1 /*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/mm.h>
36 #include <linux/scatterlist.h>
37 #include <linux/kfifo.h>
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_host.h>
40
41 #include "iscsi_iser.h"
42
43 /* Register user buffer memory and initialize passive rdma
44 * dto descriptor. Data size is stored in
45 * task->data[ISER_DIR_IN].data_len, Protection size
46 * os stored in task->prot[ISER_DIR_IN].data_len
47 */
iser_prepare_read_cmd(struct iscsi_task * task)48 static int iser_prepare_read_cmd(struct iscsi_task *task)
49
50 {
51 struct iscsi_iser_task *iser_task = task->dd_data;
52 struct iser_mem_reg *mem_reg;
53 int err;
54 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
55
56 err = iser_dma_map_task_data(iser_task,
57 ISER_DIR_IN,
58 DMA_FROM_DEVICE);
59 if (err)
60 return err;
61
62 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false);
63 if (err) {
64 iser_err("Failed to set up Data-IN RDMA\n");
65 goto out_err;
66 }
67 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
68
69 hdr->flags |= ISER_RSV;
70 hdr->read_stag = cpu_to_be32(mem_reg->rkey);
71 hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
72
73 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
74 task->itt, mem_reg->rkey,
75 (unsigned long long)mem_reg->sge.addr);
76
77 return 0;
78
79 out_err:
80 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN, DMA_FROM_DEVICE);
81 return err;
82 }
83
84 /* Register user buffer memory and initialize passive rdma
85 * dto descriptor. Data size is stored in
86 * task->data[ISER_DIR_OUT].data_len, Protection size
87 * is stored at task->prot[ISER_DIR_OUT].data_len
88 */
iser_prepare_write_cmd(struct iscsi_task * task,unsigned int imm_sz,unsigned int unsol_sz,unsigned int edtl)89 static int iser_prepare_write_cmd(struct iscsi_task *task, unsigned int imm_sz,
90 unsigned int unsol_sz, unsigned int edtl)
91 {
92 struct iscsi_iser_task *iser_task = task->dd_data;
93 struct iser_mem_reg *mem_reg;
94 int err;
95 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
96 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
97 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
98
99 err = iser_dma_map_task_data(iser_task,
100 ISER_DIR_OUT,
101 DMA_TO_DEVICE);
102 if (err)
103 return err;
104
105 err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT,
106 buf_out->data_len == imm_sz);
107 if (err) {
108 iser_err("Failed to register write cmd RDMA mem\n");
109 goto out_err;
110 }
111
112 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
113
114 if (unsol_sz < edtl) {
115 hdr->flags |= ISER_WSV;
116 if (buf_out->data_len > imm_sz) {
117 hdr->write_stag = cpu_to_be32(mem_reg->rkey);
118 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
119 }
120
121 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
122 task->itt, mem_reg->rkey,
123 (unsigned long long)mem_reg->sge.addr, unsol_sz);
124 }
125
126 if (imm_sz > 0) {
127 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
128 task->itt, imm_sz);
129 tx_dsg->addr = mem_reg->sge.addr;
130 tx_dsg->length = imm_sz;
131 tx_dsg->lkey = mem_reg->sge.lkey;
132 iser_task->desc.num_sge = 2;
133 }
134
135 return 0;
136
137 out_err:
138 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT, DMA_TO_DEVICE);
139 return err;
140 }
141
142 /* creates a new tx descriptor and adds header regd buffer */
iser_create_send_desc(struct iser_conn * iser_conn,struct iser_tx_desc * tx_desc)143 static void iser_create_send_desc(struct iser_conn *iser_conn,
144 struct iser_tx_desc *tx_desc)
145 {
146 struct iser_device *device = iser_conn->ib_conn.device;
147
148 ib_dma_sync_single_for_cpu(device->ib_device,
149 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
150
151 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
152 tx_desc->iser_header.flags = ISER_VER;
153 tx_desc->num_sge = 1;
154 }
155
iser_free_login_buf(struct iser_conn * iser_conn)156 static void iser_free_login_buf(struct iser_conn *iser_conn)
157 {
158 struct iser_device *device = iser_conn->ib_conn.device;
159 struct iser_login_desc *desc = &iser_conn->login_desc;
160
161 if (!desc->req)
162 return;
163
164 ib_dma_unmap_single(device->ib_device, desc->req_dma,
165 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
166
167 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
168 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
169
170 kfree(desc->req);
171 kfree(desc->rsp);
172
173 /* make sure we never redo any unmapping */
174 desc->req = NULL;
175 desc->rsp = NULL;
