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#define RDS_PORT 18634 24 25#ifdef ATOMIC64_INIT 26#define KERNEL_HAS_ATOMIC64 27#endif 28 29#ifdef DEBUG 30#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 31#else 32/* sigh, pr_debug() causes unused variable warnings */ 33static inline void __attribute__ ((format (printf, 1, 2))) 34rdsdebug(char *fmt, ...) 35{ 36} 37#endif 38 39#define ceil(x, y) \ 40 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 41 42#define RDS_FRAG_SHIFT 12 43#define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 44 45#define RDS_CONG_MAP_BYTES (65536 / 8) 46#define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long)) 47#define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 48#define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 49 50struct rds_cong_map { 51 struct rb_node m_rb_node; 52 __be32 m_addr; 53 wait_queue_head_t m_waitq; 54 struct list_head m_conn_list; 55 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 56}; 57 58 59/* 60 * This is how we will track the connection state: 61 * A connection is always in one of the following 62 * states. Updates to the state are atomic and imply 63 * a memory barrier. 64 */ 65enum { 66 RDS_CONN_DOWN = 0, 67 RDS_CONN_CONNECTING, 68 RDS_CONN_DISCONNECTING, 69 RDS_CONN_UP, 70 RDS_CONN_ERROR, 71}; 72 73/* Bits for c_flags */ 74#define RDS_LL_SEND_FULL 0 75#define RDS_RECONNECT_PENDING 1 76 77struct rds_connection { 78 struct hlist_node c_hash_node; 79 __be32 c_laddr; 80 __be32 c_faddr; 81 unsigned int c_loopback:1; 82 struct rds_connection *c_passive; 83 84 struct rds_cong_map *c_lcong; 85 struct rds_cong_map *c_fcong; 86 87 struct mutex c_send_lock; /* protect send ring */ 88 struct rds_message *c_xmit_rm; 89 unsigned long c_xmit_sg; 90 unsigned int c_xmit_hdr_off; 91 unsigned int c_xmit_data_off; 92 unsigned int c_xmit_rdma_sent; 93 94 spinlock_t c_lock; /* protect msg queues */ 95 u64 c_next_tx_seq; 96 struct list_head c_send_queue; 97 struct list_head c_retrans; 98 99 u64 c_next_rx_seq; 100 101 struct rds_transport *c_trans; 102 void *c_transport_data; 103 104 atomic_t c_state; 105 unsigned long c_flags; 106 unsigned long c_reconnect_jiffies; 107 struct delayed_work c_send_w; 108 struct delayed_work c_recv_w; 109 struct delayed_work c_conn_w; 110 struct work_struct c_down_w; 111 struct mutex c_cm_lock; /* protect conn state & cm */ 112 113 struct list_head c_map_item; 114 unsigned long c_map_queued; 115 unsigned long c_map_offset; 116 unsigned long c_map_bytes; 117 118 unsigned int c_unacked_packets; 119 unsigned int c_unacked_bytes; 120 121 /* Protocol version */ 122 unsigned int c_version; 123}; 124 125#define RDS_FLAG_CONG_BITMAP 0x01 126#define RDS_FLAG_ACK_REQUIRED 0x02 127#define RDS_FLAG_RETRANSMITTED 0x04 128#define RDS_MAX_ADV_CREDIT 255 129 130/* 131 * Maximum space available for extension headers. 132 */ 133#define RDS_HEADER_EXT_SPACE 16 134 135struct rds_header { 136 __be64 h_sequence; 137 __be64 h_ack; 138 __be32 h_len; 139 __be16 h_sport; 140 __be16 h_dport; 141 u8 h_flags; 142 u8 h_credit; 143 u8 h_padding[4]; 144 __sum16 h_csum; 145 146 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 147}; 148 149/* 150 * Reserved - indicates end of extensions 151 */ 152#define RDS_EXTHDR_NONE 0 153 154/* 155 * This extension header is included in the very 156 * first message that is sent on a new connection, 157 * and identifies the protocol level. This will help 158 * rolling updates if a future change requires breaking 159 * the protocol. 160 * NB: This is no longer true for IB, where we do a version 161 * negotiation during the connection setup phase (protocol 162 * version information is included in the RDMA CM private data). 163 */ 164#define RDS_EXTHDR_VERSION 1 165struct rds_ext_header_version { 166 __be32 h_version; 167}; 168 169/* 170 * This extension header is included in the RDS message 171 * chasing an RDMA operation. 172 */ 173#define RDS_EXTHDR_RDMA 2 174struct rds_ext_header_rdma { 175 __be32 h_rdma_rkey; 176}; 177 178/* 179 * This extension header tells the peer about the 180 * destination <R_Key,offset> of the requested RDMA 181 * operation. 