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 ATOMIC64_INIT
  32 #define KERNEL_HAS_ATOMIC64
  33 #endif
  34
  35 #ifdef DEBUG
  36 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
  37 #else
  38 /* sigh, pr_debug() causes unused variable warnings */
  39 static inline void __attribute__ ((format (printf, 1, 2)))
  40 rdsdebug(char *fmt, ...)
  41 {
  42 }
  43 #endif
  44
  45 /* XXX is there one of these somewhere? */
  46 #define ceil(x, y) \
  47         ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
  48
  49 #define RDS_FRAG_SHIFT  12
  50 #define RDS_FRAG_SIZE   ((unsigned int)(1 << RDS_FRAG_SHIFT))
  51
  52 #define RDS_CONG_MAP_BYTES      (65536 / 8)
  53 #define RDS_CONG_MAP_LONGS      (RDS_CONG_MAP_BYTES / sizeof(unsigned long))
  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_ERROR,
  78 };
  79
  80 /* Bits for c_flags */
  81 #define RDS_LL_SEND_FULL        0
  82 #define RDS_RECONNECT_PENDING   1
  83
  84 struct rds_connection {
  85         struct hlist_node       c_hash_node;
  86         __be32                  c_laddr;
  87         __be32                  c_faddr;
  88         unsigned int            c_loopback:1;
  89         struct rds_connection   *c_passive;
  90
  91         struct rds_cong_map     *c_lcong;
  92         struct rds_cong_map     *c_fcong;
  93
  94         struct mutex            c_send_lock;    /* protect send ring */
  95         struct rds_message      *c_xmit_rm;
  96         unsigned long           c_xmit_sg;
  97         unsigned int            c_xmit_hdr_off;
  98         unsigned int            c_xmit_data_off;
  99         unsigned int            c_xmit_rdma_sent;
 100
 101         spinlock_t              c_lock;         /* protect msg queues */
 102         u64                     c_next_tx_seq;
 103         struct list_head        c_send_queue;
 104         struct list_head        c_retrans;
 105
 106         u64                     c_next_rx_seq;
 107
 108         struct rds_transport    *c_trans;
 109         void                    *c_transport_data;
 110
 111         atomic_t                c_state;
 112         unsigned long           c_flags;
 113         unsigned long           c_reconnect_jiffies;
 114         struct delayed_work     c_send_w;
 115         struct delayed_work     c_recv_w;
 116         struct delayed_work     c_conn_w;
 117         struct work_struct      c_down_w;
 118         struct mutex            c_cm_lock;      /* protect conn state & cm */
 119
 120         struct list_head        c_map_item;
 121         unsigned long           c_map_queued;
 122         unsigned long           c_map_offset;
 123         unsigned long           c_map_bytes;
 124
 125         unsigned int            c_unacked_packets;
 126         unsigned int            c_unacked_bytes;
 127
 128         /* Protocol version */
 129         unsigned int            c_version;
 130 };
 131
 132 #define RDS_FLAG_CONG_BITMAP    0x01
 133 #define RDS_FLAG_ACK_REQUIRED   0x02
 134 #define RDS_FLAG_RETRANSMITTED  0x04
 135 #define RDS_MAX_ADV_CREDIT      255
 136
 137 /*
 138  * Maximum space available for extension headers.
 139  */
 140 #define RDS_HEADER_EXT_SPACE    16
 141
 142 struct rds_header {
 143         __be64  h_sequence;
 144         __be64  h_ack;
 145         __be32  h_len;
 146         __be16  h_sport;
 147         __be16  h_dport;
 148         u8      h_flags;
 149         u8      h_credit;
 150         u8      h_padding[4];
 151         __sum16 h_csum;
 152
 153         u8      h_exthdr[RDS_HEADER_EXT_SPACE];
 154 };
 155
 156 /*
 157  * Reserved - indicates end of extensions
 158  */
 159 #define RDS_EXTHDR_NONE         0
 160
 161 /*
 162  * This extension header is included in the very
 163  * first message that is sent on a new connection,
 164  * and identifies the protocol level. This will help
 165  * rolling updates if a future change requires breaking
 166  * the protocol.
