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> | |
acf3368f | 26 | #include <linux/module.h> |
26b14823 FT |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_cmnd.h> | |
29 | #include <scsi/scsi_tcq.h> | |
30 | #include <scsi/scsi_tgt.h> | |
31 | #include <scsi/srp.h> | |
32 | #include <scsi/libsrp.h> | |
33 | ||
34 | enum srp_task_attributes { | |
35 | SRP_SIMPLE_TASK = 0, | |
36 | SRP_HEAD_TASK = 1, | |
37 | SRP_ORDERED_TASK = 2, | |
38 | SRP_ACA_TASK = 4 | |
39 | }; | |
40 | ||
41 | /* tmp - will replace with SCSI logging stuff */ | |
42 | #define eprintk(fmt, args...) \ | |
43 | do { \ | |
cadbd4a5 | 44 | printk("%s(%d) " fmt, __func__, __LINE__, ##args); \ |
26b14823 FT |
45 | } while (0) |
46 | /* #define dprintk eprintk */ | |
47 | #define dprintk(fmt, args...) | |
48 | ||
49 | static int srp_iu_pool_alloc(struct srp_queue *q, size_t max, | |
50 | struct srp_buf **ring) | |
51 | { | |
52 | int i; | |
53 | struct iu_entry *iue; | |
54 | ||
55 | q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL); | |
56 | if (!q->pool) | |
57 | return -ENOMEM; | |
58 | q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL); | |
59 | if (!q->items) | |
60 | goto free_pool; | |
61 | ||
62 | spin_lock_init(&q->lock); | |
c1e13f25 | 63 | kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *)); |
26b14823 FT |
64 | |
65 | for (i = 0, iue = q->items; i < max; i++) { | |
7acd72eb | 66 | kfifo_in(&q->queue, (void *) &iue, sizeof(void *)); |
26b14823 FT |
67 | iue->sbuf = ring[i]; |
68 | iue++; | |
69 | } | |
70 | return 0; | |
71 | ||
26b14823 FT |
72 | kfree(q->items); |
73 | free_pool: | |
74 | kfree(q->pool); | |
75 | return -ENOMEM; | |
76 | } | |
77 | ||
78 | static void srp_iu_pool_free(struct srp_queue *q) | |
79 | { | |
80 | kfree(q->items); | |
81 | kfree(q->pool); | |
82 | } | |
83 | ||
84 | static struct srp_buf **srp_ring_alloc(struct device *dev, | |
85 | size_t max, size_t size) | |
86 | { | |
87 | int i; | |
88 | struct srp_buf **ring; | |
89 | ||
90 | ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL); | |
91 | if (!ring) | |
92 | return NULL; | |
93 | ||
94 | for (i = 0; i < max; i++) { | |
95 | ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL); | |
96 | if (!ring[i]) | |
97 | goto out; | |
98 | ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma, | |
99 | GFP_KERNEL); | |
100 | if (!ring[i]->buf) | |
101 | goto out; | |
102 | } | |
103 | return ring; | |
104 | ||
105 | out: | |
106 | for (i = 0; i < max && ring[i]; i++) { | |
107 | if (ring[i]->buf) | |
108 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
109 | kfree(ring[i]); | |
110 | } | |
111 | kfree(ring); | |
112 | ||
113 | return NULL; | |
114 | } | |
115 | ||
116 | static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max, | |
117 | size_t size) | |
118 | { | |
119 | int i; | |
120 | ||
121 | for (i = 0; i < max; i++) { | |
122 | dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma); | |
123 | kfree(ring[i]); | |
124 | } | |
afffd3da | 125 | kfree(ring); |
26b14823 FT |
126 | } |
127 | ||
128 | int srp_target_alloc(struct srp_target *target, struct device *dev, | |
129 | size_t nr, size_t iu_size) | |
130 | { | |
131 | int err; | |
132 | ||
133 | spin_lock_init(&target->lock); | |
134 | INIT_LIST_HEAD(&target->cmd_queue); | |
135 | ||
136 | target->dev = dev; | |
78c55d76 | 137 | dev_set_drvdata(target->dev, target); |
26b14823 FT |
138 | |
139 | target->srp_iu_size = iu_size; | |
140 | target->rx_ring_size = nr; | |
