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 /* Max number of multipaths per RDS connection. Must be a power of 2 */
88 #define RDS_MPATH_WORKERS 1
90 /* Per mpath connection state */
91 struct rds_conn_path
{
92 struct rds_connection
*cp_conn
;
93 struct rds_message
*cp_xmit_rm
;
94 unsigned long cp_xmit_sg
;
95 unsigned int cp_xmit_hdr_off
;
96 unsigned int cp_xmit_data_off
;
97 unsigned int cp_xmit_atomic_sent
;
98 unsigned int cp_xmit_rdma_sent
;
99 unsigned int cp_xmit_data_sent
;
101 spinlock_t cp_lock
; /* protect msg queues */
103 struct list_head cp_send_queue
;
104 struct list_head cp_retrans
;
108 void *cp_transport_data
;
111 unsigned long cp_send_gen
;
112 unsigned long cp_flags
;
113 unsigned long cp_reconnect_jiffies
;
114 struct delayed_work cp_send_w
;
115 struct delayed_work cp_recv_w
;
116 struct delayed_work cp_conn_w
;
117 struct work_struct cp_down_w
;
118 struct mutex cp_cm_lock
; /* protect cp_state & cm */
119 wait_queue_head_t cp_waitq
;
121 unsigned int cp_unacked_packets
;
122 unsigned int cp_unacked_bytes
;
123 unsigned int cp_outgoing
:1,
125 unsigned int cp_index
;
128 /* One rds_connection per RDS address pair */
129 struct rds_connection
{
130 struct hlist_node c_hash_node
;
133 unsigned int c_loopback
:1,
136 struct rds_connection
*c_passive
;
137 struct rds_transport
*c_trans
;
139 struct rds_cong_map
*c_lcong
;
140 struct rds_cong_map
*c_fcong
;
142 /* Protocol version */
143 unsigned int c_version
;
144 possible_net_t c_net
;
146 struct list_head c_map_item
;
147 unsigned long c_map_queued
;
149 struct rds_conn_path c_path
[RDS_MPATH_WORKERS
];
153 struct net
*rds_conn_net(struct rds_connection
*conn
)
155 return read_pnet(&conn
->c_net
);
159 void rds_conn_net_set(struct rds_connection
*conn
, struct net
*net
)
161 write_pnet(&conn
->c_net
, net
);
164 #define RDS_FLAG_CONG_BITMAP 0x01
165 #define RDS_FLAG_ACK_REQUIRED 0x02
166 #define RDS_FLAG_RETRANSMITTED 0x04
167 #define RDS_MAX_ADV_CREDIT 255
170 * Maximum space available for extension headers.
172 #define RDS_HEADER_EXT_SPACE 16
185 u8 h_exthdr
[RDS_HEADER_EXT_SPACE
];
189 * Reserved - indicates end of extensions
191 #define RDS_EXTHDR_NONE 0
194 * This extension header is included in the very
195 * first message that is sent on a new connection,
196 * and identifies the protocol level. This will help
197 * rolling updates if a future change requires breaking
199 * NB: This is no longer true for IB, where we do a version
200 * negotiation during the connection setup phase (protocol
201 * version information is included in the RDMA CM private data).
203 #define RDS_EXTHDR_VERSION 1
204 struct rds_ext_header_version
{
209 * This extension header is included in the RDS message
210 * chasing an RDMA operation.
212 #define RDS_EXTHDR_RDMA 2
213 struct rds_ext_header_rdma
{
218 * This extension header tells the peer about the
219 * destination <R_Key,offset> of the requested RDMA
222 #define RDS_EXTHDR_RDMA_DEST 3
223 struct rds_ext_header_rdma_dest
{
225 __be32 h_rdma_offset
;
228 #define __RDS_EXTHDR_MAX 16 /* for now */
230 struct rds_incoming
{
232 struct list_head i_item
;
233 struct rds_connection
*i_conn
;
234 struct rds_conn_path
*i_conn_path
;
235 struct rds_header i_hdr
;
236 unsigned long i_rx_jiffies
;
239 rds_rdma_cookie_t i_rdma_cookie
;
240 struct timeval i_rx_tstamp
;
244 struct rb_node r_rb_node
;
248 /* A copy of the creation flags */
249 unsigned int r_use_once
:1;
250 unsigned int r_invalidate
:1;
251 unsigned int r_write
:1;
253 /* This is for RDS_MR_DEAD.
