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FUJITA Tomonori26b14822006-12-01 03:00:50 +09001/*
Bart Van Assche40c4f3e2009-12-04 20:38:49 +01002 * SCSI RDMA Protocol lib functions
FUJITA Tomonori26b14822006-12-01 03:00:50 +09003 *
4 * Copyright (C) 2006 FUJITA Tomonori <tomof@acm.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 */
21#include <linux/err.h>
22#include <linux/kfifo.h>
23#include <linux/scatterlist.h>
24#include <linux/dma-mapping.h>
FUJITA Tomonori26b14822006-12-01 03:00:50 +090025#include <scsi/scsi.h>
26#include <scsi/scsi_cmnd.h>
27#include <scsi/scsi_tcq.h>
28#include <scsi/scsi_tgt.h>
29#include <scsi/srp.h>
30#include <scsi/libsrp.h>
31
32enum srp_task_attributes {
33 SRP_SIMPLE_TASK = 0,
34 SRP_HEAD_TASK = 1,
35 SRP_ORDERED_TASK = 2,
36 SRP_ACA_TASK = 4
37};
38
39/* tmp - will replace with SCSI logging stuff */
40#define eprintk(fmt, args...) \
41do { \
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -070042 printk("%s(%d) " fmt, __func__, __LINE__, ##args); \
FUJITA Tomonori26b14822006-12-01 03:00:50 +090043} while (0)
44/* #define dprintk eprintk */
45#define dprintk(fmt, args...)
46
47static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
48 struct srp_buf **ring)
49{
50 int i;
51 struct iu_entry *iue;
52
53 q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL);
54 if (!q->pool)
55 return -ENOMEM;
56 q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL);
57 if (!q->items)
58 goto free_pool;
59
60 spin_lock_init(&q->lock);
Stefani Seiboldc1e13f22009-12-21 14:37:27 -080061 kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *));
FUJITA Tomonori26b14822006-12-01 03:00:50 +090062
63 for (i = 0, iue = q->items; i < max; i++) {
Stefani Seibold7acd72e2009-12-21 14:37:28 -080064 kfifo_in(&q->queue, (void *) &iue, sizeof(void *));
FUJITA Tomonori26b14822006-12-01 03:00:50 +090065 iue->sbuf = ring[i];
66 iue++;
67 }
68 return 0;
69
FUJITA Tomonori26b14822006-12-01 03:00:50 +090070 kfree(q->items);
71free_pool:
72 kfree(q->pool);
73 return -ENOMEM;
74}
75
76static void srp_iu_pool_free(struct srp_queue *q)
77{
78 kfree(q->items);
79 kfree(q->pool);
80}
81
82static struct srp_buf **srp_ring_alloc(struct device *dev,
83 size_t max, size_t size)
84{
85 int i;
86 struct srp_buf **ring;
87
88 ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL);
89 if (!ring)
90 return NULL;
91
92 for (i = 0; i < max; i++) {
93 ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL);
94 if (!ring[i])
95 goto out;
96 ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma,
97 GFP_KERNEL);
98 if (!ring[i]->buf)
99 goto out;
100 }
101 return ring;
102
103out:
104 for (i = 0; i < max && ring[i]; i++) {
105 if (ring[i]->buf)
106 dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
107 kfree(ring[i]);
108 }
109 kfree(ring);
110
111 return NULL;
112}
113
114static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max,
115 size_t size)
116{
117 int i;
118
119 for (i = 0; i < max; i++) {
120 dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
121 kfree(ring[i]);
122 }
Bart Van Asscheafffd3d2009-08-30 12:36:48 +0200123 kfree(ring);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900124}
125
126int srp_target_alloc(struct srp_target *target, struct device *dev,
127 size_t nr, size_t iu_size)
128{
129 int err;
130
131 spin_lock_init(&target->lock);
132 INIT_LIST_HEAD(&target->cmd_queue);
133
134 target->dev = dev;
Greg Kroah-Hartman78c55d72009-04-30 14:43:31 -0700135 dev_set_drvdata(target->dev, target);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900136
137 target->srp_iu_size = iu_size;
138 target->rx_ring_size = nr;
139 target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size);
140 if (!target->rx_ring)
141 return -ENOMEM;
142 err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring);
143 if (err)
144 goto free_ring;
145
146 return 0;
147
148free_ring:
149 srp_ring_free(target->dev, target->rx_ring, nr, iu_size);
150 return -ENOMEM;
151}
152EXPORT_SYMBOL_GPL(srp_target_alloc);
153
154void srp_target_free(struct srp_target *target)
155{
156 srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size,
157 target->srp_iu_size);
158 srp_iu_pool_free(&target->iu_queue);
159}
160EXPORT_SYMBOL_GPL(srp_target_free);
161
162struct iu_entry *srp_iu_get(struct srp_target *target)
163{
164 struct iu_entry *iue = NULL;
165
Stefani Seibold9842c382009-12-21 14:37:29 -0800166 if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue,
167 sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) {
168 WARN_ONCE(1, "unexpected fifo state");
169 return NULL;
170 }
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900171 if (!iue)
172 return iue;
173 iue->target = target;
174 INIT_LIST_HEAD(&iue->ilist);
175 iue->flags = 0;
176 return iue;
177}
178EXPORT_SYMBOL_GPL(srp_iu_get);
179
180void srp_iu_put(struct iu_entry *iue)
181{
Stefani Seibold7acd72e2009-12-21 14:37:28 -0800182 kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue,
Stefani Seiboldc1e13f22009-12-21 14:37:27 -0800183 sizeof(void *), &iue->target->iu_queue.lock);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900184}
