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