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 /* The following values are whitelisted for usercopy */ 275 struct rds_inc_usercopy { 276 rds_rdma_cookie_t rdma_cookie; 277 ktime_t rx_tstamp; 278 }; 279 280 struct rds_incoming { 281 refcount_t i_refcount; 282 struct list_head i_item; 283 struct rds_connection *i_conn; 284 struct rds_conn_path *i_conn_path; 285 struct rds_header i_hdr; 286 unsigned long i_rx_jiffies; 287 struct in6_addr i_saddr; 288 289 struct rds_inc_usercopy i_usercopy; 290 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; 291 }; 292 293 struct rds_mr { 294 struct rb_node r_rb_node; 295 refcount_t r_refcount; 296 u32 r_key; 297 298 /* A copy of the creation flags */ 299 unsigned int r_use_once:1; 300 unsigned int r_invalidate:1; 301 unsigned int r_write:1; 302 303 /* This is for RDS_MR_DEAD. 304 * It would be nice & consistent to make this part of the above 305 * bit field here, but we need to use test_and_set_bit. 306 */ 307 unsigned long r_state; 308 struct rds_sock *r_sock; /* back pointer to the socket that owns us */ 309 struct rds_transport *r_trans; 310 void *r_trans_private; 311 }; 312 313 /* Flags for mr->r_state */ 314 #define RDS_MR_DEAD 0 315 316 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) 317 { 318 return r_key | (((u64) offset) << 32); 319 } 320 321 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) 322 { 323 return cookie; 324 } 325 326 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) 327 { 328 return cookie >> 32; 329 } 330 331 /* atomic operation types */ 332 #define RDS_ATOMIC_TYPE_CSWP 0 333 #define RDS_ATOMIC_TYPE_FADD 1 334 335 /* 336 * m_sock_item and m_conn_item are on lists that are serialized under 337 * conn->c_lock. m_sock_item has additional meaning in that once it is empty 338 * the message will not be put back on the retransmit list after being sent. 339 * messages that are canceled while being sent rely on this. 340 * 341 * m_inc is used by loopback so that it can pass an incoming message straight 342 * back up into the rx path. It embeds a wire header which is also used by 343 * the send path, which is kind of awkward. 344 * 345 * m_sock_item indicates the message's presence on a socket's send or receive 346 * queue. m_rs will point to that socket. 347 * 348 * m_daddr is used by cancellation to prune messages to a given destination. 349 * 350 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock 351 * nesting. As paths iterate over messages on a sock, or conn, they must 352 * also lock the conn, or sock, to remove the message from those lists too. 353 * Testing the flag to determine if the message is still on the lists lets 354 * us avoid testing the list_head directly. That means each path can use 355 * the message's list_head to keep it on a local list while juggling locks 356 * without confusing the other path. 357 * 358 * m_ack_seq is an optional field set by transports who need a different 359 * sequence number range to invalidate. They can use this in a callback 360 * that they pass to rds_send_drop_acked() to see if each message has been 361 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't 362 * had ack_seq set yet. 363 */ 364 #define RDS_MSG_ON_SOCK 1 365 #define RDS_MSG_ON_CONN 2 366 #define RDS_MSG_HAS_ACK_SEQ 3 367 #define RDS_MSG_ACK_REQUIRED 4 368 #define RDS_MSG_RETRANSMITTED 5 369 #define RDS_MSG_MAPPED 6 370 #define RDS_MSG_PAGEVEC 7 371 #define RDS_MSG_FLUSH 8 372 373 struct rds_znotifier { 374 struct mmpin z_mmp; 375 u32 z_cookie; 376 }; 377 378 struct rds_msg_zcopy_info { 379 struct list_head rs_zcookie_next; 380 union { 381 struct rds_znotifier znotif; 382 struct rds_zcopy_cookies zcookies; 383 }; 384 }; 385 386 struct rds_msg_zcopy_queue { 387 struct list_head zcookie_head; 388 spinlock_t lock; /* protects zcookie_head queue */ 389 }; 390 391 static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q) 392 { 393 spin_lock_init(&q->lock); 394 INIT_LIST_HEAD(&q->zcookie_head); 395 } 396 397 struct rds_iov_vector { 398 struct rds_iovec *iov; 399 int len; 400 }; 401 402 struct rds_iov_vector_arr { 403 struct rds_iov_vector *vec; 404 int len; 405 int indx; 406 int incr; 407 }; 408 409 struct rds_message { 410 refcount_t m_refcount; 411 struct