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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 */
39static inline void __attribute__ ((format (printf, 1, 2)))
40rdsdebug(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_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
54#define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
55
56struct rds_cong_map {
57 struct rb_node m_rb_node;
58 __be32 m_addr;
59 wait_queue_head_t m_waitq;
60 struct list_head m_conn_list;
61 unsigned long m_page_addrs[RDS_CONG_MAP_PAGES];
62};
63
64
65/*
66 * This is how we will track the connection state:
67 * A connection is always in one of the following
68 * states. Updates to the state are atomic and imply
69 * a memory barrier.
70 */
71enum {
72 RDS_CONN_DOWN = 0,
73 RDS_CONN_CONNECTING,
74 RDS_CONN_DISCONNECTING,
75 RDS_CONN_UP,
76 RDS_CONN_ERROR,
77};
78
79/* Bits for c_flags */
80#define RDS_LL_SEND_FULL 0
81#define RDS_RECONNECT_PENDING 1
82#define RDS_IN_XMIT 2
83
84struct 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 rds_message *c_xmit_rm;
95 unsigned long c_xmit_sg;
96 unsigned int c_xmit_hdr_off;
97 unsigned int c_xmit_data_off;
98 unsigned int c_xmit_atomic_sent;
99 unsigned int c_xmit_rdma_sent;
100 unsigned int c_xmit_data_sent;
101
102 spinlock_t c_lock; /* protect msg queues */
103 u64 c_next_tx_seq;
104 struct list_head c_send_queue;
105 struct list_head c_retrans;
106
107 u64 c_next_rx_seq;
108
109 struct rds_transport *c_trans;
110 void *c_transport_data;
111
112 atomic_t c_state;
113 unsigned long c_flags;
114 unsigned long c_reconnect_jiffies;
115 struct delayed_work c_send_w;
116 struct delayed_work c_recv_w;
117 struct delayed_work c_conn_w;
118 struct work_struct c_down_w;
119 struct mutex c_cm_lock; /* protect conn state & cm */
120 wait_queue_head_t c_waitq;
121
122 struct list_head c_map_item;
123 unsigned long c_map_queued;
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 255
136
137/*
138 * Maximum space available for extension headers.
139 */
140#define RDS_HEADER_EXT_SPACE 16
141
142struct 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
172struct 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
181struct 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
191struct 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
198struct 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
209struct rds_mr {
210 struct rb_node r_rb_node;
211 atomic_t r_refcount;
212 u32 r_key;
213
214 /* A copy of the creation flags */
215 unsigned int r_use_once:1;
216 unsigned int r_invalidate:1;
217 unsigned int r_write:1;
218
219 /* This is for RDS_MR_DEAD.
220 * It would be nice & consistent to make this part of the above
221 * bit field here, but we need to use test_and_set_bit.
222 */
223 unsigned long r_state;
224 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
225 struct rds_transport *r_trans;
226 void *r_trans_private;
227};
228
229/* Flags for mr->r_state */
230#define RDS_MR_DEAD 0
231
232static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
233{
234 return r_key | (((u64) offset) << 32);
235}
236
237static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
238{
239 return cookie;
240}
241
242static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
243{
244 return cookie >> 32;
245}
246
247/* atomic operation types */
248#define RDS_ATOMIC_TYPE_CSWP 0
249#define RDS_ATOMIC_TYPE_FADD 1
250
251/*
252 * m_sock_item and m_conn_item are on lists that are serialized under
253 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
254 * the message will not be put back on the retransmit list after being sent.
255 * messages that are canceled while being sent rely on this.
256 *
257 * m_inc is used by loopback so that it can pass an incoming message straight
258 * back up into the rx path. It embeds a wire header which is also used by
259 * the send path, which is kind of awkward.
260 *
261 * m_sock_item indicates the message's presence on a socket's send or receive
262 * queue. m_rs will point to that socket.
263 *
264 * m_daddr is used by cancellation to prune messages to a given destination.
265 *
266 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
267 * nesting. As paths iterate over messages on a sock, or conn, they must
268 * also lock the conn, or sock, to remove the message from those lists too.
