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_header i_hdr
;
235 unsigned long i_rx_jiffies
;
238 rds_rdma_cookie_t i_rdma_cookie
;
239 struct timeval i_rx_tstamp
;
243 struct rb_node r_rb_node
;
247 /* A copy of the creation flags */
248 unsigned int r_use_once
:1;
249 unsigned int r_invalidate
:1;
250 unsigned int r_write
:1;
252 /* This is for RDS_MR_DEAD.
253 * It would be nice & consistent to make this part of the above
254 * bit field here, but we need to use test_and_set_bit.
256 unsigned long r_state
;
257 struct rds_sock
*r_sock
; /* back pointer to the socket that owns us */
258 struct rds_transport
*r_trans
;
259 void *r_trans_private
;
262 /* Flags for mr->r_state */
263 #define RDS_MR_DEAD 0
265 static inline rds_rdma_cookie_t
rds_rdma_make_cookie(u32 r_key
, u32 offset
)
267 return r_key
| (((u64
) offset
) << 32);
270 static inline u32
rds_rdma_cookie_key(rds_rdma_cookie_t cookie
)
275 static inline u32
rds_rdma_cookie_offset(rds_rdma_cookie_t cookie
)
280 /* atomic operation types */
281 #define RDS_ATOMIC_TYPE_CSWP 0
282 #define RDS_ATOMIC_TYPE_FADD 1
285 * m_sock_item and m_conn_item are on lists that are serialized under
286 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
287 * the message will not be put back on the retransmit list after being sent.
288 * messages that are canceled while being sent rely on this.
290 * m_inc is used by loopback so that it can pass an incoming message straight
291 * back up into the rx path. It embeds a wire header which is also used by
292 * the send path, which is kind of awkward.
294 * m_sock_item indicates the message's presence on a socket's send or receive
295 * queue. m_rs will point to that socket.
297 * m_daddr is used by cancellation to prune messages to a given destination.
299 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
300 * nesting. As paths iterate over messages on a sock, or conn, they must
301 * also lock the conn, or sock, to remove the message from those lists too.
302 * Testing the flag to determine if the message is still on the lists lets
303 * us avoid testing the list_head directly. That means each path can use
304 * the message's list_head to keep it on a local list while juggling locks
305 * without confusing the other path.
307 * m_ack_seq is an optional field set by transports who need a different
308 * sequence number range to invalidate. They can use this in a callback
309 * that they pass to rds_send_drop_acked() to see if each message has been
310 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
311 * had ack_seq set yet.
313 #define RDS_MSG_ON_SOCK 1
314 #define RDS_MSG_ON_CONN 2
315 #define RDS_MSG_HAS_ACK_SEQ 3
316 #define RDS_MSG_ACK_REQUIRED 4
317 #define RDS_MSG_RETRANSMITTED 5
318 #define RDS_MSG_MAPPED 6
319 #define RDS_MSG_PAGEVEC 7
323 struct list_head m_sock_item
;
324 struct list_head m_conn_item
;
325 struct rds_incoming m_inc
;
328 unsigned long m_flags
;
330 /* Never access m_rs without holding m_rs_lock.
