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 ATOMIC64_INIT 32 #define KERNEL_HAS_ATOMIC64 33 #endif 34 35 #ifdef DEBUG 36 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 37 #else 38 /* sigh, pr_debug() causes unused variable warnings */ 39 static inline void __attribute__ ((format (printf, 1, 2))) 40 rdsdebug(char *fmt, ...) 41 { 42 } 43 #endif 44 45 /* XXX is there one of these somewhere? */ 46 #define ceil(x, y) \ 47 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 48 49 #define RDS_FRAG_SHIFT 12 50 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 51 52 #define RDS_CONG_MAP_BYTES (65536 / 8) 53 #define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long)) 54 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 55 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 56 57 struct rds_cong_map { 58 struct rb_node m_rb_node; 59 __be32 m_addr; 60 wait_queue_head_t m_waitq; 61 struct list_head m_conn_list; 62 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 63 }; 64 65 66 /* 67 * This is how we will track the connection state: 68 * A connection is always in one of the following 69 * states. Updates to the state are atomic and imply 70 * a memory barrier. 71 */ 72 enum { 73 RDS_CONN_DOWN = 0, 74 RDS_CONN_CONNECTING, 75 RDS_CONN_DISCONNECTING, 76 RDS_CONN_UP, 77 RDS_CONN_ERROR, 78 }; 79 80 /* Bits for c_flags */ 81 #define RDS_LL_SEND_FULL 0 82 #define RDS_RECONNECT_PENDING 1 83 84 struct rds_connection { 85 struct hlist_node c_hash_node; 86 __be32 c_laddr; 87 __be32 c_faddr; 88 unsigned int c_loopback:1; 89 struct rds_connection *c_passive; 90 91 struct rds_cong_map *c_lcong; 92 struct rds_cong_map *c_fcong; 93 94 struct mutex c_send_lock; /* protect send ring */ 95 struct rds_message *c_xmit_rm; 96 unsigned long c_xmit_sg; 97 unsigned int c_xmit_hdr_off; 98 unsigned int c_xmit_data_off; 99 unsigned int c_xmit_rdma_sent; 100 101 spinlock_t c_lock; /* protect msg queues */ 102 u64 c_next_tx_seq; 103 struct list_head c_send_queue; 104 struct list_head c_retrans; 105 106 u64 c_next_rx_seq; 107 108 struct rds_transport *c_trans; 109 void *c_transport_data; 110 111 atomic_t c_state; 112 unsigned long c_flags; 113 unsigned long c_reconnect_jiffies; 114 struct delayed_work c_send_w; 115 struct delayed_work c_recv_w; 116 struct delayed_work c_conn_w; 117 struct work_struct c_down_w; 118 struct mutex c_cm_lock; /* protect conn state & cm */ 119 120 struct list_head c_map_item; 121 unsigned long c_map_queued; 122 unsigned long c_map_offset; 123 unsigned long c_map_bytes; 124 125 unsigned int c_unacked_packets; 126 unsigned int c_unacked_bytes; 127 128 /* Protocol version */ 129 unsigned int c_version; 130 }; 131 132 #define RDS_FLAG_CONG_BITMAP 0x01 133 #define RDS_FLAG_ACK_REQUIRED 0x02 134 #define RDS_FLAG_RETRANSMITTED 0x04 135 #define RDS_MAX_ADV_CREDIT 127 136 137 /* 138 * Maximum space available for extension headers. 139 */ 140 #define RDS_HEADER_EXT_SPACE 16 141 142 struct rds_header { 143 __be64 h_sequence; 144 __be64 h_ack; 145 __be32 h_len; 146 __be16 h_sport; 147 __be16 h_dport; 148 u8 h_flags; 149 u8 h_credit; 150 u8 h_padding[4]; 151 __sum16 h_csum; 152 153 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 154 }; 155 156 /* 157 * Reserved - indicates end of extensions 158 */ 159 #define RDS_EXTHDR_NONE 0 160 161 /* 162 * This extension header is included in the very 163 * first message that is sent on a new connection, 164 * and identifies the protocol level. This will help 165 * rolling updates if a future change requires breaking 166 * the protocol. 167 * NB: This is no longer true for IB, where we do a version 168 * negotiation during the connection setup phase (protocol 169 * version information is included in the RDMA CM private data). 170 */ 171 #define RDS_EXTHDR_VERSION 1 172 struct rds_ext_header_version { 173 __be32 h_version; 174 }; 175 176 /* 177 * This extension header is included in the RDS message 178 * chasing an RDMA operation. 179 */ 180 #define RDS_EXTHDR_RDMA 2 181 struct rds_ext_header_rdma { 182 __be32 h_rdma_rkey; 183 }; 184 185 /* 186 * This extension header tells the peer about the 187 * destination <R_Key,offset> of the requested RDMA 188 * operation. 