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 */ 39static inline __printf(1, 2) 40void 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_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 54#define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 55 56struct rds_cong_map { 57 struct rb_node m_rb_node; 58 __be32 m_addr; 59 wait_queue_head_t m_waitq; 60 struct list_head m_conn_list; 61 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 62}; 63 64 65/* 66 * This is how we will track the connection state: 67 * A connection is always in one of the following 68 * states. Updates to the state are atomic and imply 69 * a memory barrier. 70 */ 71enum { 72 RDS_CONN_DOWN = 0, 73 RDS_CONN_CONNECTING, 74 RDS_CONN_DISCONNECTING, 75 RDS_CONN_UP, 76 RDS_CONN_ERROR, 77}; 78 79/* Bits for c_flags */ 80#define RDS_LL_SEND_FULL 0 81#define RDS_RECONNECT_PENDING 1 82#define RDS_IN_XMIT 2 83 84struct 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 rds_message *c_xmit_rm; 95 unsigned long c_xmit_sg; 96 unsigned int c_xmit_hdr_off; 97 unsigned int c_xmit_data_off; 98 unsigned int c_xmit_atomic_sent; 99 unsigned int c_xmit_rdma_sent; 100 unsigned int c_xmit_data_sent; 101 102 spinlock_t c_lock; /* protect msg queues */ 103 u64 c_next_tx_seq; 104 struct list_head c_send_queue; 105 struct list_head c_retrans; 106 107 u64 c_next_rx_seq; 108 109 struct rds_transport *c_trans; 110 void *c_transport_data; 111 112 atomic_t c_state; 113 unsigned long c_send_gen; 114 unsigned long c_flags; 115 unsigned long c_reconnect_jiffies; 116 struct delayed_work c_send_w; 117 struct delayed_work c_recv_w; 118 struct delayed_work c_conn_w; 119 struct work_struct c_down_w; 120 struct mutex c_cm_lock; /* protect conn state & cm */ 121 wait_queue_head_t c_waitq; 122 123 struct list_head c_map_item; 124 unsigned long c_map_queued; 125 126 unsigned int c_unacked_packets; 127 unsigned int c_unacked_bytes; 128 129 /* Protocol version */ 130 unsigned int c_version; 131}; 132 133#define RDS_FLAG_CONG_BITMAP 0x01 134#define RDS_FLAG_ACK_REQUIRED 0x02 135#define RDS_FLAG_RETRANSMITTED 0x04 136#define RDS_MAX_ADV_CREDIT 255 137 138/* 139 * Maximum space available for extension headers. 140 */ 141#define RDS_HEADER_EXT_SPACE 16 142 143struct rds_header { 144 __be64 h_sequence; 145 __be64 h_ack; 146 __be32 h_len; 147 __be16 h_sport; 148 __be16 h_dport; 149 u8 h_flags; 150 u8 h_credit; 151 u8 h_padding[4]; 152 __sum16 h_csum; 153 154 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 155}; 156 157/* 158 * Reserved - indicates end of extensions 159 */ 160#define RDS_EXTHDR_NONE 0 161 162/* 163 * This extension header is included in the very 164 * first message that is sent on a new connection, 165 * and identifies the protocol level. This will help 166 * rolling updates if a future change requires breaking 167 * the protocol. 168 * NB: This is no longer true for IB, where we do a version 169 * negotiation during the connection setup phase (protocol 170 * version information is included in the RDMA CM private data). 171 */ 172#define RDS_EXTHDR_VERSION 1 173struct rds_ext_header_version { 174 __be32 h_version; 175}; 176 177/* 178 * This extension header is included in the RDS message 179 * chasing an RDMA operation. 180 */ 181#define RDS_EXTHDR_RDMA 2 182struct rds_ext_header_rdma { 183 __be32 h_rdma_rkey; 184}; 185 186/* 187 * This extension header tells the peer about the 188 * destination <R_Key,offset> of the requested RDMA 189 * operation. 190 */ 191#define RDS_EXTHDR_RDMA_DEST 3 192struct rds_ext_header_rdma_dest { 193 __be32 h_rdma_rkey; 194 __be32 h_rdma_offset; 195}; 196 197#define __RDS_EXTHDR_MAX 16 /* for now */ 198 199struct rds_incoming { 200 atomic_t i_refcount; 201 struct list_head i_item; 202 struct rds_connection *i_conn; 203 struct rds_header i_hdr; 204 unsigned long i_rx_jiffies; 205 __be32 i_saddr; 206 207 rds_rdma_cookie_t i_rdma_cookie; 208}; 209 210struct rds_mr { 211 struct rb_node r_rb_node; 212 atomic_t r_refcount; 213 u32 r_key; 214 215 /* A copy of the creation flags */ 216 unsigned int r_use_once:1; 217 unsigned int r_invalidate:1; 218 unsigned