5 #include <linux/scatterlist.h>
6 #include <linux/highmem.h>
7 #include <rdma/rdma_cm.h>
8 #include <linux/mutex.h>
14 * RDS Network protocol version
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)
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.
29 #define RDS_PORT 18634
32 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
34 /* sigh, pr_debug() causes unused variable warnings */
35 static inline void __attribute__ ((format (printf
, 1, 2)))
36 rdsdebug(char *fmt
, ...)
41 /* XXX is there one of these somewhere? */
43 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
45 #define RDS_FRAG_SHIFT 12
46 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
48 #define RDS_CONG_MAP_BYTES (65536 / 8)
49 #define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long))
50 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
51 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
54 struct rb_node m_rb_node
;
56 wait_queue_head_t m_waitq
;
57 struct list_head m_conn_list
;
58 unsigned long m_page_addrs
[RDS_CONG_MAP_PAGES
];
63 * This is how we will track the connection state:
64 * A connection is always in one of the following
65 * states. Updates to the state are atomic and imply
71 RDS_CONN_DISCONNECTING
,
76 /* Bits for c_flags */
77 #define RDS_LL_SEND_FULL 0
78 #define RDS_RECONNECT_PENDING 1
80 struct rds_connection
{
81 struct hlist_node c_hash_node
;
84 unsigned int c_loopback
:1;
85 struct rds_connection
*c_passive
;
87 struct rds_cong_map
*c_lcong
;
88 struct rds_cong_map
*c_fcong
;
90 struct mutex c_send_lock
; /* protect send ring */
91 struct rds_message
*c_xmit_rm
;
92 unsigned long c_xmit_sg
;
93 unsigned int c_xmit_hdr_off
;
94 unsigned int c_xmit_data_off
;
95 unsigned int c_xmit_rdma_sent
;
97 spinlock_t c_lock
; /* protect msg queues */
99 struct list_head c_send_queue
;
100 struct list_head c_retrans
;
104 struct rds_transport
*c_trans
;
105 void *c_transport_data
;
108 unsigned long c_flags
;
109 unsigned long c_reconnect_jiffies
;
110 struct delayed_work c_send_w
;
111 struct delayed_work c_recv_w
;
112 struct delayed_work c_conn_w
;
113 struct work_struct c_down_w
;
114 struct mutex c_cm_lock
; /* protect conn state & cm */
116 struct list_head c_map_item
;
117 unsigned long c_map_queued
;
118 unsigned long c_map_offset
;
119 unsigned long c_map_bytes
;
121 unsigned int c_unacked_packets
;
122 unsigned int c_unacked_bytes
;
124 /* Protocol version */
125 unsigned int c_version
;
128 #define RDS_FLAG_CONG_BITMAP 0x01
129 #define RDS_FLAG_ACK_REQUIRED 0x02
130 #define RDS_FLAG_RETRANSMITTED 0x04
131 #define RDS_MAX_ADV_CREDIT 127
134 * Maximum space available for extension headers.
136 #define RDS_HEADER_EXT_SPACE 16
149 u8 h_exthdr
[RDS_HEADER_EXT_SPACE
];
153 * Reserved - indicates end of extensions
155 #define RDS_EXTHDR_NONE 0
158 * This extension header is included in the very
159 * first message that is sent on a new connection,
160 * and identifies the protocol level. This will help
161 * rolling updates if a future change requires breaking
163 * NB: This is no longer true for IB, where we do a version
164 * negotiation during the connection setup phase (protocol
165 * version information is included in the RDMA CM private data).
167 #define RDS_EXTHDR_VERSION 1
168 struct rds_ext_header_version
{
173 * This extension header is included in the RDS message
174 * chasing an RDMA operation.