269 * Testing the flag to determine if the message is still on the lists lets
270 * us avoid testing the list_head directly. That means each path can use
271 * the message's list_head to keep it on a local list while juggling locks
272 * without confusing the other path.
273 *
274 * m_ack_seq is an optional field set by transports who need a different
275 * sequence number range to invalidate. They can use this in a callback
276 * that they pass to rds_send_drop_acked() to see if each message has been
277 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
278 * had ack_seq set yet.
279 */
280#define RDS_MSG_ON_SOCK 1
281#define RDS_MSG_ON_CONN 2
282#define RDS_MSG_HAS_ACK_SEQ 3
283#define RDS_MSG_ACK_REQUIRED 4
284#define RDS_MSG_RETRANSMITTED 5
285#define RDS_MSG_MAPPED 6
286#define RDS_MSG_PAGEVEC 7
287
288struct rds_message {
289 atomic_t m_refcount;
290 struct list_head m_sock_item;
291 struct list_head m_conn_item;
292 struct rds_incoming m_inc;
293 u64 m_ack_seq;
294 __be32 m_daddr;
295 unsigned long m_flags;
296
297 /* Never access m_rs without holding m_rs_lock.
298 * Lock nesting is
299 * rm->m_rs_lock
300 * -> rs->rs_lock
301 */
302 spinlock_t m_rs_lock;
303 wait_queue_head_t m_flush_wait;
304
305 struct rds_sock *m_rs;
306
307 /* cookie to send to remote, in rds header */
308 rds_rdma_cookie_t m_rdma_cookie;
309
310 unsigned int m_used_sgs;
311 unsigned int m_total_sgs;
312
313 void *m_final_op;
314
315 struct {
316 struct rm_atomic_op {
317 int op_type;
318 union {
319 struct {
320 uint64_t compare;
321 uint64_t swap;
322 uint64_t compare_mask;
323 uint64_t swap_mask;
324 } op_m_cswp;
325 struct {
326 uint64_t add;
327 uint64_t nocarry_mask;
328 } op_m_fadd;
329 };
330
331 u32 op_rkey;
332 u64 op_remote_addr;
333 unsigned int op_notify:1;
334 unsigned int op_recverr:1;
335 unsigned int op_mapped:1;
336 unsigned int op_silent:1;
337 unsigned int op_active:1;
338 struct scatterlist *op_sg;
339 struct rds_notifier *op_notifier;
340
341 struct rds_mr *op_rdma_mr;
342 } atomic;
343 struct rm_rdma_op {
344 u32 op_rkey;
345 u64 op_remote_addr;
346 unsigned int op_write:1;
347 unsigned int op_fence:1;
348 unsigned int op_notify:1;
349 unsigned int op_recverr:1;
350 unsigned int op_mapped:1;
351 unsigned int op_silent:1;
352 unsigned int op_active:1;
353 unsigned int op_bytes;
354 unsigned int op_nents;
355 unsigned int op_count;
356 struct scatterlist *op_sg;
357 struct rds_notifier *op_notifier;
358
359 struct rds_mr *op_rdma_mr;
360 } rdma;
361 struct rm_data_op {
362 unsigned int op_active:1;
363 unsigned int op_nents;
364 unsigned int op_count;
365 struct scatterlist *op_sg;
366 } data;
367 };
368};
369
370/*
371 * The RDS notifier is used (optionally) to tell the application about
372 * completed RDMA operations. Rather than keeping the whole rds message
373 * around on the queue, we allocate a small notifier that is put on the
374 * socket's notifier_list. Notifications are delivered to the application
375 * through control messages.
376 */
377struct rds_notifier {
378 struct list_head n_list;
379 uint64_t n_user_token;
380 int n_status;
381};
382
383/**
384 * struct rds_transport - transport specific behavioural hooks
385 *
386 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
387 * part of a message. The caller serializes on the send_sem so this
388 * doesn't need to be reentrant for a given conn. The header must be
389 * sent before the data payload. .xmit must be prepared to send a
390 * message with no data payload. .xmit should return the number of
391 * bytes that were sent down the connection, including header bytes.