list_head m_sock_item; 412 struct list_head m_conn_item; 413 struct rds_incoming m_inc; 414 u64 m_ack_seq; 415 struct in6_addr m_daddr; 416 unsigned long m_flags; 417 418 /* Never access m_rs without holding m_rs_lock. 419 * Lock nesting is 420 * rm->m_rs_lock 421 * -> rs->rs_lock 422 */ 423 spinlock_t m_rs_lock; 424 wait_queue_head_t m_flush_wait; 425 426 struct rds_sock *m_rs; 427 428 /* cookie to send to remote, in rds header */ 429 rds_rdma_cookie_t m_rdma_cookie; 430 431 unsigned int m_used_sgs; 432 unsigned int m_total_sgs; 433 434 void *m_final_op; 435 436 struct { 437 struct rm_atomic_op { 438 int op_type; 439 union { 440 struct { 441 uint64_t compare; 442 uint64_t swap; 443 uint64_t compare_mask; 444 uint64_t swap_mask; 445 } op_m_cswp; 446 struct { 447 uint64_t add; 448 uint64_t nocarry_mask; 449 } op_m_fadd; 450 }; 451 452 u32 op_rkey; 453 u64 op_remote_addr; 454 unsigned int op_notify:1; 455 unsigned int op_recverr:1; 456 unsigned int op_mapped:1; 457 unsigned int op_silent:1; 458 unsigned int op_active:1; 459 struct scatterlist *op_sg; 460 struct rds_notifier *op_notifier; 461 462 struct rds_mr *op_rdma_mr; 463 } atomic; 464 struct rm_rdma_op { 465 u32 op_rkey; 466 u64 op_remote_addr; 467 unsigned int op_write:1; 468 unsigned int op_fence:1; 469 unsigned int op_notify:1; 470 unsigned int op_recverr:1; 471 unsigned int op_mapped:1; 472 unsigned int op_silent:1; 473 unsigned int op_active:1; 474 unsigned int op_bytes; 475 unsigned int op_nents; 476 unsigned int op_count; 477 struct scatterlist *op_sg; 478 struct rds_notifier *op_notifier; 479 480 struct rds_mr *op_rdma_mr; 481 } rdma; 482 struct rm_data_op { 483 unsigned int op_active:1; 484 unsigned int op_nents; 485 unsigned int op_count; 486 unsigned int op_dmasg; 487 unsigned int op_dmaoff; 488 struct rds_znotifier *op_mmp_znotifier; 489 struct scatterlist *op_sg; 490 } data; 491 }; 492 493 struct rds_conn_path *m_conn_path; 494 }; 495 496 /* 497 * The RDS notifier is used (optionally) to tell the application about 498 * completed RDMA operations. Rather than keeping the whole rds message 499 * around on the queue, we allocate a small notifier that is put on the 500 * socket's notifier_list. Notifications are delivered to the application 501 * through control messages. 502 */ 503 struct rds_notifier { 504 struct list_head n_list; 505 uint64_t n_user_token; 506 int n_status; 507 }; 508 509 /* Available as part of RDS core, so doesn't need to participate 510 * in get_preferred transport etc 511 */ 512 #define RDS_TRANS_LOOP 3 513 514 /** 515 * struct rds_transport - transport specific behavioural hooks 516 * 517 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send 518 * part of a message. The caller serializes on the send_sem so this 519 * doesn't need to be reentrant for a given conn. The header must be 520 * sent before the data payload. .xmit must be prepared to send a 521 * message with no data payload. .xmit should return the number of 522 * bytes that were sent down the connection, including header bytes. 523 * Returning 0 tells the caller that it doesn't need to perform any 524 * additional work now. This is usually the case when the transport has 525 * filled the sending queue for its connection and will handle 526 * triggering the rds thread to continue the send when space becomes 527 * available. Returning -EAGAIN tells the caller to retry the send 528 * immediately. Returning -ENOMEM tells the caller to retry the send at 529 * some point in the future. 530 * 531 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once 532 * it returns the connection can not call rds_recv_incoming(). 533 * This will only be called once after conn_connect returns 534 * non-zero success and will The caller serializes this with 535 * the send and connecting paths (xmit_* and conn_*). The 536 * transport is responsible for other serialization, including 537 * rds_recv_incoming(). This is called in process context but 538 * should try hard not to block. 