176 #define RDS_EXTHDR_RDMA 2
177 struct rds_ext_header_rdma
{
182 * This extension header tells the peer about the
183 * destination <R_Key,offset> of the requested RDMA
186 #define RDS_EXTHDR_RDMA_DEST 3
187 struct rds_ext_header_rdma_dest
{
189 __be32 h_rdma_offset
;
192 #define __RDS_EXTHDR_MAX 16 /* for now */
194 struct rds_incoming
{
196 struct list_head i_item
;
197 struct rds_connection
*i_conn
;
198 struct rds_header i_hdr
;
199 unsigned long i_rx_jiffies
;
202 rds_rdma_cookie_t i_rdma_cookie
;
206 * m_sock_item and m_conn_item are on lists that are serialized under
207 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
208 * the message will not be put back on the retransmit list after being sent.
209 * messages that are canceled while being sent rely on this.
211 * m_inc is used by loopback so that it can pass an incoming message straight
212 * back up into the rx path. It embeds a wire header which is also used by
213 * the send path, which is kind of awkward.
215 * m_sock_item indicates the message's presence on a socket's send or receive
216 * queue. m_rs will point to that socket.
218 * m_daddr is used by cancellation to prune messages to a given destination.
220 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
221 * nesting. As paths iterate over messages on a sock, or conn, they must
222 * also lock the conn, or sock, to remove the message from those lists too.
223 * Testing the flag to determine if the message is still on the lists lets
224 * us avoid testing the list_head directly. That means each path can use
225 * the message's list_head to keep it on a local list while juggling locks
226 * without confusing the other path.
228 * m_ack_seq is an optional field set by transports who need a different
229 * sequence number range to invalidate. They can use this in a callback
230 * that they pass to rds_send_drop_acked() to see if each message has been
231 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
232 * had ack_seq set yet.
234 #define RDS_MSG_ON_SOCK 1
235 #define RDS_MSG_ON_CONN 2
236 #define RDS_MSG_HAS_ACK_SEQ 3
237 #define RDS_MSG_ACK_REQUIRED 4
238 #define RDS_MSG_RETRANSMITTED 5
239 #define RDS_MSG_MAPPED 6
240 #define RDS_MSG_PAGEVEC 7
244 struct list_head m_sock_item
;
245 struct list_head m_conn_item
;
246 struct rds_incoming m_inc
;
249 unsigned long m_flags
;
251 /* Never access m_rs without holding m_rs_lock.
256 spinlock_t m_rs_lock
;
257 struct rds_sock
*m_rs
;
258 struct rds_rdma_op
*m_rdma_op
;
259 rds_rdma_cookie_t m_rdma_cookie
;
260 struct rds_mr
*m_rdma_mr
;
261 unsigned int m_nents
;
262 unsigned int m_count
;
263 struct scatterlist m_sg
[0];
267 * The RDS notifier is used (optionally) to tell the application about
268 * completed RDMA operations. Rather than keeping the whole rds message
269 * around on the queue, we allocate a small notifier that is put on the
270 * socket's notifier_list. Notifications are delivered to the application
271 * through control messages.
273 struct rds_notifier
{
274 struct list_head n_list
;
275 uint64_t n_user_token
;
280 * struct rds_transport - transport specific behavioural hooks
282 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
283 * part of a message. The caller serializes on the send_sem so this
284 * doesn't need to be reentrant for a given conn. The header must be
285 * sent before the data payload. .xmit must be prepared to send a
286 * message with no data payload. .xmit should return the number of
287 * bytes that were sent down the connection, including header bytes.
288 * Returning 0 tells the caller that it doesn't need to perform any
289 * additional work now. This is usually the case when the transport has
290 * filled the sending queue for its connection and will handle
291 * triggering the rds thread to continue the send when space becomes
292 * available. Returning -EAGAIN tells the caller to retry the send
293 * immediately. Returning -ENOMEM tells the caller to retry the send at
294 * some point in the future.
296 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
297 * it returns the connection can not call rds_recv_incoming().
298 * This will only be called once after conn_connect returns
299 * non-zero success and will The caller serializes this with
300 * the send and connecting paths (xmit_* and conn_*). The
301 * transport is responsible for other serialization, including
302 * rds_recv_incoming(). This is called in process context but
303 * should try hard not to block.
