xref: /openbmc/linux/net/rds/rds.h (revision b627b4ed)
1 #ifndef _RDS_RDS_H
2 #define _RDS_RDS_H
3 
4 #include <net/sock.h>
5 #include <linux/scatterlist.h>
6 #include <linux/highmem.h>
7 #include <rdma/rdma_cm.h>
8 #include <linux/mutex.h>
9 #include <linux/rds.h>
10 
11 #include "info.h"
12 
13 /*
14  * RDS Network protocol version
15  */
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)
22 
23 /*
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.
28  */
29 #define RDS_PORT	18634
30 
31 #ifdef ATOMIC64_INIT
32 #define KERNEL_HAS_ATOMIC64
33 #endif
34 
35 #ifdef DEBUG
36 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
37 #else
38 /* sigh, pr_debug() causes unused variable warnings */
39 static inline void __attribute__ ((format (printf, 1, 2)))
40 rdsdebug(char *fmt, ...)
41 {
42 }
43 #endif
44 
45 /* XXX is there one of these somewhere? */
46 #define ceil(x, y) \
47 	({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
48 
49 #define RDS_FRAG_SHIFT	12
50 #define RDS_FRAG_SIZE	((unsigned int)(1 << RDS_FRAG_SHIFT))
51 
52 #define RDS_CONG_MAP_BYTES	(65536 / 8)
53 #define RDS_CONG_MAP_LONGS	(RDS_CONG_MAP_BYTES / sizeof(unsigned long))
54 #define RDS_CONG_MAP_PAGES	(PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
55 #define RDS_CONG_MAP_PAGE_BITS	(PAGE_SIZE * 8)
56 
57 struct rds_cong_map {
58 	struct rb_node		m_rb_node;
59 	__be32			m_addr;
60 	wait_queue_head_t	m_waitq;
61 	struct list_head	m_conn_list;
62 	unsigned long		m_page_addrs[RDS_CONG_MAP_PAGES];
63 };
64 
65 
66 /*
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
70  * a memory barrier.
71  */
72 enum {
73 	RDS_CONN_DOWN = 0,
74 	RDS_CONN_CONNECTING,
75 	RDS_CONN_DISCONNECTING,
76 	RDS_CONN_UP,
77 	RDS_CONN_ERROR,
78 };
79 
80 /* Bits for c_flags */
81 #define RDS_LL_SEND_FULL	0
82 #define RDS_RECONNECT_PENDING	1
83 
84 struct rds_connection {
85 	struct hlist_node	c_hash_node;
86 	__be32			c_laddr;
87 	__be32			c_faddr;
88 	unsigned int		c_loopback:1;
89 	struct rds_connection	*c_passive;
90 
91 	struct rds_cong_map	*c_lcong;
92 	struct rds_cong_map	*c_fcong;
93 
94 	struct mutex		c_send_lock;	/* protect send ring */
95 	struct rds_message	*c_xmit_rm;
96 	unsigned long		c_xmit_sg;
97 	unsigned int		c_xmit_hdr_off;
98 	unsigned int		c_xmit_data_off;
99 	unsigned int		c_xmit_rdma_sent;
100 
101 	spinlock_t		c_lock;		/* protect msg queues */
102 	u64			c_next_tx_seq;
103 	struct list_head	c_send_queue;
104 	struct list_head	c_retrans;
105 
106 	u64			c_next_rx_seq;
107 
108 	struct rds_transport	*c_trans;
109 	void			*c_transport_data;
110 
111 	atomic_t		c_state;
112 	unsigned long		c_flags;
113 	unsigned long		c_reconnect_jiffies;
114 	struct delayed_work	c_send_w;
115 	struct delayed_work	c_recv_w;
116 	struct delayed_work	c_conn_w;
117 	struct work_struct	c_down_w;
118 	struct mutex		c_cm_lock;	/* protect conn state & cm */
119 
120 	struct list_head	c_map_item;
121 	unsigned long		c_map_queued;
122 	unsigned long		c_map_offset;
123 	unsigned long		c_map_bytes;
124 
125 	unsigned int		c_unacked_packets;
126 	unsigned int		c_unacked_bytes;
127 
128 	/* Protocol version */
129 	unsigned int		c_version;
130 };
131 
132 #define RDS_FLAG_CONG_BITMAP	0x01
133 #define RDS_FLAG_ACK_REQUIRED	0x02
134 #define RDS_FLAG_RETRANSMITTED	0x04
135 #define RDS_MAX_ADV_CREDIT	127
136 
137 /*
138  * Maximum space available for extension headers.