189 */ 190 #define RDS_EXTHDR_RDMA_DEST 3 191 struct rds_ext_header_rdma_dest { 192 __be32 h_rdma_rkey; 193 __be32 h_rdma_offset; 194 }; 195 196 #define __RDS_EXTHDR_MAX 16 /* for now */ 197 198 struct rds_incoming { 199 atomic_t i_refcount; 200 struct list_head i_item; 201 struct rds_connection *i_conn; 202 struct rds_header i_hdr; 203 unsigned long i_rx_jiffies; 204 __be32 i_saddr; 205 206 rds_rdma_cookie_t i_rdma_cookie; 207 }; 208 209 /* 210 * m_sock_item and m_conn_item are on lists that are serialized under 211 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 212 * the message will not be put back on the retransmit list after being sent. 213 * messages that are canceled while being sent rely on this. 214 * 215 * m_inc is used by loopback so that it can pass an incoming message straight 216 * back up into the rx path. It embeds a wire header which is also used by 217 * the send path, which is kind of awkward. 218 * 219 * m_sock_item indicates the message's presence on a socket's send or receive 220 * queue. m_rs will point to that socket. 221 * 222 * m_daddr is used by cancellation to prune messages to a given destination. 223 * 224 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 225 * nesting. As paths iterate over messages on a sock, or conn, they must 226 * also lock the conn, or sock, to remove the message from those lists too. 227 * Testing the flag to determine if the message is still on the lists lets 228 * us avoid testing the list_head directly. That means each path can use 229 * the message's list_head to keep it on a local list while juggling locks 230 * without confusing the other path. 231 * 232 * m_ack_seq is an optional field set by transports who need a different 233 * sequence number range to invalidate. They can use this in a callback 234 * that they pass to rds_send_drop_acked() to see if each message has been 235 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 236 * had ack_seq set yet. 237 */ 238 #define RDS_MSG_ON_SOCK 1 239 #define RDS_MSG_ON_CONN 2 240 #define RDS_MSG_HAS_ACK_SEQ 3 241 #define RDS_MSG_ACK_REQUIRED 4 242 #define RDS_MSG_RETRANSMITTED 5 243 #define RDS_MSG_MAPPED 6 244 #define RDS_MSG_PAGEVEC 7 245 246 struct rds_message { 247 atomic_t m_refcount; 248 struct list_head m_sock_item; 249 struct list_head m_conn_item; 250 struct rds_incoming m_inc; 251 u64 m_ack_seq; 252 __be32 m_daddr; 253 unsigned long m_flags; 254 255 /* Never access m_rs without holding m_rs_lock. 256 * Lock nesting is 257 * rm->m_rs_lock 258 * -> rs->rs_lock 259 */ 260 spinlock_t m_rs_lock; 261 struct rds_sock *m_rs; 262 struct rds_rdma_op *m_rdma_op; 263 rds_rdma_cookie_t m_rdma_cookie; 264 struct rds_mr *m_rdma_mr; 265 unsigned int m_nents; 266 unsigned int m_count; 267 struct scatterlist m_sg[0]; 268 }; 269 270 /* 271 * The RDS notifier is used (optionally) to tell the application about 272 * completed RDMA operations. Rather than keeping the whole rds message 273 * around on the queue, we allocate a small notifier that is put on the 274 * socket's notifier_list. Notifications are delivered to the application 275 * through control messages. 276 */ 277 struct rds_notifier { 278 struct list_head n_list; 279 uint64_t n_user_token; 280 int n_status; 281 }; 282 283 /** 284 * struct rds_transport - transport specific behavioural hooks 285 * 286 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 287 * part of a message. The caller serializes on the send_sem so this 288 * doesn't need to be reentrant for a given conn. The header must be 289 * sent before the data payload. .xmit must be prepared to send a 290 * message with no data payload. .xmit should return the number of 291 * bytes that were sent down the connection, including header bytes. 292 * Returning 0 tells the caller that it doesn't need to perform any 293 * additional work now. This is usually the case when the transport has 294 * filled the sending queue for its connection and will handle 295 * triggering the rds thread to continue the send when space becomes 296 * available. Returning -EAGAIN tells the caller to retry the send 297 * immediately. Returning -ENOMEM tells the caller to retry the send at 298 * some point in the future. 299 * 300 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 301 * it returns the connection can not call rds_recv_incoming(). 302 * This will only be called once after conn_connect returns 303 * non-zero success and will The caller serializes this with 304 * the send and connecting paths (xmit_* and conn_*). The 305 * transport is responsible for other serialization, including 306 * rds_recv_incoming(). This is called in process context but 307 * should try hard not to block. 308 * 309 * @xmit_cong_map: This asks the transport to send the local bitmap down the 310 * given connection. XXX get a better story about the bitmap 311 * flag and header. 