1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/scatterlist.h>
7 #include <linux/highmem.h>
8 #include <rdma/rdma_cm.h>
9 #include <linux/mutex.h>
10 #include <linux/rds.h>
11 #include <linux/rhashtable.h>
12 #include <linux/refcount.h>
17 * RDS Network protocol version
19 #define RDS_PROTOCOL_3_0 0x0300
20 #define RDS_PROTOCOL_3_1 0x0301
21 #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1
22 #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8)
23 #define RDS_PROTOCOL_MINOR(v) ((v) & 255)
24 #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min)
27 * XXX randomly chosen, but at least seems to be unused:
28 * # 18464-18768 Unassigned
29 * We should do better. We want a reserved port to discourage unpriv'ed
30 * userspace from listening.
32 #define RDS_PORT 18634
35 #define KERNEL_HAS_ATOMIC64
39 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
41 /* sigh, pr_debug() causes unused variable warnings */
42 static inline __printf(1, 2)
43 void rdsdebug(char *fmt, ...)
48 /* XXX is there one of these somewhere? */
50 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
52 #define RDS_FRAG_SHIFT 12
53 #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
55 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */
56 #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20))
58 #define RDS_CONG_MAP_BYTES (65536 / 8)
59 #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
60 #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
63 struct rb_node m_rb_node;
65 wait_queue_head_t m_waitq;
66 struct list_head m_conn_list;
67 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES];
72 * This is how we will track the connection state:
73 * A connection is always in one of the following
74 * states. Updates to the state are atomic and imply
80 RDS_CONN_DISCONNECTING,
86 /* Bits for c_flags */
87 #define RDS_LL_SEND_FULL 0
88 #define RDS_RECONNECT_PENDING 1
90 #define RDS_RECV_REFILL 3
91 #define RDS_DESTROY_PENDING 4
93 /* Max number of multipaths per RDS connection. Must be a power of 2 */
94 #define RDS_MPATH_WORKERS 8
95 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
96 (rs)->rs_hash_initval) & ((n) - 1))
98 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr))
100 /* Per mpath connection state */
101 struct rds_conn_path {
102 struct rds_connection *cp_conn;
103 struct rds_message *cp_xmit_rm;
104 unsigned long cp_xmit_sg;
105 unsigned int cp_xmit_hdr_off;
106 unsigned int cp_xmit_data_off;
107 unsigned int cp_xmit_atomic_sent;
108 unsigned int cp_xmit_rdma_sent;
109 unsigned int cp_xmit_data_sent;
111 spinlock_t cp_lock; /* protect msg queues */
113 struct list_head cp_send_queue;
114 struct list_head cp_retrans;
118 void *cp_transport_data;
121 unsigned long cp_send_gen;
122 unsigned long cp_flags;
123 unsigned long cp_reconnect_jiffies;
124 struct delayed_work cp_send_w;
125 struct delayed_work cp_recv_w;
126 struct delayed_work cp_conn_w;
127 struct work_struct cp_down_w;
128 struct mutex cp_cm_lock; /* protect cp_state & cm */
129 wait_queue_head_t cp_waitq;
131 unsigned int cp_unacked_packets;
132 unsigned int cp_unacked_bytes;
133 unsigned int cp_index;
136 /* One rds_connection per RDS address pair */
137 struct rds_connection {
138 struct hlist_node c_hash_node;
141 unsigned int c_loopback:1,
145 struct rds_connection *c_passive;
146 struct rds_transport *c_trans;
148 struct rds_cong_map *c_lcong;
149 struct rds_cong_map *c_fcong;
151 /* Protocol version */
152 unsigned int c_version;
153 possible_net_t c_net;
155 struct list_head c_map_item;
156 unsigned long c_map_queued;
158 struct rds_conn_path *c_path;
159 wait_queue_head_t c_hs_waitq; /* handshake waitq */
166 struct net *rds_conn_net(struct rds_connection *conn)
168 return read_pnet(&conn->c_net);
172 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
174 write_pnet(&conn->c_net, net);
177 #define RDS_FLAG_CONG_BITMAP 0x01
178 #define RDS_FLAG_ACK_REQUIRED 0x02
179 #define RDS_FLAG_RETRANSMITTED 0x04
180 #define RDS_MAX_ADV_CREDIT 255
182 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
183 * probe to exchange control information before establishing a connection.
