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 struct rds_connection {
88 struct hlist_node c_hash_node;
91 unsigned int c_loopback:1,
94 struct rds_connection *c_passive;
96 struct rds_cong_map *c_lcong;
97 struct rds_cong_map *c_fcong;
99 struct rds_message *c_xmit_rm;
100 unsigned long c_xmit_sg;
101 unsigned int c_xmit_hdr_off;
102 unsigned int c_xmit_data_off;
103 unsigned int c_xmit_atomic_sent;
104 unsigned int c_xmit_rdma_sent;
105 unsigned int c_xmit_data_sent;
107 spinlock_t c_lock; /* protect msg queues */
109 struct list_head c_send_queue;
110 struct list_head c_retrans;
114 struct rds_transport *c_trans;
115 void *c_transport_data;
118 unsigned long c_send_gen;
119 unsigned long c_flags;
120 unsigned long c_reconnect_jiffies;
121 struct delayed_work c_send_w;
122 struct delayed_work c_recv_w;
123 struct delayed_work c_conn_w;
124 struct work_struct c_down_w;
125 struct mutex c_cm_lock; /* protect conn state & cm */
126 wait_queue_head_t c_waitq;
128 struct list_head c_map_item;
129 unsigned long c_map_queued;
131 unsigned int c_unacked_packets;
132 unsigned int c_unacked_bytes;
134 /* Protocol version */
135 unsigned int c_version;
136 possible_net_t c_net;
140 struct net *rds_conn_net(struct rds_connection *conn)
142 return read_pnet(&conn->c_net);
146 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
148 write_pnet(&conn->c_net, net);
151 #define RDS_FLAG_CONG_BITMAP 0x01
152 #define RDS_FLAG_ACK_REQUIRED 0x02
153 #define RDS_FLAG_RETRANSMITTED 0x04
154 #define RDS_MAX_ADV_CREDIT 255
157 * Maximum space available for extension headers.
159 #define RDS_HEADER_EXT_SPACE 16
172 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
176 * Reserved - indicates end of extensions
178 #define RDS_EXTHDR_NONE 0
181 * This extension header is included in the very
182 * first message that is sent on a new connection,
183 * and identifies the protocol level. This will help
184 * rolling updates if a future change requires breaking
186 * NB: This is no longer true for IB, where we do a version
187 * negotiation during the connection setup phase (protocol
188 * version information is included in the RDMA CM private data).
190 #define RDS_EXTHDR_VERSION 1
191 struct rds_ext_header_version {
196 * This extension header is included in the RDS message
197 * chasing an RDMA operation.
199 #define RDS_EXTHDR_RDMA 2
200 struct rds_ext_header_rdma {
205 * This extension header tells the peer about the
206 * destination <R_Key,offset> of the requested RDMA
209 #define RDS_EXTHDR_RDMA_DEST 3
210 struct rds_ext_header_rdma_dest {
212 __be32 h_rdma_offset;
215 #define __RDS_EXTHDR_MAX 16 /* for now */
217 struct rds_incoming {
219 struct list_head i_item;
220 struct rds_connection *i_conn;
221 struct rds_header i_hdr;
222 unsigned long i_rx_jiffies;
225 rds_rdma_cookie_t i_rdma_cookie;
226 struct timeval i_rx_tstamp;
230 struct rb_node r_rb_node;
234 /* A copy of the creation flags */
235 unsigned int r_use_once:1;
236 unsigned int r_invalidate:1;
237 unsigned int r_write:1;
239 /* This is for RDS_MR_DEAD.
240 * It would be nice & consistent to make this part of the above
241 * bit field here, but we need to use test_and_set_bit.
243 unsigned long r_state;
244 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
245 struct rds_transport *r_trans;
246 void *r_trans_private;
249 /* Flags for mr->r_state */
250 #define RDS_MR_DEAD 0
252 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
254 return r_key | (((u64) offset) << 32);
257 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
262 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
267 /* atomic operation types */
268 #define RDS_ATOMIC_TYPE_CSWP 0
269 #define RDS_ATOMIC_TYPE_FADD 1
272 * m_sock_item and m_conn_item are on lists that are serialized under
273 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
274 * the message will not be put back on the retransmit list after being sent.
