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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 */
48static 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
79out_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 */
89static 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
137out_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 */
143static 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
160static 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
182static 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
211free_rsp:
212 kfree(desc->rsp);
213unmap_req:
214 ib_dma_unmap_single(device->ib_device, desc->req_dma,
215 ISCSI_DEF_MAX_RECV_SEG_LEN,
216 DMA_TO_DEVICE);
217free_req:
218 kfree(desc->req);
219
220 return -ENOMEM;
221}
222
223int 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_array(iser_conn->num_rx_descs,
244 sizeof(struct iser_rx_desc),
245 GFP_KERNEL);
246 if (!iser_conn->rx_descs)
247 goto rx_desc_alloc_fail;
248
249 rx_desc = iser_conn->rx_descs;
250
251 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
252 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
253 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
254 if (ib_dma_mapping_error(device->ib_device, dma_addr))
255 goto rx_desc_dma_map_failed;
256
257 rx_desc->dma_addr = dma_addr;
258 rx_desc->cqe.done = iser_task_rsp;
259 rx_sg = &rx_desc->rx_sg;
260 rx_sg->addr = rx_desc->dma_addr;
261 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
262 rx_sg->lkey = device->pd->local_dma_lkey;
263 }
264
265 return 0;
266
267rx_desc_dma_map_failed:
268 rx_desc = iser_conn->rx_descs;
269 for (j = 0; j < i; j++, rx_desc++)
270 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
271 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
272 kfree(iser_conn->rx_descs);
273 iser_conn->rx_descs = NULL;
274rx_desc_alloc_fail:
275 iser_free_login_buf(iser_conn);
276alloc_login_buf_fail:
277 iser_free_fastreg_pool(ib_conn);
278create_rdma_reg_res_failed:
279 iser_err("failed allocating rx descriptors / data buffers\n");
280 return -ENOMEM;
281}
282
283void iser_free_rx_descriptors(struct iser_conn *iser_conn)
284{
285 int i;
286 struct iser_rx_desc *rx_desc;
287 struct ib_conn *ib_conn = &iser_conn->ib_conn;
288 struct iser_device *device = ib_conn->device;
289
290 iser_free_fastreg_pool(ib_conn);
291
292 rx_desc = iser_conn->rx_descs;
293 for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++)
294 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
295 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
296 kfree(iser_conn->rx_descs);
297 /* make sure we never redo any unmapping */
298 iser_conn->rx_descs = NULL;
299
300 iser_free_login_buf(iser_conn);
301}
302
303static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
304{
305 struct iser_conn *iser_conn = conn->dd_data;
306 struct iscsi_session *session = conn->session;
307 int err = 0;
308 int i;
309
310 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
311 /* check if this is the last login - going to full feature phase */
312 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
313 goto out;
314
315 if (session->discovery_sess) {
316 iser_info("Discovery session, re-using login RX buffer\n");
317 goto out;
318 }
319
320 iser_info("Normal session, posting batch of RX %d buffers\n",
321 iser_conn->qp_max_recv_dtos - 1);
322
323 /*
324 * Initial post receive buffers.
325 * There is one already posted recv buffer (for the last login
326 * response). Therefore, the first recv buffer is skipped here.