141 | target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size); | |
142 | if (!target->rx_ring) | |
143 | return -ENOMEM; | |
144 | err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring); | |
145 | if (err) | |
146 | goto free_ring; | |
147 | ||
148 | return 0; | |
149 | ||
150 | free_ring: | |
151 | srp_ring_free(target->dev, target->rx_ring, nr, iu_size); | |
152 | return -ENOMEM; | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(srp_target_alloc); | |
155 | ||
156 | void srp_target_free(struct srp_target *target) | |
157 | { | |
158 | srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size, | |
159 | target->srp_iu_size); | |
160 | srp_iu_pool_free(&target->iu_queue); | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(srp_target_free); | |
163 | ||
164 | struct iu_entry *srp_iu_get(struct srp_target *target) | |
165 | { | |
166 | struct iu_entry *iue = NULL; | |
167 | ||
9842c38e SS |
168 | if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue, |
169 | sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) { | |
170 | WARN_ONCE(1, "unexpected fifo state"); | |
171 | return NULL; | |
172 | } | |
26b14823 FT |
173 | if (!iue) |
174 | return iue; | |
175 | iue->target = target; | |
176 | INIT_LIST_HEAD(&iue->ilist); | |
177 | iue->flags = 0; | |
178 | return iue; | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(srp_iu_get); | |
181 | ||
182 | void srp_iu_put(struct iu_entry *iue) | |
183 | { | |
7acd72eb | 184 | kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue, |
c1e13f25 | 185 | sizeof(void *), &iue->target->iu_queue.lock); |
26b14823 FT |
186 | } |
187 | EXPORT_SYMBOL_GPL(srp_iu_put); | |
188 | ||
189 | static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md, | |
190 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
191 | int dma_map, int ext_desc) | |
192 | { | |
193 | struct iu_entry *iue = NULL; | |
194 | struct scatterlist *sg = NULL; | |
195 | int err, nsg = 0, len; | |
196 | ||
197 | if (dma_map) { | |
198 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 199 | sg = scsi_sglist(sc); |
26b14823 | 200 | |
f10ab66f FT |
201 | dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc), |
202 | md->len, scsi_sg_count(sc)); | |
26b14823 | 203 | |
f10ab66f | 204 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
26b14823 FT |
205 | DMA_BIDIRECTIONAL); |
206 | if (!nsg) { | |
f10ab66f | 207 | printk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
26b14823 FT |
208 | return 0; |
209 | } | |
f10ab66f | 210 | len = min(scsi_bufflen(sc), md->len); |
26b14823 FT |
211 | } else |
212 | len = md->len; | |
213 | ||
214 | err = rdma_io(sc, sg, nsg, md, 1, dir, len); | |
215 | ||
216 | if (dma_map) | |
217 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
218 | ||
219 | return err; | |
220 | } | |
221 | ||
222 | static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
223 | struct srp_indirect_buf *id, | |
224 | enum dma_data_direction dir, srp_rdma_t rdma_io, | |
225 | int dma_map, int ext_desc) | |
226 | { | |
227 | struct iu_entry *iue = NULL; | |
228 | struct srp_direct_buf *md = NULL; | |
229 | struct scatterlist dummy, *sg = NULL; | |
230 | dma_addr_t token = 0; | |
ad1331a7 | 231 | int err = 0; |
26b14823 FT |
232 | int nmd, nsg = 0, len; |
233 | ||
234 | if (dma_map || ext_desc) { | |
235 | iue = (struct iu_entry *) sc->SCp.ptr; | |
f10ab66f | 236 | sg = scsi_sglist(sc); |
26b14823 FT |
237 | |
238 | dprintk("%p %u %u %d %d\n", | |
