1 #ifndef _RDS_RDS_H 2 #define _RDS_RDS_H 3 4 #include <net/sock.h> 5 #include <linux/scatterlist.h> 6 #include <linux/highmem.h> 7 #include <rdma/rdma_cm.h> 8 #include <linux/mutex.h> 9 #include <linux/rds.h> 10 11 #include "info.h" 12 13 /* 14 * RDS Network protocol version 15 */ 16 #define RDS_PROTOCOL_3_0 0x0300 17 #define RDS_PROTOCOL_3_1 0x0301 18 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 19 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) 20 #define RDS_PROTOCOL_MINOR(v) ((v) & 255) 21 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) 22 23 /* 24 * XXX randomly chosen, but at least seems to be unused: 25 * # 18464-18768 Unassigned 26 * We should do better. We want a reserved port to discourage unpriv'ed 27 * userspace from listening. 28 */ 29 #define RDS_PORT 18634 30 31 #ifdef DEBUG 32 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 33 #else 34 /* sigh, pr_debug() causes unused variable warnings */ 35 static inline void __attribute__ ((format (printf, 1, 2))) 36 rdsdebug(char *fmt, ...) 37 { 38 } 39 #endif 40 41 /* XXX is there one of these somewhere? */ 42 #define ceil(x, y) \ 43 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 44 45 #define RDS_FRAG_SHIFT 12 46 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 47 48 #define RDS_CONG_MAP_BYTES (65536 / 8) 49 #define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long)) 50 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 51 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 52 53 struct rds_cong_map { 54 struct rb_node m_rb_node; 55 __be32 m_addr; 56 wait_queue_head_t m_waitq; 57 struct list_head m_conn_list; 58 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 59 }; 60 61 62 /* 63 * This is how we will track the connection state: 64 * A connection is always in one of the following 65 * states. Updates to the state are atomic and imply 66 * a memory barrier. 67 */ 68 enum { 69 RDS_CONN_DOWN = 0, 70 RDS_CONN_CONNECTING, 71 RDS_CONN_DISCONNECTING, 72 RDS_CONN_UP, 73 RDS_CONN_ERROR, 74 }; 75 76 /* Bits for c_flags */ 77 #define RDS_LL_SEND_FULL 0 78 #define RDS_RECONNECT_PENDING 1 79 80 struct rds_connection { 81 struct hlist_node c_hash_node; 82 __be32 c_laddr; 83 __be32 c_faddr; 84 unsigned int c_loopback:1; 85 struct rds_connection *c_passive; 86 87 struct rds_cong_map *c_lcong; 88 struct rds_cong_map *c_fcong; 89 90 struct mutex c_send_lock; /* protect send ring */ 91 struct rds_message *c_xmit_rm; 92 unsigned long c_xmit_sg; 93 unsigned int c_xmit_hdr_off; 94 unsigned int c_xmit_data_off; 95 unsigned int c_xmit_rdma_sent; 96 97 spinlock_t c_lock; /* protect msg queues */ 98 u64 c_next_tx_seq; 99 struct list_head c_send_queue; 100 struct list_head c_retrans; 101 102 u64 c_next_rx_seq; 103 104 struct rds_transport *c_trans; 105 void *c_transport_data; 106 107 atomic_t c_state; 108 unsigned long c_flags; 109 unsigned long c_reconnect_jiffies; 110 struct delayed_work c_send_w; 111 struct delayed_work c_recv_w; 112 struct delayed_work c_conn_w; 113 struct work_struct c_down_w; 114 struct mutex c_cm_lock; /* protect conn state & cm */ 115 116 struct list_head c_map_item; 117 unsigned long c_map_queued; 118 unsigned long c_map_offset; 119 unsigned long c_map_bytes; 120 121 unsigned int c_unacked_packets; 122 unsigned int c_unacked_bytes; 123 124 /* Protocol version */ 125 unsigned int c_version; 126 }; 127 128 #define RDS_FLAG_CONG_BITMAP 0x01 129 #define RDS_FLAG_ACK_REQUIRED 0x02 130 #define RDS_FLAG_RETRANSMITTED 0x04 131 #define RDS_MAX_ADV_CREDIT 127 132 133 /* 134 * Maximum space available for extension headers. 