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 __printf(1, 2) 40 void 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 56 struct 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 */ 71 enum { 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 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 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_flags; 114 unsigned long c_reconnect_jiffies; 115 struct delayed_work c_send_w; 116 struct delayed_work c_recv_w; 117 struct delayed_work c_conn_w; 118 struct work_struct c_down_w; 119 struct mutex c_cm_lock; /* protect conn state & cm */ 120 wait_queue_head_t c_waitq; 121 122 struct list_head c_map_item; 123 unsigned long c_map_queued; 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 255 136 137 /* 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 struct rds_mr { 210 struct rb_node r_rb_node; 211 atomic_t r_refcount; 212 u32 r_key; 213 214 /* A copy of the creation flags */ 215 unsigned int r_use_once:1; 216 unsigned int r_invalidate:1; 217 unsigned int r_write:1; 218 219 /* This is for RDS_MR_DEAD. 220 * It would be nice & consistent to make this part of the above 221 * bit field here, but we need to use test_and_set_bit. 222 */ 223 unsigned long r_state; 224 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 225 struct rds_transport *r_trans; 226 void *r_trans_private; 227 }; 228 229 /* Flags for mr->r_state */ 230 #define RDS_MR_DEAD 0 231 232 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 233 { 234 return r_key | (((u64) offset) << 32); 235 } 236 237 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 238 { 239 return cookie; 240 } 241 242 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 243 { 244 return cookie >> 32; 245 } 246 247 /* atomic operation types */ 248 #define RDS_ATOMIC_TYPE_CSWP 0 249 #define RDS_ATOMIC_TYPE_FADD 1 250 251 /* 252 * m_sock_item and m_conn_item are on lists that are serialized under 253 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 254 * the message will not be put back on the retransmit list after being sent. 255 * messages that are canceled while being sent rely on this. 256 * 257 * m_inc is used by loopback so that it can pass an incoming message straight 258 * back up into the rx path. It embeds a wire header which is also used by 259 * the send path, which is kind of awkward. 260 * 261 * m_sock_item indicates the message's presence on a socket's send or receive 262 * queue. m_rs will point to that socket. 263 * 264 * m_daddr is used by cancellation to prune messages to a given destination. 265 * 266 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 267 * nesting. As paths iterate over messages on a sock, or conn, they must 268 * also lock the conn, or sock, to remove the message from those lists too. 269 * Testing the flag to determine if the message is still on the lists lets 270 * us avoid testing the list_head directly. That means each path can use 271 * the message's list_head to keep it on a local list while juggling locks 272 * without confusing the other path. 273 * 274 * m_ack_seq is an optional field set by transports who need a different 275 * sequence number range to invalidate. They can use this in a callback 276 * that they pass to rds_send_drop_acked() to see if each message has been 277 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 278 * had ack_seq set yet. 279 */ 280 #define RDS_MSG_ON_SOCK 1 281 #define RDS_MSG_ON_CONN 2 282 #define RDS_MSG_HAS_ACK_SEQ 3 283 #define RDS_MSG_ACK_REQUIRED 4 284 #define RDS_MSG_RETRANSMITTED 5 285 #define RDS_MSG_MAPPED 6 286 #define RDS_MSG_PAGEVEC 7 287 288 struct rds_message { 289 atomic_t m_refcount; 290 struct list_head m_sock_item; 291 struct list_head m_conn_item; 292 struct rds_incoming m_inc; 293 u64 m_ack_seq; 294 __be32 m_daddr; 295 unsigned long m_flags; 296 297 /* Never access m_rs without holding m_rs_lock. 298 * Lock nesting is 299 * rm->m_rs_lock 300 * -> rs->rs_lock 301 */ 302 spinlock_t m_rs_lock; 303 wait_queue_head_t m_flush_wait; 304 305 struct rds_sock *m_rs; 306 307 /* cookie to send to remote, in rds header */ 308 rds_rdma_cookie_t m_rdma_cookie; 309 310 unsigned int m_used_sgs; 311 unsigned int m_total_sgs; 312 313 void *m_final_op; 314 315 struct { 316 struct rm_atomic_op { 317 int op_type; 318 union { 319 struct { 320 uint64_t compare; 321 uint64_t swap; 322 uint64_t compare_mask; 323 uint64_t swap_mask; 324 } op_m_cswp; 325 struct { 326 uint64_t add; 327 