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 #include <linux/rhashtable.h>
  11
  12 #include "info.h"
  13
  14 /*
  15  * RDS Network protocol version
  16  */
  17 #define RDS_PROTOCOL_3_0        0x0300
  18 #define RDS_PROTOCOL_3_1        0x0301
  19 #define RDS_PROTOCOL_VERSION    RDS_PROTOCOL_3_1
  20 #define RDS_PROTOCOL_MAJOR(v)   ((v) >> 8)
  21 #define RDS_PROTOCOL_MINOR(v)   ((v) & 255)
  22 #define RDS_PROTOCOL(maj, min)  (((maj) << 8) | min)
  23
  24 /*
  25  * XXX randomly chosen, but at least seems to be unused:
  26  * #               18464-18768 Unassigned
  27  * We should do better.  We want a reserved port to discourage unpriv'ed
  28  * userspace from listening.
  29  */
  30 #define RDS_PORT        18634
  31
  32 #ifdef ATOMIC64_INIT
  33 #define KERNEL_HAS_ATOMIC64
  34 #endif
  35
  36 #ifdef DEBUG
  37 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
  38 #else
  39 /* sigh, pr_debug() causes unused variable warnings */
  40 static inline __printf(1, 2)
  41 void rdsdebug(char *fmt, ...)
  42 {
  43 }
  44 #endif
  45
  46 /* XXX is there one of these somewhere? */
  47 #define ceil(x, y) \
  48         ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
  49
  50 #define RDS_FRAG_SHIFT  12
  51 #define RDS_FRAG_SIZE   ((unsigned int)(1 << RDS_FRAG_SHIFT))
  52
  53 #define RDS_CONG_MAP_BYTES      (65536 / 8)
  54 #define RDS_CONG_MAP_PAGES      (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
  55 #define RDS_CONG_MAP_PAGE_BITS  (PAGE_SIZE * 8)
  56
  57 struct rds_cong_map {
  58         struct rb_node          m_rb_node;
  59         __be32                  m_addr;
  60         wait_queue_head_t       m_waitq;
  61         struct list_head        m_conn_list;
  62         unsigned long           m_page_addrs[RDS_CONG_MAP_PAGES];
  63 };
  64
  65
  66 /*
  67  * This is how we will track the connection state:
  68  * A connection is always in one of the following
  69  * states. Updates to the state are atomic and imply
  70  * a memory barrier.
  71  */
  72 enum {
  73         RDS_CONN_DOWN = 0,
  74         RDS_CONN_CONNECTING,
  75         RDS_CONN_DISCONNECTING,
  76         RDS_CONN_UP,
  77         RDS_CONN_ERROR,
  78 };
  79
  80 /* Bits for c_flags */
  81 #define RDS_LL_SEND_FULL        0
  82 #define RDS_RECONNECT_PENDING   1
  83 #define RDS_IN_XMIT             2
  84 #define RDS_RECV_REFILL         3
  85
  86 struct rds_connection {
  87         struct hlist_node       c_hash_node;
  88         __be32                  c_laddr;
  89         __be32                  c_faddr;
  90         unsigned int            c_loopback:1,
  91                                 c_outgoing:1,
  92                                 c_pad_to_32:30;
  93         struct rds_connection   *c_passive;
  94
  95         struct rds_cong_map     *c_lcong;
  96         struct rds_cong_map     *c_fcong;
  97
  98         struct rds_message      *c_xmit_rm;
  99         unsigned long           c_xmit_sg;
 100         unsigned int            c_xmit_hdr_off;
 101         unsigned int            c_xmit_data_off;
 102         unsigned int            c_xmit_atomic_sent;
 103         unsigned int            c_xmit_rdma_sent;
 104         unsigned int            c_xmit_data_sent;
 105
 106         spinlock_t              c_lock;         /* protect msg queues */
 107         u64                     c_next_tx_seq;
 108         struct list_head        c_send_queue;
 109         struct list_head        c_retrans;
 110
 111         u64                     c_next_rx_seq;
 112
 113         struct rds_transport    *c_trans;
 114         void                    *c_transport_data;
 115
 116         atomic_t                c_state;
 117         unsigned long           c_send_gen;
 118         unsigned long           c_flags;
 119         unsigned long           c_reconnect_jiffies;
 120         struct delayed_work     c_send_w;
 121         struct delayed_work     c_recv_w;
 122         struct delayed_work     c_conn_w;
 123         struct work_struct      c_down_w;
 124         struct mutex            c_cm_lock;      /* protect conn state & cm */
 125         wait_queue_head_t       c_waitq;
 126
 127         struct list_head        c_map_item;
 128         unsigned long           c_map_queued;
 129
 130         unsigned int            c_unacked_packets;
 131         unsigned int            c_unacked_bytes;
 132
 133         /* Protocol version */
 134         unsigned int            c_version;
 135         possible_net_t          c_net;
 136 };
 137
 138 static inline
 139 struct net *rds_conn_net(struct rds_connection *conn)
 140 {
 141         return read_pnet(&conn->c_net);
 142 }
 143
 144 static inline
 145 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
 146 {
 147         write_pnet(&conn->c_net, net);
 148 }
 149
 150 #define RDS_FLAG_CONG_BITMAP    0x01
 151 #define RDS_FLAG_ACK_REQUIRED   0x02
 152 #define RDS_FLAG_RETRANSMITTED  0x04
 153 #define RDS_MAX_ADV_CREDIT      255
 154
 155 /*
 156  * Maximum space available for extension headers.