135 */ 136 #define RDS_HEADER_EXT_SPACE 16 137 138 struct rds_header { 139 __be64 h_sequence; 140 __be64 h_ack; 141 __be32 h_len; 142 __be16 h_sport; 143 __be16 h_dport; 144 u8 h_flags; 145 u8 h_credit; 146 u8 h_padding[4]; 147 __sum16 h_csum; 148 149 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 150 }; 151 152 /* 153 * Reserved - indicates end of extensions 154 */ 155 #define RDS_EXTHDR_NONE 0 156 157 /* 158 * This extension header is included in the very 159 * first message that is sent on a new connection, 160 * and identifies the protocol level. This will help 161 * rolling updates if a future change requires breaking 162 * the protocol. 163 * NB: This is no longer true for IB, where we do a version 164 * negotiation during the connection setup phase (protocol 165 * version information is included in the RDMA CM private data). 166 */ 167 #define RDS_EXTHDR_VERSION 1 168 struct rds_ext_header_version { 169 __be32 h_version; 170 }; 171 172 /* 173 * This extension header is included in the RDS message 174 * chasing an RDMA operation. 175 */ 176 #define RDS_EXTHDR_RDMA 2 177 struct rds_ext_header_rdma { 178 __be32 h_rdma_rkey; 179 }; 180 181 /* 182 * This extension header tells the peer about the 183 * destination <R_Key,offset> of the requested RDMA 184 * operation. 185 */ 186 #define RDS_EXTHDR_RDMA_DEST 3 187 struct rds_ext_header_rdma_dest { 188 __be32 h_rdma_rkey; 189 __be32 h_rdma_offset; 190 }; 191 192 #define __RDS_EXTHDR_MAX 16 /* for now */ 193 194 struct rds_incoming { 195 atomic_t i_refcount; 196 struct list_head i_item; 197 struct rds_connection *i_conn; 198 struct rds_header i_hdr; 199 unsigned long i_rx_jiffies; 200 __be32 i_saddr; 201 202 rds_rdma_cookie_t i_rdma_cookie; 203 }; 204 205 /* 206 * m_sock_item and m_conn_item are on lists that are serialized under 207 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 208 * the message will not be put back on the retransmit list after being sent. 209 * messages that are canceled while being sent rely on this. 210 * 211 * m_inc is used by loopback so that it can pass an incoming message straight 212 * back up into the rx path. It embeds a wire header which is also used by 213 * the send path, which is kind of awkward. 214 * 215 * m_sock_item indicates the message's presence on a socket's send or receive 216 * queue. m_rs will point to that socket. 217 * 218 * m_daddr is used by cancellation to prune messages to a given destination. 219 * 220 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 221 * nesting. As paths iterate over messages on a sock, or conn, they must 222 * also lock the conn, or sock, to remove the message from those lists too. 223 * Testing the flag to determine if the message is still on the lists lets 224 * us avoid testing the list_head directly. That means each path can use 225 * the message's list_head to keep it on a local list while juggling locks 226 * without confusing the other path. 227 * 228 * m_ack_seq is an optional field set by transports who need a different 229 * sequence number range to invalidate. They can use this in a callback 230 * that they pass to rds_send_drop_acked() to see if each message has been 231 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 232 * had ack_seq set yet. 233 */ 234 #define RDS_MSG_ON_SOCK 1 235 #define RDS_MSG_ON_CONN 2 236 #define RDS_MSG_HAS_ACK_SEQ 3 237 #define RDS_MSG_ACK_REQUIRED 4 238 #define RDS_MSG_RETRANSMITTED 5 239 #define RDS_MSG_MAPPED 6 240 #define RDS_MSG_PAGEVEC 7 241 242 struct rds_message { 243 atomic_t m_refcount; 244 struct list_head m_sock_item; 245 struct list_head m_conn_item; 246 struct rds_incoming m_inc; 247 u64 m_ack_seq; 248 __be32 m_daddr; 249 unsigned long m_flags; 250 251 /* Never access m_rs without holding m_rs_lock. 252 * Lock nesting is 253 * rm->m_rs_lock 254 * -> rs->rs_lock 255 */ 256 spinlock_t m_rs_lock; 257 struct rds_sock *m_rs; 258 struct rds_rdma_op *m_rdma_op; 259 rds_rdma_cookie_t m_rdma_cookie; 260 struct rds_mr *m_rdma_mr; 261 unsigned int m_nents; 262 unsigned int m_count; 263 struct scatterlist m_sg[0]; 264 }; 265 266 /* 267 * The RDS notifier is used (optionally) to tell the application about 268 * completed RDMA operations. Rather than keeping the whole rds message 269 * around on the queue, we allocate a small notifier that is put on the 270 * socket's notifier_list. Notifications are delivered to the application 271 * through control messages. 