Sean Hefty | e51060f | 2006-06-17 20:37:29 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2005 Voltaire Inc. All rights reserved. |
| 3 | * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved. |
| 4 | * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved. |
| 5 | * Copyright (c) 2005-2006 Intel Corporation. All rights reserved. |
| 6 | * |
| 7 | * This Software is licensed under one of the following licenses: |
| 8 | * |
| 9 | * 1) under the terms of the "Common Public License 1.0" a copy of which is |
| 10 | * available from the Open Source Initiative, see |
| 11 | * http://www.opensource.org/licenses/cpl.php. |
| 12 | * |
| 13 | * 2) under the terms of the "The BSD License" a copy of which is |
| 14 | * available from the Open Source Initiative, see |
| 15 | * http://www.opensource.org/licenses/bsd-license.php. |
| 16 | * |
| 17 | * 3) under the terms of the "GNU General Public License (GPL) Version 2" a |
| 18 | * copy of which is available from the Open Source Initiative, see |
| 19 | * http://www.opensource.org/licenses/gpl-license.php. |
| 20 | * |
| 21 | * Licensee has the right to choose one of the above licenses. |
| 22 | * |
| 23 | * Redistributions of source code must retain the above copyright |
| 24 | * notice and one of the license notices. |
| 25 | * |
| 26 | * Redistributions in binary form must reproduce both the above copyright |
| 27 | * notice, one of the license notices in the documentation |
| 28 | * and/or other materials provided with the distribution. |
| 29 | * |
| 30 | */ |
| 31 | |
| 32 | #include <linux/completion.h> |
| 33 | #include <linux/in.h> |
| 34 | #include <linux/in6.h> |
| 35 | #include <linux/mutex.h> |
| 36 | #include <linux/random.h> |
| 37 | #include <linux/idr.h> |
| 38 | |
| 39 | #include <net/tcp.h> |
| 40 | |
| 41 | #include <rdma/rdma_cm.h> |
| 42 | #include <rdma/rdma_cm_ib.h> |
| 43 | #include <rdma/ib_cache.h> |
| 44 | #include <rdma/ib_cm.h> |
| 45 | #include <rdma/ib_sa.h> |
| 46 | |
| 47 | MODULE_AUTHOR("Sean Hefty"); |
| 48 | MODULE_DESCRIPTION("Generic RDMA CM Agent"); |
| 49 | MODULE_LICENSE("Dual BSD/GPL"); |
| 50 | |
| 51 | #define CMA_CM_RESPONSE_TIMEOUT 20 |
| 52 | #define CMA_MAX_CM_RETRIES 3 |
| 53 | |
| 54 | static void cma_add_one(struct ib_device *device); |
| 55 | static void cma_remove_one(struct ib_device *device); |
| 56 | |
| 57 | static struct ib_client cma_client = { |
| 58 | .name = "cma", |
| 59 | .add = cma_add_one, |
| 60 | .remove = cma_remove_one |
| 61 | }; |
| 62 | |
| 63 | static LIST_HEAD(dev_list); |
| 64 | static LIST_HEAD(listen_any_list); |
| 65 | static DEFINE_MUTEX(lock); |
| 66 | static struct workqueue_struct *cma_wq; |
| 67 | static DEFINE_IDR(sdp_ps); |
| 68 | static DEFINE_IDR(tcp_ps); |
| 69 | |
| 70 | struct cma_device { |
| 71 | struct list_head list; |
| 72 | struct ib_device *device; |
| 73 | __be64 node_guid; |
| 74 | struct completion comp; |
| 75 | atomic_t refcount; |
| 76 | struct list_head id_list; |
| 77 | }; |
| 78 | |
| 79 | enum cma_state { |
| 80 | CMA_IDLE, |
| 81 | CMA_ADDR_QUERY, |
| 82 | CMA_ADDR_RESOLVED, |
| 83 | CMA_ROUTE_QUERY, |
| 84 | CMA_ROUTE_RESOLVED, |
| 85 | CMA_CONNECT, |
| 86 | CMA_DISCONNECT, |
| 87 | CMA_ADDR_BOUND, |
| 88 | CMA_LISTEN, |
| 89 | CMA_DEVICE_REMOVAL, |
| 90 | CMA_DESTROYING |
| 91 | }; |
| 92 | |
| 93 | struct rdma_bind_list { |
| 94 | struct idr *ps; |
| 95 | struct hlist_head owners; |
| 96 | unsigned short port; |
| 97 | }; |
| 98 | |
| 99 | /* |
| 100 | * Device removal can occur at anytime, so we need extra handling to |
| 101 | * serialize notifying the user of device removal with other callbacks. |
| 102 | * We do this by disabling removal notification while a callback is in process, |
| 103 | * and reporting it after the callback completes. |
| 104 | */ |
| 105 | struct rdma_id_private { |
| 106 | struct rdma_cm_id id; |
| 107 | |
| 108 | struct rdma_bind_list *bind_list; |
| 109 | struct hlist_node node; |
| 110 | struct list_head list; |
| 111 | struct list_head listen_list; |
| 112 | struct cma_device *cma_dev; |
| 113 | |
| 114 | enum cma_state state; |
| 115 | spinlock_t lock; |
| 116 | struct completion comp; |
| 117 | atomic_t refcount; |
| 118 | wait_queue_head_t wait_remove; |
| 119 | atomic_t dev_remove; |
| 120 | |
| 121 | int backlog; |
| 122 | int timeout_ms; |
| 123 | struct ib_sa_query *query; |
| 124 | int query_id; |
| 125 | union { |
| 126 | struct ib_cm_id *ib; |
| 127 | } cm_id; |
| 128 | |
| 129 | u32 seq_num; |
| 130 | u32 qp_num; |
| 131 | enum ib_qp_type qp_type; |
| 132 | u8 srq; |
| 133 | }; |
| 134 | |
| 135 | struct cma_work { |
| 136 | struct work_struct work; |
| 137 | struct rdma_id_private *id; |
| 138 | enum cma_state old_state; |
| 139 | enum cma_state new_state; |
| 140 | struct rdma_cm_event event; |
| 141 | }; |
| 142 | |
| 143 | union cma_ip_addr { |
| 144 | struct in6_addr ip6; |
| 145 | struct { |
| 146 | __u32 pad[3]; |
| 147 | __u32 addr; |
| 148 | } ip4; |
| 149 | }; |
| 150 | |
| 151 | struct cma_hdr { |
| 152 | u8 cma_version; |
| 153 | u8 ip_version; /* IP version: 7:4 */ |
| 154 | __u16 port; |
| 155 | union cma_ip_addr src_addr; |
| 156 | union cma_ip_addr dst_addr; |
| 157 | }; |
| 158 | |
| 159 | struct sdp_hh { |
| 160 | u8 bsdh[16]; |
| 161 | u8 sdp_version; /* Major version: 7:4 */ |
| 162 | u8 ip_version; /* IP version: 7:4 */ |
| 163 | u8 sdp_specific1[10]; |
| 164 | __u16 port; |
| 165 | __u16 sdp_specific2; |
| 166 | union cma_ip_addr src_addr; |
| 167 | union cma_ip_addr dst_addr; |
| 168 | }; |
| 169 | |
| 170 | struct sdp_hah { |
| 171 | u8 bsdh[16]; |
| 172 | u8 sdp_version; |
| 173 | }; |
| 174 | |
| 175 | #define CMA_VERSION 0x00 |
| 176 | #define SDP_MAJ_VERSION 0x2 |
| 177 | |
| 178 | static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp) |
| 179 | { |
| 180 | unsigned long flags; |
| 181 | int ret; |
| 182 | |
| 183 | spin_lock_irqsave(&id_priv->lock, flags); |
| 184 | ret = (id_priv->state == comp); |
| 185 | spin_unlock_irqrestore(&id_priv->lock, flags); |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | static int cma_comp_exch(struct rdma_id_private *id_priv, |
| 190 | enum cma_state comp, enum cma_state exch) |
| 191 | { |
| 192 | unsigned long flags; |
| 193 | int ret; |
| 194 | |
| 195 | spin_lock_irqsave(&id_priv->lock, flags); |
| 196 | if ((ret = (id_priv->state == comp))) |
| 197 | id_priv->state = exch; |
| 198 | spin_unlock_irqrestore(&id_priv->lock, flags); |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | static enum cma_state cma_exch(struct rdma_id_private *id_priv, |
| 203 | enum cma_state exch) |
| 204 | { |
| 205 | unsigned long flags; |
| 206 | enum cma_state old; |
| 207 | |
| 208 | spin_lock_irqsave(&id_priv->lock, flags); |
| 209 | old = id_priv->state; |
| 210 | id_priv->state = exch; |
| 211 | spin_unlock_irqrestore(&id_priv->lock, flags); |
| 212 | return old; |
| 213 | } |
| 214 | |
| 215 | static inline u8 cma_get_ip_ver(struct cma_hdr *hdr) |
| 216 | { |
| 217 | return hdr->ip_version >> 4; |
| 218 | } |
| 219 | |
| 220 | static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver) |
| 221 | { |
| 222 | hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF); |
| 223 | } |
| 224 | |
| 225 | static inline u8 sdp_get_majv(u8 sdp_version) |
| 226 | { |
| 227 | return sdp_version >> 4; |
| 228 | } |
| 229 | |
| 230 | static inline u8 sdp_get_ip_ver(struct sdp_hh *hh) |
| 231 | { |
| 232 | return hh->ip_version >> 4; |
| 233 | } |
| 234 | |
| 235 | static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver) |
| 236 | { |
| 237 | hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF); |
| 238 | } |
| 239 | |
| 240 | static void cma_attach_to_dev(struct rdma_id_private *id_priv, |
| 241 | struct cma_device *cma_dev) |
| 242 | { |
| 243 | atomic_inc(&cma_dev->refcount); |
| 244 | id_priv->cma_dev = cma_dev; |
| 245 | id_priv->id.device = cma_dev->device; |
| 246 | list_add_tail(&id_priv->list, &cma_dev->id_list); |
