5 #include <linux/scatterlist.h>
6 #include <linux/highmem.h>
7 #include <rdma/rdma_cm.h>
8 #include <linux/mutex.h>
10 #include <linux/rhashtable.h>
15 * RDS Network protocol version
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)
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.
30 #define RDS_PORT 18634
33 #define KERNEL_HAS_ATOMIC64
37 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
39 /* sigh, pr_debug() causes unused variable warnings */
40 static inline __printf(1, 2)
41 void rdsdebug(char *fmt
, ...)
46 /* XXX is there one of these somewhere? */
48 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
50 #define RDS_FRAG_SHIFT 12
51 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
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)
58 struct rb_node m_rb_node
;
60 wait_queue_head_t m_waitq
;
61 struct list_head m_conn_list
;
62 unsigned long m_page_addrs
[RDS_CONG_MAP_PAGES
];
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
75 RDS_CONN_DISCONNECTING
,
81 /* Bits for c_flags */
82 #define RDS_LL_SEND_FULL 0
83 #define RDS_RECONNECT_PENDING 1
85 #define RDS_RECV_REFILL 3
87 struct rds_connection
{
88 struct hlist_node c_hash_node
;
91 unsigned int c_loopback
:1,
94 struct rds_connection
*c_passive
;
96 struct rds_cong_map
*c_lcong
;
97 struct rds_cong_map
*c_fcong
;
99 struct rds_message
*c_xmit_rm
;
100 unsigned long c_xmit_sg
;
101 unsigned int c_xmit_hdr_off
;
102 unsigned int c_xmit_data_off
;
103 unsigned int c_xmit_atomic_sent
;
104 unsigned int c_xmit_rdma_sent
;
105 unsigned int c_xmit_data_sent
;
107 spinlock_t c_lock
; /* protect msg queues */
109 struct list_head c_send_queue
;
110 struct list_head c_retrans
;
114 struct rds_transport
*c_trans
;
115 void *c_transport_data
;
118 unsigned long c_send_gen
;
119 unsigned long c_flags
;
120 unsigned long c_reconnect_jiffies
;
121 struct delayed_work c_send_w
;
122 struct delayed_work c_recv_w
;
123 struct delayed_work c_conn_w
;
124 struct work_struct c_down_w
;
125 struct mutex c_cm_lock
; /* protect conn state & cm */
126 wait_queue_head_t c_waitq
;
128 struct list_head c_map_item
;
129 unsigned long c_map_queued
;
131 unsigned int c_unacked_packets
;
132 unsigned int c_unacked_bytes
;
134 /* Protocol version */
135 unsigned int c_version
;
136 possible_net_t c_net
;
140 struct net
*rds_conn_net(struct rds_connection
*conn
)
142 return read_pnet(&conn
->c_net
);
146 void rds_conn_net_set(struct rds_connection
*conn
, struct net
*net
)
148 write_pnet(&conn
->c_net
, net
);
151 #define RDS_FLAG_CONG_BITMAP 0x01
152 #define RDS_FLAG_ACK_REQUIRED 0x02
153 #define RDS_FLAG_RETRANSMITTED 0x04
154 #define RDS_MAX_ADV_CREDIT 255
157 * Maximum space available for extension headers.
159 #define RDS_HEADER_EXT_SPACE 16
172 u8 h_exthdr
[RDS_HEADER_EXT_SPACE
];
176 * Reserved - indicates end of extensions
178 #define RDS_EXTHDR_NONE 0
181 * This extension header is included in the very
182 * first message that is sent on a new connection,
183 * and identifies the protocol level. This will help
184 * rolling updates if a future change requires breaking
186 * NB: This is no longer true for IB, where we do a version
187 * negotiation during the connection setup phase (protocol
188 * version information is included in the RDMA CM private data).
190 #define RDS_EXTHDR_VERSION 1
191 struct rds_ext_header_version
{
196 * This extension header is included in the RDS message
197 * chasing an RDMA operation.
