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 /* Per mpath connection state */ 96 struct rds_conn_path { 97 struct rds_connection *cp_conn; 98 struct rds_message *cp_xmit_rm; 99 unsigned long cp_xmit_sg; 100 unsigned int cp_xmit_hdr_off; 101 unsigned int cp_xmit_data_off; 102 unsigned int cp_xmit_atomic_sent; 103 unsigned int cp_xmit_rdma_sent; 104 unsigned int cp_xmit_data_sent; 105 106 spinlock_t cp_lock; /* protect msg queues */ 107 u64 cp_next_tx_seq; 108 struct list_head cp_send_queue; 109 struct list_head cp_retrans; 110 111 u64 cp_next_rx_seq; 112 113 void *cp_transport_data; 114 115 atomic_t cp_state; 116 unsigned long cp_send_gen; 117 unsigned long cp_flags; 118 unsigned long cp_reconnect_jiffies; 119 struct delayed_work cp_send_w; 120 struct delayed_work cp_recv_w; 121 struct delayed_work cp_conn_w; 122 struct work_struct cp_down_w; 123 struct mutex cp_cm_lock; /* protect cp_state & cm */ 124 wait_queue_head_t cp_waitq; 125 126 unsigned int cp_unacked_packets; 127 unsigned int cp_unacked_bytes; 128 unsigned int cp_outgoing:1, 129 cp_pad_to_32:31; 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_pad_to_32:30; 141 int c_npaths; 142 struct rds_connection *c_passive; 143 struct rds_transport *c_trans; 144 145 struct rds_cong_map *c_lcong; 146 struct rds_cong_map *c_fcong; 147 148 /* Protocol version */ 149 unsigned int c_version; 150 struct net *c_net; 151 152 struct list_head c_map_item; 153 unsigned long c_map_queued; 154 155 struct rds_conn_path c_path[RDS_MPATH_WORKERS]; 156 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 157 158 u32 c_my_gen_num; 159 u32 c_peer_gen_num; 160 }; 161 162 static inline 163 struct net *rds_conn_net(struct rds_connection *conn) 164 { 165 return conn->c_net; 166 } 167 168 static inline 169 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 170 { 171 conn->c_net = get_net(net); 172 } 173 174 #define RDS_FLAG_CONG_BITMAP 0x01 175 #define RDS_FLAG_ACK_REQUIRED 0x02 176 #define RDS_FLAG_RETRANSMITTED 0x04 177 #define RDS_MAX_ADV_CREDIT 255 178 179 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 180 * probe to exchange control information before establishing a connection. 181 * Currently the control information that is exchanged is the number of 182 * supported paths. If the peer is a legacy (older kernel revision) peer, 183 * it would return a pong message without additional control information 184 * that would then alert the sender that the peer was an older rev. 185 */ 186 #define RDS_FLAG_PROBE_PORT 1 187 #define RDS_HS_PROBE(sport, dport) \ 188 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 189 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 190 /* 191 * Maximum space available for extension headers. 192 */ 193 #define RDS_HEADER_EXT_SPACE 16 194 195 struct rds_header { 196 __be64 h_sequence; 197 __be64 h_ack; 198 __be32 h_len; 199 __be16 h_sport; 200 __be16 h_dport; 201 u8 h_flags; 202 u8 h_credit; 203 u8 h_padding[4]; 204 __sum16 h_csum; 205 206 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 207 }; 208 209 /* 210 * Reserved - indicates end of extensions 211 */ 212 #define RDS_EXTHDR_NONE 0 213 214 /* 215 * This extension header is included in the very 216 * first message that is sent on a new connection, 217 * and identifies the protocol level. This will help 218 * rolling updates if a future change requires breaking 219 * the protocol. 220 * NB: This is no longer true for IB, where we do a version 221 * negotiation during the connection setup phase (protocol 222 * version information is included in the RDMA CM private data). 223 */ 224 #define RDS_EXTHDR_VERSION 1 225 struct rds_ext_header_version { 226 __be32 h_version; 227 }; 228 229 /* 230 * This extension header is included in the RDS message 231 * chasing an RDMA operation. 