 167  * NB: This is no longer true for IB, where we do a version
 168  * negotiation during the connection setup phase (protocol
 169  * version information is included in the RDMA CM private data).
 170  */
 171 #define RDS_EXTHDR_VERSION      1
 172 struct rds_ext_header_version {
 173         __be32                  h_version;
 174 };
 175
 176 /*
 177  * This extension header is included in the RDS message
 178  * chasing an RDMA operation.
 179  */
 180 #define RDS_EXTHDR_RDMA         2
 181 struct rds_ext_header_rdma {
 182         __be32                  h_rdma_rkey;
 183 };
 184
 185 /*
 186  * This extension header tells the peer about the
 187  * destination <R_Key,offset> of the requested RDMA
 188  * operation.
 189  */
 190 #define RDS_EXTHDR_RDMA_DEST    3
 191 struct rds_ext_header_rdma_dest {
 192         __be32                  h_rdma_rkey;
 193         __be32                  h_rdma_offset;
 194 };
 195
 196 #define __RDS_EXTHDR_MAX        16 /* for now */
 197
 198 struct rds_incoming {
 199         atomic_t                i_refcount;
 200         struct list_head        i_item;
 201         struct rds_connection   *i_conn;
 202         struct rds_header       i_hdr;
 203         unsigned long           i_rx_jiffies;
 204         __be32                  i_saddr;
 205
 206         rds_rdma_cookie_t       i_rdma_cookie;
 207 };
 208
 209 /*
 210  * m_sock_item and m_conn_item are on lists that are serialized under
 211  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
 212  * the message will not be put back on the retransmit list after being sent.
 213  * messages that are canceled while being sent rely on this.
 214  *
 215  * m_inc is used by loopback so that it can pass an incoming message straight
 216  * back up into the rx path.  It embeds a wire header which is also used by
 217  * the send path, which is kind of awkward.
 218  *
 219  * m_sock_item indicates the message's presence on a socket's send or receive
 220  * queue.  m_rs will point to that socket.
 221  *
 222  * m_daddr is used by cancellation to prune messages to a given destination.
 223  *
 224  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
 225  * nesting.  As paths iterate over messages on a sock, or conn, they must
 226  * also lock the conn, or sock, to remove the message from those lists too.
 227  * Testing the flag to determine if the message is still on the lists lets
 228  * us avoid testing the list_head directly.  That means each path can use
 229  * the message's list_head to keep it on a local list while juggling locks
 230  * without confusing the other path.
 231  *
 232  * m_ack_seq is an optional field set by transports who need a different
 233  * sequence number range to invalidate.  They can use this in a callback
 234  * that they pass to rds_send_drop_acked() to see if each message has been
 235  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
 236  * had ack_seq set yet.
 237  */
 238 #define RDS_MSG_ON_SOCK         1
 239 #define RDS_MSG_ON_CONN         2
 240 #define RDS_MSG_HAS_ACK_SEQ     3
 241 #define RDS_MSG_ACK_REQUIRED    4
 242 #define RDS_MSG_RETRANSMITTED   5
 243 #define RDS_MSG_MAPPED          6
 244 #define RDS_MSG_PAGEVEC         7
 245
 246 struct rds_message {
 247         atomic_t                m_refcount;
 248         struct list_head        m_sock_item;
 249         struct list_head        m_conn_item;
 250         struct rds_incoming     m_inc;
 251         u64                     m_ack_seq;
 252         __be32                  m_daddr;
 253         unsigned long           m_flags;
 254
 255         /* Never access m_rs without holding m_rs_lock.
 256          * Lock nesting is
 257          *  rm->m_rs_lock
 258          *   -> rs->rs_lock
 259          */
 260         spinlock_t              m_rs_lock;
 261         struct rds_sock         *m_rs;
 262         struct rds_rdma_op      *m_rdma_op;
 263         rds_rdma_cookie_t       m_rdma_cookie;
 264         struct rds_mr           *m_rdma_mr;
 265         unsigned int            m_nents;
 266         unsigned int            m_count;
 267         struct scatterlist      m_sg[0];
 268 };
 269
 270 /*
 271  * The RDS notifier is used (optionally) to tell the application about
 272  * completed RDMA operations. Rather than keeping the whole rds message
 273  * around on the queue, we allocate a small notifier that is put on the
 274  * socket's notifier_list. Notifications are delivered to the application
 275  * through control messages.