199 #define RDS_EXTHDR_RDMA 2
200 struct rds_ext_header_rdma
{
205 * This extension header tells the peer about the
206 * destination <R_Key,offset> of the requested RDMA
209 #define RDS_EXTHDR_RDMA_DEST 3
210 struct rds_ext_header_rdma_dest
{
212 __be32 h_rdma_offset
;
215 #define __RDS_EXTHDR_MAX 16 /* for now */
217 struct rds_incoming
{
219 struct list_head i_item
;
220 struct rds_connection
*i_conn
;
221 struct rds_header i_hdr
;
222 unsigned long i_rx_jiffies
;
225 rds_rdma_cookie_t i_rdma_cookie
;
226 struct timeval i_rx_tstamp
;
230 struct rb_node r_rb_node
;
234 /* A copy of the creation flags */
235 unsigned int r_use_once
:1;
236 unsigned int r_invalidate
:1;
237 unsigned int r_write
:1;
239 /* This is for RDS_MR_DEAD.
240 * It would be nice & consistent to make this part of the above
241 * bit field here, but we need to use test_and_set_bit.
243 unsigned long r_state
;
244 struct rds_sock
*r_sock
; /* back pointer to the socket that owns us */
245 struct rds_transport
*r_trans
;
246 void *r_trans_private
;
249 /* Flags for mr->r_state */
250 #define RDS_MR_DEAD 0
252 static inline rds_rdma_cookie_t
rds_rdma_make_cookie(u32 r_key
, u32 offset
)
254 return r_key
| (((u64
) offset
) << 32);
257 static inline u32
rds_rdma_cookie_key(rds_rdma_cookie_t cookie
)
262 static inline u32
rds_rdma_cookie_offset(rds_rdma_cookie_t cookie
)
267 /* atomic operation types */
268 #define RDS_ATOMIC_TYPE_CSWP 0
269 #define RDS_ATOMIC_TYPE_FADD 1
272 * m_sock_item and m_conn_item are on lists that are serialized under
273 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
274 * the message will not be put back on the retransmit list after being sent.
275 * messages that are canceled while being sent rely on this.
277 * m_inc is used by loopback so that it can pass an incoming message straight
278 * back up into the rx path. It embeds a wire header which is also used by
279 * the send path, which is kind of awkward.
281 * m_sock_item indicates the message's presence on a socket's send or receive
282 * queue. m_rs will point to that socket.
284 * m_daddr is used by cancellation to prune messages to a given destination.
286 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
287 * nesting. As paths iterate over messages on a sock, or conn, they must
288 * also lock the conn, or sock, to remove the message from those lists too.
289 * Testing the flag to determine if the message is still on the lists lets
290 * us avoid testing the list_head directly. That means each path can use
291 * the message's list_head to keep it on a local list while juggling locks
292 * without confusing the other path.
294 * m_ack_seq is an optional field set by transports who need a different
295 * sequence number range to invalidate. They can use this in a callback
296 * that they pass to rds_send_drop_acked() to see if each message has been
297 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
298 * had ack_seq set yet.
300 #define RDS_MSG_ON_SOCK 1
301 #define RDS_MSG_ON_CONN 2
302 #define RDS_MSG_HAS_ACK_SEQ 3
303 #define RDS_MSG_ACK_REQUIRED 4
304 #define RDS_MSG_RETRANSMITTED 5
305 #define RDS_MSG_MAPPED 6
306 #define RDS_MSG_PAGEVEC 7
310 struct list_head m_sock_item
;
311 struct list_head m_conn_item
;
312 struct rds_incoming m_inc
;
315 unsigned long m_flags
;
317 /* Never access m_rs without holding m_rs_lock.