139  */
140 #define RDS_HEADER_EXT_SPACE	16
141 
142 struct rds_header {
143 	__be64	h_sequence;
144 	__be64	h_ack;
145 	__be32	h_len;
146 	__be16	h_sport;
147 	__be16	h_dport;
148 	u8	h_flags;
149 	u8	h_credit;
150 	u8	h_padding[4];
151 	__sum16	h_csum;
152 
153 	u8	h_exthdr[RDS_HEADER_EXT_SPACE];
154 };
155 
156 /*
157  * Reserved - indicates end of extensions
158  */
159 #define RDS_EXTHDR_NONE		0
160 
161 /*
162  * This extension header is included in the very
163  * first message that is sent on a new connection,
164  * and identifies the protocol level. This will help
165  * rolling updates if a future change requires breaking
166  * the protocol.
167  * NB: This is no longer true for IB, where we do a version
168  * negotiation during the connection setup phase (protocol
169  * version information is included in the RDMA CM private data).
170  */
171 #define RDS_EXTHDR_VERSION	1
172 struct rds_ext_header_version {
173 	__be32			h_version;
174 };
175 
176 /*
177  * This extension header is included in the RDS message
178  * chasing an RDMA operation.
179  */
180 #define RDS_EXTHDR_RDMA		2
181 struct rds_ext_header_rdma {
182 	__be32			h_rdma_rkey;
183 };
184 
185 /*
186  * This extension header tells the peer about the
187  * destination <R_Key,offset> of the requested RDMA
188  * operation.
189  */
190 #define RDS_EXTHDR_RDMA_DEST	3
191 struct rds_ext_header_rdma_dest {
192 	__be32			h_rdma_rkey;
193 	__be32			h_rdma_offset;
194 };
195 
196 #define __RDS_EXTHDR_MAX	16 /* for now */
197 
198 struct rds_incoming {
199 	atomic_t		i_refcount;
200 	struct list_head	i_item;
201 	struct rds_connection	*i_conn;
202 	struct rds_header	i_hdr;
203 	unsigned long		i_rx_jiffies;
204 	__be32			i_saddr;
205 
206 	rds_rdma_cookie_t	i_rdma_cookie;
207 };
208 
209 /*
210  * m_sock_item and m_conn_item are on lists that are serialized under
211  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
212  * the message will not be put back on the retransmit list after being sent.
213  * messages that are canceled while being sent rely on this.
214  *
215  * m_inc is used by loopback so that it can pass an incoming message straight
216  * back up into the rx path.  It embeds a wire header which is also used by
217  * the send path, which is kind of awkward.
218  *
219  * m_sock_item indicates the message's presence on a socket's send or receive
220  * queue.  m_rs will point to that socket.
221  *
222  * m_daddr is used by cancellation to prune messages to a given destination.
223  *
224  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
225  * nesting.  As paths iterate over messages on a sock, or conn, they must
226  * also lock the conn, or sock, to remove the message from those lists too.
227  * Testing the flag to determine if the message is still on the lists lets
228  * us avoid testing the list_head directly.  That means each path can use
229  * the message's list_head to keep it on a local list while juggling locks
230  * without confusing the other path.
231  *
232  * m_ack_seq is an optional field set by transports who need a different
233  * sequence number range to invalidate.  They can use this in a callback
234  * that they pass to rds_send_drop_acked() to see if each message has been
235  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
236  * had ack_seq set yet.
237  */
238 #define RDS_MSG_ON_SOCK		1
239 #define RDS_MSG_ON_CONN		2
240 #define RDS_MSG_HAS_ACK_SEQ	3
241 #define RDS_MSG_ACK_REQUIRED	4
242 #define RDS_MSG_RETRANSMITTED	5
243 #define RDS_MSG_MAPPED		6
244 #define RDS_MSG_PAGEVEC		7
245 
246 struct rds_message {
247 	atomic_t		m_refcount;
248 	struct list_head	m_sock_item;
249 	struct list_head	m_conn_item;
250 	struct rds_incoming	m_inc;
251 	u64			m_ack_seq;
252 	__be32			m_daddr;
253 	unsigned long		m_flags;
254 
255 	/* Never access m_rs without holding m_rs_lock.