| 247 | } |
| 248 | |
| 249 | static inline void cma_deref_dev(struct cma_device *cma_dev) |
| 250 | { |
| 251 | if (atomic_dec_and_test(&cma_dev->refcount)) |
| 252 | complete(&cma_dev->comp); |
| 253 | } |
| 254 | |
| 255 | static void cma_detach_from_dev(struct rdma_id_private *id_priv) |
| 256 | { |
| 257 | list_del(&id_priv->list); |
| 258 | cma_deref_dev(id_priv->cma_dev); |
| 259 | id_priv->cma_dev = NULL; |
| 260 | } |
| 261 | |
| 262 | static int cma_acquire_ib_dev(struct rdma_id_private *id_priv) |
| 263 | { |
| 264 | struct cma_device *cma_dev; |
| 265 | union ib_gid *gid; |
| 266 | int ret = -ENODEV; |
| 267 | |
| 268 | gid = ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr); |
| 269 | |
| 270 | mutex_lock(&lock); |
| 271 | list_for_each_entry(cma_dev, &dev_list, list) { |
| 272 | ret = ib_find_cached_gid(cma_dev->device, gid, |
| 273 | &id_priv->id.port_num, NULL); |
| 274 | if (!ret) { |
| 275 | cma_attach_to_dev(id_priv, cma_dev); |
| 276 | break; |
| 277 | } |
| 278 | } |
| 279 | mutex_unlock(&lock); |
| 280 | return ret; |
| 281 | } |
| 282 | |
| 283 | static int cma_acquire_dev(struct rdma_id_private *id_priv) |
| 284 | { |
| 285 | switch (id_priv->id.route.addr.dev_addr.dev_type) { |
| 286 | case IB_NODE_CA: |
| 287 | return cma_acquire_ib_dev(id_priv); |
| 288 | default: |
| 289 | return -ENODEV; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | static void cma_deref_id(struct rdma_id_private *id_priv) |
| 294 | { |
| 295 | if (atomic_dec_and_test(&id_priv->refcount)) |
| 296 | complete(&id_priv->comp); |
| 297 | } |
| 298 | |
| 299 | static void cma_release_remove(struct rdma_id_private *id_priv) |
| 300 | { |
| 301 | if (atomic_dec_and_test(&id_priv->dev_remove)) |
| 302 | wake_up(&id_priv->wait_remove); |
| 303 | } |
| 304 | |
| 305 | struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler, |
| 306 | void *context, enum rdma_port_space ps) |
| 307 | { |
| 308 | struct rdma_id_private *id_priv; |
| 309 | |
| 310 | id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL); |
| 311 | if (!id_priv) |
| 312 | return ERR_PTR(-ENOMEM); |
| 313 | |
| 314 | id_priv->state = CMA_IDLE; |
| 315 | id_priv->id.context = context; |
| 316 | id_priv->id.event_handler = event_handler; |
| 317 | id_priv->id.ps = ps; |
| 318 | spin_lock_init(&id_priv->lock); |
| 319 | init_completion(&id_priv->comp); |
| 320 | atomic_set(&id_priv->refcount, 1); |
| 321 | init_waitqueue_head(&id_priv->wait_remove); |
| 322 | atomic_set(&id_priv->dev_remove, 0); |
| 323 | INIT_LIST_HEAD(&id_priv->listen_list); |
| 324 | get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num); |
| 325 | |
| 326 | return &id_priv->id; |
| 327 | } |
| 328 | EXPORT_SYMBOL(rdma_create_id); |
| 329 | |
| 330 | static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) |
| 331 | { |
| 332 | struct ib_qp_attr qp_attr; |
| 333 | struct rdma_dev_addr *dev_addr; |
| 334 | int ret; |
| 335 | |
| 336 | dev_addr = &id_priv->id.route.addr.dev_addr; |
| 337 | ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num, |
| 338 | ib_addr_get_pkey(dev_addr), |
| 339 | &qp_attr.pkey_index); |
| 340 | if (ret) |
| 341 | return ret; |
| 342 | |
| 343 | qp_attr.qp_state = IB_QPS_INIT; |
| 344 | qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; |
| 345 | qp_attr.port_num = id_priv->id.port_num; |
| 346 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS | |
| 347 | IB_QP_PKEY_INDEX | IB_QP_PORT); |
| 348 | } |
| 349 | |
| 350 | int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, |
| 351 | struct ib_qp_init_attr *qp_init_attr) |
| 352 | { |
| 353 | struct rdma_id_private *id_priv; |
| 354 | struct ib_qp *qp; |
| 355 | int ret; |
| 356 | |
| 357 | id_priv = container_of(id, struct rdma_id_private, id); |
| 358 | if (id->device != pd->device) |
| 359 | return -EINVAL; |
| 360 | |
| 361 | qp = ib_create_qp(pd, qp_init_attr); |
| 362 | if (IS_ERR(qp)) |
| 363 | return PTR_ERR(qp); |
| 364 | |
| 365 | switch (id->device->node_type) { |
| 366 | case IB_NODE_CA: |
| 367 | ret = cma_init_ib_qp(id_priv, qp); |
| 368 | break; |
| 369 | default: |
| 370 | ret = -ENOSYS; |
| 371 | break; |
| 372 | } |
| 373 | |
| 374 | if (ret) |
| 375 | goto err; |
| 376 | |
| 377 | id->qp = qp; |
| 378 | id_priv->qp_num = qp->qp_num; |
| 379 | id_priv->qp_type = qp->qp_type; |
| 380 | id_priv->srq = (qp->srq != NULL); |
| 381 | return 0; |
| 382 | err: |
| 383 | ib_destroy_qp(qp); |
| 384 | return ret; |
| 385 | } |
| 386 | EXPORT_SYMBOL(rdma_create_qp); |
| 387 | |
| 388 | void rdma_destroy_qp(struct rdma_cm_id *id) |
| 389 | { |
| 390 | ib_destroy_qp(id->qp); |
| 391 | } |
| 392 | EXPORT_SYMBOL(rdma_destroy_qp); |
| 393 | |
| 394 | static int cma_modify_qp_rtr(struct rdma_cm_id *id) |
| 395 | { |
| 396 | struct ib_qp_attr qp_attr; |
| 397 | int qp_attr_mask, ret; |
| 398 | |
| 399 | if (!id->qp) |
| 400 | return 0; |
| 401 | |
| 402 | /* Need to update QP attributes from default values. */ |
| 403 | qp_attr.qp_state = IB_QPS_INIT; |
| 404 | ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask); |
| 405 | if (ret) |
| 406 | return ret; |
| 407 | |
| 408 | ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask); |
| 409 | if (ret) |
| 410 | return ret; |
| 411 | |
| 412 | qp_attr.qp_state = IB_QPS_RTR; |
| 413 | ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask); |
| 414 | if (ret) |
| 415 | return ret; |
| 416 | |
| 417 | return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask); |
| 418 | } |
| 419 | |
| 420 | static int cma_modify_qp_rts(struct rdma_cm_id *id) |
| 421 | { |
| 422 | struct ib_qp_attr qp_attr; |
| 423 | int qp_attr_mask, ret; |
| 424 | |
| 425 | if (!id->qp) |
| 426 | return 0; |
| 427 | |
| 428 | qp_attr.qp_state = IB_QPS_RTS; |
| 429 | ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask); |
| 430 | if (ret) |
| 431 | return ret; |
| 432 | |
| 433 | return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask); |
| 434 | } |
| 435 | |
| 436 | static int cma_modify_qp_err(struct rdma_cm_id *id) |
| 437 | { |
| 438 | struct ib_qp_attr qp_attr; |
| 439 | |
| 440 | if (!id->qp) |
| 441 | return 0; |
| 442 | |
| 443 | qp_attr.qp_state = IB_QPS_ERR; |
| 444 | return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE); |
| 445 | } |
| 446 | |
| 447 | int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, |
| 448 | int *qp_attr_mask) |
| 449 | { |
| 450 | struct rdma_id_private *id_priv; |
| 451 | int ret; |
| 452 | |
| 453 | id_priv = container_of(id, struct rdma_id_private, id); |
| 454 | switch (id_priv->id.device->node_type) { |
| 455 | case IB_NODE_CA: |
| 456 | ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr, |
| 457 | qp_attr_mask); |
| 458 | if (qp_attr->qp_state == IB_QPS_RTR) |
| 459 | qp_attr->rq_psn = id_priv->seq_num; |
| 460 | break; |
| 461 | default: |
| 462 | ret = -ENOSYS; |
| 463 | break; |
| 464 | } |
| 465 | |
| 466 | return ret; |
| 467 | } |
| 468 | EXPORT_SYMBOL(rdma_init_qp_attr); |
| 469 | |
| 470 | static inline int cma_zero_addr(struct sockaddr *addr) |
| 471 | { |
| 472 | struct in6_addr *ip6; |
| 473 | |
| 474 | if (addr->sa_family == AF_INET) |
| 475 | return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr); |
| 476 | else { |
| 477 | ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr; |
| 478 | return (ip6->s6_addr32[0] | ip6->s6_addr32[1] | |
| 479 | ip6->s6_addr32[3] | ip6->s6_addr32[4]) == 0; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | static inline int cma_loopback_addr(struct sockaddr *addr) |
| 484 | { |
| 485 | return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr); |
| 486 | } |
| 487 | |
| 488 | static inline int cma_any_addr(struct sockaddr *addr) |
| 489 | { |
| 490 | return cma_zero_addr(addr) || cma_loopback_addr(addr); |
| 491 | } |
| 492 | |
| 493 | static inline int cma_any_port(struct sockaddr *addr) |
| 494 | { |
| 495 | return !((struct sockaddr_in *) addr)->sin_port; |
| 496 | } |