392 * Returning 0 tells the caller that it doesn't need to perform any
393 * additional work now. This is usually the case when the transport has
394 * filled the sending queue for its connection and will handle
395 * triggering the rds thread to continue the send when space becomes
396 * available. Returning -EAGAIN tells the caller to retry the send
397 * immediately. Returning -ENOMEM tells the caller to retry the send at
398 * some point in the future.
399 *
400 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
401 * it returns the connection can not call rds_recv_incoming().
402 * This will only be called once after conn_connect returns
403 * non-zero success and will The caller serializes this with
404 * the send and connecting paths (xmit_* and conn_*). The
405 * transport is responsible for other serialization, including
406 * rds_recv_incoming(). This is called in process context but
407 * should try hard not to block.
408 */
409
410#define RDS_TRANS_IB 0
411#define RDS_TRANS_IWARP 1
412#define RDS_TRANS_TCP 2
413#define RDS_TRANS_COUNT 3
414
415struct rds_transport {
416 char t_name[TRANSNAMSIZ];
417 struct list_head t_item;
418 struct module *t_owner;
419 unsigned int t_prefer_loopback:1;
420 unsigned int t_type;
421
422 int (*laddr_check)(__be32 addr);
423 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
424 void (*conn_free)(void *data);
425 int (*conn_connect)(struct rds_connection *conn);
426 void (*conn_shutdown)(struct rds_connection *conn);
427 void (*xmit_prepare)(struct rds_connection *conn);
428 void (*xmit_complete)(struct rds_connection *conn);
429 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
430 unsigned int hdr_off, unsigned int sg, unsigned int off);
431 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
432 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
433 int (*recv)(struct rds_connection *conn);
434 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
435 size_t size);
436 void (*inc_free)(struct rds_incoming *inc);
437
438 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
439 struct rdma_cm_event *event);
440 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
441 void (*cm_connect_complete)(struct rds_connection *conn,
442 struct rdma_cm_event *event);
443
444 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
445 unsigned int avail);
446 void (*exit)(void);
447 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
448 struct rds_sock *rs, u32 *key_ret);
449 void (*sync_mr)(void *trans_private, int direction);
450 void (*free_mr)(void *trans_private, int invalidate);
451 void (*flush_mrs)(void);
452};
453
454struct rds_sock {
455 struct sock rs_sk;
456
457 u64 rs_user_addr;
458 u64 rs_user_bytes;
459
460 /*
461 * bound_addr used for both incoming and outgoing, no INADDR_ANY
462 * support.
463 */
464 struct hlist_node rs_bound_node;
465 __be32 rs_bound_addr;
466 __be32 rs_conn_addr;
467 __be16 rs_bound_port;
468 __be16 rs_conn_port;
469 struct rds_transport *rs_transport;
470
471 /*
472 * rds_sendmsg caches the conn it used the last time around.
473 * This helps avoid costly lookups.
474 */
475 struct rds_connection *rs_conn;
476
477 /* flag indicating we were congested or not */
478 int rs_congested;
479 /* seen congestion (ENOBUFS) when sending? */
480 int rs_seen_congestion;
481
482 /* rs_lock protects all these adjacent members before the newline */
483 spinlock_t rs_lock;
484 struct list_head rs_send_queue;
485 u32 rs_snd_bytes;
486 int rs_rcv_bytes;
487 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
488
489 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
490 * to decide whether the application should be woken up.
491 * If not set, we use rs_cong_track to find out whether a cong map
492 * update arrived.
493 */
494 uint64_t rs_cong_mask;
495 uint64_t rs_cong_notify;
496 struct list_head rs_cong_list;
497 unsigned long rs_cong_track;
498
499 /*
500 * rs_recv_lock protects the receive queue, and is
501 * used to serialize with rds_release.
502 */
503 rwlock_t rs_recv_lock;
504 struct list_head rs_recv_queue;
505
506 /* just for stats reporting */
507 struct list_head rs_item;
508
509 /* these have their own lock */
510 spinlock_t rs_rdma_lock;
511 struct rb_root rs_rdma_keys;
512
513 /* Socket options - in case there will be more */
514 unsigned char rs_recverr,
515 rs_cong_monitor;
516};
517
518static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
519{
520 return container_of(sk, struct rds_sock, rs_sk);
521}
522static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
523{
524 return &rs->rs_sk;
525}
526
527/*
528 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
529 * to account for overhead. We don't account for overhead, we just apply
530 * the number of payload bytes to the specified value.