int r_write:1; 219 220 /* This is for RDS_MR_DEAD. 221 * It would be nice & consistent to make this part of the above 222 * bit field here, but we need to use test_and_set_bit. 223 */ 224 unsigned long r_state; 225 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 226 struct rds_transport *r_trans; 227 void *r_trans_private; 228}; 229 230/* Flags for mr->r_state */ 231#define RDS_MR_DEAD 0 232 233static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 234{ 235 return r_key | (((u64) offset) << 32); 236} 237 238static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 239{ 240 return cookie; 241} 242 243static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 244{ 245 return cookie >> 32; 246} 247 248/* atomic operation types */ 249#define RDS_ATOMIC_TYPE_CSWP 0 250#define RDS_ATOMIC_TYPE_FADD 1 251 252/* 253 * m_sock_item and m_conn_item are on lists that are serialized under 254 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 255 * the message will not be put back on the retransmit list after being sent. 256 * messages that are canceled while being sent rely on this. 257 * 258 * m_inc is used by loopback so that it can pass an incoming message straight 259 * back up into the rx path. It embeds a wire header which is also used by 260 * the send path, which is kind of awkward. 261 * 262 * m_sock_item indicates the message's presence on a socket's send or receive 263 * queue. m_rs will point to that socket. 264 * 265 * m_daddr is used by cancellation to prune messages to a given destination. 266 * 267 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 268 * nesting. As paths iterate over messages on a sock, or conn, they must 269 * also lock the conn, or sock, to remove the message from those lists too. 270 * Testing the flag to determine if the message is still on the lists lets 271 * us avoid testing the list_head directly. That means each path can use 272 * the message's list_head to keep it on a local list while juggling locks 273 * without confusing the other path. 274 * 275 * m_ack_seq is an optional field set by transports who need a different 276 * sequence number range to invalidate. They can use this in a callback 277 * that they pass to rds_send_drop_acked() to see if each message has been 278 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 279 * had ack_seq set yet. 280 */ 281#define RDS_MSG_ON_SOCK 1 282#define RDS_MSG_ON_CONN 2 283#define RDS_MSG_HAS_ACK_SEQ 3 284#define RDS_MSG_ACK_REQUIRED 4 285#define RDS_MSG_RETRANSMITTED 5 286#define RDS_MSG_MAPPED 6 287#define RDS_MSG_PAGEVEC 7 288 289struct rds_message { 290 atomic_t m_refcount; 291 struct list_head m_sock_item; 292 struct list_head m_conn_item; 293 struct rds_incoming m_inc; 294 u64 m_ack_seq; 295 __be32 m_daddr; 296 unsigned long m_flags; 297 298 /* Never access m_rs without holding m_rs_lock. 299 * Lock nesting is 300 * rm->m_rs_lock 301 * -> rs->rs_lock 302 */ 303 spinlock_t m_rs_lock; 304 wait_queue_head_t m_flush_wait; 305 306 struct rds_sock *m_rs; 307 308 /* cookie to send to remote, in rds header */ 309 rds_rdma_cookie_t m_rdma_cookie; 310 311 unsigned int m_used_sgs; 312 unsigned int m_total_sgs; 313 314 void *m_final_op; 315 316 struct { 317 struct rm_atomic_op { 318 int op_type; 319 union { 320 struct { 321 uint64_t compare; 322 uint64_t swap; 323 uint64_t compare_mask; 324 uint64_t swap_mask; 325 } op_m_cswp; 326 struct { 327 uint64_t add; 328 uint64_t nocarry_mask; 329 } op_m_fadd; 330 }; 331 332 u32 op_rkey; 333 u64 op_remote_addr; 334 unsigned int op_notify:1; 335 unsigned int op_recverr:1; 336 unsigned int op_mapped:1; 337 unsigned int op_silent:1; 338 unsigned int op_active:1; 339 struct scatterlist *op_sg; 340 struct rds_notifier *op_notifier; 341 342 struct rds_mr *op_rdma_mr; 343 } atomic; 344 struct rm_rdma_op { 345 u32 op_rkey; 346 u64 op_remote_addr; 347 unsigned int op_write:1; 348 unsigned int op_fence:1; 349 unsigned int op_notify:1; 350 unsigned int op_recverr:1; 351 unsigned int op_mapped:1; 352 unsigned int op_silent:1; 353 unsigned int op_active:1; 354 unsigned int op_bytes; 355 unsigned int op_nents; 356 unsigned int