232 */ 233 #define RDS_EXTHDR_RDMA 2 234 struct rds_ext_header_rdma { 235 __be32 h_rdma_rkey; 236 }; 237 238 /* 239 * This extension header tells the peer about the 240 * destination <R_Key,offset> of the requested RDMA 241 * operation. 242 */ 243 #define RDS_EXTHDR_RDMA_DEST 3 244 struct rds_ext_header_rdma_dest { 245 __be32 h_rdma_rkey; 246 __be32 h_rdma_offset; 247 }; 248 249 /* Extension header announcing number of paths. 250 * Implicit length = 2 bytes. 251 */ 252 #define RDS_EXTHDR_NPATHS 5 253 #define RDS_EXTHDR_GEN_NUM 6 254 255 #define __RDS_EXTHDR_MAX 16 /* for now */ 256 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) 257 #define RDS_MSG_RX_HDR 0 258 #define RDS_MSG_RX_START 1 259 #define RDS_MSG_RX_END 2 260 #define RDS_MSG_RX_CMSG 3 261 262 struct rds_incoming { 263 atomic_t i_refcount; 264 struct list_head i_item; 265 struct rds_connection *i_conn; 266 struct rds_conn_path *i_conn_path; 267 struct rds_header i_hdr; 268 unsigned long i_rx_jiffies; 269 __be32 i_saddr; 270 271 rds_rdma_cookie_t i_rdma_cookie; 272 struct timeval i_rx_tstamp; 273 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 274 }; 275 276 struct rds_mr { 277 struct rb_node r_rb_node; 278 atomic_t r_refcount; 279 u32 r_key; 280 281 /* A copy of the creation flags */ 282 unsigned int r_use_once:1; 283 unsigned int r_invalidate:1; 284 unsigned int r_write:1; 285 286 /* This is for RDS_MR_DEAD. 287 * It would be nice & consistent to make this part of the above 288 * bit field here, but we need to use test_and_set_bit. 289 */ 290 unsigned long r_state; 291 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 292 struct rds_transport *r_trans; 293 void *r_trans_private; 294 }; 295 296 /* Flags for mr->r_state */ 297 #define RDS_MR_DEAD 0 298 299 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 300 { 301 return r_key | (((u64) offset) << 32); 302 } 303 304 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 305 { 306 return cookie; 307 } 308 309 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 310 { 311 return cookie >> 32; 312 } 313 314 /* atomic operation types */ 315 #define RDS_ATOMIC_TYPE_CSWP 0 316 #define RDS_ATOMIC_TYPE_FADD 1 317 318 /* 319 * m_sock_item and m_conn_item are on lists that are serialized under 320 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 321 * the message will not be put back on the retransmit list after being sent. 322 * messages that are canceled while being sent rely on this. 323 * 324 * m_inc is used by loopback so that it can pass an incoming message straight 325 * back up into the rx path. It embeds a wire header which is also used by 326 * the send path, which is kind of awkward. 327 * 328 * m_sock_item indicates the message's presence on a socket's send or receive 329 * queue. m_rs will point to that socket. 330 * 331 * m_daddr is used by cancellation to prune messages to a given destination. 332 * 333 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 334 * nesting. As paths iterate over messages on a sock, or conn, they must 335 * also lock the conn, or sock, to remove the message from those lists too. 336 * Testing the flag to determine if the message is still on the lists lets 337 * us avoid testing the list_head directly. That means each path can use 338 * the message's list_head to keep it on a local list while juggling locks 339 * without confusing the other path. 340 * 341 * m_ack_seq is an optional field set by transports who need a different 342 * sequence number range to invalidate. They can use this in a callback 343 * that they pass to rds_send_drop_acked() to see if each message has been 344 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 345 * had ack_seq set yet. 346 */ 347 #define RDS_MSG_ON_SOCK 1 348 #define RDS_MSG_ON_CONN 2 349 #define RDS_MSG_HAS_ACK_SEQ 3 350 #define RDS_MSG_ACK_REQUIRED 4 351 #define RDS_MSG_RETRANSMITTED 5 352 #define