256 	 * Lock nesting is
257 	 *  rm->m_rs_lock
258 	 *   -> rs->rs_lock
259 	 */
260 	spinlock_t		m_rs_lock;
261 	struct rds_sock		*m_rs;
262 	struct rds_rdma_op	*m_rdma_op;
263 	rds_rdma_cookie_t	m_rdma_cookie;
264 	struct rds_mr		*m_rdma_mr;
265 	unsigned int		m_nents;
266 	unsigned int		m_count;
267 	struct scatterlist	m_sg[0];
268 };
269 
270 /*
271  * The RDS notifier is used (optionally) to tell the application about
272  * completed RDMA operations. Rather than keeping the whole rds message
273  * around on the queue, we allocate a small notifier that is put on the
274  * socket's notifier_list. Notifications are delivered to the application
275  * through control messages.
276  */
277 struct rds_notifier {
278 	struct list_head	n_list;
279 	uint64_t		n_user_token;
280 	int			n_status;
281 };
282 
283 /**
284  * struct rds_transport -  transport specific behavioural hooks
285  *
286  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
287  *        part of a message.  The caller serializes on the send_sem so this
288  *        doesn't need to be reentrant for a given conn.  The header must be
289  *        sent before the data payload.  .xmit must be prepared to send a
290  *        message with no data payload.  .xmit should return the number of
291  *        bytes that were sent down the connection, including header bytes.
292  *        Returning 0 tells the caller that it doesn't need to perform any
293  *        additional work now.  This is usually the case when the transport has
294  *        filled the sending queue for its connection and will handle
295  *        triggering the rds thread to continue the send when space becomes
296  *        available.  Returning -EAGAIN tells the caller to retry the send
297  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
298  *        some point in the future.
299  *
300  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
301  *                 it returns the connection can not call rds_recv_incoming().
302  *                 This will only be called once after conn_connect returns
303  *                 non-zero success and will The caller serializes this with
304  *                 the send and connecting paths (xmit_* and conn_*).  The
305  *                 transport is responsible for other serialization, including
306  *                 rds_recv_incoming().  This is called in process context but
307  *                 should try hard not to block.
308  *
309  * @xmit_cong_map: This asks the transport to send the local bitmap down the
310  * 		   given connection.  XXX get a better story about the bitmap
311  * 		   flag and header.
312  */
313 
314 struct rds_transport {
315 	char			t_name[TRANSNAMSIZ];
316 	struct list_head	t_item;
317 	struct module		*t_owner;
318 	unsigned int		t_prefer_loopback:1;
319 
320 	int (*laddr_check)(__be32 addr);
321 	int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
322 	void (*conn_free)(void *data);
323 	int (*conn_connect)(struct rds_connection *conn);
324 	void (*conn_shutdown)(struct rds_connection *conn);
325 	void (*xmit_prepare)(struct rds_connection *conn);
326 	void (*xmit_complete)(struct rds_connection *conn);
327 	int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
328 		    unsigned int hdr_off, unsigned int sg, unsigned int off);
329 	int (*xmit_cong_map)(struct rds_connection *conn,
330 			     struct rds_cong_map *map, unsigned long offset);
331 	int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
332 	int (*recv)(struct rds_connection *conn);
333 	int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
334 				size_t size);
335 	void (*inc_purge)(struct rds_incoming *inc);
336 	void (*inc_free)(struct rds_incoming *inc);
337 
338 	int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
339 				 struct rdma_cm_event *event);
340 	int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
341 	void (*cm_connect_complete)(struct rds_connection *conn,
342 				    struct rdma_cm_event *event);
343 
344 	unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
345 					unsigned int avail);
346 	void (*exit)(void);
347 	void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
348 			struct rds_sock *rs, u32 *key_ret);
349 	void (*sync_mr)(void *trans_private, int direction);
350 	void (*free_mr)(void *trans_private, int invalidate);
351 	void (*flush_mrs)(void);
352 };
353 
354 struct rds_sock {
355 	struct sock		rs_sk;
356 
357 	u64			rs_user_addr;
358 	u64			rs_user_bytes;
359 
360 	/*
361 	 * bound_addr used for both incoming and outgoing, no INADDR_ANY
362 	 * support.
