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>
11 #include <linux/refcount.h>
16 * RDS Network protocol version
18 #define RDS_PROTOCOL_3_0 0x0300
19 #define RDS_PROTOCOL_3_1 0x0301
20 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1
21 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8)
22 #define RDS_PROTOCOL_MINOR(v) ((v) & 255)
23 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min)
26 * XXX randomly chosen, but at least seems to be unused:
27 * # 18464-18768 Unassigned
28 * We should do better. We want a reserved port to discourage unpriv'ed
29 * userspace from listening.
31 #define RDS_PORT 18634
34 #define KERNEL_HAS_ATOMIC64
38 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
40 /* sigh, pr_debug() causes unused variable warnings */
41 static inline __printf(1, 2)
42 void rdsdebug(char *fmt, ...)
47 /* XXX is there one of these somewhere? */
49 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
51 #define RDS_FRAG_SHIFT 12
52 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
54 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */
55 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20))
57 #define RDS_CONG_MAP_BYTES (65536 / 8)
58 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
59 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
62 struct rb_node m_rb_node;
64 wait_queue_head_t m_waitq;
65 struct list_head m_conn_list;
66 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES];
71 * This is how we will track the connection state:
72 * A connection is always in one of the following
73 * states. Updates to the state are atomic and imply
79 RDS_CONN_DISCONNECTING,
85 /* Bits for c_flags */
86 #define RDS_LL_SEND_FULL 0
87 #define RDS_RECONNECT_PENDING 1
89 #define RDS_RECV_REFILL 3
91 /* Max number of multipaths per RDS connection. Must be a power of 2 */
92 #define RDS_MPATH_WORKERS 8
93 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
94 (rs)->rs_hash_initval) & ((n) - 1))
96 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr))
98 /* Per mpath connection state */
99 struct rds_conn_path {
100 struct rds_connection *cp_conn;
101 struct rds_message *cp_xmit_rm;
102 unsigned long cp_xmit_sg;
103 unsigned int cp_xmit_hdr_off;
104 unsigned int cp_xmit_data_off;
105 unsigned int cp_xmit_atomic_sent;
106 unsigned int cp_xmit_rdma_sent;
107 unsigned int cp_xmit_data_sent;
109 spinlock_t cp_lock; /* protect msg queues */
111 struct list_head cp_send_queue;
112 struct list_head cp_retrans;
116 void *cp_transport_data;
119 unsigned long cp_send_gen;
120 unsigned long cp_flags;
121 unsigned long cp_reconnect_jiffies;
122 struct delayed_work cp_send_w;
123 struct delayed_work cp_recv_w;
124 struct delayed_work cp_conn_w;
125 struct work_struct cp_down_w;
126 struct mutex cp_cm_lock; /* protect cp_state & cm */
127 wait_queue_head_t cp_waitq;
129 unsigned int cp_unacked_packets;
130 unsigned int cp_unacked_bytes;
131 unsigned int cp_index;
134 /* One rds_connection per RDS address pair */
135 struct rds_connection {
136 struct hlist_node c_hash_node;
139 unsigned int c_loopback:1,
144 struct rds_connection *c_passive;
145 struct rds_transport *c_trans;
147 struct rds_cong_map *c_lcong;
148 struct rds_cong_map *c_fcong;
150 /* Protocol version */
151 unsigned int c_version;
154 struct list_head c_map_item;
155 unsigned long c_map_queued;
157 struct rds_conn_path c_path[RDS_MPATH_WORKERS];
158 wait_queue_head_t c_hs_waitq; /* handshake waitq */
165 struct net *rds_conn_net(struct rds_connection *conn)
171 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
173 conn->c_net = get_net(net);
176 #define RDS_FLAG_CONG_BITMAP 0x01
177 #define RDS_FLAG_ACK_REQUIRED 0x02
178 #define RDS_FLAG_RETRANSMITTED 0x04
179 #define RDS_MAX_ADV_CREDIT 255
181 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
182 * probe to exchange control information before establishing a connection.