272 */ 273 struct rds_notifier { 274 struct list_head n_list; 275 uint64_t n_user_token; 276 int n_status; 277 }; 278 279 /** 280 * struct rds_transport - transport specific behavioural hooks 281 * 282 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 283 * part of a message. The caller serializes on the send_sem so this 284 * doesn't need to be reentrant for a given conn. The header must be 285 * sent before the data payload. .xmit must be prepared to send a 286 * message with no data payload. .xmit should return the number of 287 * bytes that were sent down the connection, including header bytes. 288 * Returning 0 tells the caller that it doesn't need to perform any 289 * additional work now. This is usually the case when the transport has 290 * filled the sending queue for its connection and will handle 291 * triggering the rds thread to continue the send when space becomes 292 * available. Returning -EAGAIN tells the caller to retry the send 293 * immediately. Returning -ENOMEM tells the caller to retry the send at 294 * some point in the future. 295 * 296 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 297 * it returns the connection can not call rds_recv_incoming(). 298 * This will only be called once after conn_connect returns 299 * non-zero success and will The caller serializes this with 300 * the send and connecting paths (xmit_* and conn_*). The 301 * transport is responsible for other serialization, including 302 * rds_recv_incoming(). This is called in process context but 303 * should try hard not to block. 304 * 305 * @xmit_cong_map: This asks the transport to send the local bitmap down the 306 * given connection. XXX get a better story about the bitmap 307 * flag and header. 308 */ 309 310 struct rds_transport { 311 char t_name[TRANSNAMSIZ]; 312 struct list_head t_item; 313 struct module *t_owner; 314 unsigned int t_prefer_loopback:1; 315 316 int (*laddr_check)(__be32 addr); 317 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 318 void (*conn_free)(void *data); 319 int (*conn_connect)(struct rds_connection *conn); 320 void (*conn_shutdown)(struct rds_connection *conn); 321 void (*xmit_prepare)(struct rds_connection *conn); 322 void (*xmit_complete)(struct rds_connection *conn); 323 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 324 unsigned int hdr_off, unsigned int sg, unsigned int off); 325 int (*xmit_cong_map)(struct rds_connection *conn, 326 struct rds_cong_map *map, unsigned long offset); 327 int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op); 328 int (*recv)(struct rds_connection *conn); 329 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov, 330 size_t size); 331 void (*inc_purge)(struct rds_incoming *inc); 332 void (*inc_free)(struct rds_incoming *inc); 333 334 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 335 struct rdma_cm_event *event); 336 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 337 void (*cm_connect_complete)(struct rds_connection *conn, 338 struct rdma_cm_event *event); 339 340 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 341 unsigned int avail); 342 void (*exit)(void); 343 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 344 struct rds_sock *rs, u32 *key_ret); 345 void (*sync_mr)(void *trans_private, int direction); 346 void (*free_mr)(void *trans_private, int invalidate); 347 void (*flush_mrs)(void); 348 }; 349 350 struct rds_sock { 351 struct sock rs_sk; 352 353 u64 rs_user_addr; 354 u64 rs_user_bytes; 355 356 /* 357 * bound_addr used for both incoming and outgoing, no INADDR_ANY 358 * support. 