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 */ 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 #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 57 struct 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 */ 72 enum { 73 RDS_CONN_DOWN = 0, 74 RDS_CONN_CONNECTING, 75 RDS_CONN_DISCONNECTING, 76 RDS_CONN_UP, 77 RDS_CONN_RESETTING, 78 RDS_CONN_ERROR, 79 }; 80 81 /* Bits for c_flags */ 82 #define RDS_LL_SEND_FULL 0 83 #define RDS_RECONNECT_PENDING 1 84 #define RDS_IN_XMIT 2 85 #define RDS_RECV_REFILL 3 86 87 /* Max number of multipaths per RDS connection. Must be a power of 2 */ 88 #define RDS_MPATH_WORKERS 8 89 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ 90 (rs)->rs_hash_initval) & ((n) - 1)) 91 92 /* Per mpath connection state */ 93 struct rds_conn_path { 94 struct rds_connection *cp_conn; 95 struct rds_message *cp_xmit_rm; 96 unsigned long cp_xmit_sg; 97 unsigned int cp_xmit_hdr_off; 98 unsigned int cp_xmit_data_off; 99 unsigned int cp_xmit_atomic_sent; 100 unsigned int cp_xmit_rdma_sent; 101 unsigned int cp_xmit_data_sent; 102 103 spinlock_t cp_lock; /* protect msg queues */ 104 u64 cp_next_tx_seq; 105 struct list_head cp_send_queue; 106 struct list_head cp_retrans; 107 108 u64 cp_next_rx_seq; 109 110 void *cp_transport_data; 111 112 atomic_t cp_state; 113 unsigned long cp_send_gen; 114 unsigned long cp_flags; 115 unsigned long cp_reconnect_jiffies; 116 struct delayed_work cp_send_w; 117 struct delayed_work cp_recv_w; 118 struct delayed_work cp_conn_w; 119 struct work_struct cp_down_w; 120 struct mutex cp_cm_lock; /* protect cp_state & cm */ 121 wait_queue_head_t cp_waitq; 122 123 unsigned int cp_unacked_packets; 124 unsigned int cp_unacked_bytes; 125 unsigned int cp_outgoing:1, 126 cp_pad_to_32:31; 127 unsigned int cp_index; 128 }; 129 130 /* One rds_connection per RDS address pair */ 131 struct rds_connection { 132 struct hlist_node c_hash_node; 133 __be32 c_laddr; 134 __be32 c_faddr; 135 unsigned int c_loopback:1, 136 c_ping_triggered:1, 137 c_pad_to_32:30; 138 int c_npaths; 139 struct rds_connection *c_passive; 140 struct rds_transport *c_trans; 141 142 struct rds_cong_map *c_lcong; 143 struct rds_cong_map *c_fcong; 144 145 /* Protocol version */ 146 unsigned int c_version; 147 possible_net_t c_net; 148 149 struct list_head c_map_item; 150 unsigned long c_map_queued; 151 152 struct rds_conn_path c_path[RDS_MPATH_WORKERS]; 153 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 154 }; 155 156 static inline 157 struct net *rds_conn_net(struct rds_connection *conn) 158 { 159 return read_pnet(&conn->c_net); 160 } 161 162 static inline 163 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 164 { 165 write_pnet(&conn->c_net, net); 166 } 167 168 #define RDS_FLAG_CONG_BITMAP 0x01 169 #define RDS_FLAG_ACK_REQUIRED 0x02 170 #define RDS_FLAG_RETRANSMITTED 0x04 171 #define RDS_MAX_ADV_CREDIT 255 172 173 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 174 * probe to exchange control information before establishing a connection. 175 * Currently the control information that is exchanged is the number of 176 * supported paths. If the peer is a legacy (older kernel revision) peer, 177 * it would return a pong message without additional control information 178 * that would then alert the sender that the peer was an older rev. 179 */ 180 #define RDS_FLAG_PROBE_PORT 1 181 #define RDS_HS_PROBE(sport, dport) \ 182 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 183 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 184 /* 185 * Maximum space available for extension headers. 186 */ 187 #define RDS_HEADER_EXT_SPACE 16 188 189 struct rds_header { 190 __be64 h_sequence; 191 __be64 h_ack; 192 __be32 h_len; 193 __be16 h_sport; 194 __be16 h_dport; 195 u8 h_flags; 196 u8 h_credit; 197 u8 h_padding[4]; 198 __sum16 h_csum; 199 200 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 201 }; 202 203 /* 204 * Reserved - indicates end of extensions 205 */ 206 #define RDS_EXTHDR_NONE 0 207 208 /* 209 * This extension header is included in the very 210 * first message that is sent on a new connection, 211 * and identifies the protocol level. This will help 212 * rolling updates if a future change requires breaking 213 * the protocol. 