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authorOr Gerlitz <ogerlitz@voltaire.com>2006-05-11 03:02:19 -0400
committerRoland Dreier <rolandd@cisco.com>2006-06-22 10:51:09 -0400
commite85b24b5e7de9f507c6253183d089370f37618c5 (patch)
treeba56462012733f1a99f95e6a3dc5123abb24407f /drivers/infiniband
parent65e7ae7bfc71219f13162b3bbad44e6471cd67f9 (diff)
IB/iser: iSER initiator iSCSI PDU and TX/RX
This file contains the iSER initiator processing of iSCSI PDUs - controls, commands and data-outs along with processing of TX and RX completions. It interacts with the lower level iser code doing the memory registration and and the cma and verbs calls. Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/iser/iser_initiator.c738
1 files changed, 738 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c
new file mode 100644
index 000000000000..ccf56f6f7236
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_initiator.c
@@ -0,0 +1,738 @@
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 * $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $
33 */
34#include <linux/kernel.h>
35#include <linux/slab.h>
36#include <linux/mm.h>
37#include <asm/io.h>
38#include <asm/scatterlist.h>
39#include <linux/scatterlist.h>
40#include <linux/kfifo.h>
41#include <scsi/scsi_cmnd.h>
42#include <scsi/scsi_host.h>
43
44#include "iscsi_iser.h"
45
46/* Constant PDU lengths calculations */
47#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
48 sizeof (struct iscsi_hdr))
49
50/* iser_dto_add_regd_buff - increments the reference count for *
51 * the registered buffer & adds it to the DTO object */
52static void iser_dto_add_regd_buff(struct iser_dto *dto,
53 struct iser_regd_buf *regd_buf,
54 unsigned long use_offset,
55 unsigned long use_size)
56{
57 int add_idx;
58
59 atomic_inc(&regd_buf->ref_count);
60
61 add_idx = dto->regd_vector_len;
62 dto->regd[add_idx] = regd_buf;
63 dto->used_sz[add_idx] = use_size;
64 dto->offset[add_idx] = use_offset;
65
66 dto->regd_vector_len++;
67}
68
69static int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
70 struct iser_data_buf *data,
71 enum iser_data_dir iser_dir,
72 enum dma_data_direction dma_dir)
73{
74 struct device *dma_device;
75
76 iser_ctask->dir[iser_dir] = 1;
77 dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
78
79 data->dma_nents = dma_map_sg(dma_device, data->buf, data->size, dma_dir);
80 if (data->dma_nents == 0) {
81 iser_err("dma_map_sg failed!!!\n");
82 return -EINVAL;
83 }
84 return 0;
85}
86
87static void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask)
88{
89 struct device *dma_device;
90 struct iser_data_buf *data;
91
92 dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
93
94 if (iser_ctask->dir[ISER_DIR_IN]) {
95 data = &iser_ctask->data[ISER_DIR_IN];
96 dma_unmap_sg(dma_device, data->buf, data->size, DMA_FROM_DEVICE);
97 }
98
99 if (iser_ctask->dir[ISER_DIR_OUT]) {
100 data = &iser_ctask->data[ISER_DIR_OUT];
101 dma_unmap_sg(dma_device, data->buf, data->size, DMA_TO_DEVICE);
102 }
103}
104
105/* Register user buffer memory and initialize passive rdma
106 * dto descriptor. Total data size is stored in
107 * iser_ctask->data[ISER_DIR_IN].data_len
108 */
109static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask,
110 unsigned int edtl)
111
112{
113 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
114 struct iser_regd_buf *regd_buf;
115 int err;
116 struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
117 struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN];
118
119 err = iser_dma_map_task_data(iser_ctask,
120 buf_in,
121 ISER_DIR_IN,
122 DMA_FROM_DEVICE);
123 if (err)
124 return err;
125
126 if (edtl > iser_ctask->data[ISER_DIR_IN].data_len) {