254 * It would be nice & consistent to make this part of the above
255 * bit field here, but we need to use test_and_set_bit.
257 unsigned long r_state
;
258 struct rds_sock
*r_sock
; /* back pointer to the socket that owns us */
259 struct rds_transport
*r_trans
;
260 void *r_trans_private
;
263 /* Flags for mr->r_state */
264 #define RDS_MR_DEAD 0
266 static inline rds_rdma_cookie_t
rds_rdma_make_cookie(u32 r_key
, u32 offset
)
268 return r_key
| (((u64
) offset
) << 32);
271 static inline u32
rds_rdma_cookie_key(rds_rdma_cookie_t cookie
)
276 static inline u32
rds_rdma_cookie_offset(rds_rdma_cookie_t cookie
)
281 /* atomic operation types */
282 #define RDS_ATOMIC_TYPE_CSWP 0
283 #define RDS_ATOMIC_TYPE_FADD 1
286 * m_sock_item and m_conn_item are on lists that are serialized under
287 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
288 * the message will not be put back on the retransmit list after being sent.
289 * messages that are canceled while being sent rely on this.
291 * m_inc is used by loopback so that it can pass an incoming message straight
292 * back up into the rx path. It embeds a wire header which is also used by
293 * the send path, which is kind of awkward.
295 * m_sock_item indicates the message's presence on a socket's send or receive
296 * queue. m_rs will point to that socket.
298 * m_daddr is used by cancellation to prune messages to a given destination.
300 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
301 * nesting. As paths iterate over messages on a sock, or conn, they must
302 * also lock the conn, or sock, to remove the message from those lists too.
303 * Testing the flag to determine if the message is still on the lists lets
304 * us avoid testing the list_head directly. That means each path can use
305 * the message's list_head to keep it on a local list while juggling locks
306 * without confusing the other path.
308 * m_ack_seq is an optional field set by transports who need a different
309 * sequence number range to invalidate. They can use this in a callback
310 * that they pass to rds_send_drop_acked() to see if each message has been
311 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
312 * had ack_seq set yet.
314 #define RDS_MSG_ON_SOCK 1
315 #define RDS_MSG_ON_CONN 2
316 #define RDS_MSG_HAS_ACK_SEQ 3
317 #define RDS_MSG_ACK_REQUIRED 4
318 #define RDS_MSG_RETRANSMITTED 5
319 #define RDS_MSG_MAPPED 6
320 #define RDS_MSG_PAGEVEC 7
324 struct list_head m_sock_item
;
325 struct list_head m_conn_item
;
326 struct rds_incoming m_inc
;
329 unsigned long m_flags
;
331 /* Never access m_rs without holding m_rs_lock.
336 spinlock_t m_rs_lock
;
337 wait_queue_head_t m_flush_wait
;
339 struct rds_sock
*m_rs
;
341 /* cookie to send to remote, in rds header */
342 rds_rdma_cookie_t m_rdma_cookie
;
344 unsigned int m_used_sgs
;
345 unsigned int m_total_sgs
;
350 struct rm_atomic_op
{
356 uint64_t compare_mask
;
361 uint64_t nocarry_mask
;
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 struct scatterlist
*op_sg
;
373 struct rds_notifier
*op_notifier
;
375 struct rds_mr
*op_rdma_mr
;
380 unsigned int op_write
:1;
381 unsigned int op_fence
:1;
382 unsigned int op_notify
:1;
383 unsigned int op_recverr
:1;
384 unsigned int op_mapped
:1;
385 unsigned int op_silent
:1;
386 unsigned int op_active
:1;
387 unsigned int op_bytes
;
388 unsigned int op_nents
;
389 unsigned int op_count
;
390 struct scatterlist
*op_sg
;
391 struct rds_notifier
*op_notifier
;
393 struct rds_mr
*op_rdma_mr
;
396 unsigned int op_active
:1;
397 unsigned int op_nents
;
398 unsigned int op_count
;
399 unsigned int op_dmasg
;
400 unsigned int op_dmaoff
;
401 struct scatterlist
*op_sg
;
407 * The RDS notifier is used (optionally) to tell the application about
408 * completed RDMA operations. Rather than keeping the whole rds message
409 * around on the queue, we allocate a small notifier that is put on the
410 * socket's notifier_list. Notifications are delivered to the application
411 * through control messages.
