
6aabfa76 | 1210 | struct ib_cq *cq = comp->cq; |
6e6fe2fb SG |
1211 | struct ib_wc *const wcs = comp->wcs; |
1212 | int i, n, completed = 0; | |
1cfa0a75 | 1213 | |
6e6fe2fb SG |
1214 | while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { |
1215 | for (i = 0; i < n; i++) | |
1216 | iser_handle_wc(&wcs[i]); | |
6aabfa76 | 1217 | |
6e6fe2fb SG |
1218 | completed += n; |
1219 | if (completed >= iser_cq_poll_limit) | |
183cfa43 | 1220 | break; |
1cfa0a75 | 1221 | } |
6aabfa76 SG |
1222 | |
1223 | /* | |
1224 | * It is assumed here that arming CQ only once its empty | |
1225 | * would not cause interrupts to be missed. | |
1226 | */ | |
1cfa0a75 | 1227 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); |
78ad0a34 | 1228 | |
6aabfa76 | 1229 | iser_dbg("got %d completions\n", completed); |
1cfa0a75 OG |
1230 | } |
1231 | ||
1232 | static void iser_cq_callback(struct ib_cq *cq, void *cq_context) | |
1233 | { | |
bf175540 | 1234 | struct iser_comp *comp = cq_context; |
1cfa0a75 | 1235 | |
bf175540 | 1236 | tasklet_schedule(&comp->tasklet); |
1cfa0a75 | 1237 | } |
0a7a08ad SG |
1238 | |
1239 | u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, | |
1240 | enum iser_data_dir cmd_dir, sector_t *sector) | |
1241 | { | |
b130eded | 1242 | struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; |
0a7a08ad SG |
1243 | struct fast_reg_descriptor *desc = reg->mem_h; |
1244 | unsigned long sector_size = iser_task->sc->device->sector_size; | |
1245 | struct ib_mr_status mr_status; | |
1246 | int ret; | |
1247 | ||
1248 | if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) { | |
1249 | desc->reg_indicators &= ~ISER_FASTREG_PROTECTED; | |
1250 | ret = ib_check_mr_status(desc->pi_ctx->sig_mr, | |
1251 | IB_MR_CHECK_SIG_STATUS, &mr_status); | |
1252 | if (ret) { | |
1253 | pr_err("ib_check_mr_status failed, ret %d\n", ret); | |
1254 | goto err; | |
1255 | } | |
1256 | ||
1257 | if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { | |
1258 | sector_t sector_off = mr_status.sig_err.sig_err_offset; | |
1259 | ||
1260 | do_div(sector_off, sector_size + 8); | |
1261 | *sector = scsi_get_lba(iser_task->sc) + sector_off; | |
1262 | ||
39c978cd | 1263 | pr_err("PI error found type %d at sector %llx " |
0a7a08ad | 1264 | "expected %x vs actual %x\n", |
39c978cd RD |
1265 | mr_status.sig_err.err_type, |
1266 | (unsigned long long)*sector, | |
0a7a08ad SG |
1267 | mr_status.sig_err.expected, |
1268 | mr_status.sig_err.actual); | |
1269 | ||
1270 | switch (mr_status.sig_err.err_type) { | |
1271 | case IB_SIG_BAD_GUARD: | |
1272 | return 0x1; | |
1273 | case IB_SIG_BAD_REFTAG: | |
1274 | return 0x3; | |
1275 | case IB_SIG_BAD_APPTAG: | |
1276 | return 0x2; | |
1277 | } | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | return 0; | |
1282 | err: | |
1283 | /* Not alot we can do here, return ambiguous guard error */ | |
1284 | return 0x1; | |
1285 | } |