184 * Currently the control information that is exchanged is the number of
185 * supported paths. If the peer is a legacy (older kernel revision) peer,
186 * it would return a pong message without additional control information
187 * that would then alert the sender that the peer was an older rev.
189 #define RDS_FLAG_PROBE_PORT 1
190 #define RDS_HS_PROBE(sport, dport) \
191 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
192 (sport == 0 && dport == RDS_FLAG_PROBE_PORT))
194 * Maximum space available for extension headers.
196 #define RDS_HEADER_EXT_SPACE 16
209 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
213 * Reserved - indicates end of extensions
215 #define RDS_EXTHDR_NONE 0
218 * This extension header is included in the very
219 * first message that is sent on a new connection,
220 * and identifies the protocol level. This will help
221 * rolling updates if a future change requires breaking
223 * NB: This is no longer true for IB, where we do a version
224 * negotiation during the connection setup phase (protocol
225 * version information is included in the RDMA CM private data).
227 #define RDS_EXTHDR_VERSION 1
228 struct rds_ext_header_version {
233 * This extension header is included in the RDS message
234 * chasing an RDMA operation.
236 #define RDS_EXTHDR_RDMA 2
237 struct rds_ext_header_rdma {
242 * This extension header tells the peer about the
243 * destination <R_Key,offset> of the requested RDMA
246 #define RDS_EXTHDR_RDMA_DEST 3
247 struct rds_ext_header_rdma_dest {
249 __be32 h_rdma_offset;
252 /* Extension header announcing number of paths.
253 * Implicit length = 2 bytes.
255 #define RDS_EXTHDR_NPATHS 5
256 #define RDS_EXTHDR_GEN_NUM 6
258 #define __RDS_EXTHDR_MAX 16 /* for now */
259 #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1)
260 #define RDS_MSG_RX_HDR 0
261 #define RDS_MSG_RX_START 1
262 #define RDS_MSG_RX_END 2
263 #define RDS_MSG_RX_CMSG 3
265 struct rds_incoming {
266 refcount_t i_refcount;
267 struct list_head i_item;
268 struct rds_connection *i_conn;
269 struct rds_conn_path *i_conn_path;
270 struct rds_header i_hdr;
271 unsigned long i_rx_jiffies;
274 rds_rdma_cookie_t i_rdma_cookie;
275 struct timeval i_rx_tstamp;
276 u64 i_rx_lat_trace[RDS_RX_MAX_TRACES];
280 struct rb_node r_rb_node;
281 refcount_t r_refcount;
284 /* A copy of the creation flags */
285 unsigned int r_use_once:1;
286 unsigned int r_invalidate:1;
287 unsigned int r_write:1;
289 /* This is for RDS_MR_DEAD.
290 * It would be nice & consistent to make this part of the above
291 * bit field here, but we need to use test_and_set_bit.
293 unsigned long r_state;
294 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
295 struct rds_transport *r_trans;
296 void *r_trans_private;
299 /* Flags for mr->r_state */
300 #define RDS_MR_DEAD 0
302 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
304 return r_key | (((u64) offset) << 32);
307 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
312 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
317 /* atomic operation types */
318 #define RDS_ATOMIC_TYPE_CSWP 0
319 #define RDS_ATOMIC_TYPE_FADD 1
322 * m_sock_item and m_conn_item are on lists that are serialized under
323 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
324 * the message will not be put back on the retransmit list after being sent.
325 * messages that are canceled while being sent rely on this.
327 * m_inc is used by loopback so that it can pass an incoming message straight
328 * back up into the rx path. It embeds a wire header which is also used by
329 * the send path, which is kind of awkward.
331 * m_sock_item indicates the message's presence on a socket's send or receive
332 * queue. m_rs will point to that socket.
334 * m_daddr is used by cancellation to prune messages to a given destination.
336 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
337 * nesting. As paths iterate over messages on a sock, or conn, they must
338 * also lock the conn, or sock, to remove the message from those lists too.
339 * Testing the flag to determine if the message is still on the lists lets
340 * us avoid testing the list_head directly. That means each path can use
341 * the message's list_head to keep it on a local list while juggling locks
342 * without confusing the other path.
