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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / ulp / iser / iser_initiator.c
blob4a7045bb0831c367325f5483e782f6e8fc45188c
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 */
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 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
56
57 err = iser_dma_map_task_data(iser_task,
58 buf_in,
59 ISER_DIR_IN,
60 DMA_FROM_DEVICE);
61 if (err)
62 return err;
63
64 if (scsi_prot_sg_count(iser_task->sc)) {
65 struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN];
66
67 err = iser_dma_map_task_data(iser_task,
68 pbuf_in,
69 ISER_DIR_IN,
70 DMA_FROM_DEVICE);
71 if (err)
72 return err;
73 }
74
75 err = iser_reg_rdma_mem(iser_task, ISER_DIR_IN, false);
76 if (err) {
77 iser_err("Failed to set up Data-IN RDMA\n");
78 return err;
79 }
80 mem_reg = &iser_task->rdma_reg[ISER_DIR_IN];
81
82 hdr->flags |= ISER_RSV;
83 hdr->read_stag = cpu_to_be32(mem_reg->rkey);
84 hdr->read_va = cpu_to_be64(mem_reg->sge.addr);
85
86 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
87 task->itt, mem_reg->rkey,
88 (unsigned long long)mem_reg->sge.addr);
89
90 return 0;
91 }
92
93 /* Register user buffer memory and initialize passive rdma
94 * dto descriptor. Data size is stored in
95 * task->data[ISER_DIR_OUT].data_len, Protection size
96 * is stored at task->prot[ISER_DIR_OUT].data_len
97 */
98 static int
99 iser_prepare_write_cmd(struct iscsi_task *task,
100 unsigned int imm_sz,
101 unsigned int unsol_sz,
102 unsigned int edtl)
103 {
104 struct iscsi_iser_task *iser_task = task->dd_data;
105 struct iser_mem_reg *mem_reg;
106 int err;
107 struct iser_ctrl *hdr = &iser_task->desc.iser_header;
108 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
109 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
110
111 err = iser_dma_map_task_data(iser_task,
112 buf_out,
113 ISER_DIR_OUT,
114 DMA_TO_DEVICE);
115 if (err)
116 return err;
117
118 if (scsi_prot_sg_count(iser_task->sc)) {
119 struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT];
120
121 err = iser_dma_map_task_data(iser_task,
122 pbuf_out,
123 ISER_DIR_OUT,
124 DMA_TO_DEVICE);
125 if (err)
126 return err;
127 }
128
129 err = iser_reg_rdma_mem(iser_task, ISER_DIR_OUT,
130 buf_out->data_len == imm_sz);
131 if (err != 0) {
132 iser_err("Failed to register write cmd RDMA mem\n");
133 return err;
134 }
135
136 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
137
138 if (unsol_sz < edtl) {
139 hdr->flags |= ISER_WSV;
140 if (buf_out->data_len > imm_sz) {
141 hdr->write_stag = cpu_to_be32(mem_reg->rkey);
142 hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz);
143 }
144
145 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n",
146 task->itt, mem_reg->rkey,
147 (unsigned long long)mem_reg->sge.addr, unsol_sz);
148 }
149
150 if (imm_sz > 0) {
151 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
152 task->itt, imm_sz);
153 tx_dsg->addr = mem_reg->sge.addr;
154 tx_dsg->length = imm_sz;
155 tx_dsg->lkey = mem_reg->sge.lkey;
156 iser_task->desc.num_sge = 2;
157 }
158
159 return 0;
160 }
161
162 /* creates a new tx descriptor and adds header regd buffer */
163 static void iser_create_send_desc(struct iser_conn *iser_conn,
164 struct iser_tx_desc *tx_desc)
165 {
166 struct iser_device *device = iser_conn->ib_conn.device;
167
168 ib_dma_sync_single_for_cpu(device->ib_device,
169 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
170
171 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
172 tx_desc->iser_header.flags = ISER_VER;
173 tx_desc->num_sge = 1;
174 }
175
176 static void iser_free_login_buf(struct iser_conn *iser_conn)
177 {
178 struct iser_device *device = iser_conn->ib_conn.device;
179 struct iser_login_desc *desc = &iser_conn->login_desc;
180
181 if (!desc->req)
182 return;
183
184 ib_dma_unmap_single(device->ib_device, desc->req_dma,
185 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
186
187 ib_dma_unmap_single(device->ib_device, desc->rsp_dma,
188 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
189
190 kfree(desc->req);
191 kfree(desc->rsp);
192
193 /* make sure we never redo any unmapping */
194 desc->req = NULL;
195 desc->rsp = NULL;
196 }
197
