blob: 84f937f11d475870710abbbfc746b06c4160b5f3 [file] [log] [blame]
Andy Grover7875e182009-02-24 15:30:26 +00001/*
2 * Copyright (c) 2006 Oracle. 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 */
33#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Andy Grover7875e182009-02-24 15:30:26 +000035
36#include "rds.h"
Andy Grover7875e182009-02-24 15:30:26 +000037
Andy Grover7875e182009-02-24 15:30:26 +000038static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
39[RDS_EXTHDR_NONE] = 0,
40[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
41[RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma),
42[RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest),
43};
44
45
46void rds_message_addref(struct rds_message *rm)
47{
48 rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
49 atomic_inc(&rm->m_refcount);
50}
Andy Grover616b7572009-08-21 12:28:32 +000051EXPORT_SYMBOL_GPL(rds_message_addref);
Andy Grover7875e182009-02-24 15:30:26 +000052
53/*
54 * This relies on dma_map_sg() not touching sg[].page during merging.
55 */
56static void rds_message_purge(struct rds_message *rm)
57{
58 unsigned long i;
59
60 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
61 return;
62
Andy Grover6c7cc6e2010-01-27 18:04:18 -080063 for (i = 0; i < rm->data.op_nents; i++) {
64 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.op_sg[i]));
Andy Grover7875e182009-02-24 15:30:26 +000065 /* XXX will have to put_page for page refs */
Andy Grover6c7cc6e2010-01-27 18:04:18 -080066 __free_page(sg_page(&rm->data.op_sg[i]));
Andy Grover7875e182009-02-24 15:30:26 +000067 }
Andy Grover6c7cc6e2010-01-27 18:04:18 -080068 rm->data.op_nents = 0;
Andy Grover7875e182009-02-24 15:30:26 +000069
Andy Groverf8b3aaf2010-03-01 14:11:53 -080070 if (rm->rdma.op_active)
71 rds_rdma_free_op(&rm->rdma);
72 if (rm->rdma.op_rdma_mr)
73 rds_mr_put(rm->rdma.op_rdma_mr);
Andy Groverd0ab25a2010-01-27 16:15:48 -080074
75 if (rm->atomic.op_active)
76 rds_atomic_free_op(&rm->atomic);
77 if (rm->atomic.op_rdma_mr)
78 rds_mr_put(rm->atomic.op_rdma_mr);
Andy Grover7875e182009-02-24 15:30:26 +000079}
80
Andy Grover7875e182009-02-24 15:30:26 +000081void rds_message_put(struct rds_message *rm)
82{
83 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
Chris Mason7e3f2952010-05-11 15:11:11 -070084 if (atomic_read(&rm->m_refcount) == 0) {
85printk(KERN_CRIT "danger refcount zero on %p\n", rm);
86WARN_ON(1);
87 }
Andy Grover7875e182009-02-24 15:30:26 +000088 if (atomic_dec_and_test(&rm->m_refcount)) {
89 BUG_ON(!list_empty(&rm->m_sock_item));
90 BUG_ON(!list_empty(&rm->m_conn_item));
91 rds_message_purge(rm);
92
93 kfree(rm);
94 }
95}
Andy Grover616b7572009-08-21 12:28:32 +000096EXPORT_SYMBOL_GPL(rds_message_put);
Andy Grover7875e182009-02-24 15:30:26 +000097
Andy Grover7875e182009-02-24 15:30:26 +000098void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
99 __be16 dport, u64 seq)
100{
101 hdr->h_flags = 0;
102 hdr->h_sport = sport;
103 hdr->h_dport = dport;
104 hdr->h_sequence = cpu_to_be64(seq);
105 hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
106}
Andy Grover616b7572009-08-21 12:28:32 +0000107EXPORT_SYMBOL_GPL(rds_message_populate_header);
Andy Grover7875e182009-02-24 15:30:26 +0000108
109int rds_message_add_extension(struct rds_header *hdr,
110 unsigned int type, const void *data, unsigned int len)
111{
112 unsigned int ext_len = sizeof(u8) + len;
113 unsigned char *dst;
114
115 /* For now, refuse to add more than one extension header */
116 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
117 return 0;
118
Joe Perchesf64f9e72009-11-29 16:55:45 -0800119 if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
Andy Grover7875e182009-02-24 15:30:26 +0000120 return 0;
121
122 if (ext_len >= RDS_HEADER_EXT_SPACE)
123 return 0;
124 dst = hdr->h_exthdr;
125
126 *dst++ = type;
127 memcpy(dst, data, len);
128
129 dst[len] = RDS_EXTHDR_NONE;
130 return 1;
131}
Andy Grover616b7572009-08-21 12:28:32 +0000132EXPORT_SYMBOL_GPL(rds_message_add_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000133
134/*
135 * If a message has extension headers, retrieve them here.
136 * Call like this:
137 *
138 * unsigned int pos = 0;
139 *
140 * while (1) {
141 * buflen = sizeof(buffer);
142 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
143 * if (type == RDS_EXTHDR_NONE)
144 * break;
145 * ...