327 */
328 for (i = 1; i < iser_conn->qp_max_recv_dtos; i++) {
329 err = iser_post_recvm(iser_conn, &iser_conn->rx_descs[i]);
330 if (err)
331 goto out;
332 }
333out:
334 return err;
335}
336
337/**
338 * iser_send_command - send command PDU
339 * @conn: link to matching iscsi connection
340 * @task: SCSI command task
341 */
342int iser_send_command(struct iscsi_conn *conn, struct iscsi_task *task)
343{
344 struct iser_conn *iser_conn = conn->dd_data;
345 struct iscsi_iser_task *iser_task = task->dd_data;
346 unsigned long edtl;
347 int err;
348 struct iser_data_buf *data_buf, *prot_buf;
349 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
350 struct scsi_cmnd *sc = task->sc;
351 struct iser_tx_desc *tx_desc = &iser_task->desc;
352
353 edtl = ntohl(hdr->data_length);
354
355 /* build the tx desc regd header and add it to the tx desc dto */
356 iser_create_send_desc(iser_conn, tx_desc, ISCSI_TX_SCSI_COMMAND,
357 iser_cmd_comp);
358
359 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
360 data_buf = &iser_task->data[ISER_DIR_IN];
361 prot_buf = &iser_task->prot[ISER_DIR_IN];
362 } else {
363 data_buf = &iser_task->data[ISER_DIR_OUT];
364 prot_buf = &iser_task->prot[ISER_DIR_OUT];
365 }
366
367 if (scsi_sg_count(sc)) { /* using a scatter list */
368 data_buf->sg = scsi_sglist(sc);
369 data_buf->size = scsi_sg_count(sc);
370 }
371 data_buf->data_len = scsi_bufflen(sc);
372
373 if (scsi_prot_sg_count(sc)) {
374 prot_buf->sg = scsi_prot_sglist(sc);
375 prot_buf->size = scsi_prot_sg_count(sc);
376 prot_buf->data_len = (data_buf->data_len >>
377 ilog2(sc->device->sector_size)) * 8;
378 }
379
380 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
381 err = iser_prepare_read_cmd(task);
382 if (err)
383 goto send_command_error;
384 }
385 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
386 err = iser_prepare_write_cmd(task,
387 task->imm_count,
388 task->imm_count +
389 task->unsol_r2t.data_length,
390 edtl);
391 if (err)
392 goto send_command_error;
393 }
394
395 iser_task->status = ISER_TASK_STATUS_STARTED;
396
397 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
398 if (!err)
399 return 0;
400
401send_command_error:
402 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
403 return err;
404}
405
406/**
407 * iser_send_data_out - send data out PDU
408 * @conn: link to matching iscsi connection
409 * @task: SCSI command task
410 * @hdr: pointer to the LLD's iSCSI message header
411 */
412int iser_send_data_out(struct iscsi_conn *conn, struct iscsi_task *task,
413 struct iscsi_data *hdr)
414{
415 struct iser_conn *iser_conn = conn->dd_data;
416 struct iscsi_iser_task *iser_task = task->dd_data;
417 struct iser_tx_desc *tx_desc;
418 struct iser_mem_reg *mem_reg;
419 unsigned long buf_offset;
420 unsigned long data_seg_len;
421 uint32_t itt;
422 int err;
423 struct ib_sge *tx_dsg;
424
425 itt = (__force uint32_t)hdr->itt;
426 data_seg_len = ntoh24(hdr->dlength);
427 buf_offset = ntohl(hdr->offset);
428
429 iser_dbg("%s itt %d dseg_len %d offset %d\n",
430 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
431
432 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
433 if (!tx_desc)
434 return -ENOMEM;
435
436 tx_desc->type = ISCSI_TX_DATAOUT;
437 tx_desc->cqe.done = iser_dataout_comp;
438 tx_desc->iser_header.flags = ISER_VER;
439 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
440
441 /* build the tx desc */
442 err = iser_initialize_task_headers(task, tx_desc);
443 if (err)
444 goto send_data_out_error;
445
446 mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT];
447 tx_dsg = &tx_desc->tx_sg[1];
448 tx_dsg->addr = mem_reg->sge.addr + buf_offset;
449 tx_dsg->length = data_seg_len;
450 tx_dsg->lkey = mem_reg->sge.lkey;
451 tx_desc->num_sge = 2;
452
453 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
454 iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n",
455 buf_offset, data_seg_len,
456 iser_task->data[ISER_DIR_OUT].data_len, itt);
457 err = -EINVAL;
458 goto send_data_out_error;
459 }
460 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
461 itt, buf_offset, data_seg_len);
