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#include <linux/rhashtable.h> 11 12#include "info.h" 13 14/* 15 * RDS Network protocol version 16 */ 17#define RDS_PROTOCOL_3_0 0x0300 18#define RDS_PROTOCOL_3_1 0x0301 19#define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 20#define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) 21#define RDS_PROTOCOL_MINOR(v) ((v) & 255) 22#define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) 23 24/* 25 * XXX randomly chosen, but at least seems to be unused: 26 * # 18464-18768 Unassigned 27 * We should do better. We want a reserved port to discourage unpriv'ed 28 * userspace from listening. 29 */ 30#define RDS_PORT 18634 31 32#ifdef ATOMIC64_INIT 33#define KERNEL_HAS_ATOMIC64 34#endif 35 36#ifdef DEBUG 37#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 38#else 39/* sigh, pr_debug() causes unused variable warnings */ 40static inline __printf(1, 2) 41void rdsdebug(char *fmt, ...) 42{ 43} 44#endif 45 46/* XXX is there one of these somewhere? */ 47#define ceil(x, y) \ 48 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 49 50#define RDS_FRAG_SHIFT 12 51#define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 52 53#define RDS_CONG_MAP_BYTES (65536 / 8) 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 57struct 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 */ 72enum { 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#define RDS_IN_XMIT 2 84#define RDS_RECV_REFILL 3 85 86struct rds_connection { 87 struct hlist_node c_hash_node; 88 __be32 c_laddr; 89 __be32 c_faddr; 90 unsigned int c_loopback:1, 91 c_outgoing:1, 92 c_pad_to_32:30; 93 struct rds_connection *c_passive; 94 95 struct rds_cong_map *c_lcong; 96 struct rds_cong_map *c_fcong; 97 98 struct rds_message *c_xmit_rm; 99 unsigned long c_xmit_sg; 100 unsigned int c_xmit_hdr_off; 101 unsigned int c_xmit_data_off; 102 unsigned int c_xmit_atomic_sent; 103 unsigned int c_xmit_rdma_sent; 104 unsigned int c_xmit_data_sent; 105 106 spinlock_t c_lock; /* protect msg queues */ 107 u64 c_next_tx_seq; 108 struct list_head c_send_queue; 109 struct list_head c_retrans; 110 111 u64 c_next_rx_seq; 112 113 struct rds_transport *c_trans; 114 void *c_transport_data; 115 116 atomic_t c_state; 117 unsigned long c_send_gen; 118 unsigned long c_flags; 119 unsigned long c_reconnect_jiffies; 120 struct delayed_work c_send_w; 121 struct delayed_work c_recv_w; 122 struct delayed_work c_conn_w; 123 struct work_struct c_down_w; 124 struct mutex c_cm_lock; /* protect conn state & cm */ 125 wait_queue_head_t c_waitq; 126 127 struct list_head c_map_item; 128 unsigned long c_map_queued; 129 130 unsigned int c_unacked_packets; 131 unsigned int c_unacked_bytes; 132 133 /* Protocol version */ 134 unsigned int c_version; 135 possible_net_t c_net; 136}; 137 138static inline 139struct net *rds_conn_net(struct rds_connection *conn) 140{ 141 return read_pnet(&conn->c_net); 142} 143 144static inline 145void rds_conn_net_set(struct rds_connection *conn, struct net *net) 146{ 147 write_pnet(&conn->c_net, net); 148} 149 150#define RDS_FLAG_CONG_BITMAP 0x01 151#define RDS_FLAG_ACK_REQUIRED 0x02 152#define RDS_FLAG_RETRANSMITTED 0x04 153#define RDS_MAX_ADV_CREDIT 255 154 155/* 156 * Maximum space available for extension headers. 157 */ 158#define RDS_HEADER_EXT_SPACE 16 159 160struct rds_header { 161 __be64 h_sequence; 162 __be64 h_ack; 163 __be32 h_len; 164 __be16 h_sport; 165 __be16 h_dport; 166 u8 h_flags; 167 u8 h_credit; 168 u8 h_padding[4]; 169 __sum16 h_csum; 170 171 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 172}; 173 174/* 175 * Reserved - indicates end of extensions 176 */ 177#define RDS_EXTHDR_NONE 0 178 179/* 180 * This extension header is included in the very 181 * first message that is sent on a new connection, 182 * and identifies the protocol level. This will help 183 * rolling updates if a future change requires breaking 184 * the protocol. 185 * NB: This is no longer true for IB, where we do a version 186 * negotiation during the connection setup phase (protocol 187 * version information is included in the RDMA CM private data). 188 */ 189#define RDS_EXTHDR_VERSION 1 190struct rds_ext_header_version { 191 __be32 h_version; 192}; 193 194/* 195 * This extension header is included in the RDS message 196 * chasing an RDMA operation. 