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 #include <linux/refcount.h> 12 13 #include "info.h" 14 15 /* 16 * RDS Network protocol version 17 */ 18 #define RDS_PROTOCOL_3_0 0x0300 19 #define RDS_PROTOCOL_3_1 0x0301 20 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 21 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) 22 #define RDS_PROTOCOL_MINOR(v) ((v) & 255) 23 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) 24 25 /* 26 * XXX randomly chosen, but at least seems to be unused: 27 * # 18464-18768 Unassigned 28 * We should do better. We want a reserved port to discourage unpriv'ed 29 * userspace from listening. 30 */ 31 #define RDS_PORT 18634 32 33 #ifdef ATOMIC64_INIT 34 #define KERNEL_HAS_ATOMIC64 35 #endif 36 37 #ifdef RDS_DEBUG 38 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 39 #else 40 /* sigh, pr_debug() causes unused variable warnings */ 41 static inline __printf(1, 2) 42 void rdsdebug(char *fmt, ...) 43 { 44 } 45 #endif 46 47 /* XXX is there one of these somewhere? */ 48 #define ceil(x, y) \ 49 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 50 51 #define RDS_FRAG_SHIFT 12 52 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 53 54 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ 55 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) 56 57 #define RDS_CONG_MAP_BYTES (65536 / 8) 58 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 59 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 60 61 struct rds_cong_map { 62 struct rb_node m_rb_node; 63 __be32 m_addr; 64 wait_queue_head_t m_waitq; 65 struct list_head m_conn_list; 66 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 67 }; 68 69 70 /* 71 * This is how we will track the connection state: 72 * A connection is always in one of the following 73 * states. Updates to the state are atomic and imply 74 * a memory barrier. 75 */ 76 enum { 77 RDS_CONN_DOWN = 0, 78 RDS_CONN_CONNECTING, 79 RDS_CONN_DISCONNECTING, 80 RDS_CONN_UP, 81 RDS_CONN_RESETTING, 82 RDS_CONN_ERROR, 83 }; 84 85 /* Bits for c_flags */ 86 #define RDS_LL_SEND_FULL 0 87 #define RDS_RECONNECT_PENDING 1 88 #define RDS_IN_XMIT 2 89 #define RDS_RECV_REFILL 3 90 91 /* Max number of multipaths per RDS connection. Must be a power of 2 */ 92 #define RDS_MPATH_WORKERS 8 93 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ 94 (rs)->rs_hash_initval) & ((n) - 1)) 95 96 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) 97 98 /* Per mpath connection state */ 99 struct rds_conn_path { 100 struct rds_connection *cp_conn; 101 struct rds_message *cp_xmit_rm; 102 unsigned long cp_xmit_sg; 103 unsigned int cp_xmit_hdr_off; 104 unsigned int cp_xmit_data_off; 105 unsigned int cp_xmit_atomic_sent; 106 unsigned int cp_xmit_rdma_sent; 107 unsigned int cp_xmit_data_sent; 108 109 spinlock_t cp_lock; /* protect msg queues */ 110 u64 cp_next_tx_seq; 111 struct list_head cp_send_queue; 112 struct list_head cp_retrans; 113 114 u64 cp_next_rx_seq; 115 116 void *cp_transport_data; 117 118 atomic_t cp_state; 119 unsigned long cp_send_gen; 120 unsigned long cp_flags; 121 unsigned long cp_reconnect_jiffies; 122 struct delayed_work cp_send_w; 123 struct delayed_work cp_recv_w; 124 struct delayed_work cp_conn_w; 125 struct work_struct cp_down_w; 126 struct mutex cp_cm_lock; /* protect cp_state & cm */ 127 wait_queue_head_t cp_waitq; 128 129 unsigned int cp_unacked_packets; 130 unsigned int cp_unacked_bytes; 131 unsigned int cp_index; 132 }; 133 134 /* One rds_connection per RDS address pair */ 135 struct rds_connection { 136 struct hlist_node c_hash_node; 137 __be32 c_laddr; 138 __be32 c_faddr; 139 unsigned int c_loopback:1, 140 c_ping_triggered:1, 141 c_destroy_in_prog:1, 142 c_pad_to_32:29; 143 int c_npaths; 144 struct rds_connection *c_passive; 145 struct rds_transport *c_trans; 146 147 struct rds_cong_map *c_lcong; 148 struct rds_cong_map *c_fcong; 149 150 /* Protocol version */ 151 unsigned int c_version; 152 struct net *c_net; 153 154 struct list_head c_map_item; 155 unsigned long c_map_queued; 156 157 struct rds_conn_path c_path[RDS_MPATH_WORKERS]; 158 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 159 160 u32 c_my_gen_num; 161 u32 c_peer_gen_num; 162 }; 163 164 static inline 165 struct net *rds_conn_net(struct rds_connection *conn) 166 { 167 return conn->c_net; 168 } 169 170 static inline 171 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 172 { 173 conn->c_net = get_net(net); 174 } 175 176 #define RDS_FLAG_CONG_BITMAP 0x01 177 #define RDS_FLAG_ACK_REQUIRED 0x02 178 #define RDS_FLAG_RETRANSMITTED 0x04 179 #define RDS_MAX_ADV_CREDIT 255 180 181 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 182 * probe to exchange control information before establishing a connection. 