RDS_MSG_MAPPED 6 353 #define RDS_MSG_PAGEVEC 7 354 #define RDS_MSG_FLUSH 8 355 356 struct rds_message { 357 atomic_t m_refcount; 358 struct list_head m_sock_item; 359 struct list_head m_conn_item; 360 struct rds_incoming m_inc; 361 u64 m_ack_seq; 362 __be32 m_daddr; 363 unsigned long m_flags; 364 365 /* Never access m_rs without holding m_rs_lock. 366 * Lock nesting is 367 * rm->m_rs_lock 368 * -> rs->rs_lock 369 */ 370 spinlock_t m_rs_lock; 371 wait_queue_head_t m_flush_wait; 372 373 struct rds_sock *m_rs; 374 375 /* cookie to send to remote, in rds header */ 376 rds_rdma_cookie_t m_rdma_cookie; 377 378 unsigned int m_used_sgs; 379 unsigned int m_total_sgs; 380 381 void *m_final_op; 382 383 struct { 384 struct rm_atomic_op { 385 int op_type; 386 union { 387 struct { 388 uint64_t compare; 389 uint64_t swap; 390 uint64_t compare_mask; 391 uint64_t swap_mask; 392 } op_m_cswp; 393 struct { 394 uint64_t add; 395 uint64_t nocarry_mask; 396 } op_m_fadd; 397 }; 398 399 u32 op_rkey; 400 u64 op_remote_addr; 401 unsigned int op_notify:1; 402 unsigned int op_recverr:1; 403 unsigned int op_mapped:1; 404 unsigned int op_silent:1; 405 unsigned int op_active:1; 406 struct scatterlist *op_sg; 407 struct rds_notifier *op_notifier; 408 409 struct rds_mr *op_rdma_mr; 410 } atomic; 411 struct rm_rdma_op { 412 u32 op_rkey; 413 u64 op_remote_addr; 414 unsigned int op_write:1; 415 unsigned int op_fence:1; 416 unsigned int op_notify:1; 417 unsigned int op_recverr:1; 418 unsigned int op_mapped:1; 419 unsigned int op_silent:1; 420 unsigned int op_active:1; 421 unsigned int op_bytes; 422 unsigned int op_nents; 423 unsigned int op_count; 424 struct scatterlist *op_sg; 425 struct rds_notifier *op_notifier; 426 427 struct rds_mr *op_rdma_mr; 428 } rdma; 429 struct rm_data_op { 430 unsigned int op_active:1; 431 unsigned int op_notify:1; 432 unsigned int op_nents; 433 unsigned int op_count; 434 unsigned int op_dmasg; 435 unsigned int op_dmaoff; 436 struct scatterlist *op_sg; 437 } data; 438 }; 439 }; 440 441 /* 442 * The RDS notifier is used (optionally) to tell the application about 443 * completed RDMA operations. Rather than keeping the whole rds message 444 * around on the queue, we allocate a small notifier that is put on the 445 * socket's notifier_list. Notifications are delivered to the application 446 * through control messages. 447 */ 448 struct rds_notifier { 449 struct list_head n_list; 450 uint64_t n_user_token; 451 int n_status; 452 }; 453 454 /** 455 * struct rds_transport - transport specific behavioural hooks 456 * 457 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 458 * part of a message. The caller serializes on the send_sem so this 459 * doesn't need to be reentrant for a given conn. The header must be 460 * sent before the data payload. .xmit must be prepared to send a 461 * message with no data payload. .xmit should return the number of 462 * bytes that were sent down the connection, including header bytes. 463 * Returning 0 tells the caller that it doesn't need to perform any 464 * additional work now. This is usually the case when the transport has 465 * filled the sending queue for its connection and will handle 466 * triggering the rds thread to continue the send when space becomes 467 * available. Returning -EAGAIN tells the caller to retry the send 468 * immediately. Returning -ENOMEM tells the caller to retry the send at 469 * some point in the future. 470 * 471 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 472 * it returns the connection can not call rds_recv_incoming(). 473 * This will only be called once after conn_connect returns 474 * non-zero success and will The caller serializes this with 475 * the send and connecting paths (xmit_* and conn_*). The 476 * transport is responsible for other serialization, including 477 * rds_recv_incoming(). This is called in process context but 478 * should try hard not to block. 