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