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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> |
34 | #include <linux/slab.h> |
35 | |
36 | #include "rds.h" |
37 | |
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 | } |
51 | EXPORT_SYMBOL_GPL(rds_message_addref); |
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 | |
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])); |
65 | /* XXX will have to put_page for page refs */ |
66 | __free_page(sg_page(&rm->data.op_sg[i])); |
67 | } |
68 | rm->data.op_nents = 0; |
69 | |
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); |
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); |
79 | } |
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)); |
84 | if (atomic_read(&rm->m_refcount) == 0) { |
85 | printk(KERN_CRIT "danger refcount zero on %p\n", rm); |
86 | WARN_ON(1); |
87 | } |
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 | } |
96 | EXPORT_SYMBOL_GPL(rds_message_put); |
97 | |
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 | } |
107 | EXPORT_SYMBOL_GPL(rds_message_populate_header); |
108 | |
109 | int rds_message_add_extension(struct rds_header *hdr, unsigned int type, |
110 | 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 | |
119 | if (type >= __RDS_EXTHDR_MAX || len != rds_exthdr_size[type]) |
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 | } |
132 | EXPORT_SYMBOL_GPL(rds_message_add_extension); |
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 | |
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 | } |
188 | EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension); |
189 | |
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) |
196 | { |
197 | struct rds_message *rm; |
198 | |
199 | rm = kzalloc(sizeof(struct rds_message) + extra_len, gfp); |
200 | if (!rm) |
201 | goto out; |
202 | |
203 | rm->m_used_sgs = 0; |
204 | rm->m_total_sgs = extra_len / sizeof(struct scatterlist); |
205 | |
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); |
210 | init_waitqueue_head(&rm->m_flush_wait); |
211 | |
212 | out: |
213 | return rm; |
214 | } |
215 | |
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); |
225 | WARN_ON(!nents); |
226 | |
227 | if (rm->m_used_sgs + nents > rm->m_total_sgs) |
228 | return NULL; |
229 | |
230 | sg_ret = &sg_first[rm->m_used_sgs]; |
231 | sg_init_table(sg_ret, nents); |
232 | rm->m_used_sgs += nents; |
233 | |
234 | return sg_ret; |
235 | } |
236 | |
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; |
241 | int num_sgs = ceil(total_len, PAGE_SIZE); |
242 | int extra_bytes = num_sgs * sizeof(struct scatterlist); |
243 | |
244 | rm = rds_message_alloc(extra_bytes, GFP_NOWAIT); |
245 | if (!rm) |
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); |
250 | rm->data.op_nents = ceil(total_len, PAGE_SIZE); |
251 | rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs); |
252 | if (!rm->data.op_sg) { |
253 | rds_message_put(rm); |
254 | return ERR_PTR(-ENOMEM); |
255 | } |
256 | |
257 | for (i = 0; i < rm->data.op_nents; ++i) { |
258 | sg_set_page(&rm->data.op_sg[i], |
259 | virt_to_page(page_addrs[i]), |
260 | PAGE_SIZE, 0); |
261 | } |
262 | |
263 | return rm; |
264 | } |
265 | |
266 | int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov, |
267 | size_t total_len) |
268 | { |
269 | unsigned long to_copy; |
270 | unsigned long iov_off; |
271 | unsigned long sg_off; |
272 | struct iovec *iov; |
273 | struct scatterlist *sg; |
274 | int ret = 0; |
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 | */ |
281 | sg = rm->data.op_sg; |
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) { |
287 | if (!sg_page(sg)) { |
288 | ret = rds_page_remainder_alloc(sg, total_len, |
289 | GFP_HIGHUSER); |
290 | if (ret) |
291 | goto out; |
292 | rm->data.op_nents++; |
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 | |
323 | out: |
324 | return ret; |
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; |
345 | sg = rm->data.op_sg; |
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 | { |
391 | wait_event_interruptible(rm->m_flush_wait, |
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); |
398 | wake_up_interruptible(&rm->m_flush_wait); |
399 | } |
400 | EXPORT_SYMBOL_GPL(rds_message_unmapped); |
401 | |
402 |
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