Commit | Line | Data |
---|---|---|
26b14823 | 1 | /* |
40c4f3e4 | 2 | * SCSI RDMA Protocol lib functions |
26b14823 FT |
3 | * |
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> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
26b14823 FT |
23 | #include <linux/kfifo.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <linux/dma-mapping.h> | |
26b14823 FT |
26 | #include <scsi/scsi.h> |
27 | #include <scsi/scsi_cmnd.h> | |
28 | #include <scsi/scsi_tcq.h> | |
29 | #include <scsi/scsi_tgt.h> | |
30 | #include <scsi/srp.h> | |
31 | #include <scsi/libsrp.h> | |
32 | ||
33 | enum srp_task_attributes { | |
34 | SRP_SIMPLE_TASK = 0, | |
35 | SRP_HEAD_TASK = 1, | |
36 | SRP_ORDERED_TASK = 2, | |
37 | SRP_ACA_TASK = 4 | |
38 | }; | |
39 | ||
40 | /* tmp - will replace with SCSI logging stuff */ | |
41 | #define eprintk(fmt, args...) \ | |
42 | do { \ | |
cadbd4a5 | 43 | printk("%s(%d) " fmt, __func__, __LINE__, ##args); \ |
26b14823 FT |
44 | } while (0) |
45 | /* #define dprintk eprintk */ | |
46 | #define dprintk(fmt, args...) | |
47 | ||
48 | static int srp_iu_pool_alloc(struct srp_queue *q, size_t max, | |
49 | struct srp_buf **ring) | |
50 | { | |
51 | int i; | |
52 | struct iu_entry *iue; | |
53 | ||
54 | q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL); | |
55 | if (!q->pool) | |
56 | return -ENOMEM; | |
57 | q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL); | |
58 | if (!q->items) | |
59 | goto free_pool; | |
60 | ||
61 | spin_lock_init(&q->lock); | |
c1e13f25 | 62 | kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *)); |
26b14823 FT |
63 | |
64 | for (i = 0, iue = q->items; i < max; i++) { | |
7acd72eb | 65 | kfifo_in(&q->queue, (void *) &iue, sizeof(void *)); |
26b14823 FT |
66 | iue->sbuf = ring[i]; |
67 | iue++; | |
68 | } | |
69 | return 0; | |
70 | ||
26b14823 FT |
71 | kfree(q->items); |
72 | free_pool: | |
73 | kfree(q->pool); | |
74 | return -ENOMEM; | |
75 | } | |
76 | ||
77 | static void srp_iu_pool_free(struct srp_queue *q) | |
78 | { | |
79 | kfree(q->items); | |
80 | kfree(q->pool); | |
81 | } | |
82 | ||
83 | static struct srp_buf **srp_ring_alloc(struct device *dev, | |
84 | size_t max, size_t size) | |
85 | { | |
86 | int i; | |
87 | struct srp_buf **ring; | |
88 | ||
89 | ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL); | |
90 | if (!ring) | |
91 | return NULL; | |
92 | ||
93 | for (i = 0; i < max; i++) { | |
94 | ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL); | |
95 | if (!ring[i]) | |
96 | goto out; | |
97 | ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma, | |
98 | GFP_KERNEL); | |
99 | if (!ring[i]->buf) | |
100 | goto out; | |
101 | } | |
102 | return ring; | |
103 | ||
104 | out: | |
105 | for (i = 0; i < max && ring[i]; i++) { | |
106 | if (ring[i]->buf) | |
107 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
108 | kfree(ring[i]); | |
109 | } | |
110 | kfree(ring); | |
111 | ||
112 | return NULL; | |
113 | } | |
114 | ||
115 | static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max, | |
116 | size_t size) | |
117 | { | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < max; i++) { | |
121 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
122 | kfree(ring[i]); | |
123 | } | |
afffd3da | 124 | kfree(ring); |
26b14823 FT |
125 | } |
126 | ||
127 | int srp_target_alloc(struct srp_target *target, struct device *dev, | |
128 | size_t nr, size_t iu_size) | |
129 | { | |
130 | int err; | |
131 | ||
132 | spin_lock_init(&target->lock); | |
133 | INIT_LIST_HEAD(&target->cmd_queue); | |
