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 __printf(1, 2)
40 void 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_send_gen;
114 unsigned long c_flags;
115 unsigned long c_reconnect_jiffies;
116 struct delayed_work c_send_w;
117 struct delayed_work c_recv_w;
118 struct delayed_work c_conn_w;
119 struct work_struct c_down_w;
120 struct mutex c_cm_lock; /* protect conn state & cm */
121 wait_queue_head_t c_waitq;
123 struct list_head c_map_item;
124 unsigned long c_map_queued;
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
233 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
235 return r_key | (((u64) offset) << 32);
238 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
243 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
248 /* atomic operation types */
249 #define RDS_ATOMIC_TYPE_CSWP 0
250 #define RDS_ATOMIC_TYPE_FADD 1
253 * m_sock_item and m_conn_item are on lists that are serialized under
254 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
255 * the message will not be put back on the retransmit list after being sent.
256 * messages that are canceled while being sent rely on this.
258 * m_inc is used by loopback so that it can pass an incoming message straight
259 * back up into the rx path. It embeds a wire header which is also used by
260 * the send path, which is kind of awkward.
262 * m_sock_item indicates the message's presence on a socket's send or receive
263 * queue. m_rs will point to that socket.
265 * m_daddr is used by cancellation to prune messages to a given destination.
267 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
268 * nesting. As paths iterate over messages on a sock, or conn, they must
269 * also lock the conn, or sock, to remove the message from those lists too.
270 * Testing the flag to determine if the message is still on the lists lets
271 * us avoid testing the list_head directly. That means each path can use
272 * the message's list_head to keep it on a local list while juggling locks
273 * without confusing the other path.
275 * m_ack_seq is an optional field set by transports who need a different
276 * sequence number range to invalidate. They can use this in a callback
277 * that they pass to rds_send_drop_acked() to see if each message has been
278 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
279 * had ack_seq set yet.
281 #define RDS_MSG_ON_SOCK 1
282 #define RDS_MSG_ON_CONN 2
283 #define RDS_MSG_HAS_ACK_SEQ 3
284 #define RDS_MSG_ACK_REQUIRED 4
285 #define RDS_MSG_RETRANSMITTED 5
286 #define RDS_MSG_MAPPED 6
287 #define RDS_MSG_PAGEVEC 7
291 struct list_head m_sock_item;
292 struct list_head m_conn_item;
293 struct rds_incoming m_inc;
296 unsigned long m_flags;
298 /* Never access m_rs without holding m_rs_lock.
303 spinlock_t m_rs_lock;
304 wait_queue_head_t m_flush_wait;
306 struct rds_sock *m_rs;
308 /* cookie to send to remote, in rds header */
309 rds_rdma_cookie_t m_rdma_cookie;
311 unsigned int m_used_sgs;
312 unsigned int m_total_sgs;
317 struct rm_atomic_op {
323 uint64_t compare_mask;
328 uint64_t nocarry_mask;
334 unsigned int op_notify:1;
335 unsigned int op_recverr:1;
336 unsigned int op_mapped:1;
337 unsigned int op_silent:1;
338 unsigned int op_active:1;
339 struct scatterlist *op_sg;
340 struct rds_notifier *op_notifier;
342 struct rds_mr *op_rdma_mr;
347 unsigned int op_write:1;
348 unsigned int op_fence:1;
349 unsigned int op_notify:1;
350 unsigned int op_recverr:1;
351 unsigned int op_mapped:1;
352 unsigned int op_silent:1;
353 unsigned int op_active:1;
354 unsigned int op_bytes;
355 unsigned int op_nents;
356 unsigned int op_count;
357 struct scatterlist *op_sg;
358 struct rds_notifier *op_notifier;
360 struct rds_mr *op_rdma_mr;
363 unsigned int op_active:1;
364 unsigned int op_nents;
365 unsigned int op_count;
366 unsigned int op_dmasg;
367 unsigned int op_dmaoff;
368 struct scatterlist *op_sg;
374 * The RDS notifier is used (optionally) to tell the application about
375 * completed RDMA operations. Rather than keeping the whole rds message
376 * around on the queue, we allocate a small notifier that is put on the
377 * socket's notifier_list. Notifications are delivered to the application
378 * through control messages.
380 struct rds_notifier {
381 struct list_head n_list;
382 uint64_t n_user_token;
387 * struct rds_transport - transport specific behavioural hooks
389 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
390 * part of a message. The caller serializes on the send_sem so this
391 * doesn't need to be reentrant for a given conn. The header must be
392 * sent before the data payload. .xmit must be prepared to send a
393 * message with no data payload. .xmit should return the number of
394 * bytes that were sent down the connection, including header bytes.
395 * Returning 0 tells the caller that it doesn't need to perform any
396 * additional work now. This is usually the case when the transport has
397 * filled the sending queue for its connection and will handle
398 * triggering the rds thread to continue the send when space becomes
399 * available. Returning -EAGAIN tells the caller to retry the send
400 * immediately. Returning -ENOMEM tells the caller to retry the send at
401 * some point in the future.