413 struct rds_notifier
{
414 struct list_head n_list
;
415 uint64_t n_user_token
;
420 * struct rds_transport - transport specific behavioural hooks
422 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
423 * part of a message. The caller serializes on the send_sem so this
424 * doesn't need to be reentrant for a given conn. The header must be
425 * sent before the data payload. .xmit must be prepared to send a
426 * message with no data payload. .xmit should return the number of
427 * bytes that were sent down the connection, including header bytes.
428 * Returning 0 tells the caller that it doesn't need to perform any
429 * additional work now. This is usually the case when the transport has
430 * filled the sending queue for its connection and will handle
431 * triggering the rds thread to continue the send when space becomes
432 * available. Returning -EAGAIN tells the caller to retry the send
433 * immediately. Returning -ENOMEM tells the caller to retry the send at
434 * some point in the future.
436 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
437 * it returns the connection can not call rds_recv_incoming().
438 * This will only be called once after conn_connect returns
439 * non-zero success and will The caller serializes this with
440 * the send and connecting paths (xmit_* and conn_*). The
441 * transport is responsible for other serialization, including
442 * rds_recv_incoming(). This is called in process context but
443 * should try hard not to block.
446 struct rds_transport
{
447 char t_name
[TRANSNAMSIZ
];
448 struct list_head t_item
;
449 struct module
*t_owner
;
450 unsigned int t_prefer_loopback
:1,
454 int (*laddr_check
)(struct net
*net
, __be32 addr
);
455 int (*conn_alloc
)(struct rds_connection
*conn
, gfp_t gfp
);
456 void (*conn_free
)(void *data
);
457 int (*conn_connect
)(struct rds_connection
*conn
);
458 void (*conn_shutdown
)(struct rds_connection
*conn
);
459 void (*xmit_prepare
)(struct rds_connection
*conn
);
460 void (*xmit_path_prepare
)(struct rds_conn_path
*cp
);
461 void (*xmit_complete
)(struct rds_connection
*conn
);
462 void (*xmit_path_complete
)(struct rds_conn_path
*cp
);
463 int (*xmit
)(struct rds_connection
*conn
, struct rds_message
*rm
,
464 unsigned int hdr_off
, unsigned int sg
, unsigned int off
);
465 int (*xmit_rdma
)(struct rds_connection
*conn
, struct rm_rdma_op
*op
);
466 int (*xmit_atomic
)(struct rds_connection
*conn
, struct rm_atomic_op
*op
);
467 int (*recv
)(struct rds_connection
*conn
);
468 int (*inc_copy_to_user
)(struct rds_incoming
*inc
, struct iov_iter
*to
);
469 void (*inc_free
)(struct rds_incoming
*inc
);
471 int (*cm_handle_connect
)(struct rdma_cm_id
*cm_id
,
472 struct rdma_cm_event
*event
);
473 int (*cm_initiate_connect
)(struct rdma_cm_id
*cm_id
);
474 void (*cm_connect_complete
)(struct rds_connection
*conn
,
475 struct rdma_cm_event
*event
);
477 unsigned int (*stats_info_copy
)(struct rds_info_iterator
*iter
,
480 void *(*get_mr
)(struct scatterlist
*sg
, unsigned long nr_sg
,
481 struct rds_sock
*rs
, u32
*key_ret
);
482 void (*sync_mr
)(void *trans_private
, int direction
);
483 void (*free_mr
)(void *trans_private
, int invalidate
);
484 void (*flush_mrs
)(void);
494 * bound_addr used for both incoming and outgoing, no INADDR_ANY
497 struct rhash_head rs_bound_node
;
499 __be32 rs_bound_addr
;
501 __be16 rs_bound_port
;
503 struct rds_transport
*rs_transport
;
506 * rds_sendmsg caches the conn it used the last time around.
