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 35 #include "rds.h" 36 #include "rdma.h" 37 38 static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq); 39 40 static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = { 41 [RDS_EXTHDR_NONE] = 0, 42 [RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version), 43 [RDS_EXTHDR_RDMA] = sizeof(struct rds_ext_header_rdma), 44 [RDS_EXTHDR_RDMA_DEST] = sizeof(struct rds_ext_header_rdma_dest), 45 }; 46 47 48 void rds_message_addref(struct rds_message *rm) 49 { 50 rdsdebug("addref rm %p ref %d\n", rm, atomic_read(&rm->m_refcount)); 51 atomic_inc(&rm->m_refcount); 52 } 53 EXPORT_SYMBOL_GPL(rds_message_addref); 54 55 /* 56 * This relies on dma_map_sg() not touching sg[].page during merging. 57 */ 58 static void rds_message_purge(struct rds_message *rm) 59 { 60 unsigned long i; 61 62 if (unlikely(test_bit(RDS_MSG_PAGEVEC, &rm->m_flags))) 63 return; 64 65 for (i = 0; i < rm->m_nents; i++) { 66 rdsdebug("putting data page %p\n", (void *)sg_page(&rm->m_sg[i])); 67 /* XXX will have to put_page for page refs */ 68 __free_page(sg_page(&rm->m_sg[i])); 69 } 70 rm->m_nents = 0; 71 72 if (rm->m_rdma_op) 73 rds_rdma_free_op(rm->m_rdma_op); 74 if (rm->m_rdma_mr) 75 rds_mr_put(rm->m_rdma_mr); 76 } 77 78 void rds_message_inc_purge(struct rds_incoming *inc) 79 { 80 struct rds_message *rm = container_of(inc, struct rds_message, m_inc); 81 rds_message_purge(rm); 82 } 83 84 void rds_message_put(struct rds_message *rm) 85 { 86 rdsdebug("put rm %p ref %d\n", rm, atomic_read(&rm->m_refcount)); 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_inc_free(struct rds_incoming *inc) 99 { 100 struct rds_message *rm = container_of(inc, struct rds_message, m_inc); 101 rds_message_put(rm); 102 } 103 104 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 105 __be16 dport, u64 seq) 106 { 107 hdr->h_flags = 0; 108 hdr->h_sport = sport; 109 hdr->h_dport = dport; 110 hdr->h_sequence = cpu_to_be64(seq); 111 hdr->h_exthdr[0] = RDS_EXTHDR_NONE; 112 } 113 EXPORT_SYMBOL_GPL(rds_message_populate_header); 114 115 int rds_message_add_extension(struct rds_header *hdr, 116 unsigned int type, const void *data, unsigned int len) 117 { 118 unsigned int ext_len = sizeof(u8) + len; 119 unsigned char *dst; 120 121 /* For now, refuse to add more than one extension header */ 122 if (hdr->h_exthdr[0] != RDS_EXTHDR_NONE) 123 return 0; 124 125 if (type >= __RDS_EXTHDR_MAX 126 || len != rds_exthdr_size[type]) 127 return 0; 128 129 if (ext_len >= RDS_HEADER_EXT_SPACE) 130 return 0; 131 dst = hdr->h_exthdr; 132 133 *dst++ = type; 134 memcpy(dst, data, len); 135 136 dst[len] = RDS_EXTHDR_NONE; 137 return 1; 138 } 139 EXPORT_SYMBOL_GPL(rds_message_add_extension); 140 141 /* 142 * If a message has extension headers, retrieve them here. 143 * Call like this: 144 * 145 * unsigned int pos = 0; 146 * 147 * while (1) { 148 * buflen = sizeof(buffer); 149 * type = rds_message_next_extension(hdr, &pos, buffer, &buflen); 150 * if (type == RDS_EXTHDR_NONE) 151 * break; 152 * ... 153 * } 154 */ 155 int rds_message_next_extension(struct rds_header *hdr, 156 unsigned int *pos, void *buf, unsigned int *buflen) 157 { 158 unsigned int offset, ext_type, ext_len; 159 u8 *src = hdr->h_exthdr; 160 161 offset = *pos; 162 if (offset >= RDS_HEADER_EXT_SPACE) 163 goto none; 164 165 /* Get the extension type and length. For now, the 166 * length is implied by the extension type. */ 167 ext_type = src[offset++]; 168 169 if (ext_type == RDS_EXTHDR_NONE || ext_type >= __RDS_EXTHDR_MAX) 170 goto none; 171 ext_len = rds_exthdr_size[ext_type]; 172 if (offset + ext_len > RDS_HEADER_EXT_SPACE) 173 goto none; 174 175 *pos = offset + ext_len; 176 if (ext_len < *buflen) 177 *buflen = ext_len; 178 memcpy(buf, src + offset, *buflen); 179 return ext_type; 180 181 none: 182 *pos = RDS_HEADER_EXT_SPACE; 183 *buflen = 0; 184 return RDS_EXTHDR_NONE; 185 } 186 187 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version) 188 { 189 struct rds_ext_header_version ext_hdr; 190 191 ext_hdr.h_version = cpu_to_be32(version); 192 return rds_message_add_extension(hdr, RDS_EXTHDR_VERSION, &ext_hdr, sizeof(ext_hdr)); 193 } 194 195 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version) 196 { 197 struct rds_ext_header_version ext_hdr; 198 unsigned int pos = 0, len = sizeof(ext_hdr); 199 200 /* We assume the version extension is the only one present */ 201 if (rds_message_next_extension(hdr, &pos, &ext_hdr, &len) != RDS_EXTHDR_VERSION) 202 return 0; 203 *version = be32_to_cpu(ext_hdr.h_version); 204 return 1; 205 } 206 207 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset) 208 { 209 struct rds_ext_header_rdma_dest ext_hdr; 210 211 ext_hdr.h_rdma_rkey = cpu_to_be32(r_key); 212 ext_hdr.h_rdma_offset = cpu_to_be32(offset); 213 return rds_message_add_extension(hdr, RDS_EXTHDR_RDMA_DEST, &ext_hdr, sizeof(ext_hdr)); 214 } 215 EXPORT_SYMBOL_GPL(rds_message_add_rdma_dest_extension); 216 217 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp) 218 { 219 struct rds_message *rm; 220 221 rm = kzalloc(sizeof(struct rds_message) + 222 (nents * sizeof(struct scatterlist)), gfp); 223 if (!rm) 224 goto out; 225 226 if (nents) 227 sg_init_table(rm->m_sg, nents); 228 atomic_set(&rm->m_refcount, 1); 229 INIT_LIST_HEAD(&rm->m_sock_item); 230 INIT_LIST_HEAD(&rm->m_conn_item); 231 spin_lock_init(&rm->m_rs_lock); 232 233 out: 234 return rm; 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; 241 242 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL); 243 if (rm == NULL) 244 return ERR_PTR(-ENOMEM); 245 246 set_bit(RDS_MSG_PAGEVEC, &rm->m_flags); 247 rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len); 248 rm->m_nents = ceil(total_len, PAGE_SIZE); 249 250 for (i = 0; i < rm->m_nents; ++i) { 251 sg_set_page(&rm->m_sg[i], 252 virt_to_page(page_addrs[i]), 253 PAGE_SIZE, 0); 254 } 255 256 return rm; 257 } 258 259 struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, 260 size_t total_len) 261 { 262 unsigned long to_copy; 263 unsigned long iov_off; 264 unsigned long sg_off; 265 struct rds_message *rm; 266 struct iovec *iov; 267 struct scatterlist *sg; 268 int ret; 269 270 rm = rds_message_alloc(ceil(total_len, PAGE_SIZE), GFP_KERNEL); 271 if (rm == NULL) { 272 ret = -ENOMEM; 273 goto out; 274 } 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->m_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) == NULL) { 288 ret = rds_page_remainder_alloc(sg, total_len, 289 GFP_HIGHUSER); 290 if (ret) 291 goto out; 292 rm->m_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 ret = 0; 324 out: 325 if (ret) { 326 if (rm) 327 rds_message_put(rm); 328 rm = ERR_PTR(ret); 329 } 330 return rm; 331 } 332 333 int rds_message_inc_copy_to_user(struct rds_incoming *inc, 334 struct iovec *first_iov, size_t size) 335 { 336 struct rds_message *rm; 337 struct iovec *iov; 338 struct scatterlist *sg; 339 unsigned long to_copy; 340 unsigned long iov_off; 341 unsigned long vec_off; 342 int copied; 343 int ret; 344 u32 len; 345 346 rm = container_of(inc, struct rds_message, m_inc); 347 len = be32_to_cpu(rm->m_inc.i_hdr.h_len); 348 349 iov = first_iov; 350 iov_off = 0; 351 sg = rm->m_sg; 352 vec_off = 0; 353 copied = 0; 354 355 while (copied < size && copied < len) { 356 while (iov_off == iov->iov_len) { 357 iov_off = 0; 358 iov++; 359 } 360 361 to_copy = min(iov->iov_len - iov_off, sg->length - vec_off); 362 to_copy = min_t(size_t, to_copy, size - copied); 363 to_copy = min_t(unsigned long, to_copy, len - copied); 364 365 rdsdebug("copying %lu bytes to user iov [%p, %zu] + %lu to " 366 "sg [%p, %u, %u] + %lu\n", 367 to_copy, iov->iov_base, iov->iov_len, iov_off, 368 sg_page(sg), sg->offset, sg->length, vec_off); 369 370 ret = rds_page_copy_to_user(sg_page(sg), sg->offset + vec_off, 371 iov->iov_base + iov_off, 372 to_copy); 373 if (ret) { 374 copied = ret; 375 break; 376 } 377 378 iov_off += to_copy; 379 vec_off += to_copy; 380 copied += to_copy; 381 382 if (vec_off == sg->length) { 383 vec_off = 0; 384 sg++; 385 } 386 } 387 388 return copied; 389 } 390 391 /* 392 * If the message is still on the send queue, wait until the transport 393 * is done with it. This is particularly important for RDMA operations. 394 */ 395 void rds_message_wait(struct rds_message *rm) 396 { 397 wait_event(rds_message_flush_waitq, 398 !test_bit(RDS_MSG_MAPPED, &rm->m_flags)); 399 } 400 401 void rds_message_unmapped(struct rds_message *rm) 402 { 403 clear_bit(RDS_MSG_MAPPED, &rm->m_flags); 404 if (waitqueue_active(&rds_message_flush_waitq)) 405 wake_up(&rds_message_flush_waitq); 406 } 407 EXPORT_SYMBOL_GPL(rds_message_unmapped); 408 409