uint64_t nocarry_mask; 328 } op_m_fadd; 329 }; 330 331 u32 op_rkey; 332 u64 op_remote_addr; 333 unsigned int op_notify:1; 334 unsigned int op_recverr:1; 335 unsigned int op_mapped:1; 336 unsigned int op_silent:1; 337 unsigned int op_active:1; 338 struct scatterlist *op_sg; 339 struct rds_notifier *op_notifier; 340 341 struct rds_mr *op_rdma_mr; 342 } atomic; 343 struct rm_rdma_op { 344 u32 op_rkey; 345 u64 op_remote_addr; 346 unsigned int op_write:1; 347 unsigned int op_fence:1; 348 unsigned int op_notify:1; 349 unsigned int op_recverr:1; 350 unsigned int op_mapped:1; 351 unsigned int op_silent:1; 352 unsigned int op_active:1; 353 unsigned int op_bytes; 354 unsigned int op_nents; 355 unsigned int op_count; 356 struct scatterlist *op_sg; 357 struct rds_notifier *op_notifier; 358 359 struct rds_mr *op_rdma_mr; 360 } rdma; 361 struct rm_data_op { 362 unsigned int op_active:1; 363 unsigned int op_nents; 364 unsigned int op_count; 365 struct scatterlist *op_sg; 366 } data; 367 }; 368 }; 369 370 /* 371 * The RDS notifier is used (optionally) to tell the application about 372 * completed RDMA operations. Rather than keeping the whole rds message 373 * around on the queue, we allocate a small notifier that is put on the 374 * socket's notifier_list. Notifications are delivered to the application 375 * through control messages. 376 */ 377 struct rds_notifier { 378 struct list_head n_list; 379 uint64_t n_user_token; 380 int n_status; 381 }; 382 383 /** 384 * struct rds_transport - transport specific behavioural hooks 385 * 386 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 387 * part of a message. The caller serializes on the send_sem so this 388 * doesn't need to be reentrant for a given conn. The header must be 389 * sent before the data payload. .xmit must be prepared to send a 390 * message with no data payload. .xmit should return the number of 391 * bytes that were sent down the connection, including header bytes. 392 * Returning 0 tells the caller that it doesn't need to perform any 393 * additional work now. This is usually the case when the transport has 394 * filled the sending queue for its connection and will handle 395 * triggering the rds thread to continue the send when space becomes 396 * available. Returning -EAGAIN tells the caller to retry the send 397 * immediately. Returning -ENOMEM tells the caller to retry the send at 398 * some point in the future. 399 * 400 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 401 * it returns the connection can not call rds_recv_incoming(). 402 * This will only be called once after conn_connect returns 403 * non-zero success and will The caller serializes this with 404 * the send and connecting paths (xmit_* and conn_*). The 405 * transport is responsible for other serialization, including 406 * rds_recv_incoming(). This is called in process context but 407 * should try hard not to block. 408 */ 409 410 #define RDS_TRANS_IB 0 411 #define RDS_TRANS_IWARP 1 412 #define RDS_TRANS_TCP 2 413 #define RDS_TRANS_COUNT 3 414 415 struct rds_transport { 416 char t_name[TRANSNAMSIZ]; 417 struct list_head t_item; 418 struct module *t_owner; 419 unsigned int t_prefer_loopback:1; 420 unsigned int t_type; 421 422 int (*laddr_check)(__be32 addr); 423 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 424 void (*conn_free)(void *data); 425 int (*conn_connect)(struct rds_connection *conn); 426 void (*conn_shutdown)(struct rds_connection *conn); 427 void (*xmit_prepare)(struct rds_connection *conn); 428 void (*xmit_complete)(struct rds_connection *conn); 429 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 430 unsigned int hdr_off, unsigned int sg, unsigned int off); 431 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 432 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 433 int (*recv)(struct rds_connection *conn); 434 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov, 435 size_t size); 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 }; 453 454 struct 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 }; 517 518 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 519 { 520 return container_of(sk, struct rds_sock, rs_sk); 521 } 522 static 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 */ 532 static inline int rds_sk_sndbuf(struct rds_sock *rs) 533 { 534 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 535 } 536 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 537 { 538 