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e85b24b5 OG |
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. | |
e85b24b5 OG |
31 | */ |
32 | #include <linux/kernel.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/mm.h> | |
e85b24b5 OG |
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 | ||
e85b24b5 OG |
65 | /* Register user buffer memory and initialize passive rdma |
66 | * dto descriptor. Total data size is stored in | |
2261ec3d | 67 | * iser_task->data[ISER_DIR_IN].data_len |
e85b24b5 | 68 | */ |
2261ec3d | 69 | static int iser_prepare_read_cmd(struct iscsi_task *task, |
e85b24b5 OG |
70 | unsigned int edtl) |
71 | ||
72 | { | |
2261ec3d | 73 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
74 | struct iser_regd_buf *regd_buf; |
75 | int err; | |
2261ec3d MC |
76 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
77 | struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; | |
e85b24b5 | 78 | |
2261ec3d | 79 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
80 | buf_in, |
81 | ISER_DIR_IN, | |
82 | DMA_FROM_DEVICE); | |
83 | if (err) | |
84 | return err; | |
85 | ||
2261ec3d | 86 | if (edtl > iser_task->data[ISER_DIR_IN].data_len) { |
e85b24b5 OG |
87 | iser_err("Total data length: %ld, less than EDTL: " |
88 | "%d, in READ cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
89 | iser_task->data[ISER_DIR_IN].data_len, edtl, |
90 | task->itt, iser_task->iser_conn); | |
e85b24b5 OG |
91 | return -EINVAL; |
92 | } | |
93 | ||
2261ec3d | 94 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN); |
e85b24b5 OG |
95 | if (err) { |
96 | iser_err("Failed to set up Data-IN RDMA\n"); | |
97 | return err; | |
98 | } | |
2261ec3d | 99 | regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; |
e85b24b5 OG |
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", | |
2261ec3d | 106 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
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 | |
2261ec3d | 114 | * task->data[ISER_DIR_OUT].data_len |
e85b24b5 OG |
115 | */ |
116 | static int | |
2261ec3d | 117 | iser_prepare_write_cmd(struct iscsi_task *task, |
e85b24b5 OG |
118 | unsigned int imm_sz, |
119 | unsigned int unsol_sz, | |
120 | unsigned int edtl) | |
121 | { | |
2261ec3d | 122 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
123 | struct iser_regd_buf *regd_buf; |
124 | int err; | |
2261ec3d MC |
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]; | |
e85b24b5 | 128 | |
2261ec3d | 129 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
130 | buf_out, |
131 | ISER_DIR_OUT, | |
132 | DMA_TO_DEVICE); | |
133 | if (err) | |
134 | return err; | |
135 | ||
2261ec3d | 136 | if (edtl > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
137 | iser_err("Total data length: %ld, less than EDTL: %d, " |
138 | "in WRITE cmd BHS itt: %d, conn: 0x%p\n", | |
2261ec3d MC |
139 | iser_task->data[ISER_DIR_OUT].data_len, |
140 | edtl, task->itt, task->conn); | |
e85b24b5 OG |
141 | return -EINVAL; |
142 | } | |
143 | ||
2261ec3d | 144 | err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT); |
e85b24b5 OG |
145 | if (err != 0) { |
146 | iser_err("Failed to register write cmd RDMA mem\n"); | |
147 | return err; | |
148 | } | |
149 | ||
2261ec3d | 150 | regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; |
e85b24b5 OG |
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", | |