479 */ 480 481 struct rds_transport { 482 char t_name[TRANSNAMSIZ]; 483 struct list_head t_item; 484 struct module *t_owner; 485 unsigned int t_prefer_loopback:1, 486 t_mp_capable:1; 487 unsigned int t_type; 488 489 int (*laddr_check)(struct net *net, __be32 addr); 490 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 491 void (*conn_free)(void *data); 492 int (*conn_path_connect)(struct rds_conn_path *cp); 493 void (*conn_path_shutdown)(struct rds_conn_path *conn); 494 void (*xmit_path_prepare)(struct rds_conn_path *cp); 495 void (*xmit_path_complete)(struct rds_conn_path *cp); 496 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 497 unsigned int hdr_off, unsigned int sg, unsigned int off); 498 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 499 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 500 int (*recv_path)(struct rds_conn_path *cp); 501 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 502 void (*inc_free)(struct rds_incoming *inc); 503 504 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 505 struct rdma_cm_event *event); 506 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 507 void (*cm_connect_complete)(struct rds_connection *conn, 508 struct rdma_cm_event *event); 509 510 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 511 unsigned int avail); 512 void (*exit)(void); 513 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 514 struct rds_sock *rs, u32 *key_ret); 515 void (*sync_mr)(void *trans_private, int direction); 516 void (*free_mr)(void *trans_private, int invalidate); 517 void (*flush_mrs)(void); 518 }; 519 520 struct rds_sock { 521 struct sock rs_sk; 522 523 u64 rs_user_addr; 524 u64 rs_user_bytes; 525 526 /* 527 * bound_addr used for both incoming and outgoing, no INADDR_ANY 528 * support. 529 */ 530 struct rhash_head rs_bound_node; 531 u64 rs_bound_key; 532 __be32 rs_bound_addr; 533 __be32 rs_conn_addr; 534 __be16 rs_bound_port; 535 __be16 rs_conn_port; 536 struct rds_transport *rs_transport; 537 538 /* 539 * rds_sendmsg caches the conn it used the last time around. 540 * This helps avoid costly lookups. 541 */ 542 struct rds_connection *rs_conn; 543 544 /* flag indicating we were congested or not */ 545 int rs_congested; 546 /* seen congestion (ENOBUFS) when sending? */ 547 int rs_seen_congestion; 548 549 /* rs_lock protects all these adjacent members before the newline */ 550 spinlock_t rs_lock; 551 struct list_head rs_send_queue; 552 u32 rs_snd_bytes; 553 int rs_rcv_bytes; 554 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 555 556 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 557 * to decide whether the application should be woken up. 558 * If not set, we use rs_cong_track to find out whether a cong map 559 * update arrived. 560 */ 561 uint64_t rs_cong_mask; 562 uint64_t rs_cong_notify; 563 struct list_head rs_cong_list; 564 unsigned long rs_cong_track; 565 566 /* 567 * rs_recv_lock protects the receive queue, and is 568 * used to serialize with rds_release. 569 */ 570 rwlock_t rs_recv_lock; 571 struct list_head rs_recv_queue; 572 573 /* just for stats reporting */ 574 struct list_head rs_item; 575 576 /* these have their own lock */ 577 spinlock_t rs_rdma_lock; 578 struct rb_root rs_rdma_keys; 579 580 /* Socket options - in case there will be more */ 581 unsigned char rs_recverr, 582 rs_cong_monitor; 583 u32 rs_hash_initval; 584 585 /* Socket receive path trace points*/ 586 u8 rs_rx_traces; 587 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 588 }; 589 590 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 591 { 592 return container_of(sk, struct rds_sock, rs_sk); 593 } 594 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 595 { 596 return &rs->rs_sk; 597 } 598 599 /* 600 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 601 * to account for overhead. We don't account for overhead, we just apply 602 * the number of payload bytes to the specified value. 