146 * }
147 */
148int rds_message_next_extension(struct rds_header *hdr,
149 unsigned int *pos, void *buf, unsigned int *buflen)
150{
151 unsigned int offset, ext_type, ext_len;
152 u8 *src = hdr->h_exthdr;
153
154 offset = *pos;
155 if (offset >= RDS_HEADER_EXT_SPACE)
156 goto none;
157
158 /* Get the extension type and length. For now, the
159 * length is implied by the extension type. */
160 ext_type = src[offset++];
161
162 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
163 goto none;
164 ext_len = rds_exthdr_size[ext_type];
165 if (offset + ext_len > RDS_HEADER_EXT_SPACE)
166 goto none;
167
168 *pos = offset + ext_len;
169 if (ext_len < *buflen)
170 *buflen = ext_len;
171 memcpy(buf, src + offset, *buflen);
172 return ext_type;
173
174none:
175 *pos = RDS_HEADER_EXT_SPACE;
176 *buflen = 0;
177 return RDS_EXTHDR_NONE;
178}
179
180int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version)
181{
182 struct rds_ext_header_version ext_hdr;
183
184 ext_hdr.h_version = cpu_to_be32(version);
185 return rds_message_add_extension(hdr, RDS_EXTHDR_VERSION, &ext_hdr, sizeof(ext_hdr));
186}
187
188int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version)
189{
190 struct rds_ext_header_version ext_hdr;
191 unsigned int pos = 0, len = sizeof(ext_hdr);
192
193 /* We assume the version extension is the only one present */
194 if (rds_message_next_extension(hdr, &pos, &ext_hdr, &len) != RDS_EXTHDR_VERSION)
195 return 0;
196 *version = be32_to_cpu(ext_hdr.h_version);
197 return 1;
198}
199
200int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
201{
202 struct rds_ext_header_rdma_dest ext_hdr;
203
204 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
205 ext_hdr.h_rdma_offset = cpu_to_be32(offset);
206 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
207}
Andy Grover616b7572009-08-21 12:28:32 +0000208EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000209
Andy Groverfc445082010-01-12 12:56:06 -0800210/*
211 * Each rds_message is allocated with extra space for the scatterlist entries
212 * rds ops will need. This is to minimize memory allocation count. Then, each rds op
213 * can grab SGs when initializing its part of the rds_message.
214 */
215struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
Andy Grover7875e182009-02-24 15:30:26 +0000216{
217 struct rds_message *rm;
218
Andy Groverfc445082010-01-12 12:56:06 -0800219 rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
Andy Grover7875e182009-02-24 15:30:26 +0000220 if (!rm)
221 goto out;
222
Andy Groverfc445082010-01-12 12:56:06 -0800223 rm->m_used_sgs = 0;
224 rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
225
Andy Grover7875e182009-02-24 15:30:26 +0000226 atomic_set(&rm->m_refcount, 1);
227 INIT_LIST_HEAD(&rm->m_sock_item);
228 INIT_LIST_HEAD(&rm->m_conn_item);
229 spin_lock_init(&rm->m_rs_lock);
Chris Masonc83188d2010-04-21 13:09:28 -0700230 init_waitqueue_head(&rm->m_flush_wait);
Andy Grover7875e182009-02-24 15:30:26 +0000231
232out:
233 return rm;
234}
235
Andy Groverfc445082010-01-12 12:56:06 -0800236/*
237 * RDS ops use this to grab SG entries from the rm's sg pool.
238 */
239struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
240{
241 struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
242 struct scatterlist *sg_ret;
243
244 WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
Andy Groveree4c7b42010-02-03 19:41:52 -0800245 WARN_ON(!nents);
Andy Groverfc445082010-01-12 12:56:06 -0800246
247 sg_ret = &sg_first[rm->m_used_sgs];
Andy Groverf4dd96f72010-01-12 14:17:31 -0800248 sg_init_table(sg_ret, nents);
Andy Groverfc445082010-01-12 12:56:06 -0800249 rm->m_used_sgs += nents;
250
251 return sg_ret;
252}
253
Andy Grover7875e182009-02-24 15:30:26 +0000254struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
255{
256 struct rds_message *rm;
257 unsigned int i;
Andy Groverff87e972010-01-12 14:13:15 -0800258 int num_sgs = ceil(total_len, PAGE_SIZE);
259 int extra_bytes = num_sgs * sizeof(struct scatterlist);
Andy Grover7875e182009-02-24 15:30:26 +0000260
Andy Groverf2ec76f2010-03-29 16:46:46 -0700261 rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
Andy Grover8690bfa2010-01-12 11:56:44 -0800262 if (!rm)
Andy Grover7875e182009-02-24 15:30:26 +0000263 return ERR_PTR(-ENOMEM);
264
265 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
266 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800267 rm->data.op_nents = ceil(total_len, PAGE_SIZE);
268 rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
Andy Grover7875e182009-02-24 15:30:26 +0000269
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800270 for (i = 0; i < rm->data.op_nents; ++i) {
271 sg_set_page(&rm->data.op_sg[i],
Andy Grover7875e182009-02-24 15:30:26 +0000272 virt_to_page(page_addrs[i]),
273 PAGE_SIZE, 0);
274 }
275
276 return rm;
277}
278
Andy Groverfc445082010-01-12 12:56:06 -0800279int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
Andy Grover7875e182009-02-24 15:30:26 +0000280 size_t total_len)
281{
282 unsigned long to_copy;
283 unsigned long iov_off;
284 unsigned long sg_off;
Andy Grover7875e182009-02-24 15:30:26 +0000285 struct iovec *iov;
286 struct scatterlist *sg;
Andy Groverfc445082010-01-12 12:56:06 -0800287 int ret = 0;
Andy Grover7875e182009-02-24 15:30:26 +0000288
289 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
290
291 /*
292 * now allocate and copy in the data payload.
