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_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
54 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
57 struct rb_node m_rb_node;
59 wait_queue_head_t m_waitq;
60 struct list_head m_conn_list;
61 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES];
66 * This is how we will track the connection state:
67 * A connection is always in one of the following
68 * states. Updates to the state are atomic and imply
74 RDS_CONN_DISCONNECTING,
79 /* Bits for c_flags */
80 #define RDS_LL_SEND_FULL 0
81 #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 rds_message *c_xmit_rm;
95 unsigned long c_xmit_sg;
96 unsigned int c_xmit_hdr_off;
97 unsigned int c_xmit_data_off;
98 unsigned int c_xmit_atomic_sent;
99 unsigned int c_xmit_rdma_sent;
100 unsigned int c_xmit_data_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 */
120 wait_queue_head_t c_waitq;
122 struct list_head c_map_item;
123 unsigned long c_map_queued;
125 unsigned int c_unacked_packets;
126 unsigned int c_unacked_bytes;
128 /* Protocol version */
129 unsigned int c_version;
132 #define RDS_FLAG_CONG_BITMAP 0x01
133 #define RDS_FLAG_ACK_REQUIRED 0x02
134 #define RDS_FLAG_RETRANSMITTED 0x04
135 #define RDS_MAX_ADV_CREDIT 255
138 * Maximum space available for extension headers.
140 #define RDS_HEADER_EXT_SPACE 16
153 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
157 * Reserved - indicates end of extensions
159 #define RDS_EXTHDR_NONE 0
162 * This extension header is included in the very
163 * first message that is sent on a new connection,
164 * and identifies the protocol level. This will help
165 * rolling updates if a future change requires breaking
167 * NB: This is no longer true for IB, where we do a version
168 * negotiation during the connection setup phase (protocol
169 * version information is included in the RDMA CM private data).
171 #define RDS_EXTHDR_VERSION 1
172 struct rds_ext_header_version {
177 * This extension header is included in the RDS message
178 * chasing an RDMA operation.
180 #define RDS_EXTHDR_RDMA 2
181 struct rds_ext_header_rdma {
186 * This extension header tells the peer about the
187 * destination <R_Key,offset> of the requested RDMA
190 #define RDS_EXTHDR_RDMA_DEST 3
191 struct rds_ext_header_rdma_dest {
193 __be32 h_rdma_offset;
196 #define __RDS_EXTHDR_MAX 16 /* for now */
198 struct rds_incoming {
200 struct list_head i_item;
201 struct rds_connection *i_conn;
202 struct rds_header i_hdr;
203 unsigned long i_rx_jiffies;
206 rds_rdma_cookie_t i_rdma_cookie;
210 struct rb_node r_rb_node;
214 /* A copy of the creation flags */
215 unsigned int r_use_once:1;
216 unsigned int r_invalidate:1;
217 unsigned int r_write:1;
219 /* This is for RDS_MR_DEAD.
220 * It would be nice & consistent to make this part of the above
221 * bit field here, but we need to use test_and_set_bit.
223 unsigned long r_state;
224 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
225 struct rds_transport *r_trans;
226 void *r_trans_private;
229 /* Flags for mr->r_state */
230 #define RDS_MR_DEAD 0
232 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
234 return r_key | (((u64) offset) << 32);
237 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
242 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
247 /* atomic operation types */
248 #define RDS_ATOMIC_TYPE_CSWP 0
249 #define RDS_ATOMIC_TYPE_FADD 1
252 * m_sock_item and m_conn_item are on lists that are serialized under
253 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
254 * the message will not be put back on the retransmit list after being sent.
255 * messages that are canceled while being sent rely on this.
257 * m_inc is used by loopback so that it can pass an incoming message straight
258 * back up into the rx path. It embeds a wire header which is also used by
259 * the send path, which is kind of awkward.
261 * m_sock_item indicates the message's presence on a socket's send or receive
262 * queue. m_rs will point to that socket.
264 * m_daddr is used by cancellation to prune messages to a given destination.
266 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
267 * nesting. As paths iterate over messages on a sock, or conn, they must
268 * also lock the conn, or sock, to remove the message from those lists too.
269 * Testing the flag to determine if the message is still on the lists lets
270 * us avoid testing the list_head directly. That means each path can use
271 * the message's list_head to keep it on a local list while juggling locks
272 * without confusing the other path.