531 */
532static inline int rds_sk_sndbuf(struct rds_sock *rs)
533{
534 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
535}
536static inline int rds_sk_rcvbuf(struct rds_sock *rs)
537{
538 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
539}
540
541struct rds_statistics {
542 uint64_t s_conn_reset;
543 uint64_t s_recv_drop_bad_checksum;
544 uint64_t s_recv_drop_old_seq;
545 uint64_t s_recv_drop_no_sock;
546 uint64_t s_recv_drop_dead_sock;
547 uint64_t s_recv_deliver_raced;
548 uint64_t s_recv_delivered;
549 uint64_t s_recv_queued;
550 uint64_t s_recv_immediate_retry;
551 uint64_t s_recv_delayed_retry;
552 uint64_t s_recv_ack_required;
553 uint64_t s_recv_rdma_bytes;
554 uint64_t s_recv_ping;
555 uint64_t s_send_queue_empty;
556 uint64_t s_send_queue_full;
557 uint64_t s_send_lock_contention;
558 uint64_t s_send_lock_queue_raced;
559 uint64_t s_send_immediate_retry;
560 uint64_t s_send_delayed_retry;
561 uint64_t s_send_drop_acked;
562 uint64_t s_send_ack_required;
563 uint64_t s_send_queued;
564 uint64_t s_send_rdma;
565 uint64_t s_send_rdma_bytes;
566 uint64_t s_send_pong;
567 uint64_t s_page_remainder_hit;
568 uint64_t s_page_remainder_miss;
569 uint64_t s_copy_to_user;
570 uint64_t s_copy_from_user;
571 uint64_t s_cong_update_queued;
572 uint64_t s_cong_update_received;
573 uint64_t s_cong_send_error;
574 uint64_t s_cong_send_blocked;
575};
576
577/* af_rds.c */
578char *rds_str_array(char **array, size_t elements, size_t index);
579void rds_sock_addref(struct rds_sock *rs);
580void rds_sock_put(struct rds_sock *rs);
581void rds_wake_sk_sleep(struct rds_sock *rs);
582static inline void __rds_wake_sk_sleep(struct sock *sk)
583{
584 wait_queue_head_t *waitq = sk_sleep(sk);
585
586 if (!sock_flag(sk, SOCK_DEAD) && waitq)
587 wake_up(waitq);
588}
589extern wait_queue_head_t rds_poll_waitq;
590
591
592/* bind.c */
593int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
594void rds_remove_bound(struct rds_sock *rs);
595struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
596
597/* cong.c */
598int rds_cong_get_maps(struct rds_connection *conn);
599void rds_cong_add_conn(struct rds_connection *conn);
600void rds_cong_remove_conn(struct rds_connection *conn);
601void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
602void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
603int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
604void rds_cong_queue_updates(struct rds_cong_map *map);
605void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
606int rds_cong_updated_since(unsigned long *recent);
607void rds_cong_add_socket(struct rds_sock *);
608void rds_cong_remove_socket(struct rds_sock *);
609void rds_cong_exit(void);
610struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
611
612/* conn.c */
613int rds_conn_init(void);
614void rds_conn_exit(void);
615struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
616 struct rds_transport *trans, gfp_t gfp);
617struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
618 struct rds_transport *trans, gfp_t gfp);
619void rds_conn_shutdown(struct rds_connection *conn);
620void rds_conn_destroy(struct rds_connection *conn);
621void rds_conn_drop(struct rds_connection *conn);
622void rds_conn_connect_if_down(struct rds_connection *conn);
623void rds_for_each_conn_info(struct socket *sock, unsigned int len,
624 struct rds_info_iterator *iter,
625 struct rds_info_lengths *lens,
626 int (*visitor)(struct rds_connection *, void *),
627 size_t item_len);
628void __rds_conn_error(struct rds_connection *conn, const char *, ...)