127 iser_err("Total data length: %ld, less than EDTL: "
128 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
129 iser_ctask->data[ISER_DIR_IN].data_len, edtl,
130 ctask->itt, iser_ctask->iser_conn);
131 return -EINVAL;
132 }
133
134 err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_IN);
135 if (err) {
136 iser_err("Failed to set up Data-IN RDMA\n");
137 return err;
138 }
139 regd_buf = &iser_ctask->rdma_regd[ISER_DIR_IN];
140
141 hdr->flags |= ISER_RSV;
142 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
143 hdr->read_va = cpu_to_be64(regd_buf->reg.va);
144
145 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
146 ctask->itt, regd_buf->reg.rkey,
147 (unsigned long long)regd_buf->reg.va);
148
149 return 0;
150}
151
152/* Register user buffer memory and initialize passive rdma
153 * dto descriptor. Total data size is stored in
154 * ctask->data[ISER_DIR_OUT].data_len
155 */
156static int
157iser_prepare_write_cmd(struct iscsi_cmd_task *ctask,
158 unsigned int imm_sz,
159 unsigned int unsol_sz,
160 unsigned int edtl)
161{
162 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
163 struct iser_regd_buf *regd_buf;
164 int err;
165 struct iser_dto *send_dto = &iser_ctask->desc.dto;
166 struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
167 struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT];
168
169 err = iser_dma_map_task_data(iser_ctask,
170 buf_out,
171 ISER_DIR_OUT,
172 DMA_TO_DEVICE);
173 if (err)
174 return err;
175
176 if (edtl > iser_ctask->data[ISER_DIR_OUT].data_len) {
177 iser_err("Total data length: %ld, less than EDTL: %d, "
178 "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
179 iser_ctask->data[ISER_DIR_OUT].data_len,
180 edtl, ctask->itt, ctask->conn);
181 return -EINVAL;
182 }
183
184 err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_OUT);
185 if (err != 0) {
186 iser_err("Failed to register write cmd RDMA mem\n");
187 return err;
188 }
189
190 regd_buf = &iser_ctask->rdma_regd[ISER_DIR_OUT];
191
192 if (unsol_sz < edtl) {
193 hdr->flags |= ISER_WSV;
194 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
195 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
196
197 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
198 "VA:%#llX + unsol:%d\n",
199 ctask->itt, regd_buf->reg.rkey,
200 (unsigned long long)regd_buf->reg.va, unsol_sz);
201 }
202
203 if (imm_sz > 0) {
204 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
205 ctask->itt, imm_sz);
206 iser_dto_add_regd_buff(send_dto,
207 regd_buf,
208 0,
209 imm_sz);
210 }
211
212 return 0;
213}
214
215/**
216 * iser_post_receive_control - allocates, initializes and posts receive DTO.
217 */
218static int iser_post_receive_control(struct iscsi_conn *conn)
219{
220 struct iscsi_iser_conn *iser_conn = conn->dd_data;
221 struct iser_desc *rx_desc;
222 struct iser_regd_buf *regd_hdr;
223 struct iser_regd_buf *regd_data;
224 struct iser_dto *recv_dto = NULL;
225 struct iser_device *device = iser_conn->ib_conn->device;
226 int rx_data_size, err = 0;
227
228 rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
229 if (rx_desc == NULL) {
230 iser_err("Failed to alloc desc for post recv\n");
231 return -ENOMEM;
232 }
233 rx_desc->type = ISCSI_RX;
234
235 /* for the login sequence we must support rx of upto 8K; login is done
236 * after conn create/bind (connect) and conn stop/bind (reconnect),
237 * what's common for both schemes is that the connection is not started
238 */
239 if (conn->c_stage != ISCSI_CONN_STARTED)
240 rx_data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
241 else /* FIXME till user space sets conn->max_recv_dlength correctly */
242 rx_data_size = 128;
243
244 rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
245 if (rx_desc->data == NULL) {
