1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _RDS_RDS_H 3 #define _RDS_RDS_H 4 5 #include <net/sock.h> 6 #include <linux/scatterlist.h> 7 #include <linux/highmem.h> 8 #include <rdma/rdma_cm.h> 9 #include <linux/mutex.h> 10 #include <linux/rds.h> 11 #include <linux/rhashtable.h> 12 #include <linux/refcount.h> 13 14 #include "info.h" 15 16 /* 17 * RDS Network protocol version 18 */ 19 #define RDS_PROTOCOL_3_0 0x0300 20 #define RDS_PROTOCOL_3_1 0x0301 21 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 22 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) 23 #define RDS_PROTOCOL_MINOR(v) ((v) & 255) 24 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) 25 26 /* 27 * XXX randomly chosen, but at least seems to be unused: 28 * # 18464-18768 Unassigned 29 * We should do better. We want a reserved port to discourage unpriv'ed 30 * userspace from listening. 31 */ 32 #define RDS_PORT 18634 33 34 #ifdef ATOMIC64_INIT 35 #define KERNEL_HAS_ATOMIC64 36 #endif 37 38 #ifdef RDS_DEBUG 39 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 40 #else 41 /* sigh, pr_debug() causes unused variable warnings */ 42 static inline __printf(1, 2) 43 void rdsdebug(char *fmt, ...) 44 { 45 } 46 #endif 47 48 /* XXX is there one of these somewhere? */ 49 #define ceil(x, y) \ 50 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) 51 52 #define RDS_FRAG_SHIFT 12 53 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 54 55 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ 56 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) 57 58 #define RDS_CONG_MAP_BYTES (65536 / 8) 59 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 60 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 61 62 struct rds_cong_map { 63 struct rb_node m_rb_node; 64 __be32 m_addr; 65 wait_queue_head_t m_waitq; 66 struct list_head m_conn_list; 67 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 68 }; 69 70 71 /* 72 * This is how we will track the connection state: 73 * A connection is always in one of the following 74 * states. Updates to the state are atomic and imply 75 * a memory barrier. 76 */ 77 enum { 78 RDS_CONN_DOWN = 0, 79 RDS_CONN_CONNECTING, 80 RDS_CONN_DISCONNECTING, 81 RDS_CONN_UP, 82 RDS_CONN_RESETTING, 83 RDS_CONN_ERROR, 84 }; 85 86 /* Bits for c_flags */ 87 #define RDS_LL_SEND_FULL 0 88 #define RDS_RECONNECT_PENDING 1 89 #define RDS_IN_XMIT 2 90 #define RDS_RECV_REFILL 3 91 #define RDS_DESTROY_PENDING 4 92 93 /* Max number of multipaths per RDS connection. Must be a power of 2 */ 94 #define RDS_MPATH_WORKERS 8 95 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ 96 (rs)->rs_hash_initval) & ((n) - 1)) 97 98 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) 99 100 /* Per mpath connection state */ 101 struct rds_conn_path { 102 struct rds_connection *cp_conn; 103 struct rds_message *cp_xmit_rm; 104 unsigned long cp_xmit_sg; 105 unsigned int cp_xmit_hdr_off; 106 unsigned int cp_xmit_data_off; 107 unsigned int cp_xmit_atomic_sent; 108 unsigned int cp_xmit_rdma_sent; 109 unsigned int cp_xmit_data_sent; 110 111 spinlock_t cp_lock; /* protect msg queues */ 112 u64 cp_next_tx_seq; 113 struct list_head cp_send_queue; 114 struct list_head cp_retrans; 115 116 u64 cp_next_rx_seq; 117 118 void *cp_transport_data; 119 120 atomic_t cp_state; 121 unsigned long cp_send_gen; 122 unsigned long cp_flags; 123 unsigned long cp_reconnect_jiffies; 124 struct delayed_work cp_send_w; 125 struct delayed_work cp_recv_w; 126 struct delayed_work cp_conn_w; 127 struct work_struct cp_down_w; 128 struct mutex cp_cm_lock; /* protect cp_state & cm */ 129 wait_queue_head_t cp_waitq; 130 131 unsigned int cp_unacked_packets; 132 unsigned int cp_unacked_bytes; 133 unsigned int cp_index; 134 }; 135 136 /* One rds_connection per RDS address pair */ 137 struct rds_connection { 138 struct hlist_node c_hash_node; 139 __be32 c_laddr; 140 __be32 c_faddr; 141 unsigned int c_loopback:1, 142 c_ping_triggered:1, 143 c_pad_to_32:30; 144 int c_npaths; 145 struct rds_connection *c_passive; 146 struct rds_transport *c_trans; 147 148 struct rds_cong_map *c_lcong; 149 struct rds_cong_map *c_fcong; 150 151 /* Protocol version */ 152 unsigned int c_version; 153 possible_net_t c_net; 154 155 struct list_head c_map_item; 156 unsigned long c_map_queued; 157 158 