335 spinlock_t m_rs_lock
;
336 wait_queue_head_t m_flush_wait
;
338 struct rds_sock
*m_rs
;
340 /* cookie to send to remote, in rds header */
341 rds_rdma_cookie_t m_rdma_cookie
;
343 unsigned int m_used_sgs
;
344 unsigned int m_total_sgs
;
349 struct rm_atomic_op
{
355 uint64_t compare_mask
;
360 uint64_t nocarry_mask
;
366 unsigned int op_notify
:1;
367 unsigned int op_recverr
:1;
368 unsigned int op_mapped
:1;
369 unsigned int op_silent
:1;
370 unsigned int op_active
:1;
371 struct scatterlist
*op_sg
;
372 struct rds_notifier
*op_notifier
;
374 struct rds_mr
*op_rdma_mr
;
379 unsigned int op_write
:1;
380 unsigned int op_fence
:1;
381 unsigned int op_notify
:1;
382 unsigned int op_recverr
:1;
383 unsigned int op_mapped
:1;
384 unsigned int op_silent
:1;
385 unsigned int op_active
:1;
386 unsigned int op_bytes
;
387 unsigned int op_nents
;
388 unsigned int op_count
;
389 struct scatterlist
*op_sg
;
390 struct rds_notifier
*op_notifier
;
392 struct rds_mr
*op_rdma_mr
;
395 unsigned int op_active
:1;
396 unsigned int op_nents
;
397 unsigned int op_count
;
398 unsigned int op_dmasg
;
399 unsigned int op_dmaoff
;
400 struct scatterlist
*op_sg
;
406 * The RDS notifier is used (optionally) to tell the application about
407 * completed RDMA operations. Rather than keeping the whole rds message
408 * around on the queue, we allocate a small notifier that is put on the
409 * socket's notifier_list. Notifications are delivered to the application
410 * through control messages.
412 struct rds_notifier
{
413 struct list_head n_list
;
414 uint64_t n_user_token
;
419 * struct rds_transport - transport specific behavioural hooks
421 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
422 * part of a message. The caller serializes on the send_sem so this
423 * doesn't need to be reentrant for a given conn. The header must be
424 * sent before the data payload. .xmit must be prepared to send a
425 * message with no data payload. .xmit should return the number of
426 * bytes that were sent down the connection, including header bytes.
427 * Returning 0 tells the caller that it doesn't need to perform any
428 * additional work now. This is usually the case when the transport has
429 * filled the sending queue for its connection and will handle
430 * triggering the rds thread to continue the send when space becomes
431 * available. Returning -EAGAIN tells the caller to retry the send
432 * immediately. Returning -ENOMEM tells the caller to retry the send at
433 * some point in the future.
435 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
436 * it returns the connection can not call rds_recv_incoming().
437 * This will only be called once after conn_connect returns
438 * non-zero success and will The caller serializes this with
439 * the send and connecting paths (xmit_* and conn_*). The
440 * transport is responsible for other serialization, including
441 * rds_recv_incoming(). This is called in process context but
442 * should try hard not to block.
445 struct rds_transport
{
446 char t_name
[TRANSNAMSIZ
];
447 struct list_head t_item
;
448 struct module
*t_owner
;
449 unsigned int t_prefer_loopback
:1;
452 int (*laddr_check
)(struct net
*net
, __be32 addr
);
453 int (*conn_alloc
)(struct rds_connection
*conn
, gfp_t gfp
);
454 void (*conn_free
)(void *data
);
455 int (*conn_connect
)(struct rds_connection
*conn
);
456 void (*conn_shutdown
)(struct rds_connection
*conn
);
457 void (*xmit_prepare
)(struct rds_connection
*conn
);
458 void (*xmit_complete
)(struct rds_connection
*conn
);
459 int (*xmit
)(struct rds_connection
*conn
, struct rds_message
*rm
,
460 unsigned int hdr_off
, unsigned int sg
, unsigned int off
);
461 int (*xmit_rdma
)(struct rds_connection
*conn
, struct rm_rdma_op
*op
);
462 int (*xmit_atomic
)(struct rds_connection
*conn
, struct rm_atomic_op
*op
);
463 int (*recv
)(struct rds_connection
*conn
);
464 int (*inc_copy_to_user
)(struct rds_incoming
*inc
, struct iov_iter
*to
);
465 void (*inc_free
)(struct rds_incoming
*inc
);
467 int (*cm_handle_connect
)(struct rdma_cm_id
*cm_id
,
468 struct rdma_cm_event
*event
);
469 int (*cm_initiate_connect
)(struct rdma_cm_id
*cm_id
);
470 void (*cm_connect_complete
)(struct rds_connection
*conn
,
471 struct rdma_cm_event
*event
);
473 unsigned int (*stats_info_copy
)(struct rds_info_iterator
*iter
,
476 void *(*get_mr
)(struct scatterlist
*sg
, unsigned long nr_sg
,
477 struct rds_sock
*rs
, u32
*key_ret
);
478 void (*sync_mr
)(void *trans_private
, int direction
);
479 void (*free_mr
)(void *trans_private
, int invalidate
);
480 void (*flush_mrs
)(void);
490 * bound_addr used for both incoming and outgoing, no INADDR_ANY
493 struct rhash_head rs_bound_node
;
495 __be32 rs_bound_addr
;
497 __be16 rs_bound_port
;
499 struct rds_transport
*rs_transport
;
502 * rds_sendmsg caches the conn it used the last time around.