629 __attribute__ ((format (printf, 2, 3)));
630#define rds_conn_error(conn, fmt...) \
631 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
632
633static inline int
634rds_conn_transition(struct rds_connection *conn, int old, int new)
635{
636 return atomic_cmpxchg(&conn->c_state, old, new) == old;
637}
638
639static inline int
640rds_conn_state(struct rds_connection *conn)
641{
642 return atomic_read(&conn->c_state);
643}
644
645static inline int
646rds_conn_up(struct rds_connection *conn)
647{
648 return atomic_read(&conn->c_state) == RDS_CONN_UP;
649}
650
651static inline int
652rds_conn_connecting(struct rds_connection *conn)
653{
654 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
655}
656
657/* message.c */
658struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
659struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
660int rds_message_copy_from_user(struct rds_message *rm, struct iovec *first_iov,
661 size_t total_len);
662struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
663void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
664 __be16 dport, u64 seq);
665int rds_message_add_extension(struct rds_header *hdr,
666 unsigned int type, const void *data, unsigned int len);
667int rds_message_next_extension(struct rds_header *hdr,
668 unsigned int *pos, void *buf, unsigned int *buflen);
669int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
670int rds_message_inc_copy_to_user(struct rds_incoming *inc,
671 struct iovec *first_iov, size_t size);
672void rds_message_inc_free(struct rds_incoming *inc);
673void rds_message_addref(struct rds_message *rm);
674void rds_message_put(struct rds_message *rm);
675void rds_message_wait(struct rds_message *rm);
676void rds_message_unmapped(struct rds_message *rm);
677
678static inline void rds_message_make_checksum(struct rds_header *hdr)
679{
680 hdr->h_csum = 0;
681 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
682}
683
684static inline int rds_message_verify_checksum(const struct rds_header *hdr)
685{
686 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
687}
688
689
690/* page.c */
691int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
692 gfp_t gfp);
693int rds_page_copy_user(struct page *page, unsigned long offset,
694 void __user *ptr, unsigned long bytes,
695 int to_user);
696#define rds_page_copy_to_user(page, offset, ptr, bytes) \
697 rds_page_copy_user(page, offset, ptr, bytes, 1)
698#define rds_page_copy_from_user(page, offset, ptr, bytes) \
699 rds_page_copy_user(page, offset, ptr, bytes, 0)
700void rds_page_exit(void);
701
702/* recv.c */
703void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
704 __be32 saddr);
705void rds_inc_put(struct rds_incoming *inc);
706void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
707 struct rds_incoming *inc, gfp_t gfp, enum km_type km);
708int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
709 size_t size, int msg_flags);
710void rds_clear_recv_queue(struct rds_sock *rs);
711int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
712void rds_inc_info_copy(struct rds_incoming *inc,
713 struct rds_info_iterator *iter,
714 __be32 saddr, __be32 daddr, int flip);
715
716/* send.c */
717int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
718 size_t payload_len);
719void rds_send_reset(struct rds_connection *conn);
720int rds_send_xmit(struct rds_connection *conn);
721struct sockaddr_in;
722void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
723typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
724void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
725 is_acked_func is_acked);
726int rds_send_pong(struct rds_connection *conn, __be16 dport);
727struct rds_message *rds_send_get_message(struct rds_connection *,
728 struct rm_rdma_op *);
729
730/* rdma.c */
731void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
732int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
733int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
734int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
735void rds_rdma_drop_keys(struct rds_sock *rs);
736int rds_rdma_extra_size(struct rds_rdma_args *args);
737int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
738 struct cmsghdr *cmsg);
739int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
740 struct cmsghdr *cmsg);
741int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
742 struct cmsghdr *cmsg);
743int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
744 struct cmsghdr *cmsg);
745void rds_rdma_free_op(struct rm_rdma_op *ro);
746void rds_atomic_free_op(struct rm_atomic_op *ao);
747void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
748void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
749int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
750 struct cmsghdr *cmsg);
751
752extern void __rds_put_mr_final(struct rds_mr *mr);
753static inline void rds_mr_put(struct rds_mr *mr)
754{
755 if (atomic_dec_and_test(&mr->r_refcount))