 157  */
 158 #define RDS_HEADER_EXT_SPACE    16
 159
 160 struct rds_header {
 161         __be64  h_sequence;
 162         __be64  h_ack;
 163         __be32  h_len;
 164         __be16  h_sport;
 165         __be16  h_dport;
 166         u8      h_flags;
 167         u8      h_credit;
 168         u8      h_padding[4];
 169         __sum16 h_csum;
 170
 171         u8      h_exthdr[RDS_HEADER_EXT_SPACE];
 172 };
 173
 174 /*
 175  * Reserved - indicates end of extensions
 176  */
 177 #define RDS_EXTHDR_NONE         0
 178
 179 /*
 180  * This extension header is included in the very
 181  * first message that is sent on a new connection,
 182  * and identifies the protocol level. This will help
 183  * rolling updates if a future change requires breaking
 184  * the protocol.
 185  * NB: This is no longer true for IB, where we do a version
 186  * negotiation during the connection setup phase (protocol
 187  * version information is included in the RDMA CM private data).
 188  */
 189 #define RDS_EXTHDR_VERSION      1
 190 struct rds_ext_header_version {
 191         __be32                  h_version;
 192 };
 193
 194 /*
 195  * This extension header is included in the RDS message
 196  * chasing an RDMA operation.
 197  */
 198 #define RDS_EXTHDR_RDMA         2
 199 struct rds_ext_header_rdma {
 200         __be32                  h_rdma_rkey;
 201 };
 202
 203 /*
 204  * This extension header tells the peer about the
 205  * destination <R_Key,offset> of the requested RDMA
 206  * operation.
 207  */
 208 #define RDS_EXTHDR_RDMA_DEST    3
 209 struct rds_ext_header_rdma_dest {
 210         __be32                  h_rdma_rkey;
 211         __be32                  h_rdma_offset;
 212 };
 213
 214 #define __RDS_EXTHDR_MAX        16 /* for now */
 215
 216 struct rds_incoming {
 217         atomic_t                i_refcount;
 218         struct list_head        i_item;
 219         struct rds_connection   *i_conn;
 220         struct rds_header       i_hdr;
 221         unsigned long           i_rx_jiffies;
 222         __be32                  i_saddr;
 223
 224         rds_rdma_cookie_t       i_rdma_cookie;
 225         struct timeval          i_rx_tstamp;
 226 };
 227
 228 struct rds_mr {
 229         struct rb_node          r_rb_node;
 230         atomic_t                r_refcount;
 231         u32                     r_key;
 232
 233         /* A copy of the creation flags */
 234         unsigned int            r_use_once:1;
 235         unsigned int            r_invalidate:1;
 236         unsigned int            r_write:1;
 237
 238         /* This is for RDS_MR_DEAD.
 239          * It would be nice & consistent to make this part of the above
 240          * bit field here, but we need to use test_and_set_bit.