214 * NB: This is no longer true for IB, where we do a version 215 * negotiation during the connection setup phase (protocol 216 * version information is included in the RDMA CM private data). 217 */ 218 #define RDS_EXTHDR_VERSION 1 219 struct rds_ext_header_version { 220 __be32 h_version; 221 }; 222 223 /* 224 * This extension header is included in the RDS message 225 * chasing an RDMA operation. 226 */ 227 #define RDS_EXTHDR_RDMA 2 228 struct rds_ext_header_rdma { 229 __be32 h_rdma_rkey; 230 }; 231 232 /* 233 * This extension header tells the peer about the 234 * destination <R_Key,offset> of the requested RDMA 235 * operation. 236 */ 237 #define RDS_EXTHDR_RDMA_DEST 3 238 struct rds_ext_header_rdma_dest { 239 __be32 h_rdma_rkey; 240 __be32 h_rdma_offset; 241 }; 242 243 /* Extension header announcing number of paths. 244 * Implicit length = 2 bytes. 245 */ 246 #define RDS_EXTHDR_NPATHS 4 247 248 #define __RDS_EXTHDR_MAX 16 /* for now */ 249 250 struct rds_incoming { 251 atomic_t i_refcount; 252 struct list_head i_item; 253 struct rds_connection *i_conn; 254 struct rds_conn_path *i_conn_path; 255 struct rds_header i_hdr; 256 unsigned long i_rx_jiffies; 257 __be32 i_saddr; 258 259 rds_rdma_cookie_t i_rdma_cookie; 260 struct timeval i_rx_tstamp; 261 }; 262 263 struct rds_mr { 264 struct rb_node r_rb_node; 265 atomic_t r_refcount; 266 u32 r_key; 267 268 /* A copy of the creation flags */ 269 unsigned int r_use_once:1; 270 unsigned int r_invalidate:1; 271 unsigned int r_write:1; 272 273 /* This is for RDS_MR_DEAD. 274 * It would be nice & consistent to make this part of the above 275 * bit field here, but we need to use test_and_set_bit. 276 */ 277 unsigned long r_state; 278 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 279 struct rds_transport *r_trans; 280 void *r_trans_private; 281 }; 282 283 /* Flags for mr->r_state */ 284 #define RDS_MR_DEAD 0 285 286 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 287 { 288 return r_key | (((u64) offset) << 32); 289 } 290 291 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 292 { 293 return cookie; 294 } 295 296 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 297 { 298 return cookie >> 32; 299 } 300 301 /* atomic operation types */ 302 #define RDS_ATOMIC_TYPE_CSWP 0 303 #define RDS_ATOMIC_TYPE_FADD 1 304 305 /* 306 * m_sock_item and m_conn_item are on lists that are serialized under 307 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 308 * the message will not be put back on the retransmit list after being sent. 309 * messages that are canceled while being sent rely on this. 310 * 311 * m_inc is used by loopback so that it can pass an incoming message straight 312 * back up into the rx path. It embeds a wire header which is also used by 313 * the send path, which is kind of awkward. 314 * 315 * m_sock_item indicates the message's presence on a socket's send or receive 316 * queue. m_rs will point to that socket. 317 * 318 * m_daddr is used by cancellation to prune messages to a given destination. 319 * 320 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 321 * nesting. As paths iterate over messages on a sock, or conn, they must 322 * also lock the conn, or sock, to remove the message from those lists too. 323 * Testing the flag to determine if the message is still on the lists lets 324 * us avoid testing the list_head directly. That means each path can use 325 * the message's list_head to keep it on a local list while juggling locks 326 * without confusing the other path. 327 * 328 * m_ack_seq is an optional field set by transports who need a different 329 * sequence number range to invalidate. They