2261ec3d | 159 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
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", | |
2261ec3d | 165 | task->itt, imm_sz); |
e85b24b5 OG |
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; | |
1cef4659 OG |
186 | int rx_data_size, err = 0; |
187 | ||
188 | rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); | |
189 | if (rx_desc == NULL) { | |
190 | iser_err("Failed to alloc desc for post recv\n"); | |
191 | return -ENOMEM; | |
192 | } | |
193 | rx_desc->type = ISCSI_RX; | |
e85b24b5 OG |
194 | |
195 | /* for the login sequence we must support rx of upto 8K; login is done | |
196 | * after conn create/bind (connect) and conn stop/bind (reconnect), | |
197 | * what's common for both schemes is that the connection is not started | |
198 | */ | |
199 | if (conn->c_stage != ISCSI_CONN_STARTED) | |
bf32ed33 | 200 | rx_data_size = ISCSI_DEF_MAX_RECV_SEG_LEN; |
e85b24b5 OG |
201 | else /* FIXME till user space sets conn->max_recv_dlength correctly */ |
202 | rx_data_size = 128; | |
203 | ||
1cef4659 OG |
204 | rx_desc->data = kmalloc(rx_data_size, GFP_NOIO); |
205 | if (rx_desc->data == NULL) { | |
206 | iser_err("Failed to alloc data buf for post recv\n"); | |
207 | err = -ENOMEM; | |
208 | goto post_rx_kmalloc_failure; | |
209 | } | |
e85b24b5 | 210 | |
1cef4659 OG |
211 | recv_dto = &rx_desc->dto; |
212 | recv_dto->ib_conn = iser_conn->ib_conn; | |
213 | recv_dto->regd_vector_len = 0; | |
e85b24b5 | 214 | |
1cef4659 OG |
215 | regd_hdr = &rx_desc->hdr_regd_buf; |
216 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); | |
217 | regd_hdr->device = device; | |
218 | regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */ | |
219 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; | |
e85b24b5 | 220 | |
1cef4659 | 221 | iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE); |
e85b24b5 | 222 | |
1cef4659 | 223 | iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0); |
e85b24b5 | 224 | |
1cef4659 OG |
225 | regd_data = &rx_desc->data_regd_buf; |
226 | memset(regd_data, 0, sizeof(struct iser_regd_buf)); | |
227 | regd_data->device = device; | |
228 | regd_data->virt_addr = rx_desc->data; | |
229 | regd_data->data_size = rx_data_size; | |
e85b24b5 | 230 | |
1cef4659 | 231 | iser_reg_single(device, regd_data, DMA_FROM_DEVICE); |
e85b24b5 | 232 | |
1cef4659 | 233 | iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0); |
e85b24b5 | 234 | |
1cef4659 OG |
235 | err = iser_post_recv(rx_desc); |
236 | if (!err) | |
237 | return 0; | |
bba7ebba | 238 | |
1cef4659 | 239 | /* iser_post_recv failed */ |
e85b24b5 OG |
240 | iser_dto_buffs_release(recv_dto); |
241 | kfree(rx_desc->data); | |
242 | post_rx_kmalloc_failure: | |
243 | kmem_cache_free(ig.desc_cache, rx_desc); | |
244 | return err; | |
245 | } | |
246 | ||
247 | /* creates a new tx descriptor and adds header regd buffer */ | |
248 | static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn, | |
249 | struct iser_desc *tx_desc) | |
250 | { | |
251 | struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf; | |
252 | struct iser_dto *send_dto = &tx_desc->dto; | |
253 | ||
254 | memset(regd_hdr, 0, sizeof(struct iser_regd_buf)); | |
255 | regd_hdr->device = iser_conn->ib_conn->device; | |
256 | regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */ | |
257 | regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN; | |
258 | ||
87e8df7a | 259 | send_dto->ib_conn = iser_conn->ib_conn; |
e85b24b5 OG |
260 | send_dto->notify_enable = 1; |
261 | send_dto->regd_vector_len = 0; | |
262 | ||
263 | memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); | |
264 | tx_desc->iser_header.flags = ISER_VER; | |
265 | ||
266 | iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0); | |
267 | } | |
268 | ||
269 | /** | |
270 | * iser_conn_set_full_featured_mode - (iSER API) | |
271 | */ | |
272 | int iser_conn_set_full_featured_mode(struct iscsi_conn *conn) | |
273 | { | |
274 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
275 | ||
276 | int i; | |
1cef4659 OG |
277 | /* no need to keep it in a var, we are after login so if this should |
278 | * be negotiated, by now the result should be available here */ | |
e85b24b5 OG |
279 | int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS; |
280 | ||
281 | iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num); | |
282 | ||
283 | /* Check that there is no posted recv or send buffers left - */ | |
284 | /* they must be consumed during the login phase */ | |
285 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0); | |
286 | BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0); | |
287 | ||
288 | /* Initial post receive buffers */ | |
289 | for (i = 0; i < initial_post_recv_bufs_num; i++) { | |
290 | if (iser_post_receive_control(conn) != 0) { | |
291 | iser_err("Failed to post recv bufs at:%d conn:0x%p\n", | |
292 | i, conn); | |
293 | return -ENOMEM; | |
294 | } | |
295 | } | |
296 | iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int | |
301 | iser_check_xmit(struct iscsi_conn *conn, void *task) | |
302 | { | |
e85b24b5 OG |
303 | struct iscsi_iser_conn *iser_conn = conn->dd_data; |
304 | ||
e85b24b5 OG |
305 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
306 | ISER_QP_MAX_REQ_DTOS) { | |
f0938401 EZ |
307 | iser_dbg("%ld can't xmit task %p\n",jiffies,task); |
308 | return -ENOBUFS; | |
e85b24b5 | 309 | } |
f0938401 | 310 | return 0; |
e85b24b5 OG |
311 | } |
312 | ||
313 | ||
314 | /** | |
315 | * iser_send_command - send command PDU | |
316 | */ | |
2747fdb2 | 317 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 318 | struct iscsi_task *task) |
e85b24b5 OG |
319 | { |
320 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 321 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
322 | struct iser_dto *send_dto = NULL; |
323 | unsigned long edtl; | |
324 | int err = 0; | |
325 | struct iser_data_buf *data_buf; | |
0f9c7449 | 326 | struct iscsi_cmd *hdr = (struct iscsi_cmd *)task->hdr; |
2261ec3d | 327 | struct scsi_cmnd *sc = task->sc; |
e85b24b5 OG |
328 | |
329 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
330 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
331 | return -EPERM; | |
332 | } | |
2261ec3d | 333 | if (iser_check_xmit(conn, task)) |
f0938401 | 334 | return -ENOBUFS; |
e85b24b5 OG |
335 | |
336 | edtl = ntohl(hdr->data_length); | |
337 | ||
338 | /* build the tx desc regd header and add it to the tx desc dto */ | |
2261ec3d MC |
339 | iser_task->desc.type = ISCSI_TX_SCSI_COMMAND; |
340 | send_dto = &iser_task->desc.dto; | |
341 | send_dto->task = iser_task; | |
342 | iser_create_send_desc(iser_conn, &iser_task->desc); | |
e85b24b5 OG |
343 | |