183 * Currently the control information that is exchanged is the number of 184 * supported paths. If the peer is a legacy (older kernel revision) peer, 185 * it would return a pong message without additional control information 186 * that would then alert the sender that the peer was an older rev. 187 */ 188 #define RDS_FLAG_PROBE_PORT 1 189 #define RDS_HS_PROBE(sport, dport) \ 190 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 191 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 192 /* 193 * Maximum space available for extension headers. 194 */ 195 #define RDS_HEADER_EXT_SPACE 16 196 197 struct rds_header { 198 __be64 h_sequence; 199 __be64 h_ack; 200 __be32 h_len; 201 __be16 h_sport; 202 __be16 h_dport; 203 u8 h_flags; 204 u8 h_credit; 205 u8 h_padding[4]; 206 __sum16 h_csum; 207 208 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 209 }; 210 211 /* 212 * Reserved - indicates end of extensions 213 */ 214 #define RDS_EXTHDR_NONE 0 215 216 /* 217 * This extension header is included in the very 218 * first message that is sent on a new connection, 219 * and identifies the protocol level. This will help 220 * rolling updates if a future change requires breaking 221 * the protocol. 222 * NB: This is no longer true for IB, where we do a version 223 * negotiation during the connection setup phase (protocol 224 * version information is included in the RDMA CM private data). 225 */ 226 #define RDS_EXTHDR_VERSION 1 227 struct rds_ext_header_version { 228 __be32 h_version; 229 }; 230 231 /* 232 * This extension header is included in the RDS message 233 * chasing an RDMA operation. 234 */ 235 #define RDS_EXTHDR_RDMA 2 236 struct rds_ext_header_rdma { 237 __be32 h_rdma_rkey; 238 }; 239 240 /* 241 * This extension header tells the peer about the 242 * destination <R_Key,offset> of the requested RDMA 243 * operation. 244 */ 245 #define RDS_EXTHDR_RDMA_DEST 3 246 struct rds_ext_header_rdma_dest { 247 __be32 h_rdma_rkey; 248 __be32 h_rdma_offset; 249 }; 250 251 /* Extension header announcing number of paths. 252 * Implicit length = 2 bytes. 253 */ 254 #define RDS_EXTHDR_NPATHS 5 255 #define RDS_EXTHDR_GEN_NUM 6 256 257 #define __RDS_EXTHDR_MAX 16 /* for now */ 258 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) 259 #define RDS_MSG_RX_HDR 0 260 #define RDS_MSG_RX_START 1 261 #define RDS_MSG_RX_END 2 262 #define RDS_MSG_RX_CMSG 3 263 264 struct rds_incoming { 265 refcount_t i_refcount; 266 struct list_head i_item; 267 struct rds_connection *i_conn; 268 struct rds_conn_path *i_conn_path; 269 struct rds_header i_hdr; 270 unsigned long i_rx_jiffies; 271 __be32 i_saddr; 272 273 rds_rdma_cookie_t i_rdma_cookie; 274 struct timeval i_rx_tstamp; 275 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 276 }; 277 278 struct rds_mr { 279 struct rb_node r_rb_node; 280 refcount_t r_refcount; 281 u32 r_key; 282 283 /* A copy of the creation flags */ 284 unsigned int r_use_once:1; 285 unsigned int r_invalidate:1; 286 unsigned int r_write:1; 287 288 /* This is for RDS_MR_DEAD. 289 * It would be nice & consistent to make this part of the above 290 * bit field here, but we need to use test_and_set_bit. 291 */ 292 unsigned long r_state; 293 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 294 struct rds_transport *r_trans; 295 void *r_trans_private; 296 }; 297 298 /* Flags for mr->r_state */ 299 #define RDS_MR_DEAD 0 300 301 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 302 { 303 return r_key | (((u64) offset) << 32); 304 } 305 306 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 307 { 308 return cookie; 309 } 310 311 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 312 { 313 return cookie >> 32; 314 } 315 316 /* atomic operation types */ 317 #define RDS_ATOMIC_TYPE_CSWP 0 318 #define RDS_ATOMIC_TYPE_FADD 1 319 320 /* 321 * m_sock_item and m_conn_item are on lists that are serialized under 322 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 323 * the message will not be put back on the retransmit list after being sent. 324 * messages that are canceled while being sent rely on this. 325 * 326 * m_inc is used by loopback so that it can pass an incoming message straight 327 * back up into the rx path. It embeds a wire header which is also used by 328 * the send path, which is kind of awkward. 