can use this in a callback 330 * that they pass to rds_send_drop_acked() to see if each message has been 331 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 332 * had ack_seq set yet. 333 */ 334 #define RDS_MSG_ON_SOCK 1 335 #define RDS_MSG_ON_CONN 2 336 #define RDS_MSG_HAS_ACK_SEQ 3 337 #define RDS_MSG_ACK_REQUIRED 4 338 #define RDS_MSG_RETRANSMITTED 5 339 #define RDS_MSG_MAPPED 6 340 #define RDS_MSG_PAGEVEC 7 341 342 struct rds_message { 343 atomic_t m_refcount; 344 struct list_head m_sock_item; 345 struct list_head m_conn_item; 346 struct rds_incoming m_inc; 347 u64 m_ack_seq; 348 __be32 m_daddr; 349 unsigned long m_flags; 350 351 /* Never access m_rs without holding m_rs_lock. 352 * Lock nesting is 353 * rm->m_rs_lock 354 * -> rs->rs_lock 355 */ 356 spinlock_t m_rs_lock; 357 wait_queue_head_t m_flush_wait; 358 359 struct rds_sock *m_rs; 360 361 /* cookie to send to remote, in rds header */ 362 rds_rdma_cookie_t m_rdma_cookie; 363 364 unsigned int m_used_sgs; 365 unsigned int m_total_sgs; 366 367 void *m_final_op; 368 369 struct { 370 struct rm_atomic_op { 371 int op_type; 372 union { 373 struct { 374 uint64_t compare; 375 uint64_t swap; 376 uint64_t compare_mask; 377 uint64_t swap_mask; 378 } op_m_cswp; 379 struct { 380 uint64_t add; 381 uint64_t nocarry_mask; 382 } op_m_fadd; 383 }; 384 385 u32 op_rkey; 386 u64 op_remote_addr; 387 unsigned int op_notify:1; 388 unsigned int op_recverr:1; 389 unsigned int op_mapped:1; 390 unsigned int op_silent:1; 391 unsigned int op_active:1; 392 struct scatterlist *op_sg; 393 struct rds_notifier *op_notifier; 394 395 struct rds_mr *op_rdma_mr; 396 } atomic; 397 struct rm_rdma_op { 398 u32 op_rkey; 399 u64 op_remote_addr; 400 unsigned int op_write:1; 401 unsigned int op_fence:1; 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 unsigned int op_bytes; 408 unsigned int op_nents; 409 unsigned int op_count; 410 struct scatterlist *op_sg; 411 struct rds_notifier *op_notifier; 412 413 struct rds_mr *op_rdma_mr; 414 } rdma; 415 struct rm_data_op { 416 unsigned int op_active:1; 417 unsigned int op_nents; 418 unsigned int op_count; 419 unsigned int op_dmasg; 420 unsigned int op_dmaoff; 421 struct scatterlist *op_sg; 422 } data; 423 }; 424 }; 425 426 /* 427 * The RDS notifier is used (optionally) to tell the application about 428 * completed RDMA operations. Rather than keeping the whole rds message 429 * around on the queue, we allocate a small notifier that is put on the 430 * socket's notifier_list. Notifications are delivered to the application 431 * through control messages. 432 */ 433 struct rds_notifier { 434 struct list_head n_list; 435 uint64_t n_user_token; 436 int n_status; 437 }; 438 439 /** 440 * struct rds_transport - transport specific behavioural hooks 441 * 442 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 443 * part of a message. The caller serializes on the send_sem so this 444 * doesn't need to be reentrant for a given conn. The header must be 445 * sent before the data payload. .xmit must be prepared to send a 446 * message with no data payload. .xmit should return the number of 447 * bytes that were sent down the connection, including header bytes. 448 * Returning 0 tells the caller that it doesn't need to perform any 449 * additional work now. This is usually the case when the transport has 450 * filled the sending queue for its connection and will handle 451 * triggering the rds thread to continue the send when space becomes 452 * available. Returning -EAGAIN tells the caller to retry the send 453 * immediately. Returning -ENOMEM tells the caller to retry the send at 454 * some point in the future. 455 * 456 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 457 * it returns the connection can not call rds_recv_incoming(). 