 276  */
 277 struct rds_notifier {
 278         struct list_head        n_list;
 279         uint64_t                n_user_token;
 280         int                     n_status;
 281 };
 282
 283 /**
 284  * struct rds_transport -  transport specific behavioural hooks
 285  *
 286  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
 287  *        part of a message.  The caller serializes on the send_sem so this
 288  *        doesn't need to be reentrant for a given conn.  The header must be
 289  *        sent before the data payload.  .xmit must be prepared to send a
 290  *        message with no data payload.  .xmit should return the number of
 291  *        bytes that were sent down the connection, including header bytes.
 292  *        Returning 0 tells the caller that it doesn't need to perform any
 293  *        additional work now.  This is usually the case when the transport has
 294  *        filled the sending queue for its connection and will handle
 295  *        triggering the rds thread to continue the send when space becomes
 296  *        available.  Returning -EAGAIN tells the caller to retry the send
 297  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
 298  *        some point in the future.
 299  *
 300  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
 301  *                 it returns the connection can not call rds_recv_incoming().
 302  *                 This will only be called once after conn_connect returns
 303  *                 non-zero success and will The caller serializes this with
 304  *                 the send and connecting paths (xmit_* and conn_*).  The
 305  *                 transport is responsible for other serialization, including
 306  *                 rds_recv_incoming().  This is called in process context but
 307  *                 should try hard not to block.
 308  *
 309  * @xmit_cong_map: This asks the transport to send the local bitmap down the
 310  *                 given connection.  XXX get a better story about the bitmap
 311  *                 flag and header.
 312  */
 313
 314 struct rds_transport {
 315         char                    t_name[TRANSNAMSIZ];
 316         struct list_head        t_item;
 317         struct module           *t_owner;
 318         unsigned int            t_prefer_loopback:1;
 319
 320         int (*laddr_check)(__be32 addr);
 321         int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
 322         void (*conn_free)(void *data);
 323         int (*conn_connect)(struct rds_connection *conn);
 324         void (*conn_shutdown)(struct rds_connection *conn);
 325         void (*xmit_prepare)(struct rds_connection *conn);
 326         void (*xmit_complete)(struct rds_connection *conn);
 327         int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
 328                     unsigned int hdr_off, unsigned int sg, unsigned int off);
 329         int (*xmit_cong_map)(struct rds_connection *conn,
 330                              struct rds_cong_map *map, unsigned long offset);
 331         int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
 332         int (*recv)(struct rds_connection *conn);
 333         int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
 334                                 size_t size);
 335         void (*inc_purge)(struct rds_incoming *inc);
 336         void (*inc_free)(struct rds_incoming *inc);
 337
 338         int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
 339                                  struct rdma_cm_event *event);
 340         int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
 341         void (*cm_connect_complete)(struct rds_connection *conn,
 342                                     struct rdma_cm_event *event);
 343
 344         unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
 345                                         unsigned int avail);
 346         void (*exit)(void);
 347         void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
 348                         struct rds_sock *rs, u32 *key_ret);
 349         void (*sync_mr)(void *trans_private, int direction);
 350         void (*free_mr)(void *trans_private, int invalidate);
 351         void (*flush_mrs)(void);
 352 };
 353
 354 struct rds_sock {
 355         struct sock             rs_sk;
 356
 357         u64                     rs_user_addr;
 358         u64                     rs_user_bytes;
 359
 360         /*
 361          * bound_addr used for both incoming and outgoing, no INADDR_ANY
 362          * support.
 363          */
 364         struct rb_node          rs_bound_node;
 365         __be32                  rs_bound_addr;
 366         __be32                  rs_conn_addr;
 367         __be16                  rs_bound_port;
 368         __be16                  rs_conn_port;
 369
 370         /*
 371          * This is only used to communicate the transport between bind and
 372          * initiating connections.  All other trans use is referenced through
 373          * the connection.