 241          */
 242         unsigned long           r_state;
 243         struct rds_sock         *r_sock; /* back pointer to the socket that owns us */
 244         struct rds_transport    *r_trans;
 245         void                    *r_trans_private;
 246 };
 247
 248 /* Flags for mr->r_state */
 249 #define RDS_MR_DEAD             0
 250
 251 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
 252 {
 253         return r_key | (((u64) offset) << 32);
 254 }
 255
 256 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
 257 {
 258         return cookie;
 259 }
 260
 261 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
 262 {
 263         return cookie >> 32;
 264 }
 265
 266 /* atomic operation types */
 267 #define RDS_ATOMIC_TYPE_CSWP            0
 268 #define RDS_ATOMIC_TYPE_FADD            1
 269
 270 /*
 271  * m_sock_item and m_conn_item are on lists that are serialized under
 272  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
 273  * the message will not be put back on the retransmit list after being sent.
 274  * messages that are canceled while being sent rely on this.
 275  *
 276  * m_inc is used by loopback so that it can pass an incoming message straight
 277  * back up into the rx path.  It embeds a wire header which is also used by
 278  * the send path, which is kind of awkward.
 279  *
 280  * m_sock_item indicates the message's presence on a socket's send or receive
 281  * queue.  m_rs will point to that socket.
 282  *
 283  * m_daddr is used by cancellation to prune messages to a given destination.
 284  *
 285  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
 286  * nesting.  As paths iterate over messages on a sock, or conn, they must
 287  * also lock the conn, or sock, to remove the message from those lists too.
 288  * Testing the flag to determine if the message is still on the lists lets
 289  * us avoid testing the list_head directly.  That means each path can use
 290  * the message's list_head to keep it on a local list while juggling locks
 291  * without confusing the other path.
 292  *
 293  * m_ack_seq is an optional field set by transports who need a different
 294  * sequence number range to invalidate.  They can use this in a callback
 295  * that they pass to rds_send_drop_acked() to see if each message has been
 296  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
 297  * had ack_seq set yet.
 298  */
 299 #define RDS_MSG_ON_SOCK         1
 300 #define RDS_MSG_ON_CONN         2
 301 #define RDS_MSG_HAS_ACK_SEQ     3
 302 #define RDS_MSG_ACK_REQUIRED    4
 303 #define RDS_MSG_RETRANSMITTED   5
 304 #define RDS_MSG_MAPPED          6
 305 #define RDS_MSG_PAGEVEC         7
 306
 307 struct rds_message {
 308         atomic_t                m_refcount;
 309         struct list_head        m_sock_item;
 310         struct list_head        m_conn_item;
 311         struct rds_incoming     m_inc;
 312         u64                     m_ack_seq;
 313         __be32                  m_daddr;
 314         unsigned long           m_flags;
 315
 316         /* Never access m_rs without holding m_rs_lock.
 317          * Lock nesting is
 318          *  rm->m_rs_lock
 319          *   -> rs->rs_lock
 320          */
 321         spinlock_t              m_rs_lock;
 322         wait_queue_head_t       m_flush_wait;
 323
 324         struct rds_sock         *m_rs;
 325
 326         /* cookie to send to remote, in rds header */
 327         rds_rdma_cookie_t       m_rdma_cookie;
 328
 329         unsigned int            m_used_sgs;
 330         unsigned int            m_total_sgs;
 331
 332         void                    *m_final_op;
 333
 334         struct {
 335                 struct rm_atomic_op {
 336                         int                     op_type;
 337                         union {
 338                                 struct {
 339                                         uint64_t        compare;
 340                                         uint64_t        swap;
 341                                         uint64_t        compare_mask;
 342                                         uint64_t        swap_mask;
 343                                 } op_m_cswp;
 344                                 struct {
 345                                         uint64_t        add;
 346                                         uint64_t        nocarry_mask;
 347                                 } op_m_fadd;
 348                         };
 349
 350                         u32                     op_rkey;
 351                         u64                     op_remote_addr;
 352                         unsigned int            op_notify:1;
 353                         unsigned int            op_recverr:1;
 354                         unsigned int            op_mapped:1;
 355                         unsigned int            op_silent:1;
 356                         unsigned int            op_active:1;
 357                         struct scatterlist      *op_sg;
 358                         struct rds_notifier     *op_notifier;
 359
 360                         struct rds_mr           *op_rdma_mr;
 361                 } atomic;
 362                 struct rm_rdma_op {
 363                         u32                     op_rkey;
 364                         u64                     op_remote_addr;
 365                         unsigned int            op_write:1;
 366                         unsigned int            op_fence:1;
 367                         unsigned int            op_notify:1;
 368                         unsigned int            op_recverr:1;
 369                         unsigned int            op_mapped:1;
 370                         unsigned int            op_silent:1;
 371                         unsigned int            op_active:1;
 372                         unsigned int            op_bytes;
 373                         unsigned int            op_nents;
 374                         unsigned int            op_count;
 375                         struct scatterlist      *op_sg;
 376                         struct rds_notifier     *op_notifier;
 377
 378                         struct rds_mr           *op_rdma_mr;
 379                 } rdma;
 380                 struct rm_data_op {
 381                         unsigned int            op_active:1;
 382                         unsigned int            op_nents;
 383                         unsigned int            op_count;
 384                         unsigned int            op_dmasg;
 385                         unsigned int            op_dmaoff;
 386                         struct scatterlist      *op_sg;
 387                 } data;
 388         };
 389 };
 390
 391 /*
 392  * The RDS notifier is used (optionally) to tell the application about
 393  * completed RDMA operations. Rather than keeping the whole rds message
 394  * around on the queue, we allocate a small notifier that is put on the
 395  * socket's notifier_list. Notifications are delivered to the application
 396  * through control messages.