458 * This will only be called once after conn_connect returns 459 * non-zero success and will The caller serializes this with 460 * the send and connecting paths (xmit_* and conn_*). The 461 * transport is responsible for other serialization, including 462 * rds_recv_incoming(). This is called in process context but 463 * should try hard not to block. 464 */ 465 466 struct rds_transport { 467 char t_name[TRANSNAMSIZ]; 468 struct list_head t_item; 469 struct module *t_owner; 470 unsigned int t_prefer_loopback:1, 471 t_mp_capable:1; 472 unsigned int t_type; 473 474 int (*laddr_check)(struct net *net, __be32 addr); 475 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 476 void (*conn_free)(void *data); 477 int (*conn_path_connect)(struct rds_conn_path *cp); 478 void (*conn_path_shutdown)(struct rds_conn_path *conn); 479 void (*xmit_path_prepare)(struct rds_conn_path *cp); 480 void (*xmit_path_complete)(struct rds_conn_path *cp); 481 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 482 unsigned int hdr_off, unsigned int sg, unsigned int off); 483 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 484 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 485 int (*recv_path)(struct rds_conn_path *cp); 486 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 487 void (*inc_free)(struct rds_incoming *inc); 488 489 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 490 struct rdma_cm_event *event); 491 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 492 void (*cm_connect_complete)(struct rds_connection *conn, 493 struct rdma_cm_event *event); 494 495 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 496 unsigned int avail); 497 void (*exit)(void); 498 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 499 struct rds_sock *rs, u32 *key_ret); 500 void (*sync_mr)(void *trans_private, int direction); 501 void (*free_mr)(void *trans_private, int invalidate); 502 void (*flush_mrs)(void); 503 }; 504 505 struct rds_sock { 506 struct sock rs_sk; 507 508 u64 rs_user_addr; 509 u64 rs_user_bytes; 510 511 /* 512 * bound_addr used for both incoming and outgoing, no INADDR_ANY 513 * support. 514 */ 515 struct rhash_head rs_bound_node; 516 u64 rs_bound_key; 517 __be32 rs_bound_addr; 518 __be32 rs_conn_addr; 519 __be16 rs_bound_port; 520 __be16 rs_conn_port; 521 struct rds_transport *rs_transport; 522 523 /* 524 * rds_sendmsg caches the conn it used the last time around. 525 * This helps avoid costly lookups. 526 */ 527 struct rds_connection *rs_conn; 528 529 /* flag indicating we were congested or not */ 530 int rs_congested; 531 /* seen congestion (ENOBUFS) when sending? */ 532 int rs_seen_congestion; 533 534 /* rs_lock protects all these adjacent members before the newline */ 535 spinlock_t rs_lock; 536 struct list_head rs_send_queue; 537 u32 rs_snd_bytes; 538 int rs_rcv_bytes; 539 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 540 541 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 542 * to decide whether the application should be woken up. 543 * If not set, we use rs_cong_track to find out whether a cong map 544 * update arrived. 545 */ 546 uint64_t rs_cong_mask; 547 uint64_t rs_cong_notify; 548 struct list_head rs_cong_list; 549 unsigned long rs_cong_track; 550 551 /* 552 * rs_recv_lock protects the receive queue, and is 553 * used to serialize with rds_release. 554 */ 555 rwlock_t rs_recv_lock; 556 struct list_head rs_recv_queue; 557 558 /* just for stats reporting */ 559 struct list_head rs_item; 560 561 /* these have their own lock */ 562 spinlock_t rs_rdma_lock; 563 struct rb_root rs_rdma_keys; 564 565 /* Socket options - in case there will be more */ 566 unsigned char rs_recverr, 567 rs_cong_monitor; 568 u32 rs_hash_initval; 569 }; 570 571 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 572 { 573 return container_of(sk, struct rds_sock, rs_sk); 574 } 575 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 576 { 577 return &rs->rs_sk; 578 } 579 580 /* 581 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 582 * to account for overhead. We don't account for overhead, we just apply 583 * the number of payload bytes to the specified value. 