197 */ 198#define RDS_EXTHDR_RDMA 2 199struct rds_ext_header_rdma { 200 __be32 h_rdma_rkey; 201}; 202 203/* 204 * This extension header tells the peer about the 205 * destination <R_Key,offset> of the requested RDMA 206 * operation. 207 */ 208#define RDS_EXTHDR_RDMA_DEST 3 209struct rds_ext_header_rdma_dest { 210 __be32 h_rdma_rkey; 211 __be32 h_rdma_offset; 212}; 213 214#define __RDS_EXTHDR_MAX 16 /* for now */ 215 216struct rds_incoming { 217 atomic_t i_refcount; 218 struct list_head i_item; 219 struct rds_connection *i_conn; 220 struct rds_header i_hdr; 221 unsigned long i_rx_jiffies; 222 __be32 i_saddr; 223 224 rds_rdma_cookie_t i_rdma_cookie; 225}; 226 227struct rds_mr { 228 struct rb_node r_rb_node; 229 atomic_t r_refcount; 230 u32 r_key; 231 232 /* A copy of the creation flags */ 233 unsigned int r_use_once:1; 234 unsigned int r_invalidate:1; 235 unsigned int r_write:1; 236 237 /* This is for RDS_MR_DEAD. 238 * It would be nice & consistent to make this part of the above 239 * bit field here, but we need to use test_and_set_bit. 240 */ 241 unsigned long r_state; 242 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 243 struct rds_transport *r_trans; 244 void *r_trans_private; 245}; 246 247/* Flags for mr->r_state */ 248#define RDS_MR_DEAD 0 249 250static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 251{ 252 return r_key | (((u64) offset) << 32); 253} 254 255static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 256{ 257 return cookie; 258} 259 260static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 261{ 262 return cookie >> 32; 263} 264 265/* atomic operation types */ 266#define RDS_ATOMIC_TYPE_CSWP 0 267#define RDS_ATOMIC_TYPE_FADD 1 268 269/* 270 * m_sock_item and m_conn_item are on lists that are serialized under 271 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 272 * the message will not be put back on the retransmit list after being sent. 273 * messages that are canceled while being sent rely on this. 274 * 275 * m_inc is used by loopback so that it can pass an incoming message straight 276 * back up into the rx path. It embeds a wire header which is also used by 277 * the send path, which is kind of awkward. 278 * 279 * m_sock_item indicates the message's presence on a socket's send or receive 280 * queue. m_rs will point to that socket. 281 * 282 * m_daddr is used by cancellation to prune messages to a given destination. 283 * 284 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 285 * nesting. As paths iterate over messages on a sock, or conn, they must 286 * also lock the conn, or sock, to remove the message from those lists too. 287 * Testing the flag to determine if the message is still on the lists lets 288 * us avoid testing the list_head directly. That means each path can use 289 * the message's list_head to keep it on a local list while juggling locks 290 * without confusing the other path. 291 * 292 * m_ack_seq is an optional field set by transports who need a different 293 * sequence number range to invalidate. They can use this in a callback 294 * that they pass to rds_send_drop_acked() to see if each message has been 295 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 296 * had ack_seq set yet. 297 */ 298#define RDS_MSG_ON_SOCK 1 299#define RDS_MSG_ON_CONN 2 300#define RDS_MSG_HAS_ACK_SEQ 3 301#define RDS_MSG_ACK_REQUIRED 4 302#define RDS_MSG_RETRANSMITTED 5 303#define RDS_MSG_MAPPED 6 304#define RDS_MSG_PAGEVEC 7 305 306struct rds_message { 307 atomic_t m_refcount; 308 struct list_head m_sock_item; 309 struct list_head m_conn_item; 310 struct rds_incoming m_inc; 311 u64 m_ack_seq; 312 __be32 m_daddr; 313 unsigned long m_flags; 314 315 /* Never access m_rs without holding m_rs_lock. 316 * Lock nesting is 317 * rm->m_rs_lock 318 * -> rs->rs_lock 319 */ 320 spinlock_t m_rs_lock; 321 wait_queue_head_t m_flush_wait; 322 323 struct rds_sock *m_rs; 324 325 /* cookie to send to remote, in rds header */ 326 rds_rdma_cookie_t m_rdma_cookie; 327 328 unsigned int m_used_sgs; 329 unsigned int m_total_sgs; 330 331 void *m_final_op; 332 333 struct { 334 struct rm_atomic_op { 335 int op_type; 336 union { 337 struct { 338 uint64_t compare; 339 uint64_t swap; 340 uint64_t compare_mask; 341 uint64_t swap_mask; 342 } op_m_cswp; 343 struct { 344 uint64_t add; 345 uint64_t nocarry_mask; 