312 */ 313 314 struct rds_transport { 315 char t_name[TRANSNAMSIZ]; 316 struct list_head t_item; 317 struct module *t_owner; 318 unsigned int t_prefer_loopback:1; 319 320 int (*laddr_check)(__be32 addr); 321 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 322 void (*conn_free)(void *data); 323 int (*conn_connect)(struct rds_connection *conn); 324 void (*conn_shutdown)(struct rds_connection *conn); 325 void (*xmit_prepare)(struct rds_connection *conn); 326 void (*xmit_complete)(struct rds_connection *conn); 327 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 328 unsigned int hdr_off, unsigned int sg, unsigned int off); 329 int (*xmit_cong_map)(struct rds_connection *conn, 330 struct rds_cong_map *map, unsigned long offset); 331 int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op); 332 int (*recv)(struct rds_connection *conn); 333 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov, 334 size_t size); 335 void (*inc_purge)(struct rds_incoming *inc); 336 void (*inc_free)(struct rds_incoming *inc); 337 338 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 339 struct rdma_cm_event *event); 340 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 341 void (*cm_connect_complete)(struct rds_connection *conn, 342 struct rdma_cm_event *event); 343 344 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 345 unsigned int avail); 346 void (*exit)(void); 347 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 348 struct rds_sock *rs, u32 *key_ret); 349 void (*sync_mr)(void *trans_private, int direction); 350 void (*free_mr)(void *trans_private, int invalidate); 351 void (*flush_mrs)(void); 352 }; 353 354 struct rds_sock { 355 struct sock rs_sk; 356 357 u64 rs_user_addr; 358 u64 rs_user_bytes; 359 360 /* 361 * bound_addr used for both incoming and outgoing, no INADDR_ANY 362 * support. 363 */ 364 struct rb_node rs_bound_node; 365 __be32 rs_bound_addr; 366 __be32 rs_conn_addr; 367 __be16 rs_bound_port; 368 __be16 rs_conn_port; 369 370 /* 371 * This is only used to communicate the transport between bind and 372 * initiating connections. All other trans use is referenced through 373 * the connection. 374 */ 375 struct rds_transport *rs_transport; 376 377 /* 378 * rds_sendmsg caches the conn it used the last time around. 379 * This helps avoid costly lookups. 380 */ 381 struct rds_connection *rs_conn; 382 383 /* flag indicating we were congested or not */ 384 int rs_congested; 385 386 /* rs_lock protects all these adjacent members before the newline */ 387 spinlock_t rs_lock; 388 struct list_head rs_send_queue; 389 u32 rs_snd_bytes; 390 int rs_rcv_bytes; 391 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 392 393 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 394 * to decide whether the application should be woken up. 395 * If not set, we use rs_cong_track to find out whether a cong map 396 * update arrived. 397 */ 398 uint64_t rs_cong_mask; 399 uint64_t rs_cong_notify; 400 struct list_head rs_cong_list; 401 unsigned long rs_cong_track; 402 403 /* 404 * rs_recv_lock protects the receive queue, and is 405 * used to serialize with rds_release. 406 */ 407 rwlock_t rs_recv_lock; 408 struct list_head rs_recv_queue; 409 410 /* just for stats reporting */ 411 struct list_head rs_item; 412 413 /* these have their own lock */ 414 spinlock_t rs_rdma_lock; 415 struct rb_root rs_rdma_keys; 416 417 /* Socket options - in case there will be more */ 418 unsigned char rs_recverr, 419 rs_cong_monitor; 420 }; 421 422 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 423 { 424 return container_of(sk, struct rds_sock, rs_sk); 425 } 426 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 427 { 428 return &rs->rs_sk; 429 } 430 431 /* 432 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 433 * to account for overhead. We don't account for overhead, we just apply 434 * the number of payload bytes to the specified value. 