struct rds_conn_path *c_path; 159 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 160 161 u32 c_my_gen_num; 162 u32 c_peer_gen_num; 163 }; 164 165 static inline 166 struct net *rds_conn_net(struct rds_connection *conn) 167 { 168 return read_pnet(&conn->c_net); 169 } 170 171 static inline 172 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 173 { 174 write_pnet(&conn->c_net, net); 175 } 176 177 #define RDS_FLAG_CONG_BITMAP 0x01 178 #define RDS_FLAG_ACK_REQUIRED 0x02 179 #define RDS_FLAG_RETRANSMITTED 0x04 180 #define RDS_MAX_ADV_CREDIT 255 181 182 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 183 * probe to exchange control information before establishing a connection. 184 * Currently the control information that is exchanged is the number of 185 * supported paths. If the peer is a legacy (older kernel revision) peer, 186 * it would return a pong message without additional control information 187 * that would then alert the sender that the peer was an older rev. 188 */ 189 #define RDS_FLAG_PROBE_PORT 1 190 #define RDS_HS_PROBE(sport, dport) \ 191 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 192 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 193 /* 194 * Maximum space available for extension headers. 195 */ 196 #define RDS_HEADER_EXT_SPACE 16 197 198 struct rds_header { 199 __be64 h_sequence; 200 __be64 h_ack; 201 __be32 h_len; 202 __be16 h_sport; 203 __be16 h_dport; 204 u8 h_flags; 205 u8 h_credit; 206 u8 h_padding[4]; 207 __sum16 h_csum; 208 209 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 210 }; 211 212 /* 213 * Reserved - indicates end of extensions 214 */ 215 #define RDS_EXTHDR_NONE 0 216 217 /* 218 * This extension header is included in the very 219 * first message that is sent on a new connection, 220 * and identifies the protocol level. This will help 221 * rolling updates if a future change requires breaking 222 * the protocol. 223 * NB: This is no longer true for IB, where we do a version 224 * negotiation during the connection setup phase (protocol 225 * version information is included in the RDMA CM private data). 226 */ 227 #define RDS_EXTHDR_VERSION 1 228 struct rds_ext_header_version { 229 __be32 h_version; 230 }; 231 232 /* 233 * This extension header is included in the RDS message 234 * chasing an RDMA operation. 235 */ 236 #define RDS_EXTHDR_RDMA 2 237 struct rds_ext_header_rdma { 238 __be32 h_rdma_rkey; 239 }; 240 241 /* 242 * This extension header tells the peer about the 243 * destination <R_Key,offset> of the requested RDMA 244 * operation. 245 */ 246 #define RDS_EXTHDR_RDMA_DEST 3 247 struct rds_ext_header_rdma_dest { 248 __be32 h_rdma_rkey; 249 __be32 h_rdma_offset; 250 }; 251 252 /* Extension header announcing number of paths. 253 * Implicit length = 2 bytes. 254 */ 255 #define RDS_EXTHDR_NPATHS 5 256 #define RDS_EXTHDR_GEN_NUM 6 257 258 #define __RDS_EXTHDR_MAX 16 /* for now */ 259 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) 260 #define RDS_MSG_RX_HDR 0 261 #define RDS_MSG_RX_START 1 262 #define RDS_MSG_RX_END 2 263 #define RDS_MSG_RX_CMSG 3 264 265 struct rds_incoming { 266 refcount_t i_refcount; 267 struct list_head i_item; 268 struct rds_connection *i_conn; 269 struct rds_conn_path *i_conn_path; 270 struct rds_header i_hdr; 271 unsigned long i_rx_jiffies; 272 __be32 i_saddr; 273 274 rds_rdma_cookie_t i_rdma_cookie; 275 struct timeval i_rx_tstamp; 276 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 277 }; 278 279 struct rds_mr { 280 struct rb_node r_rb_node; 281 refcount_t r_refcount; 282 u32 r_key; 283 284 /* A copy of the creation flags */ 285 unsigned int r_use_once:1; 286 unsigned int r_invalidate:1; 287 unsigned int r_write:1; 288 289 /* This is for RDS_MR_DEAD. 290 * It would be nice & consistent to make this part of the above 291 * bit field here, but we need to use test_and_set_bit. 292 */ 293 unsigned long r_state; 294 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 295 struct rds_transport *r_trans; 296 void *r_trans_private; 297 }; 298 299 /* Flags for mr->r_state */ 300 #define RDS_MR_DEAD 0 301 302 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 303 { 304 return r_key | (((u64) offset) << 32); 305 } 306 307 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 308 { 309 return cookie; 310 } 311 