182 */ 183#define RDS_EXTHDR_RDMA_DEST 3 184struct rds_ext_header_rdma_dest { 185 __be32 h_rdma_rkey; 186 __be32 h_rdma_offset; 187}; 188 189#define __RDS_EXTHDR_MAX 16 /* for now */ 190 191struct rds_incoming { 192 atomic_t i_refcount; 193 struct list_head i_item; 194 struct rds_connection *i_conn; 195 struct rds_header i_hdr; 196 unsigned long i_rx_jiffies; 197 __be32 i_saddr; 198 199 rds_rdma_cookie_t i_rdma_cookie; 200}; 201 202/* 203 * m_sock_item and m_conn_item are on lists that are serialized under 204 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 205 * the message will not be put back on the retransmit list after being sent. 206 * messages that are canceled while being sent rely on this. 207 * 208 * m_inc is used by loopback so that it can pass an incoming message straight 209 * back up into the rx path. It embeds a wire header which is also used by 210 * the send path, which is kind of awkward. 211 * 212 * m_sock_item indicates the message's presence on a socket's send or receive 213 * queue. m_rs will point to that socket. 214 * 215 * m_daddr is used by cancellation to prune messages to a given destination. 216 * 217 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 218 * nesting. As paths iterate over messages on a sock, or conn, they must 219 * also lock the conn, or sock, to remove the message from those lists too. 220 * Testing the flag to determine if the message is still on the lists lets 221 * us avoid testing the list_head directly. That means each path can use 222 * the message's list_head to keep it on a local list while juggling locks 223 * without confusing the other path. 224 * 225 * m_ack_seq is an optional field set by transports who need a different 226 * sequence number range to invalidate. They can use this in a callback 227 * that they pass to rds_send_drop_acked() to see if each message has been 228 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 229 * had ack_seq set yet. 230 */ 231#define RDS_MSG_ON_SOCK 1 232#define RDS_MSG_ON_CONN 2 233#define RDS_MSG_HAS_ACK_SEQ 3 234#define RDS_MSG_ACK_REQUIRED 4 235#define RDS_MSG_RETRANSMITTED 5 236#define RDS_MSG_MAPPED 6 237#define RDS_MSG_PAGEVEC 7 238 239struct rds_message { 240 atomic_t m_refcount; 241 struct list_head m_sock_item; 242 struct list_head m_conn_item; 243 struct rds_incoming m_inc; 244 u64 m_ack_seq; 245 __be32 m_daddr; 246 unsigned long m_flags; 247 248 /* Never access m_rs without holding m_rs_lock. 249 * Lock nesting is 250 * rm->m_rs_lock 251 * -> rs->rs_lock 252 */ 253 spinlock_t m_rs_lock; 254 struct rds_sock *m_rs; 255 struct rds_rdma_op *m_rdma_op; 256 rds_rdma_cookie_t m_rdma_cookie; 257 struct rds_mr *m_rdma_mr; 258 unsigned int m_nents; 259 unsigned int m_count; 260 struct scatterlist m_sg[0]; 261}; 262 263/* 264 * The RDS notifier is used (optionally) to tell the application about 265 * completed RDMA operations. Rather than keeping the whole rds message 266 * around on the queue, we allocate a small notifier that is put on the 267 * socket's notifier_list. Notifications are delivered to the application 268 * through control messages. 269 */ 270struct rds_notifier { 271 struct list_head n_list; 272 uint64_t n_user_token; 273 int n_status; 274}; 275 276 277#define RDS_TRANS_IB 0 278#define RDS_TRANS_IWARP 1 279#define RDS_TRANS_TCP 2 280#define RDS_TRANS_COUNT 3 281 282struct rds_transport { 283 char t_name[TRANSNAMSIZ]; 284 struct list_head t_item; 285 struct module *t_owner; 286 unsigned int t_prefer_loopback:1; 287 unsigned int t_type; 288 289 int (*laddr_check)(__be32 addr); 290 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 291 void (*conn_free)(void *data); 292 int (*conn_connect)(struct rds_connection *conn); 293 void (*conn_shutdown)(struct rds_connection *conn); 294 void (*xmit_prepare)(struct rds_connection *conn); 295 void (*xmit_complete)(struct rds_connection *conn); 296 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 297 unsigned int hdr_off, unsigned int sg, unsigned int off); 298 int (*xmit_cong_map)(struct rds_connection *conn, 299 struct rds_cong_map *map, unsigned long offset); 300 int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op); 301 int (*recv)(struct rds_connection *conn); 302 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov, 303 size_t size); 