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e85b24b5 OG |
1 | /* |
2 | * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. | |
3ee07d27 | 3 | * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
e85b24b5 OG |
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. | |
e85b24b5 OG |
32 | */ |
33 | #include <linux/kernel.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/mm.h> | |
e85b24b5 OG |
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 | ||
e85b24b5 | 43 | /* Register user buffer memory and initialize passive rdma |
d77e6535 SG |
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 | |
e85b24b5 | 47 | */ |
d77e6535 | 48 | static int iser_prepare_read_cmd(struct iscsi_task *task) |
e85b24b5 OG |
49 | |
50 | { | |
2261ec3d | 51 | struct iscsi_iser_task *iser_task = task->dd_data; |
a4ee3539 | 52 | struct iser_device *device = iser_task->iser_conn->ib_conn.device; |
e85b24b5 OG |
53 | struct iser_regd_buf *regd_buf; |
54 | int err; | |
2261ec3d MC |
55 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
56 | struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; | |
e85b24b5 | 57 | |
2261ec3d | 58 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
59 | buf_in, |
60 | ISER_DIR_IN, | |
61 | DMA_FROM_DEVICE); | |
62 | if (err) | |
63 | return err; | |
64 | ||
177e31bd SG |
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 | ||
b4e155ff | 76 | err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_IN); |
e85b24b5 OG |
77 | if (err) { |
78 | iser_err("Failed to set up Data-IN RDMA\n"); | |
79 | return err; | |
80 | } | |
2261ec3d | 81 | regd_buf = &iser_task->rdma_regd[ISER_DIR_IN]; |
e85b24b5 OG |
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", | |
2261ec3d | 88 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
89 | (unsigned long long)regd_buf->reg.va); |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | /* Register user buffer memory and initialize passive rdma | |
d77e6535 SG |
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 | |
e85b24b5 OG |
98 | */ |
99 | static int | |
2261ec3d | 100 | iser_prepare_write_cmd(struct iscsi_task *task, |
e85b24b5 OG |
101 | unsigned int imm_sz, |
102 | unsigned int unsol_sz, | |
103 | unsigned int edtl) | |
104 | { | |
2261ec3d | 105 | struct iscsi_iser_task *iser_task = task->dd_data; |
a4ee3539 | 106 | struct iser_device *device = iser_task->iser_conn->ib_conn.device; |
e85b24b5 OG |
107 | struct iser_regd_buf *regd_buf; |
108 | int err; | |
2261ec3d MC |
109 | struct iser_hdr *hdr = &iser_task->desc.iser_header; |
110 | struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; | |
f19624aa | 111 | struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; |
e85b24b5 | 112 | |
2261ec3d | 113 | err = iser_dma_map_task_data(iser_task, |
e85b24b5 OG |
114 | buf_out, |
115 | ISER_DIR_OUT, | |
116 | DMA_TO_DEVICE); | |
117 | if (err) | |
118 | return err; | |
119 | ||
177e31bd SG |
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 | ||
b4e155ff | 131 | err = device->iser_reg_rdma_mem(iser_task, ISER_DIR_OUT); |
e85b24b5 OG |
132 | if (err != 0) { |
133 | iser_err("Failed to register write cmd RDMA mem\n"); | |
134 | return err; | |
135 | } | |
136 | ||
2261ec3d | 137 | regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT]; |
e85b24b5 OG |
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", | |
2261ec3d | 146 | task->itt, regd_buf->reg.rkey, |