| 497 | |
| 498 | static int cma_get_net_info(void *hdr, enum rdma_port_space ps, |
| 499 | u8 *ip_ver, __u16 *port, |
| 500 | union cma_ip_addr **src, union cma_ip_addr **dst) |
| 501 | { |
| 502 | switch (ps) { |
| 503 | case RDMA_PS_SDP: |
| 504 | if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) != |
| 505 | SDP_MAJ_VERSION) |
| 506 | return -EINVAL; |
| 507 | |
| 508 | *ip_ver = sdp_get_ip_ver(hdr); |
| 509 | *port = ((struct sdp_hh *) hdr)->port; |
| 510 | *src = &((struct sdp_hh *) hdr)->src_addr; |
| 511 | *dst = &((struct sdp_hh *) hdr)->dst_addr; |
| 512 | break; |
| 513 | default: |
| 514 | if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION) |
| 515 | return -EINVAL; |
| 516 | |
| 517 | *ip_ver = cma_get_ip_ver(hdr); |
| 518 | *port = ((struct cma_hdr *) hdr)->port; |
| 519 | *src = &((struct cma_hdr *) hdr)->src_addr; |
| 520 | *dst = &((struct cma_hdr *) hdr)->dst_addr; |
| 521 | break; |
| 522 | } |
| 523 | |
| 524 | if (*ip_ver != 4 && *ip_ver != 6) |
| 525 | return -EINVAL; |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static void cma_save_net_info(struct rdma_addr *addr, |
| 530 | struct rdma_addr *listen_addr, |
| 531 | u8 ip_ver, __u16 port, |
| 532 | union cma_ip_addr *src, union cma_ip_addr *dst) |
| 533 | { |
| 534 | struct sockaddr_in *listen4, *ip4; |
| 535 | struct sockaddr_in6 *listen6, *ip6; |
| 536 | |
| 537 | switch (ip_ver) { |
| 538 | case 4: |
| 539 | listen4 = (struct sockaddr_in *) &listen_addr->src_addr; |
| 540 | ip4 = (struct sockaddr_in *) &addr->src_addr; |
| 541 | ip4->sin_family = listen4->sin_family; |
| 542 | ip4->sin_addr.s_addr = dst->ip4.addr; |
| 543 | ip4->sin_port = listen4->sin_port; |
| 544 | |
| 545 | ip4 = (struct sockaddr_in *) &addr->dst_addr; |
| 546 | ip4->sin_family = listen4->sin_family; |
| 547 | ip4->sin_addr.s_addr = src->ip4.addr; |
| 548 | ip4->sin_port = port; |
| 549 | break; |
| 550 | case 6: |
| 551 | listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr; |
| 552 | ip6 = (struct sockaddr_in6 *) &addr->src_addr; |
| 553 | ip6->sin6_family = listen6->sin6_family; |
| 554 | ip6->sin6_addr = dst->ip6; |
| 555 | ip6->sin6_port = listen6->sin6_port; |
| 556 | |
| 557 | ip6 = (struct sockaddr_in6 *) &addr->dst_addr; |
| 558 | ip6->sin6_family = listen6->sin6_family; |
| 559 | ip6->sin6_addr = src->ip6; |
| 560 | ip6->sin6_port = port; |
| 561 | break; |
| 562 | default: |
| 563 | break; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | static inline int cma_user_data_offset(enum rdma_port_space ps) |
| 568 | { |
| 569 | switch (ps) { |
| 570 | case RDMA_PS_SDP: |
| 571 | return 0; |
| 572 | default: |
| 573 | return sizeof(struct cma_hdr); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | static int cma_notify_user(struct rdma_id_private *id_priv, |
| 578 | enum rdma_cm_event_type type, int status, |
| 579 | void *data, u8 data_len) |
| 580 | { |
| 581 | struct rdma_cm_event event; |
| 582 | |
| 583 | event.event = type; |
| 584 | event.status = status; |
| 585 | event.private_data = data; |
| 586 | event.private_data_len = data_len; |
| 587 | |
| 588 | return id_priv->id.event_handler(&id_priv->id, &event); |
| 589 | } |
| 590 | |
| 591 | static void cma_cancel_route(struct rdma_id_private *id_priv) |
| 592 | { |
| 593 | switch (id_priv->id.device->node_type) { |
| 594 | case IB_NODE_CA: |
| 595 | if (id_priv->query) |
| 596 | ib_sa_cancel_query(id_priv->query_id, id_priv->query); |
| 597 | break; |
| 598 | default: |
| 599 | break; |
| 600 | } |
| 601 | } |
| 602 | |
| 603 | static inline int cma_internal_listen(struct rdma_id_private *id_priv) |
| 604 | { |
| 605 | return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev && |
| 606 | cma_any_addr(&id_priv->id.route.addr.src_addr); |
| 607 | } |
| 608 | |
| 609 | static void cma_destroy_listen(struct rdma_id_private *id_priv) |
| 610 | { |
| 611 | cma_exch(id_priv, CMA_DESTROYING); |
| 612 | |
| 613 | if (id_priv->cma_dev) { |
| 614 | switch (id_priv->id.device->node_type) { |
| 615 | case IB_NODE_CA: |
| 616 | if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib)) |
| 617 | ib_destroy_cm_id(id_priv->cm_id.ib); |
| 618 | break; |
| 619 | default: |
| 620 | break; |
| 621 | } |
| 622 | cma_detach_from_dev(id_priv); |
| 623 | } |
| 624 | list_del(&id_priv->listen_list); |
| 625 | |
| 626 | cma_deref_id(id_priv); |
| 627 | wait_for_completion(&id_priv->comp); |
| 628 | |
| 629 | kfree(id_priv); |
| 630 | } |
| 631 | |
| 632 | static void cma_cancel_listens(struct rdma_id_private *id_priv) |
| 633 | { |
| 634 | struct rdma_id_private *dev_id_priv; |
| 635 | |
| 636 | mutex_lock(&lock); |
| 637 | list_del(&id_priv->list); |
| 638 | |
| 639 | while (!list_empty(&id_priv->listen_list)) { |
| 640 | dev_id_priv = list_entry(id_priv->listen_list.next, |
| 641 | struct rdma_id_private, listen_list); |
| 642 | cma_destroy_listen(dev_id_priv); |
| 643 | } |
| 644 | mutex_unlock(&lock); |
| 645 | } |
| 646 | |
| 647 | static void cma_cancel_operation(struct rdma_id_private *id_priv, |
| 648 | enum cma_state state) |
| 649 | { |
| 650 | switch (state) { |
| 651 | case CMA_ADDR_QUERY: |
| 652 | rdma_addr_cancel(&id_priv->id.route.addr.dev_addr); |
| 653 | break; |
| 654 | case CMA_ROUTE_QUERY: |
| 655 | cma_cancel_route(id_priv); |
| 656 | break; |
| 657 | case CMA_LISTEN: |
| 658 | if (cma_any_addr(&id_priv->id.route.addr.src_addr) && |
| 659 | !id_priv->cma_dev) |
| 660 | cma_cancel_listens(id_priv); |
| 661 | break; |
| 662 | default: |
| 663 | break; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | static void cma_release_port(struct rdma_id_private *id_priv) |
| 668 | { |
| 669 | struct rdma_bind_list *bind_list = id_priv->bind_list; |
| 670 | |
| 671 | if (!bind_list) |
| 672 | return; |
| 673 | |
| 674 | mutex_lock(&lock); |
| 675 | hlist_del(&id_priv->node); |
| 676 | if (hlist_empty(&bind_list->owners)) { |
| 677 | idr_remove(bind_list->ps, bind_list->port); |
| 678 | kfree(bind_list); |
| 679 | } |
| 680 | mutex_unlock(&lock); |
| 681 | } |
| 682 | |
| 683 | void rdma_destroy_id(struct rdma_cm_id *id) |
| 684 | { |
| 685 | struct rdma_id_private *id_priv; |
| 686 | enum cma_state state; |
| 687 | |
| 688 | id_priv = container_of(id, struct rdma_id_private, id); |
| 689 | state = cma_exch(id_priv, CMA_DESTROYING); |
| 690 | cma_cancel_operation(id_priv, state); |
| 691 | |
| 692 | if (id_priv->cma_dev) { |
| 693 | switch (id->device->node_type) { |
| 694 | case IB_NODE_CA: |
| 695 | if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib)) |
| 696 | ib_destroy_cm_id(id_priv->cm_id.ib); |
| 697 | break; |
| 698 | default: |
| 699 | break; |
| 700 | } |
| 701 | mutex_lock(&lock); |
| 702 | cma_detach_from_dev(id_priv); |
| 703 | mutex_unlock(&lock); |
| 704 | } |
| 705 | |
| 706 | cma_release_port(id_priv); |
| 707 | cma_deref_id(id_priv); |
| 708 | wait_for_completion(&id_priv->comp); |
| 709 | |
| 710 | kfree(id_priv->id.route.path_rec); |
| 711 | kfree(id_priv); |
| 712 | } |
| 713 | EXPORT_SYMBOL(rdma_destroy_id); |
| 714 | |
| 715 | static int cma_rep_recv(struct rdma_id_private *id_priv) |
| 716 | { |
| 717 | int ret; |
| 718 | |
| 719 | ret = cma_modify_qp_rtr(&id_priv->id); |
| 720 | if (ret) |
| 721 | goto reject; |
| 722 | |
| 723 | ret = cma_modify_qp_rts(&id_priv->id); |
| 724 | if (ret) |
| 725 | goto reject; |
| 726 | |
| 727 | ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0); |
| 728 | if (ret) |
| 729 | goto reject; |
| 730 | |
| 731 | return 0; |
| 732 | reject: |
| 733 | cma_modify_qp_err(&id_priv->id); |
| 734 | ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED, |
| 735 | NULL, 0, NULL, 0); |
| 736 | return ret; |
| 737 | } |
| 738 | |
| 739 | static int cma_verify_rep(struct rdma_id_private *id_priv, void *data) |
| 740 | { |
| 741 | if (id_priv->id.ps == RDMA_PS_SDP && |
| 742 | sdp_get_majv(((struct sdp_hah *) data)->sdp_version) != |
| 743 | SDP_MAJ_VERSION) |
| 744 | return -EINVAL; |
