blob: 5a21e6f5986f1b822e41077f54f5f6235fe47068 [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040035#include <linux/export.h>
Andy Grover7875e182009-02-24 15:30:26 +000036
37#include "rds.h"
Andy Grover7875e182009-02-24 15:30:26 +000038
Andy Grover7875e182009-02-24 15:30:26 +000039static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
40[RDS_EXTHDR_NONE] = 0,
41[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
42[RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma),
43[RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest),
44};
45
46
47void rds_message_addref(struct rds_message *rm)
48{
49 rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
50 atomic_inc(&rm->m_refcount);
51}
Andy Grover616b7572009-08-21 12:28:32 +000052EXPORT_SYMBOL_GPL(rds_message_addref);
Andy Grover7875e182009-02-24 15:30:26 +000053
54/*
55 * This relies on dma_map_sg() not touching sg[].page during merging.
56 */
57static void rds_message_purge(struct rds_message *rm)
58{
59 unsigned long i;
60
61 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags)))
62 return;
63
Andy Grover6c7cc6e2010-01-27 18:04:18 -080064 for (i = 0; i < rm->data.op_nents; i++) {
65 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.op_sg[i]));
Andy Grover7875e182009-02-24 15:30:26 +000066 /* XXX will have to put_page for page refs */
Andy Grover6c7cc6e2010-01-27 18:04:18 -080067 __free_page(sg_page(&rm->data.op_sg[i]));
Andy Grover7875e182009-02-24 15:30:26 +000068 }
Andy Grover6c7cc6e2010-01-27 18:04:18 -080069 rm->data.op_nents = 0;
Andy Grover7875e182009-02-24 15:30:26 +000070
Andy Groverf8b3aaf2010-03-01 14:11:53 -080071 if (rm->rdma.op_active)
72 rds_rdma_free_op(&rm->rdma);
73 if (rm->rdma.op_rdma_mr)
74 rds_mr_put(rm->rdma.op_rdma_mr);
Andy Groverd0ab25a2010-01-27 16:15:48 -080075
76 if (rm->atomic.op_active)
77 rds_atomic_free_op(&rm->atomic);
78 if (rm->atomic.op_rdma_mr)
79 rds_mr_put(rm->atomic.op_rdma_mr);
Andy Grover7875e182009-02-24 15:30:26 +000080}
81
Andy Grover7875e182009-02-24 15:30:26 +000082void rds_message_put(struct rds_message *rm)
83{
84 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount));
Cong Wang7dac1b52013-03-03 20:57:18 +000085 WARN(!atomic_read(&rm->m_refcount), "danger refcount zero on %p\n", rm);
Andy Grover7875e182009-02-24 15:30:26 +000086 if (atomic_dec_and_test(&rm->m_refcount)) {
87 BUG_ON(!list_empty(&rm->m_sock_item));
88 BUG_ON(!list_empty(&rm->m_conn_item));
89 rds_message_purge(rm);
90
91 kfree(rm);
92 }
93}
Andy Grover616b7572009-08-21 12:28:32 +000094EXPORT_SYMBOL_GPL(rds_message_put);
Andy Grover7875e182009-02-24 15:30:26 +000095
Andy Grover7875e182009-02-24 15:30:26 +000096void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
97 __be16 dport, u64 seq)
98{
99 hdr->h_flags = 0;
100 hdr->h_sport = sport;
101 hdr->h_dport = dport;
102 hdr->h_sequence = cpu_to_be64(seq);
103 hdr->h_exthdr[0] = RDS_EXTHDR_NONE;
104}
Andy Grover616b7572009-08-21 12:28:32 +0000105EXPORT_SYMBOL_GPL(rds_message_populate_header);
Andy Grover7875e182009-02-24 15:30:26 +0000106
stephen hemmingerff51bf82010-10-19 08:08:33 +0000107int rds_message_add_extension(struct rds_header *hdr, unsigned int type,
108 const void *data, unsigned int len)
Andy Grover7875e182009-02-24 15:30:26 +0000109{
110 unsigned int ext_len = sizeof(u8) + len;
111 unsigned char *dst;
112
113 /* For now, refuse to add more than one extension header */
114 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE)
115 return 0;
116
Joe Perchesf64f9e72009-11-29 16:55:45 -0800117 if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type])
Andy Grover7875e182009-02-24 15:30:26 +0000118 return 0;
119
120 if (ext_len >= RDS_HEADER_EXT_SPACE)
121 return 0;
122 dst = hdr->h_exthdr;
123
124 *dst++ = type;
125 memcpy(dst, data, len);
126
127 dst[len] = RDS_EXTHDR_NONE;
128 return 1;
129}
Andy Grover616b7572009-08-21 12:28:32 +0000130EXPORT_SYMBOL_GPL(rds_message_add_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000131
132/*
133 * If a message has extension headers, retrieve them here.