176 }
177
iser_alloc_login_buf(struct iser_conn * iser_conn)178 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
179 {
180 struct iser_device *device = iser_conn->ib_conn.device;
181 struct iser_login_desc *desc = &iser_conn->login_desc;
182
183 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
184 if (!desc->req)
185 return -ENOMEM;
186
187 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
188 ISCSI_DEF_MAX_RECV_SEG_LEN,
189 DMA_TO_DEVICE);
190 if (ib_dma_mapping_error(device->ib_device,
191 desc->req_dma))
192 goto free_req;
193
194 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
195 if (!desc->rsp)
196 goto unmap_req;
197
198 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
199 ISER_RX_LOGIN_SIZE,
200 DMA_FROM_DEVICE);
201 if (ib_dma_mapping_error(device->ib_device,
202 desc->rsp_dma))
203 goto free_rsp;
204
205 return 0;
206
207 free_rsp:
208 kfree(desc->rsp);
209 unmap_req:
210 ib_dma_unmap_single(device->ib_device, desc->req_dma,
211 ISCSI_DEF_MAX_RECV_SEG_LEN,
212 DMA_TO_DEVICE);
213 free_req:
214 kfree(desc->req);
215
216 return -ENOMEM;
217 }
218
iser_alloc_rx_descriptors(struct iser_conn * iser_conn,struct iscsi_session * session)219 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
220 struct iscsi_session *session)
221 {
222 int i, j;
223 u64 dma_addr;
224 struct iser_rx_desc *rx_desc;
225 struct ib_sge *rx_sg;
226 struct ib_conn *ib_conn = &iser_conn->ib_conn;
227 struct iser_device *device = ib_conn->device;
228
229 iser_conn->qp_max_recv_dtos = session->cmds_max;
230
231 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
232 iser_conn->pages_per_mr))
233 goto create_rdma_reg_res_failed;
234
235 if (iser_alloc_login_buf(iser_conn))
236 goto alloc_login_buf_fail;
237
238 iser_conn->num_rx_descs = session->cmds_max;
239 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
240 sizeof(struct iser_rx_desc),
241 GFP_KERNEL);
242 if (!iser_conn->rx_descs)
243 goto rx_desc_alloc_fail;
244
245 rx_desc = iser_conn->rx_descs;
246
247 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
248 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
249 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
250 if (ib_dma_mapping_error(device->ib_device, dma_addr))
251 goto rx_desc_dma_map_failed;
252
253 rx_desc->dma_addr = dma_addr;
254 rx_desc->cqe.done = iser_task_rsp;
255 rx_sg = &rx_desc->rx_sg;
256 rx_sg->addr = rx_desc->dma_addr;
257 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
258 rx_sg->lkey = device->pd->local_dma_lkey;
259 }
260
261 return 0;
262
263 rx_desc_dma_map_failed:
264 rx_desc = iser_conn->rx_descs;
265 for (j = 0; j < i; j++, rx_desc++)
266 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
267 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
268 kfree(iser_conn->rx_descs);
269 iser_conn->rx_descs = NULL;
270 rx_desc_alloc_fail:
271 iser_free_login_buf(iser_conn);
272 alloc_login_buf_fail:
273 iser_free_fastreg_pool(ib_conn);
274 create_rdma_reg_res_failed:
275 iser_err("failed allocating rx descriptors / data buffers\n");
276 return -ENOMEM;
277 }
278
iser_free_rx_descriptors(struct iser_conn * iser_conn)279 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
280 {
281 int i;
282 struct iser_rx_desc *rx_desc;
283 struct ib_conn *ib_conn = &iser_conn->ib_conn;
284 struct iser_device *device = ib_conn->device;
285
286 iser_free_fastreg_pool(ib_conn);
287
288 rx_desc = iser_conn->rx_descs;
289 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
290 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
291 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
292 kfree(iser_conn->rx_descs);
293 /* make sure we never redo any unmapping */
294 iser_conn->rx_descs = NULL;
295
296 iser_free_login_buf(iser_conn);
297 }
298
iser_post_rx_bufs(struct iscsi_conn * conn,struct iscsi_hdr * req)299 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
300 {
301 struct iser_conn *iser_conn = conn->dd_data;
302 struct iscsi_session *session = conn->session;
303 int err = 0;
304 int i;
305
306 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
307 /* check if this is the last login - going to full feature phase */
308 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
309 goto out;
310
311 if (session->discovery_sess) {
312 iser_info("Discovery session, re-using login RX buffer\n");
313 goto out;
314 }
315
316 iser_info("Normal session, posting batch of RX %d buffers\n",
317 iser_conn->qp_max_recv_dtos - 1);
318
319 /*
320 * Initial post receive buffers.
