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7875e18e AG |
1 | /* |
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> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
7875e18e AG |
35 | |
36 | #include "rds.h" | |
7875e18e | 37 | |
7875e18e AG |
38 | static 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 | ||
46 | void 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 | } | |
616b757a | 51 | EXPORT_SYMBOL_GPL(rds_message_addref); |
7875e18e AG |
52 | |
53 | /* | |
54 | * This relies on dma_map_sg() not touching sg[].page during merging. | |
55 | */ | |
56 | static 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 | ||
6c7cc6e4 AG |
63 | for (i = 0; i < rm->data.op_nents; i++) { |
64 | rdsdebug("putting data page %p\n", (void *)sg_page(&rm->data.op_sg[i])); | |
7875e18e | 65 | /* XXX will have to put_page for page refs */ |
6c7cc6e4 | 66 | __free_page(sg_page(&rm->data.op_sg[i])); |
7875e18e | 67 | } |
6c7cc6e4 | 68 | rm->data.op_nents = 0; |
7875e18e | 69 | |
f8b3aaf2 AG |
70 | 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); | |
d0ab25a8 AG |
74 | |
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); | |
7875e18e | 79 | } |
7875e18e AG |
80 | |
81 | void rds_message_put(struct rds_message *rm) | |
82 | { | |
83 | rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount)); | |
7e3f2952 CM |
84 | if (atomic_read(&rm->m_refcount) == 0) { |
85 | printk(KERN_CRIT "danger refcount zero on %p\n", rm); | |
86 | WARN_ON(1); | |
87 | } | |
7875e18e AG |
88 | 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 | } | |
616b757a | 96 | EXPORT_SYMBOL_GPL(rds_message_put); |
7875e18e | 97 | |
7875e18e AG |
98 | void 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 | } | |
616b757a | 107 | EXPORT_SYMBOL_GPL(rds_message_populate_header); |
7875e18e | 108 | |
ff51bf84 | 109 | int rds_message_add_extension(struct rds_header *hdr, unsigned int type, |
110 | const void *data, unsigned int len) | |
7875e18e AG |
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 | ||
f64f9e71 | 119 | if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type]) |
7875e18e AG |
120 | 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 | } | |
616b757a | 132 | EXPORT_SYMBOL_GPL(rds_message_add_extension); |
7875e18e AG |
133 | |
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 | */ | |
148 | int 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 | ||
174 | none: | |
175 | *pos = RDS_HEADER_EXT_SPACE; | |
176 | *buflen = 0; | |
177 | return RDS_EXTHDR_NONE; | |
178 | } | |
179 | ||
7875e18e AG |
180 | int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset) |
181 | { | |
182 | struct rds_ext_header_rdma_dest ext_hdr; | |
183 | ||
184 | ext_hdr.h_rdma_rkey = cpu_to_be32(r_key); | |
185 | ext_hdr.h_rdma_offset = cpu_to_be32(offset); | |
186 | return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr)); | |
187 | } | |
616b757a | 188 | EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension); |
7875e18e | 189 | |
fc445084 AG |
190 | /* |
191 | * Each rds_message is allocated with extra space for the scatterlist entries | |
192 | * rds ops will need. This is to minimize memory allocation count. Then, each rds op | |
193 | * can grab SGs when initializing its part of the rds_message. | |
194 | */ | |
195 | struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp) | |
7875e18e AG |
196 | { |