134 * Call like this:
135 *
136 * unsigned int pos = 0;
137 *
138 * while (1) {
139 * buflen = sizeof(buffer);
140 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen);
141 * if (type == RDS_EXTHDR_NONE)
142 * break;
143 * ...
144 * }
145 */
146int rds_message_next_extension(struct rds_header *hdr,
147 unsigned int *pos, void *buf, unsigned int *buflen)
148{
149 unsigned int offset, ext_type, ext_len;
150 u8 *src = hdr->h_exthdr;
151
152 offset = *pos;
153 if (offset >= RDS_HEADER_EXT_SPACE)
154 goto none;
155
156 /* Get the extension type and length. For now, the
157 * length is implied by the extension type. */
158 ext_type = src[offset++];
159
160 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX)
161 goto none;
162 ext_len = rds_exthdr_size[ext_type];
163 if (offset + ext_len > RDS_HEADER_EXT_SPACE)
164 goto none;
165
166 *pos = offset + ext_len;
167 if (ext_len < *buflen)
168 *buflen = ext_len;
169 memcpy(buf, src + offset, *buflen);
170 return ext_type;
171
172none:
173 *pos = RDS_HEADER_EXT_SPACE;
174 *buflen = 0;
175 return RDS_EXTHDR_NONE;
176}
177
Andy Grover7875e182009-02-24 15:30:26 +0000178int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset)
179{
180 struct rds_ext_header_rdma_dest ext_hdr;
181
182 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key);
183 ext_hdr.h_rdma_offset = cpu_to_be32(offset);
184 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr));
185}
Andy Grover616b7572009-08-21 12:28:32 +0000186EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension);
Andy Grover7875e182009-02-24 15:30:26 +0000187
Andy Groverfc445082010-01-12 12:56:06 -0800188/*
189 * Each rds_message is allocated with extra space for the scatterlist entries
190 * rds ops will need. This is to minimize memory allocation count. Then, each rds op
191 * can grab SGs when initializing its part of the rds_message.
192 */
193struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
Andy Grover7875e182009-02-24 15:30:26 +0000194{
195 struct rds_message *rm;
196
Cong Wangece6b0a2013-03-03 16:18:11 +0000197 if (extra_len > KMALLOC_MAX_SIZE - sizeof(struct rds_message))
198 return NULL;
199
Andy Groverfc445082010-01-12 12:56:06 -0800200 rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp);
Andy Grover7875e182009-02-24 15:30:26 +0000201 if (!rm)
202 goto out;
203
Andy Groverfc445082010-01-12 12:56:06 -0800204 rm->m_used_sgs = 0;
205 rm->m_total_sgs = extra_len / sizeof(struct scatterlist);
206
Andy Grover7875e182009-02-24 15:30:26 +0000207 atomic_set(&rm->m_refcount, 1);
208 INIT_LIST_HEAD(&rm->m_sock_item);
209 INIT_LIST_HEAD(&rm->m_conn_item);
210 spin_lock_init(&rm->m_rs_lock);
Chris Masonc83188d2010-04-21 13:09:28 -0700211 init_waitqueue_head(&rm->m_flush_wait);
Andy Grover7875e182009-02-24 15:30:26 +0000212
213out:
214 return rm;
215}
216
Andy Groverfc445082010-01-12 12:56:06 -0800217/*
218 * RDS ops use this to grab SG entries from the rm's sg pool.
