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 RDS_DEBUG 37 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 38 #else 39 /* sigh, pr_debug() causes unused variable warnings */ 40 static inline __printf(1, 2) 41 void 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 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ 54 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) 55 56 #define RDS_CONG_MAP_BYTES (65536 / 8) 57 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 58 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 59 60 struct rds_cong_map { 61 struct rb_node m_rb_node; 62 __be32 m_addr; 63 wait_queue_head_t m_waitq; 64 struct list_head m_conn_list; 65 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 66 }; 67 68 69 /* 70 * This is how we will track the connection state: 71 * A connection is always in one of the following 72 * states. Updates to the state are atomic and imply 73 * a memory barrier. 74 */ 75 enum { 76 RDS_CONN_DOWN = 0, 77 RDS_CONN_CONNECTING, 78 RDS_CONN_DISCONNECTING, 79 RDS_CONN_UP, 80 RDS_CONN_RESETTING, 81 RDS_CONN_ERROR, 82 }; 83 84 /* Bits for c_flags */ 85 #define RDS_LL_SEND_FULL 0 86 #define RDS_RECONNECT_PENDING 1 87 #define RDS_IN_XMIT 2 88 #define RDS_RECV_REFILL 3 89 90 /* Max number of multipaths per RDS connection. Must be a power of 2 */ 91 #define RDS_MPATH_WORKERS 8 92 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ 93 (rs)->rs_hash_initval) & ((n) - 1)) 94 95 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) 96 97 /* Per mpath connection state */ 98 struct rds_conn_path { 99 struct rds_connection *cp_conn; 100 struct rds_message *cp_xmit_rm; 101 unsigned long cp_xmit_sg; 102 unsigned int cp_xmit_hdr_off; 103 unsigned int cp_xmit_data_off; 104 unsigned int cp_xmit_atomic_sent; 105 unsigned int cp_xmit_rdma_sent; 106 unsigned int cp_xmit_data_sent; 107 108 spinlock_t cp_lock; /* protect msg queues */ 109 u64 cp_next_tx_seq; 110 struct list_head cp_send_queue; 111 struct list_head cp_retrans; 112 113 u64 cp_next_rx_seq; 114 115 void *cp_transport_data; 116 117 atomic_t cp_state; 118 unsigned long cp_send_gen; 119 unsigned long cp_flags; 120 unsigned long cp_reconnect_jiffies; 121 struct delayed_work cp_send_w; 122 struct delayed_work cp_recv_w; 123 struct delayed_work cp_conn_w; 124 struct work_struct cp_down_w; 125 struct mutex cp_cm_lock; /* protect cp_state & cm */ 126 wait_queue_head_t cp_waitq; 127 128 unsigned int cp_unacked_packets; 129 unsigned int cp_unacked_bytes; 130 unsigned int cp_index; 131 }; 132 133 /* One rds_connection per RDS address pair */ 134 struct rds_connection { 135 struct hlist_node c_hash_node; 136 __be32 c_laddr; 137 __be32 c_faddr; 138 unsigned int c_loopback:1, 139 c_ping_triggered:1, 140 c_destroy_in_prog:1, 141 c_pad_to_32:29; 142 int c_npaths; 143 struct rds_connection *c_passive; 144 struct rds_transport *c_trans; 145 146 struct rds_cong_map *c_lcong; 147 struct rds_cong_map *c_fcong; 148 149 /* Protocol version */ 150 unsigned int c_version; 151 struct net *c_net; 152 153 struct list_head c_map_item; 154 unsigned long c_map_queued; 155 156 struct rds_conn_path c_path[RDS_MPATH_WORKERS]; 157 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 158 159 u32 c_my_gen_num; 160 u32 c_peer_gen_num; 161 }; 162 163 static inline 164 struct net *rds_conn_net(struct rds_connection *conn) 165 { 166 return conn->c_net; 167 } 168 169 static inline 170 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 171 { 172 conn->c_net = get_net(net); 173 } 174 175 #define RDS_FLAG_CONG_BITMAP 0x01 176 #define RDS_FLAG_ACK_REQUIRED 0x02 177 #define RDS_FLAG_RETRANSMITTED 0x04 178 #define RDS_MAX_ADV_CREDIT 255 179 180 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 181 * probe to exchange control information before establishing a connection. 