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