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 KERNEL_HAS_ATOMIC64
36 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
38 /* sigh, pr_debug() causes unused variable warnings */
39 static inline void __attribute__ ((format (printf, 1, 2)))
40 rdsdebug(char *fmt, ...)
45 /* XXX is there one of these somewhere? */
47 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
49 #define RDS_FRAG_SHIFT 12
50 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
52 #define RDS_CONG_MAP_BYTES (65536 / 8)
53 #define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long))
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,
80 /* Bits for c_flags */
81 #define RDS_LL_SEND_FULL 0
82 #define RDS_RECONNECT_PENDING 1
84 struct rds_connection {
85 struct hlist_node c_hash_node;
88 unsigned int c_loopback:1;
89 struct rds_connection *c_passive;
91 struct rds_cong_map *c_lcong;
92 struct rds_cong_map *c_fcong;
94 struct mutex c_send_lock; /* protect send ring */
95 struct rds_message *c_xmit_rm;
96 unsigned long c_xmit_sg;
97 unsigned int c_xmit_hdr_off;
98 unsigned int c_xmit_data_off;
99 unsigned int c_xmit_rdma_sent;
100 unsigned int c_xmit_atomic_sent;
102 spinlock_t c_lock; /* protect msg queues */
104 struct list_head c_send_queue;
105 struct list_head c_retrans;
109 struct rds_transport *c_trans;
110 void *c_transport_data;
113 unsigned long c_flags;
114 unsigned long c_reconnect_jiffies;
115 struct delayed_work c_send_w;
116 struct delayed_work c_recv_w;
117 struct delayed_work c_conn_w;
118 struct work_struct c_down_w;
119 struct mutex c_cm_lock; /* protect conn state & cm */
121 struct list_head c_map_item;
122 unsigned long c_map_queued;
123 unsigned long c_map_offset;
124 unsigned long c_map_bytes;
126 unsigned int c_unacked_packets;
127 unsigned int c_unacked_bytes;
129 /* Protocol version */
130 unsigned int c_version;
133 #define RDS_FLAG_CONG_BITMAP 0x01
134 #define RDS_FLAG_ACK_REQUIRED 0x02
135 #define RDS_FLAG_RETRANSMITTED 0x04
136 #define RDS_MAX_ADV_CREDIT 255
139 * Maximum space available for extension headers.
141 #define RDS_HEADER_EXT_SPACE 16
154 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
158 * Reserved - indicates end of extensions
160 #define RDS_EXTHDR_NONE 0
163 * This extension header is included in the very
164 * first message that is sent on a new connection,
165 * and identifies the protocol level. This will help
166 * rolling updates if a future change requires breaking
168 * NB: This is no longer true for IB, where we do a version
169 * negotiation during the connection setup phase (protocol
170 * version information is included in the RDMA CM private data).
172 #define RDS_EXTHDR_VERSION 1
173 struct rds_ext_header_version {
178 * This extension header is included in the RDS message
179 * chasing an RDMA operation.
181 #define RDS_EXTHDR_RDMA 2
182 struct rds_ext_header_rdma {
187 * This extension header tells the peer about the
188 * destination <R_Key,offset> of the requested RDMA
191 #define RDS_EXTHDR_RDMA_DEST 3
192 struct rds_ext_header_rdma_dest {
194 __be32 h_rdma_offset;
197 #define __RDS_EXTHDR_MAX 16 /* for now */
199 struct rds_incoming {
201 struct list_head i_item;
202 struct rds_connection *i_conn;
203 struct rds_header i_hdr;
204 unsigned long i_rx_jiffies;
207 rds_rdma_cookie_t i_rdma_cookie;
211 struct rb_node r_rb_node;
215 /* A copy of the creation flags */
216 unsigned int r_use_once:1;
217 unsigned int r_invalidate:1;
218 unsigned int r_write:1;
220 /* This is for RDS_MR_DEAD.
221 * It would be nice & consistent to make this part of the above
222 * bit field here, but we need to use test_and_set_bit.