198 static int iser_alloc_login_buf(struct iser_conn *iser_conn)
199 {
200 struct iser_device *device = iser_conn->ib_conn.device;
201 struct iser_login_desc *desc = &iser_conn->login_desc;
202
203 desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
204 if (!desc->req)
205 return -ENOMEM;
206
207 desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
208 ISCSI_DEF_MAX_RECV_SEG_LEN,
209 DMA_TO_DEVICE);
210 if (ib_dma_mapping_error(device->ib_device,
211 desc->req_dma))
212 goto free_req;
213
214 desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
215 if (!desc->rsp)
216 goto unmap_req;
217
218 desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
219 ISER_RX_LOGIN_SIZE,
220 DMA_FROM_DEVICE);
221 if (ib_dma_mapping_error(device->ib_device,
222 desc->rsp_dma))
223 goto free_rsp;
224
225 return 0;
226
227 free_rsp:
228 kfree(desc->rsp);
229 unmap_req:
230 ib_dma_unmap_single(device->ib_device, desc->req_dma,
231 ISCSI_DEF_MAX_RECV_SEG_LEN,
232 DMA_TO_DEVICE);
233 free_req:
234 kfree(desc->req);
235
236 return -ENOMEM;
237 }
238
239 int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
240 struct iscsi_session *session)
241 {
242 int i, j;
243 u64 dma_addr;
244 struct iser_rx_desc *rx_desc;
245 struct ib_sge *rx_sg;
246 struct ib_conn *ib_conn = &iser_conn->ib_conn;
247 struct iser_device *device = ib_conn->device;
248
249 iser_conn->qp_max_recv_dtos = session->cmds_max;
250 iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
251 iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
252
253 if (device->reg_ops->alloc_reg_res(ib_conn, session->scsi_cmds_max,
254 iser_conn->pages_per_mr))
255 goto create_rdma_reg_res_failed;
256
257 if (iser_alloc_login_buf(iser_conn))
258 goto alloc_login_buf_fail;
259
260 iser_conn->num_rx_descs = session->cmds_max;
261 iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs,
262 sizeof(struct iser_rx_desc),
263 GFP_KERNEL);
264 if (!iser_conn->rx_descs)
265 goto rx_desc_alloc_fail;
266
267 rx_desc = iser_conn->rx_descs;
268
269 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
270 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
272 if (ib_dma_mapping_error(device->ib_device, dma_addr))
273 goto rx_desc_dma_map_failed;
274
275 rx_desc->dma_addr = dma_addr;
276 rx_desc->cqe.done = iser_task_rsp;
277 rx_sg = &rx_desc->rx_sg;
278 rx_sg->addr = rx_desc->dma_addr;
279 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
280 rx_sg->lkey = device->pd->local_dma_lkey;
281 }
282
283 iser_conn->rx_desc_head = 0;
284 return 0;
285
286 rx_desc_dma_map_failed:
287 rx_desc = iser_conn->rx_descs;
288 for (j = 0; j < i; j++, rx_desc++)
289 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
290 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
291 kfree(iser_conn->rx_descs);
292 iser_conn->rx_descs = NULL;
293 rx_desc_alloc_fail:
294 iser_free_login_buf(iser_conn);
295 alloc_login_buf_fail:
296 device->reg_ops->free_reg_res(ib_conn);
297 create_rdma_reg_res_failed:
298 iser_err("failed allocating rx descriptors / data buffers\n");
299 return -ENOMEM;
300 }
301
302 void iser_free_rx_descriptors(struct iser_conn *iser_conn)
303 {
304 int i;
305 struct iser_rx_desc *rx_desc;
306 struct ib_conn *ib_conn = &iser_conn->ib_conn;
307 struct iser_device *device = ib_conn->device;
308
309 if (device->reg_ops->free_reg_res)
310 device->reg_ops->free_reg_res(ib_conn);
311
312 rx_desc = iser_conn->rx_descs;
313 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
314 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
315 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
316 kfree(iser_conn->rx_descs);
317 /* make sure we never redo any unmapping */
318 iser_conn->rx_descs = NULL;
319
320 iser_free_login_buf(iser_conn);
321 }
322
323 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
324 {
325 struct iser_conn *iser_conn = conn->dd_data;
326 struct ib_conn *ib_conn = &iser_conn->ib_conn;
327 struct iscsi_session *session = conn->session;
328
329 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
330 /* check if this is the last login - going to full feature phase */
331 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
332 return 0;
333
334 /*
335 * Check that there is one posted recv buffer
336 * (for the last login response).
