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 /* Constant PDU lengths calculations */
43 #define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
44 sizeof (struct iscsi_hdr))
45
46 /* iser_dto_add_regd_buff - increments the reference count for *
47 * the registered buffer & adds it to the DTO object */
48 static void iser_dto_add_regd_buff(struct iser_dto *dto,
49 struct iser_regd_buf *regd_buf,
50 unsigned long use_offset,
51 unsigned long use_size)
52 {
53 int add_idx;
54
55 atomic_inc(®d_buf->ref_count);
56
57 add_idx = dto->regd_vector_len;
58 dto->regd[add_idx] = regd_buf;
59 dto->used_sz[add_idx] = use_size;
60 dto->offset[add_idx] = use_offset;
61
62 dto->regd_vector_len++;
63 }
64
65 /* Register user buffer memory and initialize passive rdma
66 * dto descriptor. Total data size is stored in
67 * iser_task->data[ISER_DIR_IN].data_len
68 */
69 static int iser_prepare_read_cmd(struct iscsi_task *task,
70 unsigned int edtl)
71
72 {
73 struct iscsi_iser_task *iser_task = task->dd_data;
74 struct iser_regd_buf *regd_buf;
75 int err;
76 struct iser_hdr *hdr = &iser_task->desc.iser_header;
77 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
78
79 err = iser_dma_map_task_data(iser_task,
80 buf_in,
81 ISER_DIR_IN,
82 DMA_FROM_DEVICE);
83 if (err)
84 return err;
85
86 if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
87 iser_err("Total data length: %ld, less than EDTL: "
88 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
89 iser_task->data[ISER_DIR_IN].data_len, edtl,
90 task->itt, iser_task->iser_conn);
91 return -EINVAL;
92 }
93
94 err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN);
95 if (err) {
96 iser_err("Failed to set up Data-IN RDMA\n");
97 return err;
98 }
99 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
100
101 hdr->flags |= ISER_RSV;
102 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
103 hdr->read_va = cpu_to_be64(regd_buf->reg.va);
104
105 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
106 task->itt, regd_buf->reg.rkey,
107 (unsigned long long)regd_buf->reg.va);
108
109 return 0;
110 }
111
112 /* Register user buffer memory and initialize passive rdma
113 * dto descriptor. Total data size is stored in
114 * task->data[ISER_DIR_OUT].data_len
115 */
116 static int
117 iser_prepare_write_cmd(struct iscsi_task *task,
118 unsigned int imm_sz,
119 unsigned int unsol_sz,
120 unsigned int edtl)
121 {
122 struct iscsi_iser_task *iser_task = task->dd_data;
123 struct iser_regd_buf *regd_buf;
124 int err;
125 struct iser_dto *send_dto = &iser_task->desc.dto;
126 struct iser_hdr *hdr = &iser_task->desc.iser_header;
127 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
128
129 err = iser_dma_map_task_data(iser_task,
130 buf_out,
131 ISER_DIR_OUT,
132 DMA_TO_DEVICE);
133 if (err)
134 return err;
135
136 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
137 iser_err("Total data length: %ld, less than EDTL: %d, "
138 "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
139 iser_task->data[ISER_DIR_OUT].data_len,
140 edtl, task->itt, task->conn);
141 return -EINVAL;
142 }
143
144 err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT);
145 if (err != 0) {
146 iser_err("Failed to register write cmd RDMA mem\n");
147 return err;
148 }
149
150 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
151
152 if (unsol_sz < edtl) {
153 hdr->flags |= ISER_WSV;
154 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
155 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
156
157 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
158 "VA:%#llX + unsol:%d\n",
159 task->itt, regd_buf->reg.rkey,
160 (unsigned long long)regd_buf->reg.va, unsol_sz);
161 }
162
163 if (imm_sz > 0) {
164 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
165 task->itt, imm_sz);
166 iser_dto_add_regd_buff(send_dto,
167 regd_buf,
168 0,
169 imm_sz);
170 }
171
172 return 0;
173 }
174
175 /**
176 * iser_post_receive_control - allocates, initializes and posts receive DTO.
