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Merge branch 'akpm'
[linux-2.6/next.git] / drivers / infiniband / ulp / iser / iser_initiator.c
blobf299de6b419bb03cf9486e7f813e1100c4cad4a5
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 /* Register user buffer memory and initialize passive rdma
43 * dto descriptor. Total data size is stored in
44 * iser_task->data[ISER_DIR_IN].data_len
45 */
46 static int iser_prepare_read_cmd(struct iscsi_task *task,
47 unsigned int edtl)
48
49 {
50 struct iscsi_iser_task *iser_task = task->dd_data;
51 struct iser_regd_buf *regd_buf;
52 int err;
53 struct iser_hdr *hdr = &iser_task->desc.iser_header;
54 struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
55
56 err = iser_dma_map_task_data(iser_task,
57 buf_in,
58 ISER_DIR_IN,
59 DMA_FROM_DEVICE);
60 if (err)
61 return err;
62
63 if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
64 iser_err("Total data length: %ld, less than EDTL: "
65 "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
66 iser_task->data[ISER_DIR_IN].data_len, edtl,
67 task->itt, iser_task->iser_conn);
68 return -EINVAL;
69 }
70
71 err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN);
72 if (err) {
73 iser_err("Failed to set up Data-IN RDMA\n");
74 return err;
75 }
76 regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
77
78 hdr->flags |= ISER_RSV;
79 hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
80 hdr->read_va = cpu_to_be64(regd_buf->reg.va);
81
82 iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
83 task->itt, regd_buf->reg.rkey,
84 (unsigned long long)regd_buf->reg.va);
85
86 return 0;
87 }
88
89 /* Register user buffer memory and initialize passive rdma
90 * dto descriptor. Total data size is stored in
91 * task->data[ISER_DIR_OUT].data_len
92 */
93 static int
94 iser_prepare_write_cmd(struct iscsi_task *task,
95 unsigned int imm_sz,
96 unsigned int unsol_sz,
97 unsigned int edtl)
98 {
99 struct iscsi_iser_task *iser_task = task->dd_data;
100 struct iser_regd_buf *regd_buf;
101 int err;
102 struct iser_hdr *hdr = &iser_task->desc.iser_header;
103 struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
104 struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
105
106 err = iser_dma_map_task_data(iser_task,
107 buf_out,
108 ISER_DIR_OUT,
109 DMA_TO_DEVICE);
110 if (err)
111 return err;
112
113 if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
114 iser_err("Total data length: %ld, less than EDTL: %d, "
115 "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
116 iser_task->data[ISER_DIR_OUT].data_len,
117 edtl, task->itt, task->conn);
118 return -EINVAL;
119 }
120
121 err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT);
122 if (err != 0) {
123 iser_err("Failed to register write cmd RDMA mem\n");
124 return err;
125 }
126
127 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
128
129 if (unsol_sz < edtl) {
130 hdr->flags |= ISER_WSV;
131 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
132 hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
133
134 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
135 "VA:%#llX + unsol:%d\n",
136 task->itt, regd_buf->reg.rkey,
137 (unsigned long long)regd_buf->reg.va, unsol_sz);
138 }
139
140 if (imm_sz > 0) {
141 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
142 task->itt, imm_sz);
143 tx_dsg->addr = regd_buf->reg.va;
144 tx_dsg->length = imm_sz;
145 tx_dsg->lkey = regd_buf->reg.lkey;
146 iser_task->desc.num_sge = 2;
147 }
148
149 return 0;
150 }
151
152 /* creates a new tx descriptor and adds header regd buffer */
153 static void iser_create_send_desc(struct iser_conn *ib_conn,
154 struct iser_tx_desc *tx_desc)
155 {
156 struct iser_device *device = ib_conn->device;
157
158 ib_dma_sync_single_for_cpu(device->ib_device,
159 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
160
161 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
162 tx_desc->iser_header.flags = ISER_VER;
163
164 tx_desc->num_sge = 1;
165