344 | if (hdr->flags & ISCSI_FLAG_CMD_READ) | |
2261ec3d | 345 | data_buf = &iser_task->data[ISER_DIR_IN]; |
e85b24b5 | 346 | else |
2261ec3d | 347 | data_buf = &iser_task->data[ISER_DIR_OUT]; |
e85b24b5 | 348 | |
da9c0c77 FT |
349 | if (scsi_sg_count(sc)) { /* using a scatter list */ |
350 | data_buf->buf = scsi_sglist(sc); | |
351 | data_buf->size = scsi_sg_count(sc); | |
e85b24b5 OG |
352 | } |
353 | ||
da9c0c77 | 354 | data_buf->data_len = scsi_bufflen(sc); |
e85b24b5 OG |
355 | |
356 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { | |
2261ec3d | 357 | err = iser_prepare_read_cmd(task, edtl); |
e85b24b5 OG |
358 | if (err) |
359 | goto send_command_error; | |
360 | } | |
361 | if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { | |
2261ec3d MC |
362 | err = iser_prepare_write_cmd(task, |
363 | task->imm_count, | |
364 | task->imm_count + | |
0f9c7449 | 365 | task->unsol_r2t.data_length, |
e85b24b5 OG |
366 | edtl); |
367 | if (err) | |
368 | goto send_command_error; | |
369 | } | |
370 | ||
371 | iser_reg_single(iser_conn->ib_conn->device, | |
372 | send_dto->regd[0], DMA_TO_DEVICE); | |
373 | ||
374 | if (iser_post_receive_control(conn) != 0) { | |
375 | iser_err("post_recv failed!\n"); | |
376 | err = -ENOMEM; | |
377 | goto send_command_error; | |
378 | } | |
379 | ||
2261ec3d | 380 | iser_task->status = ISER_TASK_STATUS_STARTED; |
e85b24b5 | 381 | |
2261ec3d | 382 | err = iser_post_send(&iser_task->desc); |
e85b24b5 OG |
383 | if (!err) |
384 | return 0; | |
385 | ||
386 | send_command_error: | |
387 | iser_dto_buffs_release(send_dto); | |
2261ec3d | 388 | iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); |
e85b24b5 OG |
389 | return err; |
390 | } | |
391 | ||
392 | /** | |
393 | * iser_send_data_out - send data out PDU | |
394 | */ | |
2747fdb2 | 395 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 396 | struct iscsi_task *task, |
e85b24b5 OG |
397 | struct iscsi_data *hdr) |
398 | { | |
399 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d | 400 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 OG |
401 | struct iser_desc *tx_desc = NULL; |
402 | struct iser_dto *send_dto = NULL; | |
403 | unsigned long buf_offset; | |
404 | unsigned long data_seg_len; | |
0a22ab92 | 405 | uint32_t itt; |
e85b24b5 OG |
406 | int err = 0; |
407 | ||
408 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
409 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
410 | return -EPERM; | |
411 | } | |
412 | ||
2261ec3d | 413 | if (iser_check_xmit(conn, task)) |
f0938401 | 414 | return -ENOBUFS; |
e85b24b5 | 415 | |
0a22ab92 | 416 | itt = (__force uint32_t)hdr->itt; |
e85b24b5 OG |
417 | data_seg_len = ntoh24(hdr->dlength); |
418 | buf_offset = ntohl(hdr->offset); | |
419 | ||
420 | iser_dbg("%s itt %d dseg_len %d offset %d\n", | |
421 | __func__,(int)itt,(int)data_seg_len,(int)buf_offset); | |
422 | ||
423 | tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO); | |
424 | if (tx_desc == NULL) { | |
425 | iser_err("Failed to alloc desc for post dataout\n"); | |
426 | return -ENOMEM; | |
427 | } | |
428 | ||
429 | tx_desc->type = ISCSI_TX_DATAOUT; | |
430 | memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); | |
431 | ||
432 | /* build the tx desc regd header and add it to the tx desc dto */ | |
433 | send_dto = &tx_desc->dto; | |
2261ec3d | 434 | send_dto->task = iser_task; |