503 * This helps avoid costly lookups.
505 struct rds_connection
*rs_conn
;
507 /* flag indicating we were congested or not */
509 /* seen congestion (ENOBUFS) when sending? */
510 int rs_seen_congestion
;
512 /* rs_lock protects all these adjacent members before the newline */
514 struct list_head rs_send_queue
;
517 struct list_head rs_notify_queue
; /* currently used for failed RDMAs */
519 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
520 * to decide whether the application should be woken up.
521 * If not set, we use rs_cong_track to find out whether a cong map
524 uint64_t rs_cong_mask
;
525 uint64_t rs_cong_notify
;
526 struct list_head rs_cong_list
;
527 unsigned long rs_cong_track
;
530 * rs_recv_lock protects the receive queue, and is
531 * used to serialize with rds_release.
533 rwlock_t rs_recv_lock
;
534 struct list_head rs_recv_queue
;
536 /* just for stats reporting */
537 struct list_head rs_item
;
539 /* these have their own lock */
540 spinlock_t rs_rdma_lock
;
541 struct rb_root rs_rdma_keys
;
543 /* Socket options - in case there will be more */
544 unsigned char rs_recverr
,
548 static inline struct rds_sock
*rds_sk_to_rs(const struct sock
*sk
)
550 return container_of(sk
, struct rds_sock
, rs_sk
);
552 static inline struct sock
*rds_rs_to_sk(struct rds_sock
*rs
)
558 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
559 * to account for overhead. We don't account for overhead, we just apply
560 * the number of payload bytes to the specified value.
562 static inline int rds_sk_sndbuf(struct rds_sock
*rs
)
564 return rds_rs_to_sk(rs
)->sk_sndbuf
/ 2;
566 static inline int rds_sk_rcvbuf(struct rds_sock
*rs
)
568 return rds_rs_to_sk(rs
)->sk_rcvbuf
/ 2;
571 struct rds_statistics
{
572 uint64_t s_conn_reset
;
573 uint64_t s_recv_drop_bad_checksum
;
574 uint64_t s_recv_drop_old_seq
;
575 uint64_t s_recv_drop_no_sock
;
576 uint64_t s_recv_drop_dead_sock
;
577 uint64_t s_recv_deliver_raced
;
578 uint64_t s_recv_delivered
;
579 uint64_t s_recv_queued
;
580 uint64_t s_recv_immediate_retry
;
581 uint64_t s_recv_delayed_retry
;
582 uint64_t s_recv_ack_required
;
583 uint64_t s_recv_rdma_bytes
;
584 uint64_t s_recv_ping
;
585 uint64_t s_send_queue_empty
;
586 uint64_t s_send_queue_full
;
587 uint64_t s_send_lock_contention
;
588 uint64_t s_send_lock_queue_raced
;
589 uint64_t s_send_immediate_retry
;
590 uint64_t s_send_delayed_retry
;
591 uint64_t s_send_drop_acked
;
592 uint64_t s_send_ack_required
;
593 uint64_t s_send_queued
;
594 uint64_t s_send_rdma
;
595 uint64_t s_send_rdma_bytes
;
596 uint64_t s_send_pong
;
597 uint64_t s_page_remainder_hit
;
598 uint64_t s_page_remainder_miss
;
599 uint64_t s_copy_to_user
;
600 uint64_t s_copy_from_user
;
601 uint64_t s_cong_update_queued
;
602 uint64_t s_cong_update_received
;
603 uint64_t s_cong_send_error
;
604 uint64_t s_cong_send_blocked
;
608 void rds_sock_addref(struct rds_sock
*rs
);
609 void rds_sock_put(struct rds_sock
*rs
);
610 void rds_wake_sk_sleep(struct rds_sock
*rs
);
611 static inline void __rds_wake_sk_sleep(struct sock
*sk
)
613 wait_queue_head_t
*waitq
= sk_sleep(sk
);
615 if (!sock_flag(sk
, SOCK_DEAD
) && waitq
)
618 extern wait_queue_head_t rds_poll_waitq