166 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
167 tx_desc->tx_sg[0].lkey = device->mr->lkey;
168 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
169 }
170 }
171
172
173 static int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
174 {
175 int i, j;
176 u64 dma_addr;
177 struct iser_rx_desc *rx_desc;
178 struct ib_sge *rx_sg;
179 struct iser_device *device = ib_conn->device;
180
181 ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
182 sizeof(struct iser_rx_desc), GFP_KERNEL);
183 if (!ib_conn->rx_descs)
184 goto rx_desc_alloc_fail;
185
186 rx_desc = ib_conn->rx_descs;
187
188 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) {
189 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
190 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
191 if (ib_dma_mapping_error(device->ib_device, dma_addr))
192 goto rx_desc_dma_map_failed;
193
194 rx_desc->dma_addr = dma_addr;
195
196 rx_sg = &rx_desc->rx_sg;
197 rx_sg->addr = rx_desc->dma_addr;
198 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
199 rx_sg->lkey = device->mr->lkey;
200 }
201
202 ib_conn->rx_desc_head = 0;
203 return 0;
204
205 rx_desc_dma_map_failed:
206 rx_desc = ib_conn->rx_descs;
207 for (j = 0; j < i; j++, rx_desc++)
208 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
210 kfree(ib_conn->rx_descs);
211 ib_conn->rx_descs = NULL;
212 rx_desc_alloc_fail:
213 iser_err("failed allocating rx descriptors / data buffers\n");
214 return -ENOMEM;
215 }
216
217 void iser_free_rx_descriptors(struct iser_conn *ib_conn)
218 {
219 int i;
220 struct iser_rx_desc *rx_desc;
221 struct iser_device *device = ib_conn->device;
222
223 if (ib_conn->login_buf) {
224 ib_dma_unmap_single(device->ib_device, ib_conn->login_dma,
225 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
226 kfree(ib_conn->login_buf);
227 }
228
229 if (!ib_conn->rx_descs)
230 return;
231
232 rx_desc = ib_conn->rx_descs;
233 for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
234 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
235 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
236 kfree(ib_conn->rx_descs);
237 }
238
239 /**
240 * iser_conn_set_full_featured_mode - (iSER API)
241 */
242 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
243 {
244 struct iscsi_iser_conn *iser_conn = conn->dd_data;
245
246 iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
247
248 /* Check that there is no posted recv or send buffers left - */
249 /* they must be consumed during the login phase */
250 BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0);
251 BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
252
253 if (iser_alloc_rx_descriptors(iser_conn->ib_conn))
254 return -ENOMEM;
255
256 /* Initial post receive buffers */
257 if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
258 return -ENOMEM;
259
260 return 0;
261 }
262
263 /**
264 * iser_send_command - send command PDU
265 */
266 int iser_send_command(struct iscsi_conn *conn,
267 struct iscsi_task *task)
268 {
269 struct iscsi_iser_conn *iser_conn = conn->dd_data;
270 struct iscsi_iser_task *iser_task = task->dd_data;
271 unsigned long edtl;
272 int err;
273 struct iser_data_buf *data_buf;
274 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
275 struct scsi_cmnd *sc = task->sc;
276 struct iser_tx_desc *tx_desc = &iser_task->desc;
277
278 edtl = ntohl(hdr->data_length);
279
280 /* build the tx desc regd header and add it to the tx desc dto */
281 tx_desc->type = ISCSI_TX_SCSI_COMMAND;
282 iser_create_send_desc(iser_conn->ib_conn, tx_desc);
283
284 if (hdr->flags & ISCSI_FLAG_CMD_READ)
285 data_buf = &iser_task->data[ISER_DIR_IN];
286 else
287 data_buf = &iser_task->data[ISER_DIR_OUT];
288
289 if (scsi_sg_count(sc)) { /* using a scatter list */
290 data_buf->buf = scsi_sglist(sc);
291 data_buf->size = scsi_sg_count(sc);
292 }
293
294 data_buf->data_len = scsi_bufflen(sc);
295
296 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
297 err = iser_prepare_read_cmd(task, edtl);