312 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 313 { 314 return cookie >> 32; 315 } 316 317 /* atomic operation types */ 318 #define RDS_ATOMIC_TYPE_CSWP 0 319 #define RDS_ATOMIC_TYPE_FADD 1 320 321 /* 322 * m_sock_item and m_conn_item are on lists that are serialized under 323 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 324 * the message will not be put back on the retransmit list after being sent. 325 * messages that are canceled while being sent rely on this. 326 * 327 * m_inc is used by loopback so that it can pass an incoming message straight 328 * back up into the rx path. It embeds a wire header which is also used by 329 * the send path, which is kind of awkward. 330 * 331 * m_sock_item indicates the message's presence on a socket's send or receive 332 * queue. m_rs will point to that socket. 333 * 334 * m_daddr is used by cancellation to prune messages to a given destination. 335 * 336 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 337 * nesting. As paths iterate over messages on a sock, or conn, they must 338 * also lock the conn, or sock, to remove the message from those lists too. 339 * Testing the flag to determine if the message is still on the lists lets 340 * us avoid testing the list_head directly. That means each path can use 341 * the message's list_head to keep it on a local list while juggling locks 342 * without confusing the other path. 343 * 344 * m_ack_seq is an optional field set by transports who need a different 345 * sequence number range to invalidate. They can use this in a callback 346 * that they pass to rds_send_drop_acked() to see if each message has been 347 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 348 * had ack_seq set yet. 349 */ 350 #define RDS_MSG_ON_SOCK 1 351 #define RDS_MSG_ON_CONN 2 352 #define RDS_MSG_HAS_ACK_SEQ 3 353 #define RDS_MSG_ACK_REQUIRED 4 354 #define RDS_MSG_RETRANSMITTED 5 355 #define RDS_MSG_MAPPED 6 356 #define RDS_MSG_PAGEVEC 7 357 #define RDS_MSG_FLUSH 8 358 359 struct rds_message { 360 refcount_t m_refcount; 361 struct list_head m_sock_item; 362 struct list_head m_conn_item; 363 struct rds_incoming m_inc; 364 u64 m_ack_seq; 365 __be32 m_daddr; 366 unsigned long m_flags; 367 368 /* Never access m_rs without holding m_rs_lock. 369 * Lock nesting is 370 * rm->m_rs_lock 371 * -> rs->rs_lock 372 */ 373 spinlock_t m_rs_lock; 374 wait_queue_head_t m_flush_wait; 375 376 struct rds_sock *m_rs; 377 378 /* cookie to send to remote, in rds header */ 379 rds_rdma_cookie_t m_rdma_cookie; 380 381 unsigned int m_used_sgs; 382 unsigned int m_total_sgs; 383 384 void *m_final_op; 385 386 struct { 387 struct rm_atomic_op { 388 int op_type; 389 union { 390 struct { 391 uint64_t compare; 392 uint64_t swap; 393 uint64_t compare_mask; 394 uint64_t swap_mask; 395 } op_m_cswp; 396 struct { 397 uint64_t add; 398 uint64_t nocarry_mask; 399 } op_m_fadd; 400 }; 401 402 u32 op_rkey; 403 u64 op_remote_addr; 404 unsigned int op_notify:1; 405 unsigned int op_recverr:1; 406 unsigned int op_mapped:1; 407 unsigned int op_silent:1; 408 unsigned int op_active:1; 409 struct scatterlist *op_sg; 410 struct rds_notifier *op_notifier; 411 412 struct rds_mr *op_rdma_mr; 413 } atomic; 414 struct rm_rdma_op { 415 u32 op_rkey; 416 u64 op_remote_addr; 417 unsigned int op_write:1; 418 unsigned int op_fence:1; 419 unsigned int op_notify:1; 420 unsigned int op_recverr:1; 421 unsigned int op_mapped:1; 422 unsigned int op_silent:1; 423 unsigned int op_active:1; 424 unsigned int op_bytes; 425 unsigned int op_nents; 426 unsigned int op_count; 427 struct scatterlist *op_sg; 428 struct rds_notifier *op_notifier; 429 430 struct rds_mr *op_rdma_mr; 431 } rdma; 432 struct rm_data_op { 433 unsigned int op_active:1; 434 unsigned int op_notify:1; 435 unsigned int op_nents; 436 unsigned int op_count; 437 unsigned int op_dmasg; 438 unsigned int op_dmaoff; 439 struct scatterlist *op_sg; 440 } data; 441 }; 442 }; 443 444 /* 445 * The RDS notifier is used (optionally) to tell the application about 446 * completed RDMA operations. Rather than keeping the whole rds message 447 * around on the queue, we allocate a small notifier that is put on the 448 * socket's notifier_list. Notifications are delivered to the application 449 * through control messages. 