337 */
338 WARN_ON(ib_conn->post_recv_buf_count != 1);
339
340 if (session->discovery_sess) {
341 iser_info("Discovery session, re-using login RX buffer\n");
342 return 0;
343 } else
344 iser_info("Normal session, posting batch of RX %d buffers\n",
345 iser_conn->min_posted_rx);
346
347 /* Initial post receive buffers */
348 if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx))
349 return -ENOMEM;
350
351 return 0;
352 }
353
354 static inline bool iser_signal_comp(u8 sig_count)
355 {
356 return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0);
357 }
358
359 /**
360 * iser_send_command - send command PDU
361 * @conn: link to matching iscsi connection
362 * @task: SCSI command task
363 */
364 int iser_send_command(struct iscsi_conn *conn,
365 struct iscsi_task *task)
366 {
367 struct iser_conn *iser_conn = conn->dd_data;
368 struct iscsi_iser_task *iser_task = task->dd_data;
369 unsigned long edtl;
370 int err;
371 struct iser_data_buf *data_buf, *prot_buf;
372 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
373 struct scsi_cmnd *sc = task->sc;
374 struct iser_tx_desc *tx_desc = &iser_task->desc;
375 u8 sig_count = ++iser_conn->ib_conn.sig_count;
376
377 edtl = ntohl(hdr->data_length);
378
379 /* build the tx desc regd header and add it to the tx desc dto */
380 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
381 tx_desc->cqe.done = iser_cmd_comp;
382 iser_create_send_desc(iser_conn, tx_desc);
383
384 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
385 data_buf = &iser_task->data[ISER_DIR_IN];
386 prot_buf = &iser_task->prot[ISER_DIR_IN];
387 } else {
388 data_buf = &iser_task->data[ISER_DIR_OUT];
389 prot_buf = &iser_task->prot[ISER_DIR_OUT];
390 }
391
392 if (scsi_sg_count(sc)) { /* using a scatter list */
393 data_buf->sg = scsi_sglist(sc);
394 data_buf->size = scsi_sg_count(sc);
395 }
396 data_buf->data_len = scsi_bufflen(sc);
397
398 if (scsi_prot_sg_count(sc)) {
399 prot_buf->sg = scsi_prot_sglist(sc);
400 prot_buf->size = scsi_prot_sg_count(sc);
401 prot_buf->data_len = (data_buf->data_len >>
402 ilog2(sc->device->sector_size)) * 8;
403 }
404
405 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
406 err = iser_prepare_read_cmd(task);
407 if (err)
408 goto send_command_error;
409 }
410 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
411 err = iser_prepare_write_cmd(task,
412 task->imm_count,
413 task->imm_count +
414 task->unsol_r2t.data_length,
415 edtl);
416 if (err)
417 goto send_command_error;
418 }
419
420 iser_task->status = ISER_TASK_STATUS_STARTED;
421
422 err = iser_post_send(&iser_conn->ib_conn, tx_desc,
423 iser_signal_comp(sig_count));
424 if (!err)
425 return 0;
426
427 send_command_error:
428 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
429 return err;
430 }
431
432 /**
433 * iser_send_data_out - send data out PDU
434 * @conn: link to matching iscsi connection
435 * @task: SCSI command task
436 * @hdr: pointer to the LLD's iSCSI message header
437 */
438 int iser_send_data_out(struct iscsi_conn *conn,
439 struct iscsi_task *task,
440 struct iscsi_data *hdr)
441 {
442 struct iser_conn *iser_conn = conn->dd_data;
443 struct iscsi_iser_task *iser_task = task->dd_data;
444 struct iser_tx_desc *tx_desc;
445 struct iser_mem_reg *mem_reg;
446 unsigned long buf_offset;
447 unsigned long data_seg_len;
448 uint32_t itt;
449 int err;
450 struct ib_sge *tx_dsg;
451
452 itt = (__force uint32_t)hdr->itt;
453 data_seg_len = ntoh24(hdr->dlength);
454 buf_offset = ntohl(hdr->offset);
455
456 iser_dbg("%s itt %d dseg_len %d offset %d\n",
457 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
458
459 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
460 if (!tx_desc)
461 return -ENOMEM;
462
463 tx_desc->type = ISCSI_TX_DATAOUT;
464 tx_desc->cqe.done = iser_dataout_comp;
465 tx_desc->iser_header.flags = ISER_VER;
466 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
467
468 /* build the tx desc */
469 err = iser_initialize_task_headers(task, tx_desc);
470 if (err)
471 goto send_data_out_error;
472
473 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
474 tx_dsg = &tx_desc->tx_sg[1];
475 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
476 tx_dsg->length = data_seg_len;
477 tx_dsg->lkey = mem_reg->sge.lkey;
478 tx_desc->num_sge = 2;
479
480 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
481 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
482 buf_offset, data_seg_len,
483 iser_task->data[ISER_DIR_OUT].data_len, itt);
484 err = -EINVAL;
