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 #include <linux/in6.h> 14 15 #include "info.h" 16 17 /* 18 * RDS Network protocol version 19 */ 20 #define RDS_PROTOCOL_3_0 0x0300 21 #define RDS_PROTOCOL_3_1 0x0301 22 #define RDS_PROTOCOL_4_0 0x0400 23 #define RDS_PROTOCOL_4_1 0x0401 24 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 25 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) 26 #define RDS_PROTOCOL_MINOR(v) ((v) & 255) 27 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) 28 #define RDS_PROTOCOL_COMPAT_VERSION RDS_PROTOCOL_3_1 29 30 /* The following ports, 16385, 18634, 18635, are registered with IANA as 31 * the ports to be used for RDS over TCP and UDP. Currently, only RDS over 32 * TCP and RDS over IB/RDMA are implemented. 18634 is the historical value 33 * used for the RDMA_CM listener port. RDS/TCP uses port 16385. After 34 * IPv6 work, RDMA_CM also uses 16385 as the listener port. 18634 is kept 35 * to ensure compatibility with older RDS modules. Those ports are defined 36 * in each transport's header file. 37 */ 38 #define RDS_PORT 18634 39 40 #ifdef ATOMIC64_INIT 41 #define KERNEL_HAS_ATOMIC64 42 #endif 43 44 #ifdef RDS_DEBUG 45 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) 46 #else 47 /* sigh, pr_debug() causes unused variable warnings */ 48 static inline __printf(1, 2) 49 void rdsdebug(char *fmt, ...) 50 { 51 } 52 #endif 53 54 #define RDS_FRAG_SHIFT 12 55 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) 56 57 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ 58 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) 59 60 #define RDS_CONG_MAP_BYTES (65536 / 8) 61 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) 62 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) 63 64 struct rds_cong_map { 65 struct rb_node m_rb_node; 66 struct in6_addr m_addr; 67 wait_queue_head_t m_waitq; 68 struct list_head m_conn_list; 69 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; 70 }; 71 72 73 /* 74 * This is how we will track the connection state: 75 * A connection is always in one of the following 76 * states. Updates to the state are atomic and imply 77 * a memory barrier. 78 */ 79 enum { 80 RDS_CONN_DOWN = 0, 81 RDS_CONN_CONNECTING, 82 RDS_CONN_DISCONNECTING, 83 RDS_CONN_UP, 84 RDS_CONN_RESETTING, 85 RDS_CONN_ERROR, 86 }; 87 88 /* Bits for c_flags */ 89 #define RDS_LL_SEND_FULL 0 90 #define RDS_RECONNECT_PENDING 1 91 #define RDS_IN_XMIT 2 92 #define RDS_RECV_REFILL 3 93 #define RDS_DESTROY_PENDING 4 94 95 /* Max number of multipaths per RDS connection. Must be a power of 2 */ 96 #define RDS_MPATH_WORKERS 8 97 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ 98 (rs)->rs_hash_initval) & ((n) - 1)) 99 100 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) 101 102 /* Per mpath connection state */ 103 struct rds_conn_path { 104 struct rds_connection *cp_conn; 105 struct rds_message *cp_xmit_rm; 106 unsigned long cp_xmit_sg; 107 unsigned int cp_xmit_hdr_off; 108 unsigned int cp_xmit_data_off; 109 unsigned int cp_xmit_atomic_sent; 110 unsigned int cp_xmit_rdma_sent; 111 unsigned int cp_xmit_data_sent; 112 113 spinlock_t cp_lock; /* protect msg queues */ 114 u64 cp_next_tx_seq; 115 struct list_head cp_send_queue; 116 struct list_head cp_retrans; 117 118 u64 cp_next_rx_seq; 119 120 void *cp_transport_data; 121 122 atomic_t cp_state; 123 unsigned long cp_send_gen; 124 unsigned long cp_flags; 125 unsigned long cp_reconnect_jiffies; 126 struct delayed_work cp_send_w; 127 struct delayed_work cp_recv_w; 128 struct delayed_work cp_conn_w; 129 struct work_struct cp_down_w; 130 struct mutex cp_cm_lock; /* protect cp_state & cm */ 131 wait_queue_head_t cp_waitq; 132 133 unsigned int cp_unacked_packets; 134 unsigned int cp_unacked_bytes; 135 unsigned int cp_index; 136 }; 137 138 /* One rds_connection per RDS address pair */ 139 struct rds_connection { 140 struct hlist_node c_hash_node; 141 struct in6_addr c_laddr; 142 struct in6_addr c_faddr; 143 int c_dev_if; /* ifindex used for this conn */ 144 int c_bound_if; /* ifindex of c_laddr */ 145 unsigned