e85b24b5 OG |
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", | |
2261ec3d | 152 | task->itt, imm_sz); |
f19624aa OG |
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; | |
e85b24b5 OG |
157 | } |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
e85b24b5 | 162 | /* creates a new tx descriptor and adds header regd buffer */ |
5716af6e | 163 | static void iser_create_send_desc(struct iser_conn *iser_conn, |
f19624aa | 164 | struct iser_tx_desc *tx_desc) |
e85b24b5 | 165 | { |
a4ee3539 | 166 | struct iser_device *device = iser_conn->ib_conn.device; |
e85b24b5 | 167 | |
f19624aa OG |
168 | ib_dma_sync_single_for_cpu(device->ib_device, |
169 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
e85b24b5 OG |
170 | |
171 | memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); | |
172 | tx_desc->iser_header.flags = ISER_VER; | |
173 | ||
f19624aa OG |
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 | } | |
e85b24b5 OG |
180 | } |
181 | ||
5716af6e | 182 | static void iser_free_login_buf(struct iser_conn *iser_conn) |
986db0d6 | 183 | { |
a4ee3539 SG |
184 | struct iser_device *device = iser_conn->ib_conn.device; |
185 | ||
5716af6e | 186 | if (!iser_conn->login_buf) |
986db0d6 SP |
187 | return; |
188 | ||
5716af6e | 189 | if (iser_conn->login_req_dma) |
a4ee3539 | 190 | ib_dma_unmap_single(device->ib_device, |
5716af6e | 191 | iser_conn->login_req_dma, |
986db0d6 SP |
192 | ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); |
193 | ||
5716af6e | 194 | if (iser_conn->login_resp_dma) |
a4ee3539 | 195 | ib_dma_unmap_single(device->ib_device, |
5716af6e | 196 | iser_conn->login_resp_dma, |
986db0d6 SP |
197 | ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); |
198 | ||
5716af6e | 199 | kfree(iser_conn->login_buf); |
986db0d6 SP |
200 | |
201 | /* make sure we never redo any unmapping */ | |
5716af6e SG |
202 | iser_conn->login_req_dma = 0; |
203 | iser_conn->login_resp_dma = 0; | |
204 | iser_conn->login_buf = NULL; | |
986db0d6 SP |
205 | } |
206 | ||
5716af6e | 207 | static int iser_alloc_login_buf(struct iser_conn *iser_conn) |
986db0d6 | 208 | { |
a4ee3539 | 209 | struct iser_device *device = iser_conn->ib_conn.device; |
986db0d6 SP |
210 | int req_err, resp_err; |
211 | ||
a4ee3539 | 212 | BUG_ON(device == NULL); |
986db0d6 | 213 | |
5716af6e | 214 | iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + |
986db0d6 | 215 | ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
5716af6e | 216 | if (!iser_conn->login_buf) |
986db0d6 SP |
217 | goto out_err; |
218 | ||
5716af6e SG |
219 | iser_conn->login_req_buf = iser_conn->login_buf; |
220 | iser_conn->login_resp_buf = iser_conn->login_buf + | |
986db0d6 SP |
221 | ISCSI_DEF_MAX_RECV_SEG_LEN; |
222 | ||
5716af6e SG |
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); | |
986db0d6 | 227 | |
5716af6e SG |
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); | |
986db0d6 SP |
232 | |
233 | req_err = ib_dma_mapping_error(device->ib_device, | |
5716af6e | 234 | iser_conn->login_req_dma); |
986db0d6 | 235 | resp_err = ib_dma_mapping_error(device->ib_device, |
5716af6e | 236 | iser_conn->login_resp_dma); |
f19624aa | 237 | |
986db0d6 SP |
238 | if (req_err || resp_err) { |
239 | if (req_err) | |
5716af6e | 240 | iser_conn->login_req_dma = 0; |
986db0d6 | 241 | if (resp_err) |
5716af6e | 242 | iser_conn->login_resp_dma = 0; |
986db0d6 SP |
243 | goto free_login_buf; |