462
463 err = iser_post_send(&iser_conn->ib_conn, tx_desc);
464 if (!err)
465 return 0;
466
467send_data_out_error:
468 kmem_cache_free(ig.desc_cache, tx_desc);
469 iser_err("conn %p failed err %d\n", conn, err);
470 return err;
471}
472
473int iser_send_control(struct iscsi_conn *conn, struct iscsi_task *task)
474{
475 struct iser_conn *iser_conn = conn->dd_data;
476 struct iscsi_iser_task *iser_task = task->dd_data;
477 struct iser_tx_desc *mdesc = &iser_task->desc;
478 unsigned long data_seg_len;
479 int err = 0;
480 struct iser_device *device;
481
482 /* build the tx desc regd header and add it to the tx desc dto */
483 iser_create_send_desc(iser_conn, mdesc, ISCSI_TX_CONTROL,
484 iser_ctrl_comp);
485
486 device = iser_conn->ib_conn.device;
487
488 data_seg_len = ntoh24(task->hdr->dlength);
489
490 if (data_seg_len > 0) {
491 struct iser_login_desc *desc = &iser_conn->login_desc;
492 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
493
494 if (task != conn->login_task) {
495 iser_err("data present on non login task!!!\n");
496 goto send_control_error;
497 }
498
499 ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma,
500 task->data_count, DMA_TO_DEVICE);
501
502 memcpy(desc->req, task->data, task->data_count);
503
504 ib_dma_sync_single_for_device(device->ib_device, desc->req_dma,
505 task->data_count, DMA_TO_DEVICE);
506
507 tx_dsg->addr = desc->req_dma;
508 tx_dsg->length = task->data_count;
509 tx_dsg->lkey = device->pd->local_dma_lkey;
510 mdesc->num_sge = 2;
511 }
512
513 if (task == conn->login_task) {
514 iser_dbg("op %x dsl %lx, posting login rx buffer\n",
515 task->hdr->opcode, data_seg_len);
516 err = iser_post_recvl(iser_conn);
517 if (err)
518 goto send_control_error;
519 err = iser_post_rx_bufs(conn, task->hdr);
520 if (err)
521 goto send_control_error;
522 }
523
524 err = iser_post_send(&iser_conn->ib_conn, mdesc);
525 if (!err)
526 return 0;
527
528send_control_error:
529 iser_err("conn %p failed err %d\n",conn, err);
530 return err;
531}
532
533void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc)
534{
535 struct ib_conn *ib_conn = wc->qp->qp_context;
536 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
537 struct iser_login_desc *desc = iser_login(wc->wr_cqe);
538 struct iscsi_hdr *hdr;
539 char *data;
540 int length;
541 bool full_feature_phase;
542
543 if (unlikely(wc->status != IB_WC_SUCCESS)) {
544 iser_err_comp(wc, "login_rsp");
545 return;
546 }
547
548 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
549 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
550 DMA_FROM_DEVICE);
551
552 hdr = desc->rsp + sizeof(struct iser_ctrl);
553 data = desc->rsp + ISER_HEADERS_LEN;
554 length = wc->byte_len - ISER_HEADERS_LEN;
555 full_feature_phase = ((hdr->flags & ISCSI_FULL_FEATURE_PHASE) ==
556 ISCSI_FULL_FEATURE_PHASE) &&
557 (hdr->flags & ISCSI_FLAG_CMD_FINAL);
558
559 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
560 hdr->itt, length);
561
562 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length);
563
564 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
565 desc->rsp_dma, ISER_RX_LOGIN_SIZE,
566 DMA_FROM_DEVICE);
567
568 if (!full_feature_phase ||
569 iser_conn->iscsi_conn->session->discovery_sess)
570 return;
571
572 /* Post the first RX buffer that is skipped in iser_post_rx_bufs() */
573 iser_post_recvm(iser_conn, iser_conn->rx_descs);
574}
575
576static inline int iser_inv_desc(struct iser_fr_desc *desc, u32 rkey)
577{
578 if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) ||
579 (desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) {
580 iser_err("Bogus remote invalidation for rkey %#x\n", rkey);
581 return -EINVAL;
582 }
583
584 if (desc->sig_protected)
585 desc->rsc.sig_mr->need_inval = false;
586 else
587 desc->rsc.mr->need_inval = false;
588
589 return 0;
590}
591
592static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
593 struct iscsi_hdr *hdr)
594{
595 if (wc->wc_flags & IB_WC_WITH_INVALIDATE) {
596 struct iscsi_task *task;
597 u32 rkey = wc->ex.invalidate_rkey;
598