275 * messages that are canceled while being sent rely on this.
277 * m_inc is used by loopback so that it can pass an incoming message straight
278 * back up into the rx path. It embeds a wire header which is also used by
279 * the send path, which is kind of awkward.
281 * m_sock_item indicates the message's presence on a socket's send or receive
282 * queue. m_rs will point to that socket.
284 * m_daddr is used by cancellation to prune messages to a given destination.
286 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
287 * nesting. As paths iterate over messages on a sock, or conn, they must
288 * also lock the conn, or sock, to remove the message from those lists too.
289 * Testing the flag to determine if the message is still on the lists lets
290 * us avoid testing the list_head directly. That means each path can use
291 * the message's list_head to keep it on a local list while juggling locks
292 * without confusing the other path.
294 * m_ack_seq is an optional field set by transports who need a different
295 * sequence number range to invalidate. They can use this in a callback
296 * that they pass to rds_send_drop_acked() to see if each message has been
297 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
298 * had ack_seq set yet.
300 #define RDS_MSG_ON_SOCK 1
301 #define RDS_MSG_ON_CONN 2
302 #define RDS_MSG_HAS_ACK_SEQ 3
303 #define RDS_MSG_ACK_REQUIRED 4
304 #define RDS_MSG_RETRANSMITTED 5
305 #define RDS_MSG_MAPPED 6
306 #define RDS_MSG_PAGEVEC 7
310 struct list_head m_sock_item;
311 struct list_head m_conn_item;
312 struct rds_incoming m_inc;
315 unsigned long m_flags;
317 /* Never access m_rs without holding m_rs_lock.
322 spinlock_t m_rs_lock;
323 wait_queue_head_t m_flush_wait;
325 struct rds_sock *m_rs;
327 /* cookie to send to remote, in rds header */
328 rds_rdma_cookie_t m_rdma_cookie;
330 unsigned int m_used_sgs;
331 unsigned int m_total_sgs;
336 struct rm_atomic_op {
342 uint64_t compare_mask;
347 uint64_t nocarry_mask;
353 unsigned int op_notify:1;
354 unsigned int op_recverr:1;
355 unsigned int op_mapped:1;
356 unsigned int op_silent:1;
357 unsigned int op_active:1;
358 struct scatterlist *op_sg;
359 struct rds_notifier *op_notifier;
361 struct rds_mr *op_rdma_mr;
366 unsigned int op_write:1;
367 unsigned int op_fence:1;
368 unsigned int op_notify:1;
369 unsigned int op_recverr:1;
370 unsigned int op_mapped:1;
371 unsigned int op_silent:1;
372 unsigned int op_active:1;
373 unsigned int op_bytes;
374 unsigned int op_nents;
375 unsigned int op_count;
376 struct scatterlist *op_sg;
377 struct rds_notifier *op_notifier;
379 struct rds_mr *op_rdma_mr;
382 unsigned int op_active:1;
383 unsigned int op_nents;
384 unsigned int op_count;
385 unsigned int op_dmasg;
386 unsigned int op_dmaoff;
387 struct scatterlist *op_sg;
393 * The RDS notifier is used (optionally) to tell the application about
394 * completed RDMA operations. Rather than keeping the whole rds message
395 * around on the queue, we allocate a small notifier that is put on the
396 * socket's notifier_list. Notifications are delivered to the application
397 * through control messages.
399 struct rds_notifier {
400 struct list_head n_list;
401 uint64_t n_user_token;
406 * struct rds_transport - transport specific behavioural hooks
408 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
409 * part of a message. The caller serializes on the send_sem so this
410 * doesn't need to be reentrant for a given conn. The header must be
411 * sent before the data payload. .xmit must be prepared to send a
412 * message with no data payload. .xmit should return the number of
413 * bytes that were sent down the connection, including header bytes.
414 * Returning 0 tells the caller that it doesn't need to perform any
415 * additional work now. This is usually the case when the transport has
416 * filled the sending queue for its connection and will handle
417 * triggering the rds thread to continue the send when space becomes
418 * available. Returning -EAGAIN tells the caller to retry the send
419 * immediately. Returning -ENOMEM tells the caller to retry the send at
420 * some point in the future.