182 * Currently the control information that is exchanged is the number of 183 * supported paths. If the peer is a legacy (older kernel revision) peer, 184 * it would return a pong message without additional control information 185 * that would then alert the sender that the peer was an older rev. 186 */ 187 #define RDS_FLAG_PROBE_PORT 1 188 #define RDS_HS_PROBE(sport, dport) \ 189 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 190 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 191 /* 192 * Maximum space available for extension headers. 193 */ 194 #define RDS_HEADER_EXT_SPACE 16 195 196 struct rds_header { 197 __be64 h_sequence; 198 __be64 h_ack; 199 __be32 h_len; 200 __be16 h_sport; 201 __be16 h_dport; 202 u8 h_flags; 203 u8 h_credit; 204 u8 h_padding[4]; 205 __sum16 h_csum; 206 207 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 208 }; 209 210 /* 211 * Reserved - indicates end of extensions 212 */ 213 #define RDS_EXTHDR_NONE 0 214 215 /* 216 * This extension header is included in the very 217 * first message that is sent on a new connection, 218 * and identifies the protocol level. This will help 219 * rolling updates if a future change requires breaking 220 * the protocol. 221 * NB: This is no longer true for IB, where we do a version 222 * negotiation during the connection setup phase (protocol 223 * version information is included in the RDMA CM private data). 224 */ 225 #define RDS_EXTHDR_VERSION 1 226 struct rds_ext_header_version { 227 __be32 h_version; 228 }; 229 230 /* 231 * This extension header is included in the RDS message 232 * chasing an RDMA operation. 233 */ 234 #define RDS_EXTHDR_RDMA 2 235 struct rds_ext_header_rdma { 236 __be32 h_rdma_rkey; 237 }; 238 239 /* 240 * This extension header tells the peer about the 241 * destination <R_Key,offset> of the requested RDMA 242 * operation. 243 */ 244 #define RDS_EXTHDR_RDMA_DEST 3 245 struct rds_ext_header_rdma_dest { 246 __be32 h_rdma_rkey; 247 __be32 h_rdma_offset; 248 }; 249 250 /* Extension header announcing number of paths. 251 * Implicit length = 2 bytes. 252 */ 253 #define RDS_EXTHDR_NPATHS 5 254 #define RDS_EXTHDR_GEN_NUM 6 255 256 #define __RDS_EXTHDR_MAX 16 /* for now */ 257 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) 258 #define RDS_MSG_RX_HDR 0 259 #define RDS_MSG_RX_START 1 260 #define RDS_MSG_RX_END 2 261 #define RDS_MSG_RX_CMSG 3 262 263 struct rds_incoming { 264 atomic_t i_refcount; 265 struct list_head i_item; 266 struct rds_connection *i_conn; 267 struct rds_conn_path *i_conn_path; 268 struct rds_header i_hdr; 269 unsigned long i_rx_jiffies; 270 __be32 i_saddr; 271 272 rds_rdma_cookie_t i_rdma_cookie; 273 struct timeval i_rx_tstamp; 274 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 275 }; 276 277 struct rds_mr { 278 struct rb_node r_rb_node; 279 atomic_t r_refcount; 280 u32 r_key; 281 282 /* A copy of the creation flags */ 283 unsigned int r_use_once:1; 284 unsigned int r_invalidate:1; 285 unsigned int r_write:1; 286 287 /* This is for RDS_MR_DEAD. 288 * It would be nice & consistent to make this part of the above 289 * bit field here, but we need to use test_and_set_bit. 290 */ 291 unsigned long r_state; 292 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 293 struct rds_transport *r_trans; 294 void *r_trans_private; 295 }; 296 297 /* Flags for mr->r_state */ 298 #define RDS_MR_DEAD 0 299 300 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 301 { 302 return r_key | (((u64) offset) << 32); 303 } 304 305 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 306 { 307 return cookie; 308 } 309 310 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 311 { 312 return cookie >> 32; 313 } 314 315 /* atomic operation types */ 316 #define RDS_ATOMIC_TYPE_CSWP 0 317 #define RDS_ATOMIC_TYPE_FADD 1 318 319 /* 320 * m_sock_item and m_conn_item are on lists that are serialized under 321 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 322 * the message will not be put back on the retransmit list after being sent. 323 * messages that are canceled while being sent rely on this. 324 * 325 * m_inc is used by loopback so that it can pass an incoming message straight 326 * back up into the rx path. It embeds a wire header which is also used by 327 * the send path, which is kind of awkward. 