507 * This helps avoid costly lookups.
509 struct rds_connection
*rs_conn
;
511 /* flag indicating we were congested or not */
513 /* seen congestion (ENOBUFS) when sending? */
514 int rs_seen_congestion
;
516 /* rs_lock protects all these adjacent members before the newline */
518 struct list_head rs_send_queue
;
521 struct list_head rs_notify_queue
; /* currently used for failed RDMAs */
523 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
524 * to decide whether the application should be woken up.
525 * If not set, we use rs_cong_track to find out whether a cong map
528 uint64_t rs_cong_mask
;
529 uint64_t rs_cong_notify
;
530 struct list_head rs_cong_list
;
531 unsigned long rs_cong_track
;
534 * rs_recv_lock protects the receive queue, and is
535 * used to serialize with rds_release.
537 rwlock_t rs_recv_lock
;
538 struct list_head rs_recv_queue
;
540 /* just for stats reporting */
541 struct list_head rs_item
;
543 /* these have their own lock */
544 spinlock_t rs_rdma_lock
;
545 struct rb_root rs_rdma_keys
;
547 /* Socket options - in case there will be more */
548 unsigned char rs_recverr
,
552 static inline struct rds_sock
*rds_sk_to_rs(const struct sock
*sk
)
554 return container_of(sk
, struct rds_sock
, rs_sk
);
556 static inline struct sock
*rds_rs_to_sk(struct rds_sock
*rs
)
562 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
563 * to account for overhead. We don't account for overhead, we just apply
564 * the number of payload bytes to the specified value.
566 static inline int rds_sk_sndbuf(struct rds_sock
*rs
)
568 return rds_rs_to_sk(rs
)->sk_sndbuf
/ 2;
570 static inline int rds_sk_rcvbuf(struct rds_sock
*rs
)
572 return rds_rs_to_sk(rs
)->sk_rcvbuf
/ 2;
575 struct rds_statistics
{
576 uint64_t s_conn_reset
;
577 uint64_t s_recv_drop_bad_checksum
;
578 uint64_t s_recv_drop_old_seq
;
579 uint64_t s_recv_drop_no_sock
;
580 uint64_t s_recv_drop_dead_sock
;
581 uint64_t s_recv_deliver_raced
;
582 uint64_t s_recv_delivered
;
583 uint64_t s_recv_queued
;
584 uint64_t s_recv_immediate_retry
;
585 uint64_t s_recv_delayed_retry
;
586 uint64_t s_recv_ack_required
;
587 uint64_t s_recv_rdma_bytes
;
588 uint64_t s_recv_ping
;
589 uint64_t s_send_queue_empty
;
590 uint64_t s_send_queue_full
;
591 uint64_t s_send_lock_contention
;
592 uint64_t s_send_lock_queue_raced
;
593 uint64_t s_send_immediate_retry
;
594 uint64_t s_send_delayed_retry
;
595 uint64_t s_send_drop_acked
;
596 uint64_t s_send_ack_required
;
597 uint64_t s_send_queued
;
598 uint64_t s_send_rdma
;
599 uint64_t s_send_rdma_bytes
;
600 uint64_t s_send_pong
;
601 uint64_t s_page_remainder_hit
;
602 uint64_t s_page_remainder_miss
;
603 uint64_t s_copy_to_user
;
604 uint64_t s_copy_from_user
;
605 uint64_t s_cong_update_queued
;
606 uint64_t s_cong_update_received
;
607 uint64_t s_cong_send_error
;
608 uint64_t s_cong_send_blocked
;
612 void rds_sock_addref(struct rds_sock
*rs
);
613 void rds_sock_put(struct rds_sock
*rs
);
614 void rds_wake_sk_sleep(struct rds_sock
*rs
);
615 static inline void __rds_wake_sk_sleep(struct sock
*sk
)
617 wait_queue_head_t
*waitq
= sk_sleep(sk
);
619 if (!sock_flag(sk
, SOCK_DEAD
) && waitq
)
622 extern wait_queue_head_t rds_poll_waitq
;
626 int rds_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