450 */ 451 struct rds_notifier { 452 struct list_head n_list; 453 uint64_t n_user_token; 454 int n_status; 455 }; 456 457 /** 458 * struct rds_transport - transport specific behavioural hooks 459 * 460 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 461 * part of a message. The caller serializes on the send_sem so this 462 * doesn't need to be reentrant for a given conn. The header must be 463 * sent before the data payload. .xmit must be prepared to send a 464 * message with no data payload. .xmit should return the number of 465 * bytes that were sent down the connection, including header bytes. 466 * Returning 0 tells the caller that it doesn't need to perform any 467 * additional work now. This is usually the case when the transport has 468 * filled the sending queue for its connection and will handle 469 * triggering the rds thread to continue the send when space becomes 470 * available. Returning -EAGAIN tells the caller to retry the send 471 * immediately. Returning -ENOMEM tells the caller to retry the send at 472 * some point in the future. 473 * 474 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 475 * it returns the connection can not call rds_recv_incoming(). 476 * This will only be called once after conn_connect returns 477 * non-zero success and will The caller serializes this with 478 * the send and connecting paths (xmit_* and conn_*). The 479 * transport is responsible for other serialization, including 480 * rds_recv_incoming(). This is called in process context but 481 * should try hard not to block. 482 */ 483 484 struct rds_transport { 485 char t_name[TRANSNAMSIZ]; 486 struct list_head t_item; 487 struct module *t_owner; 488 unsigned int t_prefer_loopback:1, 489 t_mp_capable:1; 490 unsigned int t_type; 491 492 int (*laddr_check)(struct net *net, __be32 addr); 493 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 494 void (*conn_free)(void *data); 495 int (*conn_path_connect)(struct rds_conn_path *cp); 496 void (*conn_path_shutdown)(struct rds_conn_path *conn); 497 void (*xmit_path_prepare)(struct rds_conn_path *cp); 498 void (*xmit_path_complete)(struct rds_conn_path *cp); 499 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 500 unsigned int hdr_off, unsigned int sg, unsigned int off); 501 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 502 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 503 int (*recv_path)(struct rds_conn_path *cp); 504 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 505 void (*inc_free)(struct rds_incoming *inc); 506 507 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 508 struct rdma_cm_event *event); 509 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); 510 void (*cm_connect_complete)(struct rds_connection *conn, 511 struct rdma_cm_event *event); 512 513 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 514 unsigned int avail); 515 void (*exit)(void); 516 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 517 struct rds_sock *rs, u32 *key_ret); 518 void (*sync_mr)(void *trans_private, int direction); 519 void (*free_mr)(void *trans_private, int invalidate); 520 void (*flush_mrs)(void); 521 bool (*t_unloading)(struct rds_connection *conn); 522 }; 523 524 struct rds_sock { 525 struct sock rs_sk; 526 527 u64 rs_user_addr; 528 u64 rs_user_bytes; 529 530 /* 531 * bound_addr used for both incoming and outgoing, no INADDR_ANY 532 * support. 533 */ 534 struct rhash_head rs_bound_node; 535 u64 rs_bound_key; 536 __be32 rs_bound_addr; 537 __be32 rs_conn_addr; 538 __be16 rs_bound_port; 539 __be16 rs_conn_port; 540 struct rds_transport *rs_transport; 541 542 /* 543 * rds_sendmsg caches the conn it used the last time around. 544 * This helps avoid costly lookups. 545 */ 546 struct rds_connection *rs_conn; 547 548 /* flag indicating we were congested or not */ 549 int rs_congested; 550 /* seen congestion (ENOBUFS) when sending? */ 551 int rs_seen_congestion; 552 553 /* rs_lock protects all these adjacent members before the newline */ 554 spinlock_t rs_lock; 555 struct list_head rs_send_queue; 556 u32 rs_snd_bytes; 557 int rs_rcv_bytes; 558 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 559 560 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 561 * to decide whether the application should be woken up. 562 * If not set, we use rs_cong_track to find out whether a cong map 563 * update arrived. 