322 spinlock_t m_rs_lock
;
323 wait_queue_head_t m_flush_wait
;
325 struct rds_sock
*m_rs
;
327 /* cookie to send to remote, in rds header */
328 rds_rdma_cookie_t m_rdma_cookie
;
330 unsigned int m_used_sgs
;
331 unsigned int m_total_sgs
;
336 struct rm_atomic_op
{
342 uint64_t compare_mask
;
347 uint64_t nocarry_mask
;
353 unsigned int op_notify
:1;
354 unsigned int op_recverr
:1;
355 unsigned int op_mapped
:1;
356 unsigned int op_silent
:1;
357 unsigned int op_active
:1;
358 struct scatterlist
*op_sg
;
359 struct rds_notifier
*op_notifier
;
361 struct rds_mr
*op_rdma_mr
;
366 unsigned int op_write
:1;
367 unsigned int op_fence
:1;
368 unsigned int op_notify
:1;
369 unsigned int op_recverr
:1;
370 unsigned int op_mapped
:1;
371 unsigned int op_silent
:1;
372 unsigned int op_active
:1;
373 unsigned int op_bytes
;
374 unsigned int op_nents
;
375 unsigned int op_count
;
376 struct scatterlist
*op_sg
;
377 struct rds_notifier
*op_notifier
;
379 struct rds_mr
*op_rdma_mr
;
382 unsigned int op_active
:1;
383 unsigned int op_nents
;
384 unsigned int op_count
;
385 unsigned int op_dmasg
;
386 unsigned int op_dmaoff
;
387 struct scatterlist
*op_sg
;
393 * The RDS notifier is used (optionally) to tell the application about
394 * completed RDMA operations. Rather than keeping the whole rds message
395 * around on the queue, we allocate a small notifier that is put on the
396 * socket's notifier_list. Notifications are delivered to the application
397 * through control messages.
399 struct rds_notifier
{
400 struct list_head n_list
;
401 uint64_t n_user_token
;
406 * struct rds_transport - transport specific behavioural hooks
408 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
409 * part of a message. The caller serializes on the send_sem so this
410 * doesn't need to be reentrant for a given conn. The header must be
411 * sent before the data payload. .xmit must be prepared to send a
412 * message with no data payload. .xmit should return the number of
413 * bytes that were sent down the connection, including header bytes.
414 * Returning 0 tells the caller that it doesn't need to perform any
415 * additional work now. This is usually the case when the transport has
416 * filled the sending queue for its connection and will handle
417 * triggering the rds thread to continue the send when space becomes
418 * available. Returning -EAGAIN tells the caller to retry the send
419 * immediately. Returning -ENOMEM tells the caller to retry the send at
420 * some point in the future.
422 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
423 * it returns the connection can not call rds_recv_incoming().
424 * This will only be called once after conn_connect returns
425 * non-zero success and will The caller serializes this with
426 * the send and connecting paths (xmit_* and conn_*). The
427 * transport is responsible for other serialization, including
428 * rds_recv_incoming(). This is called in process context but
429 * should try hard not to block.