346 } op_m_fadd; 347 }; 348 349 u32 op_rkey; 350 u64 op_remote_addr; 351 unsigned int op_notify:1; 352 unsigned int op_recverr:1; 353 unsigned int op_mapped:1; 354 unsigned int op_silent:1; 355 unsigned int op_active:1; 356 struct scatterlist *op_sg; 357 struct rds_notifier *op_notifier; 358 359 struct rds_mr *op_rdma_mr; 360 } atomic; 361 struct rm_rdma_op { 362 u32 op_rkey; 363 u64 op_remote_addr; 364 unsigned int op_write:1; 365 unsigned int op_fence:1; 366 unsigned int op_notify:1; 367 unsigned int op_recverr:1; 368 unsigned int op_mapped:1; 369 unsigned int op_silent:1; 370 unsigned int op_active:1; 371 unsigned int op_bytes; 372 unsigned int op_nents; 373 unsigned int op_count; 374 struct scatterlist *op_sg; 375 struct rds_notifier *op_notifier; 376 377 struct rds_mr *op_rdma_mr; 378 } rdma; 379 struct rm_data_op { 380 unsigned int op_active:1; 381 unsigned int op_nents; 382 unsigned int op_count; 383 unsigned int op_dmasg; 384 unsigned int op_dmaoff; 385 struct scatterlist *op_sg; 386 } data; 387 }; 388}; 389 390/* 391 * The RDS notifier is used (optionally) to tell the application about 392 * completed RDMA operations. Rather than keeping the whole rds message 393 * around on the queue, we allocate a small notifier that is put on the 394 * socket's notifier_list. Notifications are delivered to the application 395 * through control messages. 396 */ 397struct rds_notifier { 398 struct list_head n_list; 399 uint64_t n_user_token; 400 int n_status; 401}; 402 403/** 404 * struct rds_transport - transport specific behavioural hooks 405 * 406 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 407 * part of a message. The caller serializes on the send_sem so this 408 * doesn't need to be reentrant for a given conn. The header must be 409 * sent before the data payload. .xmit must be prepared to send a 410 * message with no data payload. .xmit should return the number of 411 * bytes that were sent down the connection, including header bytes. 412 * Returning 0 tells the caller that it doesn't need to perform any 413 * additional work now. This is usually the case when the transport has 414 * filled the sending queue for its connection and will handle 415 * triggering the rds thread to continue the send when space becomes 416 * available. Returning -EAGAIN tells the caller to retry the send 417 * immediately. Returning -ENOMEM tells the caller to retry the send at 418 * some point in the future. 419 * 420 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 421 * it returns the connection can not call rds_recv_incoming(). 422 * This will only be called once after conn_connect returns 423 * non-zero success and will The caller serializes this with 424 * the send and connecting paths (xmit_* and conn_*). The 425 * transport is responsible for other serialization, including 426 * rds_recv_incoming(). This is called in process context but 427 * should try hard not to block. 428 */ 429 430struct rds_transport { 431 char t_name[TRANSNAMSIZ]; 432 struct list_head t_item; 433 struct module *t_owner; 434 unsigned int t_prefer_loopback:1; 435 unsigned int t_type; 436 437 int (*laddr_check)(struct net *net, __be32 addr); 438 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 439 void (*conn_free)(void *data); 440 int (*conn_connect)(struct rds_connection *conn); 441 void (*conn_shutdown)(struct rds_connection *conn); 442 void (*xmit_prepare)(struct rds_connection *conn); 443 void (*xmit_complete)(struct rds_connection *conn); 444 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 445 unsigned int hdr_off, unsigned int sg, unsigned int off); 446 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 447 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 448 int (*recv)(struct rds_connection *conn); 449 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 450 void (*inc_free)(struct rds_incoming *inc); 451 452 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 453 struct rdma_cm_event *event); 454 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 455 void (*cm_connect_complete)(struct rds_connection *conn, 456 struct rdma_cm_event *event); 457 458 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 459 unsigned int avail); 460 void (*exit)(void); 461 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 462 struct rds_sock *rs, u32 *key_ret); 463 void (*sync_mr)(void *trans_private, int direction); 464 void (*free_mr)(void *trans_private, int invalidate); 465 void (*flush_mrs)(void); 466}; 467 468struct rds_sock { 469 struct sock rs_sk; 470 471 u64 rs_user_addr; 472 u64 rs_user_bytes; 473 474 /* 475 * bound_addr used for both incoming and outgoing, no INADDR_ANY 476 * support. 