564 */ 565 uint64_t rs_cong_mask; 566 uint64_t rs_cong_notify; 567 struct list_head rs_cong_list; 568 unsigned long rs_cong_track; 569 570 /* 571 * rs_recv_lock protects the receive queue, and is 572 * used to serialize with rds_release. 573 */ 574 rwlock_t rs_recv_lock; 575 struct list_head rs_recv_queue; 576 577 /* just for stats reporting */ 578 struct list_head rs_item; 579 580 /* these have their own lock */ 581 spinlock_t rs_rdma_lock; 582 struct rb_root rs_rdma_keys; 583 584 /* Socket options - in case there will be more */ 585 unsigned char rs_recverr, 586 rs_cong_monitor; 587 u32 rs_hash_initval; 588 589 /* Socket receive path trace points*/ 590 u8 rs_rx_traces; 591 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 592 }; 593 594 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 595 { 596 return container_of(sk, struct rds_sock, rs_sk); 597 } 598 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 599 { 600 return &rs->rs_sk; 601 } 602 603 /* 604 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 605 * to account for overhead. We don't account for overhead, we just apply 606 * the number of payload bytes to the specified value. 607 */ 608 static inline int rds_sk_sndbuf(struct rds_sock *rs) 609 { 610 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 611 } 612 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 613 { 614 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 615 } 616 617 struct rds_statistics { 618 uint64_t s_conn_reset; 619 uint64_t s_recv_drop_bad_checksum; 620 uint64_t s_recv_drop_old_seq; 621 uint64_t s_recv_drop_no_sock; 622 uint64_t s_recv_drop_dead_sock; 623 uint64_t s_recv_deliver_raced; 624 uint64_t s_recv_delivered; 625 uint64_t s_recv_queued; 626 uint64_t s_recv_immediate_retry; 627 uint64_t s_recv_delayed_retry; 628 uint64_t s_recv_ack_required; 629 uint64_t s_recv_rdma_bytes; 630 uint64_t s_recv_ping; 631 uint64_t s_send_queue_empty; 632 uint64_t s_send_queue_full; 633 uint64_t s_send_lock_contention; 634 uint64_t s_send_lock_queue_raced; 635 uint64_t s_send_immediate_retry; 636 uint64_t s_send_delayed_retry; 637 uint64_t s_send_drop_acked; 638 uint64_t s_send_ack_required; 639 uint64_t s_send_queued; 640 uint64_t s_send_rdma; 641 uint64_t s_send_rdma_bytes; 642 uint64_t s_send_pong; 643 uint64_t s_page_remainder_hit; 644 uint64_t s_page_remainder_miss; 645 uint64_t s_copy_to_user; 646 uint64_t s_copy_from_user; 647 uint64_t s_cong_update_queued; 648 uint64_t s_cong_update_received; 649 uint64_t s_cong_send_error; 650 uint64_t s_cong_send_blocked; 651 uint64_t s_recv_bytes_added_to_socket; 652 uint64_t s_recv_bytes_removed_from_socket; 653 654 }; 655 656 /* af_rds.c */ 657 void rds_sock_addref(struct rds_sock *rs); 658 void rds_sock_put(struct rds_sock *rs); 659 void rds_wake_sk_sleep(struct rds_sock *rs); 660 static inline void __rds_wake_sk_sleep(struct sock *sk) 661 { 662 wait_queue_head_t *waitq = sk_sleep(sk); 663 664 if (!sock_flag(sk, SOCK_DEAD) && waitq) 665 wake_up(waitq); 666 } 667 extern wait_queue_head_t rds_poll_waitq; 668 669 670 /* bind.c */ 671 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 672 void rds_remove_bound(struct rds_sock *rs); 673 struct rds_sock *rds_find_bound(__be32 addr, __be16 port); 674 int rds_bind_lock_init(void); 675 void rds_bind_lock_destroy(void); 676 677 /* cong.c */ 678 int rds_cong_get_maps(struct rds_connection *conn); 679 void rds_cong_add_conn(struct rds_connection *conn); 680 void rds_cong_remove_conn(struct rds_connection *conn); 681 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 682 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 683 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 684 void rds_cong_queue_updates(struct rds_cong_map *map); 685 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 686 int rds_cong_updated_since(unsigned long *recent); 687 void rds_cong_add_socket(struct rds_sock *); 688 void rds_cong_remove_socket(struct rds_sock *); 689 void rds_cong_exit(void); 690 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 691 692 /* conn.c */ 693 extern u32 rds_gen_num; 694 int rds_conn_init(void); 695 void rds_conn_exit(void); 696 struct rds_connection *rds_conn_create(struct net *net, 697 __be32 