584 */ 585 static inline int rds_sk_sndbuf(struct rds_sock *rs) 586 { 587 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 588 } 589 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 590 { 591 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 592 } 593 594 struct rds_statistics { 595 uint64_t s_conn_reset; 596 uint64_t s_recv_drop_bad_checksum; 597 uint64_t s_recv_drop_old_seq; 598 uint64_t s_recv_drop_no_sock; 599 uint64_t s_recv_drop_dead_sock; 600 uint64_t s_recv_deliver_raced; 601 uint64_t s_recv_delivered; 602 uint64_t s_recv_queued; 603 uint64_t s_recv_immediate_retry; 604 uint64_t s_recv_delayed_retry; 605 uint64_t s_recv_ack_required; 606 uint64_t s_recv_rdma_bytes; 607 uint64_t s_recv_ping; 608 uint64_t s_send_queue_empty; 609 uint64_t s_send_queue_full; 610 uint64_t s_send_lock_contention; 611 uint64_t s_send_lock_queue_raced; 612 uint64_t s_send_immediate_retry; 613 uint64_t s_send_delayed_retry; 614 uint64_t s_send_drop_acked; 615 uint64_t s_send_ack_required; 616 uint64_t s_send_queued; 617 uint64_t s_send_rdma; 618 uint64_t s_send_rdma_bytes; 619 uint64_t s_send_pong; 620 uint64_t s_page_remainder_hit; 621 uint64_t s_page_remainder_miss; 622 uint64_t s_copy_to_user; 623 uint64_t s_copy_from_user; 624 uint64_t s_cong_update_queued; 625 uint64_t s_cong_update_received; 626 uint64_t s_cong_send_error; 627 uint64_t s_cong_send_blocked; 628 }; 629 630 /* af_rds.c */ 631 void rds_sock_addref(struct rds_sock *rs); 632 void rds_sock_put(struct rds_sock *rs); 633 void rds_wake_sk_sleep(struct rds_sock *rs); 634 static inline void __rds_wake_sk_sleep(struct sock *sk) 635 { 636 wait_queue_head_t *waitq = sk_sleep(sk); 637 638 if (!sock_flag(sk, SOCK_DEAD) && waitq) 639 wake_up(waitq); 640 } 641 extern wait_queue_head_t rds_poll_waitq; 642 643 644 /* bind.c */ 645 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 646 void rds_remove_bound(struct rds_sock *rs); 647 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 648 int rds_bind_lock_init(void); 649 void rds_bind_lock_destroy(void); 650 651 /* cong.c */ 652 int rds_cong_get_maps(struct rds_connection *conn); 653 void rds_cong_add_conn(struct rds_connection *conn); 654 void rds_cong_remove_conn(struct rds_connection *conn); 655 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 656 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 657 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 658 void rds_cong_queue_updates(struct rds_cong_map *map); 659 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 660 int rds_cong_updated_since(unsigned long *recent); 661 void rds_cong_add_socket(struct rds_sock *); 662 void rds_cong_remove_socket(struct rds_sock *); 663 void rds_cong_exit(void); 664 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 665 666 /* conn.c */ 667 int rds_conn_init(void); 668 void rds_conn_exit(void); 669 struct rds_connection *rds_conn_create(struct net *net, 670 __be32 laddr, __be32 faddr, 671 struct rds_transport *trans, gfp_t gfp); 672 struct rds_connection *rds_conn_create_outgoing(struct net *net, 673 __be32 laddr, __be32 faddr, 674 struct rds_transport *trans, gfp_t gfp); 675 void rds_conn_shutdown(struct rds_conn_path *cpath); 676 void rds_conn_destroy(struct rds_connection *conn); 677 void rds_conn_drop(struct rds_connection *conn); 678 void rds_conn_path_drop(struct rds_conn_path *cpath); 679 void rds_conn_connect_if_down(struct rds_connection *conn); 680 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 681 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 682 struct rds_info_iterator *iter, 683 struct rds_info_lengths *lens, 684 int (*visitor)(struct rds_connection *, void *), 685 size_t item_len); 686 __printf(2, 3) 687 void __rds_conn_error(struct rds_connection *conn, const char *, ...); 688 #define rds_conn_error(conn, fmt...) \ 689 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) 690 