134 | ||
135 | target->dev = dev; | |
78c55d76 | 136 | dev_set_drvdata(target->dev, target); |
26b14823 FT |
137 | |
138 | target->srp_iu_size = iu_size; | |
139 | target->rx_ring_size = nr; | |
140 | target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size); | |
141 | if (!target->rx_ring) | |
142 | return -ENOMEM; | |
143 | err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring); | |
144 | if (err) | |
145 | goto free_ring; | |
146 | ||
147 | return 0; | |
148 | ||
149 | free_ring: | |
150 | srp_ring_free(target->dev, target->rx_ring, nr, iu_size); | |
151 | return -ENOMEM; | |
152 | } | |
153 | EXPORT_SYMBOL_GPL(srp_target_alloc); | |
154 | ||
155 | void srp_target_free(struct srp_target *target) | |
156 | { | |
157 | srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size, | |
158 | target->srp_iu_size); | |
159 | srp_iu_pool_free(&target->iu_queue); | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(srp_target_free); | |
162 | ||
163 | struct iu_entry *srp_iu_get(struct srp_target *target) | |
164 | { | |
165 | struct iu_entry *iue = NULL; | |
166 | ||
9842c38e SS |
167 | if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue, |
168 | sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) { | |
169 | WARN_ONCE(1, "unexpected fifo state"); | |
170 | return NULL; | |
171 | } | |
26b14823 FT |
172 | if (!iue) |
173 | return iue; | |
174 | iue->target = target; | |
175 | INIT_LIST_HEAD(&iue->ilist); | |
176 | iue->flags = 0; | |
177 | return iue; | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(srp_iu_get); | |
180 | ||
181 | void srp_iu_put(struct iu_entry *iue) | |
182 | { | |
7acd72eb | 183 | kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue, |
c1e13f25 | 184 | sizeof(void *), &iue->target->iu_queue.lock); |
26b14823 FT |
185 | } |
186 | EXPORT_SYMBOL_GPL(srp_iu_put); | |
187 | ||
188 | static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md, | |
189 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
190 | int dma_map, int ext_desc) | |
191 | { | |
192 | struct iu_entry *iue = NULL; | |
193 | struct scatterlist *sg = NULL; | |
194 | int err, nsg = 0, len; | |
195 | ||
196 | if (dma_map) { | |
197 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 198 | sg = scsi_sglist(sc); |
26b14823 | 199 | |
f10ab66f FT |
200 | dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc), |
201 | md->len, scsi_sg_count(sc)); | |
26b14823 | 202 | |
f10ab66f | 203 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
26b14823 FT |
204 | DMA_BIDIRECTIONAL); |
205 | if (!nsg) { | |
f10ab66f | 206 | printk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
26b14823 FT |
207 | return 0; |
208 | } | |
f10ab66f | 209 | len = min(scsi_bufflen(sc), md->len); |
26b14823 FT |
210 | } else |
211 | len = md->len; | |
212 | ||
213 | err = rdma_io(sc, sg, nsg, md, 1, dir, len); | |
214 | ||
215 | if (dma_map) | |
216 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
217 | ||
218 | return err; | |
219 | } | |
220 | ||
221 | static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
222 | struct srp_indirect_buf *id, | |
223 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
224 | int dma_map, int ext_desc) | |
225 | { | |
226 | struct iu_entry *iue = NULL; | |
227 | struct srp_direct_buf *md = NULL; | |
228 | struct scatterlist dummy, *sg = NULL; | |
229 | dma_addr_t token = 0; | |
ad1331a7 | 230 | int err = 0; |
26b14823 FT |
231 | int nmd, nsg = 0, len; |
232 | ||
233 | if (dma_map || ext_desc) { | |
234 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 235 | sg = scsi_sglist(sc); |