293 */
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800294 sg = rm->data.op_sg;
Andy Grover7875e182009-02-24 15:30:26 +0000295 iov = first_iov;
296 iov_off = 0;
297 sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
298
299 while (total_len) {
Andy Grover8690bfa2010-01-12 11:56:44 -0800300 if (!sg_page(sg)) {
Andy Grover7875e182009-02-24 15:30:26 +0000301 ret = rds_page_remainder_alloc(sg, total_len,
302 GFP_HIGHUSER);
303 if (ret)
304 goto out;
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800305 rm->data.op_nents++;
Andy Grover7875e182009-02-24 15:30:26 +0000306 sg_off = 0;
307 }
308
309 while (iov_off == iov->iov_len) {
310 iov_off = 0;
311 iov++;
312 }
313
314 to_copy = min(iov->iov_len - iov_off, sg->length - sg_off);
315 to_copy = min_t(size_t, to_copy, total_len);
316
317 rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to "
318 "sg [%p, %u, %u] + %lu\n",
319 to_copy, iov->iov_base, iov->iov_len, iov_off,
320 (void *)sg_page(sg), sg->offset, sg->length, sg_off);
321
322 ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off,
323 iov->iov_base + iov_off,
324 to_copy);
325 if (ret)
326 goto out;
327
328 iov_off += to_copy;
329 total_len -= to_copy;
330 sg_off += to_copy;
331
332 if (sg_off == sg->length)
333 sg++;
334 }
335
Andy Grover7875e182009-02-24 15:30:26 +0000336out:
Andy Groverfc445082010-01-12 12:56:06 -0800337 return ret;
Andy Grover7875e182009-02-24 15:30:26 +0000338}
339
340int rds_message_inc_copy_to_user(struct rds_incoming *inc,
341 struct iovec *first_iov, size_t size)
342{
343 struct rds_message *rm;
344 struct iovec *iov;
345 struct scatterlist *sg;
346 unsigned long to_copy;
347 unsigned long iov_off;
348 unsigned long vec_off;
349 int copied;
350 int ret;
351 u32 len;
352
353 rm = container_of(inc, struct rds_message, m_inc);
354 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
355
356 iov = first_iov;
357 iov_off = 0;
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800358 sg = rm->data.op_sg;
Andy Grover7875e182009-02-24 15:30:26 +0000359 vec_off = 0;
360 copied = 0;
361
362 while (copied < size && copied < len) {
363 while (iov_off == iov->iov_len) {
364 iov_off = 0;
365 iov++;
366 }
367
368 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off);
369 to_copy = min_t(size_t, to_copy, size - copied);
370 to_copy = min_t(unsigned long, to_copy, len - copied);
371
372 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to "
373 "sg [%p, %u, %u] + %lu\n",
374 to_copy, iov->iov_base, iov->iov_len, iov_off,
375 sg_page(sg), sg->offset, sg->length, vec_off);
376
377 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off,
378 iov->iov_base + iov_off,
379 to_copy);
380 if (ret) {
381 copied = ret;
382 break;
383 }
384
385 iov_off += to_copy;
386 vec_off += to_copy;
387 copied += to_copy;
388
389 if (vec_off == sg->length) {
390 vec_off = 0;
391 sg++;
392 }
393 }
394
395 return copied;
396}
397
398/*
399 * If the message is still on the send queue, wait until the transport
400 * is done with it. This is particularly important for RDMA operations.
401 */
402void rds_message_wait(struct rds_message *rm)
403{
Chris Masonc83188d2010-04-21 13:09:28 -0700404 wait_event_interruptible(rm->m_flush_wait,
Andy Grover7875e182009-02-24 15:30:26 +0000405 !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
406}
407
408void rds_message_unmapped(struct rds_message *rm)
409{
410 clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
Chris Masonc83188d2010-04-21 13:09:28 -0700411 wake_up_interruptible(&rm->m_flush_wait);
Andy Grover7875e182009-02-24 15:30:26 +0000412}
Andy Grover616b7572009-08-21 12:28:32 +0000413EXPORT_SYMBOL_GPL(rds_message_unmapped);
Andy Grover7875e182009-02-24 15:30:26 +0000414