e85b24b5 OG |
435 | iser_create_send_desc(iser_conn, tx_desc); |
436 | ||
437 | iser_reg_single(iser_conn->ib_conn->device, | |
438 | send_dto->regd[0], DMA_TO_DEVICE); | |
439 | ||
440 | /* all data was registered for RDMA, we can use the lkey */ | |
441 | iser_dto_add_regd_buff(send_dto, | |
2261ec3d | 442 | &iser_task->rdma_regd[ISER_DIR_OUT], |
e85b24b5 OG |
443 | buf_offset, |
444 | data_seg_len); | |
445 | ||
2261ec3d | 446 | if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
447 | iser_err("Offset:%ld & DSL:%ld in Data-Out " |
448 | "inconsistent with total len:%ld, itt:%d\n", | |
449 | buf_offset, data_seg_len, | |
2261ec3d | 450 | iser_task->data[ISER_DIR_OUT].data_len, itt); |
e85b24b5 OG |
451 | err = -EINVAL; |
452 | goto send_data_out_error; | |
453 | } | |
454 | iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", | |
455 | itt, buf_offset, data_seg_len); | |
456 | ||
457 | ||
458 | err = iser_post_send(tx_desc); | |
459 | if (!err) | |
460 | return 0; | |
461 | ||
462 | send_data_out_error: | |
463 | iser_dto_buffs_release(send_dto); | |
464 | kmem_cache_free(ig.desc_cache, tx_desc); | |
465 | iser_err("conn %p failed err %d\n",conn, err); | |
466 | return err; | |
467 | } | |
468 | ||
469 | int iser_send_control(struct iscsi_conn *conn, | |
2261ec3d | 470 | struct iscsi_task *task) |
e85b24b5 OG |
471 | { |
472 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
2261ec3d MC |
473 | struct iscsi_iser_task *iser_task = task->dd_data; |
474 | struct iser_desc *mdesc = &iser_task->desc; | |
e85b24b5 | 475 | struct iser_dto *send_dto = NULL; |
e85b24b5 OG |
476 | unsigned long data_seg_len; |
477 | int err = 0; | |
e85b24b5 OG |
478 | struct iser_regd_buf *regd_buf; |
479 | struct iser_device *device; | |
480 | ||
481 | if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) { | |
482 | iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn); | |
483 | return -EPERM; | |
484 | } | |
485 | ||
2261ec3d | 486 | if (iser_check_xmit(conn, task)) |
f0938401 | 487 | return -ENOBUFS; |
e85b24b5 OG |
488 | |
489 | /* build the tx desc regd header and add it to the tx desc dto */ | |
490 | mdesc->type = ISCSI_TX_CONTROL; | |
491 | send_dto = &mdesc->dto; | |
2261ec3d | 492 | send_dto->task = NULL; |
e85b24b5 OG |
493 | iser_create_send_desc(iser_conn, mdesc); |
494 | ||
495 | device = iser_conn->ib_conn->device; | |
496 | ||
497 | iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE); | |
498 | ||
2261ec3d | 499 | data_seg_len = ntoh24(task->hdr->dlength); |
e85b24b5 OG |
500 | |
501 | if (data_seg_len > 0) { | |
502 | regd_buf = &mdesc->data_regd_buf; | |
503 | memset(regd_buf, 0, sizeof(struct iser_regd_buf)); | |
504 | regd_buf->device = device; | |
2261ec3d MC |
505 | regd_buf->virt_addr = task->data; |
506 | regd_buf->data_size = task->data_count; | |
e85b24b5 OG |
507 | iser_reg_single(device, regd_buf, |
508 | DMA_TO_DEVICE); | |
509 | iser_dto_add_regd_buff(send_dto, regd_buf, | |
510 | 0, | |
511 | data_seg_len); | |
512 | } | |
513 | ||
1cef4659 OG |
514 | if (iser_post_receive_control(conn) != 0) { |
515 | iser_err("post_rcv_buff failed!\n"); | |
516 | err = -ENOMEM; | |
517 | goto send_control_error; | |
e85b24b5 OG |
518 | } |
519 | ||
520 | err = iser_post_send(mdesc); | |
521 | if (!err) | |
522 | return 0; | |
523 | ||
524 | send_control_error: | |