26b14823 FT |
236 | |
237 | dprintk("%p %u %u %d %d\n", | |
f10ab66f | 238 | iue, scsi_bufflen(sc), id->len, |
26b14823 FT |
239 | cmd->data_in_desc_cnt, cmd->data_out_desc_cnt); |
240 | } | |
241 | ||
242 | nmd = id->table_desc.len / sizeof(struct srp_direct_buf); | |
243 | ||
244 | if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) || | |
245 | (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) { | |
246 | md = &id->desc_list[0]; | |
247 | goto rdma; | |
248 | } | |
249 | ||
250 | if (ext_desc && dma_map) { | |
251 | md = dma_alloc_coherent(iue->target->dev, id->table_desc.len, | |
252 | &token, GFP_KERNEL); | |
253 | if (!md) { | |
254 | eprintk("Can't get dma memory %u\n", id->table_desc.len); | |
255 | return -ENOMEM; | |
256 | } | |
257 | ||
258 | sg_init_one(&dummy, md, id->table_desc.len); | |
259 | sg_dma_address(&dummy) = token; | |
bcd4e225 | 260 | sg_dma_len(&dummy) = id->table_desc.len; |
26b14823 FT |
261 | err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE, |
262 | id->table_desc.len); | |
ad1331a7 BB |
263 | if (err) { |
264 | eprintk("Error copying indirect table %d\n", err); | |
26b14823 FT |
265 | goto free_mem; |
266 | } | |
267 | } else { | |
268 | eprintk("This command uses external indirect buffer\n"); | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | rdma: | |
273 | if (dma_map) { | |
f10ab66f FT |
274 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
275 | DMA_BIDIRECTIONAL); | |
26b14823 | 276 | if (!nsg) { |
f10ab66f | 277 | eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
ad1331a7 | 278 | err = -EIO; |
26b14823 FT |
279 | goto free_mem; |
280 | } | |
f10ab66f | 281 | len = min(scsi_bufflen(sc), id->len); |
26b14823 FT |
282 | } else |
283 | len = id->len; | |
284 | ||
285 | err = rdma_io(sc, sg, nsg, md, nmd, dir, len); | |
286 | ||
287 | if (dma_map) | |
288 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
289 | ||
290 | free_mem: | |
291 | if (token && dma_map) | |
292 | dma_free_coherent(iue->target->dev, id->table_desc.len, md, token); | |
293 | ||
ad1331a7 | 294 | return err; |
26b14823 FT |
295 | } |
296 | ||
297 | static int data_out_desc_size(struct srp_cmd *cmd) | |
298 | { | |
299 | int size = 0; | |
300 | u8 fmt = cmd->buf_fmt >> 4; | |
301 | ||
302 | switch (fmt) { | |
303 | case SRP_NO_DATA_DESC: | |
304 | break; | |
305 | case SRP_DATA_DESC_DIRECT: | |
306 | size = sizeof(struct srp_direct_buf); | |
307 | break; | |
308 | case SRP_DATA_DESC_INDIRECT: | |
309 | size = sizeof(struct srp_indirect_buf) + | |
310 | sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt; | |
311 | break; | |
312 | default: | |
313 | eprintk("client error. Invalid data_out_format %x\n", fmt); | |
314 | break; | |
315 | } | |
316 | return size; | |
317 | } | |
318 | ||
319 | /* | |
320 | * TODO: this can be called multiple times for a single command if it | |
321 | * has very long data. | |
322 | */ | |
323 | int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
324 | srp_rdma_t rdma_io, int dma_map, int ext_desc) | |
325 | { | |
326 | struct srp_direct_buf *md; | |
327 | struct srp_indirect_buf *id; | |
328 | enum dma_data_direction dir; | |
329 | int offset, err = 0; | |
330 | u8 format; | |
331 | ||
78d85019 | 332 | offset = cmd->add_cdb_len & ~3; |
26b14823 FT |
333 | |
334 | dir = srp_cmd_direction(cmd); | |
335 | if (dir == DMA_FROM_DEVICE) | |
336 | offset += data_out_desc_size(cmd); | |
337 | ||
338 | if (dir == DMA_TO_DEVICE) | |
339 | format = cmd->buf_fmt >> 4; | |