359 */ 360 struct rb_node rs_bound_node; 361 __be32 rs_bound_addr; 362 __be32 rs_conn_addr; 363 __be16 rs_bound_port; 364 __be16 rs_conn_port; 365 366 /* 367 * This is only used to communicate the transport between bind and 368 * initiating connections. All other trans use is referenced through 369 * the connection. 370 */ 371 struct rds_transport *rs_transport; 372 373 /* 374 * rds_sendmsg caches the conn it used the last time around. 375 * This helps avoid costly lookups. 376 */ 377 struct rds_connection *rs_conn; 378 379 /* flag indicating we were congested or not */ 380 int rs_congested; 381 382 /* rs_lock protects all these adjacent members before the newline */ 383 spinlock_t rs_lock; 384 struct list_head rs_send_queue; 385 u32 rs_snd_bytes; 386 int rs_rcv_bytes; 387 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 388 389 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 390 * to decide whether the application should be woken up. 391 * If not set, we use rs_cong_track to find out whether a cong map 392 * update arrived. 393 */ 394 uint64_t rs_cong_mask; 395 uint64_t rs_cong_notify; 396 struct list_head rs_cong_list; 397 unsigned long rs_cong_track; 398 399 /* 400 * rs_recv_lock protects the receive queue, and is 401 * used to serialize with rds_release. 402 */ 403 rwlock_t rs_recv_lock; 404 struct list_head rs_recv_queue; 405 406 /* just for stats reporting */ 407 struct list_head rs_item; 408 409 /* these have their own lock */ 410 spinlock_t rs_rdma_lock; 411 struct rb_root rs_rdma_keys; 412 413 /* Socket options - in case there will be more */ 414 unsigned char rs_recverr, 415 rs_cong_monitor; 416 }; 417 418 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 419 { 420 return container_of(sk, struct rds_sock, rs_sk); 421 } 422 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 423 { 424 return &rs->rs_sk; 425 } 426 427 /* 428 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 429 * to account for overhead. We don't account for overhead, we just apply 430 * the number of payload bytes to the specified value. 431 */ 432 static inline int rds_sk_sndbuf(struct rds_sock *rs) 433 { 434 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 435 } 436 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 437 { 438 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 439 } 440 441 struct rds_statistics { 442 uint64_t s_conn_reset; 443 uint64_t s_recv_drop_bad_checksum; 444 uint64_t s_recv_drop_old_seq; 445 uint64_t s_recv_drop_no_sock; 446 uint64_t s_recv_drop_dead_sock; 447 uint64_t s_recv_deliver_raced; 448 uint64_t s_recv_delivered; 449 uint64_t s_recv_queued; 450 uint64_t s_recv_immediate_retry; 451 uint64_t s_recv_delayed_retry; 452 uint64_t s_recv_ack_required; 453 uint64_t s_recv_rdma_bytes; 454 uint64_t s_recv_ping; 455 uint64_t s_send_queue_empty; 456 uint64_t s_send_queue_full; 457 uint64_t s_send_sem_contention; 458 uint64_t s_send_sem_queue_raced; 459 uint64_t s_send_immediate_retry; 460 uint64_t s_send_delayed_retry; 461 uint64_t s_send_drop_acked; 462 uint64_t s_send_ack_required; 463 uint64_t s_send_queued; 464 uint64_t s_send_rdma; 465 uint64_t s_send_rdma_bytes; 466 uint64_t s_send_pong; 467 uint64_t s_page_remainder_hit; 468 uint64_t s_page_remainder_miss; 469 uint64_t s_copy_to_user; 470 uint64_t s_copy_from_user; 471 uint64_t s_cong_update_queued; 472 uint64_t s_cong_update_received; 473 uint64_t s_cong_send_error; 474 uint64_t s_cong_send_blocked; 475 }; 476 477 /* af_rds.c */ 478 void rds_sock_addref(struct rds_sock *rs); 479 void rds_sock_put(struct rds_sock *rs); 480 void rds_wake_sk_sleep(struct rds_sock *rs); 481 static inline void __rds_wake_sk_sleep(struct sock *sk) 482 { 483 wait_queue_head_t *waitq = sk->sk_sleep; 484 485 if (!sock_flag(sk, SOCK_DEAD) && waitq) 486 wake_up(waitq); 487 } 488 extern wait_queue_head_t rds_poll_waitq; 489 490 491 /* bind.c */ 492 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 