246 iser_err("Failed to alloc data buf for post recv\n");
247 err = -ENOMEM;
248 goto post_rx_kmalloc_failure;
249 }
250
251 recv_dto = &rx_desc->dto;
252 recv_dto->conn = iser_conn;
253 recv_dto->regd_vector_len = 0;
254
255 regd_hdr = &rx_desc->hdr_regd_buf;
256 memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
257 regd_hdr->device = device;
258 regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
259 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
260
261 iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
262
263 iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
264
265 regd_data = &rx_desc->data_regd_buf;
266 memset(regd_data, 0, sizeof(struct iser_regd_buf));
267 regd_data->device = device;
268 regd_data->virt_addr = rx_desc->data;
269 regd_data->data_size = rx_data_size;
270
271 iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
272
273 iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
274
275 err = iser_post_recv(rx_desc);
276 if (!err)
277 return 0;
278
279 /* iser_post_recv failed */
280 iser_dto_buffs_release(recv_dto);
281 kfree(rx_desc->data);
282post_rx_kmalloc_failure:
283 kmem_cache_free(ig.desc_cache, rx_desc);
284 return err;
285}
286
287/* creates a new tx descriptor and adds header regd buffer */
288static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
289 struct iser_desc *tx_desc)
290{
291 struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
292 struct iser_dto *send_dto = &tx_desc->dto;
293
294 memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
295 regd_hdr->device = iser_conn->ib_conn->device;
296 regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
297 regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
298
299 send_dto->conn = iser_conn;
300 send_dto->notify_enable = 1;
301 send_dto->regd_vector_len = 0;
302
303 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
304 tx_desc->iser_header.flags = ISER_VER;
305
306 iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
307}
308
309/**
310 * iser_conn_set_full_featured_mode - (iSER API)
311 */
312int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
313{
314 struct iscsi_iser_conn *iser_conn = conn->dd_data;
315
316 int i;
317 /* no need to keep it in a var, we are after login so if this should
318 * be negotiated, by now the result should be available here */
319 int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
320
321 iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
322
323 /* Check that there is no posted recv or send buffers left - */
324 /* they must be consumed during the login phase */
325 BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
326 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
327
328 /* Initial post receive buffers */
329 for (i = 0; i < initial_post_recv_bufs_num; i++) {
330 if (iser_post_receive_control(conn) != 0) {
331 iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
332 i, conn);
333 return -ENOMEM;
334 }
335 }
336 iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
337 return 0;
338}
339
340static int
341iser_check_xmit(struct iscsi_conn *conn, void *task)
342{
343 int rc = 0;
344 struct iscsi_iser_conn *iser_conn = conn->dd_data;
345
346 write_lock_bh(conn->recv_lock);
347 if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
348 ISER_QP_MAX_REQ_DTOS) {
349 iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task);
350 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
351 rc = -EAGAIN;
352 }
353 write_unlock_bh(conn->recv_lock);
354 return rc;
355}
356
357
358/**
359 * iser_send_command - send command PDU
360 */
361int iser_send_command(struct iscsi_conn *conn,
362 struct iscsi_cmd_task *ctask)
363{
364 struct iscsi_iser_conn *iser_conn = conn->dd_data;