603 */ 604 static inline int rds_sk_sndbuf(struct rds_sock *rs) 605 { 606 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 607 } 608 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 609 { 610 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 611 } 612 613 struct rds_statistics { 614 uint64_t s_conn_reset; 615 uint64_t s_recv_drop_bad_checksum; 616 uint64_t s_recv_drop_old_seq; 617 uint64_t s_recv_drop_no_sock; 618 uint64_t s_recv_drop_dead_sock; 619 uint64_t s_recv_deliver_raced; 620 uint64_t s_recv_delivered; 621 uint64_t s_recv_queued; 622 uint64_t s_recv_immediate_retry; 623 uint64_t s_recv_delayed_retry; 624 uint64_t s_recv_ack_required; 625 uint64_t s_recv_rdma_bytes; 626 uint64_t s_recv_ping; 627 uint64_t s_send_queue_empty; 628 uint64_t s_send_queue_full; 629 uint64_t s_send_lock_contention; 630 uint64_t s_send_lock_queue_raced; 631 uint64_t s_send_immediate_retry; 632 uint64_t s_send_delayed_retry; 633 uint64_t s_send_drop_acked; 634 uint64_t s_send_ack_required; 635 uint64_t s_send_queued; 636 uint64_t s_send_rdma; 637 uint64_t s_send_rdma_bytes; 638 uint64_t s_send_pong; 639 uint64_t s_page_remainder_hit; 640 uint64_t s_page_remainder_miss; 641 uint64_t s_copy_to_user; 642 uint64_t s_copy_from_user; 643 uint64_t s_cong_update_queued; 644 uint64_t s_cong_update_received; 645 uint64_t s_cong_send_error; 646 uint64_t s_cong_send_blocked; 647 uint64_t s_recv_bytes_added_to_socket; 648 uint64_t s_recv_bytes_removed_from_socket; 649 650 }; 651 652 /* af_rds.c */ 653 void rds_sock_addref(struct rds_sock *rs); 654 void rds_sock_put(struct rds_sock *rs); 655 void rds_wake_sk_sleep(struct rds_sock *rs); 656 static inline void __rds_wake_sk_sleep(struct sock *sk) 657 { 658 wait_queue_head_t *waitq = sk_sleep(sk); 659 660 if (!sock_flag(sk, SOCK_DEAD) && waitq) 661 wake_up(waitq); 662 } 663 extern wait_queue_head_t rds_poll_waitq; 664 665 666 /* bind.c */ 667 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 668 void rds_remove_bound(struct rds_sock *rs); 669 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 670 int rds_bind_lock_init(void); 671 void rds_bind_lock_destroy(void); 672 673 /* cong.c */ 674 int rds_cong_get_maps(struct rds_connection *conn); 675 void rds_cong_add_conn(struct rds_connection *conn); 676 void rds_cong_remove_conn(struct rds_connection *conn); 677 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 678 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 679 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 680 void rds_cong_queue_updates(struct rds_cong_map *map); 681 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 682 int rds_cong_updated_since(unsigned long *recent); 683 void rds_cong_add_socket(struct rds_sock *); 684 void rds_cong_remove_socket(struct rds_sock *); 685 void rds_cong_exit(void); 686 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 687 688 /* conn.c */ 689 extern u32 rds_gen_num; 690 int rds_conn_init(void); 691 void rds_conn_exit(void); 692 struct rds_connection *rds_conn_create(struct net *net, 693 __be32 laddr, __be32 faddr, 694 struct rds_transport *trans, gfp_t gfp); 695 struct rds_connection *rds_conn_create_outgoing(struct net *net, 696 __be32 laddr, __be32 faddr, 697 struct rds_transport *trans, gfp_t gfp); 698 void rds_conn_shutdown(struct rds_conn_path *cpath); 699 void rds_conn_destroy(struct rds_connection *conn); 700 void rds_conn_drop(struct rds_connection *conn); 701 void rds_conn_path_drop(struct rds_conn_path *cpath); 702 void rds_conn_connect_if_down(struct rds_connection *conn); 703 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 704 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 705 struct