int c_loopback:1, 146 c_isv6:1, 147 c_ping_triggered:1, 148 c_pad_to_32:29; 149 int c_npaths; 150 struct rds_connection *c_passive; 151 struct rds_transport *c_trans; 152 153 struct rds_cong_map *c_lcong; 154 struct rds_cong_map *c_fcong; 155 156 /* Protocol version */ 157 unsigned int c_proposed_version; 158 unsigned int c_version; 159 possible_net_t c_net; 160 161 /* TOS */ 162 u8 c_tos; 163 164 struct list_head c_map_item; 165 unsigned long c_map_queued; 166 167 struct rds_conn_path *c_path; 168 wait_queue_head_t c_hs_waitq; /* handshake waitq */ 169 170 u32 c_my_gen_num; 171 u32 c_peer_gen_num; 172 }; 173 174 static inline 175 struct net *rds_conn_net(struct rds_connection *conn) 176 { 177 return read_pnet(&conn->c_net); 178 } 179 180 static inline 181 void rds_conn_net_set(struct rds_connection *conn, struct net *net) 182 { 183 write_pnet(&conn->c_net, net); 184 } 185 186 #define RDS_FLAG_CONG_BITMAP 0x01 187 #define RDS_FLAG_ACK_REQUIRED 0x02 188 #define RDS_FLAG_RETRANSMITTED 0x04 189 #define RDS_MAX_ADV_CREDIT 255 190 191 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping 192 * probe to exchange control information before establishing a connection. 193 * Currently the control information that is exchanged is the number of 194 * supported paths. If the peer is a legacy (older kernel revision) peer, 195 * it would return a pong message without additional control information 196 * that would then alert the sender that the peer was an older rev. 197 */ 198 #define RDS_FLAG_PROBE_PORT 1 199 #define RDS_HS_PROBE(sport, dport) \ 200 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ 201 (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) 202 /* 203 * Maximum space available for extension headers. 204 */ 205 #define RDS_HEADER_EXT_SPACE 16 206 207 struct rds_header { 208 __be64 h_sequence; 209 __be64 h_ack; 210 __be32 h_len; 211 __be16 h_sport; 212 __be16 h_dport; 213 u8 h_flags; 214 u8 h_credit; 215 u8 h_padding[4]; 216 __sum16 h_csum; 217 218 u8 h_exthdr[RDS_HEADER_EXT_SPACE]; 219 }; 220 221 /* 222 * Reserved - indicates end of extensions 223 */ 224 #define RDS_EXTHDR_NONE 0 225 226 /* 227 * This extension header is included in the very 228 * first message that is sent on a new connection, 229 * and identifies the protocol level. This will help 230 * rolling updates if a future change requires breaking 231 * the protocol. 232 * NB: This is no longer true for IB, where we do a version 233 * negotiation during the connection setup phase (protocol 234 * version information is included in the RDMA CM private data). 235 */ 236 #define RDS_EXTHDR_VERSION 1 237 struct rds_ext_header_version { 238 __be32 h_version; 239 }; 240 241 /* 242 * This extension header is included in the RDS message 243 * chasing an RDMA operation. 244 */ 245 #define RDS_EXTHDR_RDMA 2 246 struct rds_ext_header_rdma { 247 __be32 h_rdma_rkey; 248 }; 249 250 /* 251 * This extension header tells the peer about the 252 * destination <R_Key,offset> of the requested RDMA 253 * operation. 254 */ 255 #define RDS_EXTHDR_RDMA_DEST 3 256 struct rds_ext_header_rdma_dest { 257 __be32 h_rdma_rkey; 258 __be32 h_rdma_offset; 259 }; 260 261 /* Extension header announcing number of paths. 262 * Implicit length = 2 bytes. 263 */ 264 #define RDS_EXTHDR_NPATHS 5 265 #define RDS_EXTHDR_GEN_NUM 6 266 267 #define __RDS_EXTHDR_MAX 16 /* for now */ 268 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) 269 #define RDS_MSG_RX_HDR 0 270 #define RDS_MSG_RX_START 1 271 #define RDS_MSG_RX_END 2 272 #define RDS_MSG_RX_CMSG 3 273 274 struct rds_incoming { 275 refcount_t i_refcount; 276 struct list_head i_item; 277 struct rds_connection *i_conn; 278 struct rds_conn_path *i_conn_path; 279 struct rds_header i_hdr; 280 unsigned long i_rx_jiffies; 281 struct in6_addr i_saddr; 282 283 rds_rdma_cookie_t i_rdma_cookie; 284 ktime_t i_rx_tstamp; 285 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 286 }; 287 288 struct rds_mr { 289 struct rb_node r_rb_node; 290 refcount_t r_refcount; 291 u32 r_key; 292 293 /* A copy of the creation flags */ 