304 void (*inc_purge)(struct rds_incoming *inc); 305 void (*inc_free)(struct rds_incoming *inc); 306 307 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 308 struct rdma_cm_event *event); 309 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 310 void (*cm_connect_complete)(struct rds_connection *conn, 311 struct rdma_cm_event *event); 312 313 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 314 unsigned int avail); 315 void (*exit)(void); 316 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 317 struct rds_sock *rs, u32 *key_ret); 318 void (*sync_mr)(void *trans_private, int direction); 319 void (*free_mr)(void *trans_private, int invalidate); 320 void (*flush_mrs)(void); 321}; 322 323struct rds_sock { 324 struct sock rs_sk; 325 326 u64 rs_user_addr; 327 u64 rs_user_bytes; 328 329 /* 330 * bound_addr used for both incoming and outgoing, no INADDR_ANY 331 * support. 332 */ 333 struct rb_node rs_bound_node; 334 __be32 rs_bound_addr; 335 __be32 rs_conn_addr; 336 __be16 rs_bound_port; 337 __be16 rs_conn_port; 338 339 /* 340 * This is only used to communicate the transport between bind and 341 * initiating connections. All other trans use is referenced through 342 * the connection. 343 */ 344 struct rds_transport *rs_transport; 345 346 /* 347 * rds_sendmsg caches the conn it used the last time around. 348 * This helps avoid costly lookups. 349 */ 350 struct rds_connection *rs_conn; 351 352 /* flag indicating we were congested or not */ 353 int rs_congested; 354 /* seen congestion (ENOBUFS) when sending? */ 355 int rs_seen_congestion; 356 357 /* rs_lock protects all these adjacent members before the newline */ 358 spinlock_t rs_lock; 359 struct list_head rs_send_queue; 360 u32 rs_snd_bytes; 361 int rs_rcv_bytes; 362 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 363 364 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 365 * to decide whether the application should be woken up. 366 * If not set, we use rs_cong_track to find out whether a cong map 367 * update arrived. 368 */ 369 uint64_t rs_cong_mask; 370 uint64_t rs_cong_notify; 371 struct list_head rs_cong_list; 372 unsigned long rs_cong_track; 373 374 /* 375 * rs_recv_lock protects the receive queue, and is 376 * used to serialize with rds_release. 377 */ 378 rwlock_t rs_recv_lock; 379 struct list_head rs_recv_queue; 380 381 /* just for stats reporting */ 382 struct list_head rs_item; 383 384 /* these have their own lock */ 385 spinlock_t rs_rdma_lock; 386 struct rb_root rs_rdma_keys; 387 388 /* Socket options - in case there will be more */ 389 unsigned char rs_recverr, 390 rs_cong_monitor; 391}; 392 393static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 394{ 395 return container_of(sk, struct rds_sock, rs_sk); 396} 397static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 398{ 399 return &rs->rs_sk; 400} 401 402/* 403 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 404 * to account for overhead. We don't account for overhead, we just apply 405 * the number of payload bytes to the specified value. 406 */ 407static inline int rds_sk_sndbuf(struct rds_sock *rs) 408{ 409 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 410} 411static inline int rds_sk_rcvbuf(struct rds_sock *rs) 412{ 413 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 414} 415 416struct rds_statistics { 417 uint64_t s_conn_reset; 418 uint64_t s_recv_drop_bad_checksum; 419 uint64_t s_recv_drop_old_seq; 420 uint64_t s_recv_drop_no_sock; 421 uint64_t s_recv_drop_dead_sock; 422 uint64_t s_recv_deliver_raced; 423 uint64_t s_recv_delivered; 424 uint64_t s_recv_queued; 425 uint64_t s_recv_immediate_retry; 426 uint64_t s_recv_delayed_retry; 427 uint64_t s_recv_ack_required; 428 uint64_t s_recv_rdma_bytes; 429 uint64_t s_recv_ping; 430 uint64_t s_send_queue_empty; 431 uint64_t s_send_queue_full; 432 uint64_t s_send_sem_contention; 433 uint64_t s_send_sem_queue_raced; 434 uint64_t s_send_immediate_retry; 435 uint64_t s_send_delayed_retry; 436 uint64_t s_send_drop_acked; 437 uint64_t s_send_ack_required; 438 uint64_t s_send_queued; 439 uint64_t s_send_rdma; 440 uint64_t s_send_rdma_bytes; 441 uint64_t s_send_pong; 442 uint64_t s_page_remainder_hit; 443 uint64_t s_page_remainder_miss; 