305 * @xmit_cong_map: This asks the transport to send the local bitmap down the
306 * given connection. XXX get a better story about the bitmap
310 struct rds_transport
{
311 char t_name
[TRANSNAMSIZ
];
312 struct list_head t_item
;
313 struct module
*t_owner
;
314 unsigned int t_prefer_loopback
:1;
316 int (*laddr_check
)(__be32 addr
);
317 int (*conn_alloc
)(struct rds_connection
*conn
, gfp_t gfp
);
318 void (*conn_free
)(void *data
);
319 int (*conn_connect
)(struct rds_connection
*conn
);
320 void (*conn_shutdown
)(struct rds_connection
*conn
);
321 void (*xmit_prepare
)(struct rds_connection
*conn
);
322 void (*xmit_complete
)(struct rds_connection
*conn
);
323 int (*xmit
)(struct rds_connection
*conn
, struct rds_message
*rm
,
324 unsigned int hdr_off
, unsigned int sg
, unsigned int off
);
325 int (*xmit_cong_map
)(struct rds_connection
*conn
,
326 struct rds_cong_map
*map
, unsigned long offset
);
327 int (*xmit_rdma
)(struct rds_connection
*conn
, struct rds_rdma_op
*op
);
328 int (*recv
)(struct rds_connection
*conn
);
329 int (*inc_copy_to_user
)(struct rds_incoming
*inc
, struct iovec
*iov
,
331 void (*inc_purge
)(struct rds_incoming
*inc
);
332 void (*inc_free
)(struct rds_incoming
*inc
);
334 int (*cm_handle_connect
)(struct rdma_cm_id
*cm_id
,
335 struct rdma_cm_event
*event
);
336 int (*cm_initiate_connect
)(struct rdma_cm_id
*cm_id
);
337 void (*cm_connect_complete
)(struct rds_connection
*conn
,
338 struct rdma_cm_event
*event
);
340 unsigned int (*stats_info_copy
)(struct rds_info_iterator
*iter
,
343 void *(*get_mr
)(struct scatterlist
*sg
, unsigned long nr_sg
,
344 struct rds_sock
*rs
, u32
*key_ret
);
345 void (*sync_mr
)(void *trans_private
, int direction
);
346 void (*free_mr
)(void *trans_private
, int invalidate
);
347 void (*flush_mrs
)(void);
357 * bound_addr used for both incoming and outgoing, no INADDR_ANY
360 struct rb_node rs_bound_node
;
361 __be32 rs_bound_addr
;
363 __be16 rs_bound_port
;
367 * This is only used to communicate the transport between bind and
368 * initiating connections. All other trans use is referenced through
371 struct rds_transport
*rs_transport
;
374 * rds_sendmsg caches the conn it used the last time around.
375 * This helps avoid costly lookups.
377 struct rds_connection
*rs_conn
;
379 /* flag indicating we were congested or not */
382 /* rs_lock protects all these adjacent members before the newline */
384 struct list_head rs_send_queue
;
387 struct list_head rs_notify_queue
; /* currently used for failed RDMAs */
389 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
390 * to decide whether the application should be woken up.
391 * If not set, we use rs_cong_track to find out whether a cong map
394 uint64_t rs_cong_mask
;
395 uint64_t rs_cong_notify
;
396 struct list_head rs_cong_list
;
397 unsigned long rs_cong_track
;
400 * rs_recv_lock protects the receive queue, and is
401 * used to serialize with rds_release.
403 rwlock_t rs_recv_lock
;
404 struct list_head rs_recv_queue
;
406 /* just for stats reporting */
407 struct list_head rs_item
;
409 /* these have their own lock */
410 spinlock_t rs_rdma_lock
;
411 struct rb_root rs_rdma_keys
;
413 /* Socket options - in case there will be more */
414 unsigned char rs_recverr
,
418 static inline struct rds_sock
*rds_sk_to_rs(const struct sock
*sk
)
420 return container_of(sk
, struct rds_sock
, rs_sk
);
422 static inline struct sock
*rds_rs_to_sk(struct rds_sock
*rs
)
428 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
429 * to account for overhead. We don't account for overhead, we just apply
430 * the number of payload bytes to the specified value.