432 struct rds_transport
{
433 char t_name
[TRANSNAMSIZ
];
434 struct list_head t_item
;
435 struct module
*t_owner
;
436 unsigned int t_prefer_loopback
:1;
439 int (*laddr_check
)(struct net
*net
, __be32 addr
);
440 int (*conn_alloc
)(struct rds_connection
*conn
, gfp_t gfp
);
441 void (*conn_free
)(void *data
);
442 int (*conn_connect
)(struct rds_connection
*conn
);
443 void (*conn_shutdown
)(struct rds_connection
*conn
);
444 void (*xmit_prepare
)(struct rds_connection
*conn
);
445 void (*xmit_complete
)(struct rds_connection
*conn
);
446 int (*xmit
)(struct rds_connection
*conn
, struct rds_message
*rm
,
447 unsigned int hdr_off
, unsigned int sg
, unsigned int off
);
448 int (*xmit_rdma
)(struct rds_connection
*conn
, struct rm_rdma_op
*op
);
449 int (*xmit_atomic
)(struct rds_connection
*conn
, struct rm_atomic_op
*op
);
450 int (*recv
)(struct rds_connection
*conn
);
451 int (*inc_copy_to_user
)(struct rds_incoming
*inc
, struct iov_iter
*to
);
452 void (*inc_free
)(struct rds_incoming
*inc
);
454 int (*cm_handle_connect
)(struct rdma_cm_id
*cm_id
,
455 struct rdma_cm_event
*event
);
456 int (*cm_initiate_connect
)(struct rdma_cm_id
*cm_id
);
457 void (*cm_connect_complete
)(struct rds_connection
*conn
,
458 struct rdma_cm_event
*event
);
460 unsigned int (*stats_info_copy
)(struct rds_info_iterator
*iter
,
463 void *(*get_mr
)(struct scatterlist
*sg
, unsigned long nr_sg
,
464 struct rds_sock
*rs
, u32
*key_ret
);
465 void (*sync_mr
)(void *trans_private
, int direction
);
466 void (*free_mr
)(void *trans_private
, int invalidate
);
467 void (*flush_mrs
)(void);
477 * bound_addr used for both incoming and outgoing, no INADDR_ANY
480 struct rhash_head rs_bound_node
;
482 __be32 rs_bound_addr
;
484 __be16 rs_bound_port
;
486 struct rds_transport
*rs_transport
;
489 * rds_sendmsg caches the conn it used the last time around.
490 * This helps avoid costly lookups.
492 struct rds_connection
*rs_conn
;
494 /* flag indicating we were congested or not */
496 /* seen congestion (ENOBUFS) when sending? */
497 int rs_seen_congestion
;
499 /* rs_lock protects all these adjacent members before the newline */
501 struct list_head rs_send_queue
;
504 struct list_head rs_notify_queue
; /* currently used for failed RDMAs */
506 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
507 * to decide whether the application should be woken up.
508 * If not set, we use rs_cong_track to find out whether a cong map
511 uint64_t rs_cong_mask
;
512 uint64_t rs_cong_notify
;
513 struct list_head rs_cong_list
;
514 unsigned long rs_cong_track
;
517 * rs_recv_lock protects the receive queue, and is
518 * used to serialize with rds_release.
520 rwlock_t rs_recv_lock
;
521 struct list_head rs_recv_queue
;
523 /* just for stats reporting */
524 struct list_head rs_item
;
526 /* these have their own lock */
527 spinlock_t rs_rdma_lock
;
528 struct rb_root rs_rdma_keys
;
530 /* Socket options - in case there will be more */
531 unsigned char rs_recverr
,
535 static inline struct rds_sock
*rds_sk_to_rs(const struct sock
*sk
)
537 return container_of(sk
, struct rds_sock
, rs_sk
);
539 static inline struct sock
*rds_rs_to_sk(struct rds_sock
*rs
)
545 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
546 * to account for overhead. We don't account for overhead, we just apply
547 * the number of payload bytes to the specified value.