 397  */
 398 struct rds_notifier {
 399         struct list_head        n_list;
 400         uint64_t                n_user_token;
 401         int                     n_status;
 402 };
 403
 404 /**
 405  * struct rds_transport -  transport specific behavioural hooks
 406  *
 407  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
 408  *        part of a message.  The caller serializes on the send_sem so this
 409  *        doesn't need to be reentrant for a given conn.  The header must be
 410  *        sent before the data payload.  .xmit must be prepared to send a
 411  *        message with no data payload.  .xmit should return the number of
 412  *        bytes that were sent down the connection, including header bytes.
 413  *        Returning 0 tells the caller that it doesn't need to perform any
 414  *        additional work now.  This is usually the case when the transport has
 415  *        filled the sending queue for its connection and will handle
 416  *        triggering the rds thread to continue the send when space becomes
 417  *        available.  Returning -EAGAIN tells the caller to retry the send
 418  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
 419  *        some point in the future.
 420  *
 421  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
 422  *                 it returns the connection can not call rds_recv_incoming().
 423  *                 This will only be called once after conn_connect returns
 424  *                 non-zero success and will The caller serializes this with
 425  *                 the send and connecting paths (xmit_* and conn_*).  The
 426  *                 transport is responsible for other serialization, including
 427  *                 rds_recv_incoming().  This is called in process context but
 428  *                 should try hard not to block.
 429  */
 430
 431 struct rds_transport {
 432         char                    t_name[TRANSNAMSIZ];
 433         struct list_head        t_item;
 434         struct module           *t_owner;
 435         unsigned int            t_prefer_loopback:1;
 436         unsigned int            t_type;
 437
 438         int (*laddr_check)(struct net *net, __be32 addr);
 439         int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
 440         void (*conn_free)(void *data);
 441         int (*conn_connect)(struct rds_connection *conn);
 442         void (*conn_shutdown)(struct rds_connection *conn);
 443         void (*xmit_prepare)(struct rds_connection *conn);
 444         void (*xmit_complete)(struct rds_connection *conn);
 445         int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
 446                     unsigned int hdr_off, unsigned int sg, unsigned int off);
 447         int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
 448         int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
 449         int (*recv)(struct rds_connection *conn);
 450         int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
 451         void (*inc_free)(struct rds_incoming *inc);
 452
 453         int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
 454                                  struct rdma_cm_event *event);
 455         int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
 456         void (*cm_connect_complete)(struct rds_connection *conn,
 457                                     struct rdma_cm_event *event);
 458
 459         unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
 460                                         unsigned int avail);
 461         void (*exit)(void);
 462         void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
 463                         struct rds_sock *rs, u32 *key_ret);
 464         void (*sync_mr)(void *trans_private, int direction);
 465         void (*free_mr)(void *trans_private, int invalidate);
 466         void (*flush_mrs)(void);
 467 };
 468
 469 struct rds_sock {
 470         struct sock             rs_sk;
 471
 472         u64                     rs_user_addr;
 473         u64                     rs_user_bytes;
 474
 475         /*
 476          * bound_addr used for both incoming and outgoing, no INADDR_ANY
 477          * support.
 478          */
 479         struct rhash_head       rs_bound_node;
 480         u64                     rs_bound_key;
 481         __be32                  rs_bound_addr;
 482         __be32                  rs_conn_addr;
 483         __be16                  rs_bound_port;
 484         __be16                  rs_conn_port;
 485         struct rds_transport    *rs_transport;
 486
 487         /*
 488          * rds_sendmsg caches the conn it used the last time around.