756 __rds_put_mr_final(mr);
757}
758
759/* stats.c */
760DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
761#define rds_stats_inc_which(which, member) do { \
762 per_cpu(which, get_cpu()).member++; \
763 put_cpu(); \
764} while (0)
765#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
766#define rds_stats_add_which(which, member, count) do { \
767 per_cpu(which, get_cpu()).member += count; \
768 put_cpu(); \
769} while (0)
770#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
771int rds_stats_init(void);
772void rds_stats_exit(void);
773void rds_stats_info_copy(struct rds_info_iterator *iter,
774 uint64_t *values, const char *const *names,
775 size_t nr);
776
777/* sysctl.c */
778int rds_sysctl_init(void);
779void rds_sysctl_exit(void);
780extern unsigned long rds_sysctl_sndbuf_min;
781extern unsigned long rds_sysctl_sndbuf_default;
782extern unsigned long rds_sysctl_sndbuf_max;
783extern unsigned long rds_sysctl_reconnect_min_jiffies;
784extern unsigned long rds_sysctl_reconnect_max_jiffies;
785extern unsigned int rds_sysctl_max_unacked_packets;
786extern unsigned int rds_sysctl_max_unacked_bytes;
787extern unsigned int rds_sysctl_ping_enable;
788extern unsigned long rds_sysctl_trace_flags;
789extern unsigned int rds_sysctl_trace_level;
790
791/* threads.c */
792int rds_threads_init(void);
793void rds_threads_exit(void);
794extern struct workqueue_struct *rds_wq;
795void rds_queue_reconnect(struct rds_connection *conn);
796void rds_connect_worker(struct work_struct *);
797void rds_shutdown_worker(struct work_struct *);
798void rds_send_worker(struct work_struct *);
799void rds_recv_worker(struct work_struct *);
800void rds_connect_complete(struct rds_connection *conn);
801
802/* transport.c */
803int rds_trans_register(struct rds_transport *trans);
804void rds_trans_unregister(struct rds_transport *trans);
805struct rds_transport *rds_trans_get_preferred(__be32 addr);
806void rds_trans_put(struct rds_transport *trans);
807unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
808 unsigned int avail);
809int rds_trans_init(void);
810void rds_trans_exit(void);
811
812#endif
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#include <linux/rhashtable.h>
11
12#include "info.h"
13
14/*
15 * RDS Network protocol version
16 */
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)
23
24/*
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.
29 */
30#define RDS_PORT 18634
31
32#ifdef ATOMIC64_INIT
33#define KERNEL_HAS_ATOMIC64
34#endif
35
36#ifdef DEBUG
37#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
38#else
39/* sigh, pr_debug() causes unused variable warnings */
40static inline __printf(1, 2)
41void rdsdebug(char *fmt, ...)
42{
43}
44#endif
45
46/* XXX is there one of these somewhere? */
47#define ceil(x, y) \
48 ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
49
50#define RDS_FRAG_SHIFT 12
51#define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
52
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)
56
57struct 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 */
72enum {
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#define RDS_IN_XMIT 2
84#define RDS_RECV_REFILL 3
85
86struct rds_connection {
87 struct hlist_node c_hash_node;
88 __be32 c_laddr;
89 __be32 c_faddr;
90 unsigned int c_loopback:1,
91 c_outgoing:1,
92 c_pad_to_32:30;
93 struct rds_connection *c_passive;
94
95 struct rds_cong_map *c_lcong;
96 struct rds_cong_map *c_fcong;
97
98 struct rds_message *c_xmit_rm;
99 unsigned long c_xmit_sg;
100 unsigned int c_xmit_hdr_off;
101 unsigned int c_xmit_data_off;
102 unsigned int c_xmit_atomic_sent;
103 unsigned int c_xmit_rdma_sent;
104 unsigned int c_xmit_data_sent;
105
106 spinlock_t c_lock; /* protect msg queues */
107 u64 c_next_tx_seq;
108 struct list_head c_send_queue;
109 struct list_head c_retrans;
110
111 u64 c_next_rx_seq;
112
113 struct rds_transport *c_trans;
114 void *c_transport_data;
115
116 atomic_t c_state;
117 unsigned long c_send_gen;
118 unsigned long c_flags;
119 unsigned long c_reconnect_jiffies;
120 struct delayed_work c_send_w;
121 struct delayed_work c_recv_w;
122 struct delayed_work c_conn_w;
123 struct work_struct c_down_w;
124 struct mutex c_cm_lock; /* protect conn state & cm */
125 wait_queue_head_t c_waitq;
126
127 struct list_head c_map_item;
128 unsigned long c_map_queued;
129
130 unsigned int c_unacked_packets;
131 unsigned int c_unacked_bytes;
132
133 /* Protocol version */
134 unsigned int c_version;
135 possible_net_t c_net;
136};
137
138static inline
139struct net *rds_conn_net(struct rds_connection *conn)
140{
141 return read_pnet(&conn->c_net);
142}
143
144static inline
145void rds_conn_net_set(struct rds_connection *conn, struct net *net)
146{
147 write_pnet(&conn->c_net, net);
148}
149
150#define RDS_FLAG_CONG_BITMAP 0x01
151#define RDS_FLAG_ACK_REQUIRED 0x02
152#define RDS_FLAG_RETRANSMITTED 0x04
153#define RDS_MAX_ADV_CREDIT 255
154
155/*
156 * Maximum space available for extension headers.