224 unsigned long r_state;
225 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
226 struct rds_transport *r_trans;
227 void *r_trans_private;
230 /* Flags for mr->r_state */
231 #define RDS_MR_DEAD 0
236 unsigned int r_write:1;
237 unsigned int r_fence:1;
238 unsigned int r_notify:1;
239 unsigned int r_recverr:1;
240 unsigned int r_mapped:1;
241 unsigned int r_active:1;
242 struct rds_notifier *r_notifier;
243 unsigned int r_bytes;
244 unsigned int r_nents;
245 unsigned int r_count;
246 struct scatterlist *r_sg;
249 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
251 return r_key | (((u64) offset) << 32);
254 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
259 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
264 /* atomic operation types */
265 #define RDS_ATOMIC_TYPE_CSWP 0
266 #define RDS_ATOMIC_TYPE_FADD 1
269 * m_sock_item and m_conn_item are on lists that are serialized under
270 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
271 * the message will not be put back on the retransmit list after being sent.
272 * messages that are canceled while being sent rely on this.
274 * m_inc is used by loopback so that it can pass an incoming message straight
275 * back up into the rx path. It embeds a wire header which is also used by
276 * the send path, which is kind of awkward.
278 * m_sock_item indicates the message's presence on a socket's send or receive
279 * queue. m_rs will point to that socket.
281 * m_daddr is used by cancellation to prune messages to a given destination.
283 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
284 * nesting. As paths iterate over messages on a sock, or conn, they must
285 * also lock the conn, or sock, to remove the message from those lists too.
286 * Testing the flag to determine if the message is still on the lists lets
287 * us avoid testing the list_head directly. That means each path can use
288 * the message's list_head to keep it on a local list while juggling locks
289 * without confusing the other path.
291 * m_ack_seq is an optional field set by transports who need a different
292 * sequence number range to invalidate. They can use this in a callback
293 * that they pass to rds_send_drop_acked() to see if each message has been
294 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
295 * had ack_seq set yet.
297 #define RDS_MSG_ON_SOCK 1
298 #define RDS_MSG_ON_CONN 2
299 #define RDS_MSG_HAS_ACK_SEQ 3
300 #define RDS_MSG_ACK_REQUIRED 4
301 #define RDS_MSG_RETRANSMITTED 5
302 #define RDS_MSG_MAPPED 6
303 #define RDS_MSG_PAGEVEC 7
307 struct list_head m_sock_item;
308 struct list_head m_conn_item;
309 struct rds_incoming m_inc;
312 unsigned long m_flags;
314 /* Never access m_rs without holding m_rs_lock.
319 spinlock_t m_rs_lock;
320 struct rds_sock *m_rs;
321 rds_rdma_cookie_t m_rdma_cookie;
323 struct rm_atomic_op {
325 uint64_t op_swap_add;
330 unsigned int op_notify:1;
331 unsigned int op_recverr:1;
332 unsigned int op_mapped:1;
333 unsigned int op_active:1;
334 struct rds_notifier *op_notifier;
335 struct scatterlist *op_sg;
337 struct rds_mr *op_rdma_mr;
340 struct rds_rdma_op m_rdma_op;
341 struct rds_mr *m_rdma_mr;
344 unsigned int m_nents;
345 unsigned int m_count;
346 struct scatterlist *m_sg;
349 unsigned int m_used_sgs;
350 unsigned int m_total_sgs;
354 * The RDS notifier is used (optionally) to tell the application about
355 * completed RDMA operations. Rather than keeping the whole rds message
356 * around on the queue, we allocate a small notifier that is put on the
357 * socket's notifier_list. Notifications are delivered to the application
358 * through control messages.
360 struct rds_notifier {
361 struct list_head n_list;
362 uint64_t n_user_token;
367 * struct rds_transport - transport specific behavioural hooks
369 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
370 * part of a message. The caller serializes on the send_sem so this
371 * doesn't need to be reentrant for a given conn. The header must be
372 * sent before the data payload. .xmit must be prepared to send a
373 * message with no data payload. .xmit should return the number of
374 * bytes that were sent down the connection, including header bytes.
375 * Returning 0 tells the caller that it doesn't need to perform any
376 * additional work now. This is usually the case when the transport has
377 * filled the sending queue for its connection and will handle
378 * triggering the rds thread to continue the send when space becomes
379 * available. Returning -EAGAIN tells the caller to retry the send
380 * immediately. Returning -ENOMEM tells the caller to retry the send at
381 * some point in the future.