;
622 int rds_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
);
623 void rds_remove_bound(struct rds_sock
*rs
);
624 struct rds_sock
*rds_find_bound(__be32 addr
, __be16 port
);
625 int rds_bind_lock_init(void);
626 void rds_bind_lock_destroy(void);
629 int rds_cong_get_maps(struct rds_connection
*conn
);
630 void rds_cong_add_conn(struct rds_connection
*conn
);
631 void rds_cong_remove_conn(struct rds_connection
*conn
);
632 void rds_cong_set_bit(struct rds_cong_map
*map
, __be16 port
);
633 void rds_cong_clear_bit(struct rds_cong_map
*map
, __be16 port
);
634 int rds_cong_wait(struct rds_cong_map
*map
, __be16 port
, int nonblock
, struct rds_sock
*rs
);
635 void rds_cong_queue_updates(struct rds_cong_map
*map
);
636 void rds_cong_map_updated(struct rds_cong_map
*map
, uint64_t);
637 int rds_cong_updated_since(unsigned long *recent
);
638 void rds_cong_add_socket(struct rds_sock
*);
639 void rds_cong_remove_socket(struct rds_sock
*);
640 void rds_cong_exit(void);
641 struct rds_message
*rds_cong_update_alloc(struct rds_connection
*conn
);
644 int rds_conn_init(void);
645 void rds_conn_exit(void);
646 struct rds_connection
*rds_conn_create(struct net
*net
,
647 __be32 laddr
, __be32 faddr
,
648 struct rds_transport
*trans
, gfp_t gfp
);
649 struct rds_connection
*rds_conn_create_outgoing(struct net
*net
,
650 __be32 laddr
, __be32 faddr
,
651 struct rds_transport
*trans
, gfp_t gfp
);
652 void rds_conn_shutdown(struct rds_connection
*conn
);
653 void rds_conn_destroy(struct rds_connection
*conn
);
654 void rds_conn_drop(struct rds_connection
*conn
);
655 void rds_conn_path_drop(struct rds_conn_path
*cpath
);
656 void rds_conn_connect_if_down(struct rds_connection
*conn
);
657 void rds_for_each_conn_info(struct socket
*sock
, unsigned int len
,
658 struct rds_info_iterator
*iter
,
659 struct rds_info_lengths
*lens
,
660 int (*visitor
)(struct rds_connection
*, void *),
663 void __rds_conn_error(struct rds_connection
*conn
, const char *, ...);
664 #define rds_conn_error(conn, fmt...) \
665 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
668 rds_conn_path_transition(struct rds_conn_path
*cp
, int old
, int new)
670 return atomic_cmpxchg(&cp
->cp_state
, old
, new) == old
;
674 rds_conn_transition(struct rds_connection
*conn
, int old
, int new)
676 return rds_conn_path_transition(&conn
->c_path
[0], old
, new);
680 rds_conn_path_state(struct rds_conn_path
*cp
)
682 return atomic_read(&cp
->cp_state
);
686 rds_conn_state(struct rds_connection
*conn
)
688 return rds_conn_path_state(&conn
->c_path
[0]);
692 rds_conn_path_up(struct rds_conn_path
*cp
)
694 return atomic_read(&cp
->cp_state
) == RDS_CONN_UP
;
698 rds_conn_up(struct rds_connection
*conn
)
700 return rds_conn_path_up(&conn
->c_path
[0]);
704 rds_conn_path_connecting(struct rds_conn_path
*cp
)
706 return atomic_read(&cp
->cp_state
) == RDS_CONN_CONNECTING
;
710 rds_conn_connecting(struct rds_connection
*conn
)
712 return rds_conn_path_connecting(&conn
->c_path
[0]);
716 struct rds_message
*rds_message_alloc(unsigned int nents
, gfp_t gfp
);
717 struct scatterlist
*rds_message_alloc_sgs(struct rds_message
*rm
, int nents
);