422 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
423 * it returns the connection can not call rds_recv_incoming().
424 * This will only be called once after conn_connect returns
425 * non-zero success and will The caller serializes this with
426 * the send and connecting paths (xmit_* and conn_*). The
427 * transport is responsible for other serialization, including
428 * rds_recv_incoming(). This is called in process context but
429 * should try hard not to block.
432 struct rds_transport {
433 char t_name[TRANSNAMSIZ];
434 struct list_head t_item;
435 struct module *t_owner;
436 unsigned int t_prefer_loopback:1;
439 int (*laddr_check)(struct net *net, __be32 addr);
440 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
441 void (*conn_free)(void *data);
442 int (*conn_connect)(struct rds_connection *conn);
443 void (*conn_shutdown)(struct rds_connection *conn);
444 void (*xmit_prepare)(struct rds_connection *conn);
445 void (*xmit_complete)(struct rds_connection *conn);
446 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
447 unsigned int hdr_off, unsigned int sg, unsigned int off);
448 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
449 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
450 int (*recv)(struct rds_connection *conn);
451 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
452 void (*inc_free)(struct rds_incoming *inc);
454 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
455 struct rdma_cm_event *event);
456 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
457 void (*cm_connect_complete)(struct rds_connection *conn,
458 struct rdma_cm_event *event);
460 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
463 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
464 struct rds_sock *rs, u32 *key_ret);
465 void (*sync_mr)(void *trans_private, int direction);
466 void (*free_mr)(void *trans_private, int invalidate);
467 void (*flush_mrs)(void);
477 * bound_addr used for both incoming and outgoing, no INADDR_ANY
480 struct rhash_head rs_bound_node;
482 __be32 rs_bound_addr;
484 __be16 rs_bound_port;
486 struct rds_transport *rs_transport;
489 * rds_sendmsg caches the conn it used the last time around.
490 * This helps avoid costly lookups.
492 struct rds_connection *rs_conn;
494 /* flag indicating we were congested or not */
496 /* seen congestion (ENOBUFS) when sending? */
497 int rs_seen_congestion;
499 /* rs_lock protects all these adjacent members before the newline */
501 struct list_head rs_send_queue;
504 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
506 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
507 * to decide whether the application should be woken up.
508 * If not set, we use rs_cong_track to find out whether a cong map
511 uint64_t rs_cong_mask;
512 uint64_t rs_cong_notify;
513 struct list_head rs_cong_list;
514 unsigned long rs_cong_track;
517 * rs_recv_lock protects the receive queue, and is
518 * used to serialize with rds_release.
520 rwlock_t rs_recv_lock;
521 struct list_head rs_recv_queue;
523 /* just for stats reporting */
524 struct list_head rs_item;
526 /* these have their own lock */
527 spinlock_t rs_rdma_lock;
528 struct rb_root rs_rdma_keys;
530 /* Socket options - in case there will be more */
531 unsigned char rs_recverr,
535 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
537 return container_of(sk, struct rds_sock, rs_sk);
539 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
545 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
546 * to account for overhead. We don't account for overhead, we just apply
547 * the number of payload bytes to the specified value.