244 | } | |
245 | return 0; | |
246 | ||
247 | free_login_buf: | |
5716af6e | 248 | iser_free_login_buf(iser_conn); |
986db0d6 SP |
249 | |
250 | out_err: | |
251 | iser_err("unable to alloc or map login buf\n"); | |
252 | return -ENOMEM; | |
253 | } | |
f19624aa | 254 | |
5716af6e SG |
255 | int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
256 | struct iscsi_session *session) | |
bcc60c38 OG |
257 | { |
258 | int i, j; | |
259 | u64 dma_addr; | |
260 | struct iser_rx_desc *rx_desc; | |
261 | struct ib_sge *rx_sg; | |
a4ee3539 SG |
262 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
263 | struct iser_device *device = ib_conn->device; | |
bcc60c38 | 264 | |
5716af6e SG |
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; | |
b7f04513 | 268 | |
a4ee3539 | 269 | if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max)) |
b4e155ff | 270 | goto create_rdma_reg_res_failed; |
986db0d6 | 271 | |
5716af6e | 272 | if (iser_alloc_login_buf(iser_conn)) |
986db0d6 SP |
273 | goto alloc_login_buf_fail; |
274 | ||
6aabfa76 SG |
275 | iser_conn->num_rx_descs = session->cmds_max; |
276 | iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs * | |
bcc60c38 | 277 | sizeof(struct iser_rx_desc), GFP_KERNEL); |
5716af6e | 278 | if (!iser_conn->rx_descs) |
bcc60c38 OG |
279 | goto rx_desc_alloc_fail; |
280 | ||
5716af6e | 281 | rx_desc = iser_conn->rx_descs; |
bcc60c38 | 282 | |
5716af6e | 283 | for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { |
bcc60c38 OG |
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 | ||
5716af6e | 297 | iser_conn->rx_desc_head = 0; |
bcc60c38 OG |
298 | return 0; |
299 | ||
300 | rx_desc_dma_map_failed: | |
5716af6e | 301 | rx_desc = iser_conn->rx_descs; |
bcc60c38 OG |
302 | for (j = 0; j < i; j++, rx_desc++) |
303 | ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, | |
986db0d6 | 304 | ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
5716af6e SG |
305 | kfree(iser_conn->rx_descs); |
306 | iser_conn->rx_descs = NULL; | |
bcc60c38 | 307 | rx_desc_alloc_fail: |
5716af6e | 308 | iser_free_login_buf(iser_conn); |
986db0d6 | 309 | alloc_login_buf_fail: |
a4ee3539 | 310 | device->iser_free_rdma_reg_res(ib_conn); |
b4e155ff | 311 | create_rdma_reg_res_failed: |
bcc60c38 OG |
312 | iser_err("failed allocating rx descriptors / data buffers\n"); |
313 | return -ENOMEM; | |
314 | } | |
315 | ||
5716af6e | 316 | void iser_free_rx_descriptors(struct iser_conn *iser_conn) |
bcc60c38 OG |
317 | { |
318 | int i; | |
319 | struct iser_rx_desc *rx_desc; | |
a4ee3539 SG |
320 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
321 | struct iser_device *device = ib_conn->device; | |
bcc60c38 | 322 | |
2e02d653 | 323 | if (device->iser_free_rdma_reg_res) |
a4ee3539 | 324 | device->iser_free_rdma_reg_res(ib_conn); |
bcc60c38 | 325 | |
5716af6e SG |
326 | rx_desc = iser_conn->rx_descs; |
327 | for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) | |
bcc60c38 | 328 | ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, |
986db0d6 | 329 | ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
5716af6e | 330 | kfree(iser_conn->rx_descs); |
986db0d6 | 331 | /* make sure we never redo any unmapping */ |
5716af6e | 332 | iser_conn->rx_descs = NULL; |
986db0d6 | 333 | |
5716af6e | 334 | iser_free_login_buf(iser_conn); |
bcc60c38 OG |
335 | } |
336 | ||
89e984e2 | 337 | static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) |