344 * m_ack_seq is an optional field set by transports who need a different
345 * sequence number range to invalidate. They can use this in a callback
346 * that they pass to rds_send_drop_acked() to see if each message has been
347 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
348 * had ack_seq set yet.
350 #define RDS_MSG_ON_SOCK 1
351 #define RDS_MSG_ON_CONN 2
352 #define RDS_MSG_HAS_ACK_SEQ 3
353 #define RDS_MSG_ACK_REQUIRED 4
354 #define RDS_MSG_RETRANSMITTED 5
355 #define RDS_MSG_MAPPED 6
356 #define RDS_MSG_PAGEVEC 7
357 #define RDS_MSG_FLUSH 8
359 struct rds_znotifier {
360 struct list_head z_list;
365 #define RDS_ZCOPY_SKB(__skb) ((struct rds_znotifier *)&((__skb)->cb[0]))
367 static inline struct sk_buff *rds_skb_from_znotifier(struct rds_znotifier *z)
369 return container_of((void *)z, struct sk_buff, cb);
373 refcount_t m_refcount;
374 struct list_head m_sock_item;
375 struct list_head m_conn_item;
376 struct rds_incoming m_inc;
379 unsigned long m_flags;
381 /* Never access m_rs without holding m_rs_lock.
386 spinlock_t m_rs_lock;
387 wait_queue_head_t m_flush_wait;
389 struct rds_sock *m_rs;
391 /* cookie to send to remote, in rds header */
392 rds_rdma_cookie_t m_rdma_cookie;
394 unsigned int m_used_sgs;
395 unsigned int m_total_sgs;
400 struct rm_atomic_op {
406 uint64_t compare_mask;
411 uint64_t nocarry_mask;
417 unsigned int op_notify:1;
418 unsigned int op_recverr:1;
419 unsigned int op_mapped:1;
420 unsigned int op_silent:1;
421 unsigned int op_active:1;
422 struct scatterlist *op_sg;
423 struct rds_notifier *op_notifier;
425 struct rds_mr *op_rdma_mr;
430 unsigned int op_write:1;
431 unsigned int op_fence:1;
432 unsigned int op_notify:1;
433 unsigned int op_recverr:1;
434 unsigned int op_mapped:1;
435 unsigned int op_silent:1;
436 unsigned int op_active:1;
437 unsigned int op_bytes;
438 unsigned int op_nents;
439 unsigned int op_count;
440 struct scatterlist *op_sg;
441 struct rds_notifier *op_notifier;
443 struct rds_mr *op_rdma_mr;
446 unsigned int op_active:1;
447 unsigned int op_notify:1;
448 unsigned int op_nents;
449 unsigned int op_count;
450 unsigned int op_dmasg;
451 unsigned int op_dmaoff;
452 struct rds_znotifier *op_mmp_znotifier;
453 struct scatterlist *op_sg;
459 * The RDS notifier is used (optionally) to tell the application about
460 * completed RDMA operations. Rather than keeping the whole rds message
461 * around on the queue, we allocate a small notifier that is put on the
462 * socket's notifier_list. Notifications are delivered to the application
463 * through control messages.
465 struct rds_notifier {
466 struct list_head n_list;
467 uint64_t n_user_token;
472 * struct rds_transport - transport specific behavioural hooks
474 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
475 * part of a message. The caller serializes on the send_sem so this
476 * doesn't need to be reentrant for a given conn. The header must be
477 * sent before the data payload. .xmit must be prepared to send a
478 * message with no data payload. .xmit should return the number of
479 * bytes that were sent down the connection, including header bytes.
480 * Returning 0 tells the caller that it doesn't need to perform any
481 * additional work now. This is usually the case when the transport has
482 * filled the sending queue for its connection and will handle
483 * triggering the rds thread to continue the send when space becomes
484 * available. Returning -EAGAIN tells the caller to retry the send
485 * immediately. Returning -ENOMEM tells the caller to retry the send at
486 * some point in the future.
488 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
489 * it returns the connection can not call rds_recv_incoming().
490 * This will only be called once after conn_connect returns
491 * non-zero success and will The caller serializes this with
492 * the send and connecting paths (xmit_* and conn_*). The
493 * transport is responsible for other serialization, including
494 * rds_recv_incoming(). This is called in process context but
495 * should try hard not to block.
