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,enum iser_desc_type type,void (* done)(struct ib_cq * cq,struct ib_wc * wc))143 static void iser_create_send_desc(struct iser_conn *iser_conn,
144 struct iser_tx_desc *tx_desc, enum iser_desc_type type,
145 void (*done)(struct ib_cq *cq, struct ib_wc *wc))
146 {
147 struct iser_device *device = iser_conn->ib_conn.device;
148
149 tx_desc->type = type;
150 tx_desc->cqe.done = done;
151
152 ib_dma_sync_single_for_cpu(device->ib_device,
153 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
154
155 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
156 tx_desc->iser_header.flags = ISER_VER;
157 tx_desc->num_sge = 1;
158 }
159
iser_free_login_buf(struct iser_conn * iser_conn)160 static void iser_free_login_buf(struct iser_conn *iser_conn)
161 {
162 struct iser_device *device = iser_conn->ib_conn.device;
163 struct iser_login_desc *desc = &iser_conn->login_desc;
164
165 if (!desc->req)
166 return;
167
168 ib_dma_unmap_single(device->ib_device, desc->req_dma,
169 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
170
171 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
172 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
173
174 kfree(desc->req);
175 kfree(desc->rsp);
176
177 /* make sure we never redo any unmapping */
178 desc->req = NULL;
179 desc->rsp = NULL;
180 }
181
iser_alloc_login_buf(struct iser_conn * iser_conn)182 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
183 {
184 struct iser_device *device = iser_conn->ib_conn.device;
185 struct iser_login_desc *desc = &iser_conn->login_desc;
186
187 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
188 if (!desc->req)
189 return -ENOMEM;
190
191 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
192 ISCSI_DEF_MAX_RECV_SEG_LEN,
193 DMA_TO_DEVICE);
194 if (ib_dma_mapping_error(device->ib_device,
195 desc->req_dma))
196 goto free_req;
197
198 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
199 if (!desc->rsp)
200 goto unmap_req;
201
202 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
203 ISER_RX_LOGIN_SIZE,
204 DMA_FROM_DEVICE);
205 if (ib_dma_mapping_error(device->ib_device,
206 desc->rsp_dma))
207 goto free_rsp;
208
209 return 0;
210
211 free_rsp:
212 kfree(desc->rsp);
213 unmap_req:
214 ib_dma_unmap_single(device->ib_device, desc->req_dma,
215 ISCSI_DEF_MAX_RECV_SEG_LEN,
216 DMA_TO_DEVICE);
217 free_req:
218 kfree(desc->req);
219
220 return -ENOMEM;
221 }
222
iser_alloc_rx_descriptors(struct iser_conn * iser_conn,struct iscsi_session * session)223 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
224 struct iscsi_session *session)
225 {
226 int i, j;
227 u64 dma_addr;
228 struct iser_rx_desc *rx_desc;
229 struct ib_sge *rx_sg;
230 struct ib_conn *ib_conn = &iser_conn->ib_conn;
231 struct iser_device *device = ib_conn->device;
232
233 iser_conn->qp_max_recv_dtos = session->cmds_max;
234
235 if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max,
236 iser_conn->pages_per_mr))
237 goto create_rdma_reg_res_failed;
238
239 if (iser_alloc_login_buf(iser_conn))
240 goto alloc_login_buf_fail;
241
242 iser_conn->num_rx_descs = session->cmds_max;
243 iser_conn->rx_descs = kmalloc_objs(struct iser_rx_desc,
244 iser_conn->num_rx_descs);
245 if (!iser_conn->rx_descs)
246 goto rx_desc_alloc_fail;
247
248 rx_desc = iser_conn->rx_descs;
249
250 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
251 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
252 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
253 if (ib_dma_mapping_error(device->ib_device, dma_addr))
254 goto rx_desc_dma_map_failed;
255
256 rx_desc->dma_addr = dma_addr;
257 rx_desc->cqe.done = iser_task_rsp;
258 rx_sg = &rx_desc->rx_sg;
259 rx_sg->addr = rx_desc->dma_addr;
260 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
261 rx_sg->lkey = device->pd->local_dma_lkey;
262 }
263
264 return 0;
265
266 rx_desc_dma_map_failed:
267 rx_desc = iser_conn->rx_descs;
268 for (j = 0; j < i; j++, rx_desc++)
269 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
