net/rds/rds.h

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