599 iser_dbg("conn %p: remote invalidation for rkey %#x\n",
600 iser_conn, rkey);
601
602 if (unlikely(!iser_conn->snd_w_inv)) {
603 iser_err("conn %p: unexpected remote invalidation, terminating connection\n",
604 iser_conn);
605 return -EPROTO;
606 }
607
608 task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt);
609 if (likely(task)) {
610 struct iscsi_iser_task *iser_task = task->dd_data;
611 struct iser_fr_desc *desc;
612
613 if (iser_task->dir[ISER_DIR_IN]) {
614 desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
615 if (unlikely(iser_inv_desc(desc, rkey)))
616 return -EINVAL;
617 }
618
619 if (iser_task->dir[ISER_DIR_OUT]) {
620 desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
621 if (unlikely(iser_inv_desc(desc, rkey)))
622 return -EINVAL;
623 }
624 } else {
625 iser_err("failed to get task for itt=%d\n", hdr->itt);
626 return -EINVAL;
627 }
628 }
629
630 return 0;
631}
632
633
634void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc)
635{
636 struct ib_conn *ib_conn = wc->qp->qp_context;
637 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
638 struct iser_rx_desc *desc = iser_rx(wc->wr_cqe);
639 struct iscsi_hdr *hdr;
640 int length, err;
641
642 if (unlikely(wc->status != IB_WC_SUCCESS)) {
643 iser_err_comp(wc, "task_rsp");
644 return;
645 }
646
647 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device,
648 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
649 DMA_FROM_DEVICE);
650
651 hdr = &desc->iscsi_header;
652 length = wc->byte_len - ISER_HEADERS_LEN;
653
654 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
655 hdr->itt, length);
656
657 if (iser_check_remote_inv(iser_conn, wc, hdr)) {
658 iscsi_conn_failure(iser_conn->iscsi_conn,
659 ISCSI_ERR_CONN_FAILED);
660 return;
661 }
662
663 iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length);
664
665 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
666 desc->dma_addr, ISER_RX_PAYLOAD_SIZE,
667 DMA_FROM_DEVICE);
668
669 err = iser_post_recvm(iser_conn, desc);
670 if (err)
671 iser_err("posting rx buffer err %d\n", err);
672}
673
674void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc)
675{
676 if (unlikely(wc->status != IB_WC_SUCCESS))
677 iser_err_comp(wc, "command");
678}
679
680void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
681{
682 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
683 struct iscsi_task *task;
684
685 if (unlikely(wc->status != IB_WC_SUCCESS)) {
686 iser_err_comp(wc, "control");
687 return;
688 }
689
690 /* this arithmetic is legal by libiscsi dd_data allocation */
691 task = (void *)desc - sizeof(struct iscsi_task);
692 if (task->hdr->itt == RESERVED_ITT)
693 iscsi_put_task(task);
694}
695
696void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc)
697{
698 struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
699 struct ib_conn *ib_conn = wc->qp->qp_context;
700 struct iser_device *device = ib_conn->device;
701
702 if (unlikely(wc->status != IB_WC_SUCCESS))
703 iser_err_comp(wc, "dataout");
704
705 ib_dma_unmap_single(device->ib_device, desc->dma_addr,
706 ISER_HEADERS_LEN, DMA_TO_DEVICE);
707 kmem_cache_free(ig.desc_cache, desc);
708}
709
710void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
711
712{
713 iser_task->status = ISER_TASK_STATUS_INIT;
714
715 iser_task->dir[ISER_DIR_IN] = 0;
716 iser_task->dir[ISER_DIR_OUT] = 0;
717
718 iser_task->data[ISER_DIR_IN].data_len = 0;
719 iser_task->data[ISER_DIR_OUT].data_len = 0;
720
721 iser_task->prot[ISER_DIR_IN].data_len = 0;
722 iser_task->prot[ISER_DIR_OUT].data_len = 0;
723
724 iser_task->prot[ISER_DIR_IN].dma_nents = 0;
725 iser_task->prot[ISER_DIR_OUT].dma_nents = 0;
726
727 memset(&iser_task->rdma_reg[ISER_DIR_IN], 0,
728 sizeof(struct iser_mem_reg));
729 memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0,
730 sizeof(struct iser_mem_reg));
731}
732
733void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
734{
735
736 if (iser_task->dir[ISER_DIR_IN]) {
737 iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN);
738 iser_dma_unmap_task_data(iser_task, ISER_DIR_IN,
739 DMA_FROM_DEVICE);
740 }
741