op_count; 357 struct scatterlist *op_sg; 358 struct rds_notifier *op_notifier; 359 360 struct rds_mr *op_rdma_mr; 361 } rdma; 362 struct rm_data_op { 363 unsigned int op_active:1; 364 unsigned int op_nents; 365 unsigned int op_count; 366 struct scatterlist *op_sg; 367 } data; 368 }; 369}; 370 371/* 372 * The RDS notifier is used (optionally) to tell the application about 373 * completed RDMA operations. Rather than keeping the whole rds message 374 * around on the queue, we allocate a small notifier that is put on the 375 * socket's notifier_list. Notifications are delivered to the application 376 * through control messages. 377 */ 378struct rds_notifier { 379 struct list_head n_list; 380 uint64_t n_user_token; 381 int n_status; 382}; 383 384/** 385 * struct rds_transport - transport specific behavioural hooks 386 * 387 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 388 * part of a message. The caller serializes on the send_sem so this 389 * doesn't need to be reentrant for a given conn. The header must be 390 * sent before the data payload. .xmit must be prepared to send a 391 * message with no data payload. .xmit should return the number of 392 * bytes that were sent down the connection, including header bytes. 393 * Returning 0 tells the caller that it doesn't need to perform any 394 * additional work now. This is usually the case when the transport has 395 * filled the sending queue for its connection and will handle 396 * triggering the rds thread to continue the send when space becomes 397 * available. Returning -EAGAIN tells the caller to retry the send 398 * immediately. Returning -ENOMEM tells the caller to retry the send at 399 * some point in the future. 400 * 401 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 402 * it returns the connection can not call rds_recv_incoming(). 403 * This will only be called once after conn_connect returns 404 * non-zero success and will The caller serializes this with 405 * the send and connecting paths (xmit_* and conn_*). The 406 * transport is responsible for other serialization, including 407 * rds_recv_incoming(). This is called in process context but 408 * should try hard not to block. 409 */ 410 411#define RDS_TRANS_IB 0 412#define RDS_TRANS_IWARP 1 413#define RDS_TRANS_TCP 2 414#define RDS_TRANS_COUNT 3 415 416struct rds_transport { 417 char t_name[TRANSNAMSIZ]; 418 struct list_head t_item; 419 struct module *t_owner; 420 unsigned int t_prefer_loopback:1; 421 unsigned int t_type; 422 423 int (*laddr_check)(__be32 addr); 424 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 425 void (*conn_free)(void *data); 426 int (*conn_connect)(struct rds_connection *conn); 427 void (*conn_shutdown)(struct rds_connection *conn); 428 void (*xmit_prepare)(struct rds_connection *conn); 429 void (*xmit_complete)(struct rds_connection *conn); 430 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 431 unsigned int hdr_off, unsigned int sg, unsigned int off); 432 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 433 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 434 int (*recv)(struct rds_connection *conn); 435 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 436 void (*inc_free)(struct rds_incoming *inc); 437 438 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 439 struct rdma_cm_event *event); 440 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 441 void (*cm_connect_complete)(struct rds_connection *conn, 442 struct rdma_cm_event *event); 443 444 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 445 unsigned int avail); 446 void (*exit)(void); 447 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 448 struct rds_sock *rs, u32 *key_ret); 449 void (*sync_mr)(void *trans_private, int direction); 450 void (*free_mr)(void *trans_private, int invalidate); 451 void (*flush_mrs)(void); 452}; 453 454struct rds_sock { 455 struct sock rs_sk; 456 457 u64 rs_user_addr; 458 u64 rs_user_bytes; 459 460 /* 461 * bound_addr used for both incoming and outgoing, no INADDR_ANY 462 * support. 