294 unsigned int r_use_once:1; 295 unsigned int r_invalidate:1; 296 unsigned int r_write:1; 297 298 /* This is for RDS_MR_DEAD. 299 * It would be nice & consistent to make this part of the above 300 * bit field here, but we need to use test_and_set_bit. 301 */ 302 unsigned long r_state; 303 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 304 struct rds_transport *r_trans; 305 void *r_trans_private; 306 }; 307 308 /* Flags for mr->r_state */ 309 #define RDS_MR_DEAD 0 310 311 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 312 { 313 return r_key | (((u64) offset) << 32); 314 } 315 316 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 317 { 318 return cookie; 319 } 320 321 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 322 { 323 return cookie >> 32; 324 } 325 326 /* atomic operation types */ 327 #define RDS_ATOMIC_TYPE_CSWP 0 328 #define RDS_ATOMIC_TYPE_FADD 1 329 330 /* 331 * m_sock_item and m_conn_item are on lists that are serialized under 332 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 333 * the message will not be put back on the retransmit list after being sent. 334 * messages that are canceled while being sent rely on this. 335 * 336 * m_inc is used by loopback so that it can pass an incoming message straight 337 * back up into the rx path. It embeds a wire header which is also used by 338 * the send path, which is kind of awkward. 339 * 340 * m_sock_item indicates the message's presence on a socket's send or receive 341 * queue. m_rs will point to that socket. 342 * 343 * m_daddr is used by cancellation to prune messages to a given destination. 344 * 345 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 346 * nesting. As paths iterate over messages on a sock, or conn, they must 347 * also lock the conn, or sock, to remove the message from those lists too. 348 * Testing the flag to determine if the message is still on the lists lets 349 * us avoid testing the list_head directly. That means each path can use 350 * the message's list_head to keep it on a local list while juggling locks 351 * without confusing the other path. 352 * 353 * m_ack_seq is an optional field set by transports who need a different 354 * sequence number range to invalidate. They can use this in a callback 355 * that they pass to rds_send_drop_acked() to see if each message has been 356 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 357 * had ack_seq set yet. 358 */ 359 #define RDS_MSG_ON_SOCK 1 360 #define RDS_MSG_ON_CONN 2 361 #define RDS_MSG_HAS_ACK_SEQ 3 362 #define RDS_MSG_ACK_REQUIRED 4 363 #define RDS_MSG_RETRANSMITTED 5 364 #define RDS_MSG_MAPPED 6 365 #define RDS_MSG_PAGEVEC 7 366 #define RDS_MSG_FLUSH 8 367 368 struct rds_znotifier { 369 struct mmpin z_mmp; 370 u32 z_cookie; 371 }; 372 373 struct rds_msg_zcopy_info { 374 struct list_head rs_zcookie_next; 375 union { 376 struct rds_znotifier znotif; 377 struct rds_zcopy_cookies zcookies; 378 }; 379 }; 380 381 struct rds_msg_zcopy_queue { 382 struct list_head zcookie_head; 383 spinlock_t lock; /* protects zcookie_head queue */ 384 }; 385 386 static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q) 387 { 388 spin_lock_init(&q->lock); 389 INIT_LIST_HEAD(&q->zcookie_head); 390 } 391 392 struct rds_iov_vector { 393 struct rds_iovec *iov; 394 int len; 395 }; 396 397 struct rds_iov_vector_arr { 398 struct rds_iov_vector *vec; 399 int len; 400 int indx; 401 int incr; 402 }; 403 404 struct rds_message { 405 refcount_t m_refcount; 406 struct list_head m_sock_item; 407 struct list_head m_conn_item; 408 struct rds_incoming m_inc; 409 u64 m_ack_seq; 410 struct in6_addr m_daddr; 411 unsigned long m_flags; 412 413 /* Never access m_rs without holding m_rs_lock. 414 * Lock nesting is 415 * rm->m_rs_lock 416 * -> rs->rs_lock 417 */ 418 spinlock_t m_rs_lock; 419 wait_queue_head_t m_flush_wait; 420 421 struct rds_sock *m_rs; 422 423 /* cookie to send to remote, in rds header */ 424 rds_rdma_cookie_t m_rdma_cookie; 425 426 unsigned int m_used_sgs; 427 unsigned int m_total_sgs; 428 429 void *m_final_op; 430 431 struct { 432 struct