485 goto send_data_out_error;
486 }
487 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
488 itt, buf_offset, data_seg_len);
489
490
491 err = iser_post_send(&iser_conn->ib_conn, tx_desc, true);
492 if (!err)
493 return 0;
494
495 send_data_out_error:
496 kmem_cache_free(ig.desc_cache, tx_desc);
497 iser_err("conn %p failed err %d\n", conn, err);
498 return err;
499 }
500
501 int iser_send_control(struct iscsi_conn *conn,
502 struct iscsi_task *task)
503 {
504 struct iser_conn *iser_conn = conn->dd_data;
505 struct iscsi_iser_task *iser_task = task->dd_data;
506 struct iser_tx_desc *mdesc = &iser_task->desc;
507 unsigned long data_seg_len;
508 int err = 0;
509 struct iser_device *device;
510
511 /* build the tx desc regd header and add it to the tx desc dto */
512 mdesc->type = ISCSI_TX_CONTROL;
513 mdesc->cqe.done = iser_ctrl_comp;
514 iser_create_send_desc(iser_conn, mdesc);
515
516 device = iser_conn->ib_conn.device;
517
518 data_seg_len = ntoh24(task->hdr->dlength);
519
520 if (data_seg_len > 0) {
521 struct iser_login_desc *desc = &iser_conn->login_desc;
522 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
523
524 if (task != conn->login_task) {
525 iser_err("data present on non login task!!!\n");
526 goto send_control_error;
527 }
528
529 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
530 task->data_count, DMA_TO_DEVICE);
531
532 memcpy(desc->req, task->data, task->data_count);
533
534 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
535 task->data_count, DMA_TO_DEVICE);
536
537 tx_dsg->addr = desc->req_dma;
538 tx_dsg->length = task->data_count;
539 tx_dsg->lkey = device->pd->local_dma_lkey;
540 mdesc->num_sge = 2;
541 }
542
543 if (task == conn->login_task) {
544 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
545 task->hdr->opcode, data_seg_len);
546 err = iser_post_recvl(iser_conn);
547 if (err)
548 goto send_control_error;
549 err = iser_post_rx_bufs(conn, task->hdr);
550 if (err)
551 goto send_control_error;
552 }
553
554 err = iser_post_send(&iser_conn->ib_conn, mdesc, true);
555 if (!err)
556 return 0;
557
558 send_control_error:
559 iser_err("conn %p failed err %d\n",conn, err);
560 return err;
561 }
562
563 void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
564 {
565 struct ib_conn *ib_conn = wc->qp->qp_context;
566 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
567 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
568 struct iscsi_hdr *hdr;
569 char *data;
570 int length;
571
572 if (unlikely(wc->status != IB_WC_SUCCESS)) {
573 iser_err_comp(wc, "login_rsp");
574 return;
575 }
576
577 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
578 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
579 DMA_FROM_DEVICE);
580
581 hdr = desc->rsp + sizeof(struct iser_ctrl);
582 data = desc->rsp + ISER_HEADERS_LEN;
583 length = wc->byte_len - ISER_HEADERS_LEN;
584
585 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
586 hdr->itt, length);
587
588 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
589
590 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
591 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
592 DMA_FROM_DEVICE);
593
594 ib_conn->post_recv_buf_count--;
595 }
596
597 static inline int
598 iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
599 {
600 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
601 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
602 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
603 return -EINVAL;
604 }
605
606 desc->rsc.mr_valid = 0;
607
608 return 0;
609 }
610
611 static int
612 iser_check_remote_inv(struct iser_conn *iser_conn,
613 struct ib_wc *wc,
614 struct iscsi_hdr *hdr)
615 {
616 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
617 struct iscsi_task *task;
618 u32 rkey = wc->ex.invalidate_rkey;
619
620 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
621 iser_conn, rkey);
622
623 if (unlikely(!iser_conn->snd_w_inv)) {
624 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
625 iser_conn);
626 return -EPROTO;
627 }
628
629 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
630 if (likely(task)) {
631 struct iscsi_iser_task *iser_task = task->dd_data;
632 struct iser_fr_desc *desc;
633
634 if (iser_task->dir[ISER_DIR_IN]) {
635 desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h;
636 if (unlikely(iser_inv_desc(desc, rkey)))
637 return -EINVAL;
638 }
639
640 if (iser_task->dir[ISER_DIR_OUT]) {
641 desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h;