274 * m_ack_seq is an optional field set by transports who need a different
275 * sequence number range to invalidate. They can use this in a callback
276 * that they pass to rds_send_drop_acked() to see if each message has been
277 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
278 * had ack_seq set yet.
280 #define RDS_MSG_ON_SOCK 1
281 #define RDS_MSG_ON_CONN 2
282 #define RDS_MSG_HAS_ACK_SEQ 3
283 #define RDS_MSG_ACK_REQUIRED 4
284 #define RDS_MSG_RETRANSMITTED 5
285 #define RDS_MSG_MAPPED 6
286 #define RDS_MSG_PAGEVEC 7
290 struct list_head m_sock_item;
291 struct list_head m_conn_item;
292 struct rds_incoming m_inc;
295 unsigned long m_flags;
297 /* Never access m_rs without holding m_rs_lock.
302 spinlock_t m_rs_lock;
303 wait_queue_head_t m_flush_wait;
305 struct rds_sock *m_rs;
307 /* cookie to send to remote, in rds header */
308 rds_rdma_cookie_t m_rdma_cookie;
310 unsigned int m_used_sgs;
311 unsigned int m_total_sgs;
316 struct rm_atomic_op {
322 uint64_t compare_mask;
327 uint64_t nocarry_mask;
333 unsigned int op_notify:1;
334 unsigned int op_recverr:1;
335 unsigned int op_mapped:1;
336 unsigned int op_silent:1;
337 unsigned int op_active:1;
338 struct scatterlist *op_sg;
339 struct rds_notifier *op_notifier;
341 struct rds_mr *op_rdma_mr;
346 unsigned int op_write:1;
347 unsigned int op_fence:1;
348 unsigned int op_notify:1;
349 unsigned int op_recverr:1;
350 unsigned int op_mapped:1;
351 unsigned int op_silent:1;
352 unsigned int op_active:1;
353 unsigned int op_bytes;
354 unsigned int op_nents;
355 unsigned int op_count;
356 struct scatterlist *op_sg;
357 struct rds_notifier *op_notifier;
359 struct rds_mr *op_rdma_mr;
362 unsigned int op_active:1;
363 unsigned int op_nents;
364 unsigned int op_count;
365 struct scatterlist *op_sg;
371 * The RDS notifier is used (optionally) to tell the application about
372 * completed RDMA operations. Rather than keeping the whole rds message
373 * around on the queue, we allocate a small notifier that is put on the
374 * socket's notifier_list. Notifications are delivered to the application
375 * through control messages.
377 struct rds_notifier {
378 struct list_head n_list;
379 uint64_t n_user_token;
384 * struct rds_transport - transport specific behavioural hooks
386 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
387 * part of a message. The caller serializes on the send_sem so this
388 * doesn't need to be reentrant for a given conn. The header must be
389 * sent before the data payload. .xmit must be prepared to send a
390 * message with no data payload. .xmit should return the number of
391 * bytes that were sent down the connection, including header bytes.
392 * Returning 0 tells the caller that it doesn't need to perform any
393 * additional work now. This is usually the case when the transport has
394 * filled the sending queue for its connection and will handle
395 * triggering the rds thread to continue the send when space becomes
396 * available. Returning -EAGAIN tells the caller to retry the send
397 * immediately. Returning -ENOMEM tells the caller to retry the send at
398 * some point in the future.
400 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
401 * it returns the connection can not call rds_recv_incoming().
402 * This will only be called once after conn_connect returns
403 * non-zero success and will The caller serializes this with
404 * the send and connecting paths (xmit_* and conn_*). The
405 * transport is responsible for other serialization, including
406 * rds_recv_incoming(). This is called in process context but
407 * should try hard not to block.
