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