525 | iser_dto_buffs_release(send_dto); | |
526 | iser_err("conn %p failed err %d\n",conn, err); | |
527 | return err; | |
528 | } | |
529 | ||
530 | /** | |
531 | * iser_rcv_dto_completion - recv DTO completion | |
532 | */ | |
533 | void iser_rcv_completion(struct iser_desc *rx_desc, | |
534 | unsigned long dto_xfer_len) | |
535 | { | |
2747fdb2 | 536 | struct iser_dto *dto = &rx_desc->dto; |
87e8df7a | 537 | struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn; |
2261ec3d MC |
538 | struct iscsi_task *task; |
539 | struct iscsi_iser_task *iser_task; | |
e85b24b5 OG |
540 | struct iscsi_hdr *hdr; |
541 | char *rx_data = NULL; | |
542 | int rx_data_len = 0; | |
e85b24b5 OG |
543 | unsigned char opcode; |
544 | ||
545 | hdr = &rx_desc->iscsi_header; | |
546 | ||
547 | iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt); | |
548 | ||
549 | if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */ | |
550 | rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN; | |
551 | rx_data = dto->regd[1]->virt_addr; | |
552 | rx_data += dto->offset[1]; | |
553 | } | |
554 | ||
555 | opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
556 | ||
557 | if (opcode == ISCSI_OP_SCSI_CMD_RSP) { | |
913e5bf4 | 558 | spin_lock(&conn->iscsi_conn->session->lock); |
2261ec3d | 559 | task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt); |
913e5bf4 MC |
560 | if (task) |
561 | __iscsi_get_task(task); | |
562 | spin_unlock(&conn->iscsi_conn->session->lock); | |
563 | ||
2261ec3d | 564 | if (!task) |
908cf9a5 | 565 | iser_err("itt can't be matched to task!!! " |
0af967f5 MC |
566 | "conn %p opcode %d itt %d\n", |
567 | conn->iscsi_conn, opcode, hdr->itt); | |
568 | else { | |
2261ec3d MC |
569 | iser_task = task->dd_data; |
570 | iser_dbg("itt %d task %p\n",hdr->itt, task); | |
571 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
572 | iser_task_rdma_finalize(iser_task); | |
913e5bf4 | 573 | iscsi_put_task(task); |
0af967f5 | 574 | } |
e85b24b5 | 575 | } |
e85b24b5 OG |
576 | iser_dto_buffs_release(dto); |
577 | ||
578 | iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len); | |
579 | ||
580 | kfree(rx_desc->data); | |
581 | kmem_cache_free(ig.desc_cache, rx_desc); | |
582 | ||
583 | /* decrementing conn->post_recv_buf_count only --after-- freeing the * | |
584 | * task eliminates the need to worry on tasks which are completed in * | |
585 | * parallel to the execution of iser_conn_term. So the code that waits * | |
586 | * for the posted rx bufs refcount to become zero handles everything */ | |
587 | atomic_dec(&conn->ib_conn->post_recv_buf_count); | |
588 | } | |
589 | ||
590 | void iser_snd_completion(struct iser_desc *tx_desc) | |
591 | { | |
592 | struct iser_dto *dto = &tx_desc->dto; | |
87e8df7a EZ |
593 | struct iser_conn *ib_conn = dto->ib_conn; |
594 | struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn; | |
e85b24b5 | 595 | struct iscsi_conn *conn = iser_conn->iscsi_conn; |
2261ec3d | 596 | struct iscsi_task *task; |
f0938401 | 597 | int resume_tx = 0; |
e85b24b5 OG |
598 | |
599 | iser_dbg("Initiator, Data sent dto=0x%p\n", dto); | |
600 | ||
601 | iser_dto_buffs_release(dto); | |
602 | ||
603 | if (tx_desc->type == ISCSI_TX_DATAOUT) | |
604 | kmem_cache_free(ig.desc_cache, tx_desc); | |
605 | ||
f0938401 EZ |
606 | if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) == |