329 * 330 * m_sock_item indicates the message's presence on a socket's send or receive 331 * queue. m_rs will point to that socket. 332 * 333 * m_daddr is used by cancellation to prune messages to a given destination. 334 * 335 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 336 * nesting. As paths iterate over messages on a sock, or conn, they must 337 * also lock the conn, or sock, to remove the message from those lists too. 338 * Testing the flag to determine if the message is still on the lists lets 339 * us avoid testing the list_head directly. That means each path can use 340 * the message's list_head to keep it on a local list while juggling locks 341 * without confusing the other path. 342 * 343 * m_ack_seq is an optional field set by transports who need a different 344 * sequence number range to invalidate. They can use this in a callback 345 * that they pass to rds_send_drop_acked() to see if each message has been 346 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 347 * had ack_seq set yet. 348 */ 349 #define RDS_MSG_ON_SOCK 1 350 #define RDS_MSG_ON_CONN 2 351 #define RDS_MSG_HAS_ACK_SEQ 3 352 #define RDS_MSG_ACK_REQUIRED 4 353 #define RDS_MSG_RETRANSMITTED 5 354 #define RDS_MSG_MAPPED 6 355 #define RDS_MSG_PAGEVEC 7 356 #define RDS_MSG_FLUSH 8 357 358 struct rds_message { 359 refcount_t m_refcount; 360 struct list_head m_sock_item; 361 struct list_head m_conn_item; 362 struct rds_incoming m_inc; 363 u64 m_ack_seq; 364 __be32 m_daddr; 365 unsigned long m_flags; 366 367 /* Never access m_rs without holding m_rs_lock. 368 * Lock nesting is 369 * rm->m_rs_lock 370 * -> rs->rs_lock 371 */ 372 spinlock_t m_rs_lock; 373 wait_queue_head_t m_flush_wait; 374 375 struct rds_sock *m_rs; 376 377 /* cookie to send to remote, in rds header */ 378 rds_rdma_cookie_t m_rdma_cookie; 379 380 unsigned int m_used_sgs; 381 unsigned int m_total_sgs; 382 383 void *m_final_op; 384 385 struct { 386 struct rm_atomic_op { 387 int op_type; 388 union { 389 struct { 390 uint64_t compare; 391 uint64_t swap; 392 uint64_t compare_mask; 393 uint64_t swap_mask; 394 } op_m_cswp; 395 struct { 396 uint64_t add; 397 uint64_t nocarry_mask; 398 } op_m_fadd; 399 }; 400 401 u32 op_rkey; 402 u64 op_remote_addr; 403 unsigned int op_notify:1; 404 unsigned int op_recverr:1; 405 unsigned int op_mapped:1; 406 unsigned int op_silent:1; 407 unsigned int op_active:1; 408 struct scatterlist *op_sg; 409 struct rds_notifier *op_notifier; 410 411 struct rds_mr *op_rdma_mr; 412 } atomic; 413 struct rm_rdma_op { 414 u32 op_rkey; 415 u64 op_remote_addr; 416 unsigned int op_write:1; 417 unsigned int op_fence:1; 418 unsigned int op_notify:1; 419 unsigned int op_recverr:1; 420 unsigned int op_mapped:1; 421 unsigned int op_silent:1; 422 unsigned int op_active:1; 423 unsigned int op_bytes; 424 unsigned int op_nents; 425 unsigned int op_count; 426 struct scatterlist *op_sg; 427 struct rds_notifier *op_notifier; 428 429 struct rds_mr *op_rdma_mr; 430 } rdma; 431 struct rm_data_op { 432 unsigned int op_active:1; 433 unsigned int op_notify:1; 434 unsigned int op_nents; 435 unsigned int op_count; 436 unsigned int op_dmasg; 437 unsigned int op_dmaoff; 438 struct scatterlist *op_sg; 439 } data; 440 }; 441 }; 442 443 /* 444 * The RDS notifier is used (optionally) to tell the application about 445 * completed RDMA operations. Rather than keeping the whole rds message 446 * around on the queue, we allocate a small notifier that is put on the 447 * socket's notifier_list. Notifications are delivered to the application 448 * through control messages. 