742 if (iser_task->dir[ISER_DIR_OUT]) {
743 iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT);
744 iser_dma_unmap_task_data(iser_task, ISER_DIR_OUT,
745 DMA_TO_DEVICE);
746 }
747}
1/*
2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32#include <linux/kernel.h>
33#include <linux/slab.h>
34#include <linux/mm.h>
35#include <linux/scatterlist.h>
36#include <linux/kfifo.h>
37#include <scsi/scsi_cmnd.h>
38#include <scsi/scsi_host.h>
39
40#include "iscsi_iser.h"
41
42/* Register user buffer memory and initialize passive rdma
43 * dto descriptor. Total data size is stored in
44 * iser_task->data[ISER_DIR_IN].data_len
45 */
46static int iser_prepare_read_cmd(struct iscsi_task *task,
47 unsigned int edtl)
48
49{
50 struct iscsi_iser_task *iser_task = task->dd_data;
51 struct iser_regd_buf *regd_buf;
52 int err;
53 struct iser_hdr *hdr = &iser_task->desc.iser_header;
54 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
55
56 err = iser_dma_map_task_data(iser_task,
57 buf_in,
58 ISER_DIR_IN,
59 DMA_FROM_DEVICE);
60 if (err)
61 return err;
62
63 if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
64 iser_err("Total data length: %ld, less than EDTL: "
65 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
66 iser_task->data[ISER_DIR_IN].data_len, edtl,
67 task->itt, iser_task->iser_conn);
68 return -EINVAL;
69 }
70
71 err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN);
72 if (err) {
73 iser_err("Failed to set up Data-IN RDMA\n");
74 return err;
75 }
76 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
77
78 hdr->flags |= ISER_RSV;
79 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
80 hdr->read_va = cpu_to_be64(regd_buf->reg.va);
81
82 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
83 task->itt, regd_buf->reg.rkey,
84 (unsigned long long)regd_buf->reg.va);
85
86 return 0;
87}
88
89/* Register user buffer memory and initialize passive rdma
90 * dto descriptor. Total data size is stored in
91 * task->data[ISER_DIR_OUT].data_len
92 */
93static int
94iser_prepare_write_cmd(struct iscsi_task *task,
95 unsigned int imm_sz,
96 unsigned int unsol_sz,
97 unsigned int edtl)
98{
99 struct iscsi_iser_task *iser_task = task->dd_data;
100 struct iser_regd_buf *regd_buf;
101 int err;
102 struct iser_hdr *hdr = &iser_task->desc.iser_header;
103 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
104 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
105
106 err = iser_dma_map_task_data(iser_task,
107 buf_out,
108 ISER_DIR_OUT,
109 DMA_TO_DEVICE);
110 if (err)
111 return err;
112
113 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
114 iser_err("Total data length: %ld, less than EDTL: %d, "
115 "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
116 iser_task->data[ISER_DIR_OUT].data_len,
117 edtl, task->itt, task->conn);
118 return -EINVAL;
119 }
120
121 err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT);
122 if (err != 0) {
123 iser_err("Failed to register write cmd RDMA mem\n");
124 return err;
125 }
126
127 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
128
129 if (unsol_sz < edtl) {
130 hdr->flags |= ISER_WSV;
131 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
132 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
133
134 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
135 "VA:%#llX + unsol:%d\n",
136 task->itt, regd_buf->reg.rkey,
137 (unsigned long long)regd_buf->reg.va, unsol_sz);
138 }
139
140 if (imm_sz > 0) {
141 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
142 task->itt, imm_sz);
143 tx_dsg->addr = regd_buf->reg.va;
144 tx_dsg->length = imm_sz;
145 tx_dsg->lkey = regd_buf->reg.lkey;
146 iser_task->desc.num_sge = 2;
147 }
148
149 return 0;
150}
151
152/* creates a new tx descriptor and adds header regd buffer */
153static void iser_create_send_desc(struct iser_conn *ib_conn,
154 struct iser_tx_desc *tx_desc)
155{
156 struct iser_device *device = ib_conn->device;
157
158 ib_dma_sync_single_for_cpu(device->ib_device,
159 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
160
161 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