549 static inline int rds_sk_sndbuf(struct rds_sock
*rs
)
551 return rds_rs_to_sk(rs
)->sk_sndbuf
/ 2;
553 static inline int rds_sk_rcvbuf(struct rds_sock
*rs
)
555 return rds_rs_to_sk(rs
)->sk_rcvbuf
/ 2;
558 struct rds_statistics
{
559 uint64_t s_conn_reset
;
560 uint64_t s_recv_drop_bad_checksum
;
561 uint64_t s_recv_drop_old_seq
;
562 uint64_t s_recv_drop_no_sock
;
563 uint64_t s_recv_drop_dead_sock
;
564 uint64_t s_recv_deliver_raced
;
565 uint64_t s_recv_delivered
;
566 uint64_t s_recv_queued
;
567 uint64_t s_recv_immediate_retry
;
568 uint64_t s_recv_delayed_retry
;
569 uint64_t s_recv_ack_required
;
570 uint64_t s_recv_rdma_bytes
;
571 uint64_t s_recv_ping
;
572 uint64_t s_send_queue_empty
;
573 uint64_t s_send_queue_full
;
574 uint64_t s_send_lock_contention
;
575 uint64_t s_send_lock_queue_raced
;
576 uint64_t s_send_immediate_retry
;
577 uint64_t s_send_delayed_retry
;
578 uint64_t s_send_drop_acked
;
579 uint64_t s_send_ack_required
;
580 uint64_t s_send_queued
;
581 uint64_t s_send_rdma
;
582 uint64_t s_send_rdma_bytes
;
583 uint64_t s_send_pong
;
584 uint64_t s_page_remainder_hit
;
585 uint64_t s_page_remainder_miss
;
586 uint64_t s_copy_to_user
;
587 uint64_t s_copy_from_user
;
588 uint64_t s_cong_update_queued
;
589 uint64_t s_cong_update_received
;
590 uint64_t s_cong_send_error
;
591 uint64_t s_cong_send_blocked
;
595 void rds_sock_addref(struct rds_sock
*rs
);
596 void rds_sock_put(struct rds_sock
*rs
);
597 void rds_wake_sk_sleep(struct rds_sock
*rs
);
598 static inline void __rds_wake_sk_sleep(struct sock
*sk
)
600 wait_queue_head_t
*waitq
= sk_sleep(sk
);
602 if (!sock_flag(sk
, SOCK_DEAD
) && waitq
)
605 extern wait_queue_head_t rds_poll_waitq
;
609 int rds_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
610 void rds_remove_bound(struct rds_sock
*rs
);
611 struct rds_sock
*rds_find_bound(__be32 addr
, __be16 port
);
612 int rds_bind_lock_init(void);
613 void rds_bind_lock_destroy(void);
616 int rds_cong_get_maps(struct rds_connection
*conn
);
617 void rds_cong_add_conn(struct rds_connection
*conn
);
618 void rds_cong_remove_conn(struct rds_connection
*conn
);
619 void rds_cong_set_bit(struct rds_cong_map
*map
, __be16 port
);
620 void rds_cong_clear_bit(struct rds_cong_map
*map
, __be16 port
);
621 int rds_cong_wait(struct rds_cong_map
*map
, __be16 port
, int nonblock
, struct rds_sock
*rs
);
622 void rds_cong_queue_updates(struct rds_cong_map
*map
);
623 void rds_cong_map_updated(struct rds_cong_map
*map
, uint64_t);
624 int rds_cong_updated_since(unsigned long *recent
);
625 void rds_cong_add_socket(struct rds_sock
*);
626 void rds_cong_remove_socket(struct rds_sock
*);
627 void rds_cong_exit(void);
628 struct rds_message
*rds_cong_update_alloc(struct rds_connection
*conn
);
631 int rds_conn_init(void);
632 void rds_conn_exit(void);
633 struct rds_connection
*rds_conn_create(struct net
*net
,
634 __be32 laddr
, __be32 faddr
,
635 struct rds_transport
*trans
, gfp_t gfp
);
636 struct rds_connection
*rds_conn_create_outgoing(struct net
*net
,
637 __be32 laddr
, __be32 faddr
,
638 struct rds_transport
*trans
, gfp_t gfp
);
639 void rds_conn_shutdown(struct rds_connection
*conn
);
640 void rds_conn_destroy(struct rds_connection
*conn
);
641 void rds_conn_drop(struct rds_connection
*conn
);
642 void rds_conn_connect_if_down(struct rds_connection
*conn
);
643 void rds_for_each_conn_info(struct socket
*sock
, unsigned int len
,
644 struct rds_info_iterator
*iter
,
645 struct rds_info_lengths
*lens
,
646 int (*visitor
)(struct rds_connection
*, void *),
649 void __rds_conn_error(struct rds_connection