321 * There is one already posted recv buffer (for the last login
322 * response). Therefore, the first recv buffer is skipped here.
323 */
324 for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
325 err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
326 if (err)
327 goto out;
328 }
329 out:
330 return err;
331 }
332
333 /**
334 * iser_send_command - send command PDU
335 * @conn: link to matching iscsi connection
336 * @task: SCSI command task
337 */
iser_send_command(struct iscsi_conn * conn,struct iscsi_task * task)338 int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
339 {
340 struct iser_conn *iser_conn = conn->dd_data;
341 struct iscsi_iser_task *iser_task = task->dd_data;
342 unsigned long edtl;
343 int err;
344 struct iser_data_buf *data_buf, *prot_buf;
345 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
346 struct scsi_cmnd *sc = task->sc;
347 struct iser_tx_desc *tx_desc = &iser_task->desc;
348
349 edtl = ntohl(hdr->data_length);
350
351 /* build the tx desc regd header and add it to the tx desc dto */
352 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
353 tx_desc->cqe.done = iser_cmd_comp;
354 iser_create_send_desc(iser_conn, tx_desc);
355
356 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
357 data_buf = &iser_task->data[ISER_DIR_IN];
358 prot_buf = &iser_task->prot[ISER_DIR_IN];
359 } else {
360 data_buf = &iser_task->data[ISER_DIR_OUT];
361 prot_buf = &iser_task->prot[ISER_DIR_OUT];
362 }
363
364 if (scsi_sg_count(sc)) { /* using a scatter list */
365 data_buf->sg = scsi_sglist(sc);
366 data_buf->size = scsi_sg_count(sc);
367 }
368 data_buf->data_len = scsi_bufflen(sc);
369
370 if (scsi_prot_sg_count(sc)) {
371 prot_buf->sg = scsi_prot_sglist(sc);
372 prot_buf->size = scsi_prot_sg_count(sc);
373 prot_buf->data_len = (data_buf->data_len >>
374 ilog2(sc->device->sector_size)) * 8;
375 }
376
377 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
378 err = iser_prepare_read_cmd(task);
379 if (err)
380 goto send_command_error;
381 }
382 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
383 err = iser_prepare_write_cmd(task,
384 task->imm_count,
385 task->imm_count +
386 task->unsol_r2t.data_length,
387 edtl);
388 if (err)
389 goto send_command_error;
390 }
391
392 iser_task->status = ISER_TASK_STATUS_STARTED;
393
394 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
395 if (!err)
396 return 0;
397
398 send_command_error:
399 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
400 return err;
401 }
402
403 /**
404 * iser_send_data_out - send data out PDU
405 * @conn: link to matching iscsi connection
406 * @task: SCSI command task
407 * @hdr: pointer to the LLD's iSCSI message header
408 */
iser_send_data_out(struct iscsi_conn * conn,struct iscsi_task * task,struct iscsi_data * hdr)409 int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
410 struct iscsi_data *hdr)
411 {
412 struct iser_conn *iser_conn = conn->dd_data;
413 struct iscsi_iser_task *iser_task = task->dd_data;
414 struct iser_tx_desc *tx_desc;
415 struct iser_mem_reg *mem_reg;
416 unsigned long buf_offset;
417 unsigned long data_seg_len;
418 uint32_t itt;
419 int err;
420 struct ib_sge *tx_dsg;
421
422 itt = (__force uint32_t)hdr->itt;
423 data_seg_len = ntoh24(hdr->dlength);
424 buf_offset = ntohl(hdr->offset);
425
426 iser_dbg("%s itt %d dseg_len %d offset %d\n",
427 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
428
429 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
430 if (!tx_desc)
431 return -ENOMEM;
432
433 tx_desc->type = ISCSI_TX_DATAOUT;
434 tx_desc->cqe.done = iser_dataout_comp;
435 tx_desc->iser_header.flags = ISER_VER;
436 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
437
438 /* build the tx desc */
439 err = iser_initialize_task_headers(task, tx_desc);
440 if (err)
441 goto send_data_out_error;
442
443 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
444 tx_dsg = &tx_desc->tx_sg[1];
445 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
446 tx_dsg->length = data_seg_len;
447 tx_dsg->lkey = mem_reg->sge.lkey;
448 tx_desc->num_sge = 2;
449
450 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
451 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
452 buf_offset, data_seg_len,
453 iser_task->data[ISER_DIR_OUT].data_len, itt);
454 err = -EINVAL;
455 goto send_data_out_error;
456 }
457 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
458 itt, buf_offset, data_seg_len);