laddr, __be32 faddr, 698 struct rds_transport *trans, gfp_t gfp); 699 struct rds_connection *rds_conn_create_outgoing(struct net *net, 700 __be32 laddr, __be32 faddr, 701 struct rds_transport *trans, gfp_t gfp); 702 void rds_conn_shutdown(struct rds_conn_path *cpath); 703 void rds_conn_destroy(struct rds_connection *conn); 704 void rds_conn_drop(struct rds_connection *conn); 705 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy); 706 void rds_conn_connect_if_down(struct rds_connection *conn); 707 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 708 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 709 struct rds_info_iterator *iter, 710 struct rds_info_lengths *lens, 711 int (*visitor)(struct rds_connection *, void *), 712 size_t item_len); 713 714 __printf(2, 3) 715 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 716 #define rds_conn_path_error(cp, fmt...) \ 717 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 718 719 static inline int 720 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 721 { 722 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 723 } 724 725 static inline int 726 rds_conn_transition(struct rds_connection *conn, int old, int new) 727 { 728 WARN_ON(conn->c_trans->t_mp_capable); 729 return rds_conn_path_transition(&conn->c_path[0], old, new); 730 } 731 732 static inline int 733 rds_conn_path_state(struct rds_conn_path *cp) 734 { 735 return atomic_read(&cp->cp_state); 736 } 737 738 static inline int 739 rds_conn_state(struct rds_connection *conn) 740 { 741 WARN_ON(conn->c_trans->t_mp_capable); 742 return rds_conn_path_state(&conn->c_path[0]); 743 } 744 745 static inline int 746 rds_conn_path_up(struct rds_conn_path *cp) 747 { 748 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 749 } 750 751 static inline int 752 rds_conn_up(struct rds_connection *conn) 753 { 754 WARN_ON(conn->c_trans->t_mp_capable); 755 return rds_conn_path_up(&conn->c_path[0]); 756 } 757 758 static inline int 759 rds_conn_path_connecting(struct rds_conn_path *cp) 760 { 761 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 762 } 763 764 static inline int 765 rds_conn_connecting(struct rds_connection *conn) 766 { 767 WARN_ON(conn->c_trans->t_mp_capable); 768 return rds_conn_path_connecting(&conn->c_path[0]); 769 } 770 771 /* message.c */ 772 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 773 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); 774 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); 775 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 776 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 777 __be16 dport, u64 seq); 778 int rds_message_add_extension(struct rds_header *hdr, 779 unsigned int type, const void *data, unsigned int len); 780 int rds_message_next_extension(struct rds_header *hdr, 781 unsigned int *pos, void *buf, unsigned int *buflen); 782 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 783 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 784 void rds_message_inc_free(struct rds_incoming *inc); 785 void rds_message_addref(struct rds_message *rm); 786 void rds_message_put(struct rds_message *rm); 787 void rds_message_wait(struct rds_message *rm); 788 void rds_message_unmapped(struct rds_message *rm); 789 790 static inline void rds_message_make_checksum(struct rds_header *hdr) 791 { 792 hdr->h_csum = 0; 793 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 794 } 795 796 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 797 { 798 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 799 } 800 801 802 /* page.c */ 803 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 804 gfp_t gfp); 805 void rds_page_exit(void); 806 807 /* recv.c */ 808 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 809 __be32 saddr); 810 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 811 __be32 saddr); 812 void rds_inc_put(struct rds_incoming *inc); 813 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, 814 struct rds_incoming *inc, gfp_t gfp); 815 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 816 int msg_flags); 817 void rds_clear_recv_queue(struct rds_sock *rs); 818 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 819 void rds_inc_info_copy(struct rds_incoming *inc, 820 struct rds_info_iterator *iter, 821 __be32 saddr, __be32 