183 * Currently the control information that is exchanged is the number of
184 * supported paths. If the peer is a legacy (older kernel revision) peer,
185 * it would return a pong message without additional control information
186 * that would then alert the sender that the peer was an older rev.
188 #define RDS_FLAG_PROBE_PORT 1
189 #define RDS_HS_PROBE(sport, dport) \
190 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
191 (sport == 0 && dport == RDS_FLAG_PROBE_PORT))
193 * Maximum space available for extension headers.
195 #define RDS_HEADER_EXT_SPACE 16
208 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
212 * Reserved - indicates end of extensions
214 #define RDS_EXTHDR_NONE 0
217 * This extension header is included in the very
218 * first message that is sent on a new connection,
219 * and identifies the protocol level. This will help
220 * rolling updates if a future change requires breaking
222 * NB: This is no longer true for IB, where we do a version
223 * negotiation during the connection setup phase (protocol
224 * version information is included in the RDMA CM private data).
226 #define RDS_EXTHDR_VERSION 1
227 struct rds_ext_header_version {
232 * This extension header is included in the RDS message
233 * chasing an RDMA operation.
235 #define RDS_EXTHDR_RDMA 2
236 struct rds_ext_header_rdma {
241 * This extension header tells the peer about the
242 * destination <R_Key,offset> of the requested RDMA
245 #define RDS_EXTHDR_RDMA_DEST 3
246 struct rds_ext_header_rdma_dest {
248 __be32 h_rdma_offset;
251 /* Extension header announcing number of paths.
252 * Implicit length = 2 bytes.
254 #define RDS_EXTHDR_NPATHS 5
255 #define RDS_EXTHDR_GEN_NUM 6
257 #define __RDS_EXTHDR_MAX 16 /* for now */
258 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1)
259 #define RDS_MSG_RX_HDR 0
260 #define RDS_MSG_RX_START 1
261 #define RDS_MSG_RX_END 2
262 #define RDS_MSG_RX_CMSG 3
264 struct rds_incoming {
265 refcount_t i_refcount;
266 struct list_head i_item;
267 struct rds_connection *i_conn;
268 struct rds_conn_path *i_conn_path;
269 struct rds_header i_hdr;
270 unsigned long i_rx_jiffies;
273 rds_rdma_cookie_t i_rdma_cookie;
274 struct timeval i_rx_tstamp;
275 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES];
279 struct rb_node r_rb_node;
280 refcount_t r_refcount;
283 /* A copy of the creation flags */
284 unsigned int r_use_once:1;
285 unsigned int r_invalidate:1;
286 unsigned int r_write:1;
288 /* This is for RDS_MR_DEAD.
289 * It would be nice & consistent to make this part of the above
290 * bit field here, but we need to use test_and_set_bit.
292 unsigned long r_state;
293 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
294 struct rds_transport *r_trans;
295 void *r_trans_private;
298 /* Flags for mr->r_state */
299 #define RDS_MR_DEAD 0
301 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
303 return r_key | (((u64) offset) << 32);
306 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
311 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
316 /* atomic operation types */
317 #define RDS_ATOMIC_TYPE_CSWP 0
318 #define RDS_ATOMIC_TYPE_FADD 1
321 * m_sock_item and m_conn_item are on lists that are serialized under
322 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
323 * the message will not be put back on the retransmit list after being sent.
324 * messages that are canceled while being sent rely on this.
326 * m_inc is used by loopback so that it can pass an incoming message straight
327 * back up into the rx path. It embeds a wire header which is also used by
328 * the send path, which is kind of awkward.
330 * m_sock_item indicates the message's presence on a socket's send or receive
331 * queue. m_rs will point to that socket.
333 * m_daddr is used by cancellation to prune messages to a given destination.
335 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
336 * nesting. As paths iterate over messages on a sock, or conn, they must
337 * also lock the conn, or sock, to remove the message from those lists too.
338 * Testing the flag to determine if the message is still on the lists lets
339 * us avoid testing the list_head directly. That means each path can use
340 * the message's list_head to keep it on a local list while juggling locks
341 * without confusing the other path.