363 	 */
364 	struct rb_node		rs_bound_node;
365 	__be32			rs_bound_addr;
366 	__be32			rs_conn_addr;
367 	__be16			rs_bound_port;
368 	__be16			rs_conn_port;
369 
370 	/*
371 	 * This is only used to communicate the transport between bind and
372 	 * initiating connections.  All other trans use is referenced through
373 	 * the connection.
374 	 */
375 	struct rds_transport    *rs_transport;
376 
377 	/*
378 	 * rds_sendmsg caches the conn it used the last time around.
379 	 * This helps avoid costly lookups.
380 	 */
381 	struct rds_connection	*rs_conn;
382 
383 	/* flag indicating we were congested or not */
384 	int			rs_congested;
385 
386 	/* rs_lock protects all these adjacent members before the newline */
387 	spinlock_t		rs_lock;
388 	struct list_head	rs_send_queue;
389 	u32			rs_snd_bytes;
390 	int			rs_rcv_bytes;
391 	struct list_head	rs_notify_queue;	/* currently used for failed RDMAs */
392 
393 	/* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
394 	 * to decide whether the application should be woken up.
395 	 * If not set, we use rs_cong_track to find out whether a cong map
396 	 * update arrived.
397 	 */
398 	uint64_t		rs_cong_mask;
399 	uint64_t		rs_cong_notify;
400 	struct list_head	rs_cong_list;
401 	unsigned long		rs_cong_track;
402 
403 	/*
404 	 * rs_recv_lock protects the receive queue, and is
405 	 * used to serialize with rds_release.
406 	 */
407 	rwlock_t		rs_recv_lock;
408 	struct list_head	rs_recv_queue;
409 
410 	/* just for stats reporting */
411 	struct list_head	rs_item;
412 
413 	/* these have their own lock */
414 	spinlock_t		rs_rdma_lock;
415 	struct rb_root		rs_rdma_keys;
416 
417 	/* Socket options - in case there will be more */
418 	unsigned char		rs_recverr,
419 				rs_cong_monitor;
420 };
421 
422 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
423 {
424 	return container_of(sk, struct rds_sock, rs_sk);
425 }
426 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
427 {
428 	return &rs->rs_sk;
429 }
430 
431 /*
432  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
433  * to account for overhead.  We don't account for overhead, we just apply
434  * the number of payload bytes to the specified value.
435  */
436 static inline int rds_sk_sndbuf(struct rds_sock *rs)
437 {
438 	return rds_rs_to_sk(rs)->sk_sndbuf / 2;
439 }
440 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
441 {
442 	return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
443 }
444 
445 struct rds_statistics {
446 	uint64_t	s_conn_reset;
447 	uint64_t	s_recv_drop_bad_checksum;
448 	uint64_t	s_recv_drop_old_seq;
449 	uint64_t	s_recv_drop_no_sock;
450 	uint64_t	s_recv_drop_dead_sock;
451 	uint64_t	s_recv_deliver_raced;
452 	uint64_t	s_recv_delivered;
453 	uint64_t	s_recv_queued;
454 	uint64_t	s_recv_immediate_retry;
455 	uint64_t	s_recv_delayed_retry;
456 	uint64_t	s_recv_ack_required;
457 	uint64_t	s_recv_rdma_bytes;
458 	uint64_t	s_recv_ping;
459 	uint64_t	s_send_queue_empty;
460 	uint64_t	s_send_queue_full;
461 	uint64_t	s_send_sem_contention;
462 	uint64_t	s_send_sem_queue_raced;
463 	uint64_t	s_send_immediate_retry;
464 	uint64_t	s_send_delayed_retry;
465 	uint64_t	s_send_drop_acked;
466 	uint64_t	s_send_ack_required;
467 	uint64_t	s_send_queued;
468 	uint64_t	s_send_rdma;
469 	uint64_t	s_send_rdma_bytes;
470 	uint64_t	s_send_pong;
471 	uint64_t	s_page_remainder_hit;
472 	uint64_t	s_page_remainder_miss;
473 	uint64_t	s_copy_to_user;
474 	uint64_t	s_copy_from_user;
475 	uint64_t	s_cong_update_queued;
476 	uint64_t	s_cong_update_received;
477 	uint64_t	s_cong_send_error;
478 	uint64_t	s_cong_send_blocked;
479 };
480 
481 /* af_rds.c */
482 void rds_sock_addref(struct rds_sock *rs);
483 void rds_sock_put(struct rds_sock *rs);
484 void rds_wake_sk_sleep(struct rds_sock *rs);
485 static inline void __rds_wake_sk_sleep(struct sock *sk)
486 {
487 	wait_queue_head_t *waitq = sk->sk_sleep;
488 
489 	if (!sock_flag(sk, SOCK_DEAD) && waitq)
490 		wake_up(waitq);
491 }
492 extern wait_queue_head_t rds_poll_waitq;
493 
494 
495 /* bind.c */