340 | else | |
341 | format = cmd->buf_fmt & ((1U << 4) - 1); | |
342 | ||
343 | switch (format) { | |
344 | case SRP_NO_DATA_DESC: | |
345 | break; | |
346 | case SRP_DATA_DESC_DIRECT: | |
347 | md = (struct srp_direct_buf *) | |
348 | (cmd->add_data + offset); | |
349 | err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc); | |
350 | break; | |
351 | case SRP_DATA_DESC_INDIRECT: | |
352 | id = (struct srp_indirect_buf *) | |
353 | (cmd->add_data + offset); | |
354 | err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map, | |
355 | ext_desc); | |
356 | break; | |
357 | default: | |
358 | eprintk("Unknown format %d %x\n", dir, format); | |
ad1331a7 | 359 | err = -EINVAL; |
26b14823 FT |
360 | } |
361 | ||
362 | return err; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(srp_transfer_data); | |
365 | ||
366 | static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir) | |
367 | { | |
368 | struct srp_direct_buf *md; | |
369 | struct srp_indirect_buf *id; | |
78d85019 | 370 | int len = 0, offset = cmd->add_cdb_len & ~3; |
26b14823 FT |
371 | u8 fmt; |
372 | ||
373 | if (dir == DMA_TO_DEVICE) | |
374 | fmt = cmd->buf_fmt >> 4; | |
375 | else { | |
376 | fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
377 | offset += data_out_desc_size(cmd); | |
378 | } | |
379 | ||
380 | switch (fmt) { | |
381 | case SRP_NO_DATA_DESC: | |
382 | break; | |
383 | case SRP_DATA_DESC_DIRECT: | |
384 | md = (struct srp_direct_buf *) (cmd->add_data + offset); | |
385 | len = md->len; | |
386 | break; | |
387 | case SRP_DATA_DESC_INDIRECT: | |
388 | id = (struct srp_indirect_buf *) (cmd->add_data + offset); | |
389 | len = id->len; | |
390 | break; | |
391 | default: | |
392 | eprintk("invalid data format %x\n", fmt); | |
393 | break; | |
394 | } | |
395 | return len; | |
396 | } | |
397 | ||
398 | int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info, | |
17b0bcfa | 399 | u64 itn_id, u64 addr) |
26b14823 FT |
400 | { |
401 | enum dma_data_direction dir; | |
402 | struct scsi_cmnd *sc; | |
403 | int tag, len, err; | |
404 | ||
405 | switch (cmd->task_attr) { | |
406 | case SRP_SIMPLE_TASK: | |
407 | tag = MSG_SIMPLE_TAG; | |
408 | break; | |
409 | case SRP_ORDERED_TASK: | |
410 | tag = MSG_ORDERED_TAG; | |
411 | break; | |
412 | case SRP_HEAD_TASK: | |
413 | tag = MSG_HEAD_TAG; | |
414 | break; | |
415 | default: | |
416 | eprintk("Task attribute %d not supported\n", cmd->task_attr); | |
417 | tag = MSG_ORDERED_TAG; | |
418 | } | |
419 | ||
420 | dir = srp_cmd_direction(cmd); | |
421 | len = vscsis_data_length(cmd, dir); | |
422 | ||
423 | dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0], | |
424 | cmd->lun, dir, len, tag, (unsigned long long) cmd->tag); | |
425 | ||
426 | sc = scsi_host_get_command(shost, dir, GFP_KERNEL); | |
427 | if (!sc) | |
428 | return -ENOMEM; | |
429 | ||
430 | sc->SCp.ptr = info; | |
431 | memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE); | |
30b0c37b BH |
432 | sc->sdb.length = len; |
433 | sc->sdb.table.sgl = (void *) (unsigned long) addr; | |
26b14823 | 434 | sc->tag = tag; |
17b0bcfa FT |
435 | err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun, |
436 | cmd->tag); | |
26b14823 FT |
437 | if (err) |
438 | scsi_host_put_command(shost, sc); | |
439 | ||
440 | return err; | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(srp_cmd_queue); | |
443 | ||
40c4f3e4 | 444 | MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions"); |
26b14823 FT |
445 | MODULE_AUTHOR("FUJITA Tomonori"); |
446 | MODULE_LICENSE("GPL"); |