177 */
178 static int iser_post_receive_control(struct iscsi_conn *conn)
179 {
180 struct iscsi_iser_conn *iser_conn = conn->dd_data;
181 struct iser_desc *rx_desc;
182 struct iser_regd_buf *regd_hdr;
183 struct iser_regd_buf *regd_data;
184 struct iser_dto *recv_dto = NULL;
185 struct iser_device *device = iser_conn->ib_conn->device;
186 int rx_data_size, err;
187 int posts, outstanding_unexp_pdus;
188
189 /* for the login sequence we must support rx of upto 8K; login is done
190 * after conn create/bind (connect) and conn stop/bind (reconnect),
191 * what's common for both schemes is that the connection is not started
192 */
193 if (conn->c_stage != ISCSI_CONN_STARTED)
194 rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN;
195 else /* FIXME till user space sets conn->max_recv_dlength correctly */
196 rx_data_size = 128;
197
198 outstanding_unexp_pdus =
199 atomic_xchg(&iser_conn->ib_conn->unexpected_pdu_count, 0);
200
201 /*
202 * in addition to the response buffer, replace those consumed by
203 * unexpected pdus.
204 */
205 for (posts = 0; posts < 1 + outstanding_unexp_pdus; posts++) {
206 rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
207 if (rx_desc == NULL) {
208 iser_err("Failed to alloc desc for post recv %d\n",
209 posts);
210 err = -ENOMEM;
211 goto post_rx_cache_alloc_failure;
212 }
213 rx_desc->type = ISCSI_RX;
214 rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
215 if (rx_desc->data == NULL) {
216 iser_err("Failed to alloc data buf for post recv %d\n",
217 posts);
218 err = -ENOMEM;
219 goto post_rx_kmalloc_failure;
220 }
221
222 recv_dto = &rx_desc->dto;
223 recv_dto->ib_conn = iser_conn->ib_conn;
224 recv_dto->regd_vector_len = 0;
225
226 regd_hdr = &rx_desc->hdr_regd_buf;
227 memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
228 regd_hdr->device = device;
229 regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
230 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
231
232 iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
233
234 iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
235
236 regd_data = &rx_desc->data_regd_buf;
237 memset(regd_data, 0, sizeof(struct iser_regd_buf));
238 regd_data->device = device;
239 regd_data->virt_addr = rx_desc->data;
240 regd_data->data_size = rx_data_size;
241
242 iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
243
244 iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
245
246 err = iser_post_recv(rx_desc);
247 if (err) {
248 iser_err("Failed iser_post_recv for post %d\n", posts);
249 goto post_rx_post_recv_failure;
250 }
251 }
252 /* all posts successful */
253 return 0;
254
255 post_rx_post_recv_failure:
256 iser_dto_buffs_release(recv_dto);
257 kfree(rx_desc->data);
258 post_rx_kmalloc_failure:
259 kmem_cache_free(ig.desc_cache, rx_desc);
260 post_rx_cache_alloc_failure:
261 if (posts > 0) {
262 /*
263 * response buffer posted, but did not replace all unexpected
264 * pdu recv bufs. Ignore error, retry occurs next send
265 */
266 outstanding_unexp_pdus -= (posts - 1);
267 err = 0;
268 }
269 atomic_add(outstanding_unexp_pdus,
270 &iser_conn->ib_conn->unexpected_pdu_count);
271
272 return err;
273 }
274
275 /* creates a new tx descriptor and adds header regd buffer */
276 static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
277 struct iser_desc *tx_desc)
278 {
279 struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
280 struct iser_dto *send_dto = &tx_desc->dto;
281
282 memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
283 regd_hdr->device = iser_conn->ib_conn->device;
284 regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
285 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
286
287 send_dto->ib_conn = iser_conn->ib_conn;
288 send_dto->notify_enable = 1;
289 send_dto->regd_vector_len = 0;
290
291 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
292 tx_desc->iser_header.flags = ISER_VER;
293
294 iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
295 }
296
297 /**
298 * iser_conn_set_full_featured_mode - (iSER API)
299 */
300 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
301 {
302 struct iscsi_iser_conn *iser_conn = conn->dd_data;
303
304 int i;
305 /*
306 * FIXME this value should be declared to the target during login with
307 * the MaxOutstandingUnexpectedPDUs key when supported
