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