| 745 | |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | static int cma_rtu_recv(struct rdma_id_private *id_priv) |
| 750 | { |
| 751 | int ret; |
| 752 | |
| 753 | ret = cma_modify_qp_rts(&id_priv->id); |
| 754 | if (ret) |
| 755 | goto reject; |
| 756 | |
| 757 | return 0; |
| 758 | reject: |
| 759 | cma_modify_qp_err(&id_priv->id); |
| 760 | ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED, |
| 761 | NULL, 0, NULL, 0); |
| 762 | return ret; |
| 763 | } |
| 764 | |
| 765 | static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) |
| 766 | { |
| 767 | struct rdma_id_private *id_priv = cm_id->context; |
| 768 | enum rdma_cm_event_type event; |
| 769 | u8 private_data_len = 0; |
| 770 | int ret = 0, status = 0; |
| 771 | |
| 772 | atomic_inc(&id_priv->dev_remove); |
| 773 | if (!cma_comp(id_priv, CMA_CONNECT)) |
| 774 | goto out; |
| 775 | |
| 776 | switch (ib_event->event) { |
| 777 | case IB_CM_REQ_ERROR: |
| 778 | case IB_CM_REP_ERROR: |
| 779 | event = RDMA_CM_EVENT_UNREACHABLE; |
| 780 | status = -ETIMEDOUT; |
| 781 | break; |
| 782 | case IB_CM_REP_RECEIVED: |
| 783 | status = cma_verify_rep(id_priv, ib_event->private_data); |
| 784 | if (status) |
| 785 | event = RDMA_CM_EVENT_CONNECT_ERROR; |
| 786 | else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) { |
| 787 | status = cma_rep_recv(id_priv); |
| 788 | event = status ? RDMA_CM_EVENT_CONNECT_ERROR : |
| 789 | RDMA_CM_EVENT_ESTABLISHED; |
| 790 | } else |
| 791 | event = RDMA_CM_EVENT_CONNECT_RESPONSE; |
| 792 | private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE; |
| 793 | break; |
| 794 | case IB_CM_RTU_RECEIVED: |
| 795 | status = cma_rtu_recv(id_priv); |
| 796 | event = status ? RDMA_CM_EVENT_CONNECT_ERROR : |
| 797 | RDMA_CM_EVENT_ESTABLISHED; |
| 798 | break; |
| 799 | case IB_CM_DREQ_ERROR: |
| 800 | status = -ETIMEDOUT; /* fall through */ |
| 801 | case IB_CM_DREQ_RECEIVED: |
| 802 | case IB_CM_DREP_RECEIVED: |
| 803 | if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT)) |
| 804 | goto out; |
| 805 | event = RDMA_CM_EVENT_DISCONNECTED; |
| 806 | break; |
| 807 | case IB_CM_TIMEWAIT_EXIT: |
| 808 | case IB_CM_MRA_RECEIVED: |
| 809 | /* ignore event */ |
| 810 | goto out; |
| 811 | case IB_CM_REJ_RECEIVED: |
| 812 | cma_modify_qp_err(&id_priv->id); |
| 813 | status = ib_event->param.rej_rcvd.reason; |
| 814 | event = RDMA_CM_EVENT_REJECTED; |
| 815 | break; |
| 816 | default: |
| 817 | printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d", |
| 818 | ib_event->event); |
| 819 | goto out; |
| 820 | } |
| 821 | |
| 822 | ret = cma_notify_user(id_priv, event, status, ib_event->private_data, |
| 823 | private_data_len); |
| 824 | if (ret) { |
| 825 | /* Destroy the CM ID by returning a non-zero value. */ |
| 826 | id_priv->cm_id.ib = NULL; |
| 827 | cma_exch(id_priv, CMA_DESTROYING); |
| 828 | cma_release_remove(id_priv); |
| 829 | rdma_destroy_id(&id_priv->id); |
| 830 | return ret; |
| 831 | } |
| 832 | out: |
| 833 | cma_release_remove(id_priv); |
| 834 | return ret; |
| 835 | } |
| 836 | |
| 837 | static struct rdma_id_private *cma_new_id(struct rdma_cm_id *listen_id, |
| 838 | struct ib_cm_event *ib_event) |
| 839 | { |
| 840 | struct rdma_id_private *id_priv; |
| 841 | struct rdma_cm_id *id; |
| 842 | struct rdma_route *rt; |
| 843 | union cma_ip_addr *src, *dst; |
| 844 | __u16 port; |
| 845 | u8 ip_ver; |
| 846 | |
| 847 | id = rdma_create_id(listen_id->event_handler, listen_id->context, |
| 848 | listen_id->ps); |
| 849 | if (IS_ERR(id)) |
| 850 | return NULL; |
| 851 | |
| 852 | rt = &id->route; |
| 853 | rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1; |
| 854 | rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths, GFP_KERNEL); |
| 855 | if (!rt->path_rec) |
| 856 | goto err; |
| 857 | |
| 858 | if (cma_get_net_info(ib_event->private_data, listen_id->ps, |
| 859 | &ip_ver, &port, &src, &dst)) |
| 860 | goto err; |
| 861 | |
| 862 | cma_save_net_info(&id->route.addr, &listen_id->route.addr, |
| 863 | ip_ver, port, src, dst); |
| 864 | rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path; |
| 865 | if (rt->num_paths == 2) |
| 866 | rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path; |
| 867 | |
| 868 | ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid); |
| 869 | ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid); |
| 870 | ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey)); |
| 871 | rt->addr.dev_addr.dev_type = IB_NODE_CA; |
| 872 | |
| 873 | id_priv = container_of(id, struct rdma_id_private, id); |
| 874 | id_priv->state = CMA_CONNECT; |
| 875 | return id_priv; |
| 876 | err: |
| 877 | rdma_destroy_id(id); |
| 878 | return NULL; |
| 879 | } |
| 880 | |
| 881 | static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) |
| 882 | { |
| 883 | struct rdma_id_private *listen_id, *conn_id; |
| 884 | int offset, ret; |
| 885 | |
| 886 | listen_id = cm_id->context; |
| 887 | atomic_inc(&listen_id->dev_remove); |
| 888 | if (!cma_comp(listen_id, CMA_LISTEN)) { |
| 889 | ret = -ECONNABORTED; |
| 890 | goto out; |
| 891 | } |
| 892 | |
| 893 | conn_id = cma_new_id(&listen_id->id, ib_event); |
| 894 | if (!conn_id) { |
| 895 | ret = -ENOMEM; |
| 896 | goto out; |
| 897 | } |
| 898 | |
| 899 | atomic_inc(&conn_id->dev_remove); |
| 900 | ret = cma_acquire_ib_dev(conn_id); |
| 901 | if (ret) { |
| 902 | ret = -ENODEV; |
| 903 | cma_release_remove(conn_id); |
| 904 | rdma_destroy_id(&conn_id->id); |
| 905 | goto out; |
| 906 | } |
| 907 | |
| 908 | conn_id->cm_id.ib = cm_id; |
| 909 | cm_id->context = conn_id; |
| 910 | cm_id->cm_handler = cma_ib_handler; |
| 911 | |
| 912 | offset = cma_user_data_offset(listen_id->id.ps); |
| 913 | ret = cma_notify_user(conn_id, RDMA_CM_EVENT_CONNECT_REQUEST, 0, |
| 914 | ib_event->private_data + offset, |
| 915 | IB_CM_REQ_PRIVATE_DATA_SIZE - offset); |
| 916 | if (ret) { |
| 917 | /* Destroy the CM ID by returning a non-zero value. */ |
| 918 | conn_id->cm_id.ib = NULL; |
| 919 | cma_exch(conn_id, CMA_DESTROYING); |
| 920 | cma_release_remove(conn_id); |
| 921 | rdma_destroy_id(&conn_id->id); |
| 922 | } |
| 923 | out: |
| 924 | cma_release_remove(listen_id); |
| 925 | return ret; |
| 926 | } |
| 927 | |
| 928 | static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr) |
| 929 | { |
| 930 | return cpu_to_be64(((u64)ps << 16) + |
| 931 | be16_to_cpu(((struct sockaddr_in *) addr)->sin_port)); |
| 932 | } |
| 933 | |
| 934 | static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr, |
| 935 | struct ib_cm_compare_data *compare) |
| 936 | { |
| 937 | struct cma_hdr *cma_data, *cma_mask; |
| 938 | struct sdp_hh *sdp_data, *sdp_mask; |
| 939 | __u32 ip4_addr; |
| 940 | struct in6_addr ip6_addr; |
| 941 | |
| 942 | memset(compare, 0, sizeof *compare); |
| 943 | cma_data = (void *) compare->data; |
| 944 | cma_mask = (void *) compare->mask; |
| 945 | sdp_data = (void *) compare->data; |
| 946 | sdp_mask = (void *) compare->mask; |
| 947 | |
| 948 | switch (addr->sa_family) { |
| 949 | case AF_INET: |
| 950 | ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr; |
| 951 | if (ps == RDMA_PS_SDP) { |
| 952 | sdp_set_ip_ver(sdp_data, 4); |
| 953 | sdp_set_ip_ver(sdp_mask, 0xF); |
| 954 | sdp_data->dst_addr.ip4.addr = ip4_addr; |
| 955 | sdp_mask->dst_addr.ip4.addr = ~0; |
| 956 | } else { |
| 957 | cma_set_ip_ver(cma_data, 4); |
| 958 | cma_set_ip_ver(cma_mask, 0xF); |
| 959 | cma_data->dst_addr.ip4.addr = ip4_addr; |
| 960 | cma_mask->dst_addr.ip4.addr = ~0; |
| 961 | } |
| 962 | break; |
| 963 | case AF_INET6: |
| 964 | ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr; |
| 965 | if (ps == RDMA_PS_SDP) { |
| 966 | sdp_set_ip_ver(sdp_data, 6); |
| 967 | sdp_set_ip_ver(sdp_mask, 0xF); |
| 968 | sdp_data->dst_addr.ip6 = ip6_addr; |
| 969 | memset(&sdp_mask->dst_addr.ip6, 0xFF, |
| 970 | sizeof sdp_mask->dst_addr.ip6); |
| 971 | } else { |
| 972 | cma_set_ip_ver(cma_data, 6); |