298 if (err)
299 goto send_command_error;
300 }
301 if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
302 err = iser_prepare_write_cmd(task,
303 task->imm_count,
304 task->imm_count +
305 task->unsol_r2t.data_length,
306 edtl);
307 if (err)
308 goto send_command_error;
309 }
310
311 iser_task->status = ISER_TASK_STATUS_STARTED;
312
313 err = iser_post_send(iser_conn->ib_conn, tx_desc);
314 if (!err)
315 return 0;
316
317 send_command_error:
318 iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
319 return err;
320 }
321
322 /**
323 * iser_send_data_out - send data out PDU
324 */
325 int iser_send_data_out(struct iscsi_conn *conn,
326 struct iscsi_task *task,
327 struct iscsi_data *hdr)
328 {
329 struct iscsi_iser_conn *iser_conn = conn->dd_data;
330 struct iscsi_iser_task *iser_task = task->dd_data;
331 struct iser_tx_desc *tx_desc = NULL;
332 struct iser_regd_buf *regd_buf;
333 unsigned long buf_offset;
334 unsigned long data_seg_len;
335 uint32_t itt;
336 int err = 0;
337 struct ib_sge *tx_dsg;
338
339 itt = (__force uint32_t)hdr->itt;
340 data_seg_len = ntoh24(hdr->dlength);
341 buf_offset = ntohl(hdr->offset);
342
343 iser_dbg("%s itt %d dseg_len %d offset %d\n",
344 __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
345
346 tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
347 if (tx_desc == NULL) {
348 iser_err("Failed to alloc desc for post dataout\n");
349 return -ENOMEM;
350 }
351
352 tx_desc->type = ISCSI_TX_DATAOUT;
353 tx_desc->iser_header.flags = ISER_VER;
354 memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
355
356 /* build the tx desc */
357 iser_initialize_task_headers(task, tx_desc);
358
359 regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
360 tx_dsg = &tx_desc->tx_sg[1];
361 tx_dsg->addr = regd_buf->reg.va + buf_offset;
362 tx_dsg->length = data_seg_len;
363 tx_dsg->lkey = regd_buf->reg.lkey;
364 tx_desc->num_sge = 2;
365
366 if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
367 iser_err("Offset:%ld & DSL:%ld in Data-Out "
368 "inconsistent with total len:%ld, itt:%d\n",
369 buf_offset, data_seg_len,
370 iser_task->data[ISER_DIR_OUT].data_len, itt);
371 err = -EINVAL;
372 goto send_data_out_error;
373 }
374 iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
375 itt, buf_offset, data_seg_len);
376
377
378 err = iser_post_send(iser_conn->ib_conn, tx_desc);
379 if (!err)
380 return 0;
381
382 send_data_out_error:
383 kmem_cache_free(ig.desc_cache, tx_desc);
384 iser_err("conn %p failed err %d\n",conn, err);
385 return err;
386 }
387
388 int iser_send_control(struct iscsi_conn *conn,
389 struct iscsi_task *task)
390 {
391 struct iscsi_iser_conn *iser_conn = conn->dd_data;
392 struct iscsi_iser_task *iser_task = task->dd_data;
393 struct iser_tx_desc *mdesc = &iser_task->desc;
394 unsigned long data_seg_len;
395 int err = 0;
396 struct iser_device *device;
397
398 /* build the tx desc regd header and add it to the tx desc dto */
399 mdesc->type = ISCSI_TX_CONTROL;
400 iser_create_send_desc(iser_conn->ib_conn, mdesc);
401
402 device = iser_conn->ib_conn->device;
403
404 data_seg_len = ntoh24(task->hdr->dlength);
405
406 if (data_seg_len > 0) {
407 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
408 if (task != conn->login_task) {
409 iser_err("data present on non login task!!!\n");
410 goto send_control_error;
411 }
412 memcpy(iser_conn->ib_conn->login_buf, task->data,
413 task->data_count);
414 tx_dsg->addr = iser_conn->ib_conn->login_dma;
415 tx_dsg->length = task->data_count;
416 tx_dsg->lkey = device->mr->lkey;
417 mdesc->num_sge = 2;
418 }
419
420 if (task == conn->login_task) {
421 err = iser_post_recvl(iser_conn->ib_conn);
422 if (err)
423 goto send_control_error;
424 }
425
426 err = iser_post_send(iser_conn->ib_conn, mdesc);
427 if (!err)
428 return 0;
429
430 send_control_error:
431 iser_err("conn %p failed err %d\n",conn, err);
432 return err;
433 }
434
435 /**
436 * iser_rcv_dto_completion - recv DTO completion
437 */