328 * 329 * m_sock_item indicates the message's presence on a socket's send or receive 330 * queue. m_rs will point to that socket. 331 * 332 * m_daddr is used by cancellation to prune messages to a given destination. 333 * 334 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 335 * nesting. As paths iterate over messages on a sock, or conn, they must 336 * also lock the conn, or sock, to remove the message from those lists too. 337 * Testing the flag to determine if the message is still on the lists lets 338 * us avoid testing the list_head directly. That means each path can use 339 * the message's list_head to keep it on a local list while juggling locks 340 * without confusing the other path. 341 * 342 * m_ack_seq is an optional field set by transports who need a different 343 * sequence number range to invalidate. They can use this in a callback 344 * that they pass to rds_send_drop_acked() to see if each message has been 345 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 346 * had ack_seq set yet. 347 */ 348 #define RDS_MSG_ON_SOCK 1 349 #define RDS_MSG_ON_CONN 2 350 #define RDS_MSG_HAS_ACK_SEQ 3 351 #define RDS_MSG_ACK_REQUIRED 4 352 #define RDS_MSG_RETRANSMITTED 5 353 #define RDS_MSG_MAPPED 6 354 #define RDS_MSG_PAGEVEC 7 355 #define RDS_MSG_FLUSH 8 356 357 struct rds_message { 358 atomic_t m_refcount; 359 struct list_head m_sock_item; 360 struct list_head m_conn_item; 361 struct rds_incoming m_inc; 362 u64 m_ack_seq; 363 __be32 m_daddr; 364 unsigned long m_flags; 365 366 /* Never access m_rs without holding m_rs_lock. 367 * Lock nesting is 368 * rm->m_rs_lock 369 * -> rs->rs_lock 370 */ 371 spinlock_t m_rs_lock; 372 wait_queue_head_t m_flush_wait; 373 374 struct rds_sock *m_rs; 375 376 /* cookie to send to remote, in rds header */ 377 rds_rdma_cookie_t m_rdma_cookie; 378 379 unsigned int m_used_sgs; 380 unsigned int m_total_sgs; 381 382 void *m_final_op; 383 384 struct { 385 struct rm_atomic_op { 386 int op_type; 387 union { 388 struct { 389 uint64_t compare; 390 uint64_t swap; 391 uint64_t compare_mask; 392 uint64_t swap_mask; 393 } op_m_cswp; 394 struct { 395 uint64_t add; 396 uint64_t nocarry_mask; 397 } op_m_fadd; 398 }; 399 400 u32 op_rkey; 401 u64 op_remote_addr; 402 unsigned int op_notify:1; 403 unsigned int op_recverr:1; 404 unsigned int op_mapped:1; 405 unsigned int op_silent:1; 406 unsigned int op_active:1; 407 struct scatterlist *op_sg; 408 struct rds_notifier *op_notifier; 409 410 struct rds_mr *op_rdma_mr; 411 } atomic; 412 struct rm_rdma_op { 413 u32 op_rkey; 414 u64 op_remote_addr; 415 unsigned int op_write:1; 416 unsigned int op_fence:1; 417 unsigned int op_notify:1; 418 unsigned int op_recverr:1; 419 unsigned int op_mapped:1; 420 unsigned int op_silent:1; 421 unsigned int op_active:1; 422 unsigned int op_bytes; 423 unsigned int op_nents; 424 unsigned int op_count; 425 struct scatterlist *op_sg; 426 struct rds_notifier *op_notifier; 427 428 struct rds_mr *op_rdma_mr; 429 } rdma; 430 struct rm_data_op { 431 unsigned int op_active:1; 432 unsigned int op_notify:1; 433 unsigned int op_nents; 434 unsigned int op_count; 435 unsigned int op_dmasg; 436 unsigned int op_dmaoff; 437 struct scatterlist *op_sg; 438 } data; 439 }; 440 }; 441 442 /* 443 * The RDS notifier is used (optionally) to tell the application about 444 * completed RDMA operations. Rather than keeping the whole rds message 445 * around on the queue, we allocate a small notifier that is put on the 446 * socket's notifier_list. Notifications are delivered to the application 447 * through control messages. 448 */ 449 struct rds_notifier { 450 struct list_head n_list; 451 uint64_t n_user_token; 452 int n_status; 453 }; 454 455 /** 456 * struct rds_transport - transport specific behavioural hooks 457 * 458 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 459 * part of a message. The caller serializes on the send_sem so this 460 * doesn't need to be reentrant for a given conn. The header must be 461 * sent before the data payload. .xmit must be prepared to send a 462 * message with no data payload. .xmit should return the number of 463 * bytes that were sent down the connection, including header bytes. 