| 973 | cma_set_ip_ver(cma_mask, 0xF); |
| 974 | cma_data->dst_addr.ip6 = ip6_addr; |
| 975 | memset(&cma_mask->dst_addr.ip6, 0xFF, |
| 976 | sizeof cma_mask->dst_addr.ip6); |
| 977 | } |
| 978 | break; |
| 979 | default: |
| 980 | break; |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | static int cma_ib_listen(struct rdma_id_private *id_priv) |
| 985 | { |
| 986 | struct ib_cm_compare_data compare_data; |
| 987 | struct sockaddr *addr; |
| 988 | __be64 svc_id; |
| 989 | int ret; |
| 990 | |
| 991 | id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler, |
| 992 | id_priv); |
| 993 | if (IS_ERR(id_priv->cm_id.ib)) |
| 994 | return PTR_ERR(id_priv->cm_id.ib); |
| 995 | |
| 996 | addr = &id_priv->id.route.addr.src_addr; |
| 997 | svc_id = cma_get_service_id(id_priv->id.ps, addr); |
| 998 | if (cma_any_addr(addr)) |
| 999 | ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL); |
| 1000 | else { |
| 1001 | cma_set_compare_data(id_priv->id.ps, addr, &compare_data); |
| 1002 | ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data); |
| 1003 | } |
| 1004 | |
| 1005 | if (ret) { |
| 1006 | ib_destroy_cm_id(id_priv->cm_id.ib); |
| 1007 | id_priv->cm_id.ib = NULL; |
| 1008 | } |
| 1009 | |
| 1010 | return ret; |
| 1011 | } |
| 1012 | |
| 1013 | static int cma_listen_handler(struct rdma_cm_id *id, |
| 1014 | struct rdma_cm_event *event) |
| 1015 | { |
| 1016 | struct rdma_id_private *id_priv = id->context; |
| 1017 | |
| 1018 | id->context = id_priv->id.context; |
| 1019 | id->event_handler = id_priv->id.event_handler; |
| 1020 | return id_priv->id.event_handler(id, event); |
| 1021 | } |
| 1022 | |
| 1023 | static void cma_listen_on_dev(struct rdma_id_private *id_priv, |
| 1024 | struct cma_device *cma_dev) |
| 1025 | { |
| 1026 | struct rdma_id_private *dev_id_priv; |
| 1027 | struct rdma_cm_id *id; |
| 1028 | int ret; |
| 1029 | |
| 1030 | id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps); |
| 1031 | if (IS_ERR(id)) |
| 1032 | return; |
| 1033 | |
| 1034 | dev_id_priv = container_of(id, struct rdma_id_private, id); |
| 1035 | |
| 1036 | dev_id_priv->state = CMA_ADDR_BOUND; |
| 1037 | memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr, |
| 1038 | ip_addr_size(&id_priv->id.route.addr.src_addr)); |
| 1039 | |
| 1040 | cma_attach_to_dev(dev_id_priv, cma_dev); |
| 1041 | list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list); |
| 1042 | |
| 1043 | ret = rdma_listen(id, id_priv->backlog); |
| 1044 | if (ret) |
| 1045 | goto err; |
| 1046 | |
| 1047 | return; |
| 1048 | err: |
| 1049 | cma_destroy_listen(dev_id_priv); |
| 1050 | } |
| 1051 | |
| 1052 | static void cma_listen_on_all(struct rdma_id_private *id_priv) |
| 1053 | { |
| 1054 | struct cma_device *cma_dev; |
| 1055 | |
| 1056 | mutex_lock(&lock); |
| 1057 | list_add_tail(&id_priv->list, &listen_any_list); |
| 1058 | list_for_each_entry(cma_dev, &dev_list, list) |
| 1059 | cma_listen_on_dev(id_priv, cma_dev); |
| 1060 | mutex_unlock(&lock); |
| 1061 | } |
| 1062 | |
| 1063 | static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af) |
| 1064 | { |
| 1065 | struct sockaddr_in addr_in; |
| 1066 | |
| 1067 | memset(&addr_in, 0, sizeof addr_in); |
| 1068 | addr_in.sin_family = af; |
| 1069 | return rdma_bind_addr(id, (struct sockaddr *) &addr_in); |
| 1070 | } |
| 1071 | |
| 1072 | int rdma_listen(struct rdma_cm_id *id, int backlog) |
| 1073 | { |
| 1074 | struct rdma_id_private *id_priv; |
| 1075 | int ret; |
| 1076 | |
| 1077 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1078 | if (id_priv->state == CMA_IDLE) { |
| 1079 | ret = cma_bind_any(id, AF_INET); |
| 1080 | if (ret) |
| 1081 | return ret; |
| 1082 | } |
| 1083 | |
| 1084 | if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN)) |
| 1085 | return -EINVAL; |
| 1086 | |
| 1087 | id_priv->backlog = backlog; |
| 1088 | if (id->device) { |
| 1089 | switch (id->device->node_type) { |
| 1090 | case IB_NODE_CA: |
| 1091 | ret = cma_ib_listen(id_priv); |
| 1092 | if (ret) |
| 1093 | goto err; |
| 1094 | break; |
| 1095 | default: |
| 1096 | ret = -ENOSYS; |
| 1097 | goto err; |
| 1098 | } |
| 1099 | } else |
| 1100 | cma_listen_on_all(id_priv); |
| 1101 | |
| 1102 | return 0; |
| 1103 | err: |
| 1104 | id_priv->backlog = 0; |
| 1105 | cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND); |
| 1106 | return ret; |
| 1107 | } |
| 1108 | EXPORT_SYMBOL(rdma_listen); |
| 1109 | |
| 1110 | static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec, |
| 1111 | void *context) |
| 1112 | { |
| 1113 | struct cma_work *work = context; |
| 1114 | struct rdma_route *route; |
| 1115 | |
| 1116 | route = &work->id->id.route; |
| 1117 | |
| 1118 | if (!status) { |
| 1119 | route->num_paths = 1; |
| 1120 | *route->path_rec = *path_rec; |
| 1121 | } else { |
| 1122 | work->old_state = CMA_ROUTE_QUERY; |
| 1123 | work->new_state = CMA_ADDR_RESOLVED; |
| 1124 | work->event.event = RDMA_CM_EVENT_ROUTE_ERROR; |
| 1125 | } |
| 1126 | |
| 1127 | queue_work(cma_wq, &work->work); |
| 1128 | } |
| 1129 | |
| 1130 | static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms, |
| 1131 | struct cma_work *work) |
| 1132 | { |
| 1133 | struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr; |
| 1134 | struct ib_sa_path_rec path_rec; |
| 1135 | |
| 1136 | memset(&path_rec, 0, sizeof path_rec); |
| 1137 | path_rec.sgid = *ib_addr_get_sgid(addr); |
| 1138 | path_rec.dgid = *ib_addr_get_dgid(addr); |
| 1139 | path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr)); |
| 1140 | path_rec.numb_path = 1; |
| 1141 | |
| 1142 | id_priv->query_id = ib_sa_path_rec_get(id_priv->id.device, |
| 1143 | id_priv->id.port_num, &path_rec, |
| 1144 | IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | |
| 1145 | IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH, |
| 1146 | timeout_ms, GFP_KERNEL, |
| 1147 | cma_query_handler, work, &id_priv->query); |
| 1148 | |
| 1149 | return (id_priv->query_id < 0) ? id_priv->query_id : 0; |
| 1150 | } |
| 1151 | |
| 1152 | static void cma_work_handler(void *data) |
| 1153 | { |
| 1154 | struct cma_work *work = data; |
| 1155 | struct rdma_id_private *id_priv = work->id; |
| 1156 | int destroy = 0; |
| 1157 | |
| 1158 | atomic_inc(&id_priv->dev_remove); |
| 1159 | if (!cma_comp_exch(id_priv, work->old_state, work->new_state)) |
| 1160 | goto out; |
| 1161 | |
| 1162 | if (id_priv->id.event_handler(&id_priv->id, &work->event)) { |
| 1163 | cma_exch(id_priv, CMA_DESTROYING); |
| 1164 | destroy = 1; |
| 1165 | } |
| 1166 | out: |
| 1167 | cma_release_remove(id_priv); |
| 1168 | cma_deref_id(id_priv); |
| 1169 | if (destroy) |
| 1170 | rdma_destroy_id(&id_priv->id); |
| 1171 | kfree(work); |
| 1172 | } |
| 1173 | |
| 1174 | static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms) |
| 1175 | { |
| 1176 | struct rdma_route *route = &id_priv->id.route; |
| 1177 | struct cma_work *work; |
| 1178 | int ret; |
| 1179 | |
| 1180 | work = kzalloc(sizeof *work, GFP_KERNEL); |
| 1181 | if (!work) |
| 1182 | return -ENOMEM; |
| 1183 | |
| 1184 | work->id = id_priv; |
| 1185 | INIT_WORK(&work->work, cma_work_handler, work); |
| 1186 | work->old_state = CMA_ROUTE_QUERY; |
| 1187 | work->new_state = CMA_ROUTE_RESOLVED; |
| 1188 | work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; |
| 1189 | |
| 1190 | route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL); |
| 1191 | if (!route->path_rec) { |
| 1192 | ret = -ENOMEM; |
| 1193 | goto err1; |
| 1194 | } |
| 1195 | |
| 1196 | ret = cma_query_ib_route(id_priv, timeout_ms, work); |
| 1197 | if (ret) |
| 1198 | goto err2; |
| 1199 | |
| 1200 | return 0; |
| 1201 | err2: |
| 1202 | kfree(route->path_rec); |
| 1203 | route->path_rec = NULL; |
| 1204 | err1: |
| 1205 | kfree(work); |
| 1206 | return ret; |
| 1207 | } |
| 1208 | |
| 1209 | int rdma_set_ib_paths(struct rdma_cm_id *id, |
| 1210 | struct ib_sa_path_rec *path_rec, int num_paths) |
| 1211 | { |
| 1212 | struct rdma_id_private *id_priv; |