rm_atomic_op { 433 int op_type; 434 union { 435 struct { 436 uint64_t compare; 437 uint64_t swap; 438 uint64_t compare_mask; 439 uint64_t swap_mask; 440 } op_m_cswp; 441 struct { 442 uint64_t add; 443 uint64_t nocarry_mask; 444 } op_m_fadd; 445 }; 446 447 u32 op_rkey; 448 u64 op_remote_addr; 449 unsigned int op_notify:1; 450 unsigned int op_recverr:1; 451 unsigned int op_mapped:1; 452 unsigned int op_silent:1; 453 unsigned int op_active:1; 454 struct scatterlist *op_sg; 455 struct rds_notifier *op_notifier; 456 457 struct rds_mr *op_rdma_mr; 458 } atomic; 459 struct rm_rdma_op { 460 u32 op_rkey; 461 u64 op_remote_addr; 462 unsigned int op_write:1; 463 unsigned int op_fence:1; 464 unsigned int op_notify:1; 465 unsigned int op_recverr:1; 466 unsigned int op_mapped:1; 467 unsigned int op_silent:1; 468 unsigned int op_active:1; 469 unsigned int op_bytes; 470 unsigned int op_nents; 471 unsigned int op_count; 472 struct scatterlist *op_sg; 473 struct rds_notifier *op_notifier; 474 475 struct rds_mr *op_rdma_mr; 476 } rdma; 477 struct rm_data_op { 478 unsigned int op_active:1; 479 unsigned int op_notify:1; 480 unsigned int op_nents; 481 unsigned int op_count; 482 unsigned int op_dmasg; 483 unsigned int op_dmaoff; 484 struct rds_znotifier *op_mmp_znotifier; 485 struct scatterlist *op_sg; 486 } data; 487 }; 488 489 struct rds_conn_path *m_conn_path; 490 }; 491 492 /* 493 * The RDS notifier is used (optionally) to tell the application about 494 * completed RDMA operations. Rather than keeping the whole rds message 495 * around on the queue, we allocate a small notifier that is put on the 496 * socket's notifier_list. Notifications are delivered to the application 497 * through control messages. 498 */ 499 struct rds_notifier { 500 struct list_head n_list; 501 uint64_t n_user_token; 502 int n_status; 503 }; 504 505 /* Available as part of RDS core, so doesn't need to participate 506 * in get_preferred transport etc 507 */ 508 #define RDS_TRANS_LOOP 3 509 510 /** 511 * struct rds_transport - transport specific behavioural hooks 512 * 513 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 514 * part of a message. The caller serializes on the send_sem so this 515 * doesn't need to be reentrant for a given conn. The header must be 516 * sent before the data payload. .xmit must be prepared to send a 517 * message with no data payload. .xmit should return the number of 518 * bytes that were sent down the connection, including header bytes. 519 * Returning 0 tells the caller that it doesn't need to perform any 520 * additional work now. This is usually the case when the transport has 521 * filled the sending queue for its connection and will handle 522 * triggering the rds thread to continue the send when space becomes 523 * available. Returning -EAGAIN tells the caller to retry the send 524 * immediately. Returning -ENOMEM tells the caller to retry the send at 525 * some point in the future. 526 * 527 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 528 * it returns the connection can not call rds_recv_incoming(). 529 * This will only be called once after conn_connect returns 530 * non-zero success and will The caller serializes this with 531 * the send and connecting paths (xmit_* and conn_*). The 532 * transport is responsible for other serialization, including 533 * rds_recv_incoming(). This is called in process context but 534 * should try hard not to block. 535 */ 536 537 struct rds_transport { 538 char t_name[TRANSNAMSIZ]; 539 struct list_head t_item; 540 struct module *t_owner; 541 unsigned int t_prefer_loopback:1, 542 t_mp_capable:1; 543 unsigned int t_type; 544 545 int (*laddr_check)(struct net *net, const struct in6_addr *addr, 546 __u32 scope_id); 547 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 548 void (*conn_free)(void *data); 549 int (*conn_path_connect)(struct rds_conn_path *cp); 550 void (*conn_path_shutdown)(struct rds_conn_path *conn); 551 void (*xmit_path_prepare)(struct rds_conn_path *cp); 552 void (*xmit_path_complete)(struct rds_conn_path *cp); 553 