365 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
366 struct iser_dto *send_dto = NULL;
367 unsigned long edtl;
368 int err = 0;
369 struct iser_data_buf *data_buf;
370
371 struct iscsi_cmd *hdr = ctask->hdr;
372 struct scsi_cmnd *sc = ctask->sc;
373
374 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
375 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
376 return -EPERM;
377 }
378 if (iser_check_xmit(conn, ctask))
379 return -EAGAIN;
380
381 edtl = ntohl(hdr->data_length);
382
383 /* build the tx desc regd header and add it to the tx desc dto */
384 iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND;
385 send_dto = &iser_ctask->desc.dto;
386 send_dto->ctask = iser_ctask;
387 iser_create_send_desc(iser_conn, &iser_ctask->desc);
388
389 if (hdr->flags & ISCSI_FLAG_CMD_READ)
390 data_buf = &iser_ctask->data[ISER_DIR_IN];
391 else
392 data_buf = &iser_ctask->data[ISER_DIR_OUT];
393
394 if (sc->use_sg) { /* using a scatter list */
395 data_buf->buf = sc->request_buffer;
396 data_buf->size = sc->use_sg;
397 } else if (sc->request_bufflen) {
398 /* using a single buffer - convert it into one entry SG */
399 sg_init_one(&data_buf->sg_single,
400 sc->request_buffer, sc->request_bufflen);
401 data_buf->buf = &data_buf->sg_single;
402 data_buf->size = 1;
403 }
404
405 data_buf->data_len = sc->request_bufflen;
406
407 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
408 err = iser_prepare_read_cmd(ctask, edtl);
409 if (err)
410 goto send_command_error;
411 }
412 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
413 err = iser_prepare_write_cmd(ctask,
414 ctask->imm_count,
415 ctask->imm_count +
416 ctask->unsol_count,
417 edtl);
418 if (err)
419 goto send_command_error;
420 }
421
422 iser_reg_single(iser_conn->ib_conn->device,
423 send_dto->regd[0], DMA_TO_DEVICE);
424
425 if (iser_post_receive_control(conn) != 0) {
426 iser_err("post_recv failed!\n");
427 err = -ENOMEM;
428 goto send_command_error;
429 }
430
431 iser_ctask->status = ISER_TASK_STATUS_STARTED;
432
433 err = iser_post_send(&iser_ctask->desc);
434 if (!err)
435 return 0;
436
437send_command_error:
438 iser_dto_buffs_release(send_dto);
439 iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err);
440 return err;
441}
442
443/**
444 * iser_send_data_out - send data out PDU
445 */
446int iser_send_data_out(struct iscsi_conn *conn,
447 struct iscsi_cmd_task *ctask,
448 struct iscsi_data *hdr)
449{
450 struct iscsi_iser_conn *iser_conn = conn->dd_data;
451 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
452 struct iser_desc *tx_desc = NULL;
453 struct iser_dto *send_dto = NULL;
454 unsigned long buf_offset;
455 unsigned long data_seg_len;
456 unsigned int itt;
457 int err = 0;
458
459 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
460 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
461 return -EPERM;
462 }
463
464 if (iser_check_xmit(conn, ctask))
465 return -EAGAIN;
466
467 itt = ntohl(hdr->itt);
468 data_seg_len = ntoh24(hdr->dlength);
469 buf_offset = ntohl(hdr->offset);
470
471 iser_dbg("%s itt %d dseg_len %d offset %d\n",
472 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
473
474 tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
475 if (tx_desc == NULL) {
476 iser_err("Failed to alloc desc for post dataout\n");
477 return -ENOMEM;
478 }
479
480 tx_desc->type = ISCSI_TX_DATAOUT;
481 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
482
483 /* build the tx desc regd header and add it to the tx desc dto */
484 send_dto = &tx_desc->dto;
485 send_dto->ctask = iser_ctask;
486 iser_create_send_desc(iser_conn, tx_desc);
487
488 iser_reg_single(iser_conn->ib_conn->device,
489 send_dto->regd[0], DMA_TO_DEVICE);
490