e85b24b5 | 338 | { |
5716af6e | 339 | struct iser_conn *iser_conn = conn->dd_data; |
a4ee3539 | 340 | struct ib_conn *ib_conn = &iser_conn->ib_conn; |
6a06a4b8 | 341 | struct iscsi_session *session = conn->session; |
e85b24b5 | 342 | |
89e984e2 OG |
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; | |
e85b24b5 | 347 | |
89e984e2 | 348 | /* |
ff3dd52d SG |
349 | * Check that there is one posted recv buffer |
350 | * (for the last login response). | |
89e984e2 | 351 | */ |
a4ee3539 | 352 | WARN_ON(ib_conn->post_recv_buf_count != 1); |
bcc60c38 | 353 | |
6a06a4b8 OG |
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", | |
5716af6e | 359 | iser_conn->min_posted_rx); |
6a06a4b8 | 360 | |
e85b24b5 | 361 | /* Initial post receive buffers */ |
5716af6e | 362 | if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) |
bcc60c38 OG |
363 | return -ENOMEM; |
364 | ||
e85b24b5 OG |
365 | return 0; |
366 | } | |
367 | ||
6ec9d4d2 | 368 | static inline bool iser_signal_comp(u8 sig_count) |
6df5a128 SG |
369 | { |
370 | return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); | |
371 | } | |
372 | ||
e85b24b5 OG |
373 | /** |
374 | * iser_send_command - send command PDU | |
375 | */ | |
2747fdb2 | 376 | int iser_send_command(struct iscsi_conn *conn, |
2261ec3d | 377 | struct iscsi_task *task) |
e85b24b5 | 378 | { |
5716af6e | 379 | struct iser_conn *iser_conn = conn->dd_data; |
2261ec3d | 380 | struct iscsi_iser_task *iser_task = task->dd_data; |
e85b24b5 | 381 | unsigned long edtl; |
bcc60c38 | 382 | int err; |
177e31bd | 383 | struct iser_data_buf *data_buf, *prot_buf; |
12352183 | 384 | struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; |
2261ec3d | 385 | struct scsi_cmnd *sc = task->sc; |
f19624aa | 386 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
6ec9d4d2 | 387 | u8 sig_count = ++iser_conn->ib_conn.sig_count; |
e85b24b5 | 388 | |
e85b24b5 OG |
389 | edtl = ntohl(hdr->data_length); |
390 | ||
391 | /* build the tx desc regd header and add it to the tx desc dto */ | |
f19624aa | 392 | tx_desc->type = ISCSI_TX_SCSI_COMMAND; |
5716af6e | 393 | iser_create_send_desc(iser_conn, tx_desc); |
e85b24b5 | 394 | |
177e31bd | 395 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { |
2261ec3d | 396 | data_buf = &iser_task->data[ISER_DIR_IN]; |
177e31bd SG |
397 | prot_buf = &iser_task->prot[ISER_DIR_IN]; |
398 | } else { | |
2261ec3d | 399 | data_buf = &iser_task->data[ISER_DIR_OUT]; |
177e31bd SG |
400 | prot_buf = &iser_task->prot[ISER_DIR_OUT]; |
401 | } | |
e85b24b5 | 402 | |
da9c0c77 FT |
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); | |
e85b24b5 | 406 | } |
da9c0c77 | 407 | data_buf->data_len = scsi_bufflen(sc); |
e85b24b5 | 408 | |
177e31bd SG |
409 | if (scsi_prot_sg_count(sc)) { |
410 | prot_buf->buf = scsi_prot_sglist(sc); | |
411 | prot_buf->size = scsi_prot_sg_count(sc); | |
a065fe6a SG |
412 | prot_buf->data_len = (data_buf->data_len >> |
413 | ilog2(sc->device->sector_size)) * 8; | |
177e31bd SG |
414 | } |
415 | ||
e85b24b5 | 416 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { |
d77e6535 | 417 | err = iser_prepare_read_cmd(task); |
e85b24b5 OG |
418 | if (err) |
419 | goto send_command_error; | |
420 | } | |
421 | if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { | |
2261ec3d MC |
422 | err = iser_prepare_write_cmd(task, |
423 | task->imm_count, | |
424 | task->imm_count + | |