539 */ 540 541 struct rds_transport { 542 char t_name[TRANSNAMSIZ]; 543 struct list_head t_item; 544 struct module *t_owner; 545 unsigned int t_prefer_loopback:1, 546 t_mp_capable:1; 547 unsigned int t_type; 548 549 int (*laddr_check)(struct net *net, const struct in6_addr *addr, 550 __u32 scope_id); 551 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); 552 void (*conn_free)(void *data); 553 int (*conn_path_connect)(struct rds_conn_path *cp); 554 void (*conn_path_shutdown)(struct rds_conn_path *conn); 555 void (*xmit_path_prepare)(struct rds_conn_path *cp); 556 void (*xmit_path_complete)(struct rds_conn_path *cp); 557 int (*xmit)(struct rds_connection *conn, struct rds_message *rm, 558 unsigned int hdr_off, unsigned int sg, unsigned int off); 559 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); 560 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); 561 int (*recv_path)(struct rds_conn_path *cp); 562 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); 563 void (*inc_free)(struct rds_incoming *inc); 564 565 int (*cm_handle_connect)(struct rdma_cm_id *cm_id, 566 struct rdma_cm_event *event, bool isv6); 567 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id, bool isv6); 568 void (*cm_connect_complete)(struct rds_connection *conn, 569 struct rdma_cm_event *event); 570 571 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, 572 unsigned int avail); 573 void (*exit)(void); 574 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, 575 struct rds_sock *rs, u32 *key_ret, 576 struct rds_connection *conn); 577 void (*sync_mr)(void *trans_private, int direction); 578 void (*free_mr)(void *trans_private, int invalidate); 579 void (*flush_mrs)(void); 580 bool (*t_unloading)(struct rds_connection *conn); 581 u8 (*get_tos_map)(u8 tos); 582 }; 583 584 /* Bind hash table key length. It is the sum of the size of a struct 585 * in6_addr, a scope_id and a port. 586 */ 587 #define RDS_BOUND_KEY_LEN \ 588 (sizeof(struct in6_addr) + sizeof(__u32) + sizeof(__be16)) 589 590 struct rds_sock { 591 struct sock rs_sk; 592 593 u64 rs_user_addr; 594 u64 rs_user_bytes; 595 596 /* 597 * bound_addr used for both incoming and outgoing, no INADDR_ANY 598 * support. 599 */ 600 struct rhash_head rs_bound_node; 601 u8 rs_bound_key[RDS_BOUND_KEY_LEN]; 602 struct sockaddr_in6 rs_bound_sin6; 603 #define rs_bound_addr rs_bound_sin6.sin6_addr 604 #define rs_bound_addr_v4 rs_bound_sin6.sin6_addr.s6_addr32[3] 605 #define rs_bound_port rs_bound_sin6.sin6_port 606 #define rs_bound_scope_id rs_bound_sin6.sin6_scope_id 607 struct in6_addr rs_conn_addr; 608 #define rs_conn_addr_v4 rs_conn_addr.s6_addr32[3] 609 __be16 rs_conn_port; 610 struct rds_transport *rs_transport; 611 612 /* 613 * rds_sendmsg caches the conn it used the last time around. 614 * This helps avoid costly lookups. 615 */ 616 struct rds_connection *rs_conn; 617 618 /* flag indicating we were congested or not */ 619 int rs_congested; 620 /* seen congestion (ENOBUFS) when sending? */ 621 int rs_seen_congestion; 622 623 /* rs_lock protects all these adjacent members before the newline */ 624 spinlock_t rs_lock; 625 struct list_head rs_send_queue; 626 u32 rs_snd_bytes; 627 int rs_rcv_bytes; 628 struct list_head rs_notify_queue; /* currently used for failed RDMAs */ 629 630 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask 631 * to decide whether the application should be woken up. 632 * If not set, we use rs_cong_track to find out whether a cong map 633 * update arrived. 634 */ 635 uint64_t rs_cong_mask; 636 uint64_t rs_cong_notify; 637 struct list_head rs_cong_list; 638 unsigned long rs_cong_track; 639 640 /* 641 * rs_recv_lock protects the receive queue, and is 642 * used to serialize with rds_release. 643 */ 644 rwlock_t rs_recv_lock; 645 struct list_head rs_recv_queue; 646 647 /* just for stats reporting */ 648 struct list_head rs_item; 649 650 /* these have their own lock */ 651 spinlock_t rs_rdma_lock; 652 struct rb_root rs_rdma_keys; 653 654 /* Socket options - in case there will be more */ 655 unsigned char rs_recverr, 656 rs_cong_monitor; 657 u32 rs_hash_initval; 658 659 /* Socket receive path trace points*/ 660 u8 rs_rx_traces; 661 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; 662 struct rds_msg_zcopy_queue rs_zcookie_queue; 663 u8 rs_tos; 664 }; 665 666 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) 667 { 668 return container_of(sk, struct rds_sock, rs_sk); 669 } 670 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) 671 { 672 return &rs->rs_sk; 673 } 674 675 /* 676 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value 677 * to account for overhead. We don't account for overhead, we just apply 678 * the number of payload bytes to the specified value. 