691 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 692 #define rds_conn_path_error(cp, fmt...) \ 693 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 694 695 static inline int 696 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 697 { 698 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 699 } 700 701 static inline int 702 rds_conn_transition(struct rds_connection *conn, int old, int new) 703 { 704 WARN_ON(conn->c_trans->t_mp_capable); 705 return rds_conn_path_transition(&conn->c_path[0], old, new); 706 } 707 708 static inline int 709 rds_conn_path_state(struct rds_conn_path *cp) 710 { 711 return atomic_read(&cp->cp_state); 712 } 713 714 static inline int 715 rds_conn_state(struct rds_connection *conn) 716 { 717 WARN_ON(conn->c_trans->t_mp_capable); 718 return rds_conn_path_state(&conn->c_path[0]); 719 } 720 721 static inline int 722 rds_conn_path_up(struct rds_conn_path *cp) 723 { 724 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 725 } 726 727 static inline int 728 rds_conn_up(struct rds_connection *conn) 729 { 730 WARN_ON(conn->c_trans->t_mp_capable); 731 return rds_conn_path_up(&conn->c_path[0]); 732 } 733 734 static inline int 735 rds_conn_path_connecting(struct rds_conn_path *cp) 736 { 737 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 738 } 739 740 static inline int 741 rds_conn_connecting(struct rds_connection *conn) 742 { 743 WARN_ON(conn->c_trans->t_mp_capable); 744 return rds_conn_path_connecting(&conn->c_path[0]); 745 } 746 747 /* message.c */ 748 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 749 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 750 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 751 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 752 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 753 __be16 dport, u64 seq); 754 int rds_message_add_extension(struct rds_header *hdr, 755 unsigned int type, const void *data, unsigned int len); 756 int rds_message_next_extension(struct rds_header *hdr, 757 unsigned int *pos, void *buf, unsigned int *buflen); 758 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 759 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 760 void rds_message_inc_free(struct rds_incoming *inc); 761 void rds_message_addref(struct rds_message *rm); 762 void rds_message_put(struct rds_message *rm); 763 void rds_message_wait(struct rds_message *rm); 764 void rds_message_unmapped(struct rds_message *rm); 765 766 static inline void rds_message_make_checksum(struct rds_header *hdr) 767 { 768 hdr->h_csum = 0; 769 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 770 } 771 772 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 773 { 774 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 775 } 776 777 778 /* page.c */ 779 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 780 gfp_t gfp); 781 int rds_page_copy_user(struct page *page, unsigned long offset, 782 void __user *ptr, unsigned long bytes, 783 int to_user); 784 #define rds_page_copy_to_user(page, offset, ptr, bytes) \ 785 rds_page_copy_user(page, offset, ptr, bytes, 1) 786 #define rds_page_copy_from_user(page, offset, ptr, bytes) \ 787 rds_page_copy_user(page, offset, ptr, bytes, 0) 788 void rds_page_exit(void); 789 790 /* recv.c */ 791 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 792 __be32 saddr); 793 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 794 __be32 saddr); 795 void rds_inc_put(struct rds_incoming *inc); 796 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 797 struct rds_incoming *inc, gfp_t gfp); 798 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 799 int msg_flags); 800 void rds_clear_recv_queue(struct rds_sock *rs); 801 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 802 void rds_inc_info_copy(struct rds_incoming *inc, 803 struct rds_info_iterator *iter, 804 __be32 saddr, __be32 daddr, int flip); 805 806 /* send.c */ 807 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 