435 */ 436 static inline int rds_sk_sndbuf(struct rds_sock *rs) 437 { 438 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 439 } 440 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 441 { 442 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 443 } 444 445 struct rds_statistics { 446 uint64_t s_conn_reset; 447 uint64_t s_recv_drop_bad_checksum; 448 uint64_t s_recv_drop_old_seq; 449 uint64_t s_recv_drop_no_sock; 450 uint64_t s_recv_drop_dead_sock; 451 uint64_t s_recv_deliver_raced; 452 uint64_t s_recv_delivered; 453 uint64_t s_recv_queued; 454 uint64_t s_recv_immediate_retry; 455 uint64_t s_recv_delayed_retry; 456 uint64_t s_recv_ack_required; 457 uint64_t s_recv_rdma_bytes; 458 uint64_t s_recv_ping; 459 uint64_t s_send_queue_empty; 460 uint64_t s_send_queue_full; 461 uint64_t s_send_sem_contention; 462 uint64_t s_send_sem_queue_raced; 463 uint64_t s_send_immediate_retry; 464 uint64_t s_send_delayed_retry; 465 uint64_t s_send_drop_acked; 466 uint64_t s_send_ack_required; 467 uint64_t s_send_queued; 468 uint64_t s_send_rdma; 469 uint64_t s_send_rdma_bytes; 470 uint64_t s_send_pong; 471 uint64_t s_page_remainder_hit; 472 uint64_t s_page_remainder_miss; 473 uint64_t s_copy_to_user; 474 uint64_t s_copy_from_user; 475 uint64_t s_cong_update_queued; 476 uint64_t s_cong_update_received; 477 uint64_t s_cong_send_error; 478 uint64_t s_cong_send_blocked; 479 }; 480 481 /* af_rds.c */ 482 void rds_sock_addref(struct rds_sock *rs); 483 void rds_sock_put(struct rds_sock *rs); 484 void rds_wake_sk_sleep(struct rds_sock *rs); 485 static inline void __rds_wake_sk_sleep(struct sock *sk) 486 { 487 wait_queue_head_t *waitq = sk->sk_sleep; 488 489 if (!sock_flag(sk, SOCK_DEAD) && waitq) 490 wake_up(waitq); 491 } 492 extern wait_queue_head_t rds_poll_waitq; 493 494 495 /* bind.c */ 496 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 497 void rds_remove_bound(struct rds_sock *rs); 498 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 499 500 /* cong.c */ 501 int rds_cong_get_maps(struct rds_connection *conn); 502 void rds_cong_add_conn(struct rds_connection *conn); 503 void rds_cong_remove_conn(struct rds_connection *conn); 504 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 505 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 506 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 507 void rds_cong_queue_updates(struct rds_cong_map *map); 508 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 509 int rds_cong_updated_since(unsigned long *recent); 510 void rds_cong_add_socket(struct rds_sock *); 511 void rds_cong_remove_socket(struct rds_sock *); 512 void rds_cong_exit(void); 513 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 514 515 /* conn.c */ 516 int __init rds_conn_init(void); 517 void rds_conn_exit(void); 518 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 519 struct rds_transport *trans, gfp_t gfp); 520 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 521 struct rds_transport *trans, gfp_t gfp); 522 void rds_conn_destroy(struct rds_connection *conn); 523 void rds_conn_reset(struct rds_connection *conn); 524 void rds_conn_drop(struct rds_connection *conn); 525 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 526 struct rds_info_iterator *iter, 527 struct rds_info_lengths *lens, 528 int (*visitor)(struct rds_connection *, void *), 529 size_t item_len); 530 void __rds_conn_error(struct rds_connection *conn, const char *, ...) 531 __attribute__ ((format (printf, 2, 3))); 532 #define rds_conn_error(conn, fmt...) \ 533 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 534 535 static inline int 536 rds_conn_transition(struct rds_connection *conn, int old, int new) 537 { 538 return atomic_cmpxchg(&conn->c_state, old, new) == old; 539 } 540 541 static inline int 542 rds_conn_state(struct rds_connection *conn) 543 { 544 return atomic_read(&conn->c_state); 545 } 546 547 static inline int 548 rds_conn_up(struct rds_connection *conn) 549 { 550 return atomic_read(&conn->c_state) == RDS_CONN_UP; 551 } 552 553 static inline int 554 rds_conn_connecting(struct rds_connection *conn) 555 { 556 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 557 } 558 559 /* message.c */ 560 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 561 struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, 562 size_t total_len); 563 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 564 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 565 __be16 dport, u64 seq); 566 int rds_message_add_extension(struct rds_header *hdr, 567 unsigned int type, const void *data, unsigned int len); 568 int rds_message_next_extension(struct rds_header *hdr, 569 unsigned int *pos, void *buf, unsigned int *buflen); 570 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version); 571 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version); 572 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 573 int rds_message_inc_copy_to_user(struct rds_incoming *inc, 574 struct iovec *first_iov, size_t size); 575 void rds_message_inc_purge(struct rds_incoming *inc); 576 void rds_message_inc_free(struct