162 tx_desc->iser_header.flags = ISER_VER;
163
164 tx_desc->num_sge = 1;
165
166 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
167 tx_desc->tx_sg[0].lkey = device->mr->lkey;
168 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
169 }
170}
171
172
173int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
174{
175 int i, j;
176 u64 dma_addr;
177 struct iser_rx_desc *rx_desc;
178 struct ib_sge *rx_sg;
179 struct iser_device *device = ib_conn->device;
180
181 ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
182 sizeof(struct iser_rx_desc), GFP_KERNEL);
183 if (!ib_conn->rx_descs)
184 goto rx_desc_alloc_fail;
185
186 rx_desc = ib_conn->rx_descs;
187
188 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) {
189 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
190 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
191 if (ib_dma_mapping_error(device->ib_device, dma_addr))
192 goto rx_desc_dma_map_failed;
193
194 rx_desc->dma_addr = dma_addr;
195
196 rx_sg = &rx_desc->rx_sg;
197 rx_sg->addr = rx_desc->dma_addr;
198 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
199 rx_sg->lkey = device->mr->lkey;
200 }
201
202 ib_conn->rx_desc_head = 0;
203 return 0;
204
205rx_desc_dma_map_failed:
206 rx_desc = ib_conn->rx_descs;
207 for (j = 0; j < i; j++, rx_desc++)
208 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
210 kfree(ib_conn->rx_descs);
211 ib_conn->rx_descs = NULL;
212rx_desc_alloc_fail:
213 iser_err("failed allocating rx descriptors / data buffers\n");
214 return -ENOMEM;
215}
216
217void iser_free_rx_descriptors(struct iser_conn *ib_conn)
218{
219 int i;
220 struct iser_rx_desc *rx_desc;
221 struct iser_device *device = ib_conn->device;
222
223 if (!ib_conn->rx_descs)
224 return;
225
226 rx_desc = ib_conn->rx_descs;
227 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
228 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
229 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
230 kfree(ib_conn->rx_descs);
231}
232
233static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
234{
235 struct iscsi_iser_conn *iser_conn = conn->dd_data;
236
237 iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
238 /* check if this is the last login - going to full feature phase */
239 if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
240 return 0;
241
242 /*
243 * Check that there is one posted recv buffer (for the last login
244 * response) and no posted send buffers left - they must have been
245 * consumed during previous login phases.
246 */
247 WARN_ON(iser_conn->ib_conn->post_recv_buf_count != 1);
248 WARN_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
249
250 iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
251 /* Initial post receive buffers */
252 if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
253 return -ENOMEM;
254
255 return 0;
256}
257
258/**
259 * iser_send_command - send command PDU
260 */
261int iser_send_command(struct iscsi_conn *conn,
262 struct iscsi_task *task)
263{
264 struct iscsi_iser_conn *iser_conn = conn->dd_data;
265 struct iscsi_iser_task *iser_task = task->dd_data;
266 unsigned long edtl;
267 int err;
268 struct iser_data_buf *data_buf;
269 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
270 struct scsi_cmnd *sc = task->sc;
271 struct iser_tx_desc *tx_desc = &iser_task->desc;
272
273 edtl = ntohl(hdr->data_length);
274
275 /* build the tx desc regd header and add it to the tx desc dto */
276 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
277 iser_create_send_desc(iser_conn->ib_conn, tx_desc);
278
279 if (hdr->flags & ISCSI_FLAG_CMD_READ)
280 data_buf = &iser_task->data[ISER_DIR_IN];
281 else
282 data_buf = &iser_task->data[ISER_DIR_OUT];
283
284 if (scsi_sg_count(sc)) { /* using a scatter list */
285 data_buf->buf = scsi_sglist(sc);
286 data_buf->size = scsi_sg_count(sc);
287 }
288
289 data_buf->data_len = scsi_bufflen(sc);
290
291 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
292 err = iser_prepare_read_cmd(task, edtl);
293 if (err)
294 goto send_command_error;
295 }