 374          */
 375         struct rds_transport    *rs_transport;
 376
 377         /*
 378          * rds_sendmsg caches the conn it used the last time around.
 379          * This helps avoid costly lookups.
 380          */
 381         struct rds_connection   *rs_conn;
 382
 383         /* flag indicating we were congested or not */
 384         int                     rs_congested;
 385
 386         /* rs_lock protects all these adjacent members before the newline */
 387         spinlock_t              rs_lock;
 388         struct list_head        rs_send_queue;
 389         u32                     rs_snd_bytes;
 390         int                     rs_rcv_bytes;
 391         struct list_head        rs_notify_queue;        /* currently used for failed RDMAs */
 392
 393         /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
 394          * to decide whether the application should be woken up.
 395          * If not set, we use rs_cong_track to find out whether a cong map
 396          * update arrived.
 397          */
 398         uint64_t                rs_cong_mask;
 399         uint64_t                rs_cong_notify;
 400         struct list_head        rs_cong_list;
 401         unsigned long           rs_cong_track;
 402
 403         /*
 404          * rs_recv_lock protects the receive queue, and is
 405          * used to serialize with rds_release.
 406          */
 407         rwlock_t                rs_recv_lock;
 408         struct list_head        rs_recv_queue;
 409
 410         /* just for stats reporting */
 411         struct list_head        rs_item;
 412
 413         /* these have their own lock */
 414         spinlock_t              rs_rdma_lock;
 415         struct rb_root          rs_rdma_keys;
 416
 417         /* Socket options - in case there will be more */
 418         unsigned char           rs_recverr,
 419                                 rs_cong_monitor;
 420 };
 421
 422 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
 423 {
 424         return container_of(sk, struct rds_sock, rs_sk);
 425 }
 426 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
 427 {
 428         return &rs->rs_sk;
 429 }
 430
 431 /*
 432  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
 433  * to account for overhead.  We don't account for overhead, we just apply
 434  * the number of payload bytes to the specified value.
 435  */
 436 static inline int rds_sk_sndbuf(struct rds_sock *rs)
 437 {
 438         return rds_rs_to_sk(rs)->sk_sndbuf / 2;
 439 }
 440 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
 441 {
 442         return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
 443 }
 444
 445 struct rds_statistics {
 446         uint64_t        s_conn_reset;
 447         uint64_t        s_recv_drop_bad_checksum;
 448         uint64_t        s_recv_drop_old_seq;
 449         uint64_t        s_recv_drop_no_sock;
 450         uint64_t        s_recv_drop_dead_sock;
 451         uint64_t        s_recv_deliver_raced;
 452         uint64_t        s_recv_delivered;
 453         uint64_t        s_recv_queued;
 454         uint64_t        s_recv_immediate_retry;
 455         uint64_t        s_recv_delayed_retry;
 456         uint64_t        s_recv_ack_required;
 457         uint64_t        s_recv_rdma_bytes;
 458         uint64_t        s_recv_ping;
 459         uint64_t        s_send_queue_empty;
 460         uint64_t        s_send_queue_full;
 461         uint64_t        s_send_sem_contention;
 462         uint64_t        s_send_sem_queue_raced;
 463         uint64_t        s_send_immediate_retry;
 464         uint64_t        s_send_delayed_retry;
 465         uint64_t        s_send_drop_acked;
 466         uint64_t        s_send_ack_required;
 467         uint64_t        s_send_queued;
 468         uint64_t        s_send_rdma;
 469         uint64_t        s_send_rdma_bytes;
 470         uint64_t        s_send_pong;
 471         uint64_t        s_page_remainder_hit;
 472         uint64_t        s_page_remainder_miss;
 473         uint64_t        s_copy_to_user;
 474         uint64_t        s_copy_from_user;
 475         uint64_t        s_cong_update_queued;
 476         uint64_t        s_cong_update_received;
 477         uint64_t        s_cong_send_error;
 478         uint64_t        s_cong_send_blocked;
 479 };
 480
 481 /* af_rds.c */
 482 void rds_sock_addref(struct rds_sock *rs);
 483 void rds_sock_put(struct rds_sock *rs);
 484 void rds_wake_sk_sleep(struct rds_sock *rs);
 485 static inline void __rds_wake_sk_sleep(struct sock *sk)
 486 {