410 #define RDS_TRANS_IB 0
411 #define RDS_TRANS_IWARP 1
412 #define RDS_TRANS_TCP 2
413 #define RDS_TRANS_COUNT 3
415 struct rds_transport {
416 char t_name[TRANSNAMSIZ];
417 struct list_head t_item;
418 struct module *t_owner;
419 unsigned int t_prefer_loopback:1;
422 int (*laddr_check)(__be32 addr);
423 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
424 void (*conn_free)(void *data);
425 int (*conn_connect)(struct rds_connection *conn);
426 void (*conn_shutdown)(struct rds_connection *conn);
427 void (*xmit_prepare)(struct rds_connection *conn);
428 void (*xmit_complete)(struct rds_connection *conn);
429 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
430 unsigned int hdr_off, unsigned int sg, unsigned int off);
431 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
432 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
433 int (*recv)(struct rds_connection *conn);
434 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
436 void (*inc_free)(struct rds_incoming *inc);
438 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
439 struct rdma_cm_event *event);
440 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
441 void (*cm_connect_complete)(struct rds_connection *conn,
442 struct rdma_cm_event *event);
444 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
447 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
448 struct rds_sock *rs, u32 *key_ret);
449 void (*sync_mr)(void *trans_private, int direction);
450 void (*free_mr)(void *trans_private, int invalidate);
451 void (*flush_mrs)(void);
461 * bound_addr used for both incoming and outgoing, no INADDR_ANY
464 struct hlist_node rs_bound_node;
465 __be32 rs_bound_addr;
467 __be16 rs_bound_port;
469 struct rds_transport *rs_transport;
472 * rds_sendmsg caches the conn it used the last time around.
473 * This helps avoid costly lookups.
475 struct rds_connection *rs_conn;
477 /* flag indicating we were congested or not */
479 /* seen congestion (ENOBUFS) when sending? */
480 int rs_seen_congestion;
482 /* rs_lock protects all these adjacent members before the newline */
484 struct list_head rs_send_queue;
487 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
489 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
490 * to decide whether the application should be woken up.
491 * If not set, we use rs_cong_track to find out whether a cong map
494 uint64_t rs_cong_mask;
495 uint64_t rs_cong_notify;
496 struct list_head rs_cong_list;
497 unsigned long rs_cong_track;
500 * rs_recv_lock protects the receive queue, and is
501 * used to serialize with rds_release.
503 rwlock_t rs_recv_lock;
504 struct list_head rs_recv_queue;
506 /* just for stats reporting */
507 struct list_head rs_item;
509 /* these have their own lock */
510 spinlock_t rs_rdma_lock;
511 struct rb_root rs_rdma_keys;
513 /* Socket options - in case there will be more */
514 unsigned char rs_recverr,
518 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
520 return container_of(sk, struct rds_sock, rs_sk);
522 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
528 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
529 * to account for overhead. We don't account for overhead, we just apply
530 * the number of payload bytes to the specified value.
532 static inline int rds_sk_sndbuf(struct rds_sock *rs)
534 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
536 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
538 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
541 struct rds_statistics {
542 uint64_t s_conn_reset;
543 uint64_t s_recv_drop_bad_checksum;
544 uint64_t s_recv_drop_old_seq;
545 uint64_t s_recv_drop_no_sock;
546 uint64_t s_recv_drop_dead_sock;
547 uint64_t s_recv_deliver_raced;
548 uint64_t s_recv_delivered;
549 uint64_t s_recv_queued;
550 uint64_t s_recv_immediate_retry;
551 uint64_t s_recv_delayed_retry;
552 uint64_t s_recv_ack_required;
553 uint64_t s_recv_rdma_bytes;
554 uint64_t s_recv_ping;
555 uint64_t s_send_queue_empty;
556 uint64_t s_send_queue_full;
557 uint64_t s_send_lock_contention;
558 uint64_t s_send_lock_queue_raced;
559 uint64_t s_send_immediate_retry;
560 uint64_t s_send_delayed_retry;
561 uint64_t s_send_drop_acked;
562 uint64_t s_send_ack_required;
563 uint64_t s_send_queued;
564 uint64_t s_send_rdma;
565 uint64_t s_send_rdma_bytes;
566 uint64_t s_send_pong;
567 uint64_t s_page_remainder_hit;
568 uint64_t s_page_remainder_miss;
569 uint64_t s_copy_to_user;
570 uint64_t s_copy_from_user;
571 uint64_t s_cong_update_queued;
572 uint64_t s_cong_update_received;
573 uint64_t s_cong_send_error;
574 uint64_t s_cong_send_blocked;
578 char *rds_str_array(char **array, size_t elements, size_t index);
579 void rds_sock_addref(struct rds_sock *rs);
580 void rds_sock_put(struct rds_sock *rs);
581 void rds_wake_sk_sleep(struct rds_sock *rs);
582 static inline void __rds_wake_sk_sleep(struct sock *sk)
584 wait_queue_head_t *waitq = sk_sleep(sk);
586 if (!sock_flag(sk, SOCK_DEAD) && waitq)
589 extern wait_queue_head_t rds_poll_waitq;
593 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
594 void rds_remove_bound(struct rds_sock *rs);
595 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
598 int rds_cong_get_maps(struct rds_connection *conn);
599 void rds_cong_add_conn(struct rds_connection *conn);
600 void rds_cong_remove_conn(struct rds_connection *conn);
601 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
602 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
603 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
604 void rds_cong_queue_updates(struct rds_cong_map *map);
605 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
606 int rds_cong_updated_since(unsigned long *recent);
607 void rds_cong_add_socket(struct rds_sock *);
608 void rds_cong_remove_socket(struct rds_sock *);
609 void rds_cong_exit(void);
610 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
613 int rds_conn_init(void);
614 void rds_conn_exit(void);
615 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
616 struct rds_transport *trans, gfp_t gfp);
617 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
618 struct rds_transport *trans, gfp_t gfp);
619 void rds_conn_shutdown(struct rds_connection *conn);
620 void rds_conn_destroy(struct rds_connection *conn);
621 void rds_conn_drop(struct rds_connection *conn);
622 void rds_conn_connect_if_down(struct rds_connection *conn);
623 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
624 struct rds_info_iterator *iter,
625 struct rds_info_lengths *lens,
626 int (*visitor)(struct rds_connection *, void *),
628 void __rds_conn_error(struct rds_connection *conn, const char *, ...)