449 */ 450 struct rds_notifier { 451 struct list_head n_list; 452 uint64_t n_user_token; 453 int n_status; 454 }; 455 456 /** 457 * struct rds_transport - transport specific behavioural hooks 458 * 459 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 460 * part of a message. The caller serializes on the send_sem so this 461 * doesn't need to be reentrant for a given conn. The header must be 462 * sent before the data payload. .xmit must be prepared to send a 463 * message with no data payload. .xmit should return the number of 464 * bytes that were sent down the connection, including header bytes. 465 * Returning 0 tells the caller that it doesn't need to perform any 466 * additional work now. This is usually the case when the transport has 467 * filled the sending queue for its connection and will handle 468 * triggering the rds thread to continue the send when space becomes 469 * available. Returning -EAGAIN tells the caller to retry the send 470 * immediately. Returning -ENOMEM tells the caller to retry the send at 471 * some point in the future. 472 * 473 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 474 * it returns the connection can not call rds_recv_incoming(). 475 * This will only be called once after conn_connect returns 476 * non-zero success and will The caller serializes this with 477 * the send and connecting paths (xmit_* and conn_*). The 478 * transport is responsible for other serialization, including 479 * rds_recv_incoming(). This is called in process context but 480 * should try hard not to block. 481 */ 482 483 struct rds_transport { 484 char t_name[TRANSNAMSIZ]; 485 struct list_head t_item; 486 struct module *t_owner; 487 unsigned int t_prefer_loopback:1, 488 t_mp_capable:1; 489 unsigned int t_type; 490 491 int (*laddr_check)(struct net *net, __be32 addr); 492 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 493 void (*conn_free)(void *data); 494 int (*conn_path_connect)(struct rds_conn_path *cp); 495 void (*conn_path_shutdown)(struct rds_conn_path *conn); 496 void (*xmit_path_prepare)(struct rds_conn_path *cp); 497 void (*xmit_path_complete)(struct rds_conn_path *cp); 498 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 499 unsigned int hdr_off, unsigned int sg, unsigned int off); 500 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 501 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 502 int (*recv_path)(struct rds_conn_path *cp); 503 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 504 void (*inc_free)(struct rds_incoming *inc); 505 506 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 507 struct rdma_cm_event *event); 508 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 509 void (*cm_connect_complete)(struct rds_connection *conn, 510 struct rdma_cm_event *event); 511 512 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 513 unsigned int avail); 514 void (*exit)(void); 515 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 516 struct rds_sock *rs, u32 *key_ret); 517 void (*sync_mr)(void *trans_private, int direction); 518 void (*free_mr)(void *trans_private, int invalidate); 519 void (*flush_mrs)(void); 520 }; 521 522 struct rds_sock { 523 struct sock rs_sk; 524 525 u64 rs_user_addr; 526 u64 rs_user_bytes; 527 528 /* 529 * bound_addr used for both incoming and outgoing, no INADDR_ANY 530 * support. 531 */ 532 struct rhash_head rs_bound_node; 533 u64 rs_bound_key; 534 __be32 rs_bound_addr; 535 __be32 rs_conn_addr; 536 __be16 rs_bound_port; 537 __be16 rs_conn_port; 538 struct rds_transport *rs_transport; 539 540 /* 541 * rds_sendmsg caches the conn it used the last time around. 542 * This helps avoid costly lookups. 543 */ 544 struct rds_connection *rs_conn; 545 546 /* flag indicating we were congested or not */ 547 int rs_congested; 548 /* seen congestion (ENOBUFS) when sending? */ 549 int rs_seen_congestion; 550 551 /* rs_lock protects all these adjacent members before the newline */ 552 spinlock_t rs_lock; 553 struct list_head rs_send_queue; 554 u32 rs_snd_bytes; 555 int rs_rcv_bytes; 556 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 557 558 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 559 * to decide whether the application should be woken up. 560 * If not set, we use rs_cong_track to find out whether a cong map 561 * update arrived. 