 487         wait_queue_head_t *waitq = sk->sk_sleep;
 488
 489         if (!sock_flag(sk, SOCK_DEAD) && waitq)
 490                 wake_up(waitq);
 491 }
 492 extern wait_queue_head_t rds_poll_waitq;
 493
 494
 495 /* bind.c */
 496 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 497 void rds_remove_bound(struct rds_sock *rs);
 498 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
 499
 500 /* cong.c */
 501 int rds_cong_get_maps(struct rds_connection *conn);
 502 void rds_cong_add_conn(struct rds_connection *conn);
 503 void rds_cong_remove_conn(struct rds_connection *conn);
 504 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
 505 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
 506 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
 507 void rds_cong_queue_updates(struct rds_cong_map *map);
 508 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
 509 int rds_cong_updated_since(unsigned long *recent);
 510 void rds_cong_add_socket(struct rds_sock *);
 511 void rds_cong_remove_socket(struct rds_sock *);
 512 void rds_cong_exit(void);
 513 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
 514
 515 /* conn.c */
 516 int __init rds_conn_init(void);
 517 void rds_conn_exit(void);
 518 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
 519                                        struct rds_transport *trans, gfp_t gfp);
 520 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
 521                                struct rds_transport *trans, gfp_t gfp);
 522 void rds_conn_destroy(struct rds_connection *conn);
 523 void rds_conn_reset(struct rds_connection *conn);
 524 void rds_conn_drop(struct rds_connection *conn);
 525 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
 526                           struct rds_info_iterator *iter,
 527                           struct rds_info_lengths *lens,
 528                           int (*visitor)(struct rds_connection *, void *),
 529                           size_t item_len);
 530 void __rds_conn_error(struct rds_connection *conn, const char *, ...)
 531                                 __attribute__ ((format (printf, 2, 3)));
 532 #define rds_conn_error(conn, fmt...) \
 533         __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
 534
 535 static inline int
 536 rds_conn_transition(struct rds_connection *conn, int old, int new)
 537 {
 538         return atomic_cmpxchg(&conn->c_state, old, new) == old;
 539 }
 540
 541 static inline int
 542 rds_conn_state(struct rds_connection *conn)
 543 {
 544         return atomic_read(&conn->c_state);
 545 }
 546
 547 static inline int
 548 rds_conn_up(struct rds_connection *conn)
 549 {
 550         return atomic_read(&conn->c_state) == RDS_CONN_UP;
 551 }
 552
 553 static inline int
 554 rds_conn_connecting(struct rds_connection *conn)
 555 {
 556         return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
 557 }
 558
 559 /* message.c */
 560 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
 561 struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
 562                                                size_t total_len);
 563 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
 564 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
 565                                  __be16 dport, u64 seq);
 566 int rds_message_add_extension(struct rds_header *hdr,
 567                               unsigned int type, const void *data, unsigned int len);
 568 int rds_message_next_extension(struct rds_header *hdr,
 569                                unsigned int *pos, void *buf, unsigned int *buflen);
 570 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version);
 571 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version);
 572 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
 573 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
 574                                  struct iovec *first_iov, size_t size);
 575 void rds_message_inc_purge(struct rds_incoming *inc);
 576 void rds_message_inc_free(struct rds_incoming *inc);
 577 void rds_message_addref(struct rds_message *rm);
 578 void rds_message_put(struct rds_message *rm);
 579 void rds_message_wait(struct rds_message *rm);
 580 void rds_message_unmapped(struct rds_message *rm);
 581
 582 static inline void rds_message_make_checksum(struct rds_header *hdr)
 583 {
 584         hdr->h_csum = 0;
 585         hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
 586 }
 587
 588 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
 589 {
 590         return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