f10ab66f | 239 | iue, scsi_bufflen(sc), id->len, |
26b14823 FT |
240 | cmd->data_in_desc_cnt, cmd->data_out_desc_cnt); |
241 | } | |
242 | ||
243 | nmd = id->table_desc.len / sizeof(struct srp_direct_buf); | |
244 | ||
245 | if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) || | |
246 | (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) { | |
247 | md = &id->desc_list[0]; | |
248 | goto rdma; | |
249 | } | |
250 | ||
251 | if (ext_desc && dma_map) { | |
252 | md = dma_alloc_coherent(iue->target->dev, id->table_desc.len, | |
253 | &token, GFP_KERNEL); | |
254 | if (!md) { | |
255 | eprintk("Can't get dma memory %u\n", id->table_desc.len); | |
256 | return -ENOMEM; | |
257 | } | |
258 | ||
259 | sg_init_one(&dummy, md, id->table_desc.len); | |
260 | sg_dma_address(&dummy) = token; | |
bcd4e225 | 261 | sg_dma_len(&dummy) = id->table_desc.len; |
26b14823 FT |
262 | err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE, |
263 | id->table_desc.len); | |
ad1331a7 BB |
264 | if (err) { |
265 | eprintk("Error copying indirect table %d\n", err); | |
26b14823 FT |
266 | goto free_mem; |
267 | } | |
268 | } else { | |
269 | eprintk("This command uses external indirect buffer\n"); | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | rdma: | |
274 | if (dma_map) { | |
f10ab66f FT |
275 | nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc), |
276 | DMA_BIDIRECTIONAL); | |
26b14823 | 277 | if (!nsg) { |
f10ab66f | 278 | eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc)); |
ad1331a7 | 279 | err = -EIO; |
26b14823 FT |
280 | goto free_mem; |
281 | } | |
f10ab66f | 282 | len = min(scsi_bufflen(sc), id->len); |
26b14823 FT |
283 | } else |
284 | len = id->len; | |
285 | ||
286 | err = rdma_io(sc, sg, nsg, md, nmd, dir, len); | |
287 | ||
288 | if (dma_map) | |
289 | dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL); | |
290 | ||
291 | free_mem: | |
292 | if (token && dma_map) | |
293 | dma_free_coherent(iue->target->dev, id->table_desc.len, md, token); | |
294 | ||
ad1331a7 | 295 | return err; |
26b14823 FT |
296 | } |
297 | ||
298 | static int data_out_desc_size(struct srp_cmd *cmd) | |
299 | { | |
300 | int size = 0; | |
301 | u8 fmt = cmd->buf_fmt >> 4; | |
302 | ||
303 | switch (fmt) { | |
304 | case SRP_NO_DATA_DESC: | |
305 | break; | |
306 | case SRP_DATA_DESC_DIRECT: | |
307 | size = sizeof(struct srp_direct_buf); | |
308 | break; | |
309 | case SRP_DATA_DESC_INDIRECT: | |
310 | size = sizeof(struct srp_indirect_buf) + | |
311 | sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt; | |
312 | break; | |
313 | default: | |
314 | eprintk("client error. Invalid data_out_format %x\n", fmt); | |
315 | break; | |
316 | } | |
317 | return size; | |
318 | } | |
319 | ||
320 | /* | |
321 | * TODO: this can be called multiple times for a single command if it | |
322 | * has very long data. | |
323 | */ | |
324 | int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd, | |
325 | srp_rdma_t rdma_io, int dma_map, int ext_desc) | |
326 | { | |
327 | struct srp_direct_buf *md; | |
328 | struct srp_indirect_buf *id; | |
329 | enum dma_data_direction dir; | |
330 | int offset, err = 0; | |
331 | u8 format; | |
332 | ||
78d85019 | 333 | offset = cmd->add_cdb_len & ~3; |
26b14823 FT |
334 | |
335 | dir = srp_cmd_direction(cmd); | |
336 | if (dir == DMA_FROM_DEVICE) | |
337 | offset += data_out_desc_size(cmd); | |
338 | ||
339 | if (dir == DMA_TO_DEVICE) | |
340 | format = cmd->buf_fmt >> 4; | |
341 | else | |