718 int rds_message_copy_from_user(struct rds_message
*rm
, struct iov_iter
*from
);
719 struct rds_message
*rds_message_map_pages(unsigned long *page_addrs
, unsigned int total_len
);
720 void rds_message_populate_header(struct rds_header
*hdr
, __be16 sport
,
721 __be16 dport
, u64 seq
);
722 int rds_message_add_extension(struct rds_header
*hdr
,
723 unsigned int type
, const void *data
, unsigned int len
);
724 int rds_message_next_extension(struct rds_header
*hdr
,
725 unsigned int *pos
, void *buf
, unsigned int *buflen
);
726 int rds_message_add_rdma_dest_extension(struct rds_header
*hdr
, u32 r_key
, u32 offset
);
727 int rds_message_inc_copy_to_user(struct rds_incoming
*inc
, struct iov_iter
*to
);
728 void rds_message_inc_free(struct rds_incoming
*inc
);
729 void rds_message_addref(struct rds_message
*rm
);
730 void rds_message_put(struct rds_message
*rm
);
731 void rds_message_wait(struct rds_message
*rm
);
732 void rds_message_unmapped(struct rds_message
*rm
);
734 static inline void rds_message_make_checksum(struct rds_header
*hdr
)
737 hdr
->h_csum
= ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2);
740 static inline int rds_message_verify_checksum(const struct rds_header
*hdr
)
742 return !hdr
->h_csum
|| ip_fast_csum((void *) hdr
, sizeof(*hdr
) >> 2) == 0;
747 int rds_page_remainder_alloc(struct scatterlist
*scat
, unsigned long bytes
,
749 int rds_page_copy_user(struct page
*page
, unsigned long offset
,
750 void __user
*ptr
, unsigned long bytes
,
752 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
753 rds_page_copy_user(page, offset, ptr, bytes, 1)
754 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
755 rds_page_copy_user(page, offset, ptr, bytes, 0)
756 void rds_page_exit(void);
759 void rds_inc_init(struct rds_incoming
*inc
, struct rds_connection
*conn
,
761 void rds_inc_put(struct rds_incoming
*inc
);
762 void rds_recv_incoming(struct rds_connection
*conn
, __be32 saddr
, __be32 daddr
,
763 struct rds_incoming
*inc
, gfp_t gfp
);
764 int rds_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t size
,
766 void rds_clear_recv_queue(struct rds_sock
*rs
);
767 int rds_notify_queue_get(struct rds_sock
*rs
, struct msghdr
*msg
);
768 void rds_inc_info_copy(struct rds_incoming
*inc
,
769 struct rds_info_iterator
*iter
,
770 __be32 saddr
, __be32 daddr
, int flip
);
773 int rds_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t payload_len
);
774 void rds_send_reset(struct rds_connection
*conn
);
775 int rds_send_xmit(struct rds_connection
*conn
);
777 void rds_send_drop_to(struct rds_sock
*rs
, struct sockaddr_in
*dest
);
778 typedef int (*is_acked_func
)(struct rds_message
*rm
, uint64_t ack
);
779 void rds_send_drop_acked(struct rds_connection
*conn
, u64 ack
,
780 is_acked_func is_acked
);
781 int rds_send_pong(struct rds_connection
*conn
, __be16 dport
);
782 struct rds_message
*rds_send_get_message(struct rds_connection
*,
783 struct rm_rdma_op
*);
786 void rds_rdma_unuse(struct rds_sock
*rs
, u32 r_key
, int force
);
787 int rds_get_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
788 int rds_get_mr_for_dest(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
789 int rds_free_mr(struct rds_sock