 591 }
 592
 593
 594 /* page.c */
 595 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
 596                              gfp_t gfp);
 597 int rds_page_copy_user(struct page *page, unsigned long offset,
 598                        void __user *ptr, unsigned long bytes,
 599                        int to_user);
 600 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
 601         rds_page_copy_user(page, offset, ptr, bytes, 1)
 602 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
 603         rds_page_copy_user(page, offset, ptr, bytes, 0)
 604 void rds_page_exit(void);
 605
 606 /* recv.c */
 607 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
 608                   __be32 saddr);
 609 void rds_inc_addref(struct rds_incoming *inc);
 610 void rds_inc_put(struct rds_incoming *inc);
 611 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
 612                        struct rds_incoming *inc, gfp_t gfp, enum km_type km);
 613 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 614                 size_t size, int msg_flags);
 615 void rds_clear_recv_queue(struct rds_sock *rs);
 616 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
 617 void rds_inc_info_copy(struct rds_incoming *inc,
 618                        struct rds_info_iterator *iter,
 619                        __be32 saddr, __be32 daddr, int flip);
 620
 621 /* send.c */
 622 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 623                 size_t payload_len);
 624 void rds_send_reset(struct rds_connection *conn);
 625 int rds_send_xmit(struct rds_connection *conn);
 626 struct sockaddr_in;
 627 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
 628 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
 629 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
 630                          is_acked_func is_acked);
 631 int rds_send_acked_before(struct rds_connection *conn, u64 seq);
 632 void rds_send_remove_from_sock(struct list_head *messages, int status);
 633 int rds_send_pong(struct rds_connection *conn, __be16 dport);
 634 struct rds_message *rds_send_get_message(struct rds_connection *,
 635                                          struct rds_rdma_op *);
 636
 637 /* rdma.c */
 638 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
 639
 640 /* stats.c */
 641 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
 642 #define rds_stats_inc_which(which, member) do {         \
 643         per_cpu(which, get_cpu()).member++;             \
 644         put_cpu();                                      \
 645 } while (0)
 646 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
 647 #define rds_stats_add_which(which, member, count) do {          \
 648         per_cpu(which, get_cpu()).member += count;      \
 649         put_cpu();                                      \
 650 } while (0)
 651 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
 652 int __init rds_stats_init(void);
 653 void rds_stats_exit(void);
 654 void rds_stats_info_copy(struct rds_info_iterator *iter,
 655                          uint64_t *values, char **names, size_t nr);
 656
 657 /* sysctl.c */
 658 int __init rds_sysctl_init(void);
 659 void rds_sysctl_exit(void);
 660 extern unsigned long rds_sysctl_sndbuf_min;
 661 extern unsigned long rds_sysctl_sndbuf_default;
 662 extern unsigned long rds_sysctl_sndbuf_max;
 663 extern unsigned long rds_sysctl_reconnect_min_jiffies;
 664 extern unsigned long rds_sysctl_reconnect_max_jiffies;
 665 extern unsigned int  rds_sysctl_max_unacked_packets;
 666 extern unsigned int  rds_sysctl_max_unacked_bytes;
 667 extern unsigned int  rds_sysctl_ping_enable;
 668 extern unsigned long rds_sysctl_trace_flags;
 669 extern unsigned int  rds_sysctl_trace_level;
 670
 671 /* threads.c */
 672 int __init rds_threads_init(void);
 673 void rds_threads_exit(void);
 674 extern struct workqueue_struct *rds_wq;
 675 void rds_connect_worker(struct work_struct *);
 676 void rds_shutdown_worker(struct work_struct *);
 677 void rds_send_worker(struct work_struct *);
 678 void rds_recv_worker(struct work_struct *);
 679 void rds_connect_complete(struct rds_connection *conn);
 680
 681 /* transport.c */
 682 int rds_trans_register(struct rds_transport *trans);
 683 void rds_trans_unregister(struct rds_transport *trans);
 684 struct rds_transport *rds_trans_get_preferred(__be32 addr);
 685 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
 686                                        unsigned int avail);
 687 int __init rds_trans_init(void);
 688 void rds_trans_exit(void);
 689
 690 #endif