607 | ISER_QP_MAX_REQ_DTOS) | |
608 | resume_tx = 1; | |
609 | ||
87e8df7a | 610 | atomic_dec(&ib_conn->post_send_buf_count); |
e85b24b5 | 611 | |
f0938401 | 612 | if (resume_tx) { |
e85b24b5 | 613 | iser_dbg("%ld resuming tx\n",jiffies); |
32ae763e | 614 | iscsi_conn_queue_work(conn); |
e85b24b5 | 615 | } |
e85b24b5 OG |
616 | |
617 | if (tx_desc->type == ISCSI_TX_CONTROL) { | |
618 | /* this arithmetic is legal by libiscsi dd_data allocation */ | |
2261ec3d MC |
619 | task = (void *) ((long)(void *)tx_desc - |
620 | sizeof(struct iscsi_task)); | |
621 | if (task->hdr->itt == RESERVED_ITT) | |
622 | iscsi_put_task(task); | |
e85b24b5 OG |
623 | } |
624 | } | |
625 | ||
2261ec3d | 626 | void iser_task_rdma_init(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
627 | |
628 | { | |
2261ec3d | 629 | iser_task->status = ISER_TASK_STATUS_INIT; |
e85b24b5 | 630 | |
2261ec3d MC |
631 | iser_task->dir[ISER_DIR_IN] = 0; |
632 | iser_task->dir[ISER_DIR_OUT] = 0; | |
e85b24b5 | 633 | |
2261ec3d MC |
634 | iser_task->data[ISER_DIR_IN].data_len = 0; |
635 | iser_task->data[ISER_DIR_OUT].data_len = 0; | |
e85b24b5 | 636 | |
2261ec3d | 637 | memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, |
e85b24b5 | 638 | sizeof(struct iser_regd_buf)); |
2261ec3d | 639 | memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, |
e85b24b5 OG |
640 | sizeof(struct iser_regd_buf)); |
641 | } | |
642 | ||
2261ec3d | 643 | void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
644 | { |
645 | int deferred; | |
74a20780 | 646 | int is_rdma_aligned = 1; |
3104a217 | 647 | struct iser_regd_buf *regd; |
e85b24b5 OG |
648 | |
649 | /* if we were reading, copy back to unaligned sglist, | |
650 | * anyway dma_unmap and free the copy | |
651 | */ | |
2261ec3d | 652 | if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { |
74a20780 | 653 | is_rdma_aligned = 0; |
2261ec3d | 654 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN); |
74a20780 | 655 | } |
2261ec3d | 656 | if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { |
74a20780 | 657 | is_rdma_aligned = 0; |
2261ec3d | 658 | iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT); |
74a20780 | 659 | } |
e85b24b5 | 660 | |
2261ec3d MC |
661 | if (iser_task->dir[ISER_DIR_IN]) { |
662 | regd = &iser_task->rdma_regd[ISER_DIR_IN]; | |
3104a217 | 663 | deferred = iser_regd_buff_release(regd); |
e85b24b5 | 664 | if (deferred) { |
3104a217 EZ |
665 | iser_err("%d references remain for BUF-IN rdma reg\n", |
666 | atomic_read(®d->ref_count)); | |
e85b24b5 OG |
667 | } |
668 | } | |
669 | ||
2261ec3d MC |
670 | if (iser_task->dir[ISER_DIR_OUT]) { |
671 | regd = &iser_task->rdma_regd[ISER_DIR_OUT]; | |
3104a217 | 672 | deferred = iser_regd_buff_release(regd); |
e85b24b5 | 673 | if (deferred) { |
3104a217 EZ |
674 | iser_err("%d references remain for BUF-OUT rdma reg\n", |
675 | atomic_read(®d->ref_count)); | |
e85b24b5 OG |
676 | } |
677 | } | |
678 | ||
74a20780 EZ |
679 | /* if the data was unaligned, it was already unmapped and then copied */ |
680 | if (is_rdma_aligned) | |
2261ec3d | 681 | iser_dma_unmap_task_data(iser_task); |
e85b24b5 OG |
682 | } |
683 | ||
684 | void iser_dto_buffs_release(struct iser_dto *dto) | |
685 | { | |
686 | int i; | |
687 | ||
688 | for (i = 0; i < dto->regd_vector_len; i++) | |
689 | iser_regd_buff_release(dto->regd[i]); | |
690 | } | |
691 |