403 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
404 * it returns the connection can not call rds_recv_incoming().
405 * This will only be called once after conn_connect returns
406 * non-zero success and will The caller serializes this with
407 * the send and connecting paths (xmit_* and conn_*). The
408 * transport is responsible for other serialization, including
409 * rds_recv_incoming(). This is called in process context but
410 * should try hard not to block.
413 struct rds_transport {
414 char t_name[TRANSNAMSIZ];
415 struct list_head t_item;
416 struct module *t_owner;
417 unsigned int t_prefer_loopback:1;
420 int (*laddr_check)(__be32 addr);
421 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
422 void (*conn_free)(void *data);
423 int (*conn_connect)(struct rds_connection *conn);
424 void (*conn_shutdown)(struct rds_connection *conn);
425 void (*xmit_prepare)(struct rds_connection *conn);
426 void (*xmit_complete)(struct rds_connection *conn);
427 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
428 unsigned int hdr_off, unsigned int sg, unsigned int off);
429 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
430 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
431 int (*recv)(struct rds_connection *conn);
432 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
433 void (*inc_free)(struct rds_incoming *inc);
435 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
436 struct rdma_cm_event *event);
437 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
438 void (*cm_connect_complete)(struct rds_connection *conn,
439 struct rdma_cm_event *event);
441 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
444 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
445 struct rds_sock *rs, u32 *key_ret);
446 void (*sync_mr)(void *trans_private, int direction);
447 void (*free_mr)(void *trans_private, int invalidate);
448 void (*flush_mrs)(void);
458 * bound_addr used for both incoming and outgoing, no INADDR_ANY
461 struct hlist_node rs_bound_node;
462 __be32 rs_bound_addr;
464 __be16 rs_bound_port;
466 struct rds_transport *rs_transport;
469 * rds_sendmsg caches the conn it used the last time around.
470 * This helps avoid costly lookups.
472 struct rds_connection *rs_conn;
474 /* flag indicating we were congested or not */
476 /* seen congestion (ENOBUFS) when sending? */
477 int rs_seen_congestion;
479 /* rs_lock protects all these adjacent members before the newline */
481 struct list_head rs_send_queue;
484 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
486 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
487 * to decide whether the application should be woken up.
488 * If not set, we use rs_cong_track to find out whether a cong map
491 uint64_t rs_cong_mask;
492 uint64_t rs_cong_notify;
493 struct list_head rs_cong_list;
494 unsigned long rs_cong_track;
497 * rs_recv_lock protects the receive queue, and is
498 * used to serialize with rds_release.
500 rwlock_t rs_recv_lock;
501 struct list_head rs_recv_queue;
503 /* just for stats reporting */
504 struct list_head rs_item;
506 /* these have their own lock */
507 spinlock_t rs_rdma_lock;
508 struct rb_root rs_rdma_keys;
510 /* Socket options - in case there will be more */
511 unsigned char rs_recverr,
515 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
517 return container_of(sk, struct rds_sock, rs_sk);
519 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
525 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
526 * to account for overhead. We don't account for overhead, we just apply
527 * the number of payload bytes to the specified value.
529 static inline int rds_sk_sndbuf(struct rds_sock *rs)
531 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
533 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
535 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
538 struct rds_statistics {
539 uint64_t s_conn_reset;
540 uint64_t s_recv_drop_bad_checksum;
541 uint64_t s_recv_drop_old_seq;
542 uint64_t s_recv_drop_no_sock;
543 uint64_t s_recv_drop_dead_sock;
544 uint64_t s_recv_deliver_raced;
545 uint64_t s_recv_delivered;
546 uint64_t s_recv_queued;
547 uint64_t s_recv_immediate_retry;
548 uint64_t s_recv_delayed_retry;
549 uint64_t s_recv_ack_required;
550 uint64_t s_recv_rdma_bytes;
551 uint64_t s_recv_ping;
552 uint64_t s_send_queue_empty;
553 uint64_t s_send_queue_full;
554 uint64_t s_send_lock_contention;
555 uint64_t s_send_lock_queue_raced;
556 uint64_t s_send_immediate_retry;
557 uint64_t s_send_delayed_retry;
558 uint64_t s_send_drop_acked;
559 uint64_t s_send_ack_required;
560 uint64_t s_send_queued;
561 uint64_t s_send_rdma;
562 uint64_t s_send_rdma_bytes;
563 uint64_t s_send_pong;
564 uint64_t s_page_remainder_hit;
565 uint64_t s_page_remainder_miss;
566 uint64_t s_copy_to_user;
567 uint64_t s_copy_from_user;
568 uint64_t s_cong_update_queued;
569 uint64_t s_cong_update_received;
570 uint64_t s_cong_send_error;
571 uint64_t s_cong_send_blocked;
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 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_drop(struct rds_connection *conn);
618 void rds_conn_connect_if_down(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 *),
625 void __rds_conn_error(struct rds_connection *conn, const char *, ...);
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 iov_iter *from);
657 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
658 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