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 554 unsigned int hdr_off, unsigned int sg, unsigned int off); 555 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 556 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 557 int (*recv_path)(struct rds_conn_path *cp); 558 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 559 void (*inc_free)(struct rds_incoming *inc); 560 561 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 562 struct rdma_cm_event *event, bool isv6); 563 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id, bool isv6); 564 void (*cm_connect_complete)(struct rds_connection *conn, 565 struct rdma_cm_event *event); 566 567 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 568 unsigned int avail); 569 void (*exit)(void); 570 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 571 struct rds_sock *rs, u32 *key_ret, 572 struct rds_connection *conn); 573 void (*sync_mr)(void *trans_private, int direction); 574 void (*free_mr)(void *trans_private, int invalidate); 575 void (*flush_mrs)(void); 576 bool (*t_unloading)(struct rds_connection *conn); 577 u8 (*get_tos_map)(u8 tos); 578 }; 579 580 /* Bind hash table key length. It is the sum of the size of a struct 581 * in6_addr, a scope_id and a port. 582 */ 583 #define RDS_BOUND_KEY_LEN \ 584 (sizeof(struct in6_addr) + sizeof(__u32) + sizeof(__be16)) 585 586 struct rds_sock { 587 struct sock rs_sk; 588 589 u64 rs_user_addr; 590 u64 rs_user_bytes; 591 592 /* 593 * bound_addr used for both incoming and outgoing, no INADDR_ANY 594 * support. 595 */ 596 struct rhash_head rs_bound_node; 597 u8 rs_bound_key[RDS_BOUND_KEY_LEN]; 598 struct sockaddr_in6 rs_bound_sin6; 599 #define rs_bound_addr rs_bound_sin6.sin6_addr 600 #define rs_bound_addr_v4 rs_bound_sin6.sin6_addr.s6_addr32[3] 601 #define rs_bound_port rs_bound_sin6.sin6_port 602 #define rs_bound_scope_id rs_bound_sin6.sin6_scope_id 603 struct in6_addr rs_conn_addr; 604 #define rs_conn_addr_v4 rs_conn_addr.s6_addr32[3] 605 __be16 rs_conn_port; 606 struct rds_transport *rs_transport; 607 608 /* 609 * rds_sendmsg caches the conn it used the last time around. 610 * This helps avoid costly lookups. 611 */ 612 struct rds_connection *rs_conn; 613 614 /* flag indicating we were congested or not */ 615 int rs_congested; 616 /* seen congestion (ENOBUFS) when sending? */ 617 int rs_seen_congestion; 618 619 /* rs_lock protects all these adjacent members before the newline */ 620 spinlock_t rs_lock; 621 struct list_head rs_send_queue; 622 u32 rs_snd_bytes; 623 int rs_rcv_bytes; 624 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 625 626 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 627 * to decide whether the application should be woken up. 628 * If not set, we use rs_cong_track to find out whether a cong map 629 * update arrived. 630 */ 631 uint64_t rs_cong_mask; 632 uint64_t rs_cong_notify; 633 struct list_head rs_cong_list; 634 unsigned long rs_cong_track; 635 636 /* 637 * rs_recv_lock protects the receive queue, and is 638 * used to serialize with rds_release. 639 */ 640 rwlock_t rs_recv_lock; 641 struct list_head rs_recv_queue; 642 643 /* just for stats reporting */ 644 struct list_head rs_item; 645 646 /* these have their own lock */ 647 spinlock_t rs_rdma_lock; 648 struct rb_root rs_rdma_keys; 649 650 /* Socket options - in case there will be more */ 651 unsigned char rs_recverr, 652 rs_cong_monitor; 653 u32 rs_hash_initval; 654 655 /* Socket receive path trace points*/ 656 u8 rs_rx_traces; 657 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 658 struct rds_msg_zcopy_queue rs_zcookie_queue; 659 u8 rs_tos; 660 }; 661 662 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 663 { 664 return container_of(sk, struct rds_sock, rs_sk); 665 } 666 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 667 { 668 return &rs->rs_sk; 669 } 670 671 /* 672 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 673 * to account for overhead. We don't account for overhead, we just apply 674 * the number of payload bytes to the specified value. 