464 * Returning 0 tells the caller that it doesn't need to perform any 465 * additional work now. This is usually the case when the transport has 466 * filled the sending queue for its connection and will handle 467 * triggering the rds thread to continue the send when space becomes 468 * available. Returning -EAGAIN tells the caller to retry the send 469 * immediately. Returning -ENOMEM tells the caller to retry the send at 470 * some point in the future. 471 * 472 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 473 * it returns the connection can not call rds_recv_incoming(). 474 * This will only be called once after conn_connect returns 475 * non-zero success and will The caller serializes this with 476 * the send and connecting paths (xmit_* and conn_*). The 477 * transport is responsible for other serialization, including 478 * rds_recv_incoming(). This is called in process context but 479 * should try hard not to block. 480 */ 481 482 struct rds_transport { 483 char t_name[TRANSNAMSIZ]; 484 struct list_head t_item; 485 struct module *t_owner; 486 unsigned int t_prefer_loopback:1, 487 t_mp_capable:1; 488 unsigned int t_type; 489 490 int (*laddr_check)(struct net *net, __be32 addr); 491 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 492 void (*conn_free)(void *data); 493 int (*conn_path_connect)(struct rds_conn_path *cp); 494 void (*conn_path_shutdown)(struct rds_conn_path *conn); 495 void (*xmit_path_prepare)(struct rds_conn_path *cp); 496 void (*xmit_path_complete)(struct rds_conn_path *cp); 497 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 498 unsigned int hdr_off, unsigned int sg, unsigned int off); 499 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 500 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 501 int (*recv_path)(struct rds_conn_path *cp); 502 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 503 void (*inc_free)(struct rds_incoming *inc); 504 505 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 506 struct rdma_cm_event *event); 507 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 508 void (*cm_connect_complete)(struct rds_connection *conn, 509 struct rdma_cm_event *event); 510 511 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 512 unsigned int avail); 513 void (*exit)(void); 514 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 515 struct rds_sock *rs, u32 *key_ret); 516 void (*sync_mr)(void *trans_private, int direction); 517 void (*free_mr)(void *trans_private, int invalidate); 518 void (*flush_mrs)(void); 519 }; 520 521 struct rds_sock { 522 struct sock rs_sk; 523 524 u64 rs_user_addr; 525 u64 rs_user_bytes; 526 527 /* 528 * bound_addr used for both incoming and outgoing, no INADDR_ANY 529 * support. 530 */ 531 struct rhash_head rs_bound_node; 532 u64 rs_bound_key; 533 __be32 rs_bound_addr; 534 __be32 rs_conn_addr; 535 __be16 rs_bound_port; 536 __be16 rs_conn_port; 537 struct rds_transport *rs_transport; 538 539 /* 540 * rds_sendmsg caches the conn it used the last time around. 541 * This helps avoid costly lookups. 542 */ 543 struct rds_connection *rs_conn; 544 545 /* flag indicating we were congested or not */ 546 int rs_congested; 547 /* seen congestion (ENOBUFS) when sending? */ 548 int rs_seen_congestion; 549 550 /* rs_lock protects all these adjacent members before the newline */ 551 spinlock_t rs_lock; 552 struct list_head rs_send_queue; 553 u32 rs_snd_bytes; 554 int rs_rcv_bytes; 555 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 556 557 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 558 * to decide whether the application should be woken up. 559 * If not set, we use rs_cong_track to find out whether a cong map 560 * update arrived. 561 */ 562 uint64_t rs_cong_mask; 563 uint64_t rs_cong_notify; 564 struct list_head rs_cong_list; 565 unsigned long rs_cong_track; 566 567 /* 568 * rs_recv_lock protects the receive queue, and is 569 * used to serialize with rds_release. 