| 1213 | int ret; |
| 1214 | |
| 1215 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1216 | if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED)) |
| 1217 | return -EINVAL; |
| 1218 | |
| 1219 | id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL); |
| 1220 | if (!id->route.path_rec) { |
| 1221 | ret = -ENOMEM; |
| 1222 | goto err; |
| 1223 | } |
| 1224 | |
| 1225 | memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths); |
| 1226 | return 0; |
| 1227 | err: |
| 1228 | cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED); |
| 1229 | return ret; |
| 1230 | } |
| 1231 | EXPORT_SYMBOL(rdma_set_ib_paths); |
| 1232 | |
| 1233 | int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms) |
| 1234 | { |
| 1235 | struct rdma_id_private *id_priv; |
| 1236 | int ret; |
| 1237 | |
| 1238 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1239 | if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY)) |
| 1240 | return -EINVAL; |
| 1241 | |
| 1242 | atomic_inc(&id_priv->refcount); |
| 1243 | switch (id->device->node_type) { |
| 1244 | case IB_NODE_CA: |
| 1245 | ret = cma_resolve_ib_route(id_priv, timeout_ms); |
| 1246 | break; |
| 1247 | default: |
| 1248 | ret = -ENOSYS; |
| 1249 | break; |
| 1250 | } |
| 1251 | if (ret) |
| 1252 | goto err; |
| 1253 | |
| 1254 | return 0; |
| 1255 | err: |
| 1256 | cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED); |
| 1257 | cma_deref_id(id_priv); |
| 1258 | return ret; |
| 1259 | } |
| 1260 | EXPORT_SYMBOL(rdma_resolve_route); |
| 1261 | |
| 1262 | static int cma_bind_loopback(struct rdma_id_private *id_priv) |
| 1263 | { |
| 1264 | struct cma_device *cma_dev; |
| 1265 | struct ib_port_attr port_attr; |
| 1266 | union ib_gid *gid; |
| 1267 | u16 pkey; |
| 1268 | int ret; |
| 1269 | u8 p; |
| 1270 | |
| 1271 | mutex_lock(&lock); |
| 1272 | list_for_each_entry(cma_dev, &dev_list, list) |
| 1273 | for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p) |
| 1274 | if (!ib_query_port (cma_dev->device, p, &port_attr) && |
| 1275 | port_attr.state == IB_PORT_ACTIVE) |
| 1276 | goto port_found; |
| 1277 | |
| 1278 | if (!list_empty(&dev_list)) { |
| 1279 | p = 1; |
| 1280 | cma_dev = list_entry(dev_list.next, struct cma_device, list); |
| 1281 | } else { |
| 1282 | ret = -ENODEV; |
| 1283 | goto out; |
| 1284 | } |
| 1285 | |
| 1286 | port_found: |
| 1287 | gid = ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr); |
| 1288 | ret = ib_get_cached_gid(cma_dev->device, p, 0, gid); |
| 1289 | if (ret) |
| 1290 | goto out; |
| 1291 | |
| 1292 | ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey); |
| 1293 | if (ret) |
| 1294 | goto out; |
| 1295 | |
| 1296 | ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey); |
| 1297 | id_priv->id.port_num = p; |
| 1298 | cma_attach_to_dev(id_priv, cma_dev); |
| 1299 | out: |
| 1300 | mutex_unlock(&lock); |
| 1301 | return ret; |
| 1302 | } |
| 1303 | |
| 1304 | static void addr_handler(int status, struct sockaddr *src_addr, |
| 1305 | struct rdma_dev_addr *dev_addr, void *context) |
| 1306 | { |
| 1307 | struct rdma_id_private *id_priv = context; |
| 1308 | enum rdma_cm_event_type event; |
| 1309 | |
| 1310 | atomic_inc(&id_priv->dev_remove); |
| 1311 | if (!id_priv->cma_dev && !status) |
| 1312 | status = cma_acquire_dev(id_priv); |
| 1313 | |
| 1314 | if (status) { |
| 1315 | if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND)) |
| 1316 | goto out; |
| 1317 | event = RDMA_CM_EVENT_ADDR_ERROR; |
| 1318 | } else { |
| 1319 | if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) |
| 1320 | goto out; |
| 1321 | memcpy(&id_priv->id.route.addr.src_addr, src_addr, |
| 1322 | ip_addr_size(src_addr)); |
| 1323 | event = RDMA_CM_EVENT_ADDR_RESOLVED; |
| 1324 | } |
| 1325 | |
| 1326 | if (cma_notify_user(id_priv, event, status, NULL, 0)) { |
| 1327 | cma_exch(id_priv, CMA_DESTROYING); |
| 1328 | cma_release_remove(id_priv); |
| 1329 | cma_deref_id(id_priv); |
| 1330 | rdma_destroy_id(&id_priv->id); |
| 1331 | return; |
| 1332 | } |
| 1333 | out: |
| 1334 | cma_release_remove(id_priv); |
| 1335 | cma_deref_id(id_priv); |
| 1336 | } |
| 1337 | |
| 1338 | static int cma_resolve_loopback(struct rdma_id_private *id_priv) |
| 1339 | { |
| 1340 | struct cma_work *work; |
| 1341 | struct sockaddr_in *src_in, *dst_in; |
| 1342 | int ret; |
| 1343 | |
| 1344 | work = kzalloc(sizeof *work, GFP_KERNEL); |
| 1345 | if (!work) |
| 1346 | return -ENOMEM; |
| 1347 | |
| 1348 | if (!id_priv->cma_dev) { |
| 1349 | ret = cma_bind_loopback(id_priv); |
| 1350 | if (ret) |
| 1351 | goto err; |
| 1352 | } |
| 1353 | |
| 1354 | ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, |
| 1355 | ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr)); |
| 1356 | |
| 1357 | if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) { |
| 1358 | src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr; |
| 1359 | dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr; |
| 1360 | src_in->sin_family = dst_in->sin_family; |
| 1361 | src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr; |
| 1362 | } |
| 1363 | |
| 1364 | work->id = id_priv; |
| 1365 | INIT_WORK(&work->work, cma_work_handler, work); |
| 1366 | work->old_state = CMA_ADDR_QUERY; |
| 1367 | work->new_state = CMA_ADDR_RESOLVED; |
| 1368 | work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED; |
| 1369 | queue_work(cma_wq, &work->work); |
| 1370 | return 0; |
| 1371 | err: |
| 1372 | kfree(work); |
| 1373 | return ret; |
| 1374 | } |
| 1375 | |
| 1376 | static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, |
| 1377 | struct sockaddr *dst_addr) |
| 1378 | { |
| 1379 | if (src_addr && src_addr->sa_family) |
| 1380 | return rdma_bind_addr(id, src_addr); |
| 1381 | else |
| 1382 | return cma_bind_any(id, dst_addr->sa_family); |
| 1383 | } |
| 1384 | |
| 1385 | int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, |
| 1386 | struct sockaddr *dst_addr, int timeout_ms) |
| 1387 | { |
| 1388 | struct rdma_id_private *id_priv; |
| 1389 | int ret; |
| 1390 | |
| 1391 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1392 | if (id_priv->state == CMA_IDLE) { |
| 1393 | ret = cma_bind_addr(id, src_addr, dst_addr); |
| 1394 | if (ret) |
| 1395 | return ret; |
| 1396 | } |
| 1397 | |
| 1398 | if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY)) |
| 1399 | return -EINVAL; |
| 1400 | |
| 1401 | atomic_inc(&id_priv->refcount); |
| 1402 | memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr)); |
| 1403 | if (cma_any_addr(dst_addr)) |
| 1404 | ret = cma_resolve_loopback(id_priv); |
| 1405 | else |
| 1406 | ret = rdma_resolve_ip(&id->route.addr.src_addr, dst_addr, |
| 1407 | &id->route.addr.dev_addr, |
| 1408 | timeout_ms, addr_handler, id_priv); |
| 1409 | if (ret) |
| 1410 | goto err; |
| 1411 | |
| 1412 | return 0; |
| 1413 | err: |
| 1414 | cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND); |
| 1415 | cma_deref_id(id_priv); |
| 1416 | return ret; |
| 1417 | } |
| 1418 | EXPORT_SYMBOL(rdma_resolve_addr); |
| 1419 | |
| 1420 | static void cma_bind_port(struct rdma_bind_list *bind_list, |
| 1421 | struct rdma_id_private *id_priv) |
| 1422 | { |
| 1423 | struct sockaddr_in *sin; |
| 1424 | |
| 1425 | sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; |
| 1426 | sin->sin_port = htons(bind_list->port); |
| 1427 | id_priv->bind_list = bind_list; |
| 1428 | hlist_add_head(&id_priv->node, &bind_list->owners); |
| 1429 | } |
| 1430 | |
| 1431 | static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv, |
| 1432 | unsigned short snum) |
| 1433 | { |
| 1434 | struct rdma_bind_list *bind_list; |
| 1435 | int port, start, ret; |
| 1436 | |
| 1437 | bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); |
| 1438 | if (!bind_list) |
| 1439 | return -ENOMEM; |
| 1440 | |
| 1441 | start = snum ? snum : sysctl_local_port_range[0]; |
| 1442 | |
| 1443 | do { |
| 1444 | ret = idr_get_new_above(ps, bind_list, start, &port); |