477 */ 478 struct rhash_head rs_bound_node; 479 u64 rs_bound_key; 480 __be32 rs_bound_addr; 481 __be32 rs_conn_addr; 482 __be16 rs_bound_port; 483 __be16 rs_conn_port; 484 struct rds_transport *rs_transport; 485 486 /* 487 * rds_sendmsg caches the conn it used the last time around. 488 * This helps avoid costly lookups. 489 */ 490 struct rds_connection *rs_conn; 491 492 /* flag indicating we were congested or not */ 493 int rs_congested; 494 /* seen congestion (ENOBUFS) when sending? */ 495 int rs_seen_congestion; 496 497 /* rs_lock protects all these adjacent members before the newline */ 498 spinlock_t rs_lock; 499 struct list_head rs_send_queue; 500 u32 rs_snd_bytes; 501 int rs_rcv_bytes; 502 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 503 504 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 505 * to decide whether the application should be woken up. 506 * If not set, we use rs_cong_track to find out whether a cong map 507 * update arrived. 508 */ 509 uint64_t rs_cong_mask; 510 uint64_t rs_cong_notify; 511 struct list_head rs_cong_list; 512 unsigned long rs_cong_track; 513 514 /* 515 * rs_recv_lock protects the receive queue, and is 516 * used to serialize with rds_release. 517 */ 518 rwlock_t rs_recv_lock; 519 struct list_head rs_recv_queue; 520 521 /* just for stats reporting */ 522 struct list_head rs_item; 523 524 /* these have their own lock */ 525 spinlock_t rs_rdma_lock; 526 struct rb_root rs_rdma_keys; 527 528 /* Socket options - in case there will be more */ 529 unsigned char rs_recverr, 530 rs_cong_monitor; 531}; 532 533static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 534{ 535 return container_of(sk, struct rds_sock, rs_sk); 536} 537static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 538{ 539 return &rs->rs_sk; 540} 541 542/* 543 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 544 * to account for overhead. We don't account for overhead, we just apply 545 * the number of payload bytes to the specified value. 546 */ 547static inline int rds_sk_sndbuf(struct rds_sock *rs) 548{ 549 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 550} 551static inline int rds_sk_rcvbuf(struct rds_sock *rs) 552{ 553 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 554} 555 556struct rds_statistics { 557 uint64_t s_conn_reset; 558 uint64_t s_recv_drop_bad_checksum; 559 uint64_t s_recv_drop_old_seq; 560 uint64_t s_recv_drop_no_sock; 561 uint64_t s_recv_drop_dead_sock; 562 uint64_t s_recv_deliver_raced; 563 uint64_t s_recv_delivered; 564 uint64_t s_recv_queued; 565 uint64_t s_recv_immediate_retry; 566 uint64_t s_recv_delayed_retry; 567 uint64_t s_recv_ack_required; 568 uint64_t s_recv_rdma_bytes; 569 uint64_t s_recv_ping; 570 uint64_t s_send_queue_empty; 571 uint64_t s_send_queue_full; 572 uint64_t s_send_lock_contention; 573 uint64_t s_send_lock_queue_raced; 574 uint64_t s_send_immediate_retry; 575 uint64_t s_send_delayed_retry; 576 uint64_t s_send_drop_acked; 577 uint64_t s_send_ack_required; 578 uint64_t s_send_queued; 579 uint64_t s_send_rdma; 580 uint64_t s_send_rdma_bytes; 581 uint64_t s_send_pong; 582 uint64_t s_page_remainder_hit; 583 uint64_t s_page_remainder_miss; 584 uint64_t s_copy_to_user; 585 uint64_t s_copy_from_user; 586 uint64_t s_cong_update_queued; 587 uint64_t s_cong_update_received; 588 uint64_t s_cong_send_error; 589 uint64_t s_cong_send_blocked; 590}; 591 592/* af_rds.c */ 593void rds_sock_addref(struct rds_sock *rs); 594void rds_sock_put(struct rds_sock *rs); 595void rds_wake_sk_sleep(struct rds_sock *rs); 596static inline void __rds_wake_sk_sleep(struct sock *sk) 597{ 598 wait_queue_head_t *waitq = sk_sleep(sk); 599 600 if (!sock_flag(sk, SOCK_DEAD) && waitq) 601 wake_up(waitq); 602} 603extern wait_queue_head_t rds_poll_waitq; 604 605 606/* bind.c */ 607int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 608void rds_remove_bound(struct rds_sock *rs); 609struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 610int