270 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
271 kfree(iser_conn->rx_descs);
272 iser_conn->rx_descs = NULL;
273 rx_desc_alloc_fail:
274 iser_free_login_buf(iser_conn);
275 alloc_login_buf_fail:
276 iser_free_fastreg_pool(ib_conn);
277 create_rdma_reg_res_failed:
278 iser_err("failed allocating rx descriptors / data buffers\n");
279 return -ENOMEM;
280 }
281
iser_free_rx_descriptors(struct iser_conn * iser_conn)282 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
283 {
284 int i;
285 struct iser_rx_desc *rx_desc;
286 struct ib_conn *ib_conn = &iser_conn->ib_conn;
287 struct iser_device *device = ib_conn->device;
288
289 iser_free_fastreg_pool(ib_conn);
290
291 rx_desc = iser_conn->rx_descs;
292 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
293 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
294 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
295 kfree(iser_conn->rx_descs);
296 /* make sure we never redo any unmapping */
297 iser_conn->rx_descs = NULL;
298
299 iser_free_login_buf(iser_conn);
300 }
301
iser_post_rx_bufs(struct iscsi_conn * conn,struct iscsi_hdr * req)302 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
303 {
304 struct iser_conn *iser_conn = conn->dd_data;
305 struct iscsi_session *session = conn->session;
306 int err = 0;
307 int i;
308
309 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
310 /* check if this is the last login - going to full feature phase */
311 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
312 goto out;
313
314 if (session->discovery_sess) {
315 iser_info("Discovery session, re-using login RX buffer\n");
316 goto out;
317 }
318
319 iser_info("Normal session, posting batch of RX %d buffers\n",
320 iser_conn->qp_max_recv_dtos - 1);
321
322 /*
323 * Initial post receive buffers.
324 * There is one already posted recv buffer (for the last login
325 * response). Therefore, the first recv buffer is skipped here.
326 */
327 for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
328 err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
329 if (err)
330 goto out;
331 }
332 out:
333 return err;
334 }
335
336 /**
337 * iser_send_command - send command PDU
338 * @conn: link to matching iscsi connection
339 * @task: SCSI command task
340 */
iser_send_command(struct iscsi_conn * conn,struct iscsi_task * task)341 int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
342 {
343 struct iser_conn *iser_conn = conn->dd_data;
344 struct iscsi_iser_task *iser_task = task->dd_data;
345 unsigned long edtl;
346 int err;
347 struct iser_data_buf *data_buf, *prot_buf;
348 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
349 struct scsi_cmnd *sc = task->sc;
350 struct iser_tx_desc *tx_desc = &iser_task->desc;
351
352 edtl = ntohl(hdr->data_length);
353
354 /* build the tx desc regd header and add it to the tx desc dto */
355 iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND,
356 iser_cmd_comp);
357
358 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
359 data_buf = &iser_task->data[ISER_DIR_IN];
360 prot_buf = &iser_task->prot[ISER_DIR_IN];
361 } else {
362 data_buf = &iser_task->data[ISER_DIR_OUT];
363 prot_buf = &iser_task->prot[ISER_DIR_OUT];
364 }
365
366 if (scsi_sg_count(sc)) { /* using a scatter list */
367 data_buf->sg = scsi_sglist(sc);
368 data_buf->size = scsi_sg_count(sc);
369 }
370 data_buf->data_len = scsi_bufflen(sc);
371
372 if (scsi_prot_sg_count(sc)) {
373 prot_buf->sg = scsi_prot_sglist(sc);
374 prot_buf->size = scsi_prot_sg_count(sc);
375 prot_buf->data_len = (data_buf->data_len >>
376 ilog2(sc->device->sector_size)) * 8;
377 }
378
379 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
380 err = iser_prepare_read_cmd(task);
381 if (err)
382 goto send_command_error;
383 }
384 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
385 err = iser_prepare_write_cmd(task,
386 task->imm_count,
387 task->imm_count +
388 task->unsol_r2t.data_length,
389 edtl);
390 if (err)
391 goto send_command_error;
392 }
393