296 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
297 err = iser_prepare_write_cmd(task,
298 task->imm_count,
299 task->imm_count +
300 task->unsol_r2t.data_length,
301 edtl);
302 if (err)
303 goto send_command_error;
304 }
305
306 iser_task->status = ISER_TASK_STATUS_STARTED;
307
308 err = iser_post_send(iser_conn->ib_conn, tx_desc);
309 if (!err)
310 return 0;
311
312send_command_error:
313 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
314 return err;
315}
316
317/**
318 * iser_send_data_out - send data out PDU
319 */
320int iser_send_data_out(struct iscsi_conn *conn,
321 struct iscsi_task *task,
322 struct iscsi_data *hdr)
323{
324 struct iscsi_iser_conn *iser_conn = conn->dd_data;
325 struct iscsi_iser_task *iser_task = task->dd_data;
326 struct iser_tx_desc *tx_desc = NULL;
327 struct iser_regd_buf *regd_buf;
328 unsigned long buf_offset;
329 unsigned long data_seg_len;
330 uint32_t itt;
331 int err = 0;
332 struct ib_sge *tx_dsg;
333
334 itt = (__force uint32_t)hdr->itt;
335 data_seg_len = ntoh24(hdr->dlength);
336 buf_offset = ntohl(hdr->offset);
337
338 iser_dbg("%s itt %d dseg_len %d offset %d\n",
339 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
340
341 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
342 if (tx_desc == NULL) {
343 iser_err("Failed to alloc desc for post dataout\n");
344 return -ENOMEM;
345 }
346
347 tx_desc->type = ISCSI_TX_DATAOUT;
348 tx_desc->iser_header.flags = ISER_VER;
349 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
350
351 /* build the tx desc */
352 iser_initialize_task_headers(task, tx_desc);
353
354 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
355 tx_dsg = &tx_desc->tx_sg[1];
356 tx_dsg->addr = regd_buf->reg.va + buf_offset;
357 tx_dsg->length = data_seg_len;
358 tx_dsg->lkey = regd_buf->reg.lkey;
359 tx_desc->num_sge = 2;
360
361 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
362 iser_err("Offset:%ld & DSL:%ld in Data-Out "
363 "inconsistent with total len:%ld, itt:%d\n",
364 buf_offset, data_seg_len,
365 iser_task->data[ISER_DIR_OUT].data_len, itt);
366 err = -EINVAL;
367 goto send_data_out_error;
368 }
369 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
370 itt, buf_offset, data_seg_len);
371
372
373 err = iser_post_send(iser_conn->ib_conn, tx_desc);
374 if (!err)
375 return 0;
376
377send_data_out_error:
378 kmem_cache_free(ig.desc_cache, tx_desc);
379 iser_err("conn %p failed err %d\n",conn, err);
380 return err;
381}
382
383int iser_send_control(struct iscsi_conn *conn,
384 struct iscsi_task *task)
385{
386 struct iscsi_iser_conn *iser_conn = conn->dd_data;
387 struct iscsi_iser_task *iser_task = task->dd_data;
388 struct iser_tx_desc *mdesc = &iser_task->desc;
389 unsigned long data_seg_len;
390 int err = 0;
391 struct iser_device *device;
392 struct iser_conn *ib_conn = iser_conn->ib_conn;
393
394 /* build the tx desc regd header and add it to the tx desc dto */
395 mdesc->type = ISCSI_TX_CONTROL;
396 iser_create_send_desc(iser_conn->ib_conn, mdesc);
397
398 device = iser_conn->ib_conn->device;
399
400 data_seg_len = ntoh24(task->hdr->dlength);
401
402 if (data_seg_len > 0) {
403 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
404 if (task != conn->login_task) {
405 iser_err("data present on non login task!!!\n");
406 goto send_control_error;
407 }
408
409 ib_dma_sync_single_for_cpu(device->ib_device,
410 ib_conn->login_req_dma, task->data_count,
411 DMA_TO_DEVICE);
412
413 memcpy(iser_conn->ib_conn->login_req_buf, task->data,
414 task->data_count);
415
416 ib_dma_sync_single_for_device(device->ib_device,
417 ib_conn->login_req_dma, task->data_count,
418 DMA_TO_DEVICE);
419
420 tx_dsg->addr = iser_conn->ib_conn->login_req_dma;
421 tx_dsg->length = task->data_count;
422 tx_dsg->lkey = device->mr->lkey;
423 mdesc->num_sge = 2;
424 }
425
426 if (task == conn->login_task) {
427 err = iser_post_recvl(iser_conn->ib_conn);
428 if (err)
429 goto send_control_error;
430 err = iser_post_rx_bufs(conn, task->hdr);
431 if (err)
432 goto send_control_error;
433 }
434
435 err = iser_post_send(iser_conn->ib_conn, mdesc);
436 if (!err)