308 */
309 int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
310
311 iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
312
313 /* Check that there is no posted recv or send buffers left - */
314 /* they must be consumed during the login phase */
315 BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
316 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
317
318 /* Initial post receive buffers */
319 for (i = 0; i < initial_post_recv_bufs_num; i++) {
320 if (iser_post_receive_control(conn) != 0) {
321 iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
322 i, conn);
323 return -ENOMEM;
324 }
325 }
326 iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
327 return 0;
328 }
329
330 static int
331 iser_check_xmit(struct iscsi_conn *conn, void *task)
332 {
333 struct iscsi_iser_conn *iser_conn = conn->dd_data;
334
335 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
336 ISER_QP_MAX_REQ_DTOS) {
337 iser_dbg("%ld can't xmit task %p\n",jiffies,task);
338 return -ENOBUFS;
339 }
340 return 0;
341 }
342
343
344 /**
345 * iser_send_command - send command PDU
346 */
347 int iser_send_command(struct iscsi_conn *conn,
348 struct iscsi_task *task)
349 {
350 struct iscsi_iser_conn *iser_conn = conn->dd_data;
351 struct iscsi_iser_task *iser_task = task->dd_data;
352 struct iser_dto *send_dto = NULL;
353 unsigned long edtl;
354 int err = 0;
355 struct iser_data_buf *data_buf;
356 struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr;
357 struct scsi_cmnd *sc = task->sc;
358
359 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
360 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
361 return -EPERM;
362 }
363 if (iser_check_xmit(conn, task))
364 return -ENOBUFS;
365
366 edtl = ntohl(hdr->data_length);
367
368 /* build the tx desc regd header and add it to the tx desc dto */
369 iser_task->desc.type = ISCSI_TX_SCSI_COMMAND;
370 send_dto = &iser_task->desc.dto;
371 send_dto->task = iser_task;
372 iser_create_send_desc(iser_conn, &iser_task->desc);
373
374 if (hdr->flags & ISCSI_FLAG_CMD_READ)
375 data_buf = &iser_task->data[ISER_DIR_IN];
376 else
377 data_buf = &iser_task->data[ISER_DIR_OUT];
378
379 if (scsi_sg_count(sc)) { /* using a scatter list */
380 data_buf->buf = scsi_sglist(sc);
381 data_buf->size = scsi_sg_count(sc);
382 }
383
384 data_buf->data_len = scsi_bufflen(sc);
385
386 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
387 err = iser_prepare_read_cmd(task, edtl);
388 if (err)
389 goto send_command_error;
390 }
391 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
392 err = iser_prepare_write_cmd(task,
393 task->imm_count,
394 task->imm_count +
395 task->unsol_r2t.data_length,
396 edtl);
397 if (err)
398 goto send_command_error;
399 }
400
401 iser_reg_single(iser_conn->ib_conn->device,
402 send_dto->regd[0], DMA_TO_DEVICE);
403
404 if (iser_post_receive_control(conn) != 0) {
405 iser_err("post_recv failed!\n");
406 err = -ENOMEM;
407 goto send_command_error;
408 }
409
410 iser_task->status = ISER_TASK_STATUS_STARTED;
411
412 err = iser_post_send(&iser_task->desc);
413 if (!err)
414 return 0;
415
416 send_command_error:
417 iser_dto_buffs_release(send_dto);
418 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
419 return err;
420 }
421
422 /**
423 * iser_send_data_out - send data out PDU
424 */
425 int iser_send_data_out(struct iscsi_conn *conn,
426 struct iscsi_task *task,
427 struct iscsi_data *hdr)
428 {
429 struct iscsi_iser_conn *iser_conn = conn->dd_data;
430 struct iscsi_iser_task *iser_task = task->dd_data;
431 struct iser_desc *tx_desc = NULL;
432 struct iser_dto *send_dto = NULL;
433 unsigned long buf_offset;
434 unsigned long data_seg_len;
435 uint32_t itt;
436 int err = 0;
437
438 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
439 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
440 return -EPERM;
441 }
442
443 if (iser_check_xmit(conn, task))
444 return -ENOBUFS;
445
446 itt = (__force uint32_t)hdr->itt;
447 data_seg_len = ntoh24(hdr->dlength);
448 buf_offset = ntohl(hdr->offset);
449
450 iser_dbg("%s itt %d dseg_len %d offset %d\n",
451 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
452
453 tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
454 if (tx_desc == NULL) {
455 iser_err("Failed to alloc desc for post dataout\n");
456 return -ENOMEM;
457 }