549 static inline int rds_sk_sndbuf(struct rds_sock *rs)
551 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
553 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
555 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
558 struct rds_statistics {
559 uint64_t s_conn_reset;
560 uint64_t s_recv_drop_bad_checksum;
561 uint64_t s_recv_drop_old_seq;
562 uint64_t s_recv_drop_no_sock;
563 uint64_t s_recv_drop_dead_sock;
564 uint64_t s_recv_deliver_raced;
565 uint64_t s_recv_delivered;
566 uint64_t s_recv_queued;
567 uint64_t s_recv_immediate_retry;
568 uint64_t s_recv_delayed_retry;
569 uint64_t s_recv_ack_required;
570 uint64_t s_recv_rdma_bytes;
571 uint64_t s_recv_ping;
572 uint64_t s_send_queue_empty;
573 uint64_t s_send_queue_full;
574 uint64_t s_send_lock_contention;
575 uint64_t s_send_lock_queue_raced;
576 uint64_t s_send_immediate_retry;
577 uint64_t s_send_delayed_retry;
578 uint64_t s_send_drop_acked;
579 uint64_t s_send_ack_required;
580 uint64_t s_send_queued;
581 uint64_t s_send_rdma;
582 uint64_t s_send_rdma_bytes;
583 uint64_t s_send_pong;
584 uint64_t s_page_remainder_hit;
585 uint64_t s_page_remainder_miss;
586 uint64_t s_copy_to_user;
587 uint64_t s_copy_from_user;
588 uint64_t s_cong_update_queued;
589 uint64_t s_cong_update_received;
590 uint64_t s_cong_send_error;
591 uint64_t s_cong_send_blocked;
595 void rds_sock_addref(struct rds_sock *rs);
596 void rds_sock_put(struct rds_sock *rs);
597 void rds_wake_sk_sleep(struct rds_sock *rs);
598 static inline void __rds_wake_sk_sleep(struct sock *sk)
600 wait_queue_head_t *waitq = sk_sleep(sk);
602 if (!sock_flag(sk, SOCK_DEAD) && waitq)
605 extern wait_queue_head_t rds_poll_waitq;
609 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
610 void rds_remove_bound(struct rds_sock *rs);
611 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
612 int rds_bind_lock_init(void);
613 void rds_bind_lock_destroy(void);
616 int rds_cong_get_maps(struct rds_connection *conn);
617 void rds_cong_add_conn(struct rds_connection *conn);
618 void rds_cong_remove_conn(struct rds_connection *conn);
619 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
620 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
621 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
622 void rds_cong_queue_updates(struct rds_cong_map *map);
623 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
624 int rds_cong_updated_since(unsigned long *recent);
625 void rds_cong_add_socket(struct rds_sock *);
626 void rds_cong_remove_socket(struct rds_sock *);
627 void rds_cong_exit(void);
628 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
631 int rds_conn_init(void);
632 void rds_conn_exit(void);
633 struct rds_connection *rds_conn_create(struct net *net,
634 __be32 laddr, __be32 faddr,
635 struct rds_transport *trans, gfp_t gfp);
636 struct rds_connection *rds_conn_create_outgoing(struct net *net,
637 __be32 laddr, __be32 faddr,
638 struct rds_transport *trans, gfp_t gfp);
639 void rds_conn_shutdown(struct rds_connection *conn);
640 void rds_conn_destroy(struct rds_connection *conn);
641 void rds_conn_drop(struct rds_connection *conn);
642 void rds_conn_connect_if_down(struct rds_connection *conn);
643 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
644 struct rds_info_iterator *iter,
645 struct rds_info_lengths *lens,
646 int (*visitor)(struct rds_connection *, void *),
649 void __rds_conn_error(struct rds_connection *conn, const char *, ...);
650 #define rds_conn_error(conn, fmt...) \
651 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
654 rds_conn_transition(struct rds_connection *conn, int old, int new)
656 return atomic_cmpxchg(&conn->c_state, old, new) == old;
660 rds_conn_state(struct rds_connection *conn)
662 return atomic_read(&conn->c_state);
666 rds_conn_up(struct rds_connection *conn)
668 return atomic_read(&conn->c_state) == RDS_CONN_UP;
672 rds_conn_connecting(struct rds_connection *conn)
674 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
678 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
679 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
680 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
681 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
682 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
683 __be16 dport, u64 seq);
684 int rds_message_add_extension(struct rds_header *hdr,
685 unsigned int type, const void *data, unsigned int len);
686 int rds_message_next_extension(struct rds_header *hdr,
687 unsigned int *pos, void *buf, unsigned int *buflen);
688 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
689 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
690 void rds_message_inc_free(struct rds_incoming *inc);
691 void rds_message_addref(struct rds_message *rm);
692 void rds_message_put(struct rds_message *rm);
693 void rds_message_wait(struct rds_message *rm);
694 void rds_message_unmapped(struct rds_message *rm);