432 static inline int rds_sk_sndbuf(struct rds_sock
*rs
)
434 return rds_rs_to_sk(rs
)->sk_sndbuf
/ 2;
436 static inline int rds_sk_rcvbuf(struct rds_sock
*rs
)
438 return rds_rs_to_sk(rs
)->sk_rcvbuf
/ 2;
441 struct rds_statistics
{
442 uint64_t s_conn_reset
;
443 uint64_t s_recv_drop_bad_checksum
;
444 uint64_t s_recv_drop_old_seq
;
445 uint64_t s_recv_drop_no_sock
;
446 uint64_t s_recv_drop_dead_sock
;
447 uint64_t s_recv_deliver_raced
;
448 uint64_t s_recv_delivered
;
449 uint64_t s_recv_queued
;
450 uint64_t s_recv_immediate_retry
;
451 uint64_t s_recv_delayed_retry
;
452 uint64_t s_recv_ack_required
;
453 uint64_t s_recv_rdma_bytes
;
454 uint64_t s_recv_ping
;
455 uint64_t s_send_queue_empty
;
456 uint64_t s_send_queue_full
;
457 uint64_t s_send_sem_contention
;
458 uint64_t s_send_sem_queue_raced
;
459 uint64_t s_send_immediate_retry
;
460 uint64_t s_send_delayed_retry
;
461 uint64_t s_send_drop_acked
;
462 uint64_t s_send_ack_required
;
463 uint64_t s_send_queued
;
464 uint64_t s_send_rdma
;
465 uint64_t s_send_rdma_bytes
;
466 uint64_t s_send_pong
;
467 uint64_t s_page_remainder_hit
;
468 uint64_t s_page_remainder_miss
;
469 uint64_t s_copy_to_user
;
470 uint64_t s_copy_from_user
;
471 uint64_t s_cong_update_queued
;
472 uint64_t s_cong_update_received
;
473 uint64_t s_cong_send_error
;
474 uint64_t s_cong_send_blocked
;
478 void rds_sock_addref(struct rds_sock
*rs
);
479 void rds_sock_put(struct rds_sock
*rs
);
480 void rds_wake_sk_sleep(struct rds_sock
*rs
);
481 static inline void __rds_wake_sk_sleep(struct sock
*sk
)
483 wait_queue_head_t
*waitq
= sk
->sk_sleep
;
485 if (!sock_flag(sk
, SOCK_DEAD
) && waitq
)
488 extern wait_queue_head_t rds_poll_waitq
;
492 int rds_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
493 void rds_remove_bound(struct rds_sock
*rs
);
494 struct rds_sock
*rds_find_bound(__be32 addr
, __be16 port
);
497 int rds_cong_get_maps(struct rds_connection
*conn
);
498 void rds_cong_add_conn(struct rds_connection
*conn
);
499 void rds_cong_remove_conn(struct rds_connection
*conn
);
500 void rds_cong_set_bit(struct rds_cong_map
*map
, __be16 port
);
501 void rds_cong_clear_bit(struct rds_cong_map
*map
, __be16 port
);
502 int rds_cong_wait(struct rds_cong_map
*map
, __be16 port
, int nonblock
, struct rds_sock
*rs
);
503 void rds_cong_queue_updates(struct rds_cong_map
*map
);
504 void rds_cong_map_updated(struct rds_cong_map
*map
, uint64_t);
505 int rds_cong_updated_since(unsigned long *recent
);
506 void rds_cong_add_socket(struct rds_sock
*);
507 void rds_cong_remove_socket(struct rds_sock
*);
508 void rds_cong_exit(void);
509 struct rds_message
*rds_cong_update_alloc(struct rds_connection
*conn
);
512 int __init
rds_conn_init(void);
513 void rds_conn_exit(void);
514 struct rds_connection
*rds_conn_create(__be32 laddr
, __be32 faddr
,
515 struct rds_transport
*trans
, gfp_t gfp
);
516 struct rds_connection
*rds_conn_create_outgoing(__be32 laddr
, __be32 faddr
,
517 struct rds_transport
*trans
, gfp_t gfp
);
518 void rds_conn_destroy(struct rds_connection
*conn
);
519 void rds_conn_reset(struct rds_connection
*conn
);
520 void rds_conn_drop(struct rds_connection
*conn
);
521 void rds_for_each_conn_info(struct socket
*sock
, unsigned int len
,
522 struct rds_info_iterator
*iter
,
523 struct rds_info_lengths
*lens
,
524 int (*visitor
)(struct rds_connection
*, void *),
526 void __rds_conn_error(struct rds_connection
*conn
, const char *, ...)