491 /* all data was registered for RDMA, we can use the lkey */
492 iser_dto_add_regd_buff(send_dto,
493 &iser_ctask->rdma_regd[ISER_DIR_OUT],
494 buf_offset,
495 data_seg_len);
496
497 if (buf_offset + data_seg_len > iser_ctask->data[ISER_DIR_OUT].data_len) {
498 iser_err("Offset:%ld & DSL:%ld in Data-Out "
499 "inconsistent with total len:%ld, itt:%d\n",
500 buf_offset, data_seg_len,
501 iser_ctask->data[ISER_DIR_OUT].data_len, itt);
502 err = -EINVAL;
503 goto send_data_out_error;
504 }
505 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
506 itt, buf_offset, data_seg_len);
507
508
509 err = iser_post_send(tx_desc);
510 if (!err)
511 return 0;
512
513send_data_out_error:
514 iser_dto_buffs_release(send_dto);
515 kmem_cache_free(ig.desc_cache, tx_desc);
516 iser_err("conn %p failed err %d\n",conn, err);
517 return err;
518}
519
520int iser_send_control(struct iscsi_conn *conn,
521 struct iscsi_mgmt_task *mtask)
522{
523 struct iscsi_iser_conn *iser_conn = conn->dd_data;
524 struct iser_desc *mdesc = mtask->dd_data;
525 struct iser_dto *send_dto = NULL;
526 unsigned int itt;
527 unsigned long data_seg_len;
528 int err = 0;
529 unsigned char opcode;
530 struct iser_regd_buf *regd_buf;
531 struct iser_device *device;
532
533 if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
534 iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
535 return -EPERM;
536 }
537
538 if (iser_check_xmit(conn,mtask))
539 return -EAGAIN;
540
541 /* build the tx desc regd header and add it to the tx desc dto */
542 mdesc->type = ISCSI_TX_CONTROL;
543 send_dto = &mdesc->dto;
544 send_dto->ctask = NULL;
545 iser_create_send_desc(iser_conn, mdesc);
546
547 device = iser_conn->ib_conn->device;
548
549 iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
550
551 itt = ntohl(mtask->hdr->itt);
552 opcode = mtask->hdr->opcode & ISCSI_OPCODE_MASK;
553 data_seg_len = ntoh24(mtask->hdr->dlength);
554
555 if (data_seg_len > 0) {
556 regd_buf = &mdesc->data_regd_buf;
557 memset(regd_buf, 0, sizeof(struct iser_regd_buf));
558 regd_buf->device = device;
559 regd_buf->virt_addr = mtask->data;
560 regd_buf->data_size = mtask->data_count;
561 iser_reg_single(device, regd_buf,
562 DMA_TO_DEVICE);
563 iser_dto_add_regd_buff(send_dto, regd_buf,
564 0,
565 data_seg_len);
566 }
567
568 if (iser_post_receive_control(conn) != 0) {
569 iser_err("post_rcv_buff failed!\n");
570 err = -ENOMEM;
571 goto send_control_error;
572 }
573
574 err = iser_post_send(mdesc);
575 if (!err)
576 return 0;
577
578send_control_error:
579 iser_dto_buffs_release(send_dto);
580 iser_err("conn %p failed err %d\n",conn, err);
581 return err;
582}
583
584/**
585 * iser_rcv_dto_completion - recv DTO completion
586 */
587void iser_rcv_completion(struct iser_desc *rx_desc,
588 unsigned long dto_xfer_len)
589{
590 struct iser_dto *dto = &rx_desc->dto;
591 struct iscsi_iser_conn *conn = dto->conn;
592 struct iscsi_session *session = conn->iscsi_conn->session;
593 struct iscsi_cmd_task *ctask;
594 struct iscsi_iser_cmd_task *iser_ctask;
595 struct iscsi_hdr *hdr;
596 char *rx_data = NULL;
597 int rx_data_len = 0;
598 unsigned int itt;
599 unsigned char opcode;
600
601 hdr = &rx_desc->iscsi_header;
602
603 iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
604
605 if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
606 rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
607 rx_data = dto->regd[1]->virt_addr;
608 rx_data += dto->offset[1];
609 }
610
611 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
612
613 if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
614 itt = hdr->itt & ISCSI_ITT_MASK; /* mask out cid and age bits */
615 if (!(itt < session->cmds_max))
616 iser_err("itt can't be matched to task!!!"