498 struct rds_transport {
499 char t_name[TRANSNAMSIZ];
500 struct list_head t_item;
501 struct module *t_owner;
502 unsigned int t_prefer_loopback:1,
506 int (*laddr_check)(struct net *net, __be32 addr);
507 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
508 void (*conn_free)(void *data);
509 int (*conn_path_connect)(struct rds_conn_path *cp);
510 void (*conn_path_shutdown)(struct rds_conn_path *conn);
511 void (*xmit_path_prepare)(struct rds_conn_path *cp);
512 void (*xmit_path_complete)(struct rds_conn_path *cp);
513 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
514 unsigned int hdr_off, unsigned int sg, unsigned int off);
515 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
516 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
517 int (*recv_path)(struct rds_conn_path *cp);
518 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
519 void (*inc_free)(struct rds_incoming *inc);
521 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
522 struct rdma_cm_event *event);
523 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
524 void (*cm_connect_complete)(struct rds_connection *conn,
525 struct rdma_cm_event *event);
527 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
530 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
531 struct rds_sock *rs, u32 *key_ret);
532 void (*sync_mr)(void *trans_private, int direction);
533 void (*free_mr)(void *trans_private, int invalidate);
534 void (*flush_mrs)(void);
535 bool (*t_unloading)(struct rds_connection *conn);
545 * bound_addr used for both incoming and outgoing, no INADDR_ANY
548 struct rhash_head rs_bound_node;
550 __be32 rs_bound_addr;
552 __be16 rs_bound_port;
554 struct rds_transport *rs_transport;
557 * rds_sendmsg caches the conn it used the last time around.
558 * This helps avoid costly lookups.
560 struct rds_connection *rs_conn;
562 /* flag indicating we were congested or not */
564 /* seen congestion (ENOBUFS) when sending? */
565 int rs_seen_congestion;
567 /* rs_lock protects all these adjacent members before the newline */
569 struct list_head rs_send_queue;
572 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
574 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
575 * to decide whether the application should be woken up.
576 * If not set, we use rs_cong_track to find out whether a cong map
579 uint64_t rs_cong_mask;
580 uint64_t rs_cong_notify;
581 struct list_head rs_cong_list;
582 unsigned long rs_cong_track;
585 * rs_recv_lock protects the receive queue, and is
586 * used to serialize with rds_release.
588 rwlock_t rs_recv_lock;
589 struct list_head rs_recv_queue;
591 /* just for stats reporting */
592 struct list_head rs_item;
594 /* these have their own lock */
595 spinlock_t rs_rdma_lock;
596 struct rb_root rs_rdma_keys;
598 /* Socket options - in case there will be more */
599 unsigned char rs_recverr,
603 /* Socket receive path trace points*/
605 u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
608 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
610 return container_of(sk, struct rds_sock, rs_sk);
612 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
618 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
619 * to account for overhead. We don't account for overhead, we just apply
620 * the number of payload bytes to the specified value.