562 */ 563 uint64_t rs_cong_mask; 564 uint64_t rs_cong_notify; 565 struct list_head rs_cong_list; 566 unsigned long rs_cong_track; 567 568 /* 569 * rs_recv_lock protects the receive queue, and is 570 * used to serialize with rds_release. 571 */ 572 rwlock_t rs_recv_lock; 573 struct list_head rs_recv_queue; 574 575 /* just for stats reporting */ 576 struct list_head rs_item; 577 578 /* these have their own lock */ 579 spinlock_t rs_rdma_lock; 580 struct rb_root rs_rdma_keys; 581 582 /* Socket options - in case there will be more */ 583 unsigned char rs_recverr, 584 rs_cong_monitor; 585 u32 rs_hash_initval; 586 587 /* Socket receive path trace points*/ 588 u8 rs_rx_traces; 589 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 590 }; 591 592 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 593 { 594 return container_of(sk, struct rds_sock, rs_sk); 595 } 596 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 597 { 598 return &rs->rs_sk; 599 } 600 601 /* 602 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 603 * to account for overhead. We don't account for overhead, we just apply 604 * the number of payload bytes to the specified value. 605 */ 606 static inline int rds_sk_sndbuf(struct rds_sock *rs) 607 { 608 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 609 } 610 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 611 { 612 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 613 } 614 615 struct rds_statistics { 616 uint64_t s_conn_reset; 617 uint64_t s_recv_drop_bad_checksum; 618 uint64_t s_recv_drop_old_seq; 619 uint64_t s_recv_drop_no_sock; 620 uint64_t s_recv_drop_dead_sock; 621 uint64_t s_recv_deliver_raced; 622 uint64_t s_recv_delivered; 623 uint64_t s_recv_queued; 624 uint64_t s_recv_immediate_retry; 625 uint64_t s_recv_delayed_retry; 626 uint64_t s_recv_ack_required; 627 uint64_t s_recv_rdma_bytes; 628 uint64_t s_recv_ping; 629 uint64_t s_send_queue_empty; 630 uint64_t s_send_queue_full; 631 uint64_t s_send_lock_contention; 632 uint64_t s_send_lock_queue_raced; 633 uint64_t s_send_immediate_retry; 634 uint64_t s_send_delayed_retry; 635 uint64_t s_send_drop_acked; 636 uint64_t s_send_ack_required; 637 uint64_t s_send_queued; 638 uint64_t s_send_rdma; 639 uint64_t s_send_rdma_bytes; 640 uint64_t s_send_pong; 641 uint64_t s_page_remainder_hit; 642 uint64_t s_page_remainder_miss; 643 uint64_t s_copy_to_user; 644 uint64_t s_copy_from_user; 645 uint64_t s_cong_update_queued; 646 uint64_t s_cong_update_received; 647 uint64_t s_cong_send_error; 648 uint64_t s_cong_send_blocked; 649 uint64_t s_recv_bytes_added_to_socket; 650 uint64_t s_recv_bytes_removed_from_socket; 651 652 }; 653 654 /* af_rds.c */ 655 void rds_sock_addref(struct rds_sock *rs); 656 void rds_sock_put(struct rds_sock *rs); 657 void rds_wake_sk_sleep(struct rds_sock *rs); 658 static inline void __rds_wake_sk_sleep(struct sock *sk) 659 { 660 wait_queue_head_t *waitq = sk_sleep(sk); 661 662 if (!sock_flag(sk, SOCK_DEAD) && waitq) 663 wake_up(waitq); 664 } 665 extern wait_queue_head_t rds_poll_waitq; 666 667 668 /* bind.c */ 669 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 670 void rds_remove_bound(struct rds_sock *rs); 671 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 672 int rds_bind_lock_init(void); 673 void rds_bind_lock_destroy(void); 674 675 /* cong.c */ 676 int rds_cong_get_maps(struct rds_connection *conn); 677 void rds_cong_add_conn(struct rds_connection *conn); 678 void rds_cong_remove_conn(struct rds_connection *conn); 679 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 680 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 681 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 682 void rds_cong_queue_updates(struct rds_cong_map *map); 683 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 684 int rds_cong_updated_since(unsigned long *recent); 685 void rds_cong_add_socket(struct rds_sock *); 686 void rds_cong_remove_socket(struct rds_sock *); 687 void rds_cong_exit(void); 688 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 689 690 /* conn.c */ 691 extern u32 rds_gen_num; 692 int rds_conn_init(void); 693 void rds_conn_exit(void); 694 struct