675 */ 676 static inline int rds_sk_sndbuf(struct rds_sock *rs) 677 { 678 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 679 } 680 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 681 { 682 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 683 } 684 685 struct rds_statistics { 686 uint64_t s_conn_reset; 687 uint64_t s_recv_drop_bad_checksum; 688 uint64_t s_recv_drop_old_seq; 689 uint64_t s_recv_drop_no_sock; 690 uint64_t s_recv_drop_dead_sock; 691 uint64_t s_recv_deliver_raced; 692 uint64_t s_recv_delivered; 693 uint64_t s_recv_queued; 694 uint64_t s_recv_immediate_retry; 695 uint64_t s_recv_delayed_retry; 696 uint64_t s_recv_ack_required; 697 uint64_t s_recv_rdma_bytes; 698 uint64_t s_recv_ping; 699 uint64_t s_send_queue_empty; 700 uint64_t s_send_queue_full; 701 uint64_t s_send_lock_contention; 702 uint64_t s_send_lock_queue_raced; 703 uint64_t s_send_immediate_retry; 704 uint64_t s_send_delayed_retry; 705 uint64_t s_send_drop_acked; 706 uint64_t s_send_ack_required; 707 uint64_t s_send_queued; 708 uint64_t s_send_rdma; 709 uint64_t s_send_rdma_bytes; 710 uint64_t s_send_pong; 711 uint64_t s_page_remainder_hit; 712 uint64_t s_page_remainder_miss; 713 uint64_t s_copy_to_user; 714 uint64_t s_copy_from_user; 715 uint64_t s_cong_update_queued; 716 uint64_t s_cong_update_received; 717 uint64_t s_cong_send_error; 718 uint64_t s_cong_send_blocked; 719 uint64_t s_recv_bytes_added_to_socket; 720 uint64_t s_recv_bytes_removed_from_socket; 721 722 }; 723 724 /* af_rds.c */ 725 void rds_sock_addref(struct rds_sock *rs); 726 void rds_sock_put(struct rds_sock *rs); 727 void rds_wake_sk_sleep(struct rds_sock *rs); 728 static inline void __rds_wake_sk_sleep(struct sock *sk) 729 { 730 wait_queue_head_t *waitq = sk_sleep(sk); 731 732 if (!sock_flag(sk, SOCK_DEAD) && waitq) 733 wake_up(waitq); 734 } 735 extern wait_queue_head_t rds_poll_waitq; 736 737 738 /* bind.c */ 739 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 740 void rds_remove_bound(struct rds_sock *rs); 741 struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port, 742 __u32 scope_id); 743 int rds_bind_lock_init(void); 744 void rds_bind_lock_destroy(void); 745 746 /* cong.c */ 747 int rds_cong_get_maps(struct rds_connection *conn); 748 void rds_cong_add_conn(struct rds_connection *conn); 749 void rds_cong_remove_conn(struct rds_connection *conn); 750 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 751 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 752 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 753 void rds_cong_queue_updates(struct rds_cong_map *map); 754 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 755 int rds_cong_updated_since(unsigned long *recent); 756 void rds_cong_add_socket(struct rds_sock *); 757 void rds_cong_remove_socket(struct rds_sock *); 758 void rds_cong_exit(void); 759 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 760 761 /* connection.c */ 762 extern u32 rds_gen_num; 763 int rds_conn_init(void); 764 void rds_conn_exit(void); 765 struct rds_connection *rds_conn_create(struct net *net, 766 const struct in6_addr *laddr, 767 const struct in6_addr *faddr, 768 struct rds_transport *trans, 769 u8 tos, gfp_t gfp, 770 int dev_if); 771 struct rds_connection *rds_conn_create_outgoing(struct net *net, 772 const struct in6_addr *laddr, 773 const struct in6_addr *faddr, 774 struct rds_transport *trans, 775 u8 tos, gfp_t gfp, int dev_if); 776 void rds_conn_shutdown(struct rds_conn_path *cpath); 777 void rds_conn_destroy(struct rds_connection *conn); 778 void rds_conn_drop(struct rds_connection *conn); 779 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy); 780 void rds_conn_connect_if_down(struct rds_connection *conn); 781 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 782 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 783 struct rds_info_iterator *iter, 784 struct rds_info_lengths *lens, 785 int (*visitor)(struct rds_connection *, void *), 786 u64 *buffer, 787 size_t item_len); 788 789 __printf(2, 3) 790 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 791 #define rds_conn_path_error(cp, fmt...) \ 792 