493 void rds_remove_bound(struct rds_sock *rs); 494 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 495 496 /* cong.c */ 497 int rds_cong_get_maps(struct rds_connection *conn); 498 void rds_cong_add_conn(struct rds_connection *conn); 499 void rds_cong_remove_conn(struct rds_connection *conn); 500 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 501 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 502 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 503 void rds_cong_queue_updates(struct rds_cong_map *map); 504 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 505 int rds_cong_updated_since(unsigned long *recent); 506 void rds_cong_add_socket(struct rds_sock *); 507 void rds_cong_remove_socket(struct rds_sock *); 508 void rds_cong_exit(void); 509 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 510 511 /* conn.c */ 512 int __init rds_conn_init(void); 513 void rds_conn_exit(void); 514 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 515 struct rds_transport *trans, gfp_t gfp); 516 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 517 struct rds_transport *trans, gfp_t gfp); 518 void rds_conn_destroy(struct rds_connection *conn); 519 void rds_conn_reset(struct rds_connection *conn); 520 void rds_conn_drop(struct rds_connection *conn); 521 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 522 struct rds_info_iterator *iter, 523 struct rds_info_lengths *lens, 524 int (*visitor)(struct rds_connection *, void *), 525 size_t item_len); 526 void __rds_conn_error(struct rds_connection *conn, const char *, ...) 527 __attribute__ ((format (printf, 2, 3))); 528 #define rds_conn_error(conn, fmt...) \ 529 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 530 531 static inline int 532 rds_conn_transition(struct rds_connection *conn, int old, int new) 533 { 534 return atomic_cmpxchg(&conn->c_state, old, new) == old; 535 } 536 537 static inline int 538 rds_conn_state(struct rds_connection *conn) 539 { 540 return atomic_read(&conn->c_state); 541 } 542 543 static inline int 544 rds_conn_up(struct rds_connection *conn) 545 { 546 return atomic_read(&conn->c_state) == RDS_CONN_UP; 547 } 548 549 static inline int 550 rds_conn_connecting(struct rds_connection *conn) 551 { 552 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 553 } 554 555 /* message.c */ 556 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 557 struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, 558 size_t total_len); 559 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 560 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 561 __be16 dport, u64 seq); 562 int rds_message_add_extension(struct rds_header *hdr, 563 unsigned int type, const void *data, unsigned int len); 564 int rds_message_next_extension(struct rds_header *hdr, 565 unsigned int *pos, void *buf, unsigned int *buflen); 566 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version); 567 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version); 568 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 569 int rds_message_inc_copy_to_user(struct rds_incoming *inc, 570 struct iovec *first_iov, size_t size); 571 void rds_message_inc_purge(struct rds_incoming *inc); 572 void rds_message_inc_free(struct rds_incoming *inc); 573 void rds_message_addref(struct rds_message *rm); 574 void rds_message_put(struct rds_message *rm); 575 void rds_message_wait(struct rds_message *rm); 576 void rds_message_unmapped(struct rds_message *rm); 577 578 static inline void rds_message_make_checksum(struct rds_header *hdr) 579 { 580 hdr->h_csum = 0; 581 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 582 } 583 584 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 585 { 586 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 587 } 588 589 590 /* page.c */ 591 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 592 gfp_t gfp); 593 int