343 * m_ack_seq is an optional field set by transports who need a different
344 * sequence number range to invalidate. They can use this in a callback
345 * that they pass to rds_send_drop_acked() to see if each message has been
346 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
347 * had ack_seq set yet.
349 #define RDS_MSG_ON_SOCK 1
350 #define RDS_MSG_ON_CONN 2
351 #define RDS_MSG_HAS_ACK_SEQ 3
352 #define RDS_MSG_ACK_REQUIRED 4
353 #define RDS_MSG_RETRANSMITTED 5
354 #define RDS_MSG_MAPPED 6
355 #define RDS_MSG_PAGEVEC 7
356 #define RDS_MSG_FLUSH 8
359 refcount_t m_refcount;
360 struct list_head m_sock_item;
361 struct list_head m_conn_item;
362 struct rds_incoming m_inc;
365 unsigned long m_flags;
367 /* Never access m_rs without holding m_rs_lock.
372 spinlock_t m_rs_lock;
373 wait_queue_head_t m_flush_wait;
375 struct rds_sock *m_rs;
377 /* cookie to send to remote, in rds header */
378 rds_rdma_cookie_t m_rdma_cookie;
380 unsigned int m_used_sgs;
381 unsigned int m_total_sgs;
386 struct rm_atomic_op {
392 uint64_t compare_mask;
397 uint64_t nocarry_mask;
403 unsigned int op_notify:1;
404 unsigned int op_recverr:1;
405 unsigned int op_mapped:1;
406 unsigned int op_silent:1;
407 unsigned int op_active:1;
408 struct scatterlist *op_sg;
409 struct rds_notifier *op_notifier;
411 struct rds_mr *op_rdma_mr;
416 unsigned int op_write:1;
417 unsigned int op_fence:1;
418 unsigned int op_notify:1;
419 unsigned int op_recverr:1;
420 unsigned int op_mapped:1;
421 unsigned int op_silent:1;
422 unsigned int op_active:1;
423 unsigned int op_bytes;
424 unsigned int op_nents;
425 unsigned int op_count;
426 struct scatterlist *op_sg;
427 struct rds_notifier *op_notifier;
429 struct rds_mr *op_rdma_mr;
432 unsigned int op_active:1;
433 unsigned int op_notify:1;
434 unsigned int op_nents;
435 unsigned int op_count;
436 unsigned int op_dmasg;
437 unsigned int op_dmaoff;
438 struct scatterlist *op_sg;
444 * The RDS notifier is used (optionally) to tell the application about
445 * completed RDMA operations. Rather than keeping the whole rds message
446 * around on the queue, we allocate a small notifier that is put on the
447 * socket's notifier_list. Notifications are delivered to the application
448 * through control messages.
450 struct rds_notifier {
451 struct list_head n_list;
452 uint64_t n_user_token;
457 * struct rds_transport - transport specific behavioural hooks
459 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
460 * part of a message. The caller serializes on the send_sem so this
461 * doesn't need to be reentrant for a given conn. The header must be
462 * sent before the data payload. .xmit must be prepared to send a
463 * message with no data payload. .xmit should return the number of
464 * bytes that were sent down the connection, including header bytes.
465 * Returning 0 tells the caller that it doesn't need to perform any
466 * additional work now. This is usually the case when the transport has
467 * filled the sending queue for its connection and will handle
468 * triggering the rds thread to continue the send when space becomes
469 * available. Returning -EAGAIN tells the caller to retry the send
470 * immediately. Returning -ENOMEM tells the caller to retry the send at
471 * some point in the future.
473 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
474 * it returns the connection can not call rds_recv_incoming().
475 * This will only be called once after conn_connect returns
476 * non-zero success and will The caller serializes this with
477 * the send and connecting paths (xmit_* and conn_*). The
478 * transport is responsible for other serialization, including
479 * rds_recv_incoming(). This is called in process context but
480 * should try hard not to block.