| 1445 | } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); |
| 1446 | |
| 1447 | if (ret) |
| 1448 | goto err; |
| 1449 | |
| 1450 | if ((snum && port != snum) || |
| 1451 | (!snum && port > sysctl_local_port_range[1])) { |
| 1452 | idr_remove(ps, port); |
| 1453 | ret = -EADDRNOTAVAIL; |
| 1454 | goto err; |
| 1455 | } |
| 1456 | |
| 1457 | bind_list->ps = ps; |
| 1458 | bind_list->port = (unsigned short) port; |
| 1459 | cma_bind_port(bind_list, id_priv); |
| 1460 | return 0; |
| 1461 | err: |
| 1462 | kfree(bind_list); |
| 1463 | return ret; |
| 1464 | } |
| 1465 | |
| 1466 | static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv) |
| 1467 | { |
| 1468 | struct rdma_id_private *cur_id; |
| 1469 | struct sockaddr_in *sin, *cur_sin; |
| 1470 | struct rdma_bind_list *bind_list; |
| 1471 | struct hlist_node *node; |
| 1472 | unsigned short snum; |
| 1473 | |
| 1474 | sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; |
| 1475 | snum = ntohs(sin->sin_port); |
| 1476 | if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) |
| 1477 | return -EACCES; |
| 1478 | |
| 1479 | bind_list = idr_find(ps, snum); |
| 1480 | if (!bind_list) |
| 1481 | return cma_alloc_port(ps, id_priv, snum); |
| 1482 | |
| 1483 | /* |
| 1484 | * We don't support binding to any address if anyone is bound to |
| 1485 | * a specific address on the same port. |
| 1486 | */ |
| 1487 | if (cma_any_addr(&id_priv->id.route.addr.src_addr)) |
| 1488 | return -EADDRNOTAVAIL; |
| 1489 | |
| 1490 | hlist_for_each_entry(cur_id, node, &bind_list->owners, node) { |
| 1491 | if (cma_any_addr(&cur_id->id.route.addr.src_addr)) |
| 1492 | return -EADDRNOTAVAIL; |
| 1493 | |
| 1494 | cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr; |
| 1495 | if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr) |
| 1496 | return -EADDRINUSE; |
| 1497 | } |
| 1498 | |
| 1499 | cma_bind_port(bind_list, id_priv); |
| 1500 | return 0; |
| 1501 | } |
| 1502 | |
| 1503 | static int cma_get_port(struct rdma_id_private *id_priv) |
| 1504 | { |
| 1505 | struct idr *ps; |
| 1506 | int ret; |
| 1507 | |
| 1508 | switch (id_priv->id.ps) { |
| 1509 | case RDMA_PS_SDP: |
| 1510 | ps = &sdp_ps; |
| 1511 | break; |
| 1512 | case RDMA_PS_TCP: |
| 1513 | ps = &tcp_ps; |
| 1514 | break; |
| 1515 | default: |
| 1516 | return -EPROTONOSUPPORT; |
| 1517 | } |
| 1518 | |
| 1519 | mutex_lock(&lock); |
| 1520 | if (cma_any_port(&id_priv->id.route.addr.src_addr)) |
| 1521 | ret = cma_alloc_port(ps, id_priv, 0); |
| 1522 | else |
| 1523 | ret = cma_use_port(ps, id_priv); |
| 1524 | mutex_unlock(&lock); |
| 1525 | |
| 1526 | return ret; |
| 1527 | } |
| 1528 | |
| 1529 | int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr) |
| 1530 | { |
| 1531 | struct rdma_id_private *id_priv; |
| 1532 | int ret; |
| 1533 | |
| 1534 | if (addr->sa_family != AF_INET) |
| 1535 | return -EAFNOSUPPORT; |
| 1536 | |
| 1537 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1538 | if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND)) |
| 1539 | return -EINVAL; |
| 1540 | |
| 1541 | if (!cma_any_addr(addr)) { |
| 1542 | ret = rdma_translate_ip(addr, &id->route.addr.dev_addr); |
| 1543 | if (!ret) |
| 1544 | ret = cma_acquire_dev(id_priv); |
| 1545 | if (ret) |
| 1546 | goto err; |
| 1547 | } |
| 1548 | |
| 1549 | memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr)); |
| 1550 | ret = cma_get_port(id_priv); |
| 1551 | if (ret) |
| 1552 | goto err; |
| 1553 | |
| 1554 | return 0; |
| 1555 | err: |
| 1556 | cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE); |
| 1557 | return ret; |
| 1558 | } |
| 1559 | EXPORT_SYMBOL(rdma_bind_addr); |
| 1560 | |
| 1561 | static int cma_format_hdr(void *hdr, enum rdma_port_space ps, |
| 1562 | struct rdma_route *route) |
| 1563 | { |
| 1564 | struct sockaddr_in *src4, *dst4; |
| 1565 | struct cma_hdr *cma_hdr; |
| 1566 | struct sdp_hh *sdp_hdr; |
| 1567 | |
| 1568 | src4 = (struct sockaddr_in *) &route->addr.src_addr; |
| 1569 | dst4 = (struct sockaddr_in *) &route->addr.dst_addr; |
| 1570 | |
| 1571 | switch (ps) { |
| 1572 | case RDMA_PS_SDP: |
| 1573 | sdp_hdr = hdr; |
| 1574 | if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION) |
| 1575 | return -EINVAL; |
| 1576 | sdp_set_ip_ver(sdp_hdr, 4); |
| 1577 | sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; |
| 1578 | sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; |
| 1579 | sdp_hdr->port = src4->sin_port; |
| 1580 | break; |
| 1581 | default: |
| 1582 | cma_hdr = hdr; |
| 1583 | cma_hdr->cma_version = CMA_VERSION; |
| 1584 | cma_set_ip_ver(cma_hdr, 4); |
| 1585 | cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr; |
| 1586 | cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr; |
| 1587 | cma_hdr->port = src4->sin_port; |
| 1588 | break; |
| 1589 | } |
| 1590 | return 0; |
| 1591 | } |
| 1592 | |
| 1593 | static int cma_connect_ib(struct rdma_id_private *id_priv, |
| 1594 | struct rdma_conn_param *conn_param) |
| 1595 | { |
| 1596 | struct ib_cm_req_param req; |
| 1597 | struct rdma_route *route; |
| 1598 | void *private_data; |
| 1599 | int offset, ret; |
| 1600 | |
| 1601 | memset(&req, 0, sizeof req); |
| 1602 | offset = cma_user_data_offset(id_priv->id.ps); |
| 1603 | req.private_data_len = offset + conn_param->private_data_len; |
| 1604 | private_data = kzalloc(req.private_data_len, GFP_ATOMIC); |
| 1605 | if (!private_data) |
| 1606 | return -ENOMEM; |
| 1607 | |
| 1608 | if (conn_param->private_data && conn_param->private_data_len) |
| 1609 | memcpy(private_data + offset, conn_param->private_data, |
| 1610 | conn_param->private_data_len); |
| 1611 | |
| 1612 | id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler, |
| 1613 | id_priv); |
| 1614 | if (IS_ERR(id_priv->cm_id.ib)) { |
| 1615 | ret = PTR_ERR(id_priv->cm_id.ib); |
| 1616 | goto out; |
| 1617 | } |
| 1618 | |
| 1619 | route = &id_priv->id.route; |
| 1620 | ret = cma_format_hdr(private_data, id_priv->id.ps, route); |
| 1621 | if (ret) |
| 1622 | goto out; |
| 1623 | req.private_data = private_data; |
| 1624 | |
| 1625 | req.primary_path = &route->path_rec[0]; |
| 1626 | if (route->num_paths == 2) |
| 1627 | req.alternate_path = &route->path_rec[1]; |
| 1628 | |
| 1629 | req.service_id = cma_get_service_id(id_priv->id.ps, |
| 1630 | &route->addr.dst_addr); |
| 1631 | req.qp_num = id_priv->qp_num; |
| 1632 | req.qp_type = id_priv->qp_type; |
| 1633 | req.starting_psn = id_priv->seq_num; |
| 1634 | req.responder_resources = conn_param->responder_resources; |
| 1635 | req.initiator_depth = conn_param->initiator_depth; |
| 1636 | req.flow_control = conn_param->flow_control; |
| 1637 | req.retry_count = conn_param->retry_count; |
| 1638 | req.rnr_retry_count = conn_param->rnr_retry_count; |
| 1639 | req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; |
| 1640 | req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT; |
| 1641 | req.max_cm_retries = CMA_MAX_CM_RETRIES; |
| 1642 | req.srq = id_priv->srq ? 1 : 0; |
| 1643 | |
| 1644 | ret = ib_send_cm_req(id_priv->cm_id.ib, &req); |
| 1645 | out: |
| 1646 | kfree(private_data); |
| 1647 | return ret; |
| 1648 | } |
| 1649 | |
| 1650 | int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) |
| 1651 | { |
| 1652 | struct rdma_id_private *id_priv; |
| 1653 | int ret; |
| 1654 | |
| 1655 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1656 | if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT)) |
| 1657 | return -EINVAL; |
| 1658 | |
| 1659 | if (!id->qp) { |
| 1660 | id_priv->qp_num = conn_param->qp_num; |
| 1661 | id_priv->qp_type = conn_param->qp_type; |
| 1662 | id_priv->srq = conn_param->srq; |
| 1663 | } |
| 1664 | |
| 1665 | switch (id->device->node_type) { |
| 1666 | case IB_NODE_CA: |
| 1667 | ret = cma_connect_ib(id_priv, conn_param); |
| 1668 | break; |
| 1669 | default: |
| 1670 | ret = -ENOSYS; |
| 1671 | break; |
| 1672 | } |
| 1673 | if (ret) |
| 1674 | goto err; |