rds_page_copy_user(struct page *page, unsigned long offset, 594 void __user *ptr, unsigned long bytes, 595 int to_user); 596 #define rds_page_copy_to_user(page, offset, ptr, bytes) \ 597 rds_page_copy_user(page, offset, ptr, bytes, 1) 598 #define rds_page_copy_from_user(page, offset, ptr, bytes) \ 599 rds_page_copy_user(page, offset, ptr, bytes, 0) 600 void rds_page_exit(void); 601 602 /* recv.c */ 603 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 604 __be32 saddr); 605 void rds_inc_addref(struct rds_incoming *inc); 606 void rds_inc_put(struct rds_incoming *inc); 607 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 608 struct rds_incoming *inc, gfp_t gfp, enum km_type km); 609 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 610 size_t size, int msg_flags); 611 void rds_clear_recv_queue(struct rds_sock *rs); 612 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 613 void rds_inc_info_copy(struct rds_incoming *inc, 614 struct rds_info_iterator *iter, 615 __be32 saddr, __be32 daddr, int flip); 616 617 /* send.c */ 618 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 619 size_t payload_len); 620 void rds_send_reset(struct rds_connection *conn); 621 int rds_send_xmit(struct rds_connection *conn); 622 struct sockaddr_in; 623 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 624 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 625 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 626 is_acked_func is_acked); 627 int rds_send_acked_before(struct rds_connection *conn, u64 seq); 628 void rds_send_remove_from_sock(struct list_head *messages, int status); 629 int rds_send_pong(struct rds_connection *conn, __be16 dport); 630 struct rds_message *rds_send_get_message(struct rds_connection *, 631 struct rds_rdma_op *); 632 633 /* rdma.c */ 634 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 635 636 /* stats.c */ 637 DECLARE_PER_CPU(struct rds_statistics, rds_stats); 638 #define rds_stats_inc_which(which, member) do { \ 639 per_cpu(which, get_cpu()).member++; \ 640 put_cpu(); \ 641 } while (0) 642 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 643 #define rds_stats_add_which(which, member, count) do { \ 644 per_cpu(which, get_cpu()).member += count; \ 645 put_cpu(); \ 646 } while (0) 647 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 648 int __init rds_stats_init(void); 649 void rds_stats_exit(void); 650 void rds_stats_info_copy(struct rds_info_iterator *iter, 651 uint64_t *values, char **names, size_t nr); 652 653 /* sysctl.c */ 654 int __init rds_sysctl_init(void); 655 void rds_sysctl_exit(void); 656 extern unsigned long rds_sysctl_sndbuf_min; 657 extern unsigned long rds_sysctl_sndbuf_default; 658 extern unsigned long rds_sysctl_sndbuf_max; 659 extern unsigned long rds_sysctl_reconnect_min_jiffies; 660 extern unsigned long rds_sysctl_reconnect_max_jiffies; 661 extern unsigned int rds_sysctl_max_unacked_packets; 662 extern unsigned int rds_sysctl_max_unacked_bytes; 663 extern unsigned int rds_sysctl_ping_enable; 664 extern unsigned long rds_sysctl_trace_flags; 665 extern unsigned int rds_sysctl_trace_level; 666 667 /* threads.c */ 668 int __init rds_threads_init(void); 669 void rds_threads_exit(void); 670 extern struct workqueue_struct *rds_wq; 671 void rds_connect_worker(struct work_struct *); 672 void rds_shutdown_worker(struct work_struct *); 673 void rds_send_worker(struct work_struct *); 674 void rds_recv_worker(struct work_struct *); 675 void rds_connect_complete(struct rds_connection *conn); 676 677 /* transport.c */ 678 int rds_trans_register(struct rds_transport *trans); 679 void rds_trans_unregister(struct rds_transport *trans); 680 struct rds_transport *rds_trans_get_preferred(__be32 addr); 681 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 682 unsigned int avail); 683 int __init rds_trans_init(void); 684 void rds_trans_exit(void); 685 686 #endif 687