679 */ 680 static inline int rds_sk_sndbuf(struct rds_sock *rs) 681 { 682 return rds_rs_to_sk(rs)->sk_sndbuf / 2; 683 } 684 static inline int rds_sk_rcvbuf(struct rds_sock *rs) 685 { 686 return rds_rs_to_sk(rs)->sk_rcvbuf / 2; 687 } 688 689 struct rds_statistics { 690 uint64_t s_conn_reset; 691 uint64_t s_recv_drop_bad_checksum; 692 uint64_t s_recv_drop_old_seq; 693 uint64_t s_recv_drop_no_sock; 694 uint64_t s_recv_drop_dead_sock; 695 uint64_t s_recv_deliver_raced; 696 uint64_t s_recv_delivered; 697 uint64_t s_recv_queued; 698 uint64_t s_recv_immediate_retry; 699 uint64_t s_recv_delayed_retry; 700 uint64_t s_recv_ack_required; 701 uint64_t s_recv_rdma_bytes; 702 uint64_t s_recv_ping; 703 uint64_t s_send_queue_empty; 704 uint64_t s_send_queue_full; 705 uint64_t s_send_lock_contention; 706 uint64_t s_send_lock_queue_raced; 707 uint64_t s_send_immediate_retry; 708 uint64_t s_send_delayed_retry; 709 uint64_t s_send_drop_acked; 710 uint64_t s_send_ack_required; 711 uint64_t s_send_queued; 712 uint64_t s_send_rdma; 713 uint64_t s_send_rdma_bytes; 714 uint64_t s_send_pong; 715 uint64_t s_page_remainder_hit; 716 uint64_t s_page_remainder_miss; 717 uint64_t s_copy_to_user; 718 uint64_t s_copy_from_user; 719 uint64_t s_cong_update_queued; 720 uint64_t s_cong_update_received; 721 uint64_t s_cong_send_error; 722 uint64_t s_cong_send_blocked; 723 uint64_t s_recv_bytes_added_to_socket; 724 uint64_t s_recv_bytes_removed_from_socket; 725 uint64_t s_send_stuck_rm; 726 }; 727 728 /* af_rds.c */ 729 void rds_sock_addref(struct rds_sock *rs); 730 void rds_sock_put(struct rds_sock *rs); 731 void rds_wake_sk_sleep(struct rds_sock *rs); 732 static inline void __rds_wake_sk_sleep(struct sock *sk) 733 { 734 wait_queue_head_t *waitq = sk_sleep(sk); 735 736 if (!sock_flag(sk, SOCK_DEAD) && waitq) 737 wake_up(waitq); 738 } 739 extern wait_queue_head_t rds_poll_waitq; 740 741 742 /* bind.c */ 743 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); 744 void rds_remove_bound(struct rds_sock *rs); 745 struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port, 746 __u32 scope_id); 747 int rds_bind_lock_init(void); 748 void rds_bind_lock_destroy(void); 749 750 /* cong.c */ 751 int rds_cong_get_maps(struct rds_connection *conn); 752 void rds_cong_add_conn(struct rds_connection *conn); 753 void rds_cong_remove_conn(struct rds_connection *conn); 754 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); 755 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); 756 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); 757 void rds_cong_queue_updates(struct rds_cong_map *map); 758 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); 759 int rds_cong_updated_since(unsigned long *recent); 760 void rds_cong_add_socket(struct rds_sock *); 761 void rds_cong_remove_socket(struct rds_sock *); 762 void rds_cong_exit(void); 763 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); 764 765 /* connection.c */ 766 extern u32 rds_gen_num; 767 int rds_conn_init(void); 768 void rds_conn_exit(void); 769 struct rds_connection *rds_conn_create(struct net *net, 770 const struct in6_addr *laddr, 771 const struct in6_addr *faddr, 772 struct rds_transport *trans, 773 u8 tos, gfp_t gfp, 774 int dev_if); 775 struct rds_connection *rds_conn_create_outgoing(struct net *net, 776 const struct in6_addr *laddr, 777 const struct in6_addr *faddr, 778 struct rds_transport *trans, 779 u8 tos, gfp_t gfp, int dev_if); 780 void rds_conn_shutdown(struct rds_conn_path *cpath); 781 void rds_conn_destroy(struct rds_connection *conn); 782 void rds_conn_drop(struct rds_connection *conn); 783 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy); 784 void rds_conn_connect_if_down(struct rds_connection *conn); 785 void rds_conn_path_connect_if_down(struct rds_conn_path *cp); 786 void rds_for_each_conn_info(struct socket *sock, unsigned int len, 787 struct rds_info_iterator *iter, 788 struct rds_info_lengths *lens, 789 int (*visitor)(struct rds_connection *, void *), 790 u64 *buffer, 791 size_t item_len); 792 793 __printf(2, 3) 794 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); 795 #define rds_conn_path_error(cp, fmt...) \ 796 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) 797 798 static inline int 799 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) 800 { 801 return atomic_cmpxchg(&cp->cp_state, old, new) == old; 802 } 803 804 static inline int 805 rds_conn_transition(struct rds_connection *conn, int old, int new) 806 { 807 WARN_ON(conn->c_trans->t_mp_capable); 808 return rds_conn_path_transition(&conn->c_path[0], old, new); 809 } 810 811 static inline int 812 rds_conn_path_state(struct rds_conn_path *cp) 813 { 814 return atomic_read(&cp->cp_state); 815 } 816 817 static inline int 818 rds_conn_state(struct rds_connection *conn) 819 { 820 WARN_ON(conn->c_trans->t_mp_capable); 821 return rds_conn_path_state(&conn->c_path[0]); 822 } 823 824 static inline int 825 rds_conn_path_up(struct rds_conn_path *cp) 826 { 827 return atomic_read(&cp->cp_state) == RDS_CONN_UP; 828 } 829 830 static inline int 831 rds_conn_up(struct rds_connection *conn) 832 { 833 WARN_ON(conn->c_trans->t_mp_capable); 834 return rds_conn_path_up(&conn->c_path[0]); 835 } 836 837 static inline int 838 rds_conn_path_connecting(struct rds_conn_path *cp) 839 { 840 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; 841 } 842 843 static inline int 844 rds_conn_connecting(struct rds_connection *conn) 845 { 846 WARN_ON(conn->c_trans->t_mp_capable); 847 return rds_conn_path_connecting(&conn->c_path[0]); 848 } 849 850 /* message.c */ 851 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); 852 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents, 853 int *ret); 854 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, 855 bool zcopy); 856 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); 857 void rds_message_populate_header(struct rds_header *hdr, __be16 sport, 858 __be16 dport, u64 seq); 859 int rds_message_add_extension(struct rds_header *hdr, 860 unsigned int type, const void *data, unsigned int len); 861 int rds_message_next_extension(struct rds_header *hdr, 862 unsigned int *pos, void *buf, unsigned int *buflen); 863 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); 864 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); 865 void rds_message_inc_free(struct rds_incoming *inc); 866 void rds_message_addref(struct rds_message *rm); 867 void rds_message_put(struct rds_message *rm); 868 void rds_message_wait(struct rds_message *rm); 869 void rds_message_unmapped(struct rds_message *rm); 870 void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info); 871 872 static inline void rds_message_make_checksum(struct rds_header *hdr) 873 { 874 hdr->h_csum = 0; 875 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); 876 } 877 878 static inline int rds_message_verify_checksum(const struct rds_header *hdr) 879 { 880 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; 881 } 882 883 884 /* page.c */ 885 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, 886 gfp_t gfp); 887 void rds_page_exit(void); 888 889 /* recv.c */ 890 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, 891 struct in6_addr *saddr); 892 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, 893 struct in6_addr *saddr); 894 void rds_inc_put(struct rds_incoming *inc); 895 void rds_recv_incoming(struct rds_connection *conn, struct in6_addr *saddr, 896 struct in6_addr *daddr, 897 struct rds_incoming *inc, gfp_t gfp); 898 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 899 int msg_flags); 900 void rds_clear_recv_queue(struct rds_sock *rs); 901 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); 902 void rds_inc_info_copy(struct rds_incoming *inc, 903 struct rds_info_iterator *iter, 904 __be32 saddr, __be32 daddr, int flip); 905 void rds6_inc_info_copy(struct rds_incoming *inc, 906 struct rds_info_iterator *iter, 907 struct in6_addr *saddr, struct in6_addr *daddr, 908 int flip); 909 910 /* send.c */ 911 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); 912 void rds_send_path_reset(struct rds_conn_path *conn); 913 int rds_send_xmit(struct rds_conn_path *cp); 914 struct sockaddr_in; 915 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in6 *dest); 916 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); 917 void rds_send_drop_acked(struct rds_connection *conn, u64 ack, 918 is_acked_func is_acked); 919 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, 920 is_acked_func is_acked); 921 void rds_send_ping(struct rds_connection *conn, int cp_index); 922 int rds_send_pong(struct rds_conn_path *cp, __be16 dport); 923 924 /* rdma.c */ 925 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); 926 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); 927 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); 928 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); 929 void rds_rdma_drop_keys(struct rds_sock *rs); 930 int rds_rdma_extra_size(struct rds_rdma_args *args, 931 struct rds_iov_vector *iov); 932 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, 933 struct cmsghdr *cmsg); 934 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, 935 struct cmsghdr *cmsg, 936 struct rds_iov_vector *vec); 937 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, 938 struct cmsghdr *cmsg); 939 void rds_rdma_free_op(struct rm_rdma_op *ro); 940 void rds_atomic_free_op(struct rm_atomic_op *ao); 941 void rds_rdma_send_complete(struct rds_message *rm, int wc_status); 942 void rds_atomic_send_complete(struct rds_message *rm, int wc_status); 943 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, 944 struct cmsghdr *cmsg); 945 946 void __rds_put_mr_final(struct rds_mr *mr); 947 static inline void rds_mr_put(struct rds_mr *mr) 948 { 949 if (refcount_dec_and_test(&mr->r_refcount)) 950 __rds_put_mr_final(mr); 951 } 952 953 static inline bool rds_destroy_pending(struct rds_connection *conn) 954 { 955 return !check_net(rds_conn_net(conn)) || 956 (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn)); 957 } 958 959 /* stats.c */ 960 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); 961 #define rds_stats_inc_which(which, member) do { \ 962 per_cpu(which, get_cpu()).member++; \ 963 put_cpu(); \ 964 } while (0) 965 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) 966 #define rds_stats_add_which(which, member, count) do { \ 967 per_cpu(which, get_cpu()).member += count; \ 968 put_cpu(); \ 969 } while (0) 970 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) 971 int rds_stats_init(void); 972 void rds_stats_exit(void); 973 void rds_stats_info_copy(struct rds_info_iterator *iter, 974 uint64_t *values, const char *const *names, 975 size_t nr); 976 977 /* sysctl.c */ 978 int rds_sysctl_init(void); 979 void rds_sysctl_exit(void); 980 extern unsigned long rds_sysctl_sndbuf_min; 981 extern unsigned long rds_sysctl_sndbuf_default; 982 extern unsigned long rds_sysctl_sndbuf_max; 983 extern unsigned long rds_sysctl_reconnect_min_jiffies; 984 extern unsigned long rds_sysctl_reconnect_max_jiffies; 985 extern unsigned int rds_sysctl_max_unacked_packets; 986 extern unsigned int rds_sysctl_max_unacked_bytes; 987 extern unsigned int rds_sysctl_ping_enable; 988 extern unsigned long rds_sysctl_trace_flags; 989 extern unsigned int rds_sysctl_trace_level; 990 991 /* threads.c */ 992 int rds_threads_init(void); 993 void rds_threads_exit(void); 994 extern struct workqueue_struct *rds_wq; 995 void rds_queue_reconnect(struct rds_conn_path *cp); 996 void rds_connect_worker(struct work_struct *); 997 void rds_shutdown_worker(struct work_struct *); 998 void rds_send_worker(struct work_struct *); 999 void rds_recv_worker(struct work_struct *); 1000 void rds_connect_path_complete(struct rds_conn_path *conn, int curr); 1001 void rds_connect_complete(struct rds_connection *conn); 1002 int rds_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2); 1003 1004 /* transport.c */ 1005 void rds_trans_register(struct rds_transport *trans); 1006 void rds_trans_unregister(struct rds_transport *trans); 1007 struct rds_transport *rds_trans_get_preferred(struct net *net, 1008 const struct in6_addr *addr, 1009 __u32 scope_id); 1010 void rds_trans_put(struct rds_transport *trans); 1011 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, 1012 unsigned int avail); 1013 struct rds_transport *rds_trans_get(int t_type); 1014 int rds_trans_init(void); 1015 void rds_trans_exit(void); 1016 1017 #endif 1018