463 */ 464 struct hlist_node rs_bound_node; 465 __be32 rs_bound_addr; 466 __be32 rs_conn_addr; 467 __be16 rs_bound_port; 468 __be16 rs_conn_port; 469 struct rds_transport *rs_transport; 470 471 /* 472 * rds_sendmsg caches the conn it used the last time around. 473 * This helps avoid costly lookups. 474 */ 475 struct rds_connection *rs_conn; 476 477 /* flag indicating we were congested or not */ 478 int rs_congested; 479 /* seen congestion (ENOBUFS) when sending? */ 480 int rs_seen_congestion; 481 482 /* rs_lock protects all these adjacent members before the newline */ 483 spinlock_t rs_lock; 484 struct list_head rs_send_queue; 485 u32 rs_snd_bytes; 486 int rs_rcv_bytes; 487 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 488 489 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 490 * to decide whether the application should be woken up. 491 * If not set, we use rs_cong_track to find out whether a cong map 492 * update arrived. 493 */ 494 uint64_t rs_cong_mask; 495 uint64_t rs_cong_notify; 496 struct list_head rs_cong_list; 497 unsigned long rs_cong_track; 498 499 /* 500 * rs_recv_lock protects the receive queue, and is 501 * used to serialize with rds_release. 502 */ 503 rwlock_t rs_recv_lock; 504 struct list_head rs_recv_queue; 505 506 /* just for stats reporting */ 507 struct list_head rs_item; 508 509 /* these have their own lock */ 510 spinlock_t rs_rdma_lock; 511 struct rb_root rs_rdma_keys; 512 513 /* Socket options - in case there will be more */ 514 unsigned char rs_recverr, 515 rs_cong_monitor; 516}; 517 518static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 519{ 520 return container_of(sk, struct rds_sock, rs_sk); 521} 522static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 523{ 524 return &rs->rs_sk; 525} 526 527/* 528 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 529 * to account for overhead. We don't account for overhead, we just apply 530 * the number of payload bytes to the specified value. 531 */ 532static inline int rds_sk_sndbuf(struct rds_sock *rs) 533{ 534 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 535} 536static inline int rds_sk_rcvbuf(struct rds_sock *rs) 537{ 538 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 539} 540 541struct rds_statistics { 542 uint64_t s_conn_reset; 543 uint64_t s_recv_drop_bad_checksum; 544 uint64_t s_recv_drop_old_seq; 545 uint64_t s_recv_drop_no_sock; 546 uint64_t s_recv_drop_dead_sock; 547 uint64_t s_recv_deliver_raced; 548 uint64_t s_recv_delivered; 549 uint64_t s_recv_queued; 550 uint64_t s_recv_immediate_retry; 551 uint64_t s_recv_delayed_retry; 552 uint64_t s_recv_ack_required; 553 uint64_t s_recv_rdma_bytes; 554 uint64_t s_recv_ping; 555 uint64_t s_send_queue_empty; 556 uint64_t s_send_queue_full; 557 uint64_t s_send_lock_contention; 558 uint64_t s_send_lock_queue_raced; 559 uint64_t s_send_immediate_retry; 560 uint64_t s_send_delayed_retry; 561 uint64_t s_send_drop_acked; 562 uint64_t s_send_ack_required; 563 uint64_t s_send_queued; 564 uint64_t s_send_rdma; 565 uint64_t s_send_rdma_bytes; 566 uint64_t s_send_pong; 567 uint64_t s_page_remainder_hit; 568 uint64_t s_page_remainder_miss; 569 uint64_t s_copy_to_user; 570 uint64_t s_copy_from_user; 571 uint64_t s_cong_update_queued; 572 uint64_t s_cong_update_received; 573 uint64_t s_cong_send_error; 574 uint64_t s_cong_send_blocked; 575}; 576 577/* af_rds.c */ 578char *rds_str_array(char **array, size_t elements, size_t index); 579void rds_sock_addref(struct rds_sock *rs); 580void rds_sock_put(struct rds_sock *rs); 581void rds_wake_sk_sleep(struct rds_sock *rs); 582static inline void __rds_wake_sk_sleep(struct sock *sk) 583{ 584 wait_queue_head_t *waitq = sk_sleep(sk); 585 586 if (!sock_flag(sk, SOCK_DEAD) && waitq) 587 wake_up(waitq); 588} 589extern wait_queue_head_t rds_poll_waitq; 590 591 592/* bind.c */ 593int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 594void rds_remove_bound(struct rds_sock *rs); 595struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 596 597/* cong.c */ 598int rds_cong_get_maps(struct rds_connection *conn); 599void rds_cong_add_conn(struct rds_connection *conn); 600void rds_cong_remove_conn(struct rds_connection *conn); 