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 539 } 540 541 struct 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 */ 578 char *rds_str_array(char **array, size_t elements, size_t index); 579 void rds_sock_addref(struct rds_sock *rs); 580 void rds_sock_put(struct rds_sock *rs); 581 void rds_wake_sk_sleep(struct rds_sock *rs); 582 static 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 } 589 extern wait_queue_head_t rds_poll_waitq; 590 591 592 /* bind.c */ 593 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 594 void rds_remove_bound(struct rds_sock *rs); 595 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 596 597 /* cong.c */ 598 int rds_cong_get_maps(struct rds_connection *conn); 599 void rds_cong_add_conn(struct rds_connection *conn); 600 void rds_cong_remove_conn(struct rds_connection *conn); 601 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 602 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 603 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 604 void rds_cong_queue_updates(struct rds_cong_map *map); 605 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 606 int rds_cong_updated_since(unsigned long *recent); 607 void rds_cong_add_socket(struct rds_sock *); 608 void rds_cong_remove_socket(struct rds_sock *); 609 void rds_cong_exit(void); 610 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 611 612 /* conn.c */ 613 int rds_conn_init(void); 614 void rds_conn_exit(void); 615 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, 616 struct rds_transport *trans, gfp_t gfp); 617 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, 618 struct rds_transport *trans, gfp_t gfp); 619 void rds_conn_shutdown(struct rds_connection *conn); 620 void rds_conn_destroy(struct rds_connection *conn); 621 void rds_conn_drop(struct rds_connection *conn); 622 void rds_conn_connect_if_down(struct rds_connection *conn); 623 void 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) 629 void __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) 632 633 static inline int 634 rds_conn_transition(struct rds_connection *conn, int old, int new) 635 { 636 return atomic_cmpxchg(&conn->c_state, old, new) == old; 637 } 638 639 static inline int 640 rds_conn_state(struct rds_connection *conn) 641 { 642 return atomic_read(&conn->c_state); 643 } 644 645 static inline int 646 rds_conn_up(struct rds_connection *conn) 647 { 648 return atomic_read(&conn->c_state) == RDS_CONN_UP; 649 } 650 651 static inline int 652 rds_conn_connecting(struct rds_connection *conn) 653 { 654 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; 655 } 656 657 /* message.c */ 658 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 659 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 660 int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov, 661 size_t total_len); 662 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 663 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 664 __be16 dport, u64 seq); 665 int rds_message_add_extension(struct rds_header *hdr, 666 unsigned int type, const void *data, unsigned int len); 667 int rds_message_next_extension(struct rds_header *hdr, 668 unsigned int *pos, void *buf, unsigned int *buflen); 669 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 670 int rds_message_inc_copy_to_user(struct rds_incoming *inc, 671 struct iovec *first_iov, size_t size); 672 void rds_message_inc_free(struct rds_incoming *inc); 673 void rds_message_addref(struct rds_message *rm); 674 void rds_message_put(struct rds_message *rm); 675 void rds_message_wait(struct rds_message *rm); 676 void rds_message_unmapped(struct rds_message *rm); 677 678 static inline void rds_message_make_checksum(struct rds_header *hdr) 679 { 680 hdr->h_csum = 0; 681 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 682 } 683 684 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 685 { 686 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 687 } 688 689 690 /* page.c */ 691 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 692 gfp_t gfp); 693 int rds_page_copy_user(struct page *page, unsigned long offset, 694 void __user *ptr, unsigned long bytes, 695 int to_user); 696 #define rds_page_copy_to_user(page, offset, ptr, bytes) \ 697 rds_page_copy_user(page, offset, ptr, bytes, 1) 698 #define rds_page_copy_from_user(page, offset, ptr, bytes) \ 699 rds_page_copy_user(page, offset, ptr, bytes, 0) 700 void rds_page_exit(void); 701 702 /* recv.c */ 703 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 