rds_incoming *inc); 577 void rds_message_addref(struct rds_message *rm); 578 void rds_message_put(struct rds_message *rm); 579 void rds_message_wait(struct rds_message *rm); 580 void rds_message_unmapped(struct rds_message *rm); 581 582 static inline void rds_message_make_checksum(struct rds_header *hdr) 583 { 584 hdr->h_csum = 0; 585 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 586 } 587 588 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 589 { 590 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 591 } 592 593 594 /* page.c */ 595 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 596 gfp_t gfp); 597 int rds_page_copy_user(struct page *page, unsigned long offset, 598 void __user *ptr, unsigned long bytes, 599 int to_user); 600 #define rds_page_copy_to_user(page, offset, ptr, bytes) \ 601 rds_page_copy_user(page, offset, ptr, bytes, 1) 602 #define rds_page_copy_from_user(page, offset, ptr, bytes) \ 603 rds_page_copy_user(page, offset, ptr, bytes, 0) 604 void rds_page_exit(void); 605 606 /* recv.c */ 607 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 608 __be32 saddr); 609 void rds_inc_addref(struct rds_incoming *inc); 610 void rds_inc_put(struct rds_incoming *inc); 611 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 612 struct rds_incoming *inc, gfp_t gfp, enum km_type km); 613 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 614 size_t size, int msg_flags); 615 void rds_clear_recv_queue(struct rds_sock *rs); 616 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 617 void rds_inc_info_copy(struct rds_incoming *inc, 618 struct rds_info_iterator *iter, 619 __be32 saddr, __be32 daddr, int flip); 620 621 /* send.c */ 622 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 623 size_t payload_len); 624 void rds_send_reset(struct rds_connection *conn); 625 int rds_send_xmit(struct rds_connection *conn); 626 struct sockaddr_in; 627 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 628 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 629 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 630 is_acked_func is_acked); 631 int rds_send_acked_before(struct rds_connection *conn, u64 seq); 632 void rds_send_remove_from_sock(struct list_head *messages, int status); 633 int rds_send_pong(struct rds_connection *conn, __be16 dport); 634 struct rds_message *rds_send_get_message(struct rds_connection *, 635 struct rds_rdma_op *); 636 637 /* rdma.c */ 638 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 639 640 /* stats.c */ 641 DECLARE_PER_CPU(struct rds_statistics, rds_stats); 642 #define rds_stats_inc_which(which, member) do { \ 643 per_cpu(which, get_cpu()).member++; \ 644 put_cpu(); \ 645 } while (0) 646 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 647 #define rds_stats_add_which(which, member, count) do { \ 648 per_cpu(which, get_cpu()).member += count; \ 649 put_cpu(); \ 650 } while (0) 651 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 652 int __init rds_stats_init(void); 653 void rds_stats_exit(void); 654 void rds_stats_info_copy(struct rds_info_iterator *iter, 655 uint64_t *values, char **names, size_t nr); 656 657 /* sysctl.c */ 658 int __init rds_sysctl_init(void); 659 void rds_sysctl_exit(void); 660 extern unsigned long rds_sysctl_sndbuf_min; 661 extern unsigned long rds_sysctl_sndbuf_default; 662 extern unsigned long rds_sysctl_sndbuf_max; 663 extern unsigned long rds_sysctl_reconnect_min_jiffies; 664 extern unsigned long rds_sysctl_reconnect_max_jiffies; 665 extern unsigned int rds_sysctl_max_unacked_packets; 666 extern unsigned int rds_sysctl_max_unacked_bytes; 667 extern unsigned int rds_sysctl_ping_enable; 668 extern unsigned long rds_sysctl_trace_flags; 669 extern unsigned int rds_sysctl_trace_level; 670 671 /* threads.c */ 672 int __init rds_threads_init(void); 673 void rds_threads_exit(void); 674 extern struct workqueue_struct *rds_wq; 675 void rds_connect_worker(struct work_struct *); 676 void rds_shutdown_worker(struct work_struct *); 677 void rds_send_worker(struct work_struct *); 678 void rds_recv_worker(struct work_struct *); 679 void rds_connect_complete(struct rds_connection *conn); 680 681 /* transport.c */ 682 int rds_trans_register(struct rds_transport *trans); 683 void rds_trans_unregister(struct rds_transport *trans); 684 struct rds_transport *rds_trans_get_preferred(__be32 addr); 685 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 686 unsigned int avail); 687 int __init rds_trans_init(void); 688 void rds_trans_exit(void); 689 690 #endif 691