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 __printf(1, 2)
  40 void 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
  56 struct 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  */
  71 enum {
  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
  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 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
 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 struct 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
 232 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
 233 {
 234         return r_key | (((u64) offset) << 32);
 235 }
 236
 237 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
 238 {
 239         return cookie;
 240 }
 241
 242 static 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
 288 struct 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  */
 377 struct 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
 415 struct 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
 454 struct 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
 518 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
 519 {
 520         return container_of(sk, struct rds_sock, rs_sk);
 521 }
 522 static 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  */
 532 static inline int rds_sk_sndbuf(struct rds_sock *rs)
 533 {
 534         return rds_rs_to_sk(rs)->sk_sndbuf / 2;
 535 }
 536 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
 537 {
 538         return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
 539 }
 540
 541 struct 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 */
 578 char *rds_str_array(char **array, size_t elements, size_t index);
 579 void rds_sock_addref(struct rds_sock *rs);
 580 void rds_sock_put(struct rds_sock *rs);
 581 void rds_wake_sk_sleep(struct rds_sock *rs);
 582 static 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 }
 589 extern wait_queue_head_t rds_poll_waitq;
 590
 591
 592 /* bind.c */
 593 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 594 void rds_remove_bound(struct rds_sock *rs);
 595 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
 596
 597 /* cong.c */
 598 int rds_cong_get_maps(struct rds_connection *conn);
 599 void rds_cong_add_conn(struct rds_connection *conn);
 600 void rds_cong_remove_conn(struct rds_connection *conn);
 601 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
 602 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
 603 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
 604 void rds_cong_queue_updates(struct rds_cong_map *map);
 605 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
 606 int rds_cong_updated_since(unsigned long *recent);
 607 void rds_cong_add_socket(struct rds_sock *);
 608 void rds_cong_remove_socket(struct rds_sock *);
 609 void rds_cong_exit(void);
 610 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
 611
 612 /* conn.c */
 613 int rds_conn_init(void);
 614 void rds_conn_exit(void);
 615 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
 616                                        struct rds_transport *trans, gfp_t gfp);
 617 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
 618                                struct rds_transport *trans, gfp_t gfp);
 619 void rds_conn_shutdown(struct rds_connection *conn);
 620 void rds_conn_destroy(struct rds_connection *conn);
 621 void rds_conn_drop(struct rds_connection *conn);
 622 void rds_conn_connect_if_down(struct rds_connection *conn);
 623 void 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)
 629 void __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
 633 static inline int
 634 rds_conn_transition(struct rds_connection *conn, int old, int new)
 635 {
 636         return atomic_cmpxchg(&conn->c_state, old, new) == old;
 637 }
 638
 639 static inline int
 640 rds_conn_state(struct rds_connection *conn)
 641 {
 642         return atomic_read(&conn->c_state);
 643 }
 644
 645 static inline int
 646 rds_conn_up(struct rds_connection *conn)
 647 {
 648         return atomic_read(&conn->c_state) == RDS_CONN_UP;
 649 }
 650
 651 static inline int
 652 rds_conn_connecting(struct rds_connection *conn)
 653 {
 654         return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
 655 }
 656
 657 /* message.c */
 658 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
 659 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
 660 int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
 661                                                size_t total_len);
 662 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
 663 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
 664                                  __be16 dport, u64 seq);
 665 int rds_message_add_extension(struct rds_header *hdr,
 666                               unsigned int type, const void *data, unsigned int len);
 667 int rds_message_next_extension(struct rds_header *hdr,
 668                                unsigned int *pos, void *buf, unsigned int *buflen);
 669 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
 670 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
 671                                  struct iovec *first_iov, size_t size);
 672 void rds_message_inc_free(struct rds_incoming *inc);
 673 void rds_message_addref(struct rds_message *rm);
 674 void rds_message_put(struct rds_message *rm);
 675 void rds_message_wait(struct rds_message *rm);
 676 void rds_message_unmapped(struct rds_message *rm);
 677
 678 static 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
 684 static 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 */
 691 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
 692                              gfp_t gfp);
 693 int 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)
 700 void rds_page_exit(void);
 701
 702 /* recv.c */
 703 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
 704                   __be32 saddr);
 705 void rds_inc_put(struct rds_incoming *inc);
 706 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
 707                        struct rds_incoming *inc, gfp_t gfp);
 708 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 709                 size_t size, int msg_flags);
 710 void rds_clear_recv_queue(struct rds_sock *rs);
 711 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
 712 void 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 */
 717 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 718                 size_t payload_len);
 719 void rds_send_reset(struct rds_connection *conn);
 720 int rds_send_xmit(struct rds_connection *conn);
 721 struct sockaddr_in;
 722 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
 723 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
 724 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
 725                          is_acked_func is_acked);
 726 int rds_send_pong(struct rds_connection *conn, __be16 dport);
 727 struct rds_message *rds_send_get_message(struct rds_connection *,
 728                                          struct rm_rdma_op *);
 729
 730 /* rdma.c */
 731 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
 732 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
 733 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
 734 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
 735 void rds_rdma_drop_keys(struct rds_sock *rs);
 736 int rds_rdma_extra_size(struct rds_rdma_args *args);
 737 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
 738                           struct cmsghdr *cmsg);
 739 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
 740                           struct cmsghdr *cmsg);
 741 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
 742                           struct cmsghdr *cmsg);
 743 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
 744                           struct cmsghdr *cmsg);
 745 void rds_rdma_free_op(struct rm_rdma_op *ro);
 746 void rds_atomic_free_op(struct rm_atomic_op *ao);
 747 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
 748 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
 749 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
 750                     struct cmsghdr *cmsg);
 751
 752 extern void __rds_put_mr_final(struct rds_mr *mr);
 753 static 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 */
 760 DECLARE_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)
 771 int rds_stats_init(void);
 772 void rds_stats_exit(void);
 773 void 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 */
 778 int rds_sysctl_init(void);
 779 void rds_sysctl_exit(void);
 780 extern unsigned long rds_sysctl_sndbuf_min;
 781 extern unsigned long rds_sysctl_sndbuf_default;
 782 extern unsigned long rds_sysctl_sndbuf_max;
 783 extern unsigned long rds_sysctl_reconnect_min_jiffies;
 784 extern unsigned long rds_sysctl_reconnect_max_jiffies;
 785 extern unsigned int  rds_sysctl_max_unacked_packets;
 786 extern unsigned int  rds_sysctl_max_unacked_bytes;
 787 extern unsigned int  rds_sysctl_ping_enable;
 788 extern unsigned long rds_sysctl_trace_flags;
 789 extern unsigned int  rds_sysctl_trace_level;
 790
 791 /* threads.c */
 792 int rds_threads_init(void);
 793 void rds_threads_exit(void);
 794 extern struct workqueue_struct *rds_wq;
 795 void rds_queue_reconnect(struct rds_connection *conn);
 796 void rds_connect_worker(struct work_struct *);
 797 void rds_shutdown_worker(struct work_struct *);
 798 void rds_send_worker(struct work_struct *);
 799 void rds_recv_worker(struct work_struct *);
 800 void rds_connect_complete(struct rds_connection *conn);
 801
 802 /* transport.c */
 803 int rds_trans_register(struct rds_transport *trans);
 804 void rds_trans_unregister(struct rds_transport *trans);
 805 struct rds_transport *rds_trans_get_preferred(__be32 addr);
 806 void rds_trans_put(struct rds_transport *trans);
 807 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
 808                                        unsigned int avail);
 809 int rds_trans_init(void);
 810 void rds_trans_exit(void);
 811
 812 #endif