rds_info_iterator *iter, 706 struct rds_info_lengths *lens, 707 int (*visitor)(struct rds_connection *, void *), 708 size_t item_len); 709 710 __printf(2, 3) 711 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 712 #define rds_conn_path_error(cp, fmt...) \ 713 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 714 715 static inline int 716 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 717 { 718 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 719 } 720 721 static inline int 722 rds_conn_transition(struct rds_connection *conn, int old, int new) 723 { 724 WARN_ON(conn->c_trans->t_mp_capable); 725 return rds_conn_path_transition(&conn->c_path[0], old, new); 726 } 727 728 static inline int 729 rds_conn_path_state(struct rds_conn_path *cp) 730 { 731 return atomic_read(&cp->cp_state); 732 } 733 734 static inline int 735 rds_conn_state(struct rds_connection *conn) 736 { 737 WARN_ON(conn->c_trans->t_mp_capable); 738 return rds_conn_path_state(&conn->c_path[0]); 739 } 740 741 static inline int 742 rds_conn_path_up(struct rds_conn_path *cp) 743 { 744 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 745 } 746 747 static inline int 748 rds_conn_up(struct rds_connection *conn) 749 { 750 WARN_ON(conn->c_trans->t_mp_capable); 751 return rds_conn_path_up(&conn->c_path[0]); 752 } 753 754 static inline int 755 rds_conn_path_connecting(struct rds_conn_path *cp) 756 { 757 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 758 } 759 760 static inline int 761 rds_conn_connecting(struct rds_connection *conn) 762 { 763 WARN_ON(conn->c_trans->t_mp_capable); 764 return rds_conn_path_connecting(&conn->c_path[0]); 765 } 766 767 /* message.c */ 768 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 769 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 770 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 771 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 772 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 773 __be16 dport, u64 seq); 774 int rds_message_add_extension(struct rds_header *hdr, 775 unsigned int type, const void *data, unsigned int len); 776 int rds_message_next_extension(struct rds_header *hdr, 777 unsigned int *pos, void *buf, unsigned int *buflen); 778 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 779 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 780 void rds_message_inc_free(struct rds_incoming *inc); 781 void rds_message_addref(struct rds_message *rm); 782 void rds_message_put(struct rds_message *rm); 783 void rds_message_wait(struct rds_message *rm); 784 void rds_message_unmapped(struct rds_message *rm); 785 786 static inline void rds_message_make_checksum(struct rds_header *hdr) 787 { 788 hdr->h_csum = 0; 789 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 790 } 791 792 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 793 { 794 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 795 } 796 797 798 /* page.c */ 799 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 800 gfp_t gfp); 801 void rds_page_exit(void); 802 803 /* recv.c */ 804 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 805 __be32 saddr); 806 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 807 __be32 saddr); 808 void rds_inc_put(struct rds_incoming *inc); 809 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 810 struct rds_incoming *inc, gfp_t gfp); 811 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 812 int msg_flags); 813 void rds_clear_recv_queue(struct rds_sock *rs); 814 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 815 void rds_inc_info_copy(struct rds_incoming *inc, 816 struct rds_info_iterator *iter, 817 __be32 saddr, __be32 daddr, int flip); 818 819 /* send.c */ 820 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 821 void rds_send_path_reset(struct rds_conn_path *conn); 822 int rds_send_xmit(struct