696 static inline void rds_message_make_checksum(struct rds_header *hdr)
699 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
702 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
704 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
709 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
711 int rds_page_copy_user(struct page *page, unsigned long offset,
712 void __user *ptr, unsigned long bytes,
714 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
715 rds_page_copy_user(page, offset, ptr, bytes, 1)
716 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
717 rds_page_copy_user(page, offset, ptr, bytes, 0)
718 void rds_page_exit(void);
721 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
723 void rds_inc_put(struct rds_incoming *inc);
724 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
725 struct rds_incoming *inc, gfp_t gfp);
726 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
728 void rds_clear_recv_queue(struct rds_sock *rs);
729 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
730 void rds_inc_info_copy(struct rds_incoming *inc,
731 struct rds_info_iterator *iter,
732 __be32 saddr, __be32 daddr, int flip);
735 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
736 void rds_send_reset(struct rds_connection *conn);
737 int rds_send_xmit(struct rds_connection *conn);
739 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
740 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
741 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
742 is_acked_func is_acked);
743 int rds_send_pong(struct rds_connection *conn, __be16 dport);
744 struct rds_message *rds_send_get_message(struct rds_connection *,
745 struct rm_rdma_op *);
748 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
749 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
750 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
751 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
752 void rds_rdma_drop_keys(struct rds_sock *rs);
753 int rds_rdma_extra_size(struct rds_rdma_args *args);
754 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
755 struct cmsghdr *cmsg);
756 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
757 struct cmsghdr *cmsg);
758 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
759 struct cmsghdr *cmsg);
760 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
761 struct cmsghdr *cmsg);
762 void rds_rdma_free_op(struct rm_rdma_op *ro);
763 void rds_atomic_free_op(struct rm_atomic_op *ao);
764 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
765 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
766 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
767 struct cmsghdr *cmsg);
769 void __rds_put_mr_final(struct rds_mr *mr);
770 static inline void rds_mr_put(struct rds_mr *mr)
772 if (atomic_dec_and_test(&mr->r_refcount))
773 __rds_put_mr_final(mr);
777 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
778 #define rds_stats_inc_which(which, member) do { \
779 per_cpu(which, get_cpu()).member++; \
782 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
783 #define rds_stats_add_which(which, member, count) do { \
784 per_cpu(which, get_cpu()).member += count; \
787 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
788 int rds_stats_init(void);
789 void rds_stats_exit(void);
790 void rds_stats_info_copy(struct rds_info_iterator *iter,
791 uint64_t *values, const char *const *names,
795 int rds_sysctl_init(void);
796 void rds_sysctl_exit(void);
797 extern unsigned long rds_sysctl_sndbuf_min;
798 extern unsigned long rds_sysctl_sndbuf_default;
799 extern unsigned long rds_sysctl_sndbuf_max;
800 extern unsigned long rds_sysctl_reconnect_min_jiffies;
801 extern unsigned long rds_sysctl_reconnect_max_jiffies;
802 extern unsigned int rds_sysctl_max_unacked_packets;
803 extern unsigned int rds_sysctl_max_unacked_bytes;
804 extern unsigned int rds_sysctl_ping_enable;
805 extern unsigned long rds_sysctl_trace_flags;
806 extern unsigned int rds_sysctl_trace_level;
809 int rds_threads_init(void);
810 void rds_threads_exit(void);
811 extern struct workqueue_struct *rds_wq;
812 void rds_queue_reconnect(struct rds_connection *conn);
813 void rds_connect_worker(struct work_struct *);
814 void rds_shutdown_worker(struct work_struct *);
815 void rds_send_worker(struct work_struct *);
816 void rds_recv_worker(struct work_struct *);
817 void rds_connect_path_complete(struct rds_connection *conn, int curr);
818 void rds_connect_complete(struct rds_connection *conn);
821 int rds_trans_register(struct rds_transport *trans);
822 void rds_trans_unregister(struct rds_transport *trans);
823 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
824 void rds_trans_put(struct rds_transport *trans);
825 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
827 struct rds_transport *rds_trans_get(int t_type);
828 int rds_trans_init(void);
829 void rds_trans_exit(void);