*rs
, char __user
*optval
, int optlen
);
790 void rds_rdma_drop_keys(struct rds_sock
*rs
);
791 int rds_rdma_extra_size(struct rds_rdma_args
*args
);
792 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
793 struct cmsghdr
*cmsg
);
794 int rds_cmsg_rdma_dest(struct rds_sock
*rs
, struct rds_message
*rm
,
795 struct cmsghdr
*cmsg
);
796 int rds_cmsg_rdma_args(struct rds_sock
*rs
, struct rds_message
*rm
,
797 struct cmsghdr
*cmsg
);
798 int rds_cmsg_rdma_map(struct rds_sock
*rs
, struct rds_message
*rm
,
799 struct cmsghdr
*cmsg
);
800 void rds_rdma_free_op(struct rm_rdma_op
*ro
);
801 void rds_atomic_free_op(struct rm_atomic_op
*ao
);
802 void rds_rdma_send_complete(struct rds_message
*rm
, int wc_status
);
803 void rds_atomic_send_complete(struct rds_message
*rm
, int wc_status
);
804 int rds_cmsg_atomic(struct rds_sock
*rs
, struct rds_message
*rm
,
805 struct cmsghdr
*cmsg
);
807 void __rds_put_mr_final(struct rds_mr
*mr
);
808 static inline void rds_mr_put(struct rds_mr
*mr
)
810 if (atomic_dec_and_test(&mr
->r_refcount
))
811 __rds_put_mr_final(mr
);
815 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics
, rds_stats
);
816 #define rds_stats_inc_which(which, member) do { \
817 per_cpu(which, get_cpu()).member++; \
820 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
821 #define rds_stats_add_which(which, member, count) do { \
822 per_cpu(which, get_cpu()).member += count; \
825 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
826 int rds_stats_init(void);
827 void rds_stats_exit(void);
828 void rds_stats_info_copy(struct rds_info_iterator
*iter
,
829 uint64_t *values
, const char *const *names
,
833 int rds_sysctl_init(void);
834 void rds_sysctl_exit(void);
835 extern unsigned long rds_sysctl_sndbuf_min
;
836 extern unsigned long rds_sysctl_sndbuf_default
;
837 extern unsigned long rds_sysctl_sndbuf_max
;
838 extern unsigned long rds_sysctl_reconnect_min_jiffies
;
839 extern unsigned long rds_sysctl_reconnect_max_jiffies
;
840 extern unsigned int rds_sysctl_max_unacked_packets
;
841 extern unsigned int rds_sysctl_max_unacked_bytes
;
842 extern unsigned int rds_sysctl_ping_enable
;
843 extern unsigned long rds_sysctl_trace_flags
;
844 extern unsigned int rds_sysctl_trace_level
;
847 int rds_threads_init(void);
848 void rds_threads_exit(void);
849 extern struct workqueue_struct
*rds_wq
;
850 void rds_queue_reconnect(struct rds_conn_path
*cp
);
851 void rds_connect_worker(struct work_struct
*);
852 void rds_shutdown_worker(struct work_struct
*);
853 void rds_send_worker(struct work_struct
*);
854 void rds_recv_worker(struct work_struct
*);
855 void rds_connect_path_complete(struct rds_conn_path
*conn
, int curr
);
856 void rds_connect_complete(struct rds_connection
*conn
);
859 int rds_trans_register(struct rds_transport
*trans
);
860 void rds_trans_unregister(struct rds_transport
*trans
);
861 struct rds_transport
*rds_trans_get_preferred(struct net
*net
, __be32 addr
);
862 void rds_trans_put(struct rds_transport
*trans
);
863 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator
*iter
,
865 struct rds_transport
*rds_trans_get(int t_type
);
866 int rds_trans_init(void);
867 void rds_trans_exit(void);