458
459 tx_desc->type = ISCSI_TX_DATAOUT;
460 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
461
462 /* build the tx desc regd header and add it to the tx desc dto */
463 send_dto = &tx_desc->dto;
464 send_dto->task = iser_task;
465 iser_create_send_desc(iser_conn, tx_desc);
466
467 iser_reg_single(iser_conn->ib_conn->device,
468 send_dto->regd[0], DMA_TO_DEVICE);
469
470 /* all data was registered for RDMA, we can use the lkey */
471 iser_dto_add_regd_buff(send_dto,
472 &iser_task->rdma_regd[ISER_DIR_OUT],
473 buf_offset,
474 data_seg_len);
475
476 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
477 iser_err("Offset:%ld & DSL:%ld in Data-Out "
478 "inconsistent with total len:%ld, itt:%d\n",
479 buf_offset, data_seg_len,
480 iser_task->data[ISER_DIR_OUT].data_len, itt);
481 err = -EINVAL;
482 goto send_data_out_error;
483 }
484 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
485 itt, buf_offset, data_seg_len);
486
487
488 err = iser_post_send(tx_desc);
489 if (!err)
490 return 0;
491
492 send_data_out_error:
493 iser_dto_buffs_release(send_dto);
494 kmem_cache_free(ig.desc_cache, tx_desc);
495 iser_err("conn %p failed err %d\n",conn, err);
496 return err;
497 }
498
499 int iser_send_control(struct iscsi_conn *conn,
500 struct iscsi_task *task)
501 {
502 struct iscsi_iser_conn *iser_conn = conn->dd_data;
503 struct iscsi_iser_task *iser_task = task->dd_data;
504 struct iser_desc *mdesc = &iser_task->desc;
505 struct iser_dto *send_dto = NULL;
506 unsigned long data_seg_len;
507 int err = 0;
508 struct iser_regd_buf *regd_buf;
509 struct iser_device *device;
510 unsigned char opcode;
511
512 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
513 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
514 return -EPERM;
515 }
516
517 if (iser_check_xmit(conn, task))
518 return -ENOBUFS;
519
520 /* build the tx desc regd header and add it to the tx desc dto */
521 mdesc->type = ISCSI_TX_CONTROL;
522 send_dto = &mdesc->dto;
523 send_dto->task = NULL;
524 iser_create_send_desc(iser_conn, mdesc);
525
526 device = iser_conn->ib_conn->device;
527
528 iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
529
530 data_seg_len = ntoh24(task->hdr->dlength);
531
532 if (data_seg_len > 0) {
533 regd_buf = &mdesc->data_regd_buf;
534 memset(regd_buf, 0, sizeof(struct iser_regd_buf));
535 regd_buf->device = device;
536 regd_buf->virt_addr = task->data;
537 regd_buf->data_size = task->data_count;
538 iser_reg_single(device, regd_buf,
539 DMA_TO_DEVICE);
540 iser_dto_add_regd_buff(send_dto, regd_buf,
541 0,
542 data_seg_len);
543 }
544
545 opcode = task->hdr->opcode & ISCSI_OPCODE_MASK;
546
547 /* post recv buffer for response if one is expected */
548 if (!(opcode == ISCSI_OP_NOOP_OUT && task->hdr->itt == RESERVED_ITT)) {
549 if (iser_post_receive_control(conn) != 0) {
550 iser_err("post_rcv_buff failed!\n");
551 err = -ENOMEM;
552 goto send_control_error;
553 }
554 }
555
556 err = iser_post_send(mdesc);
557 if (!err)
558 return 0;
559
560 send_control_error:
561 iser_dto_buffs_release(send_dto);
562 iser_err("conn %p failed err %d\n",conn, err);
563 return err;
564 }
565
566 /**
567 * iser_rcv_dto_completion - recv DTO completion
568 */
569 void iser_rcv_completion(struct iser_desc *rx_desc,
570 unsigned long dto_xfer_len)
571 {
572 struct iser_dto *dto = &rx_desc->dto;
573 struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn;
574 struct iscsi_task *task;
575 struct iscsi_iser_task *iser_task;
576 struct iscsi_hdr *hdr;
577 char *rx_data = NULL;
578 int rx_data_len = 0;
579 unsigned char opcode;
580
581 hdr = &rx_desc->iscsi_header;
582
583 iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
584
585 if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
586 rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
587 rx_data = dto->regd[1]->virt_addr;
588 rx_data += dto->offset[1];
589 }
590
591 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
592
593 if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
594 spin_lock(&conn->iscsi_conn->session->lock);
595 task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt);
596 if (task)
597 __iscsi_get_task(task);
598 spin_unlock(&conn->iscsi_conn->session->lock);
599
600 if (!task)
601 iser_err("itt can't be matched to task!!! "
602 "conn %p opcode %d itt %d\n",