496 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
497 void rds_remove_bound(struct rds_sock *rs);
498 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
499 
500 /* cong.c */
501 int rds_cong_get_maps(struct rds_connection *conn);
502 void rds_cong_add_conn(struct rds_connection *conn);
503 void rds_cong_remove_conn(struct rds_connection *conn);
504 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
505 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
506 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
507 void rds_cong_queue_updates(struct rds_cong_map *map);
508 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
509 int rds_cong_updated_since(unsigned long *recent);
510 void rds_cong_add_socket(struct rds_sock *);
511 void rds_cong_remove_socket(struct rds_sock *);
512 void rds_cong_exit(void);
513 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
514 
515 /* conn.c */
516 int __init rds_conn_init(void);
517 void rds_conn_exit(void);
518 struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
519 				       struct rds_transport *trans, gfp_t gfp);
520 struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
521 			       struct rds_transport *trans, gfp_t gfp);
522 void rds_conn_destroy(struct rds_connection *conn);
523 void rds_conn_reset(struct rds_connection *conn);
524 void rds_conn_drop(struct rds_connection *conn);
525 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
526 			  struct rds_info_iterator *iter,
527 			  struct rds_info_lengths *lens,
528 			  int (*visitor)(struct rds_connection *, void *),
529 			  size_t item_len);
530 void __rds_conn_error(struct rds_connection *conn, const char *, ...)
531 				__attribute__ ((format (printf, 2, 3)));
532 #define rds_conn_error(conn, fmt...) \
533 	__rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
534 
535 static inline int
536 rds_conn_transition(struct rds_connection *conn, int old, int new)
537 {
538 	return atomic_cmpxchg(&conn->c_state, old, new) == old;
539 }
540 
541 static inline int
542 rds_conn_state(struct rds_connection *conn)
543 {
544 	return atomic_read(&conn->c_state);
545 }
546 
547 static inline int
548 rds_conn_up(struct rds_connection *conn)
549 {
550 	return atomic_read(&conn->c_state) == RDS_CONN_UP;
551 }
552 
553 static inline int
554 rds_conn_connecting(struct rds_connection *conn)
555 {
556 	return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
557 }
558 
559 /* message.c */
560 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
561 struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
562 					       size_t total_len);
563 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
564 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
565 				 __be16 dport, u64 seq);
566 int rds_message_add_extension(struct rds_header *hdr,
567 			      unsigned int type, const void *data, unsigned int len);
568 int rds_message_next_extension(struct rds_header *hdr,
569 			       unsigned int *pos, void *buf, unsigned int *buflen);
570 int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version);
571 int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version);
572 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
573 int rds_message_inc_copy_to_user(struct rds_incoming *inc,
574 				 struct iovec *first_iov, size_t size);
575 void rds_message_inc_purge(struct rds_incoming *inc);
576 void rds_message_inc_free(struct rds_incoming *inc);
577 void rds_message_addref(struct rds_message *rm);
578 void rds_message_put(struct rds_message *rm);
579 void rds_message_wait(struct rds_message *rm);
580 void rds_message_unmapped(struct rds_message *rm);
581 
582 static inline void rds_message_make_checksum(struct rds_header *hdr)
583 {
584 	hdr->h_csum = 0;
585 	hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
586 }
587 
588 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
589 {
590 	return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
591 }
592 
593 
594 /* page.c */
595 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