0f9c7449 | 425 | task->unsol_r2t.data_length, |
e85b24b5 OG |
426 | edtl); |
427 | if (err) | |
428 | goto send_command_error; | |
429 | } | |
430 | ||
2261ec3d | 431 | iser_task->status = ISER_TASK_STATUS_STARTED; |
e85b24b5 | 432 | |
6df5a128 | 433 | err = iser_post_send(&iser_conn->ib_conn, tx_desc, |
6ec9d4d2 | 434 | iser_signal_comp(sig_count)); |
e85b24b5 OG |
435 | if (!err) |
436 | return 0; | |
437 | ||
438 | send_command_error: | |
2261ec3d | 439 | iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); |
e85b24b5 OG |
440 | return err; |
441 | } | |
442 | ||
443 | /** | |
444 | * iser_send_data_out - send data out PDU | |
445 | */ | |
2747fdb2 | 446 | int iser_send_data_out(struct iscsi_conn *conn, |
2261ec3d | 447 | struct iscsi_task *task, |
e85b24b5 OG |
448 | struct iscsi_data *hdr) |
449 | { | |
5716af6e | 450 | struct iser_conn *iser_conn = conn->dd_data; |
2261ec3d | 451 | struct iscsi_iser_task *iser_task = task->dd_data; |
f19624aa OG |
452 | struct iser_tx_desc *tx_desc = NULL; |
453 | struct iser_regd_buf *regd_buf; | |
e85b24b5 OG |
454 | unsigned long buf_offset; |
455 | unsigned long data_seg_len; | |
0a22ab92 | 456 | uint32_t itt; |
e85b24b5 | 457 | int err = 0; |
f19624aa OG |
458 | struct ib_sge *tx_dsg; |
459 | ||
0a22ab92 | 460 | itt = (__force uint32_t)hdr->itt; |
e85b24b5 OG |
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 | ||
528f4e8c | 467 | tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); |
e85b24b5 OG |
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; | |
f19624aa | 474 | tx_desc->iser_header.flags = ISER_VER; |
e85b24b5 OG |
475 | memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); |
476 | ||
f19624aa OG |
477 | /* build the tx desc */ |
478 | iser_initialize_task_headers(task, tx_desc); | |
e85b24b5 | 479 | |
f19624aa OG |
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; | |
e85b24b5 | 486 | |
2261ec3d | 487 | if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { |
e85b24b5 OG |
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, | |
2261ec3d | 491 | iser_task->data[ISER_DIR_OUT].data_len, itt); |
e85b24b5 OG |
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 | ||
6df5a128 | 499 | err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); |
e85b24b5 OG |
500 | if (!err) |
501 | return 0; | |
502 | ||
503 | send_data_out_error: | |
e85b24b5 OG |
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, | |
2261ec3d | 510 | struct iscsi_task *task) |
e85b24b5 | 511 | { |
5716af6e | 512 | struct iser_conn *iser_conn = conn->dd_data; |
2261ec3d | 513 | struct iscsi_iser_task *iser_task = task->dd_data; |
f19624aa | 514 | struct iser_tx_desc *mdesc = &iser_task->desc; |
e85b24b5 | 515 | unsigned long data_seg_len; |
f19624aa | 516 | int err = 0; |
e85b24b5 OG |
517 | struct iser_device *device; |
518 | ||
e85b24b5 OG |
519 | /* build the tx desc regd header and add it to the tx desc dto */ |
520 | mdesc->type = ISCSI_TX_CONTROL; | |
5716af6e | 521 | iser_create_send_desc(iser_conn, mdesc); |
e85b24b5 | 522 | |
a4ee3539 | 523 | device = iser_conn->ib_conn.device; |
e85b24b5 | 524 | |
2261ec3d | 525 | data_seg_len = ntoh24(task->hdr->dlength); |
e85b24b5 OG |
526 | |
527 | if (data_seg_len > 0) { | |
f19624aa OG |
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 | } | |
2c4ce609 OG |
533 | |
534 | ib_dma_sync_single_for_cpu(device->ib_device, | |