622 static inline int rds_sk_sndbuf(struct rds_sock *rs)
624 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
626 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
628 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
631 struct rds_statistics {
632 uint64_t s_conn_reset;
633 uint64_t s_recv_drop_bad_checksum;
634 uint64_t s_recv_drop_old_seq;
635 uint64_t s_recv_drop_no_sock;
636 uint64_t s_recv_drop_dead_sock;
637 uint64_t s_recv_deliver_raced;
638 uint64_t s_recv_delivered;
639 uint64_t s_recv_queued;
640 uint64_t s_recv_immediate_retry;
641 uint64_t s_recv_delayed_retry;
642 uint64_t s_recv_ack_required;
643 uint64_t s_recv_rdma_bytes;
644 uint64_t s_recv_ping;
645 uint64_t s_send_queue_empty;
646 uint64_t s_send_queue_full;
647 uint64_t s_send_lock_contention;
648 uint64_t s_send_lock_queue_raced;
649 uint64_t s_send_immediate_retry;
650 uint64_t s_send_delayed_retry;
651 uint64_t s_send_drop_acked;
652 uint64_t s_send_ack_required;
653 uint64_t s_send_queued;
654 uint64_t s_send_rdma;
655 uint64_t s_send_rdma_bytes;
656 uint64_t s_send_pong;
657 uint64_t s_page_remainder_hit;
658 uint64_t s_page_remainder_miss;
659 uint64_t s_copy_to_user;
660 uint64_t s_copy_from_user;
661 uint64_t s_cong_update_queued;
662 uint64_t s_cong_update_received;
663 uint64_t s_cong_send_error;
664 uint64_t s_cong_send_blocked;
665 uint64_t s_recv_bytes_added_to_socket;
666 uint64_t s_recv_bytes_removed_from_socket;
671 void rds_sock_addref(struct rds_sock *rs);
672 void rds_sock_put(struct rds_sock *rs);
673 void rds_wake_sk_sleep(struct rds_sock *rs);
674 static inline void __rds_wake_sk_sleep(struct sock *sk)
676 wait_queue_head_t *waitq = sk_sleep(sk);
678 if (!sock_flag(sk, SOCK_DEAD) && waitq)
681 extern wait_queue_head_t rds_poll_waitq;
685 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
686 void rds_remove_bound(struct rds_sock *rs);
687 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
688 int rds_bind_lock_init(void);
689 void rds_bind_lock_destroy(void);
692 int rds_cong_get_maps(struct rds_connection *conn);
693 void rds_cong_add_conn(struct rds_connection *conn);
694 void rds_cong_remove_conn(struct rds_connection *conn);
695 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
696 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
697 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
698 void rds_cong_queue_updates(struct rds_cong_map *map);
699 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
700 int rds_cong_updated_since(unsigned long *recent);
701 void rds_cong_add_socket(struct rds_sock *);
702 void rds_cong_remove_socket(struct rds_sock *);
703 void rds_cong_exit(void);
704 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
707 extern u32 rds_gen_num;
708 int rds_conn_init(void);
709 void rds_conn_exit(void);
710 struct rds_connection *rds_conn_create(struct net *net,
711 __be32 laddr, __be32 faddr,
712 struct rds_transport *trans, gfp_t gfp);
713 struct rds_connection *rds_conn_create_outgoing(struct net *net,
714 __be32 laddr, __be32 faddr,
715 struct rds_transport *trans, gfp_t gfp);
716 void rds_conn_shutdown(struct rds_conn_path *cpath);
717 void rds_conn_destroy(struct rds_connection *conn);
718 void rds_conn_drop(struct rds_connection *conn);
719 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy);
720 void rds_conn_connect_if_down(struct rds_connection *conn);
721 void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
722 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
723 struct rds_info_iterator *iter,
724 struct rds_info_lengths *lens,
725 int (*visitor)(struct rds_connection *, void *),
729 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...);
730 #define rds_conn_path_error(cp, fmt...) \
731 __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
734 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
736 return atomic_cmpxchg(&cp->cp_state, old, new) == old;
740 rds_conn_transition(struct rds_connection *conn, int old, int new)
742 WARN_ON(conn->c_trans->t_mp_capable);
743 return rds_conn_path_transition(&conn->c_path[0], old, new);
747 rds_conn_path_state(struct rds_conn_path *cp)
749 return atomic_read(&cp->cp_state);
753 rds_conn_state(struct rds_connection *conn)
755 WARN_ON(conn->c_trans->t_mp_capable);
756 return rds_conn_path_state(&conn->c_path[0]);
760 rds_conn_path_up(struct rds_conn_path *cp)
762 return atomic_read(&cp->cp_state) == RDS_CONN_UP;
766 rds_conn_up(struct rds_connection *conn)
768 WARN_ON(conn->c_trans->t_mp_capable);
769 return rds_conn_path_up(&conn->c_path[0]);
773 rds_conn_path_connecting(struct rds_conn_path *cp)
775 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
779 rds_conn_connecting(struct rds_connection *conn)
781 WARN_ON(conn->c_trans->t_mp_capable);
782 return rds_conn_path_connecting(&conn->c_path[0]);
786 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
787 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
788 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
789 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
790 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
791 __be16 dport, u64 seq);
792 int rds_message_add_extension(struct rds_header *hdr,
793 unsigned int type, const void *data, unsigned int len);
794 int rds_message_next_extension(struct rds_header *hdr,