437 return 0;
438
439send_control_error:
440 iser_err("conn %p failed err %d\n",conn, err);
441 return err;
442}
443
444/**
445 * iser_rcv_dto_completion - recv DTO completion
446 */
447void iser_rcv_completion(struct iser_rx_desc *rx_desc,
448 unsigned long rx_xfer_len,
449 struct iser_conn *ib_conn)
450{
451 struct iscsi_iser_conn *conn = ib_conn->iser_conn;
452 struct iscsi_hdr *hdr;
453 u64 rx_dma;
454 int rx_buflen, outstanding, count, err;
455
456 /* differentiate between login to all other PDUs */
457 if ((char *)rx_desc == ib_conn->login_resp_buf) {
458 rx_dma = ib_conn->login_resp_dma;
459 rx_buflen = ISER_RX_LOGIN_SIZE;
460 } else {
461 rx_dma = rx_desc->dma_addr;
462 rx_buflen = ISER_RX_PAYLOAD_SIZE;
463 }
464
465 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
466 rx_buflen, DMA_FROM_DEVICE);
467
468 hdr = &rx_desc->iscsi_header;
469
470 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
471 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
472
473 iscsi_iser_recv(conn->iscsi_conn, hdr,
474 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
475
476 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
477 rx_buflen, DMA_FROM_DEVICE);
478
479 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
480 * task eliminates the need to worry on tasks which are completed in *
481 * parallel to the execution of iser_conn_term. So the code that waits *
482 * for the posted rx bufs refcount to become zero handles everything */
483 conn->ib_conn->post_recv_buf_count--;
484
485 if (rx_dma == ib_conn->login_resp_dma)
486 return;
487
488 outstanding = ib_conn->post_recv_buf_count;
489 if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
490 count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
491 ISER_MIN_POSTED_RX);
492 err = iser_post_recvm(ib_conn, count);
493 if (err)
494 iser_err("posting %d rx bufs err %d\n", count, err);
495 }
496}
497
498void iser_snd_completion(struct iser_tx_desc *tx_desc,
499 struct iser_conn *ib_conn)
500{
501 struct iscsi_task *task;
502 struct iser_device *device = ib_conn->device;
503
504 if (tx_desc->type == ISCSI_TX_DATAOUT) {
505 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
506 ISER_HEADERS_LEN, DMA_TO_DEVICE);
507 kmem_cache_free(ig.desc_cache, tx_desc);
508 }
509
510 atomic_dec(&ib_conn->post_send_buf_count);
511
512 if (tx_desc->type == ISCSI_TX_CONTROL) {
513 /* this arithmetic is legal by libiscsi dd_data allocation */
514 task = (void *) ((long)(void *)tx_desc -
515 sizeof(struct iscsi_task));
516 if (task->hdr->itt == RESERVED_ITT)
517 iscsi_put_task(task);
518 }
519}
520
521void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
522
523{
524 iser_task->status = ISER_TASK_STATUS_INIT;
525
526 iser_task->dir[ISER_DIR_IN] = 0;
527 iser_task->dir[ISER_DIR_OUT] = 0;
528
529 iser_task->data[ISER_DIR_IN].data_len = 0;
530 iser_task->data[ISER_DIR_OUT].data_len = 0;
531
532 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
533 sizeof(struct iser_regd_buf));
534 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
535 sizeof(struct iser_regd_buf));
536}
537
538void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
539{
540 int is_rdma_aligned = 1;
541 struct iser_regd_buf *regd;
542
543 /* if we were reading, copy back to unaligned sglist,
544 * anyway dma_unmap and free the copy
545 */
546 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
547 is_rdma_aligned = 0;
548 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
549 }
550 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
551 is_rdma_aligned = 0;
552 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
553 }
554
555 if (iser_task->dir[ISER_DIR_IN]) {
556 regd = &iser_task->rdma_regd[ISER_DIR_IN];
557 if (regd->reg.is_fmr)
558 iser_unreg_mem(®d->reg);
559 }
560
561 if (iser_task->dir[ISER_DIR_OUT]) {
562 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
563 if (regd->reg.is_fmr)
564 iser_unreg_mem(®d->reg);
565 }
566
567 /* if the data was unaligned, it was already unmapped and then copied */
568 if (is_rdma_aligned)
569 iser_dma_unmap_task_data(iser_task);
570}