527 __attribute__ ((format (printf
, 2, 3)));
528 #define rds_conn_error(conn, fmt...) \
529 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
532 rds_conn_transition(struct rds_connection
*conn
, int old
, int new)
534 return atomic_cmpxchg(&conn
->c_state
, old
, new) == old
;
538 rds_conn_state(struct rds_connection
*conn
)
540 return atomic_read(&conn
->c_state
);
544 rds_conn_up(struct rds_connection
*conn
)
546 return atomic_read(&conn
->c_state
) == RDS_CONN_UP
;
550 rds_conn_connecting(struct rds_connection
*conn
)
552 return atomic_read(&conn
->c_state
) == RDS_CONN_CONNECTING
;
556 struct rds_message
*rds_message_alloc(unsigned int nents
, gfp_t gfp
);
557 struct rds_message
*rds_message_copy_from_user(struct iovec
*first_iov
,
559 struct rds_message
*rds_message_map_pages(unsigned long *page_addrs
, unsigned int total_len
);
560 void rds_message_populate_header(struct rds_header
*hdr
, __be16 sport
,
561 __be16 dport
, u64 seq
);
562 int rds_message_add_extension(struct rds_header
*hdr
,
563 unsigned int type
, const void *data
, unsigned int len
);
564 int rds_message_next_extension(struct rds_header
*hdr
,
565 unsigned int *pos
, void *buf
, unsigned int *buflen
);
566 int rds_message_add_version_extension(struct rds_header
*hdr
, unsigned int version
);
567 int rds_message_get_version_extension(struct rds_header
*hdr
, unsigned int *version
);
568 int rds_message_add_rdma_dest_extension(struct rds_header
*hdr
, u32 r_key
, u32 offset
);
569 int rds_message_inc_copy_to_user(struct rds_incoming
*inc
,
570 struct iovec
*first_iov
, size_t size
);
571 void rds_message_inc_purge(struct rds_incoming
*inc
);
572 void rds_message_inc_free(struct rds_incoming
*inc
);
573 void rds_message_addref(struct rds_message
*rm
);
574 void rds_message_put(struct rds_message
*rm
);
575 void rds_message_wait(struct rds_message
*rm
);
576 void rds_message_unmapped(struct rds_message
*rm
);
578 static inline void rds_message_make_checksum(struct rds_header
*hdr
)
581 hdr
->h_csum
= ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2);
584 static inline int rds_message_verify_checksum(const struct rds_header
*hdr
)
586 return !hdr
->h_csum
|| ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2) == 0;
591 int rds_page_remainder_alloc(struct scatterlist
*scat
, unsigned long bytes
,
593 int rds_page_copy_user(struct page
*page
, unsigned long offset
,
594 void __user
*ptr
, unsigned long bytes
,
596 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
597 rds_page_copy_user(page, offset, ptr, bytes, 1)
598 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
599 rds_page_copy_user(page, offset, ptr, bytes, 0)
600 void rds_page_exit(void);
603 void rds_inc_init(struct rds_incoming
*inc
, struct rds_connection
*conn
,
605 void rds_inc_addref(struct rds_incoming
*inc
);
606 void rds_inc_put(struct rds_incoming
*inc
);
607 void rds_recv_incoming(struct rds_connection
*conn
, __be32 saddr
, __be32 daddr
,
608 struct rds_incoming
*inc
, gfp_t gfp
, enum km_type km
);