219 */
220struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
221{
222 struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
223 struct scatterlist *sg_ret;
224
225 WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
Andy Groveree4c7b42010-02-03 19:41:52 -0800226 WARN_ON(!nents);
Andy Groverfc445082010-01-12 12:56:06 -0800227
Andy Groverd139ff02010-10-28 15:40:59 +0000228 if (rm->m_used_sgs + nents > rm->m_total_sgs)
229 return NULL;
230
Andy Groverfc445082010-01-12 12:56:06 -0800231 sg_ret = &sg_first[rm->m_used_sgs];
Andy Groverf4dd96f72010-01-12 14:17:31 -0800232 sg_init_table(sg_ret, nents);
Andy Groverfc445082010-01-12 12:56:06 -0800233 rm->m_used_sgs += nents;
234
235 return sg_ret;
236}
237
Andy Grover7875e182009-02-24 15:30:26 +0000238struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len)
239{
240 struct rds_message *rm;
241 unsigned int i;
Andy Groverff87e972010-01-12 14:13:15 -0800242 int num_sgs = ceil(total_len, PAGE_SIZE);
243 int extra_bytes = num_sgs * sizeof(struct scatterlist);
Andy Grover7875e182009-02-24 15:30:26 +0000244
Andy Groverf2ec76f2010-03-29 16:46:46 -0700245 rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
Andy Grover8690bfa2010-01-12 11:56:44 -0800246 if (!rm)
Andy Grover7875e182009-02-24 15:30:26 +0000247 return ERR_PTR(-ENOMEM);
248
249 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
250 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800251 rm->data.op_nents = ceil(total_len, PAGE_SIZE);
252 rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
Pavel Emelyanovaa581632010-11-08 06:20:50 +0000253 if (!rm->data.op_sg) {
254 rds_message_put(rm);
Andy Groverd139ff02010-10-28 15:40:59 +0000255 return ERR_PTR(-ENOMEM);
Pavel Emelyanovaa581632010-11-08 06:20:50 +0000256 }
Andy Grover7875e182009-02-24 15:30:26 +0000257
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800258 for (i = 0; i < rm->data.op_nents; ++i) {
259 sg_set_page(&rm->data.op_sg[i],
Andy Grover7875e182009-02-24 15:30:26 +0000260 virt_to_page(page_addrs[i]),
261 PAGE_SIZE, 0);
262 }
263
264 return rm;
265}
266
Al Viro083735f2014-11-20 09:31:08 -0500267int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from)
Andy Grover7875e182009-02-24 15:30:26 +0000268{
269 unsigned long to_copy;
Andy Grover7875e182009-02-24 15:30:26 +0000270 unsigned long sg_off;
Andy Grover7875e182009-02-24 15:30:26 +0000271 struct scatterlist *sg;
Andy Groverfc445082010-01-12 12:56:06 -0800272 int ret = 0;
Andy Grover7875e182009-02-24 15:30:26 +0000273
Al Viro083735f2014-11-20 09:31:08 -0500274 rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
Andy Grover7875e182009-02-24 15:30:26 +0000275
276 /*
277 * now allocate and copy in the data payload.