704 __be32 saddr); 705 void rds_inc_put(struct rds_incoming *inc); 706 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 707 struct rds_incoming *inc, gfp_t gfp); 708 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 709 size_t size, int msg_flags); 710 void rds_clear_recv_queue(struct rds_sock *rs); 711 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 712 void rds_inc_info_copy(struct rds_incoming *inc, 713 struct rds_info_iterator *iter, 714 __be32 saddr, __be32 daddr, int flip); 715 716 /* send.c */ 717 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 718 size_t payload_len); 719 void rds_send_reset(struct rds_connection *conn); 720 int rds_send_xmit(struct rds_connection *conn); 721 struct sockaddr_in; 722 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 723 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 724 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 725 is_acked_func is_acked); 726 int rds_send_pong(struct rds_connection *conn, __be16 dport); 727 struct rds_message *rds_send_get_message(struct rds_connection *, 728 struct rm_rdma_op *); 729 730 /* rdma.c */ 731 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 732 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 733 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 734 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 735 void rds_rdma_drop_keys(struct rds_sock *rs); 736 int rds_rdma_extra_size(struct rds_rdma_args *args); 737 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 738 struct cmsghdr *cmsg); 739 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 740 struct cmsghdr *cmsg); 741 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 742 struct cmsghdr *cmsg); 743 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 744 struct cmsghdr *cmsg); 745 void rds_rdma_free_op(struct rm_rdma_op *ro); 746 void rds_atomic_free_op(struct rm_atomic_op *ao); 747 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 748 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 749 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 750 struct cmsghdr *cmsg); 751 752 extern void __rds_put_mr_final(struct rds_mr *mr); 753 static inline void rds_mr_put(struct rds_mr *mr) 754 { 755 if (atomic_dec_and_test(&mr->r_refcount)) 756 __rds_put_mr_final(mr); 757 } 758 759 /* stats.c */ 760 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 761 #define rds_stats_inc_which(which, member) do { \ 762 per_cpu(which, get_cpu()).member++; \ 763 put_cpu(); \ 764 } while (0) 765 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 766 #define rds_stats_add_which(which, member, count) do { \ 767 per_cpu(which, get_cpu()).member += count; \ 768 put_cpu(); \ 769 } while (0) 770 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 771 int rds_stats_init(void); 772 void rds_stats_exit(void); 773 void rds_stats_info_copy(struct rds_info_iterator *iter, 774 uint64_t *values, const char *const *names, 775 size_t nr); 776 777 /* sysctl.c */ 778 int rds_sysctl_init(void); 779 void rds_sysctl_exit(void); 780 extern unsigned long rds_sysctl_sndbuf_min; 781 extern unsigned long rds_sysctl_sndbuf_default; 782 extern unsigned long rds_sysctl_sndbuf_max; 783 extern unsigned long rds_sysctl_reconnect_min_jiffies; 784 extern unsigned long rds_sysctl_reconnect_max_jiffies; 785 extern unsigned int rds_sysctl_max_unacked_packets; 786 extern unsigned int rds_sysctl_max_unacked_bytes; 787 extern unsigned int rds_sysctl_ping_enable; 788 extern unsigned long rds_sysctl_trace_flags; 789 extern unsigned int rds_sysctl_trace_level; 790 791 /* threads.c */ 792 int rds_threads_init(void); 793 void rds_threads_exit(void); 794 extern struct workqueue_struct *rds_wq; 795 void rds_queue_reconnect(struct rds_connection *conn); 796 void rds_connect_worker(struct work_struct *); 797 void rds_shutdown_worker(struct work_struct *); 798 void rds_send_worker(struct work_struct *); 799 void rds_recv_worker(struct work_struct *); 800 void rds_connect_complete(struct rds_connection *conn); 801 802 /* transport.c */ 803 int rds_trans_register(struct rds_transport *trans); 804 void rds_trans_unregister(struct rds_transport *trans); 805 struct rds_transport *rds_trans_get_preferred(__be32 addr); 806 void rds_trans_put(struct rds_transport *trans); 807 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 808 unsigned int avail); 809 int rds_trans_init(void); 810 void rds_trans_exit(void); 811 812 #endif 813