627 void rds_remove_bound(struct rds_sock
*rs
);
628 struct rds_sock
*rds_find_bound(__be32 addr
, __be16 port
);
629 int rds_bind_lock_init(void);
630 void rds_bind_lock_destroy(void);
633 int rds_cong_get_maps(struct rds_connection
*conn
);
634 void rds_cong_add_conn(struct rds_connection
*conn
);
635 void rds_cong_remove_conn(struct rds_connection
*conn
);
636 void rds_cong_set_bit(struct rds_cong_map
*map
, __be16 port
);
637 void rds_cong_clear_bit(struct rds_cong_map
*map
, __be16 port
);
638 int rds_cong_wait(struct rds_cong_map
*map
, __be16 port
, int nonblock
, struct rds_sock
*rs
);
639 void rds_cong_queue_updates(struct rds_cong_map
*map
);
640 void rds_cong_map_updated(struct rds_cong_map
*map
, uint64_t);
641 int rds_cong_updated_since(unsigned long *recent
);
642 void rds_cong_add_socket(struct rds_sock
*);
643 void rds_cong_remove_socket(struct rds_sock
*);
644 void rds_cong_exit(void);
645 struct rds_message
*rds_cong_update_alloc(struct rds_connection
*conn
);
648 int rds_conn_init(void);
649 void rds_conn_exit(void);
650 struct rds_connection
*rds_conn_create(struct net
*net
,
651 __be32 laddr
, __be32 faddr
,
652 struct rds_transport
*trans
, gfp_t gfp
);
653 struct rds_connection
*rds_conn_create_outgoing(struct net
*net
,
654 __be32 laddr
, __be32 faddr
,
655 struct rds_transport
*trans
, gfp_t gfp
);
656 void rds_conn_shutdown(struct rds_connection
*conn
);
657 void rds_conn_destroy(struct rds_connection
*conn
);
658 void rds_conn_drop(struct rds_connection
*conn
);
659 void rds_conn_path_drop(struct rds_conn_path
*cpath
);
660 void rds_conn_connect_if_down(struct rds_connection
*conn
);
661 void rds_for_each_conn_info(struct socket
*sock
, unsigned int len
,
662 struct rds_info_iterator
*iter
,
663 struct rds_info_lengths
*lens
,
664 int (*visitor
)(struct rds_connection
*, void *),
667 void __rds_conn_error(struct rds_connection
*conn
, const char *, ...);
668 #define rds_conn_error(conn, fmt...) \
669 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
672 rds_conn_path_transition(struct rds_conn_path
*cp
, int old
, int new)
674 return atomic_cmpxchg(&cp
->cp_state
, old
, new) == old
;
678 rds_conn_transition(struct rds_connection
*conn
, int old
, int new)
680 WARN_ON(conn
->c_trans
->t_mp_capable
);
681 return rds_conn_path_transition(&conn
->c_path
[0], old
, new);
685 rds_conn_path_state(struct rds_conn_path
*cp
)
687 return atomic_read(&cp
->cp_state
);
691 rds_conn_state(struct rds_connection
*conn
)
693 WARN_ON(conn
->c_trans
->t_mp_capable
);
694 return rds_conn_path_state(&conn
->c_path
[0]);
698 rds_conn_path_up(struct rds_conn_path
*cp
)
700 return atomic_read(&cp
->cp_state
) == RDS_CONN_UP
;
704 rds_conn_up(struct rds_connection
*conn
)
706 WARN_ON(conn
->c_trans
->t_mp_capable
);
707 return rds_conn_path_up(&conn
->c_path
[0]);
711 rds_conn_path_connecting(struct rds_conn_path
*cp
)
713 return atomic_read(&cp
->cp_state
) == RDS_CONN_CONNECTING
;
717 rds_conn_connecting(struct rds_connection
*conn
)
719 WARN_ON(conn
->c_trans
->t_mp_capable
);
720 return rds_conn_path_connecting(&conn
->c_path
[0]);
724 struct rds_message
*rds_message_alloc(unsigned int nents
, gfp_t gfp
);
725 struct scatterlist
*rds_message_alloc_sgs(struct rds_message