342 | format = cmd->buf_fmt & ((1U << 4) - 1); | |
343 | ||
344 | switch (format) { | |
345 | case SRP_NO_DATA_DESC: | |
346 | break; | |
347 | case SRP_DATA_DESC_DIRECT: | |
348 | md = (struct srp_direct_buf *) | |
349 | (cmd->add_data + offset); | |
350 | err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc); | |
351 | break; | |
352 | case SRP_DATA_DESC_INDIRECT: | |
353 | id = (struct srp_indirect_buf *) | |
354 | (cmd->add_data + offset); | |
355 | err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map, | |
356 | ext_desc); | |
357 | break; | |
358 | default: | |
359 | eprintk("Unknown format %d %x\n", dir, format); | |
ad1331a7 | 360 | err = -EINVAL; |
26b14823 FT |
361 | } |
362 | ||
363 | return err; | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(srp_transfer_data); | |
366 | ||
367 | static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir) | |
368 | { | |
369 | struct srp_direct_buf *md; | |
370 | struct srp_indirect_buf *id; | |
78d85019 | 371 | int len = 0, offset = cmd->add_cdb_len & ~3; |
26b14823 FT |
372 | u8 fmt; |
373 | ||
374 | if (dir == DMA_TO_DEVICE) | |
375 | fmt = cmd->buf_fmt >> 4; | |
376 | else { | |
377 | fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
378 | offset += data_out_desc_size(cmd); | |
379 | } | |
380 | ||
381 | switch (fmt) { | |
382 | case SRP_NO_DATA_DESC: | |
383 | break; | |
384 | case SRP_DATA_DESC_DIRECT: | |
385 | md = (struct srp_direct_buf *) (cmd->add_data + offset); | |
386 | len = md->len; | |
387 | break; | |
388 | case SRP_DATA_DESC_INDIRECT: | |
389 | id = (struct srp_indirect_buf *) (cmd->add_data + offset); | |
390 | len = id->len; | |
391 | break; | |
392 | default: | |
393 | eprintk("invalid data format %x\n", fmt); | |
394 | break; | |
395 | } | |
396 | return len; | |
397 | } | |
398 | ||
399 | int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info, | |
17b0bcfa | 400 | u64 itn_id, u64 addr) |
26b14823 FT |
401 | { |
402 | enum dma_data_direction dir; | |
403 | struct scsi_cmnd *sc; | |
404 | int tag, len, err; | |
405 | ||
406 | switch (cmd->task_attr) { | |
407 | case SRP_SIMPLE_TASK: | |
408 | tag = MSG_SIMPLE_TAG; | |
409 | break; | |
410 | case SRP_ORDERED_TASK: | |
411 | tag = MSG_ORDERED_TAG; | |
412 | break; | |
413 | case SRP_HEAD_TASK: | |
414 | tag = MSG_HEAD_TAG; | |
415 | break; | |
416 | default: | |
417 | eprintk("Task attribute %d not supported\n", cmd->task_attr); | |
418 | tag = MSG_ORDERED_TAG; | |
419 | } | |
420 | ||
421 | dir = srp_cmd_direction(cmd); | |
422 | len = vscsis_data_length(cmd, dir); | |
423 | ||
424 | dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0], | |
425 | cmd->lun, dir, len, tag, (unsigned long long) cmd->tag); | |
426 | ||
427 | sc = scsi_host_get_command(shost, dir, GFP_KERNEL); | |
428 | if (!sc) | |
429 | return -ENOMEM; | |
430 | ||
431 | sc->SCp.ptr = info; | |
432 | memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE); | |
30b0c37b BH |
433 | sc->sdb.length = len; |
434 | sc->sdb.table.sgl = (void *) (unsigned long) addr; | |
26b14823 | 435 | sc->tag = tag; |
17b0bcfa FT |
436 | err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun, |
437 | cmd->tag); | |
26b14823 FT |
438 | if (err) |
439 | scsi_host_put_command(shost, sc); | |
440 | ||
441 | return err; | |
442 | } | |
443 | EXPORT_SYMBOL_GPL(srp_cmd_queue); | |
444 | ||
40c4f3e4 | 445 | MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions"); |
26b14823 FT |
446 | MODULE_AUTHOR("FUJITA Tomonori"); |
447 | MODULE_LICENSE("GPL"); |