185EXPORT_SYMBOL_GPL(srp_iu_put);
186
187static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md,
188 enum dma_data_direction dir, srp_rdma_t rdma_io,
189 int dma_map, int ext_desc)
190{
191 struct iu_entry *iue = NULL;
192 struct scatterlist *sg = NULL;
193 int err, nsg = 0, len;
194
195 if (dma_map) {
196 iue = (struct iu_entry *) sc->SCp.ptr;
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900197 sg = scsi_sglist(sc);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900198
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900199 dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc),
200 md->len, scsi_sg_count(sc));
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900201
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900202 nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900203 DMA_BIDIRECTIONAL);
204 if (!nsg) {
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900205 printk("fail to map %p %d\n", iue, scsi_sg_count(sc));
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900206 return 0;
207 }
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900208 len = min(scsi_bufflen(sc), md->len);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900209 } else
210 len = md->len;
211
212 err = rdma_io(sc, sg, nsg, md, 1, dir, len);
213
214 if (dma_map)
215 dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
216
217 return err;
218}
219
220static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
221 struct srp_indirect_buf *id,
222 enum dma_data_direction dir, srp_rdma_t rdma_io,
223 int dma_map, int ext_desc)
224{
225 struct iu_entry *iue = NULL;
226 struct srp_direct_buf *md = NULL;
227 struct scatterlist dummy, *sg = NULL;
228 dma_addr_t token = 0;
Bastian Blankad1331a2007-04-07 18:10:00 +0900229 int err = 0;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900230 int nmd, nsg = 0, len;
231
232 if (dma_map || ext_desc) {
233 iue = (struct iu_entry *) sc->SCp.ptr;
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900234 sg = scsi_sglist(sc);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900235
236 dprintk("%p %u %u %d %d\n",
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900237 iue, scsi_bufflen(sc), id->len,
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900238 cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
239 }
240
241 nmd = id->table_desc.len / sizeof(struct srp_direct_buf);
242
243 if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) ||
244 (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) {
245 md = &id->desc_list[0];
246 goto rdma;
247 }
248
249 if (ext_desc && dma_map) {
250 md = dma_alloc_coherent(iue->target->dev, id->table_desc.len,
251 &token, GFP_KERNEL);
252 if (!md) {
253 eprintk("Can't get dma memory %u\n", id->table_desc.len);
254 return -ENOMEM;
255 }
256
257 sg_init_one(&dummy, md, id->table_desc.len);
258 sg_dma_address(&dummy) = token;
FUJITA Tomonoribcd4e222007-05-11 19:10:45 +0900259 sg_dma_len(&dummy) = id->table_desc.len;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900260 err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
261 id->table_desc.len);
Bastian Blankad1331a2007-04-07 18:10:00 +0900262 if (err) {
263 eprintk("Error copying indirect table %d\n", err);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900264 goto free_mem;
265 }
266 } else {
267 eprintk("This command uses external indirect buffer\n");
268 return -EINVAL;
269 }
270
271rdma:
272 if (dma_map) {
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900273 nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
274 DMA_BIDIRECTIONAL);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900275 if (!nsg) {
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900276 eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc));
Bastian Blankad1331a2007-04-07 18:10:00 +0900277 err = -EIO;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900278 goto free_mem;
279 }
FUJITA Tomonorif10ab662007-10-25 01:21:30 +0900280 len = min(scsi_bufflen(sc), id->len);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900281 } else
282 len = id->len;
283
284 err = rdma_io(sc, sg, nsg, md, nmd, dir, len);
285
286 if (dma_map)
287 dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
288
289free_mem:
290 if (token && dma_map)
291 dma_free_coherent(iue->target->dev, id->table_desc.len, md, token);
292
Bastian Blankad1331a2007-04-07 18:10:00 +0900293 return err;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900294}
295
296static int data_out_desc_size(struct srp_cmd *cmd)
297{
298 int size = 0;
299 u8 fmt = cmd->buf_fmt >> 4;
300
301 switch (fmt) {
302 case SRP_NO_DATA_DESC:
303 break;
304 case SRP_DATA_DESC_DIRECT:
305 size = sizeof(struct srp_direct_buf);
306 break;
307 case SRP_DATA_DESC_INDIRECT:
308 size = sizeof(struct srp_indirect_buf) +
309 sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt;
310 break;
311 default:
312 eprintk("client error. Invalid data_out_format %x\n", fmt);
313 break;
314 }
315 return size;
316}
317
318/*
319 * TODO: this can be called multiple times for a single command if it
320 * has very long data.