| 1675 | |
| 1676 | return 0; |
| 1677 | err: |
| 1678 | cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED); |
| 1679 | return ret; |
| 1680 | } |
| 1681 | EXPORT_SYMBOL(rdma_connect); |
| 1682 | |
| 1683 | static int cma_accept_ib(struct rdma_id_private *id_priv, |
| 1684 | struct rdma_conn_param *conn_param) |
| 1685 | { |
| 1686 | struct ib_cm_rep_param rep; |
| 1687 | int ret; |
| 1688 | |
| 1689 | ret = cma_modify_qp_rtr(&id_priv->id); |
| 1690 | if (ret) |
| 1691 | return ret; |
| 1692 | |
| 1693 | memset(&rep, 0, sizeof rep); |
| 1694 | rep.qp_num = id_priv->qp_num; |
| 1695 | rep.starting_psn = id_priv->seq_num; |
| 1696 | rep.private_data = conn_param->private_data; |
| 1697 | rep.private_data_len = conn_param->private_data_len; |
| 1698 | rep.responder_resources = conn_param->responder_resources; |
| 1699 | rep.initiator_depth = conn_param->initiator_depth; |
| 1700 | rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT; |
| 1701 | rep.failover_accepted = 0; |
| 1702 | rep.flow_control = conn_param->flow_control; |
| 1703 | rep.rnr_retry_count = conn_param->rnr_retry_count; |
| 1704 | rep.srq = id_priv->srq ? 1 : 0; |
| 1705 | |
| 1706 | return ib_send_cm_rep(id_priv->cm_id.ib, &rep); |
| 1707 | } |
| 1708 | |
| 1709 | int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param) |
| 1710 | { |
| 1711 | struct rdma_id_private *id_priv; |
| 1712 | int ret; |
| 1713 | |
| 1714 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1715 | if (!cma_comp(id_priv, CMA_CONNECT)) |
| 1716 | return -EINVAL; |
| 1717 | |
| 1718 | if (!id->qp && conn_param) { |
| 1719 | id_priv->qp_num = conn_param->qp_num; |
| 1720 | id_priv->qp_type = conn_param->qp_type; |
| 1721 | id_priv->srq = conn_param->srq; |
| 1722 | } |
| 1723 | |
| 1724 | switch (id->device->node_type) { |
| 1725 | case IB_NODE_CA: |
| 1726 | if (conn_param) |
| 1727 | ret = cma_accept_ib(id_priv, conn_param); |
| 1728 | else |
| 1729 | ret = cma_rep_recv(id_priv); |
| 1730 | break; |
| 1731 | default: |
| 1732 | ret = -ENOSYS; |
| 1733 | break; |
| 1734 | } |
| 1735 | |
| 1736 | if (ret) |
| 1737 | goto reject; |
| 1738 | |
| 1739 | return 0; |
| 1740 | reject: |
| 1741 | cma_modify_qp_err(id); |
| 1742 | rdma_reject(id, NULL, 0); |
| 1743 | return ret; |
| 1744 | } |
| 1745 | EXPORT_SYMBOL(rdma_accept); |
| 1746 | |
| 1747 | int rdma_reject(struct rdma_cm_id *id, const void *private_data, |
| 1748 | u8 private_data_len) |
| 1749 | { |
| 1750 | struct rdma_id_private *id_priv; |
| 1751 | int ret; |
| 1752 | |
| 1753 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1754 | if (!cma_comp(id_priv, CMA_CONNECT)) |
| 1755 | return -EINVAL; |
| 1756 | |
| 1757 | switch (id->device->node_type) { |
| 1758 | case IB_NODE_CA: |
| 1759 | ret = ib_send_cm_rej(id_priv->cm_id.ib, |
| 1760 | IB_CM_REJ_CONSUMER_DEFINED, NULL, 0, |
| 1761 | private_data, private_data_len); |
| 1762 | break; |
| 1763 | default: |
| 1764 | ret = -ENOSYS; |
| 1765 | break; |
| 1766 | } |
| 1767 | return ret; |
| 1768 | } |
| 1769 | EXPORT_SYMBOL(rdma_reject); |
| 1770 | |
| 1771 | int rdma_disconnect(struct rdma_cm_id *id) |
| 1772 | { |
| 1773 | struct rdma_id_private *id_priv; |
| 1774 | int ret; |
| 1775 | |
| 1776 | id_priv = container_of(id, struct rdma_id_private, id); |
| 1777 | if (!cma_comp(id_priv, CMA_CONNECT) && |
| 1778 | !cma_comp(id_priv, CMA_DISCONNECT)) |
| 1779 | return -EINVAL; |
| 1780 | |
| 1781 | ret = cma_modify_qp_err(id); |
| 1782 | if (ret) |
| 1783 | goto out; |
| 1784 | |
| 1785 | switch (id->device->node_type) { |
| 1786 | case IB_NODE_CA: |
| 1787 | /* Initiate or respond to a disconnect. */ |
| 1788 | if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) |
| 1789 | ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0); |
| 1790 | break; |
| 1791 | default: |
| 1792 | break; |
| 1793 | } |
| 1794 | out: |
| 1795 | return ret; |
| 1796 | } |
| 1797 | EXPORT_SYMBOL(rdma_disconnect); |
| 1798 | |
| 1799 | static void cma_add_one(struct ib_device *device) |
| 1800 | { |
| 1801 | struct cma_device *cma_dev; |
| 1802 | struct rdma_id_private *id_priv; |
| 1803 | |
| 1804 | cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL); |
| 1805 | if (!cma_dev) |
| 1806 | return; |
| 1807 | |
| 1808 | cma_dev->device = device; |
| 1809 | cma_dev->node_guid = device->node_guid; |
| 1810 | if (!cma_dev->node_guid) |
| 1811 | goto err; |
| 1812 | |
| 1813 | init_completion(&cma_dev->comp); |
| 1814 | atomic_set(&cma_dev->refcount, 1); |
| 1815 | INIT_LIST_HEAD(&cma_dev->id_list); |
| 1816 | ib_set_client_data(device, &cma_client, cma_dev); |
| 1817 | |
| 1818 | mutex_lock(&lock); |
| 1819 | list_add_tail(&cma_dev->list, &dev_list); |
| 1820 | list_for_each_entry(id_priv, &listen_any_list, list) |
| 1821 | cma_listen_on_dev(id_priv, cma_dev); |
| 1822 | mutex_unlock(&lock); |
| 1823 | return; |
| 1824 | err: |
| 1825 | kfree(cma_dev); |
| 1826 | } |
| 1827 | |
| 1828 | static int cma_remove_id_dev(struct rdma_id_private *id_priv) |
| 1829 | { |
| 1830 | enum cma_state state; |
| 1831 | |
| 1832 | /* Record that we want to remove the device */ |
| 1833 | state = cma_exch(id_priv, CMA_DEVICE_REMOVAL); |
| 1834 | if (state == CMA_DESTROYING) |
| 1835 | return 0; |
| 1836 | |
| 1837 | cma_cancel_operation(id_priv, state); |
| 1838 | wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove)); |
| 1839 | |
| 1840 | /* Check for destruction from another callback. */ |
| 1841 | if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL)) |
| 1842 | return 0; |
| 1843 | |
| 1844 | return cma_notify_user(id_priv, RDMA_CM_EVENT_DEVICE_REMOVAL, |
| 1845 | 0, NULL, 0); |
| 1846 | } |
| 1847 | |
| 1848 | static void cma_process_remove(struct cma_device *cma_dev) |
| 1849 | { |
| 1850 | struct list_head remove_list; |
| 1851 | struct rdma_id_private *id_priv; |
| 1852 | int ret; |
| 1853 | |
| 1854 | INIT_LIST_HEAD(&remove_list); |
| 1855 | |
| 1856 | mutex_lock(&lock); |
| 1857 | while (!list_empty(&cma_dev->id_list)) { |
| 1858 | id_priv = list_entry(cma_dev->id_list.next, |
| 1859 | struct rdma_id_private, list); |
| 1860 | |
| 1861 | if (cma_internal_listen(id_priv)) { |
| 1862 | cma_destroy_listen(id_priv); |
| 1863 | continue; |
| 1864 | } |
| 1865 | |
| 1866 | list_del(&id_priv->list); |
| 1867 | list_add_tail(&id_priv->list, &remove_list); |
| 1868 | atomic_inc(&id_priv->refcount); |
| 1869 | mutex_unlock(&lock); |
| 1870 | |
| 1871 | ret = cma_remove_id_dev(id_priv); |
| 1872 | cma_deref_id(id_priv); |
| 1873 | if (ret) |
| 1874 | rdma_destroy_id(&id_priv->id); |
| 1875 | |
| 1876 | mutex_lock(&lock); |
| 1877 | } |
| 1878 | mutex_unlock(&lock); |
| 1879 | |
| 1880 | cma_deref_dev(cma_dev); |
| 1881 | wait_for_completion(&cma_dev->comp); |
| 1882 | } |
| 1883 | |
| 1884 | static void cma_remove_one(struct ib_device *device) |
| 1885 | { |
| 1886 | struct cma_device *cma_dev; |
| 1887 | |
| 1888 | cma_dev = ib_get_client_data(device, &cma_client); |
| 1889 | if (!cma_dev) |
| 1890 | return; |
| 1891 | |
| 1892 | mutex_lock(&lock); |
| 1893 | list_del(&cma_dev->list); |
| 1894 | mutex_unlock(&lock); |
| 1895 | |
| 1896 | cma_process_remove(cma_dev); |
| 1897 | kfree(cma_dev); |
| 1898 | } |
| 1899 | |
| 1900 | static int cma_init(void) |
| 1901 | { |
| 1902 | int ret; |
| 1903 | |
| 1904 | cma_wq = create_singlethread_workqueue("rdma_cm_wq"); |
| 1905 | if (!cma_wq) |
| 1906 | return -ENOMEM; |
| 1907 | |
| 1908 | ret = ib_register_client(&cma_client); |
| 1909 | if (ret) |
| 1910 | goto err; |
| 1911 | return 0; |
| 1912 | |
| 1913 | err: |
| 1914 | destroy_workqueue(cma_wq); |
| 1915 | return ret; |
| 1916 | } |
| 1917 | |
| 1918 | static void cma_cleanup(void) |
| 1919 | { |
| 1920 | ib_unregister_client(&cma_client); |
| 1921 | destroy_workqueue(cma_wq); |
| 1922 | idr_destroy(&sdp_ps); |
| 1923 | idr_destroy(&tcp_ps); |
| 1924 | } |
| 1925 | |
| 1926 | module_init(cma_init); |
| 1927 | module_exit(cma_cleanup); |