278 */
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800279 sg = rm->data.op_sg;
Andy Grover7875e182009-02-24 15:30:26 +0000280 sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */
281
Al Viro083735f2014-11-20 09:31:08 -0500282 while (iov_iter_count(from)) {
Andy Grover8690bfa2010-01-12 11:56:44 -0800283 if (!sg_page(sg)) {
Al Viro083735f2014-11-20 09:31:08 -0500284 ret = rds_page_remainder_alloc(sg, iov_iter_count(from),
Andy Grover7875e182009-02-24 15:30:26 +0000285 GFP_HIGHUSER);
286 if (ret)
Al Viro083735f2014-11-20 09:31:08 -0500287 return ret;
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800288 rm->data.op_nents++;
Andy Grover7875e182009-02-24 15:30:26 +0000289 sg_off = 0;
290 }
291
Al Viro083735f2014-11-20 09:31:08 -0500292 to_copy = min_t(unsigned long, iov_iter_count(from),
293 sg->length - sg_off);
Andy Grover7875e182009-02-24 15:30:26 +0000294
Al Viro083735f2014-11-20 09:31:08 -0500295 rds_stats_add(s_copy_from_user, to_copy);
296 ret = copy_page_from_iter(sg_page(sg), sg->offset + sg_off,
297 to_copy, from);
298 if (ret != to_copy)
299 return -EFAULT;
Andy Grover7875e182009-02-24 15:30:26 +0000300
Andy Grover7875e182009-02-24 15:30:26 +0000301 sg_off += to_copy;
302
303 if (sg_off == sg->length)
304 sg++;
305 }
306
Andy Groverfc445082010-01-12 12:56:06 -0800307 return ret;
Andy Grover7875e182009-02-24 15:30:26 +0000308}
309
Al Viroc310e722014-11-20 09:21:14 -0500310int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to)
Andy Grover7875e182009-02-24 15:30:26 +0000311{
312 struct rds_message *rm;
Andy Grover7875e182009-02-24 15:30:26 +0000313 struct scatterlist *sg;
314 unsigned long to_copy;
Andy Grover7875e182009-02-24 15:30:26 +0000315 unsigned long vec_off;
316 int copied;
317 int ret;
318 u32 len;
319
320 rm = container_of(inc, struct rds_message, m_inc);
321 len = be32_to_cpu(rm->m_inc.i_hdr.h_len);
322
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800323 sg = rm->data.op_sg;
Andy Grover7875e182009-02-24 15:30:26 +0000324 vec_off = 0;
325 copied = 0;
326
Al Viroc310e722014-11-20 09:21:14 -0500327 while (iov_iter_count(to) && copied < len) {
Geert Uytterhoeven6ff4a8a2014-12-15 13:21:42 +0100328 to_copy = min_t(unsigned long, iov_iter_count(to),
329 sg->length - vec_off);
Andy Grover7875e182009-02-24 15:30:26 +0000330 to_copy = min_t(unsigned long, to_copy, len - copied);
331
Al Viroc310e722014-11-20 09:21:14 -0500332 rds_stats_add(s_copy_to_user, to_copy);
333 ret = copy_page_to_iter(sg_page(sg), sg->offset + vec_off,
334 to_copy, to);
335 if (ret != to_copy)
336 return -EFAULT;
Andy Grover7875e182009-02-24 15:30:26 +0000337
Andy Grover7875e182009-02-24 15:30:26 +0000338 vec_off += to_copy;
339 copied += to_copy;
340
341 if (vec_off == sg->length) {
342 vec_off = 0;
343 sg++;
344 }
345 }
346
347 return copied;
348}
349
350/*
351 * If the message is still on the send queue, wait until the transport
352 * is done with it. This is particularly important for RDMA operations.
353 */
354void rds_message_wait(struct rds_message *rm)
355{
Chris Masonc83188d2010-04-21 13:09:28 -0700356 wait_event_interruptible(rm->m_flush_wait,
Andy Grover7875e182009-02-24 15:30:26 +0000357 !test_bit(RDS_MSG_MAPPED, &rm->m_flags));
358}
359
360void rds_message_unmapped(struct rds_message *rm)
361{
362 clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
Chris Masonc83188d2010-04-21 13:09:28 -0700363 wake_up_interruptible(&rm->m_flush_wait);
Andy Grover7875e182009-02-24 15:30:26 +0000364}
Andy Grover616b7572009-08-21 12:28:32 +0000365EXPORT_SYMBOL_GPL(rds_message_unmapped);
Andy Grover7875e182009-02-24 15:30:26 +0000366