*rm
, int nents
);
726 int rds_message_copy_from_user(struct rds_message
*rm
, struct iov_iter
*from
);
727 struct rds_message
*rds_message_map_pages(unsigned long *page_addrs
, unsigned int total_len
);
728 void rds_message_populate_header(struct rds_header
*hdr
, __be16 sport
,
729 __be16 dport
, u64 seq
);
730 int rds_message_add_extension(struct rds_header
*hdr
,
731 unsigned int type
, const void *data
, unsigned int len
);
732 int rds_message_next_extension(struct rds_header
*hdr
,
733 unsigned int *pos
, void *buf
, unsigned int *buflen
);
734 int rds_message_add_rdma_dest_extension(struct rds_header
*hdr
, u32 r_key
, u32 offset
);
735 int rds_message_inc_copy_to_user(struct rds_incoming
*inc
, struct iov_iter
*to
);
736 void rds_message_inc_free(struct rds_incoming
*inc
);
737 void rds_message_addref(struct rds_message
*rm
);
738 void rds_message_put(struct rds_message
*rm
);
739 void rds_message_wait(struct rds_message
*rm
);
740 void rds_message_unmapped(struct rds_message
*rm
);
742 static inline void rds_message_make_checksum(struct rds_header
*hdr
)
745 hdr
->h_csum
= ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2);
748 static inline int rds_message_verify_checksum(const struct rds_header
*hdr
)
750 return !hdr
->h_csum
|| ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2) == 0;
755 int rds_page_remainder_alloc(struct scatterlist
*scat
, unsigned long bytes
,
757 int rds_page_copy_user(struct page
*page
, unsigned long offset
,
758 void __user
*ptr
, unsigned long bytes
,
760 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
761 rds_page_copy_user(page, offset, ptr, bytes, 1)
762 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
763 rds_page_copy_user(page, offset, ptr, bytes, 0)
764 void rds_page_exit(void);
767 void rds_inc_init(struct rds_incoming
*inc
, struct rds_connection
*conn
,
769 void rds_inc_path_init(struct rds_incoming
*inc
, struct rds_conn_path
*conn
,
771 void rds_inc_put(struct rds_incoming
*inc
);
772 void rds_recv_incoming(struct rds_connection
*conn
, __be32 saddr
, __be32 daddr
,
773 struct rds_incoming
*inc
, gfp_t gfp
);
774 int rds_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
776 void rds_clear_recv_queue(struct rds_sock
*rs
);
777 int rds_notify_queue_get(struct rds_sock
*rs
, struct msghdr
*msg
);
778 void rds_inc_info_copy(struct rds_incoming
*inc
,
779 struct rds_info_iterator
*iter
,
780 __be32 saddr
, __be32 daddr
, int flip
);
783 int rds_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t payload_len
);
784 void rds_send_reset(struct rds_connection
*conn
);
785 int rds_send_xmit(struct rds_conn_path
*cp
);
787 void rds_send_drop_to(struct rds_sock
*rs
, struct sockaddr_in
*dest
);
788 typedef int (*is_acked_func
)(struct rds_message
*rm
, uint64_t ack
);
789 void rds_send_drop_acked(struct rds_connection
*conn
, u64 ack
,
790 is_acked_func is_acked
);
791 void rds_send_path_drop_acked(struct rds_conn_path
*cp
, u64 ack
,
792 is_acked_func is_acked
);
793 int rds_send_pong(struct rds_conn_path
*cp
, __be16 dport
);
796 void rds_rdma_unuse(struct rds_sock
*rs
, u32 r_key
, int force
);
797 int rds_get_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