603 conn->iscsi_conn, opcode, hdr->itt);
604 else {
605 iser_task = task->dd_data;
606 iser_dbg("itt %d task %p\n",hdr->itt, task);
607 iser_task->status = ISER_TASK_STATUS_COMPLETED;
608 iser_task_rdma_finalize(iser_task);
609 iscsi_put_task(task);
610 }
611 }
612 iser_dto_buffs_release(dto);
613
614 iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
615
616 kfree(rx_desc->data);
617 kmem_cache_free(ig.desc_cache, rx_desc);
618
619 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
620 * task eliminates the need to worry on tasks which are completed in *
621 * parallel to the execution of iser_conn_term. So the code that waits *
622 * for the posted rx bufs refcount to become zero handles everything */
623 atomic_dec(&conn->ib_conn->post_recv_buf_count);
624
625 /*
626 * if an unexpected PDU was received then the recv wr consumed must
627 * be replaced, this is done in the next send of a control-type PDU
628 */
629 if (opcode == ISCSI_OP_NOOP_IN && hdr->itt == RESERVED_ITT) {
630 /* nop-in with itt = 0xffffffff */
631 atomic_inc(&conn->ib_conn->unexpected_pdu_count);
632 }
633 else if (opcode == ISCSI_OP_ASYNC_EVENT) {
634 /* asyncronous message */
635 atomic_inc(&conn->ib_conn->unexpected_pdu_count);
636 }
637 /* a reject PDU consumes the recv buf posted for the response */
638 }
639
640 void iser_snd_completion(struct iser_desc *tx_desc)
641 {
642 struct iser_dto *dto = &tx_desc->dto;
643 struct iser_conn *ib_conn = dto->ib_conn;
644 struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn;
645 struct iscsi_conn *conn = iser_conn->iscsi_conn;
646 struct iscsi_task *task;
647 int resume_tx = 0;
648
649 iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
650
651 iser_dto_buffs_release(dto);
652
653 if (tx_desc->type == ISCSI_TX_DATAOUT)
654 kmem_cache_free(ig.desc_cache, tx_desc);
655
656 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
657 ISER_QP_MAX_REQ_DTOS)
658 resume_tx = 1;
659
660 atomic_dec(&ib_conn->post_send_buf_count);
661
662 if (resume_tx) {
663 iser_dbg("%ld resuming tx\n",jiffies);
664 iscsi_conn_queue_work(conn);
665 }
666
667 if (tx_desc->type == ISCSI_TX_CONTROL) {
668 /* this arithmetic is legal by libiscsi dd_data allocation */
669 task = (void *) ((long)(void *)tx_desc -
670 sizeof(struct iscsi_task));
671 if (task->hdr->itt == RESERVED_ITT)
672 iscsi_put_task(task);
673 }
674 }
675
676 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
677
678 {
679 iser_task->status = ISER_TASK_STATUS_INIT;
680
681 iser_task->dir[ISER_DIR_IN] = 0;
682 iser_task->dir[ISER_DIR_OUT] = 0;
683
684 iser_task->data[ISER_DIR_IN].data_len = 0;
685 iser_task->data[ISER_DIR_OUT].data_len = 0;
686
687 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
688 sizeof(struct iser_regd_buf));
689 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
690 sizeof(struct iser_regd_buf));
691 }
692
693 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
694 {
695 int deferred;
696 int is_rdma_aligned = 1;
697 struct iser_regd_buf *regd;
698
699 /* if we were reading, copy back to unaligned sglist,
700 * anyway dma_unmap and free the copy
701 */
702 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
703 is_rdma_aligned = 0;
704 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
705 }
706 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
707 is_rdma_aligned = 0;
708 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
709 }
710
711 if (iser_task->dir[ISER_DIR_IN]) {
712 regd = &iser_task->rdma_regd[ISER_DIR_IN];
713 deferred = iser_regd_buff_release(regd);
714 if (deferred) {
715 iser_err("%d references remain for BUF-IN rdma reg\n",
716 atomic_read(®d->ref_count));
717 }
718 }
719
720 if (iser_task->dir[ISER_DIR_OUT]) {
721 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
722 deferred = iser_regd_buff_release(regd);
723 if (deferred) {
724 iser_err("%d references remain for BUF-OUT rdma reg\n",
725 atomic_read(®d->ref_count));
726 }
727 }
728
729 /* if the data was unaligned, it was already unmapped and then copied */
730 if (is_rdma_aligned)
731 iser_dma_unmap_task_data(iser_task);
732 }
733
734 void iser_dto_buffs_release(struct iser_dto *dto)
735 {
736 int i;
737
738 for (i = 0; i < dto->regd_vector_len; i++)
739 iser_regd_buff_release(dto->regd[i]);
740 }
741
742
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