383 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
384 * it returns the connection can not call rds_recv_incoming().
385 * This will only be called once after conn_connect returns
386 * non-zero success and will The caller serializes this with
387 * the send and connecting paths (xmit_* and conn_*). The
388 * transport is responsible for other serialization, including
389 * rds_recv_incoming(). This is called in process context but
390 * should try hard not to block.
392 * @xmit_cong_map: This asks the transport to send the local bitmap down the
393 * given connection. XXX get a better story about the bitmap
397 #define RDS_TRANS_IB 0
398 #define RDS_TRANS_IWARP 1
399 #define RDS_TRANS_TCP 2
400 #define RDS_TRANS_COUNT 3
402 struct rds_transport {
403 char t_name[TRANSNAMSIZ];
404 struct list_head t_item;
405 struct module *t_owner;
406 unsigned int t_prefer_loopback:1;
409 int (*laddr_check)(__be32 addr);
410 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
411 void (*conn_free)(void *data);
412 int (*conn_connect)(struct rds_connection *conn);
413 void (*conn_shutdown)(struct rds_connection *conn);
414 void (*xmit_prepare)(struct rds_connection *conn);
415 void (*xmit_complete)(struct rds_connection *conn);
416 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
417 unsigned int hdr_off, unsigned int sg, unsigned int off);
418 int (*xmit_cong_map)(struct rds_connection *conn,
419 struct rds_cong_map *map, unsigned long offset);
420 int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
421 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
422 int (*recv)(struct rds_connection *conn);
423 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
425 void (*inc_free)(struct rds_incoming *inc);
427 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
428 struct rdma_cm_event *event);
429 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
430 void (*cm_connect_complete)(struct rds_connection *conn,
431 struct rdma_cm_event *event);
433 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
436 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
437 struct rds_sock *rs, u32 *key_ret);
438 void (*sync_mr)(void *trans_private, int direction);
439 void (*free_mr)(void *trans_private, int invalidate);
440 void (*flush_mrs)(void);
450 * bound_addr used for both incoming and outgoing, no INADDR_ANY
453 struct rb_node rs_bound_node;
454 __be32 rs_bound_addr;
456 __be16 rs_bound_port;
460 * This is only used to communicate the transport between bind and
461 * initiating connections. All other trans use is referenced through
464 struct rds_transport *rs_transport;
467 * rds_sendmsg caches the conn it used the last time around.
468 * This helps avoid costly lookups.
470 struct rds_connection *rs_conn;
472 /* flag indicating we were congested or not */
474 /* seen congestion (ENOBUFS) when sending? */
475 int rs_seen_congestion;
477 /* rs_lock protects all these adjacent members before the newline */
479 struct list_head rs_send_queue;
482 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
484 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
485 * to decide whether the application should be woken up.
486 * If not set, we use rs_cong_track to find out whether a cong map
489 uint64_t rs_cong_mask;
490 uint64_t rs_cong_notify;
491 struct list_head rs_cong_list;
492 unsigned long rs_cong_track;
495 * rs_recv_lock protects the receive queue, and is
496 * used to serialize with rds_release.
498 rwlock_t rs_recv_lock;
499 struct list_head rs_recv_queue;
501 /* just for stats reporting */
502 struct list_head rs_item;
504 /* these have their own lock */
505 spinlock_t rs_rdma_lock;
506 struct rb_root rs_rdma_keys;
508 /* Socket options - in case there will be more */
509 unsigned char rs_recverr,
513 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
515 return container_of(sk, struct rds_sock, rs_sk);
517 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
523 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
524 * to account for overhead. We don't account for overhead, we just apply
525 * the number of payload bytes to the specified value.