daddr, int flip); 822 823 /* send.c */ 824 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 825 void rds_send_path_reset(struct rds_conn_path *conn); 826 int rds_send_xmit(struct rds_conn_path *cp); 827 struct sockaddr_in; 828 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); 829 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 830 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 831 is_acked_func is_acked); 832 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 833 is_acked_func is_acked); 834 void rds_send_ping(struct rds_connection *conn, int cp_index); 835 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 836 837 /* rdma.c */ 838 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 839 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 840 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 841 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 842 void rds_rdma_drop_keys(struct rds_sock *rs); 843 int rds_rdma_extra_size(struct rds_rdma_args *args); 844 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 845 struct cmsghdr *cmsg); 846 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 847 struct cmsghdr *cmsg); 848 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 849 struct cmsghdr *cmsg); 850 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 851 struct cmsghdr *cmsg); 852 void rds_rdma_free_op(struct rm_rdma_op *ro); 853 void rds_atomic_free_op(struct rm_atomic_op *ao); 854 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 855 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 856 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 857 struct cmsghdr *cmsg); 858 859 void __rds_put_mr_final(struct rds_mr *mr); 860 static inline void rds_mr_put(struct rds_mr *mr) 861 { 862 if (refcount_dec_and_test(&mr->r_refcount)) 863 __rds_put_mr_final(mr); 864 } 865 866 static inline bool rds_destroy_pending(struct rds_connection *conn) 867 { 868 return !check_net(rds_conn_net(conn)) || 869 (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn)); 870 } 871 872 /* stats.c */ 873 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 874 #define rds_stats_inc_which(which, member) do { \ 875 per_cpu(which, get_cpu()).member++; \ 876 put_cpu(); \ 877 } while (0) 878 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 879 #define rds_stats_add_which(which, member, count) do { \ 880 per_cpu(which, get_cpu()).member += count; \ 881 put_cpu(); \ 882 } while (0) 883 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 884 int rds_stats_init(void); 885 void rds_stats_exit(void); 886 void rds_stats_info_copy(struct rds_info_iterator *iter, 887 uint64_t *values, const char *const *names, 888 size_t nr); 889 890 /* sysctl.c */ 891 int rds_sysctl_init(void); 892 void rds_sysctl_exit(void); 893 extern unsigned long rds_sysctl_sndbuf_min; 894 extern unsigned long rds_sysctl_sndbuf_default; 895 extern unsigned long rds_sysctl_sndbuf_max; 896 extern unsigned long rds_sysctl_reconnect_min_jiffies; 897 extern unsigned long rds_sysctl_reconnect_max_jiffies; 898 extern unsigned int rds_sysctl_max_unacked_packets; 899 extern unsigned int rds_sysctl_max_unacked_bytes; 900 extern unsigned int rds_sysctl_ping_enable; 901 extern unsigned long rds_sysctl_trace_flags; 902 extern unsigned int rds_sysctl_trace_level; 903 904 /* threads.c */ 905 int rds_threads_init(void); 906 void rds_threads_exit(void); 907 extern struct workqueue_struct *rds_wq; 908 void rds_queue_reconnect(struct rds_conn_path *cp); 909 void rds_connect_worker(struct work_struct *); 910 void rds_shutdown_worker(struct work_struct *); 911 void rds_send_worker(struct work_struct *); 912 void rds_recv_worker(struct work_struct *); 913 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 914 void rds_connect_complete(struct rds_connection *conn); 915 916 /* transport.c */ 917 void rds_trans_register(struct rds_transport *trans); 918 void rds_trans_unregister(struct rds_transport *trans); 919 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); 920 void rds_trans_put(struct rds_transport *trans); 921 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 922 unsigned int avail); 923 struct rds_transport *rds_trans_get(int t_type); 924 int rds_trans_init(void); 925 void rds_trans_exit(void); 926 927 #endif 928