617 "conn %p opcode %d cmds_max %d itt %d\n",
618 conn->iscsi_conn,opcode,session->cmds_max,itt);
619 /* use the mapping given with the cmds array indexed by itt */
620 ctask = (struct iscsi_cmd_task *)session->cmds[itt];
621 iser_ctask = ctask->dd_data;
622 iser_dbg("itt %d ctask %p\n",itt,ctask);
623 iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
624 iser_ctask_rdma_finalize(iser_ctask);
625 }
626
627 iser_dto_buffs_release(dto);
628
629 iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
630
631 kfree(rx_desc->data);
632 kmem_cache_free(ig.desc_cache, rx_desc);
633
634 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
635 * task eliminates the need to worry on tasks which are completed in *
636 * parallel to the execution of iser_conn_term. So the code that waits *
637 * for the posted rx bufs refcount to become zero handles everything */
638 atomic_dec(&conn->ib_conn->post_recv_buf_count);
639}
640
641void iser_snd_completion(struct iser_desc *tx_desc)
642{
643 struct iser_dto *dto = &tx_desc->dto;
644 struct iscsi_iser_conn *iser_conn = dto->conn;
645 struct iscsi_conn *conn = iser_conn->iscsi_conn;
646 struct iscsi_mgmt_task *mtask;
647
648 iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
649
650 iser_dto_buffs_release(dto);
651
652 if (tx_desc->type == ISCSI_TX_DATAOUT)
653 kmem_cache_free(ig.desc_cache, tx_desc);
654
655 atomic_dec(&iser_conn->ib_conn->post_send_buf_count);
656
657 write_lock(conn->recv_lock);
658 if (conn->suspend_tx) {
659 iser_dbg("%ld resuming tx\n",jiffies);
660 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
661 scsi_queue_work(conn->session->host, &conn->xmitwork);
662 }
663 write_unlock(conn->recv_lock);
664
665 if (tx_desc->type == ISCSI_TX_CONTROL) {
666 /* this arithmetic is legal by libiscsi dd_data allocation */
667 mtask = (void *) ((long)(void *)tx_desc -
668 sizeof(struct iscsi_mgmt_task));
669 if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
670 struct iscsi_session *session = conn->session;
671
672 spin_lock(&conn->session->lock);
673 list_del(&mtask->running);
674 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
675 sizeof(void*));
676 spin_unlock(&session->lock);
677 }
678 }
679}
680
681void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask)
682
683{
684 iser_ctask->status = ISER_TASK_STATUS_INIT;
685
686 iser_ctask->dir[ISER_DIR_IN] = 0;
687 iser_ctask->dir[ISER_DIR_OUT] = 0;
688
689 iser_ctask->data[ISER_DIR_IN].data_len = 0;
690 iser_ctask->data[ISER_DIR_OUT].data_len = 0;
691
692 memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0,
693 sizeof(struct iser_regd_buf));
694 memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0,
695 sizeof(struct iser_regd_buf));
696}
697
698void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask)
699{
700 int deferred;
701
702 /* if we were reading, copy back to unaligned sglist,
703 * anyway dma_unmap and free the copy
704 */
705 if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL)
706 iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN);
707 if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL)
708 iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT);
709
710 if (iser_ctask->dir[ISER_DIR_IN]) {
711 deferred = iser_regd_buff_release
712 (&iser_ctask->rdma_regd[ISER_DIR_IN]);
713 if (deferred) {
714 iser_err("References remain for BUF-IN rdma reg\n");
715 BUG();
716 }
717 }
718
719 if (iser_ctask->dir[ISER_DIR_OUT]) {
720 deferred = iser_regd_buff_release
721 (&iser_ctask->rdma_regd[ISER_DIR_OUT]);
722 if (deferred) {
723 iser_err("References remain for BUF-OUT rdma reg\n");
724 BUG();
725 }
726 }
727
728 iser_dma_unmap_task_data(iser_ctask);
729}
730
731void iser_dto_buffs_release(struct iser_dto *dto)
732{
733 int i;
734
735 for (i = 0; i < dto->regd_vector_len; i++)
736 iser_regd_buff_release(dto->regd[i]);
737}
738