527 static inline int rds_sk_sndbuf(struct rds_sock *rs)
529 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
531 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
533 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
536 struct rds_statistics {
537 uint64_t s_conn_reset;
538 uint64_t s_recv_drop_bad_checksum;
539 uint64_t s_recv_drop_old_seq;
540 uint64_t s_recv_drop_no_sock;
541 uint64_t s_recv_drop_dead_sock;
542 uint64_t s_recv_deliver_raced;
543 uint64_t s_recv_delivered;
544 uint64_t s_recv_queued;
545 uint64_t s_recv_immediate_retry;
546 uint64_t s_recv_delayed_retry;
547 uint64_t s_recv_ack_required;
548 uint64_t s_recv_rdma_bytes;
549 uint64_t s_recv_ping;
550 uint64_t s_send_queue_empty;
551 uint64_t s_send_queue_full;
552 uint64_t s_send_sem_contention;
553 uint64_t s_send_sem_queue_raced;
554 uint64_t s_send_immediate_retry;
555 uint64_t s_send_delayed_retry;
556 uint64_t s_send_drop_acked;
557 uint64_t s_send_ack_required;
558 uint64_t s_send_queued;
559 uint64_t s_send_rdma;
560 uint64_t s_send_rdma_bytes;
561 uint64_t s_send_pong;
562 uint64_t s_page_remainder_hit;
563 uint64_t s_page_remainder_miss;
564 uint64_t s_copy_to_user;
565 uint64_t s_copy_from_user;
566 uint64_t s_cong_update_queued;
567 uint64_t s_cong_update_received;
568 uint64_t s_cong_send_error;
569 uint64_t s_cong_send_blocked;
570 uint64_t s_atomic_cswp;
571 uint64_t s_atomic_fadd;
575 void rds_sock_addref(struct rds_sock *rs);
576 void rds_sock_put(struct rds_sock *rs);
577 void rds_wake_sk_sleep(struct rds_sock *rs);
578 static inline void __rds_wake_sk_sleep(struct sock *sk)
580 wait_queue_head_t *waitq = sk_sleep(sk);
582 if (!sock_flag(sk, SOCK_DEAD) && waitq)
585 extern wait_queue_head_t rds_poll_waitq;
589 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
590 void rds_remove_bound(struct rds_sock *rs);
591 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
594 int rds_cong_get_maps(struct rds_connection *conn);
595 void rds_cong_add_conn(struct rds_connection *conn);
596 void rds_cong_remove_conn(struct rds_connection *conn);
597 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
598 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
599 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
600 void rds_cong_queue_updates(struct rds_cong_map *map);
601 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
602 int rds_cong_updated_since(unsigned long *recent);
603 void rds_cong_add_socket(struct rds_sock *);
604 void rds_cong_remove_socket(struct rds_sock *);
605 void rds_cong_exit(void);
606 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
609 int __init rds_conn_init(void);
610 void rds_conn_exit(void);
611 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
612 struct rds_transport *trans, gfp_t gfp);
613 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
614 struct rds_transport *trans, gfp_t gfp);
615 void rds_conn_shutdown(struct rds_connection *conn);
616 void rds_conn_destroy(struct rds_connection *conn);
617 void rds_conn_reset(struct rds_connection *conn);
618 void rds_conn_drop(struct rds_connection *conn);
619 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
620 struct rds_info_iterator *iter,
621 struct rds_info_lengths *lens,
622 int (*visitor)(struct rds_connection *, void *),
624 void __rds_conn_error(struct rds_connection *conn, const char *, ...)
625 __attribute__ ((format (printf, 2, 3)));
626 #define rds_conn_error(conn, fmt...) \
627 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
630 rds_conn_transition(struct rds_connection *conn, int old, int new)
632 return atomic_cmpxchg(&conn->c_state, old, new) == old;
636 rds_conn_state(struct rds_connection *conn)
638 return atomic_read(&conn->c_state);
642 rds_conn_up(struct rds_connection *conn)
644 return atomic_read(&conn->c_state) == RDS_CONN_UP;
648 rds_conn_connecting(struct rds_connection *conn)
650 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
654 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
655 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
656 int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
658 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
659 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
660 __be16 dport, u64 seq);
661 int rds_message_add_extension(struct rds_header *hdr,
662 unsigned int type, const void *data, unsigned int len);
663 int rds_message_next_extension(struct rds_header *hdr,
664 unsigned int *pos, void *buf, unsigned int *buflen);
665 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version);
666 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version);
667 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
668 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
669 struct iovec *first_iov, size_t size);
670 void rds_message_inc_free(struct rds_incoming *inc);
671 void rds_message_addref(struct rds_message *rm);
672 void rds_message_put(struct rds_message *rm);
673 void rds_message_wait(struct rds_message *rm);