5716af6e | 535 | iser_conn->login_req_dma, task->data_count, |
2c4ce609 OG |
536 | DMA_TO_DEVICE); |
537 | ||
5716af6e | 538 | memcpy(iser_conn->login_req_buf, task->data, task->data_count); |
2c4ce609 OG |
539 | |
540 | ib_dma_sync_single_for_device(device->ib_device, | |
5716af6e | 541 | iser_conn->login_req_dma, task->data_count, |
2c4ce609 OG |
542 | DMA_TO_DEVICE); |
543 | ||
5716af6e | 544 | tx_dsg->addr = iser_conn->login_req_dma; |
200ae1a0 | 545 | tx_dsg->length = task->data_count; |
f19624aa OG |
546 | tx_dsg->lkey = device->mr->lkey; |
547 | mdesc->num_sge = 2; | |
e85b24b5 OG |
548 | } |
549 | ||
bcc60c38 | 550 | if (task == conn->login_task) { |
6a06a4b8 OG |
551 | iser_dbg("op %x dsl %lx, posting login rx buffer\n", |
552 | task->hdr->opcode, data_seg_len); | |
5716af6e | 553 | err = iser_post_recvl(iser_conn); |
bcc60c38 OG |
554 | if (err) |
555 | goto send_control_error; | |
89e984e2 OG |
556 | err = iser_post_rx_bufs(conn, task->hdr); |
557 | if (err) | |
558 | goto send_control_error; | |
e85b24b5 OG |
559 | } |
560 | ||
6df5a128 | 561 | err = iser_post_send(&iser_conn->ib_conn, mdesc, true); |
e85b24b5 OG |
562 | if (!err) |
563 | return 0; | |
564 | ||
565 | send_control_error: | |
e85b24b5 OG |
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 | */ | |
bcc60c38 OG |
573 | void iser_rcv_completion(struct iser_rx_desc *rx_desc, |
574 | unsigned long rx_xfer_len, | |
a4ee3539 | 575 | struct ib_conn *ib_conn) |
e85b24b5 | 576 | { |
a4ee3539 SG |
577 | struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn, |
578 | ib_conn); | |
e85b24b5 | 579 | struct iscsi_hdr *hdr; |
bcc60c38 OG |
580 | u64 rx_dma; |
581 | int rx_buflen, outstanding, count, err; | |
582 | ||
583 | /* differentiate between login to all other PDUs */ | |
5716af6e SG |
584 | if ((char *)rx_desc == iser_conn->login_resp_buf) { |
585 | rx_dma = iser_conn->login_resp_dma; | |
bcc60c38 OG |
586 | rx_buflen = ISER_RX_LOGIN_SIZE; |
587 | } else { | |
588 | rx_dma = rx_desc->dma_addr; | |
589 | rx_buflen = ISER_RX_PAYLOAD_SIZE; | |
590 | } | |
e85b24b5 | 591 | |
a4ee3539 | 592 | ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma, |
5716af6e | 593 | rx_buflen, DMA_FROM_DEVICE); |
e85b24b5 | 594 | |
bcc60c38 | 595 | hdr = &rx_desc->iscsi_header; |
e85b24b5 | 596 | |
bcc60c38 OG |
597 | iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, |
598 | hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN)); | |
e85b24b5 | 599 | |
5716af6e | 600 | iscsi_iser_recv(iser_conn->iscsi_conn, hdr, rx_desc->data, |
4667f5df | 601 | rx_xfer_len - ISER_HEADERS_LEN); |
e85b24b5 | 602 | |
a4ee3539 | 603 | ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma, |
4667f5df | 604 | rx_buflen, DMA_FROM_DEVICE); |
e85b24b5 OG |
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 */ | |
a4ee3539 | 610 | ib_conn->post_recv_buf_count--; |
bcc60c38 | 611 | |
5716af6e | 612 | if (rx_dma == iser_conn->login_resp_dma) |
bcc60c38 OG |
613 | return; |
614 | ||
a4ee3539 | 615 | outstanding = ib_conn->post_recv_buf_count; |
5716af6e SG |
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); | |
bcc60c38 OG |
620 | if (err) |
621 | iser_err("posting %d rx bufs err %d\n", count, err); | |
622 | } | |
e85b24b5 OG |
623 | } |
624 | ||
f19624aa | 625 | void iser_snd_completion(struct iser_tx_desc *tx_desc, |
a4ee3539 | 626 | struct ib_conn *ib_conn) |
e85b24b5 | 627 | { |
2261ec3d | 628 | struct iscsi_task *task; |