798 int rds_get_mr_for_dest(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
799 int rds_free_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
800 void rds_rdma_drop_keys(struct rds_sock
*rs
);
801 int rds_rdma_extra_size(struct rds_rdma_args
*args
);
802 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
803 struct cmsghdr
*cmsg
);
804 int rds_cmsg_rdma_dest(struct rds_sock
*rs
, struct rds_message
*rm
,
805 struct cmsghdr
*cmsg
);
806 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
807 struct cmsghdr
*cmsg
);
808 int rds_cmsg_rdma_map(struct rds_sock
*rs
, struct rds_message
*rm
,
809 struct cmsghdr
*cmsg
);
810 void rds_rdma_free_op(struct rm_rdma_op
*ro
);
811 void rds_atomic_free_op(struct rm_atomic_op
*ao
);
812 void rds_rdma_send_complete(struct rds_message
*rm
, int wc_status
);
813 void rds_atomic_send_complete(struct rds_message
*rm
, int wc_status
);
814 int rds_cmsg_atomic(struct rds_sock
*rs
, struct rds_message
*rm
,
815 struct cmsghdr
*cmsg
);
817 void __rds_put_mr_final(struct rds_mr
*mr
);
818 static inline void rds_mr_put(struct rds_mr
*mr
)
820 if (atomic_dec_and_test(&mr
->r_refcount
))
821 __rds_put_mr_final(mr
);
825 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics
, rds_stats
);
826 #define rds_stats_inc_which(which, member) do { \
827 per_cpu(which, get_cpu()).member++; \
830 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
831 #define rds_stats_add_which(which, member, count) do { \
832 per_cpu(which, get_cpu()).member += count; \
835 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
836 int rds_stats_init(void);
837 void rds_stats_exit(void);
838 void rds_stats_info_copy(struct rds_info_iterator
*iter
,
839 uint64_t *values
, const char *const *names
,
843 int rds_sysctl_init(void);
844 void rds_sysctl_exit(void);
845 extern unsigned long rds_sysctl_sndbuf_min
;
846 extern unsigned long rds_sysctl_sndbuf_default
;
847 extern unsigned long rds_sysctl_sndbuf_max
;
848 extern unsigned long rds_sysctl_reconnect_min_jiffies
;
849 extern unsigned long rds_sysctl_reconnect_max_jiffies
;
850 extern unsigned int rds_sysctl_max_unacked_packets
;
851 extern unsigned int rds_sysctl_max_unacked_bytes
;
852 extern unsigned int rds_sysctl_ping_enable
;
853 extern unsigned long rds_sysctl_trace_flags
;
854 extern unsigned int rds_sysctl_trace_level
;
857 int rds_threads_init(void);
858 void rds_threads_exit(void);
859 extern struct workqueue_struct
*rds_wq
;
860 void rds_queue_reconnect(struct rds_conn_path
*cp
);
861 void rds_connect_worker(struct work_struct
*);
862 void rds_shutdown_worker(struct work_struct
*);
863 void rds_send_worker(struct work_struct
*);
864 void rds_recv_worker(struct work_struct
*);
865 void rds_connect_path_complete(struct rds_conn_path
*conn
, int curr
);
866 void rds_connect_complete(struct rds_connection
*conn
);
869 int rds_trans_register(struct rds_transport
*trans
);
870 void rds_trans_unregister(struct rds_transport
*trans
);
871 struct rds_transport
*rds_trans_get_preferred(struct net
*net
, __be32 addr
);
872 void rds_trans_put(struct rds_transport
*trans
);
873 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator
*iter
,
875 struct rds_transport
*rds_trans_get(int t_type
);
876 int rds_trans_init(void);
877 void rds_trans_exit(void);