rds_bind_lock_init(void); 611void rds_bind_lock_destroy(void); 612 613/* cong.c */ 614int rds_cong_get_maps(struct rds_connection *conn); 615void rds_cong_add_conn(struct rds_connection *conn); 616void rds_cong_remove_conn(struct rds_connection *conn); 617void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 618void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 619int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 620void rds_cong_queue_updates(struct rds_cong_map *map); 621void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 622int rds_cong_updated_since(unsigned long *recent); 623void rds_cong_add_socket(struct rds_sock *); 624void rds_cong_remove_socket(struct rds_sock *); 625void rds_cong_exit(void); 626struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 627 628/* conn.c */ 629int rds_conn_init(void); 630void rds_conn_exit(void); 631struct rds_connection *rds_conn_create(struct net *net, 632 __be32 laddr, __be32 faddr, 633 struct rds_transport *trans, gfp_t gfp); 634struct rds_connection *rds_conn_create_outgoing(struct net *net, 635 __be32 laddr, __be32 faddr, 636 struct rds_transport *trans, gfp_t gfp); 637void rds_conn_shutdown(struct rds_connection *conn); 638void rds_conn_destroy(struct rds_connection *conn); 639void rds_conn_drop(struct rds_connection *conn); 640void rds_conn_connect_if_down(struct rds_connection *conn); 641void rds_for_each_conn_info(struct socket *sock, unsigned int len, 642 struct rds_info_iterator *iter, 643 struct rds_info_lengths *lens, 644 int (*visitor)(struct rds_connection *, void *), 645 size_t item_len); 646__printf(2, 3) 647void __rds_conn_error(struct rds_connection *conn, const char *, ...); 648#define rds_conn_error(conn, fmt...) \ 649 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 650 651static inline int 652rds_conn_transition(struct rds_connection *conn, int old, int new) 653{ 654 return atomic_cmpxchg(&conn->c_state, old, new) == old; 655} 656 657static inline int 658rds_conn_state(struct rds_connection *conn) 659{ 660 return atomic_read(&conn->c_state); 661} 662 663static inline int 664rds_conn_up(struct rds_connection *conn) 665{ 666 return atomic_read(&conn->c_state) == RDS_CONN_UP; 667} 668 669static inline int 670rds_conn_connecting(struct rds_connection *conn) 671{ 672 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 673} 674 675/* message.c */ 676struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 677struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 678int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 679struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 680void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 681 __be16 dport, u64 seq); 682int rds_message_add_extension(struct rds_header *hdr, 683 unsigned int type, const void *data, unsigned int len); 684int rds_message_next_extension(struct rds_header *hdr, 685 unsigned int *pos, void *buf, unsigned int *buflen); 686int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 687int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 688void rds_message_inc_free(struct rds_incoming *inc); 689void rds_message_addref(struct rds_message *rm); 690void rds_message_put(struct rds_message *rm); 691void rds_message_wait(struct rds_message *rm); 692void rds_message_unmapped(struct rds_message *rm); 693 694static inline void rds_message_make_checksum(struct rds_header *hdr) 695{ 696 hdr->h_csum = 0; 697 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 698} 699 700static inline int rds_message_verify_checksum(const struct rds_header *hdr) 701{ 702 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 703} 704 705 706/* page.c */ 707int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 708 gfp_t gfp); 709int rds_page_copy_user(struct page *page, unsigned long offset, 710 void __user *ptr, unsigned long bytes, 711 int to_user); 712#define rds_page_copy_to_user(page, offset, ptr, bytes) \ 713 rds_page_copy_user(page, offset, ptr, bytes, 1) 714#define rds_page_copy_from_user(page, offset, ptr, bytes) \ 715 rds_page_copy_user(page, offset, ptr, bytes, 0) 716void rds_page_exit(void); 717 718/* recv.c */ 719void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 720 __be32 saddr); 721void rds_inc_put(struct rds_incoming *inc); 722void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 