570 */ 571 rwlock_t rs_recv_lock; 572 struct list_head rs_recv_queue; 573 574 /* just for stats reporting */ 575 struct list_head rs_item; 576 577 /* these have their own lock */ 578 spinlock_t rs_rdma_lock; 579 struct rb_root rs_rdma_keys; 580 581 /* Socket options - in case there will be more */ 582 unsigned char rs_recverr, 583 rs_cong_monitor; 584 u32 rs_hash_initval; 585 586 /* Socket receive path trace points*/ 587 u8 rs_rx_traces; 588 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 589 }; 590 591 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 592 { 593 return container_of(sk, struct rds_sock, rs_sk); 594 } 595 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 596 { 597 return &rs->rs_sk; 598 } 599 600 /* 601 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 602 * to account for overhead. We don't account for overhead, we just apply 603 * the number of payload bytes to the specified value. 604 */ 605 static inline int rds_sk_sndbuf(struct rds_sock *rs) 606 { 607 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 608 } 609 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 610 { 611 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 612 } 613 614 struct rds_statistics { 615 uint64_t s_conn_reset; 616 uint64_t s_recv_drop_bad_checksum; 617 uint64_t s_recv_drop_old_seq; 618 uint64_t s_recv_drop_no_sock; 619 uint64_t s_recv_drop_dead_sock; 620 uint64_t s_recv_deliver_raced; 621 uint64_t s_recv_delivered; 622 uint64_t s_recv_queued; 623 uint64_t s_recv_immediate_retry; 624 uint64_t s_recv_delayed_retry; 625 uint64_t s_recv_ack_required; 626 uint64_t s_recv_rdma_bytes; 627 uint64_t s_recv_ping; 628 uint64_t s_send_queue_empty; 629 uint64_t s_send_queue_full; 630 uint64_t s_send_lock_contention; 631 uint64_t s_send_lock_queue_raced; 632 uint64_t s_send_immediate_retry; 633 uint64_t s_send_delayed_retry; 634 uint64_t s_send_drop_acked; 635 uint64_t s_send_ack_required; 636 uint64_t s_send_queued; 637 uint64_t s_send_rdma; 638 uint64_t s_send_rdma_bytes; 639 uint64_t s_send_pong; 640 uint64_t s_page_remainder_hit; 641 uint64_t s_page_remainder_miss; 642 uint64_t s_copy_to_user; 643 uint64_t s_copy_from_user; 644 uint64_t s_cong_update_queued; 645 uint64_t s_cong_update_received; 646 uint64_t s_cong_send_error; 647 uint64_t s_cong_send_blocked; 648 uint64_t s_recv_bytes_added_to_socket; 649 uint64_t s_recv_bytes_removed_from_socket; 650 651 }; 652 653 /* af_rds.c */ 654 void rds_sock_addref(struct rds_sock *rs); 655 void rds_sock_put(struct rds_sock *rs); 656 void rds_wake_sk_sleep(struct rds_sock *rs); 657 static inline void __rds_wake_sk_sleep(struct sock *sk) 658 { 659 wait_queue_head_t *waitq = sk_sleep(sk); 660 661 if (!sock_flag(sk, SOCK_DEAD) && waitq) 662 wake_up(waitq); 663 } 664 extern wait_queue_head_t rds_poll_waitq; 665 666 667 /* bind.c */ 668 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 669 void rds_remove_bound(struct rds_sock *rs); 670 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 671 int rds_bind_lock_init(void); 672 void rds_bind_lock_destroy(void); 673 674 /* cong.c */ 675 int rds_cong_get_maps(struct rds_connection *conn); 676 void rds_cong_add_conn(struct rds_connection *conn); 677 void rds_cong_remove_conn(struct rds_connection *conn); 678 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 679 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 680 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 681 void rds_cong_queue_updates(struct rds_cong_map *map); 682 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 683 int rds_cong_updated_since(unsigned long *recent); 684 void rds_cong_add_socket(struct rds_sock *); 685 void rds_cong_remove_socket(struct rds_sock *); 686 void rds_cong_exit(void); 687 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 688 689 /* conn.c */ 690 extern u32 rds_gen_num; 691 int rds_conn_init(void); 692 void rds_conn_exit(void); 693 struct rds_connection *rds_conn_create(struct net *net, 694 __be32 laddr, __be32 faddr, 695 struct rds_transport *trans, gfp_t gfp); 696 struct rds_connection *rds_conn_create_outgoing(struct net *net, 697 __be32 laddr, __be32 faddr, 698 struct rds_transport *trans, gfp_t gfp); 