438 void iser_rcv_completion(struct iser_rx_desc *rx_desc,
439 unsigned long rx_xfer_len,
440 struct iser_conn *ib_conn)
441 {
442 struct iscsi_iser_conn *conn = ib_conn->iser_conn;
443 struct iscsi_hdr *hdr;
444 u64 rx_dma;
445 int rx_buflen, outstanding, count, err;
446
447 /* differentiate between login to all other PDUs */
448 if ((char *)rx_desc == ib_conn->login_buf) {
449 rx_dma = ib_conn->login_dma;
450 rx_buflen = ISER_RX_LOGIN_SIZE;
451 } else {
452 rx_dma = rx_desc->dma_addr;
453 rx_buflen = ISER_RX_PAYLOAD_SIZE;
454 }
455
456 ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
457 rx_buflen, DMA_FROM_DEVICE);
458
459 hdr = &rx_desc->iscsi_header;
460
461 iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
462 hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
463
464 iscsi_iser_recv(conn->iscsi_conn, hdr,
465 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
466
467 ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
468 rx_buflen, DMA_FROM_DEVICE);
469
470 /* decrementing conn->post_recv_buf_count only --after-- freeing the *
471 * task eliminates the need to worry on tasks which are completed in *
472 * parallel to the execution of iser_conn_term. So the code that waits *
473 * for the posted rx bufs refcount to become zero handles everything */
474 conn->ib_conn->post_recv_buf_count--;
475
476 if (rx_dma == ib_conn->login_dma)
477 return;
478
479 outstanding = ib_conn->post_recv_buf_count;
480 if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
481 count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
482 ISER_MIN_POSTED_RX);
483 err = iser_post_recvm(ib_conn, count);
484 if (err)
485 iser_err("posting %d rx bufs err %d\n", count, err);
486 }
487 }
488
489 void iser_snd_completion(struct iser_tx_desc *tx_desc,
490 struct iser_conn *ib_conn)
491 {
492 struct iscsi_task *task;
493 struct iser_device *device = ib_conn->device;
494
495 if (tx_desc->type == ISCSI_TX_DATAOUT) {
496 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
497 ISER_HEADERS_LEN, DMA_TO_DEVICE);
498 kmem_cache_free(ig.desc_cache, tx_desc);
499 }
500
501 atomic_dec(&ib_conn->post_send_buf_count);
502
503 if (tx_desc->type == ISCSI_TX_CONTROL) {
504 /* this arithmetic is legal by libiscsi dd_data allocation */
505 task = (void *) ((long)(void *)tx_desc -
506 sizeof(struct iscsi_task));
507 if (task->hdr->itt == RESERVED_ITT)
508 iscsi_put_task(task);
509 }
510 }
511
512 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
513
514 {
515 iser_task->status = ISER_TASK_STATUS_INIT;
516
517 iser_task->dir[ISER_DIR_IN] = 0;
518 iser_task->dir[ISER_DIR_OUT] = 0;
519
520 iser_task->data[ISER_DIR_IN].data_len = 0;
521 iser_task->data[ISER_DIR_OUT].data_len = 0;
522
523 memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
524 sizeof(struct iser_regd_buf));
525 memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
526 sizeof(struct iser_regd_buf));
527 }
528
529 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
530 {
531 int is_rdma_aligned = 1;
532 struct iser_regd_buf *regd;
533
534 /* if we were reading, copy back to unaligned sglist,
535 * anyway dma_unmap and free the copy
536 */
537 if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
538 is_rdma_aligned = 0;
539 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
540 }
541 if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
542 is_rdma_aligned = 0;
543 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
544 }
545
546 if (iser_task->dir[ISER_DIR_IN]) {
547 regd = &iser_task->rdma_regd[ISER_DIR_IN];
548 if (regd->reg.is_fmr)
549 iser_unreg_mem(&regd->reg);
550 }
551
552 if (iser_task->dir[ISER_DIR_OUT]) {
553 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
554 if (regd->reg.is_fmr)
555 iser_unreg_mem(&regd->reg);
556 }
557
558 /* if the data was unaligned, it was already unmapped and then copied */
559 if (is_rdma_aligned)
560 iser_dma_unmap_task_data(iser_task);
561 }
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