394 iser_task->status = ISER_TASK_STATUS_STARTED;
395
396 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
397 if (!err)
398 return 0;
399
400 send_command_error:
401 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
402 return err;
403 }
404
405 /**
406 * iser_send_data_out - send data out PDU
407 * @conn: link to matching iscsi connection
408 * @task: SCSI command task
409 * @hdr: pointer to the LLD's iSCSI message header
410 */
iser_send_data_out(struct iscsi_conn * conn,struct iscsi_task * task,struct iscsi_data * hdr)411 int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
412 struct iscsi_data *hdr)
413 {
414 struct iser_conn *iser_conn = conn->dd_data;
415 struct iscsi_iser_task *iser_task = task->dd_data;
416 struct iser_tx_desc *tx_desc;
417 struct iser_mem_reg *mem_reg;
418 unsigned long buf_offset;
419 unsigned long data_seg_len;
420 uint32_t itt;
421 int err;
422 struct ib_sge *tx_dsg;
423
424 itt = (__force uint32_t)hdr->itt;
425 data_seg_len = ntoh24(hdr->dlength);
426 buf_offset = ntohl(hdr->offset);
427
428 iser_dbg("%s itt %d dseg_len %d offset %d\n",
429 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
430
431 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
432 if (!tx_desc)
433 return -ENOMEM;
434
435 tx_desc->type = ISCSI_TX_DATAOUT;
436 tx_desc->cqe.done = iser_dataout_comp;
437 tx_desc->iser_header.flags = ISER_VER;
438 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
439
440 /* build the tx desc */
441 err = iser_initialize_task_headers(task, tx_desc);
442 if (err)
443 goto send_data_out_error;
444
445 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
446 tx_dsg = &tx_desc->tx_sg[1];
447 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
448 tx_dsg->length = data_seg_len;
449 tx_dsg->lkey = mem_reg->sge.lkey;
450 tx_desc->num_sge = 2;
451
452 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
453 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
454 buf_offset, data_seg_len,
455 iser_task->data[ISER_DIR_OUT].data_len, itt);
456 err = -EINVAL;
457 goto send_data_out_error;
458 }
459 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
460 itt, buf_offset, data_seg_len);
461
462 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
463 if (!err)
464 return 0;
465
466 send_data_out_error:
467 kmem_cache_free(ig.desc_cache, tx_desc);
468 iser_err("conn %p failed err %d\n", conn, err);
469 return err;
470 }
471
iser_send_control(struct iscsi_conn * conn,struct iscsi_task * task)472 int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
473 {
474 struct iser_conn *iser_conn = conn->dd_data;
475 struct iscsi_iser_task *iser_task = task->dd_data;
476 struct iser_tx_desc *mdesc = &iser_task->desc;
477 unsigned long data_seg_len;
478 int err = 0;
479 struct iser_device *device;
480
481 /* build the tx desc regd header and add it to the tx desc dto */
482 iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL,
483 iser_ctrl_comp);
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 if (desc->sig_protected)
584 desc->rsc.sig_mr->need_inval = false;
585 else
586 desc->rsc.mr->need_inval = false;
587
588 return 0;
589 }
590
iser_check_remote_inv(struct iser_conn * iser_conn,struct ib_wc * wc,struct iscsi_hdr * hdr)591 static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
592 struct iscsi_hdr *hdr)
593 {
594 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
595 struct iscsi_task *task;
596 u32 rkey = wc->ex.invalidate_rkey;
597
598 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
599 iser_conn, rkey);
600
601 if (unlikely(!iser_conn->snd_w_inv)) {
602 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
603 iser_conn);
604 return -EPROTO;
605 }
606
607 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
608 if (likely(task)) {
609 struct iscsi_iser_task *iser_task = task->dd_data;
610 struct iser_fr_desc *desc;
611
612 if (iser_task->dir[ISER_DIR_IN]) {
613 desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
614 if (unlikely(iser_inv_desc(desc, rkey)))
615 return -EINVAL;
616 }
617