674 void rds_message_unmapped(struct rds_message *rm);
676 static inline void rds_message_make_checksum(struct rds_header *hdr)
679 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
682 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
684 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
689 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
691 int rds_page_copy_user(struct page *page, unsigned long offset,
692 void __user *ptr, unsigned long bytes,
694 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
695 rds_page_copy_user(page, offset, ptr, bytes, 1)
696 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
697 rds_page_copy_user(page, offset, ptr, bytes, 0)
698 void rds_page_exit(void);
701 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
703 void rds_inc_addref(struct rds_incoming *inc);
704 void rds_inc_put(struct rds_incoming *inc);
705 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
706 struct rds_incoming *inc, gfp_t gfp, enum km_type km);
707 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
708 size_t size, int msg_flags);
709 void rds_clear_recv_queue(struct rds_sock *rs);
710 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
711 void rds_inc_info_copy(struct rds_incoming *inc,
712 struct rds_info_iterator *iter,
713 __be32 saddr, __be32 daddr, int flip);
716 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
718 void rds_send_reset(struct rds_connection *conn);
719 int rds_send_xmit(struct rds_connection *conn);
721 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
722 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
723 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
724 is_acked_func is_acked);
725 int rds_send_acked_before(struct rds_connection *conn, u64 seq);
726 void rds_send_remove_from_sock(struct list_head *messages, int status);
727 int rds_send_pong(struct rds_connection *conn, __be16 dport);
728 struct rds_message *rds_send_get_message(struct rds_connection *,
729 struct rds_rdma_op *);
732 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
733 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
734 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
735 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
736 void rds_rdma_drop_keys(struct rds_sock *rs);
737 int rds_rdma_extra_size(struct rds_rdma_args *args);
738 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
739 struct cmsghdr *cmsg);
740 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
741 struct cmsghdr *cmsg);
742 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
743 struct cmsghdr *cmsg);
744 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
745 struct cmsghdr *cmsg);
746 void rds_rdma_free_op(struct rds_rdma_op *ro);
747 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
748 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
749 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
750 struct cmsghdr *cmsg);
752 extern void __rds_put_mr_final(struct rds_mr *mr);
753 static inline void rds_mr_put(struct rds_mr *mr)
755 if (atomic_dec_and_test(&mr->r_refcount))
756 __rds_put_mr_final(mr);
760 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
761 #define rds_stats_inc_which(which, member) do { \
762 per_cpu(which, get_cpu()).member++; \
765 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
766 #define rds_stats_add_which(which, member, count) do { \
767 per_cpu(which, get_cpu()).member += count; \
770 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
771 int __init rds_stats_init(void);
772 void rds_stats_exit(void);
773 void rds_stats_info_copy(struct rds_info_iterator *iter,
774 uint64_t *values, const char *const *names,
778 int __init rds_sysctl_init(void);
779 void rds_sysctl_exit(void);
780 extern unsigned long rds_sysctl_sndbuf_min;
781 extern unsigned long rds_sysctl_sndbuf_default;
782 extern unsigned long rds_sysctl_sndbuf_max;
783 extern unsigned long rds_sysctl_reconnect_min_jiffies;
784 extern unsigned long rds_sysctl_reconnect_max_jiffies;
785 extern unsigned int rds_sysctl_max_unacked_packets;
786 extern unsigned int rds_sysctl_max_unacked_bytes;
787 extern unsigned int rds_sysctl_ping_enable;
788 extern unsigned long rds_sysctl_trace_flags;
789 extern unsigned int rds_sysctl_trace_level;
792 int __init rds_threads_init(void);
793 void rds_threads_exit(void);
794 extern struct workqueue_struct *rds_wq;
795 void rds_queue_reconnect(struct rds_connection *conn);
796 void rds_connect_worker(struct work_struct *);
797 void rds_shutdown_worker(struct work_struct *);
798 void rds_send_worker(struct work_struct *);
799 void rds_recv_worker(struct work_struct *);
800 void rds_connect_complete(struct rds_connection *conn);
803 int rds_trans_register(struct rds_transport *trans);
804 void rds_trans_unregister(struct rds_transport *trans);
805 struct rds_transport *rds_trans_get_preferred(__be32 addr);
806 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
808 int __init rds_trans_init(void);
809 void rds_trans_exit(void);