642 if (unlikely(iser_inv_desc(desc, rkey)))
643 return -EINVAL;
644 }
645 } else {
646 iser_err("failed to get task for itt=%d\n", hdr->itt);
647 return -EINVAL;
648 }
649 }
650
651 return 0;
652 }
653
654
655 void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
656 {
657 struct ib_conn *ib_conn = wc->qp->qp_context;
658 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
659 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
660 struct iscsi_hdr *hdr;
661 int length;
662 int outstanding, count, err;
663
664 if (unlikely(wc->status != IB_WC_SUCCESS)) {
665 iser_err_comp(wc, "task_rsp");
666 return;
667 }
668
669 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
670 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
671 DMA_FROM_DEVICE);
672
673 hdr = &desc->iscsi_header;
674 length = wc->byte_len - ISER_HEADERS_LEN;
675
676 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
677 hdr->itt, length);
678
679 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
680 iscsi_conn_failure(iser_conn->iscsi_conn,
681 ISCSI_ERR_CONN_FAILED);
682 return;
683 }
684
685 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
686
687 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
688 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
689 DMA_FROM_DEVICE);
690
691 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
692 * task eliminates the need to worry on tasks which are completed in *
693 * parallel to the execution of iser_conn_term. So the code that waits *
694 * for the posted rx bufs refcount to become zero handles everything */
695 ib_conn->post_recv_buf_count--;
696
697 outstanding = ib_conn->post_recv_buf_count;
698 if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) {
699 count = min(iser_conn->qp_max_recv_dtos - outstanding,
700 iser_conn->min_posted_rx);
701 err = iser_post_recvm(iser_conn, count);
702 if (err)
703 iser_err("posting %d rx bufs err %d\n", count, err);
704 }
705 }
706
707 void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
708 {
709 if (unlikely(wc->status != IB_WC_SUCCESS))
710 iser_err_comp(wc, "command");
711 }
712
713 void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
714 {
715 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
716 struct iscsi_task *task;
717
718 if (unlikely(wc->status != IB_WC_SUCCESS)) {
719 iser_err_comp(wc, "control");
720 return;
721 }
722
723 /* this arithmetic is legal by libiscsi dd_data allocation */
724 task = (void *)desc - sizeof(struct iscsi_task);
725 if (task->hdr->itt == RESERVED_ITT)
726 iscsi_put_task(task);
727 }
728
729 void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
730 {
731 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
732 struct ib_conn *ib_conn = wc->qp->qp_context;
733 struct iser_device *device = ib_conn->device;
734
735 if (unlikely(wc->status != IB_WC_SUCCESS))
736 iser_err_comp(wc, "dataout");
737
738 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
739 ISER_HEADERS_LEN, DMA_TO_DEVICE);
740 kmem_cache_free(ig.desc_cache, desc);
741 }
742
743 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
744
745 {
746 iser_task->status = ISER_TASK_STATUS_INIT;
747
748 iser_task->dir[ISER_DIR_IN] = 0;
749 iser_task->dir[ISER_DIR_OUT] = 0;
750
751 iser_task->data[ISER_DIR_IN].data_len = 0;
752 iser_task->data[ISER_DIR_OUT].data_len = 0;
753
754 iser_task->prot[ISER_DIR_IN].data_len = 0;
755 iser_task->prot[ISER_DIR_OUT].data_len = 0;
756
757 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
758 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
759
760 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
761 sizeof(struct iser_mem_reg));
762 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
763 sizeof(struct iser_mem_reg));
764 }
765
766 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
767 {
768 int prot_count = scsi_prot_sg_count(iser_task->sc);
769
770 if (iser_task->dir[ISER_DIR_IN]) {
771 iser_unreg_rdma_mem(iser_task, ISER_DIR_IN);
772 iser_dma_unmap_task_data(iser_task,
773 &iser_task->data[ISER_DIR_IN],
774 DMA_FROM_DEVICE);
775 if (prot_count)
776 iser_dma_unmap_task_data(iser_task,
777 &iser_task->prot[ISER_DIR_IN],
778 DMA_FROM_DEVICE);
779 }
780
781 if (iser_task->dir[ISER_DIR_OUT]) {
782 iser_unreg_rdma_mem(iser_task, ISER_DIR_OUT);
783 iser_dma_unmap_task_data(iser_task,
784 &iser_task->data[ISER_DIR_OUT],
785 DMA_TO_DEVICE);
786 if (prot_count)
787 iser_dma_unmap_task_data(iser_task,
788 &iser_task->prot[ISER_DIR_OUT],
789 DMA_TO_DEVICE);
790 }
791 }
Linux with added FPC-III support