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 793 794 static inline int 795 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 796 { 797 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 798 } 799 800 static inline int 801 rds_conn_transition(struct rds_connection *conn, int old, int new) 802 { 803 WARN_ON(conn->c_trans->t_mp_capable); 804 return rds_conn_path_transition(&conn->c_path[0], old, new); 805 } 806 807 static inline int 808 rds_conn_path_state(struct rds_conn_path *cp) 809 { 810 return atomic_read(&cp->cp_state); 811 } 812 813 static inline int 814 rds_conn_state(struct rds_connection *conn) 815 { 816 WARN_ON(conn->c_trans->t_mp_capable); 817 return rds_conn_path_state(&conn->c_path[0]); 818 } 819 820 static inline int 821 rds_conn_path_up(struct rds_conn_path *cp) 822 { 823 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 824 } 825 826 static inline int 827 rds_conn_up(struct rds_connection *conn) 828 { 829 WARN_ON(conn->c_trans->t_mp_capable); 830 return rds_conn_path_up(&conn->c_path[0]); 831 } 832 833 static inline int 834 rds_conn_path_connecting(struct rds_conn_path *cp) 835 { 836 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 837 } 838 839 static inline int 840 rds_conn_connecting(struct rds_connection *conn) 841 { 842 WARN_ON(conn->c_trans->t_mp_capable); 843 return rds_conn_path_connecting(&conn->c_path[0]); 844 } 845 846 /* message.c */ 847 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 848 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents, 849 int *ret); 850 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, 851 bool zcopy); 852 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 853 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 854 __be16 dport, u64 seq); 855 int rds_message_add_extension(struct rds_header *hdr, 856 unsigned int type, const void *data, unsigned int len); 857 int rds_message_next_extension(struct rds_header *hdr, 858 unsigned int *pos, void *buf, unsigned int *buflen); 859 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 860 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 861 void rds_message_inc_free(struct rds_incoming *inc); 862 void rds_message_addref(struct rds_message *rm); 863 void rds_message_put(struct rds_message *rm); 864 void rds_message_wait(struct rds_message *rm); 865 void rds_message_unmapped(struct rds_message *rm); 866 void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info); 867 868 static inline void rds_message_make_checksum(struct rds_header *hdr) 869 { 870 hdr->h_csum = 0; 871 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 872 } 873 874 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 875 { 876 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 877 } 878 879 880 /* page.c */ 881 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 882 gfp_t gfp); 883 void rds_page_exit(void); 884 885 /* recv.c */ 886 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 887 struct in6_addr *saddr); 888 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 889 struct in6_addr *saddr); 890 void rds_inc_put(struct rds_incoming *inc); 891 void rds_recv_incoming(struct rds_connection *conn, struct in6_addr *saddr, 892 struct in6_addr *daddr, 893 struct rds_incoming *inc, gfp_t gfp); 894 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 895 int msg_flags); 896 void rds_clear_recv_queue(struct rds_sock *rs); 897 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 898 void rds_inc_info_copy(struct rds_incoming *inc, 899 struct rds_info_iterator *iter, 900 __be32 saddr, __be32 daddr, int flip); 901 void rds6_inc_info_copy(struct rds_incoming *inc, 902 struct rds_info_iterator *iter, 903 struct in6_addr *saddr, struct in6_addr *daddr, 904 int flip); 905 906 /* send.c */ 907 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 908 void rds_send_path_reset(struct rds_conn_path *conn); 909 int rds_send_xmit(struct rds_conn_path *cp); 910 struct sockaddr_in; 911 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in6 *dest); 912 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 