197 | struct rds_message *rm; | |
198 | ||
fc445084 | 199 | rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp); |
7875e18e AG |
200 | if (!rm) |
201 | goto out; | |
202 | ||
fc445084 AG |
203 | rm->m_used_sgs = 0; |
204 | rm->m_total_sgs = extra_len / sizeof(struct scatterlist); | |
205 | ||
7875e18e AG |
206 | atomic_set(&rm->m_refcount, 1); |
207 | INIT_LIST_HEAD(&rm->m_sock_item); | |
208 | INIT_LIST_HEAD(&rm->m_conn_item); | |
209 | spin_lock_init(&rm->m_rs_lock); | |
c83188dc | 210 | init_waitqueue_head(&rm->m_flush_wait); |
7875e18e AG |
211 | |
212 | out: | |
213 | return rm; | |
214 | } | |
215 | ||
fc445084 AG |
216 | /* |
217 | * RDS ops use this to grab SG entries from the rm's sg pool. | |
218 | */ | |
219 | struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents) | |
220 | { | |
221 | struct scatterlist *sg_first = (struct scatterlist *) &rm[1]; | |
222 | struct scatterlist *sg_ret; | |
223 | ||
224 | WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs); | |
ee4c7b47 | 225 | WARN_ON(!nents); |
fc445084 | 226 | |
d139ff09 AG |
227 | if (rm->m_used_sgs + nents > rm->m_total_sgs) |
228 | return NULL; | |
229 | ||
fc445084 | 230 | sg_ret = &sg_first[rm->m_used_sgs]; |
f4dd96f7 | 231 | sg_init_table(sg_ret, nents); |
fc445084 AG |
232 | rm->m_used_sgs += nents; |
233 | ||
234 | return sg_ret; | |
235 | } | |
236 | ||
7875e18e AG |
237 | struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len) |
238 | { | |
239 | struct rds_message *rm; | |
240 | unsigned int i; | |
ff87e97a AG |
241 | int num_sgs = ceil(total_len, PAGE_SIZE); |
242 | int extra_bytes = num_sgs * sizeof(struct scatterlist); | |
7875e18e | 243 | |
f2ec76f2 | 244 | rm = rds_message_alloc(extra_bytes, GFP_NOWAIT); |
8690bfa1 | 245 | if (!rm) |
7875e18e AG |
246 | return ERR_PTR(-ENOMEM); |
247 | ||
248 | set_bit(RDS_MSG_PAGEVEC, &rm->m_flags); | |
249 | rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len); | |
6c7cc6e4 AG |
250 | rm->data.op_nents = ceil(total_len, PAGE_SIZE); |
251 | rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs); | |
aa58163a PE |
252 | if (!rm->data.op_sg) { |
253 | rds_message_put(rm); | |
d139ff09 | 254 | return ERR_PTR(-ENOMEM); |
aa58163a | 255 | } |
7875e18e | 256 | |
6c7cc6e4 AG |
257 | for (i = 0; i < rm->data.op_nents; ++i) { |
258 | sg_set_page(&rm->data.op_sg[i], | |
7875e18e AG |
259 | virt_to_page(page_addrs[i]), |
260 | PAGE_SIZE, 0); | |
261 | } | |
262 | ||
263 | return rm; | |
264 | } | |
265 | ||
fc445084 | 266 | int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov, |
7875e18e AG |
267 | size_t total_len) |
268 | { | |
269 | unsigned long to_copy; | |
270 | unsigned long iov_off; | |
271 | unsigned long sg_off; | |
7875e18e AG |
272 | struct iovec *iov; |
273 | struct scatterlist *sg; | |
fc445084 | 274 | int ret = 0; |
7875e18e AG |
275 | |
276 | rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len); | |
277 | ||
278 | /* | |
279 | * now allocate and copy in the data payload. | |
280 | */ | |
6c7cc6e4 | 281 | sg = rm->data.op_sg; |
7875e18e AG |
282 | iov = first_iov; |
283 | iov_off = 0; | |
284 | sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */ | |
285 | ||
286 | while (total_len) { | |
8690bfa1 | 287 | if (!sg_page(sg)) { |
7875e18e AG |
288 | ret = rds_page_remainder_alloc(sg, total_len, |
289 | GFP_HIGHUSER); | |
290 | if (ret) | |
291 | goto out; | |
6c7cc6e4 | 292 | rm->data.op_nents++; |