444 uint64_t s_copy_to_user; 445 uint64_t s_copy_from_user; 446 uint64_t s_cong_update_queued; 447 uint64_t s_cong_update_received; 448 uint64_t s_cong_send_error; 449 uint64_t s_cong_send_blocked; 450}; 451 452/* af_rds.c */ 453void rds_sock_addref(struct rds_sock *rs); 454void rds_sock_put(struct rds_sock *rs); 455void rds_wake_sk_sleep(struct rds_sock *rs); 456static inline void __rds_wake_sk_sleep(struct sock *sk) 457{ 458 wait_queue_head_t *waitq = sk_sleep(sk); 459 460 if (!sock_flag(sk, SOCK_DEAD) && waitq) 461 wake_up(waitq); 462} 463extern wait_queue_head_t rds_poll_waitq; 464 465 466/* bind.c */ 467int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 468void rds_remove_bound(struct rds_sock *rs); 469struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 470 471/* cong.c */ 472int rds_cong_get_maps(struct rds_connection *conn); 473void rds_cong_add_conn(struct rds_connection *conn); 474void rds_cong_remove_conn(struct rds_connection *conn); 475void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 476void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 477int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 478void rds_cong_queue_updates(struct rds_cong_map *map); 479void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 480int rds_cong_updated_since(unsigned long *recent); 481void rds_cong_add_socket(struct rds_sock *); 482void rds_cong_remove_socket(struct rds_sock *); 483void rds_cong_exit(void); 484struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 485 486/* conn.c */ 487int __init rds_conn_init(void); 488void rds_conn_exit(void); 489struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 490 struct rds_transport *trans, gfp_t gfp); 491struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 492 struct rds_transport *trans, gfp_t gfp); 493void rds_conn_destroy(struct rds_connection *conn); 494void rds_conn_reset(struct rds_connection *conn); 495void rds_conn_drop(struct rds_connection *conn); 496void rds_for_each_conn_info(struct socket *sock, unsigned int len, 497 struct rds_info_iterator *iter, 498 struct rds_info_lengths *lens, 499 int (*visitor)(struct rds_connection *, void *), 500 size_t item_len); 501void __rds_conn_error(struct rds_connection *conn, const char *, ...) 502 __attribute__ ((format (printf, 2, 3))); 503#define rds_conn_error(conn, fmt...) \ 504 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 505 506static inline int 507rds_conn_transition(struct rds_connection *conn, int old, int new) 508{ 509 return atomic_cmpxchg(&conn->c_state, old, new) == old; 510} 511 512static inline int 513rds_conn_state(struct rds_connection *conn) 514{ 515 return atomic_read(&conn->c_state); 516} 517 518static inline int 519rds_conn_up(struct rds_connection *conn) 520{ 521 return atomic_read(&conn->c_state) == RDS_CONN_UP; 522} 523 524static inline int 525rds_conn_connecting(struct rds_connection *conn) 526{ 527 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 528} 529 530/* message.c */ 531struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 532struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, 533 size_t total_len); 534struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 535void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 536 __be16 dport, u64 seq); 537int rds_message_add_extension(struct rds_header *hdr, 538 unsigned int type, const void *data, unsigned int len); 539int rds_message_next_extension(struct rds_header *hdr, 540 unsigned int *pos, void *buf, unsigned int *buflen); 541int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version); 542int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version); 543int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 544int rds_message_inc_copy_to_user(struct rds_incoming *inc, 545 struct iovec *first_iov, size_t size); 546void rds_message_inc_purge(struct rds_incoming *inc); 547void rds_message_inc_free(struct rds_incoming *inc); 548void rds_message_addref(struct rds_message *rm); 549void rds_message_put(struct rds_message *rm); 550void rds_message_wait(struct rds_message *rm); 551void rds_message_unmapped(struct rds_message *rm); 552 553static inline void rds_message_make_checksum(struct rds_header *hdr) 