913 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 914 is_acked_func is_acked); 915 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 916 is_acked_func is_acked); 917 void rds_send_ping(struct rds_connection *conn, int cp_index); 918 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 919 920 /* rdma.c */ 921 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 922 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 923 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 924 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 925 void rds_rdma_drop_keys(struct rds_sock *rs); 926 int rds_rdma_extra_size(struct rds_rdma_args *args, 927 struct rds_iov_vector *iov); 928 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 929 struct cmsghdr *cmsg); 930 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 931 struct cmsghdr *cmsg, 932 struct rds_iov_vector *vec); 933 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 934 struct cmsghdr *cmsg); 935 void rds_rdma_free_op(struct rm_rdma_op *ro); 936 void rds_atomic_free_op(struct rm_atomic_op *ao); 937 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 938 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 939 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 940 struct cmsghdr *cmsg); 941 942 void __rds_put_mr_final(struct rds_mr *mr); 943 static inline void rds_mr_put(struct rds_mr *mr) 944 { 945 if (refcount_dec_and_test(&mr->r_refcount)) 946 __rds_put_mr_final(mr); 947 } 948 949 static inline bool rds_destroy_pending(struct rds_connection *conn) 950 { 951 return !check_net(rds_conn_net(conn)) || 952 (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn)); 953 } 954 955 /* stats.c */ 956 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 957 #define rds_stats_inc_which(which, member) do { \ 958 per_cpu(which, get_cpu()).member++; \ 959 put_cpu(); \ 960 } while (0) 961 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 962 #define rds_stats_add_which(which, member, count) do { \ 963 per_cpu(which, get_cpu()).member += count; \ 964 put_cpu(); \ 965 } while (0) 966 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 967 int rds_stats_init(void); 968 void rds_stats_exit(void); 969 void rds_stats_info_copy(struct rds_info_iterator *iter, 970 uint64_t *values, const char *const *names, 971 size_t nr); 972 973 /* sysctl.c */ 974 int rds_sysctl_init(void); 975 void rds_sysctl_exit(void); 976 extern unsigned long rds_sysctl_sndbuf_min; 977 extern unsigned long rds_sysctl_sndbuf_default; 978 extern unsigned long rds_sysctl_sndbuf_max; 979 extern unsigned long rds_sysctl_reconnect_min_jiffies; 980 extern unsigned long rds_sysctl_reconnect_max_jiffies; 981 extern unsigned int rds_sysctl_max_unacked_packets; 982 extern unsigned int rds_sysctl_max_unacked_bytes; 983 extern unsigned int rds_sysctl_ping_enable; 984 extern unsigned long rds_sysctl_trace_flags; 985 extern unsigned int rds_sysctl_trace_level; 986 987 /* threads.c */ 988 int rds_threads_init(void); 989 void rds_threads_exit(void); 990 extern struct workqueue_struct *rds_wq; 991 void rds_queue_reconnect(struct rds_conn_path *cp); 992 void rds_connect_worker(struct work_struct *); 993 void rds_shutdown_worker(struct work_struct *); 994 void rds_send_worker(struct work_struct *); 995 void rds_recv_worker(struct work_struct *); 996 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 997 void rds_connect_complete(struct rds_connection *conn); 998 int rds_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2); 999 1000 /* transport.c */ 1001 void rds_trans_register(struct rds_transport *trans); 1002 void rds_trans_unregister(struct rds_transport *trans); 1003 struct rds_transport *rds_trans_get_preferred(struct net *net, 1004 const struct in6_addr *addr, 1005 __u32 scope_id); 1006 void rds_trans_put(struct rds_transport *trans); 1007 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 1008 unsigned int avail); 1009 struct rds_transport *rds_trans_get(int t_type); 1010 int rds_trans_init(void); 1011 void rds_trans_exit(void); 1012 1013 #endif 1014