596 			     gfp_t gfp);
597 int rds_page_copy_user(struct page *page, unsigned long offset,
598 		       void __user *ptr, unsigned long bytes,
599 		       int to_user);
600 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
601 	rds_page_copy_user(page, offset, ptr, bytes, 1)
602 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
603 	rds_page_copy_user(page, offset, ptr, bytes, 0)
604 void rds_page_exit(void);
605 
606 /* recv.c */
607 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
608 		  __be32 saddr);
609 void rds_inc_addref(struct rds_incoming *inc);
610 void rds_inc_put(struct rds_incoming *inc);
611 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
612 		       struct rds_incoming *inc, gfp_t gfp, enum km_type km);
613 int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
614 		size_t size, int msg_flags);
615 void rds_clear_recv_queue(struct rds_sock *rs);
616 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
617 void rds_inc_info_copy(struct rds_incoming *inc,
618 		       struct rds_info_iterator *iter,
619 		       __be32 saddr, __be32 daddr, int flip);
620 
621 /* send.c */
622 int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
623 		size_t payload_len);
624 void rds_send_reset(struct rds_connection *conn);
625 int rds_send_xmit(struct rds_connection *conn);
626 struct sockaddr_in;
627 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
628 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
629 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
630 			 is_acked_func is_acked);
631 int rds_send_acked_before(struct rds_connection *conn, u64 seq);
632 void rds_send_remove_from_sock(struct list_head *messages, int status);
633 int rds_send_pong(struct rds_connection *conn, __be16 dport);
634 struct rds_message *rds_send_get_message(struct rds_connection *,
635 					 struct rds_rdma_op *);
636 
637 /* rdma.c */
638 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
639 
640 /* stats.c */
641 DECLARE_PER_CPU(struct rds_statistics, rds_stats);
642 #define rds_stats_inc_which(which, member) do {		\
643 	per_cpu(which, get_cpu()).member++;		\
644 	put_cpu();					\
645 } while (0)
646 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
647 #define rds_stats_add_which(which, member, count) do {		\
648 	per_cpu(which, get_cpu()).member += count;	\
649 	put_cpu();					\
650 } while (0)
651 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
652 int __init rds_stats_init(void);
653 void rds_stats_exit(void);
654 void rds_stats_info_copy(struct rds_info_iterator *iter,
655 			 uint64_t *values, char **names, size_t nr);
656 
657 /* sysctl.c */
658 int __init rds_sysctl_init(void);
659 void rds_sysctl_exit(void);
660 extern unsigned long rds_sysctl_sndbuf_min;
661 extern unsigned long rds_sysctl_sndbuf_default;
662 extern unsigned long rds_sysctl_sndbuf_max;
663 extern unsigned long rds_sysctl_reconnect_min_jiffies;
664 extern unsigned long rds_sysctl_reconnect_max_jiffies;
665 extern unsigned int  rds_sysctl_max_unacked_packets;
666 extern unsigned int  rds_sysctl_max_unacked_bytes;
667 extern unsigned int  rds_sysctl_ping_enable;
668 extern unsigned long rds_sysctl_trace_flags;
669 extern unsigned int  rds_sysctl_trace_level;
670 
671 /* threads.c */
672 int __init rds_threads_init(void);
673 void rds_threads_exit(void);
674 extern struct workqueue_struct *rds_wq;
675 void rds_connect_worker(struct work_struct *);
676 void rds_shutdown_worker(struct work_struct *);
677 void rds_send_worker(struct work_struct *);
678 void rds_recv_worker(struct work_struct *);
679 void rds_connect_complete(struct rds_connection *conn);
680 
681 /* transport.c */
682 int rds_trans_register(struct rds_transport *trans);
683 void rds_trans_unregister(struct rds_transport *trans);
684 struct rds_transport *rds_trans_get_preferred(__be32 addr);
685 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
686 				       unsigned int avail);
687 int __init rds_trans_init(void);
688 void rds_trans_exit(void);
689 
690 #endif
691