483 struct rds_transport {
484 char t_name[TRANSNAMSIZ];
485 struct list_head t_item;
486 struct module *t_owner;
487 unsigned int t_prefer_loopback:1,
491 int (*laddr_check)(struct net *net, __be32 addr);
492 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
493 void (*conn_free)(void *data);
494 int (*conn_path_connect)(struct rds_conn_path *cp);
495 void (*conn_path_shutdown)(struct rds_conn_path *conn);
496 void (*xmit_path_prepare)(struct rds_conn_path *cp);
497 void (*xmit_path_complete)(struct rds_conn_path *cp);
498 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
499 unsigned int hdr_off, unsigned int sg, unsigned int off);
500 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
501 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
502 int (*recv_path)(struct rds_conn_path *cp);
503 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
504 void (*inc_free)(struct rds_incoming *inc);
506 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
507 struct rdma_cm_event *event);
508 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
509 void (*cm_connect_complete)(struct rds_connection *conn,
510 struct rdma_cm_event *event);
512 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
515 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
516 struct rds_sock *rs, u32 *key_ret);
517 void (*sync_mr)(void *trans_private, int direction);
518 void (*free_mr)(void *trans_private, int invalidate);
519 void (*flush_mrs)(void);
529 * bound_addr used for both incoming and outgoing, no INADDR_ANY
532 struct rhash_head rs_bound_node;
534 __be32 rs_bound_addr;
536 __be16 rs_bound_port;
538 struct rds_transport *rs_transport;
541 * rds_sendmsg caches the conn it used the last time around.
542 * This helps avoid costly lookups.
544 struct rds_connection *rs_conn;
546 /* flag indicating we were congested or not */
548 /* seen congestion (ENOBUFS) when sending? */
549 int rs_seen_congestion;
551 /* rs_lock protects all these adjacent members before the newline */
553 struct list_head rs_send_queue;
556 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
558 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
559 * to decide whether the application should be woken up.
560 * If not set, we use rs_cong_track to find out whether a cong map
563 uint64_t rs_cong_mask;
564 uint64_t rs_cong_notify;
565 struct list_head rs_cong_list;
566 unsigned long rs_cong_track;
569 * rs_recv_lock protects the receive queue, and is
570 * used to serialize with rds_release.
572 rwlock_t rs_recv_lock;
573 struct list_head rs_recv_queue;
575 /* just for stats reporting */
576 struct list_head rs_item;
578 /* these have their own lock */
579 spinlock_t rs_rdma_lock;
580 struct rb_root rs_rdma_keys;
582 /* Socket options - in case there will be more */
583 unsigned char rs_recverr,
587 /* Socket receive path trace points*/
589 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
592 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
594 return container_of(sk, struct rds_sock, rs_sk);
596 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
602 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
603 * to account for overhead. We don't account for overhead, we just apply
604 * the number of payload bytes to the specified value.
606 static inline int rds_sk_sndbuf(struct rds_sock *rs)
608 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
610 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
612 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
615 struct rds_statistics {
616 uint64_t s_conn_reset;
617 uint64_t s_recv_drop_bad_checksum;
618 uint64_t s_recv_drop_old_seq;
619 uint64_t s_recv_drop_no_sock;
620 uint64_t s_recv_drop_dead_sock;
621 uint64_t s_recv_deliver_raced;
622 uint64_t s_recv_delivered;
623 uint64_t s_recv_queued;
624 uint64_t s_recv_immediate_retry;
625 uint64_t s_recv_delayed_retry;
626 uint64_t s_recv_ack_required;
627 uint64_t s_recv_rdma_bytes;
628 uint64_t s_recv_ping;
629 uint64_t s_send_queue_empty;
630 uint64_t s_send_queue_full;
631 uint64_t s_send_lock_contention;
632 uint64_t s_send_lock_queue_raced;
633 uint64_t s_send_immediate_retry;
634 uint64_t s_send_delayed_retry;
635 uint64_t s_send_drop_acked;
636 uint64_t s_send_ack_required;
637 uint64_t s_send_queued;
638 uint64_t s_send_rdma;
639 uint64_t s_send_rdma_bytes;
640 uint64_t s_send_pong;
641 uint64_t s_page_remainder_hit;
642 uint64_t s_page_remainder_miss;
643 uint64_t s_copy_to_user;
644 uint64_t s_copy_from_user;
645 uint64_t s_cong_update_queued;
646 uint64_t s_cong_update_received;