609 int rds_recvmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
610 size_t size
, int msg_flags
);
611 void rds_clear_recv_queue(struct rds_sock
*rs
);
612 int rds_notify_queue_get(struct rds_sock
*rs
, struct msghdr
*msg
);
613 void rds_inc_info_copy(struct rds_incoming
*inc
,
614 struct rds_info_iterator
*iter
,
615 __be32 saddr
, __be32 daddr
, int flip
);
618 int rds_sendmsg(struct kiocb
*iocb
, struct socket
*sock
, struct msghdr
*msg
,
620 void rds_send_reset(struct rds_connection
*conn
);
621 int rds_send_xmit(struct rds_connection
*conn
);
623 void rds_send_drop_to(struct rds_sock
*rs
, struct sockaddr_in
*dest
);
624 typedef int (*is_acked_func
)(struct rds_message
*rm
, uint64_t ack
);
625 void rds_send_drop_acked(struct rds_connection
*conn
, u64 ack
,
626 is_acked_func is_acked
);
627 int rds_send_acked_before(struct rds_connection
*conn
, u64 seq
);
628 void rds_send_remove_from_sock(struct list_head
*messages
, int status
);
629 int rds_send_pong(struct rds_connection
*conn
, __be16 dport
);
630 struct rds_message
*rds_send_get_message(struct rds_connection
*,
631 struct rds_rdma_op
*);
634 void rds_rdma_unuse(struct rds_sock
*rs
, u32 r_key
, int force
);
637 DECLARE_PER_CPU(struct rds_statistics
, rds_stats
);
638 #define rds_stats_inc_which(which, member) do { \
639 per_cpu(which, get_cpu()).member++; \
642 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
643 #define rds_stats_add_which(which, member, count) do { \
644 per_cpu(which, get_cpu()).member += count; \
647 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
648 int __init
rds_stats_init(void);
649 void rds_stats_exit(void);
650 void rds_stats_info_copy(struct rds_info_iterator
*iter
,
651 uint64_t *values
, char **names
, size_t nr
);
654 int __init
rds_sysctl_init(void);
655 void rds_sysctl_exit(void);
656 extern unsigned long rds_sysctl_sndbuf_min
;
657 extern unsigned long rds_sysctl_sndbuf_default
;
658 extern unsigned long rds_sysctl_sndbuf_max
;
659 extern unsigned long rds_sysctl_reconnect_min_jiffies
;
660 extern unsigned long rds_sysctl_reconnect_max_jiffies
;
661 extern unsigned int rds_sysctl_max_unacked_packets
;
662 extern unsigned int rds_sysctl_max_unacked_bytes
;
663 extern unsigned int rds_sysctl_ping_enable
;
664 extern unsigned long rds_sysctl_trace_flags
;
665 extern unsigned int rds_sysctl_trace_level
;
668 int __init
rds_threads_init(void);
669 void rds_threads_exit(void);
670 extern struct workqueue_struct
*rds_wq
;
671 void rds_connect_worker(struct work_struct
*);
672 void rds_shutdown_worker(struct work_struct
*);
673 void rds_send_worker(struct work_struct
*);
674 void rds_recv_worker(struct work_struct
*);
675 void rds_connect_complete(struct rds_connection
*conn
);
678 int rds_trans_register(struct rds_transport
*trans
);
679 void rds_trans_unregister(struct rds_transport
*trans
);
680 struct rds_transport
*rds_trans_get_preferred(__be32 addr
);
681 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator
*iter
,
683 int __init
rds_trans_init(void);
684 void rds_trans_exit(void);