699 void rds_conn_shutdown(struct rds_conn_path *cpath); 700 void rds_conn_destroy(struct rds_connection *conn); 701 void rds_conn_drop(struct rds_connection *conn); 702 void rds_conn_path_drop(struct rds_conn_path *cpath); 703 void rds_conn_connect_if_down(struct rds_connection *conn); 704 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 705 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 706 struct rds_info_iterator *iter, 707 struct rds_info_lengths *lens, 708 int (*visitor)(struct rds_connection *, void *), 709 size_t item_len); 710 711 __printf(2, 3) 712 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 713 #define rds_conn_path_error(cp, fmt...) \ 714 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 715 716 static inline int 717 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 718 { 719 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 720 } 721 722 static inline int 723 rds_conn_transition(struct rds_connection *conn, int old, int new) 724 { 725 WARN_ON(conn->c_trans->t_mp_capable); 726 return rds_conn_path_transition(&conn->c_path[0], old, new); 727 } 728 729 static inline int 730 rds_conn_path_state(struct rds_conn_path *cp) 731 { 732 return atomic_read(&cp->cp_state); 733 } 734 735 static inline int 736 rds_conn_state(struct rds_connection *conn) 737 { 738 WARN_ON(conn->c_trans->t_mp_capable); 739 return rds_conn_path_state(&conn->c_path[0]); 740 } 741 742 static inline int 743 rds_conn_path_up(struct rds_conn_path *cp) 744 { 745 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 746 } 747 748 static inline int 749 rds_conn_up(struct rds_connection *conn) 750 { 751 WARN_ON(conn->c_trans->t_mp_capable); 752 return rds_conn_path_up(&conn->c_path[0]); 753 } 754 755 static inline int 756 rds_conn_path_connecting(struct rds_conn_path *cp) 757 { 758 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 759 } 760 761 static inline int 762 rds_conn_connecting(struct rds_connection *conn) 763 { 764 WARN_ON(conn->c_trans->t_mp_capable); 765 return rds_conn_path_connecting(&conn->c_path[0]); 766 } 767 768 /* message.c */ 769 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 770 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 771 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 772 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 773 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 774 __be16 dport, u64 seq); 775 int rds_message_add_extension(struct rds_header *hdr, 776 unsigned int type, const void *data, unsigned int len); 777 int rds_message_next_extension(struct rds_header *hdr, 778 unsigned int *pos, void *buf, unsigned int *buflen); 779 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 780 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 781 void rds_message_inc_free(struct rds_incoming *inc); 782 void rds_message_addref(struct rds_message *rm); 783 void rds_message_put(struct rds_message *rm); 784 void rds_message_wait(struct rds_message *rm); 785 void rds_message_unmapped(struct rds_message *rm); 786 787 static inline void rds_message_make_checksum(struct rds_header *hdr) 788 { 789 hdr->h_csum = 0; 790 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 791 } 792 793 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 794 { 795 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 796 } 797 798 799 /* page.c */ 800 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 801 gfp_t gfp); 802 void rds_page_exit(void); 803 804 /* recv.c */ 805 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 806 __be32 saddr); 807 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 808 __be32 saddr); 809 void rds_inc_put(struct rds_incoming *inc); 810 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 811 struct rds_incoming *inc, gfp_t gfp); 812 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 813 int msg_flags); 814 void rds_clear_recv_queue(struct rds_sock *rs); 815 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 816 void rds_inc_info_copy(struct rds_incoming *inc, 817 struct rds_info_iterator *iter, 818 __be32 saddr, __be32 