459
460
461 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
462 if (!err)
463 return 0;
464
465 send_data_out_error:
466 kmem_cache_free(ig.desc_cache, tx_desc);
467 iser_err("conn %p failed err %d\n", conn, err);
468 return err;
469 }
470
iser_send_control(struct iscsi_conn * conn,struct iscsi_task * task)471 int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
472 {
473 struct iser_conn *iser_conn = conn->dd_data;
474 struct iscsi_iser_task *iser_task = task->dd_data;
475 struct iser_tx_desc *mdesc = &iser_task->desc;
476 unsigned long data_seg_len;
477 int err = 0;
478 struct iser_device *device;
479
480 /* build the tx desc regd header and add it to the tx desc dto */
481 mdesc->type = ISCSI_TX_CONTROL;
482 mdesc->cqe.done = iser_ctrl_comp;
483 iser_create_send_desc(iser_conn, mdesc);
484
485 device = iser_conn->ib_conn.device;
486
487 data_seg_len = ntoh24(task->hdr->dlength);
488
489 if (data_seg_len > 0) {
490 struct iser_login_desc *desc = &iser_conn->login_desc;
491 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
492
493 if (task != conn->login_task) {
494 iser_err("data present on non login task!!!\n");
495 goto send_control_error;
496 }
497
498 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
499 task->data_count, DMA_TO_DEVICE);
500
501 memcpy(desc->req, task->data, task->data_count);
502
503 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
504 task->data_count, DMA_TO_DEVICE);
505
506 tx_dsg->addr = desc->req_dma;
507 tx_dsg->length = task->data_count;
508 tx_dsg->lkey = device->pd->local_dma_lkey;
509 mdesc->num_sge = 2;
510 }
511
512 if (task == conn->login_task) {
513 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
514 task->hdr->opcode, data_seg_len);
515 err = iser_post_recvl(iser_conn);
516 if (err)
517 goto send_control_error;
518 err = iser_post_rx_bufs(conn, task->hdr);
519 if (err)
520 goto send_control_error;
521 }
522
523 err = iser_post_send(&iser_conn->ib_conn, mdesc);
524 if (!err)
525 return 0;
526
527 send_control_error:
528 iser_err("conn %p failed err %d\n",conn, err);
529 return err;
530 }
531
iser_login_rsp(struct ib_cq * cq,struct ib_wc * wc)532 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
533 {
534 struct ib_conn *ib_conn = wc->qp->qp_context;
535 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
536 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
537 struct iscsi_hdr *hdr;
538 char *data;
539 int length;
540 bool full_feature_phase;
541
542 if (unlikely(wc->status != IB_WC_SUCCESS)) {
543 iser_err_comp(wc, "login_rsp");
544 return;
545 }
546
547 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
548 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
549 DMA_FROM_DEVICE);
550
551 hdr = desc->rsp + sizeof(struct iser_ctrl);
552 data = desc->rsp + ISER_HEADERS_LEN;
553 length = wc->byte_len - ISER_HEADERS_LEN;
554 full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==
555 ISCSI_FULL_FEATURE_PHASE) &&
556 (hdr->flags & ISCSI_FLAG_CMD_FINAL);
557
558 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
559 hdr->itt, length);
560
561 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
562
563 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
564 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
565 DMA_FROM_DEVICE);
566
567 if (!full_feature_phase ||
568 iser_conn->iscsi_conn->session->discovery_sess)
569 return;
570
571 /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */
572 iser_post_recvm(iser_conn, iser_conn->rx_descs);
573 }
574
iser_inv_desc(struct iser_fr_desc * desc,u32 rkey)575 static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
576 {
577 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
578 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
579 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
580 return -EINVAL;
581 }
582
583 desc->rsc.mr_valid = 0;
584
585 return 0;
586 }
587
iser_check_remote_inv(struct iser_conn * iser_conn,struct ib_wc * wc,struct iscsi_hdr * hdr)588 static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
589 struct iscsi_hdr *hdr)
590 {
591 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
592 struct iscsi_task *task;
593 u32 rkey = wc->ex.invalidate_rkey;
594
595 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
596 iser_conn, rkey);
597
598 if (unlikely(!iser_conn->snd_w_inv)) {
599 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