*conn
, const char *, ...);
650 #define rds_conn_error(conn, fmt...) \
651 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
654 rds_conn_transition(struct rds_connection
*conn
, int old
, int new)
656 return atomic_cmpxchg(&conn
->c_state
, old
, new) == old
;
660 rds_conn_state(struct rds_connection
*conn
)
662 return atomic_read(&conn
->c_state
);
666 rds_conn_up(struct rds_connection
*conn
)
668 return atomic_read(&conn
->c_state
) == RDS_CONN_UP
;
672 rds_conn_connecting(struct rds_connection
*conn
)
674 return atomic_read(&conn
->c_state
) == RDS_CONN_CONNECTING
;
678 struct rds_message
*rds_message_alloc(unsigned int nents
, gfp_t gfp
);
679 struct scatterlist
*rds_message_alloc_sgs(struct rds_message
*rm
, int nents
);
680 int rds_message_copy_from_user(struct rds_message
*rm
, struct iov_iter
*from
);
681 struct rds_message
*rds_message_map_pages(unsigned long *page_addrs
, unsigned int total_len
);
682 void rds_message_populate_header(struct rds_header
*hdr
, __be16 sport
,
683 __be16 dport
, u64 seq
);
684 int rds_message_add_extension(struct rds_header
*hdr
,
685 unsigned int type
, const void *data
, unsigned int len
);
686 int rds_message_next_extension(struct rds_header
*hdr
,
687 unsigned int *pos
, void *buf
, unsigned int *buflen
);
688 int rds_message_add_rdma_dest_extension(struct rds_header
*hdr
, u32 r_key
, u32 offset
);
689 int rds_message_inc_copy_to_user(struct rds_incoming
*inc
, struct iov_iter
*to
);
690 void rds_message_inc_free(struct rds_incoming
*inc
);
691 void rds_message_addref(struct rds_message
*rm
);
692 void rds_message_put(struct rds_message
*rm
);
693 void rds_message_wait(struct rds_message
*rm
);
694 void rds_message_unmapped(struct rds_message
*rm
);
696 static inline void rds_message_make_checksum(struct rds_header
*hdr
)
699 hdr
->h_csum
= ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2);
702 static inline int rds_message_verify_checksum(const struct rds_header
*hdr
)
704 return !hdr
->h_csum
|| ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2) == 0;
709 int rds_page_remainder_alloc(struct scatterlist
*scat
, unsigned long bytes
,
711 int rds_page_copy_user(struct page
*page
, unsigned long offset
,
712 void __user
*ptr
, unsigned long bytes
,
714 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
715 rds_page_copy_user(page, offset, ptr, bytes, 1)
716 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
717 rds_page_copy_user(page, offset, ptr, bytes, 0)
718 void rds_page_exit(void);
721 void rds_inc_init(struct rds_incoming
*inc
, struct rds_connection
*conn
,
723 void rds_inc_put(struct rds_incoming
*inc
);
724 void rds_recv_incoming(struct rds_connection
*conn
, __be32 saddr
, __be32 daddr
,
725 struct rds_incoming
*inc
, gfp_t gfp
);
726 int rds_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
728 void rds_clear_recv_queue(struct rds_sock
*rs
);
729 int rds_notify_queue_get(struct rds_sock
*rs
, struct msghdr
*msg
);
730 void rds_inc_info_copy(struct rds_incoming
*inc
,
731 struct rds_info_iterator
*iter
,
732 __be32 saddr
, __be32 daddr
, int flip
);
735 int rds_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t payload_len
);
736 void rds_send_reset(struct rds_connection
*conn
);
737 int rds_send_xmit(struct rds_connection
*conn
);
739 void rds_send_drop_to(struct rds_sock
*rs
, struct sockaddr_in
*dest
);
740 typedef int (*is_acked_func
)(struct rds_message
*rm
, uint64_t ack
);
741 void rds_send_drop_acked(struct rds_connection
*conn
, u64 ack
,
742 is_acked_func is_acked
);