321 */
322int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
323 srp_rdma_t rdma_io, int dma_map, int ext_desc)
324{
325 struct srp_direct_buf *md;
326 struct srp_indirect_buf *id;
327 enum dma_data_direction dir;
328 int offset, err = 0;
329 u8 format;
330
331 offset = cmd->add_cdb_len * 4;
332
333 dir = srp_cmd_direction(cmd);
334 if (dir == DMA_FROM_DEVICE)
335 offset += data_out_desc_size(cmd);
336
337 if (dir == DMA_TO_DEVICE)
338 format = cmd->buf_fmt >> 4;
339 else
340 format = cmd->buf_fmt & ((1U << 4) - 1);
341
342 switch (format) {
343 case SRP_NO_DATA_DESC:
344 break;
345 case SRP_DATA_DESC_DIRECT:
346 md = (struct srp_direct_buf *)
347 (cmd->add_data + offset);
348 err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc);
349 break;
350 case SRP_DATA_DESC_INDIRECT:
351 id = (struct srp_indirect_buf *)
352 (cmd->add_data + offset);
353 err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map,
354 ext_desc);
355 break;
356 default:
357 eprintk("Unknown format %d %x\n", dir, format);
Bastian Blankad1331a2007-04-07 18:10:00 +0900358 err = -EINVAL;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900359 }
360
361 return err;
362}
363EXPORT_SYMBOL_GPL(srp_transfer_data);
364
365static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir)
366{
367 struct srp_direct_buf *md;
368 struct srp_indirect_buf *id;
369 int len = 0, offset = cmd->add_cdb_len * 4;
370 u8 fmt;
371
372 if (dir == DMA_TO_DEVICE)
373 fmt = cmd->buf_fmt >> 4;
374 else {
375 fmt = cmd->buf_fmt & ((1U << 4) - 1);
376 offset += data_out_desc_size(cmd);
377 }
378
379 switch (fmt) {
380 case SRP_NO_DATA_DESC:
381 break;
382 case SRP_DATA_DESC_DIRECT:
383 md = (struct srp_direct_buf *) (cmd->add_data + offset);
384 len = md->len;
385 break;
386 case SRP_DATA_DESC_INDIRECT:
387 id = (struct srp_indirect_buf *) (cmd->add_data + offset);
388 len = id->len;
389 break;
390 default:
391 eprintk("invalid data format %x\n", fmt);
392 break;
393 }
394 return len;
395}
396
397int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info,
FUJITA Tomonori17b0bcf2007-07-11 15:08:21 +0900398 u64 itn_id, u64 addr)
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900399{
400 enum dma_data_direction dir;
401 struct scsi_cmnd *sc;
402 int tag, len, err;
403
404 switch (cmd->task_attr) {
405 case SRP_SIMPLE_TASK:
406 tag = MSG_SIMPLE_TAG;
407 break;
408 case SRP_ORDERED_TASK:
409 tag = MSG_ORDERED_TAG;
410 break;
411 case SRP_HEAD_TASK:
412 tag = MSG_HEAD_TAG;
413 break;
414 default:
415 eprintk("Task attribute %d not supported\n", cmd->task_attr);
416 tag = MSG_ORDERED_TAG;
417 }
418
419 dir = srp_cmd_direction(cmd);
420 len = vscsis_data_length(cmd, dir);
421
422 dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0],
423 cmd->lun, dir, len, tag, (unsigned long long) cmd->tag);
424
425 sc = scsi_host_get_command(shost, dir, GFP_KERNEL);
426 if (!sc)
427 return -ENOMEM;
428
429 sc->SCp.ptr = info;
430 memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE);
Boaz Harrosh30b0c372007-12-13 13:47:40 +0200431 sc->sdb.length = len;
432 sc->sdb.table.sgl = (void *) (unsigned long) addr;
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900433 sc->tag = tag;
FUJITA Tomonori17b0bcf2007-07-11 15:08:21 +0900434 err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun,
435 cmd->tag);
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900436 if (err)
437 scsi_host_put_command(shost, sc);
438
439 return err;
440}
441EXPORT_SYMBOL_GPL(srp_cmd_queue);
442
Bart Van Assche40c4f3e2009-12-04 20:38:49 +0100443MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions");
FUJITA Tomonori26b14822006-12-01 03:00:50 +0900444MODULE_AUTHOR("FUJITA Tomonori");
445MODULE_LICENSE("GPL");