rds_conn_path *cp); 823 struct sockaddr_in; 824 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 825 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 826 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 827 is_acked_func is_acked); 828 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 829 is_acked_func is_acked); 830 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 831 832 /* rdma.c */ 833 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 834 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 835 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 836 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 837 void rds_rdma_drop_keys(struct rds_sock *rs); 838 int rds_rdma_extra_size(struct rds_rdma_args *args); 839 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 840 struct cmsghdr *cmsg); 841 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 842 struct cmsghdr *cmsg); 843 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 844 struct cmsghdr *cmsg); 845 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 846 struct cmsghdr *cmsg); 847 void rds_rdma_free_op(struct rm_rdma_op *ro); 848 void rds_atomic_free_op(struct rm_atomic_op *ao); 849 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 850 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 851 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 852 struct cmsghdr *cmsg); 853 854 void __rds_put_mr_final(struct rds_mr *mr); 855 static inline void rds_mr_put(struct rds_mr *mr) 856 { 857 if (atomic_dec_and_test(&mr->r_refcount)) 858 __rds_put_mr_final(mr); 859 } 860 861 /* stats.c */ 862 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 863 #define rds_stats_inc_which(which, member) do { \ 864 per_cpu(which, get_cpu()).member++; \ 865 put_cpu(); \ 866 } while (0) 867 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 868 #define rds_stats_add_which(which, member, count) do { \ 869 per_cpu(which, get_cpu()).member += count; \ 870 put_cpu(); \ 871 } while (0) 872 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 873 int rds_stats_init(void); 874 void rds_stats_exit(void); 875 void rds_stats_info_copy(struct rds_info_iterator *iter, 876 uint64_t *values, const char *const *names, 877 size_t nr); 878 879 /* sysctl.c */ 880 int rds_sysctl_init(void); 881 void rds_sysctl_exit(void); 882 extern unsigned long rds_sysctl_sndbuf_min; 883 extern unsigned long rds_sysctl_sndbuf_default; 884 extern unsigned long rds_sysctl_sndbuf_max; 885 extern unsigned long rds_sysctl_reconnect_min_jiffies; 886 extern unsigned long rds_sysctl_reconnect_max_jiffies; 887 extern unsigned int rds_sysctl_max_unacked_packets; 888 extern unsigned int rds_sysctl_max_unacked_bytes; 889 extern unsigned int rds_sysctl_ping_enable; 890 extern unsigned long rds_sysctl_trace_flags; 891 extern unsigned int rds_sysctl_trace_level; 892 893 /* threads.c */ 894 int rds_threads_init(void); 895 void rds_threads_exit(void); 896 extern struct workqueue_struct *rds_wq; 897 void rds_queue_reconnect(struct rds_conn_path *cp); 898 void rds_connect_worker(struct work_struct *); 899 void rds_shutdown_worker(struct work_struct *); 900 void rds_send_worker(struct work_struct *); 901 void rds_recv_worker(struct work_struct *); 902 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 903 void rds_connect_complete(struct rds_connection *conn); 904 905 /* transport.c */ 906 void rds_trans_register(struct rds_transport *trans); 907 void rds_trans_unregister(struct rds_transport *trans); 908 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 909 void rds_trans_put(struct rds_transport *trans); 910 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 911 unsigned int avail); 912 struct rds_transport *rds_trans_get(int t_type); 913 int rds_trans_init(void); 914 void rds_trans_exit(void); 915 916 #endif 917