601void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 602void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 603int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 604void rds_cong_queue_updates(struct rds_cong_map *map); 605void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 606int rds_cong_updated_since(unsigned long *recent); 607void rds_cong_add_socket(struct rds_sock *); 608void rds_cong_remove_socket(struct rds_sock *); 609void rds_cong_exit(void); 610struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 611 612/* conn.c */ 613int rds_conn_init(void); 614void rds_conn_exit(void); 615struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 616 struct rds_transport *trans, gfp_t gfp); 617struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 618 struct rds_transport *trans, gfp_t gfp); 619void rds_conn_shutdown(struct rds_connection *conn); 620void rds_conn_destroy(struct rds_connection *conn); 621void rds_conn_drop(struct rds_connection *conn); 622void rds_conn_connect_if_down(struct rds_connection *conn); 623void rds_for_each_conn_info(struct socket *sock, unsigned int len, 624 struct rds_info_iterator *iter, 625 struct rds_info_lengths *lens, 626 int (*visitor)(struct rds_connection *, void *), 627 size_t item_len); 628__printf(2, 3) 629void __rds_conn_error(struct rds_connection *conn, const char *, ...); 630#define rds_conn_error(conn, fmt...) \ 631 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 632 633static inline int 634rds_conn_transition(struct rds_connection *conn, int old, int new) 635{ 636 return atomic_cmpxchg(&conn->c_state, old, new) == old; 637} 638 639static inline int 640rds_conn_state(struct rds_connection *conn) 641{ 642 return atomic_read(&conn->c_state); 643} 644 645static inline int 646rds_conn_up(struct rds_connection *conn) 647{ 648 return atomic_read(&conn->c_state) == RDS_CONN_UP; 649} 650 651static inline int 652rds_conn_connecting(struct rds_connection *conn) 653{ 654 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 655} 656 657/* message.c */ 658struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 659struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 660int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 661struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 662void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 663 __be16 dport, u64 seq); 664int rds_message_add_extension(struct rds_header *hdr, 665 unsigned int type, const void *data, unsigned int len); 666int rds_message_next_extension(struct rds_header *hdr, 667 unsigned int *pos, void *buf, unsigned int *buflen); 668int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 669int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 670void rds_message_inc_free(struct rds_incoming *inc); 671void rds_message_addref(struct rds_message *rm); 672void rds_message_put(struct rds_message *rm); 673void rds_message_wait(struct rds_message *rm); 674void rds_message_unmapped(struct rds_message *rm); 675 676static inline void rds_message_make_checksum(struct rds_header *hdr) 677{ 678 hdr->h_csum = 0; 679 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 680} 681 682static inline int rds_message_verify_checksum(const struct rds_header *hdr) 683{ 684 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 685} 686 687 688/* page.c */ 689int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 690 gfp_t gfp); 691int rds_page_copy_user(struct page *page, unsigned long offset, 692 void __user *ptr, unsigned long bytes, 693 int to_user); 694#define rds_page_copy_to_user(page, offset, ptr, bytes) \ 695 rds_page_copy_user(page, offset, ptr, bytes, 1) 696#define rds_page_copy_from_user(page, offset, ptr, bytes) \ 697 rds_page_copy_user(page, offset, ptr, bytes, 0) 698void rds_page_exit(void); 699 700/* recv.c */ 701void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 702 __be32 saddr); 703void rds_inc_put(struct rds_incoming *inc); 704void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 705 struct rds_incoming *inc, gfp_t gfp); 706int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 707 int msg_flags); 708void