 489          * This helps avoid costly lookups.
 490          */
 491         struct rds_connection   *rs_conn;
 492
 493         /* flag indicating we were congested or not */
 494         int                     rs_congested;
 495         /* seen congestion (ENOBUFS) when sending? */
 496         int                     rs_seen_congestion;
 497
 498         /* rs_lock protects all these adjacent members before the newline */
 499         spinlock_t              rs_lock;
 500         struct list_head        rs_send_queue;
 501         u32                     rs_snd_bytes;
 502         int                     rs_rcv_bytes;
 503         struct list_head        rs_notify_queue;        /* currently used for failed RDMAs */
 504
 505         /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
 506          * to decide whether the application should be woken up.
 507          * If not set, we use rs_cong_track to find out whether a cong map
 508          * update arrived.
 509          */
 510         uint64_t                rs_cong_mask;
 511         uint64_t                rs_cong_notify;
 512         struct list_head        rs_cong_list;
 513         unsigned long           rs_cong_track;
 514
 515         /*
 516          * rs_recv_lock protects the receive queue, and is
 517          * used to serialize with rds_release.
 518          */
 519         rwlock_t                rs_recv_lock;
 520         struct list_head        rs_recv_queue;
 521
 522         /* just for stats reporting */
 523         struct list_head        rs_item;
 524
 525         /* these have their own lock */
 526         spinlock_t              rs_rdma_lock;
 527         struct rb_root          rs_rdma_keys;
 528
 529         /* Socket options - in case there will be more */
 530         unsigned char           rs_recverr,
 531                                 rs_cong_monitor;
 532 };
 533
 534 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
 535 {
 536         return container_of(sk, struct rds_sock, rs_sk);
 537 }
 538 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
 539 {
 540         return &rs->rs_sk;
 541 }
 542
 543 /*
 544  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
 545  * to account for overhead.  We don't account for overhead, we just apply
 546  * the number of payload bytes to the specified value.
 547  */
 548 static inline int rds_sk_sndbuf(struct rds_sock *rs)
 549 {
 550         return rds_rs_to_sk(rs)->sk_sndbuf / 2;
 551 }
 552 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
 553 {
 554         return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
 555 }
 556
 557 struct rds_statistics {
 558         uint64_t        s_conn_reset;
 559         uint64_t        s_recv_drop_bad_checksum;
 560         uint64_t        s_recv_drop_old_seq;
 561         uint64_t        s_recv_drop_no_sock;
 562         uint64_t        s_recv_drop_dead_sock;
 563         uint64_t        s_recv_deliver_raced;
 564         uint64_t        s_recv_delivered;
 565         uint64_t        s_recv_queued;
 566         uint64_t        s_recv_immediate_retry;
 567         uint64_t        s_recv_delayed_retry;
 568         uint64_t        s_recv_ack_required;
 569         uint64_t        s_recv_rdma_bytes;
 570         uint64_t        s_recv_ping;
 571         uint64_t        s_send_queue_empty;
 572         uint64_t        s_send_queue_full;
 573         uint64_t        s_send_lock_contention;
 574         uint64_t        s_send_lock_queue_raced;
 575         uint64_t        s_send_immediate_retry;
 576         uint64_t        s_send_delayed_retry;
 577         uint64_t        s_send_drop_acked;
 578         uint64_t        s_send_ack_required;
 579         uint64_t        s_send_queued;
 580         uint64_t        s_send_rdma;
 581         uint64_t        s_send_rdma_bytes;
 582         uint64_t        s_send_pong;
 583         uint64_t        s_page_remainder_hit;
 584         uint64_t        s_page_remainder_miss;
 585         uint64_t        s_copy_to_user;
 586         uint64_t        s_copy_from_user;
 587         uint64_t        s_cong_update_queued;
 588         uint64_t        s_cong_update_received;
 589         uint64_t        s_cong_send_error;
 590         uint64_t        s_cong_send_blocked;
 591 };
 592
 593 /* af_rds.c */
 594 void rds_sock_addref(struct rds_sock *rs);
 595 void rds_sock_put(struct rds_sock *rs);
 596 void rds_wake_sk_sleep(struct rds_sock *rs);
 597 static inline void __rds_wake_sk_sleep(struct sock *sk)
 598 {
 599         wait_queue_head_t *waitq = sk_sleep(sk);
 600
 601         if (!sock_flag(sk, SOCK_DEAD) && waitq)
 602                 wake_up(waitq);
 603 }
 604 extern wait_queue_head_t rds_poll_waitq;
 605
 606
 607 /* bind.c */
 608 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 609 void rds_remove_bound(struct rds_sock *rs);
 610 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
 611 int rds_bind_lock_init(void);