659 __be16 dport, u64 seq);
660 int rds_message_add_extension(struct rds_header *hdr,
661 unsigned int type, const void *data, unsigned int len);
662 int rds_message_next_extension(struct rds_header *hdr,
663 unsigned int *pos, void *buf, unsigned int *buflen);
664 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
665 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
666 void rds_message_inc_free(struct rds_incoming *inc);
667 void rds_message_addref(struct rds_message *rm);
668 void rds_message_put(struct rds_message *rm);
669 void rds_message_wait(struct rds_message *rm);
670 void rds_message_unmapped(struct rds_message *rm);
672 static inline void rds_message_make_checksum(struct rds_header *hdr)
675 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
678 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
680 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
685 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
687 int rds_page_copy_user(struct page *page, unsigned long offset,
688 void __user *ptr, unsigned long bytes,
690 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
691 rds_page_copy_user(page, offset, ptr, bytes, 1)
692 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
693 rds_page_copy_user(page, offset, ptr, bytes, 0)
694 void rds_page_exit(void);
697 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
699 void rds_inc_put(struct rds_incoming *inc);
700 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
701 struct rds_incoming *inc, gfp_t gfp);
702 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
704 void rds_clear_recv_queue(struct rds_sock *rs);
705 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
706 void rds_inc_info_copy(struct rds_incoming *inc,
707 struct rds_info_iterator *iter,
708 __be32 saddr, __be32 daddr, int flip);
711 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
712 void rds_send_reset(struct rds_connection *conn);
713 int rds_send_xmit(struct rds_connection *conn);
715 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
716 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
717 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
718 is_acked_func is_acked);
719 int rds_send_pong(struct rds_connection *conn, __be16 dport);
720 struct rds_message *rds_send_get_message(struct rds_connection *,
721 struct rm_rdma_op *);
724 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
725 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
726 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
727 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
728 void rds_rdma_drop_keys(struct rds_sock *rs);
729 int rds_rdma_extra_size(struct rds_rdma_args *args);
730 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
731 struct cmsghdr *cmsg);
732 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
733 struct cmsghdr *cmsg);
734 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
735 struct cmsghdr *cmsg);
736 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
737 struct cmsghdr *cmsg);
738 void rds_rdma_free_op(struct rm_rdma_op *ro);
739 void rds_atomic_free_op(struct rm_atomic_op *ao);
740 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
741 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
742 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
743 struct cmsghdr *cmsg);
745 void __rds_put_mr_final(struct rds_mr *mr);
746 static inline void rds_mr_put(struct rds_mr *mr)
748 if (atomic_dec_and_test(&mr->r_refcount))
749 __rds_put_mr_final(mr);
753 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
754 #define rds_stats_inc_which(which, member) do { \
755 per_cpu(which, get_cpu()).member++; \
758 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
759 #define rds_stats_add_which(which, member, count) do { \
760 per_cpu(which, get_cpu()).member += count; \
763 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
764 int rds_stats_init(void);
765 void rds_stats_exit(void);
766 void rds_stats_info_copy(struct rds_info_iterator *iter,
767 uint64_t *values, const char *const *names,
771 int rds_sysctl_init(void);
772 void rds_sysctl_exit(void);
773 extern unsigned long rds_sysctl_sndbuf_min;
774 extern unsigned long rds_sysctl_sndbuf_default;
775 extern unsigned long rds_sysctl_sndbuf_max;
776 extern unsigned long rds_sysctl_reconnect_min_jiffies;
777 extern unsigned long rds_sysctl_reconnect_max_jiffies;
778 extern unsigned int rds_sysctl_max_unacked_packets;
779 extern unsigned int rds_sysctl_max_unacked_bytes;
780 extern unsigned int rds_sysctl_ping_enable;
781 extern unsigned long rds_sysctl_trace_flags;
782 extern unsigned int rds_sysctl_trace_level;
785 int rds_threads_init(void);
786 void rds_threads_exit(void);
787 extern struct workqueue_struct *rds_wq;
788 void rds_queue_reconnect(struct rds_connection *conn);
789 void rds_connect_worker(struct work_struct *);
790 void rds_shutdown_worker(struct work_struct *);
791 void rds_send_worker(struct work_struct *);
792 void rds_recv_worker(struct work_struct *);
793 void rds_connect_complete(struct rds_connection *conn);
796 int rds_trans_register(struct rds_transport *trans);
797 void rds_trans_unregister(struct rds_transport *trans);
798 struct rds_transport *rds_trans_get_preferred(__be32 addr);
799 void rds_trans_put(struct rds_transport *trans);
800 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
802 struct rds_transport *rds_trans_get(int t_type);
803 int rds_trans_init(void);
804 void rds_trans_exit(void);