743 int rds_send_pong(struct rds_connection
*conn
, __be16 dport
);
744 struct rds_message
*rds_send_get_message(struct rds_connection
*,
745 struct rm_rdma_op
*);
748 void rds_rdma_unuse(struct rds_sock
*rs
, u32 r_key
, int force
);
749 int rds_get_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
750 int rds_get_mr_for_dest(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
751 int rds_free_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
752 void rds_rdma_drop_keys(struct rds_sock
*rs
);
753 int rds_rdma_extra_size(struct rds_rdma_args
*args
);
754 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
755 struct cmsghdr
*cmsg
);
756 int rds_cmsg_rdma_dest(struct rds_sock
*rs
, struct rds_message
*rm
,
757 struct cmsghdr
*cmsg
);
758 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
759 struct cmsghdr
*cmsg
);
760 int rds_cmsg_rdma_map(struct rds_sock
*rs
, struct rds_message
*rm
,
761 struct cmsghdr
*cmsg
);
762 void rds_rdma_free_op(struct rm_rdma_op
*ro
);
763 void rds_atomic_free_op(struct rm_atomic_op
*ao
);
764 void rds_rdma_send_complete(struct rds_message
*rm
, int wc_status
);
765 void rds_atomic_send_complete(struct rds_message
*rm
, int wc_status
);
766 int rds_cmsg_atomic(struct rds_sock
*rs
, struct rds_message
*rm
,
767 struct cmsghdr
*cmsg
);
769 void __rds_put_mr_final(struct rds_mr
*mr
);
770 static inline void rds_mr_put(struct rds_mr
*mr
)
772 if (atomic_dec_and_test(&mr
->r_refcount
))
773 __rds_put_mr_final(mr
);
777 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics
, rds_stats
);
778 #define rds_stats_inc_which(which, member) do { \
779 per_cpu(which, get_cpu()).member++; \
782 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
783 #define rds_stats_add_which(which, member, count) do { \
784 per_cpu(which, get_cpu()).member += count; \
787 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
788 int rds_stats_init(void);
789 void rds_stats_exit(void);
790 void rds_stats_info_copy(struct rds_info_iterator
*iter
,
791 uint64_t *values
, const char *const *names
,
795 int rds_sysctl_init(void);
796 void rds_sysctl_exit(void);
797 extern unsigned long rds_sysctl_sndbuf_min
;
798 extern unsigned long rds_sysctl_sndbuf_default
;
799 extern unsigned long rds_sysctl_sndbuf_max
;
800 extern unsigned long rds_sysctl_reconnect_min_jiffies
;
801 extern unsigned long rds_sysctl_reconnect_max_jiffies
;
802 extern unsigned int rds_sysctl_max_unacked_packets
;
803 extern unsigned int rds_sysctl_max_unacked_bytes
;
804 extern unsigned int rds_sysctl_ping_enable
;
805 extern unsigned long rds_sysctl_trace_flags
;
806 extern unsigned int rds_sysctl_trace_level
;
809 int rds_threads_init(void);
810 void rds_threads_exit(void);
811 extern struct workqueue_struct
*rds_wq
;
812 void rds_queue_reconnect(struct rds_connection
*conn
);
813 void rds_connect_worker(struct work_struct
*);
814 void rds_shutdown_worker(struct work_struct
*);
815 void rds_send_worker(struct work_struct
*);
816 void rds_recv_worker(struct work_struct
*);
817 void rds_connect_path_complete(struct rds_connection
*conn
, int curr
);
818 void rds_connect_complete(struct rds_connection
*conn
);
821 int rds_trans_register(struct rds_transport
*trans
);
822 void rds_trans_unregister(struct rds_transport
*trans
);
823 struct rds_transport
*rds_trans_get_preferred(struct net
*net
, __be32 addr
);
824 void rds_trans_put(struct rds_transport
*trans
);
825 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator
*iter
,
827 struct rds_transport
*rds_trans_get(int t_type
);
828 int rds_trans_init(void);
829 void rds_trans_exit(void);