808 void rds_send_path_reset(struct rds_conn_path *conn); 809 int rds_send_xmit(struct rds_conn_path *cp); 810 struct sockaddr_in; 811 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 812 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 813 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 814 is_acked_func is_acked); 815 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 816 is_acked_func is_acked); 817 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 818 819 /* rdma.c */ 820 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 821 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 822 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 823 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 824 void rds_rdma_drop_keys(struct rds_sock *rs); 825 int rds_rdma_extra_size(struct rds_rdma_args *args); 826 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 827 struct cmsghdr *cmsg); 828 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 829 struct cmsghdr *cmsg); 830 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 831 struct cmsghdr *cmsg); 832 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 833 struct cmsghdr *cmsg); 834 void rds_rdma_free_op(struct rm_rdma_op *ro); 835 void rds_atomic_free_op(struct rm_atomic_op *ao); 836 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 837 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 838 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 839 struct cmsghdr *cmsg); 840 841 void __rds_put_mr_final(struct rds_mr *mr); 842 static inline void rds_mr_put(struct rds_mr *mr) 843 { 844 if (atomic_dec_and_test(&mr->r_refcount)) 845 __rds_put_mr_final(mr); 846 } 847 848 /* stats.c */ 849 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 850 #define rds_stats_inc_which(which, member) do { \ 851 per_cpu(which, get_cpu()).member++; \ 852 put_cpu(); \ 853 } while (0) 854 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 855 #define rds_stats_add_which(which, member, count) do { \ 856 per_cpu(which, get_cpu()).member += count; \ 857 put_cpu(); \ 858 } while (0) 859 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 860 int rds_stats_init(void); 861 void rds_stats_exit(void); 862 void rds_stats_info_copy(struct rds_info_iterator *iter, 863 uint64_t *values, const char *const *names, 864 size_t nr); 865 866 /* sysctl.c */ 867 int rds_sysctl_init(void); 868 void rds_sysctl_exit(void); 869 extern unsigned long rds_sysctl_sndbuf_min; 870 extern unsigned long rds_sysctl_sndbuf_default; 871 extern unsigned long rds_sysctl_sndbuf_max; 872 extern unsigned long rds_sysctl_reconnect_min_jiffies; 873 extern unsigned long rds_sysctl_reconnect_max_jiffies; 874 extern unsigned int rds_sysctl_max_unacked_packets; 875 extern unsigned int rds_sysctl_max_unacked_bytes; 876 extern unsigned int rds_sysctl_ping_enable; 877 extern unsigned long rds_sysctl_trace_flags; 878 extern unsigned int rds_sysctl_trace_level; 879 880 /* threads.c */ 881 int rds_threads_init(void); 882 void rds_threads_exit(void); 883 extern struct workqueue_struct *rds_wq; 884 void rds_queue_reconnect(struct rds_conn_path *cp); 885 void rds_connect_worker(struct work_struct *); 886 void rds_shutdown_worker(struct work_struct *); 887 void rds_send_worker(struct work_struct *); 888 void rds_recv_worker(struct work_struct *); 889 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 890 void rds_connect_complete(struct rds_connection *conn); 891 892 /* transport.c */ 893 int rds_trans_register(struct rds_transport *trans); 894 void rds_trans_unregister(struct rds_transport *trans); 895 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 896 void rds_trans_put(struct rds_transport *trans); 897 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 898 unsigned int avail); 899 struct rds_transport *rds_trans_get(int t_type); 900 int rds_trans_init(void); 901 void rds_trans_exit(void); 902 903 #endif 904