647 uint64_t s_cong_send_error;
648 uint64_t s_cong_send_blocked;
649 uint64_t s_recv_bytes_added_to_socket;
650 uint64_t s_recv_bytes_removed_from_socket;
655 void rds_sock_addref(struct rds_sock *rs);
656 void rds_sock_put(struct rds_sock *rs);
657 void rds_wake_sk_sleep(struct rds_sock *rs);
658 static inline void __rds_wake_sk_sleep(struct sock *sk)
660 wait_queue_head_t *waitq = sk_sleep(sk);
662 if (!sock_flag(sk, SOCK_DEAD) && waitq)
665 extern wait_queue_head_t rds_poll_waitq;
669 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
670 void rds_remove_bound(struct rds_sock *rs);
671 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
672 int rds_bind_lock_init(void);
673 void rds_bind_lock_destroy(void);
676 int rds_cong_get_maps(struct rds_connection *conn);
677 void rds_cong_add_conn(struct rds_connection *conn);
678 void rds_cong_remove_conn(struct rds_connection *conn);
679 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
680 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
681 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
682 void rds_cong_queue_updates(struct rds_cong_map *map);
683 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
684 int rds_cong_updated_since(unsigned long *recent);
685 void rds_cong_add_socket(struct rds_sock *);
686 void rds_cong_remove_socket(struct rds_sock *);
687 void rds_cong_exit(void);
688 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
691 extern u32 rds_gen_num;
692 int rds_conn_init(void);
693 void rds_conn_exit(void);
694 struct rds_connection *rds_conn_create(struct net *net,
695 __be32 laddr, __be32 faddr,
696 struct rds_transport *trans, gfp_t gfp);
697 struct rds_connection *rds_conn_create_outgoing(struct net *net,
698 __be32 laddr, __be32 faddr,
699 struct rds_transport *trans, gfp_t gfp);
700 void rds_conn_shutdown(struct rds_conn_path *cpath);
701 void rds_conn_destroy(struct rds_connection *conn);
702 void rds_conn_drop(struct rds_connection *conn);
703 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy);
704 void rds_conn_connect_if_down(struct rds_connection *conn);
705 void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
706 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
707 struct rds_info_iterator *iter,
708 struct rds_info_lengths *lens,
709 int (*visitor)(struct rds_connection *, void *),
713 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...);
714 #define rds_conn_path_error(cp, fmt...) \
715 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
718 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
720 return atomic_cmpxchg(&cp->cp_state, old, new) == old;
724 rds_conn_transition(struct rds_connection *conn, int old, int new)
726 WARN_ON(conn->c_trans->t_mp_capable);
727 return rds_conn_path_transition(&conn->c_path[0], old, new);
731 rds_conn_path_state(struct rds_conn_path *cp)
733 return atomic_read(&cp->cp_state);
737 rds_conn_state(struct rds_connection *conn)
739 WARN_ON(conn->c_trans->t_mp_capable);
740 return rds_conn_path_state(&conn->c_path[0]);
744 rds_conn_path_up(struct rds_conn_path *cp)
746 return atomic_read(&cp->cp_state) == RDS_CONN_UP;
750 rds_conn_up(struct rds_connection *conn)
752 WARN_ON(conn->c_trans->t_mp_capable);
753 return rds_conn_path_up(&conn->c_path[0]);
757 rds_conn_path_connecting(struct rds_conn_path *cp)
759 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
763 rds_conn_connecting(struct rds_connection *conn)
765 WARN_ON(conn->c_trans->t_mp_capable);
766 return rds_conn_path_connecting(&conn->c_path[0]);
770 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
771 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
772 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
773 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
774 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
775 __be16 dport, u64 seq);
776 int rds_message_add_extension(struct rds_header *hdr,
777 unsigned int type, const void *data, unsigned int len);
778 int rds_message_next_extension(struct rds_header *hdr,
779 unsigned int *pos, void *buf, unsigned int *buflen);
780 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
781 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
782 void rds_message_inc_free(struct rds_incoming *inc);
783 void rds_message_addref(struct rds_message *rm);
784 void rds_message_put(struct rds_message *rm);
785 void rds_message_wait(struct rds_message *rm);
786 void rds_message_unmapped(struct rds_message *rm);
788 static inline void rds_message_make_checksum(struct rds_header *hdr)
791 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