554{ 555 hdr->h_csum = 0; 556 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 557} 558 559static inline int rds_message_verify_checksum(const struct rds_header *hdr) 560{ 561 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 562} 563 564 565/* page.c */ 566int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 567 gfp_t gfp); 568int rds_page_copy_user(struct page *page, unsigned long offset, 569 void __user *ptr, unsigned long bytes, 570 int to_user); 571#define rds_page_copy_to_user(page, offset, ptr, bytes) \ 572 rds_page_copy_user(page, offset, ptr, bytes, 1) 573#define rds_page_copy_from_user(page, offset, ptr, bytes) \ 574 rds_page_copy_user(page, offset, ptr, bytes, 0) 575void rds_page_exit(void); 576 577/* recv.c */ 578void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 579 __be32 saddr); 580void rds_inc_addref(struct rds_incoming *inc); 581void rds_inc_put(struct rds_incoming *inc); 582void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 583 struct rds_incoming *inc, gfp_t gfp, enum km_type km); 584int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 585 size_t size, int msg_flags); 586void rds_clear_recv_queue(struct rds_sock *rs); 587int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 588void rds_inc_info_copy(struct rds_incoming *inc, 589 struct rds_info_iterator *iter, 590 __be32 saddr, __be32 daddr, int flip); 591 592/* send.c */ 593int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 594 size_t payload_len); 595void rds_send_reset(struct rds_connection *conn); 596int rds_send_xmit(struct rds_connection *conn); 597struct sockaddr_in; 598void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 599typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 600void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 601 is_acked_func is_acked); 602int rds_send_acked_before(struct rds_connection *conn, u64 seq); 603void rds_send_remove_from_sock(struct list_head *messages, int status); 604int rds_send_pong(struct rds_connection *conn, __be16 dport); 605struct rds_message *rds_send_get_message(struct rds_connection *, 606 struct rds_rdma_op *); 607 608/* rdma.c */ 609void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 610 611/* stats.c */ 612DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 613#define rds_stats_inc_which(which, member) do { \ 614 per_cpu(which, get_cpu()).member++; \ 615 put_cpu(); \ 616} while (0) 617#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 618#define rds_stats_add_which(which, member, count) do { \ 619 per_cpu(which, get_cpu()).member += count; \ 620 put_cpu(); \ 621} while (0) 622#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 623int __init rds_stats_init(void); 624void rds_stats_exit(void); 625void rds_stats_info_copy(struct rds_info_iterator *iter, 626 uint64_t *values, const char *const *names, 627 size_t nr); 628 629/* sysctl.c */ 630int __init rds_sysctl_init(void); 631void rds_sysctl_exit(void); 632extern unsigned long rds_sysctl_sndbuf_min; 633extern unsigned long rds_sysctl_sndbuf_default; 634extern unsigned long rds_sysctl_sndbuf_max; 635extern unsigned long rds_sysctl_reconnect_min_jiffies; 636extern unsigned long rds_sysctl_reconnect_max_jiffies; 637extern unsigned int rds_sysctl_max_unacked_packets; 638extern unsigned int rds_sysctl_max_unacked_bytes; 639extern unsigned int rds_sysctl_ping_enable; 640extern unsigned long rds_sysctl_trace_flags; 641extern unsigned int rds_sysctl_trace_level; 642 643/* threads.c */ 644int __init rds_threads_init(void); 645void rds_threads_exit(void); 646extern struct workqueue_struct *rds_wq; 647void rds_connect_worker(struct work_struct *); 648void rds_shutdown_worker(struct work_struct *); 649void rds_send_worker(struct work_struct *); 650void rds_recv_worker(struct work_struct *); 651void rds_connect_complete(struct rds_connection *conn); 652 653/* transport.c */ 654int rds_trans_register(struct rds_transport *trans); 655void rds_trans_unregister(struct rds_transport *trans); 656struct rds_transport *rds_trans_get_preferred(__be32 addr); 657unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 658 unsigned int avail); 659int __init rds_trans_init(void); 660void rds_trans_exit(void); 661 662#endif 663