 612 void rds_bind_lock_destroy(void);
 613
 614 /* cong.c */
 615 int rds_cong_get_maps(struct rds_connection *conn);
 616 void rds_cong_add_conn(struct rds_connection *conn);
 617 void rds_cong_remove_conn(struct rds_connection *conn);
 618 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
 619 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
 620 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
 621 void rds_cong_queue_updates(struct rds_cong_map *map);
 622 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
 623 int rds_cong_updated_since(unsigned long *recent);
 624 void rds_cong_add_socket(struct rds_sock *);
 625 void rds_cong_remove_socket(struct rds_sock *);
 626 void rds_cong_exit(void);
 627 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
 628
 629 /* conn.c */
 630 int rds_conn_init(void);
 631 void rds_conn_exit(void);
 632 struct rds_connection *rds_conn_create(struct net *net,
 633                                        __be32 laddr, __be32 faddr,
 634                                        struct rds_transport *trans, gfp_t gfp);
 635 struct rds_connection *rds_conn_create_outgoing(struct net *net,
 636                                                 __be32 laddr, __be32 faddr,
 637                                struct rds_transport *trans, gfp_t gfp);
 638 void rds_conn_shutdown(struct rds_connection *conn);
 639 void rds_conn_destroy(struct rds_connection *conn);
 640 void rds_conn_drop(struct rds_connection *conn);
 641 void rds_conn_connect_if_down(struct rds_connection *conn);
 642 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
 643                           struct rds_info_iterator *iter,
 644                           struct rds_info_lengths *lens,
 645                           int (*visitor)(struct rds_connection *, void *),
 646                           size_t item_len);
 647 __printf(2, 3)
 648 void __rds_conn_error(struct rds_connection *conn, const char *, ...);
 649 #define rds_conn_error(conn, fmt...) \
 650         __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
 651
 652 static inline int
 653 rds_conn_transition(struct rds_connection *conn, int old, int new)
 654 {
 655         return atomic_cmpxchg(&conn->c_state, old, new) == old;
 656 }
 657
 658 static inline int
 659 rds_conn_state(struct rds_connection *conn)
 660 {
 661         return atomic_read(&conn->c_state);
 662 }
 663
 664 static inline int
 665 rds_conn_up(struct rds_connection *conn)
 666 {
 667         return atomic_read(&conn->c_state) == RDS_CONN_UP;
 668 }
 669
 670 static inline int
 671 rds_conn_connecting(struct rds_connection *conn)
 672 {
 673         return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
 674 }
 675
 676 /* message.c */
 677 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
 678 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
 679 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
 680 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
 681 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
 682                                  __be16 dport, u64 seq);
 683 int rds_message_add_extension(struct rds_header *hdr,
 684                               unsigned int type, const void *data, unsigned int len);
 685 int rds_message_next_extension(struct rds_header *hdr,
 686                                unsigned int *pos, void *buf, unsigned int *buflen);
 687 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
 688 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 689 void rds_message_inc_free(struct rds_incoming *inc);
 690 void rds_message_addref(struct rds_message *rm);
 691 void rds_message_put(struct rds_message *rm);
 692 void rds_message_wait(struct rds_message *rm);
 693 void rds_message_unmapped(struct rds_message *rm);
 694
 695 static inline void rds_message_make_checksum(struct rds_header *hdr)
 696 {
 697         hdr->h_csum = 0;
 698         hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
 699 }
 700
 701 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
 702 {
 703         return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
 704 }
 705
 706
 707 /* page.c */
 708 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
 709                              gfp_t gfp);
 710 int rds_page_copy_user(struct page *page, unsigned long offset,
 711                        void __user *ptr, unsigned long bytes,
 712                        int to_user);
 713 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
 714         rds_page_copy_user(page, offset, ptr, bytes, 1)
 715 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
 716         rds_page_copy_user(page, offset, ptr, bytes, 0)
 717 void rds_page_exit(void);
 718
 719 /* recv.c */
 720 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
 721                   __be32 saddr);
 722 void rds_inc_put(struct rds_incoming *inc);
 723 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