daddr, int flip); 819 820 /* send.c */ 821 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 822 void rds_send_path_reset(struct rds_conn_path *conn); 823 int rds_send_xmit(struct rds_conn_path *cp); 824 struct sockaddr_in; 825 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 826 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 827 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 828 is_acked_func is_acked); 829 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 830 is_acked_func is_acked); 831 void rds_send_ping(struct rds_connection *conn, int cp_index); 832 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 833 834 /* rdma.c */ 835 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 836 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 837 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 838 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 839 void rds_rdma_drop_keys(struct rds_sock *rs); 840 int rds_rdma_extra_size(struct rds_rdma_args *args); 841 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 842 struct cmsghdr *cmsg); 843 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 844 struct cmsghdr *cmsg); 845 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 846 struct cmsghdr *cmsg); 847 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 848 struct cmsghdr *cmsg); 849 void rds_rdma_free_op(struct rm_rdma_op *ro); 850 void rds_atomic_free_op(struct rm_atomic_op *ao); 851 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 852 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 853 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 854 struct cmsghdr *cmsg); 855 856 void __rds_put_mr_final(struct rds_mr *mr); 857 static inline void rds_mr_put(struct rds_mr *mr) 858 { 859 if (atomic_dec_and_test(&mr->r_refcount)) 860 __rds_put_mr_final(mr); 861 } 862 863 /* stats.c */ 864 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 865 #define rds_stats_inc_which(which, member) do { \ 866 per_cpu(which, get_cpu()).member++; \ 867 put_cpu(); \ 868 } while (0) 869 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 870 #define rds_stats_add_which(which, member, count) do { \ 871 per_cpu(which, get_cpu()).member += count; \ 872 put_cpu(); \ 873 } while (0) 874 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 875 int rds_stats_init(void); 876 void rds_stats_exit(void); 877 void rds_stats_info_copy(struct rds_info_iterator *iter, 878 uint64_t *values, const char *const *names, 879 size_t nr); 880 881 /* sysctl.c */ 882 int rds_sysctl_init(void); 883 void rds_sysctl_exit(void); 884 extern unsigned long rds_sysctl_sndbuf_min; 885 extern unsigned long rds_sysctl_sndbuf_default; 886 extern unsigned long rds_sysctl_sndbuf_max; 887 extern unsigned long rds_sysctl_reconnect_min_jiffies; 888 extern unsigned long rds_sysctl_reconnect_max_jiffies; 889 extern unsigned int rds_sysctl_max_unacked_packets; 890 extern unsigned int rds_sysctl_max_unacked_bytes; 891 extern unsigned int rds_sysctl_ping_enable; 892 extern unsigned long rds_sysctl_trace_flags; 893 extern unsigned int rds_sysctl_trace_level; 894 895 /* threads.c */ 896 int rds_threads_init(void); 897 void rds_threads_exit(void); 898 extern struct workqueue_struct *rds_wq; 899 void rds_queue_reconnect(struct rds_conn_path *cp); 900 void rds_connect_worker(struct work_struct *); 901 void rds_shutdown_worker(struct work_struct *); 902 void rds_send_worker(struct work_struct *); 903 void rds_recv_worker(struct work_struct *); 904 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 905 void rds_connect_complete(struct rds_connection *conn); 906 907 /* transport.c */ 908 void rds_trans_register(struct rds_transport *trans); 909 void rds_trans_unregister(struct rds_transport *trans); 910 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 911 void rds_trans_put(struct rds_transport *trans); 912 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 913 unsigned int avail); 914 struct rds_transport *rds_trans_get(int t_type); 915 int rds_trans_init(void); 916 void rds_trans_exit(void); 917 918 #endif 919