rds_connection *rds_conn_create(struct net *net, 695 __be32 laddr, __be32 faddr, 696 struct rds_transport *trans, gfp_t gfp); 697 struct rds_connection *rds_conn_create_outgoing(struct net *net, 698 __be32 laddr, __be32 faddr, 699 struct rds_transport *trans, gfp_t gfp); 700 void rds_conn_shutdown(struct rds_conn_path *cpath); 701 void rds_conn_destroy(struct rds_connection *conn); 702 void rds_conn_drop(struct rds_connection *conn); 703 void rds_conn_path_drop(struct rds_conn_path *cpath); 704 void rds_conn_connect_if_down(struct rds_connection *conn); 705 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 706 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 707 struct rds_info_iterator *iter, 708 struct rds_info_lengths *lens, 709 int (*visitor)(struct rds_connection *, void *), 710 size_t item_len); 711 712 __printf(2, 3) 713 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 714 #define rds_conn_path_error(cp, fmt...) \ 715 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 716 717 static inline int 718 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 719 { 720 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 721 } 722 723 static inline int 724 rds_conn_transition(struct rds_connection *conn, int old, int new) 725 { 726 WARN_ON(conn->c_trans->t_mp_capable); 727 return rds_conn_path_transition(&conn->c_path[0], old, new); 728 } 729 730 static inline int 731 rds_conn_path_state(struct rds_conn_path *cp) 732 { 733 return atomic_read(&cp->cp_state); 734 } 735 736 static inline int 737 rds_conn_state(struct rds_connection *conn) 738 { 739 WARN_ON(conn->c_trans->t_mp_capable); 740 return rds_conn_path_state(&conn->c_path[0]); 741 } 742 743 static inline int 744 rds_conn_path_up(struct rds_conn_path *cp) 745 { 746 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 747 } 748 749 static inline int 750 rds_conn_up(struct rds_connection *conn) 751 { 752 WARN_ON(conn->c_trans->t_mp_capable); 753 return rds_conn_path_up(&conn->c_path[0]); 754 } 755 756 static inline int 757 rds_conn_path_connecting(struct rds_conn_path *cp) 758 { 759 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 760 } 761 762 static inline int 763 rds_conn_connecting(struct rds_connection *conn) 764 { 765 WARN_ON(conn->c_trans->t_mp_capable); 766 return rds_conn_path_connecting(&conn->c_path[0]); 767 } 768 769 /* message.c */ 770 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 771 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 772 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 773 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 774 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 775 __be16 dport, u64 seq); 776 int rds_message_add_extension(struct rds_header *hdr, 777 unsigned int type, const void *data, unsigned int len); 778 int rds_message_next_extension(struct rds_header *hdr, 779 unsigned int *pos, void *buf, unsigned int *buflen); 780 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 781 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 782 void rds_message_inc_free(struct rds_incoming *inc); 783 void rds_message_addref(struct rds_message *rm); 784 void rds_message_put(struct rds_message *rm); 785 void rds_message_wait(struct rds_message *rm); 786 void rds_message_unmapped(struct rds_message *rm); 787 788 static inline void rds_message_make_checksum(struct rds_header *hdr) 789 { 790 hdr->h_csum = 0; 791 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 792 } 793 794 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 795 { 796 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 797 } 798 799 800 /* page.c */ 801 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 802 gfp_t gfp); 803 void rds_page_exit(void); 804 805 /* recv.c */ 806 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 807 __be32 saddr); 808 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 809 __be32 saddr); 810 void rds_inc_put(struct rds_incoming *inc); 811 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 812 struct rds_incoming *inc, gfp_t gfp); 813 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 814 int msg_flags); 815 void rds_clear_recv_queue(struct rds_sock *rs); 816 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 