629 __attribute__ ((format (printf, 2, 3)));
630 #define rds_conn_error(conn, fmt...) \
631 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
634 rds_conn_transition(struct rds_connection *conn, int old, int new)
636 return atomic_cmpxchg(&conn->c_state, old, new) == old;
640 rds_conn_state(struct rds_connection *conn)
642 return atomic_read(&conn->c_state);
646 rds_conn_up(struct rds_connection *conn)
648 return atomic_read(&conn->c_state) == RDS_CONN_UP;
652 rds_conn_connecting(struct rds_connection *conn)
654 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
658 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
659 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
660 int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
662 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
663 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
664 __be16 dport, u64 seq);
665 int rds_message_add_extension(struct rds_header *hdr,
666 unsigned int type, const void *data, unsigned int len);
667 int rds_message_next_extension(struct rds_header *hdr,
668 unsigned int *pos, void *buf, unsigned int *buflen);
669 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
670 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
671 struct iovec *first_iov, size_t size);
672 void rds_message_inc_free(struct rds_incoming *inc);
673 void rds_message_addref(struct rds_message *rm);
674 void rds_message_put(struct rds_message *rm);
675 void rds_message_wait(struct rds_message *rm);
676 void rds_message_unmapped(struct rds_message *rm);
678 static inline void rds_message_make_checksum(struct rds_header *hdr)
681 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
684 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
686 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
691 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
693 int rds_page_copy_user(struct page *page, unsigned long offset,
694 void __user *ptr, unsigned long bytes,
696 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
697 rds_page_copy_user(page, offset, ptr, bytes, 1)
698 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
699 rds_page_copy_user(page, offset, ptr, bytes, 0)
700 void rds_page_exit(void);
703 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
705 void rds_inc_put(struct rds_incoming *inc);
706 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
707 struct rds_incoming *inc, gfp_t gfp, enum km_type km);
708 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
709 size_t size, int msg_flags);
710 void rds_clear_recv_queue(struct rds_sock *rs);
711 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
712 void rds_inc_info_copy(struct rds_incoming *inc,
713 struct rds_info_iterator *iter,
714 __be32 saddr, __be32 daddr, int flip);
717 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
719 void rds_send_reset(struct rds_connection *conn);
720 int rds_send_xmit(struct rds_connection *conn);
722 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
723 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
724 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
725 is_acked_func is_acked);
726 int rds_send_pong(struct rds_connection *conn, __be16 dport);
727 struct rds_message *rds_send_get_message(struct rds_connection *,
728 struct rm_rdma_op *);
731 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
732 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
733 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
734 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
735 void rds_rdma_drop_keys(struct rds_sock *rs);
736 int rds_rdma_extra_size(struct rds_rdma_args *args);
737 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
738 struct cmsghdr *cmsg);
739 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
740 struct cmsghdr *cmsg);
741 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
742 struct cmsghdr *cmsg);
743 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
744 struct cmsghdr *cmsg);
745 void rds_rdma_free_op(struct rm_rdma_op *ro);
746 void rds_atomic_free_op(struct rm_atomic_op *ao);
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 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 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 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 void rds_trans_put(struct rds_transport *trans);
807 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
809 int rds_trans_init(void);
810 void rds_trans_exit(void);