7875e18e AG |
293 | sg_off = 0; |
294 | } | |
295 | ||
296 | while (iov_off == iov->iov_len) { | |
297 | iov_off = 0; | |
298 | iov++; | |
299 | } | |
300 | ||
301 | to_copy = min(iov->iov_len - iov_off, sg->length - sg_off); | |
302 | to_copy = min_t(size_t, to_copy, total_len); | |
303 | ||
304 | rdsdebug("copying %lu bytes from user iov [%p, %zu] + %lu to " | |
305 | "sg [%p, %u, %u] + %lu\n", | |
306 | to_copy, iov->iov_base, iov->iov_len, iov_off, | |
307 | (void *)sg_page(sg), sg->offset, sg->length, sg_off); | |
308 | ||
309 | ret = rds_page_copy_from_user(sg_page(sg), sg->offset + sg_off, | |
310 | iov->iov_base + iov_off, | |
311 | to_copy); | |
312 | if (ret) | |
313 | goto out; | |
314 | ||
315 | iov_off += to_copy; | |
316 | total_len -= to_copy; | |
317 | sg_off += to_copy; | |
318 | ||
319 | if (sg_off == sg->length) | |
320 | sg++; | |
321 | } | |
322 | ||
7875e18e | 323 | out: |
fc445084 | 324 | return ret; |
7875e18e AG |
325 | } |
326 | ||
327 | int rds_message_inc_copy_to_user(struct rds_incoming *inc, | |
328 | struct iovec *first_iov, size_t size) | |
329 | { | |
330 | struct rds_message *rm; | |
331 | struct iovec *iov; | |
332 | struct scatterlist *sg; | |
333 | unsigned long to_copy; | |
334 | unsigned long iov_off; | |
335 | unsigned long vec_off; | |
336 | int copied; | |
337 | int ret; | |
338 | u32 len; | |
339 | ||
340 | rm = container_of(inc, struct rds_message, m_inc); | |
341 | len = be32_to_cpu(rm->m_inc.i_hdr.h_len); | |
342 | ||
343 | iov = first_iov; | |
344 | iov_off = 0; | |
6c7cc6e4 | 345 | sg = rm->data.op_sg; |
7875e18e AG |
346 | vec_off = 0; |
347 | copied = 0; | |
348 | ||
349 | while (copied < size && copied < len) { | |
350 | while (iov_off == iov->iov_len) { | |
351 | iov_off = 0; | |
352 | iov++; | |
353 | } | |
354 | ||
355 | to_copy = min(iov->iov_len - iov_off, sg->length - vec_off); | |
356 | to_copy = min_t(size_t, to_copy, size - copied); | |
357 | to_copy = min_t(unsigned long, to_copy, len - copied); | |
358 | ||
359 | rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to " | |
360 | "sg [%p, %u, %u] + %lu\n", | |
361 | to_copy, iov->iov_base, iov->iov_len, iov_off, | |
362 | sg_page(sg), sg->offset, sg->length, vec_off); | |
363 | ||
364 | ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off, | |
365 | iov->iov_base + iov_off, | |
366 | to_copy); | |
367 | if (ret) { | |
368 | copied = ret; | |
369 | break; | |
370 | } | |
371 | ||
372 | iov_off += to_copy; | |
373 | vec_off += to_copy; | |
374 | copied += to_copy; | |
375 | ||
376 | if (vec_off == sg->length) { | |
377 | vec_off = 0; | |
378 | sg++; | |
379 | } | |
380 | } | |
381 | ||
382 | return copied; | |
383 | } | |
384 | ||
385 | /* | |
386 | * If the message is still on the send queue, wait until the transport | |
387 | * is done with it. This is particularly important for RDMA operations. | |
388 | */ | |
389 | void rds_message_wait(struct rds_message *rm) | |
390 | { | |
c83188dc | 391 | wait_event_interruptible(rm->m_flush_wait, |
7875e18e AG |
392 | !test_bit(RDS_MSG_MAPPED, &rm->m_flags)); |
393 | } | |
394 | ||
395 | void rds_message_unmapped(struct rds_message *rm) | |
396 | { | |
397 | clear_bit(RDS_MSG_MAPPED, &rm->m_flags); | |
c83188dc | 398 | wake_up_interruptible(&rm->m_flush_wait); |
7875e18e | 399 | } |
616b757a | 400 | EXPORT_SYMBOL_GPL(rds_message_unmapped); |
7875e18e | 401 |