795 unsigned int *pos, void *buf, unsigned int *buflen);
796 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
797 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
798 void rds_message_inc_free(struct rds_incoming *inc);
799 void rds_message_addref(struct rds_message *rm);
800 void rds_message_put(struct rds_message *rm);
801 void rds_message_wait(struct rds_message *rm);
802 void rds_message_unmapped(struct rds_message *rm);
804 static inline void rds_message_make_checksum(struct rds_header *hdr)
807 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
810 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
812 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
817 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
819 void rds_page_exit(void);
822 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
824 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
826 void rds_inc_put(struct rds_incoming *inc);
827 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
828 struct rds_incoming *inc, gfp_t gfp);
829 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
831 void rds_clear_recv_queue(struct rds_sock *rs);
832 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
833 void rds_inc_info_copy(struct rds_incoming *inc,
834 struct rds_info_iterator *iter,
835 __be32 saddr, __be32 daddr, int flip);
838 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
839 void rds_send_path_reset(struct rds_conn_path *conn);
840 int rds_send_xmit(struct rds_conn_path *cp);
842 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
843 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
844 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
845 is_acked_func is_acked);
846 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
847 is_acked_func is_acked);
848 void rds_send_ping(struct rds_connection *conn, int cp_index);
849 int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
852 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
853 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
854 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
855 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
856 void rds_rdma_drop_keys(struct rds_sock *rs);
857 int rds_rdma_extra_size(struct rds_rdma_args *args);
858 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
859 struct cmsghdr *cmsg);
860 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
861 struct cmsghdr *cmsg);
862 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
863 struct cmsghdr *cmsg);
864 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
865 struct cmsghdr *cmsg);
866 void rds_rdma_free_op(struct rm_rdma_op *ro);
867 void rds_atomic_free_op(struct rm_atomic_op *ao);
868 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
869 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
870 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
871 struct cmsghdr *cmsg);
873 void __rds_put_mr_final(struct rds_mr *mr);
874 static inline void rds_mr_put(struct rds_mr *mr)
876 if (refcount_dec_and_test(&mr->r_refcount))
877 __rds_put_mr_final(mr);
880 static inline bool rds_destroy_pending(struct rds_connection *conn)
882 return !check_net(rds_conn_net(conn)) ||
883 (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn));
887 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
888 #define rds_stats_inc_which(which, member) do { \
889 per_cpu(which, get_cpu()).member++; \
892 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
893 #define rds_stats_add_which(which, member, count) do { \
894 per_cpu(which, get_cpu()).member += count; \
897 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
898 int rds_stats_init(void);
899 void rds_stats_exit(void);
900 void rds_stats_info_copy(struct rds_info_iterator *iter,
901 uint64_t *values, const char *const *names,
905 int rds_sysctl_init(void);
906 void rds_sysctl_exit(void);
907 extern unsigned long rds_sysctl_sndbuf_min;
908 extern unsigned long rds_sysctl_sndbuf_default;
909 extern unsigned long rds_sysctl_sndbuf_max;
910 extern unsigned long rds_sysctl_reconnect_min_jiffies;
911 extern unsigned long rds_sysctl_reconnect_max_jiffies;
912 extern unsigned int rds_sysctl_max_unacked_packets;
913 extern unsigned int rds_sysctl_max_unacked_bytes;
914 extern unsigned int rds_sysctl_ping_enable;
915 extern unsigned long rds_sysctl_trace_flags;
916 extern unsigned int rds_sysctl_trace_level;
919 int rds_threads_init(void);
920 void rds_threads_exit(void);
921 extern struct workqueue_struct *rds_wq;
922 void rds_queue_reconnect(struct rds_conn_path *cp);
923 void rds_connect_worker(struct work_struct *);
924 void rds_shutdown_worker(struct work_struct *);
925 void rds_send_worker(struct work_struct *);
926 void rds_recv_worker(struct work_struct *);
927 void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
928 void rds_connect_complete(struct rds_connection *conn);
931 void rds_trans_register(struct rds_transport *trans);
932 void rds_trans_unregister(struct rds_transport *trans);
933 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
934 void rds_trans_put(struct rds_transport *trans);
935 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
937 struct rds_transport *rds_trans_get(int t_type);
938 int rds_trans_init(void);
939 void rds_trans_exit(void);