817 void rds_inc_info_copy(struct rds_incoming *inc, 818 struct rds_info_iterator *iter, 819 __be32 saddr, __be32 daddr, int flip); 820 821 /* send.c */ 822 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 823 void rds_send_path_reset(struct rds_conn_path *conn); 824 int rds_send_xmit(struct rds_conn_path *cp); 825 struct sockaddr_in; 826 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 827 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 828 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 829 is_acked_func is_acked); 830 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 831 is_acked_func is_acked); 832 void rds_send_ping(struct rds_connection *conn, int cp_index); 833 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 834 835 /* rdma.c */ 836 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 837 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 838 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 839 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 840 void rds_rdma_drop_keys(struct rds_sock *rs); 841 int rds_rdma_extra_size(struct rds_rdma_args *args); 842 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 843 struct cmsghdr *cmsg); 844 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 845 struct cmsghdr *cmsg); 846 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 847 struct cmsghdr *cmsg); 848 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 849 struct cmsghdr *cmsg); 850 void rds_rdma_free_op(struct rm_rdma_op *ro); 851 void rds_atomic_free_op(struct rm_atomic_op *ao); 852 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 853 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 854 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 855 struct cmsghdr *cmsg); 856 857 void __rds_put_mr_final(struct rds_mr *mr); 858 static inline void rds_mr_put(struct rds_mr *mr) 859 { 860 if (refcount_dec_and_test(&mr->r_refcount)) 861 __rds_put_mr_final(mr); 862 } 863 864 /* stats.c */ 865 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 866 #define rds_stats_inc_which(which, member) do { \ 867 per_cpu(which, get_cpu()).member++; \ 868 put_cpu(); \ 869 } while (0) 870 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 871 #define rds_stats_add_which(which, member, count) do { \ 872 per_cpu(which, get_cpu()).member += count; \ 873 put_cpu(); \ 874 } while (0) 875 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 876 int rds_stats_init(void); 877 void rds_stats_exit(void); 878 void rds_stats_info_copy(struct rds_info_iterator *iter, 879 uint64_t *values, const char *const *names, 880 size_t nr); 881 882 /* sysctl.c */ 883 int rds_sysctl_init(void); 884 void rds_sysctl_exit(void); 885 extern unsigned long rds_sysctl_sndbuf_min; 886 extern unsigned long rds_sysctl_sndbuf_default; 887 extern unsigned long rds_sysctl_sndbuf_max; 888 extern unsigned long rds_sysctl_reconnect_min_jiffies; 889 extern unsigned long rds_sysctl_reconnect_max_jiffies; 890 extern unsigned int rds_sysctl_max_unacked_packets; 891 extern unsigned int rds_sysctl_max_unacked_bytes; 892 extern unsigned int rds_sysctl_ping_enable; 893 extern unsigned long rds_sysctl_trace_flags; 894 extern unsigned int rds_sysctl_trace_level; 895 896 /* threads.c */ 897 int rds_threads_init(void); 898 void rds_threads_exit(void); 899 extern struct workqueue_struct *rds_wq; 900 void rds_queue_reconnect(struct rds_conn_path *cp); 901 void rds_connect_worker(struct work_struct *); 902 void rds_shutdown_worker(struct work_struct *); 903 void rds_send_worker(struct work_struct *); 904 void rds_recv_worker(struct work_struct *); 905 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 906 void rds_connect_complete(struct rds_connection *conn); 907 908 /* transport.c */ 909 void rds_trans_register(struct rds_transport *trans); 910 void rds_trans_unregister(struct rds_transport *trans); 911 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 912 void rds_trans_put(struct rds_transport *trans); 913 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 914 unsigned int avail); 915 struct rds_transport *rds_trans_get(int t_type); 916 int rds_trans_init(void); 917 void rds_trans_exit(void); 918 919 #endif 920