618 if (iser_task->dir[ISER_DIR_OUT]) {
619 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
620 if (unlikely(iser_inv_desc(desc, rkey)))
621 return -EINVAL;
622 }
623 } else {
624 iser_err("failed to get task for itt=%d\n", hdr->itt);
625 return -EINVAL;
626 }
627 }
628
629 return 0;
630 }
631
632
iser_task_rsp(struct ib_cq * cq,struct ib_wc * wc)633 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
634 {
635 struct ib_conn *ib_conn = wc->qp->qp_context;
636 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
637 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
638 struct iscsi_hdr *hdr;
639 int length, err;
640
641 if (unlikely(wc->status != IB_WC_SUCCESS)) {
642 iser_err_comp(wc, "task_rsp");
643 return;
644 }
645
646 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
647 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
648 DMA_FROM_DEVICE);
649
650 hdr = &desc->iscsi_header;
651 length = wc->byte_len - ISER_HEADERS_LEN;
652
653 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
654 hdr->itt, length);
655
656 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
657 iscsi_conn_failure(iser_conn->iscsi_conn,
658 ISCSI_ERR_CONN_FAILED);
659 return;
660 }
661
662 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
663
664 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
665 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
666 DMA_FROM_DEVICE);
667
668 err = iser_post_recvm(iser_conn, desc);
669 if (err)
670 iser_err("posting rx buffer err %d\n", err);
671 }
672
iser_cmd_comp(struct ib_cq * cq,struct ib_wc * wc)673 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
674 {
675 if (unlikely(wc->status != IB_WC_SUCCESS))
676 iser_err_comp(wc, "command");
677 }
678
iser_ctrl_comp(struct ib_cq * cq,struct ib_wc * wc)679 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
680 {
681 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
682 struct iscsi_task *task;
683
684 if (unlikely(wc->status != IB_WC_SUCCESS)) {
685 iser_err_comp(wc, "control");
686 return;
687 }
688
689 /* this arithmetic is legal by libiscsi dd_data allocation */
690 task = (void *)desc - sizeof(struct iscsi_task);
691 if (task->hdr->itt == RESERVED_ITT)
692 iscsi_put_task(task);
693 }
694
iser_dataout_comp(struct ib_cq * cq,struct ib_wc * wc)695 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
696 {
697 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
698 struct ib_conn *ib_conn = wc->qp->qp_context;
699 struct iser_device *device = ib_conn->device;
700
701 if (unlikely(wc->status != IB_WC_SUCCESS))
702 iser_err_comp(wc, "dataout");
703
704 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
705 ISER_HEADERS_LEN, DMA_TO_DEVICE);
706 kmem_cache_free(ig.desc_cache, desc);
707 }
708
iser_task_rdma_init(struct iscsi_iser_task * iser_task)709 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
710
711 {
712 iser_task->status = ISER_TASK_STATUS_INIT;
713
714 iser_task->dir[ISER_DIR_IN] = 0;
715 iser_task->dir[ISER_DIR_OUT] = 0;
716
717 iser_task->data[ISER_DIR_IN].data_len = 0;
718 iser_task->data[ISER_DIR_OUT].data_len = 0;
719
720 iser_task->prot[ISER_DIR_IN].data_len = 0;
721 iser_task->prot[ISER_DIR_OUT].data_len = 0;
722
723 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
724 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
725
726 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
727 sizeof(struct iser_mem_reg));
728 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
729 sizeof(struct iser_mem_reg));
730 }
731
iser_task_rdma_finalize(struct iscsi_iser_task * iser_task)732 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
733 {
734
735 if (iser_task->dir[ISER_DIR_IN]) {
736 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
737 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
738 DMA_FROM_DEVICE);
739 }
740
741 if (iser_task->dir[ISER_DIR_OUT]) {
742 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
743 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
744 DMA_TO_DEVICE);
745 }
746 }
747