600 iser_conn);
601 return -EPROTO;
602 }
603
604 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
605 if (likely(task)) {
606 struct iscsi_iser_task *iser_task = task->dd_data;
607 struct iser_fr_desc *desc;
608
609 if (iser_task->dir[ISER_DIR_IN]) {
610 desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
611 if (unlikely(iser_inv_desc(desc, rkey)))
612 return -EINVAL;
613 }
614
615 if (iser_task->dir[ISER_DIR_OUT]) {
616 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
617 if (unlikely(iser_inv_desc(desc, rkey)))
618 return -EINVAL;
619 }
620 } else {
621 iser_err("failed to get task for itt=%d\n", hdr->itt);
622 return -EINVAL;
623 }
624 }
625
626 return 0;
627 }
628
629
iser_task_rsp(struct ib_cq * cq,struct ib_wc * wc)630 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
631 {
632 struct ib_conn *ib_conn = wc->qp->qp_context;
633 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
634 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
635 struct iscsi_hdr *hdr;
636 int length, err;
637
638 if (unlikely(wc->status != IB_WC_SUCCESS)) {
639 iser_err_comp(wc, "task_rsp");
640 return;
641 }
642
643 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
644 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
645 DMA_FROM_DEVICE);
646
647 hdr = &desc->iscsi_header;
648 length = wc->byte_len - ISER_HEADERS_LEN;
649
650 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
651 hdr->itt, length);
652
653 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
654 iscsi_conn_failure(iser_conn->iscsi_conn,
655 ISCSI_ERR_CONN_FAILED);
656 return;
657 }
658
659 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
660
661 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
662 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
663 DMA_FROM_DEVICE);
664
665 err = iser_post_recvm(iser_conn, desc);
666 if (err)
667 iser_err("posting rx buffer err %d\n", err);
668 }
669
iser_cmd_comp(struct ib_cq * cq,struct ib_wc * wc)670 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
671 {
672 if (unlikely(wc->status != IB_WC_SUCCESS))
673 iser_err_comp(wc, "command");
674 }
675
iser_ctrl_comp(struct ib_cq * cq,struct ib_wc * wc)676 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
677 {
678 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
679 struct iscsi_task *task;
680
681 if (unlikely(wc->status != IB_WC_SUCCESS)) {
682 iser_err_comp(wc, "control");
683 return;
684 }
685
686 /* this arithmetic is legal by libiscsi dd_data allocation */
687 task = (void *)desc - sizeof(struct iscsi_task);
688 if (task->hdr->itt == RESERVED_ITT)
689 iscsi_put_task(task);
690 }
691
iser_dataout_comp(struct ib_cq * cq,struct ib_wc * wc)692 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
693 {
694 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
695 struct ib_conn *ib_conn = wc->qp->qp_context;
696 struct iser_device *device = ib_conn->device;
697
698 if (unlikely(wc->status != IB_WC_SUCCESS))
699 iser_err_comp(wc, "dataout");
700
701 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
702 ISER_HEADERS_LEN, DMA_TO_DEVICE);
703 kmem_cache_free(ig.desc_cache, desc);
704 }
705
iser_task_rdma_init(struct iscsi_iser_task * iser_task)706 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
707
708 {
709 iser_task->status = ISER_TASK_STATUS_INIT;
710
711 iser_task->dir[ISER_DIR_IN] = 0;
712 iser_task->dir[ISER_DIR_OUT] = 0;
713
714 iser_task->data[ISER_DIR_IN].data_len = 0;
715 iser_task->data[ISER_DIR_OUT].data_len = 0;
716
717 iser_task->prot[ISER_DIR_IN].data_len = 0;
718 iser_task->prot[ISER_DIR_OUT].data_len = 0;
719
720 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
721 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
722
723 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
724 sizeof(struct iser_mem_reg));
725 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
726 sizeof(struct iser_mem_reg));
727 }
728
iser_task_rdma_finalize(struct iscsi_iser_task * iser_task)729 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
730 {
731
732 if (iser_task->dir[ISER_DIR_IN]) {
733 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
734 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
735 DMA_FROM_DEVICE);
736 }
737
738 if (iser_task->dir[ISER_DIR_OUT]) {
739 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
740 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
741 DMA_TO_DEVICE);
742 }
743 }
744