a4ee3539 | 629 | struct iser_device *device = ib_conn->device; |
e85b24b5 | 630 | |
f19624aa OG |
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); | |
e85b24b5 | 634 | kmem_cache_free(ig.desc_cache, tx_desc); |
fd8b48b2 | 635 | tx_desc = NULL; |
f19624aa | 636 | } |
e85b24b5 | 637 | |
fd8b48b2 | 638 | if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) { |
e85b24b5 | 639 | /* this arithmetic is legal by libiscsi dd_data allocation */ |
2261ec3d MC |
640 | task = (void *) ((long)(void *)tx_desc - |
641 | sizeof(struct iscsi_task)); | |
642 | if (task->hdr->itt == RESERVED_ITT) | |
643 | iscsi_put_task(task); | |
e85b24b5 OG |
644 | } |
645 | } | |
646 | ||
2261ec3d | 647 | void iser_task_rdma_init(struct iscsi_iser_task *iser_task) |
e85b24b5 OG |
648 | |
649 | { | |
2261ec3d | 650 | iser_task->status = ISER_TASK_STATUS_INIT; |
e85b24b5 | 651 | |
2261ec3d MC |
652 | iser_task->dir[ISER_DIR_IN] = 0; |
653 | iser_task->dir[ISER_DIR_OUT] = 0; | |
e85b24b5 | 654 | |
2261ec3d MC |
655 | iser_task->data[ISER_DIR_IN].data_len = 0; |
656 | iser_task->data[ISER_DIR_OUT].data_len = 0; | |
e85b24b5 | 657 | |
177e31bd SG |
658 | iser_task->prot[ISER_DIR_IN].data_len = 0; |
659 | iser_task->prot[ISER_DIR_OUT].data_len = 0; | |
660 | ||
2261ec3d | 661 | memset(&iser_task->rdma_regd[ISER_DIR_IN], 0, |
e85b24b5 | 662 | sizeof(struct iser_regd_buf)); |
2261ec3d | 663 | memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0, |
e85b24b5 OG |
664 | sizeof(struct iser_regd_buf)); |
665 | } | |
666 | ||
2261ec3d | 667 | void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) |
e85b24b5 | 668 | { |
a4ee3539 | 669 | struct iser_device *device = iser_task->iser_conn->ib_conn.device; |
9a8b08fa | 670 | int is_rdma_data_aligned = 1; |
177e31bd SG |
671 | int is_rdma_prot_aligned = 1; |
672 | int prot_count = scsi_prot_sg_count(iser_task->sc); | |
e85b24b5 OG |
673 | |
674 | /* if we were reading, copy back to unaligned sglist, | |
675 | * anyway dma_unmap and free the copy | |
676 | */ | |
2261ec3d | 677 | if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) { |
9a8b08fa SG |
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); | |
74a20780 | 683 | } |
9a8b08fa | 684 | |
2261ec3d | 685 | if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) { |
9a8b08fa SG |
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); | |
74a20780 | 691 | } |
e85b24b5 | 692 | |
177e31bd SG |
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 | ||
9a8b08fa | 709 | if (iser_task->dir[ISER_DIR_IN]) { |
b4e155ff | 710 | device->iser_unreg_rdma_mem(iser_task, ISER_DIR_IN); |
9a8b08fa SG |
711 | if (is_rdma_data_aligned) |
712 | iser_dma_unmap_task_data(iser_task, | |
c6c95ef4 RD |
713 | &iser_task->data[ISER_DIR_IN], |
714 | DMA_FROM_DEVICE); | |
177e31bd SG |
715 | if (prot_count && is_rdma_prot_aligned) |
716 | iser_dma_unmap_task_data(iser_task, | |
c6c95ef4 RD |
717 | &iser_task->prot[ISER_DIR_IN], |
718 | DMA_FROM_DEVICE); | |
9a8b08fa | 719 | } |
e85b24b5 | 720 | |
9a8b08fa SG |
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, | |
c6c95ef4 RD |
725 | &iser_task->data[ISER_DIR_OUT], |
726 | DMA_TO_DEVICE); | |
9a8b08fa SG |
727 | if (prot_count && is_rdma_prot_aligned) |
728 | iser_dma_unmap_task_data(iser_task, | |
c6c95ef4 RD |
729 | &iser_task->prot[ISER_DIR_OUT], |
730 | DMA_TO_DEVICE); | |
9a8b08fa | 731 | } |
e85b24b5 | 732 | } |