 724                        struct rds_incoming *inc, gfp_t gfp);
 725 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 726                 int msg_flags);
 727 void rds_clear_recv_queue(struct rds_sock *rs);
 728 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
 729 void rds_inc_info_copy(struct rds_incoming *inc,
 730                        struct rds_info_iterator *iter,
 731                        __be32 saddr, __be32 daddr, int flip);
 732
 733 /* send.c */
 734 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
 735 void rds_send_reset(struct rds_connection *conn);
 736 int rds_send_xmit(struct rds_connection *conn);
 737 struct sockaddr_in;
 738 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
 739 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
 740 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
 741                          is_acked_func is_acked);
 742 int rds_send_pong(struct rds_connection *conn, __be16 dport);
 743 struct rds_message *rds_send_get_message(struct rds_connection *,
 744                                          struct rm_rdma_op *);
 745
 746 /* rdma.c */
 747 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
 748 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
 749 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
 750 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
 751 void rds_rdma_drop_keys(struct rds_sock *rs);
 752 int rds_rdma_extra_size(struct rds_rdma_args *args);
 753 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
 754                           struct cmsghdr *cmsg);
 755 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
 756                           struct cmsghdr *cmsg);
 757 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
 758                           struct cmsghdr *cmsg);
 759 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
 760                           struct cmsghdr *cmsg);
 761 void rds_rdma_free_op(struct rm_rdma_op *ro);
 762 void rds_atomic_free_op(struct rm_atomic_op *ao);
 763 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
 764 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
 765 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
 766                     struct cmsghdr *cmsg);
 767
 768 void __rds_put_mr_final(struct rds_mr *mr);
 769 static inline void rds_mr_put(struct rds_mr *mr)
 770 {
 771         if (atomic_dec_and_test(&mr->r_refcount))
 772                 __rds_put_mr_final(mr);
 773 }
 774
 775 /* stats.c */
 776 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
 777 #define rds_stats_inc_which(which, member) do {         \
 778         per_cpu(which, get_cpu()).member++;             \
 779         put_cpu();                                      \
 780 } while (0)
 781 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
 782 #define rds_stats_add_which(which, member, count) do {          \
 783         per_cpu(which, get_cpu()).member += count;      \
 784         put_cpu();                                      \
 785 } while (0)
 786 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
 787 int rds_stats_init(void);
 788 void rds_stats_exit(void);
 789 void rds_stats_info_copy(struct rds_info_iterator *iter,
 790                          uint64_t *values, const char *const *names,
 791                          size_t nr);
 792
 793 /* sysctl.c */
 794 int rds_sysctl_init(void);
 795 void rds_sysctl_exit(void);
 796 extern unsigned long rds_sysctl_sndbuf_min;
 797 extern unsigned long rds_sysctl_sndbuf_default;
 798 extern unsigned long rds_sysctl_sndbuf_max;
 799 extern unsigned long rds_sysctl_reconnect_min_jiffies;
 800 extern unsigned long rds_sysctl_reconnect_max_jiffies;
 801 extern unsigned int  rds_sysctl_max_unacked_packets;
 802 extern unsigned int  rds_sysctl_max_unacked_bytes;
 803 extern unsigned int  rds_sysctl_ping_enable;
 804 extern unsigned long rds_sysctl_trace_flags;
 805 extern unsigned int  rds_sysctl_trace_level;
 806
 807 /* threads.c */
 808 int rds_threads_init(void);
 809 void rds_threads_exit(void);
 810 extern struct workqueue_struct *rds_wq;
 811 void rds_queue_reconnect(struct rds_connection *conn);
 812 void rds_connect_worker(struct work_struct *);
 813 void rds_shutdown_worker(struct work_struct *);
 814 void rds_send_worker(struct work_struct *);
 815 void rds_recv_worker(struct work_struct *);
 816 void rds_connect_complete(struct rds_connection *conn);
 817
 818 /* transport.c */
 819 int rds_trans_register(struct rds_transport *trans);
 820 void rds_trans_unregister(struct rds_transport *trans);
 821 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
 822 void rds_trans_put(struct rds_transport *trans);
 823 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
 824                                        unsigned int avail);
 825 struct rds_transport *rds_trans_get(int t_type);
 826 int rds_trans_init(void);
 827 void rds_trans_exit(void);
 828
 829 #endif