rds_clear_recv_queue(struct rds_sock *rs); 709int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 710void rds_inc_info_copy(struct rds_incoming *inc, 711 struct rds_info_iterator *iter, 712 __be32 saddr, __be32 daddr, int flip); 713 714/* send.c */ 715int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 716void rds_send_reset(struct rds_connection *conn); 717int rds_send_xmit(struct rds_connection *conn); 718struct sockaddr_in; 719void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 720typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 721void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 722 is_acked_func is_acked); 723int rds_send_pong(struct rds_connection *conn, __be16 dport); 724struct rds_message *rds_send_get_message(struct rds_connection *, 725 struct rm_rdma_op *); 726 727/* rdma.c */ 728void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 729int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 730int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 731int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 732void rds_rdma_drop_keys(struct rds_sock *rs); 733int rds_rdma_extra_size(struct rds_rdma_args *args); 734int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 735 struct cmsghdr *cmsg); 736int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 737 struct cmsghdr *cmsg); 738int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 739 struct cmsghdr *cmsg); 740int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 741 struct cmsghdr *cmsg); 742void rds_rdma_free_op(struct rm_rdma_op *ro); 743void rds_atomic_free_op(struct rm_atomic_op *ao); 744void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 745void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 746int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 747 struct cmsghdr *cmsg); 748 749void __rds_put_mr_final(struct rds_mr *mr); 750static inline void rds_mr_put(struct rds_mr *mr) 751{ 752 if (atomic_dec_and_test(&mr->r_refcount)) 753 __rds_put_mr_final(mr); 754} 755 756/* stats.c */ 757DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 758#define rds_stats_inc_which(which, member) do { \ 759 per_cpu(which, get_cpu()).member++; \ 760 put_cpu(); \ 761} while (0) 762#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 763#define rds_stats_add_which(which, member, count) do { \ 764 per_cpu(which, get_cpu()).member += count; \ 765 put_cpu(); \ 766} while (0) 767#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 768int rds_stats_init(void); 769void rds_stats_exit(void); 770void rds_stats_info_copy(struct rds_info_iterator *iter, 771 uint64_t *values, const char *const *names, 772 size_t nr); 773 774/* sysctl.c */ 775int rds_sysctl_init(void); 776void rds_sysctl_exit(void); 777extern unsigned long rds_sysctl_sndbuf_min; 778extern unsigned long rds_sysctl_sndbuf_default; 779extern unsigned long rds_sysctl_sndbuf_max; 780extern unsigned long rds_sysctl_reconnect_min_jiffies; 781extern unsigned long rds_sysctl_reconnect_max_jiffies; 782extern unsigned int rds_sysctl_max_unacked_packets; 783extern unsigned int rds_sysctl_max_unacked_bytes; 784extern unsigned int rds_sysctl_ping_enable; 785extern unsigned long rds_sysctl_trace_flags; 786extern unsigned int rds_sysctl_trace_level; 787 788/* threads.c */ 789int rds_threads_init(void); 790void rds_threads_exit(void); 791extern struct workqueue_struct *rds_wq; 792void rds_queue_reconnect(struct rds_connection *conn); 793void rds_connect_worker(struct work_struct *); 794void rds_shutdown_worker(struct work_struct *); 795void rds_send_worker(struct work_struct *); 796void rds_recv_worker(struct work_struct *); 797void rds_connect_complete(struct rds_connection *conn); 798 799/* transport.c */ 800int rds_trans_register(struct rds_transport *trans); 801void rds_trans_unregister(struct rds_transport *trans); 802struct rds_transport *rds_trans_get_preferred(__be32 addr); 803void rds_trans_put(struct rds_transport *trans); 804unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 805 unsigned int avail); 806int rds_trans_init(void); 807void rds_trans_exit(void); 808 809#endif 810