794 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
796 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
801 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
803 void rds_page_exit(void);
806 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
808 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
810 void rds_inc_put(struct rds_incoming *inc);
811 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
812 struct rds_incoming *inc, gfp_t gfp);
813 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
815 void rds_clear_recv_queue(struct rds_sock *rs);
816 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
817 void rds_inc_info_copy(struct rds_incoming *inc,
818 struct rds_info_iterator *iter,
819 __be32 saddr, __be32 daddr, int flip);
822 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
823 void rds_send_path_reset(struct rds_conn_path *conn);
824 int rds_send_xmit(struct rds_conn_path *cp);
826 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
827 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
828 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
829 is_acked_func is_acked);
830 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
831 is_acked_func is_acked);
832 void rds_send_ping(struct rds_connection *conn, int cp_index);
833 int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
836 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
837 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
838 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
839 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
840 void rds_rdma_drop_keys(struct rds_sock *rs);
841 int rds_rdma_extra_size(struct rds_rdma_args *args);
842 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
843 struct cmsghdr *cmsg);
844 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
845 struct cmsghdr *cmsg);
846 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
847 struct cmsghdr *cmsg);
848 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
849 struct cmsghdr *cmsg);
850 void rds_rdma_free_op(struct rm_rdma_op *ro);
851 void rds_atomic_free_op(struct rm_atomic_op *ao);
852 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
853 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
854 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
855 struct cmsghdr *cmsg);
857 void __rds_put_mr_final(struct rds_mr *mr);
858 static inline void rds_mr_put(struct rds_mr *mr)
860 if (refcount_dec_and_test(&mr->r_refcount))
861 __rds_put_mr_final(mr);
865 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
866 #define rds_stats_inc_which(which, member) do { \
867 per_cpu(which, get_cpu()).member++; \
870 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
871 #define rds_stats_add_which(which, member, count) do { \
872 per_cpu(which, get_cpu()).member += count; \
875 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
876 int rds_stats_init(void);
877 void rds_stats_exit(void);
878 void rds_stats_info_copy(struct rds_info_iterator *iter,
879 uint64_t *values, const char *const *names,
883 int rds_sysctl_init(void);
884 void rds_sysctl_exit(void);
885 extern unsigned long rds_sysctl_sndbuf_min;
886 extern unsigned long rds_sysctl_sndbuf_default;
887 extern unsigned long rds_sysctl_sndbuf_max;
888 extern unsigned long rds_sysctl_reconnect_min_jiffies;
889 extern unsigned long rds_sysctl_reconnect_max_jiffies;
890 extern unsigned int rds_sysctl_max_unacked_packets;
891 extern unsigned int rds_sysctl_max_unacked_bytes;
892 extern unsigned int rds_sysctl_ping_enable;
893 extern unsigned long rds_sysctl_trace_flags;
894 extern unsigned int rds_sysctl_trace_level;
897 int rds_threads_init(void);
898 void rds_threads_exit(void);
899 extern struct workqueue_struct *rds_wq;
900 void rds_queue_reconnect(struct rds_conn_path *cp);
901 void rds_connect_worker(struct work_struct *);
902 void rds_shutdown_worker(struct work_struct *);
903 void rds_send_worker(struct work_struct *);
904 void rds_recv_worker(struct work_struct *);
905 void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
906 void rds_connect_complete(struct rds_connection *conn);
909 void rds_trans_register(struct rds_transport *trans);
910 void rds_trans_unregister(struct rds_transport *trans);
911 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
912 void rds_trans_put(struct rds_transport *trans);
913 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
915 struct rds_transport *rds_trans_get(int t_type);
916 int rds_trans_init(void);
917 void rds_trans_exit(void);