723 struct rds_incoming *inc, gfp_t gfp); 724int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 725 int msg_flags); 726void rds_clear_recv_queue(struct rds_sock *rs); 727int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 728void rds_inc_info_copy(struct rds_incoming *inc, 729 struct rds_info_iterator *iter, 730 __be32 saddr, __be32 daddr, int flip); 731 732/* send.c */ 733int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 734void rds_send_reset(struct rds_connection *conn); 735int rds_send_xmit(struct rds_connection *conn); 736struct sockaddr_in; 737void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 738typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 739void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 740 is_acked_func is_acked); 741int rds_send_pong(struct rds_connection *conn, __be16 dport); 742struct rds_message *rds_send_get_message(struct rds_connection *, 743 struct rm_rdma_op *); 744 745/* rdma.c */ 746void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 747int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 748int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 749int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 750void rds_rdma_drop_keys(struct rds_sock *rs); 751int rds_rdma_extra_size(struct rds_rdma_args *args); 752int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 753 struct cmsghdr *cmsg); 754int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 755 struct cmsghdr *cmsg); 756int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 757 struct cmsghdr *cmsg); 758int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 759 struct cmsghdr *cmsg); 760void rds_rdma_free_op(struct rm_rdma_op *ro); 761void rds_atomic_free_op(struct rm_atomic_op *ao); 762void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 763void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 764int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 765 struct cmsghdr *cmsg); 766 767void __rds_put_mr_final(struct rds_mr *mr); 768static inline void rds_mr_put(struct rds_mr *mr) 769{ 770 if (atomic_dec_and_test(&mr->r_refcount)) 771 __rds_put_mr_final(mr); 772} 773 774/* stats.c */ 775DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 776#define rds_stats_inc_which(which, member) do { \ 777 per_cpu(which, get_cpu()).member++; \ 778 put_cpu(); \ 779} while (0) 780#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 781#define rds_stats_add_which(which, member, count) do { \ 782 per_cpu(which, get_cpu()).member += count; \ 783 put_cpu(); \ 784} while (0) 785#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 786int rds_stats_init(void); 787void rds_stats_exit(void); 788void rds_stats_info_copy(struct rds_info_iterator *iter, 789 uint64_t *values, const char *const *names, 790 size_t nr); 791 792/* sysctl.c */ 793int rds_sysctl_init(void); 794void rds_sysctl_exit(void); 795extern unsigned long rds_sysctl_sndbuf_min; 796extern unsigned long rds_sysctl_sndbuf_default; 797extern unsigned long rds_sysctl_sndbuf_max; 798extern unsigned long rds_sysctl_reconnect_min_jiffies; 799extern unsigned long rds_sysctl_reconnect_max_jiffies; 800extern unsigned int rds_sysctl_max_unacked_packets; 801extern unsigned int rds_sysctl_max_unacked_bytes; 802extern unsigned int rds_sysctl_ping_enable; 803extern unsigned long rds_sysctl_trace_flags; 804extern unsigned int rds_sysctl_trace_level; 805 806/* threads.c */ 807int rds_threads_init(void); 808void rds_threads_exit(void); 809extern struct workqueue_struct *rds_wq; 810void rds_queue_reconnect(struct rds_connection *conn); 811void rds_connect_worker(struct work_struct *); 812void rds_shutdown_worker(struct work_struct *); 813void rds_send_worker(struct work_struct *); 814void rds_recv_worker(struct work_struct *); 815void rds_connect_complete(struct rds_connection *conn); 816 817/* transport.c */ 818int rds_trans_register(struct rds_transport *trans); 819void rds_trans_unregister(struct rds_transport *trans); 820struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 821void rds_trans_put(struct rds_transport *trans); 822unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 823 unsigned int avail); 824struct rds_transport *rds_trans_get(int t_type); 825int rds_trans_init(void); 826void rds_trans_exit(void); 827 828#endif 829