157 */
158#define RDS_HEADER_EXT_SPACE 16
159
160struct rds_header {
161 __be64 h_sequence;
162 __be64 h_ack;
163 __be32 h_len;
164 __be16 h_sport;
165 __be16 h_dport;
166 u8 h_flags;
167 u8 h_credit;
168 u8 h_padding[4];
169 __sum16 h_csum;
170
171 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
172};
173
174/*
175 * Reserved - indicates end of extensions
176 */
177#define RDS_EXTHDR_NONE 0
178
179/*
180 * This extension header is included in the very
181 * first message that is sent on a new connection,
182 * and identifies the protocol level. This will help
183 * rolling updates if a future change requires breaking
184 * the protocol.
185 * NB: This is no longer true for IB, where we do a version
186 * negotiation during the connection setup phase (protocol
187 * version information is included in the RDMA CM private data).
188 */
189#define RDS_EXTHDR_VERSION 1
190struct rds_ext_header_version {
191 __be32 h_version;
192};
193
194/*
195 * This extension header is included in the RDS message
196 * chasing an RDMA operation.
197 */
198#define RDS_EXTHDR_RDMA 2
199struct rds_ext_header_rdma {
200 __be32 h_rdma_rkey;
201};
202
203/*
204 * This extension header tells the peer about the
205 * destination <R_Key,offset> of the requested RDMA
206 * operation.
207 */
208#define RDS_EXTHDR_RDMA_DEST 3
209struct rds_ext_header_rdma_dest {
210 __be32 h_rdma_rkey;
211 __be32 h_rdma_offset;
212};
213
214#define __RDS_EXTHDR_MAX 16 /* for now */
215
216struct rds_incoming {
217 atomic_t i_refcount;
218 struct list_head i_item;
219 struct rds_connection *i_conn;
220 struct rds_header i_hdr;
221 unsigned long i_rx_jiffies;
222 __be32 i_saddr;
223
224 rds_rdma_cookie_t i_rdma_cookie;
225 struct timeval i_rx_tstamp;
226};
227
228struct rds_mr {
229 struct rb_node r_rb_node;
230 atomic_t r_refcount;
231 u32 r_key;
232
233 /* A copy of the creation flags */
234 unsigned int r_use_once:1;
235 unsigned int r_invalidate:1;
236 unsigned int r_write:1;
237
238 /* This is for RDS_MR_DEAD.
239 * It would be nice & consistent to make this part of the above
240 * bit field here, but we need to use test_and_set_bit.
241 */
242 unsigned long r_state;
243 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
244 struct rds_transport *r_trans;
245 void *r_trans_private;
246};
247
248/* Flags for mr->r_state */
249#define RDS_MR_DEAD 0
250
251static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
252{
253 return r_key | (((u64) offset) << 32);
254}
255
256static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
257{
258 return cookie;
259}
260
261static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
262{
263 return cookie >> 32;
264}
265
266/* atomic operation types */
267#define RDS_ATOMIC_TYPE_CSWP 0
268#define RDS_ATOMIC_TYPE_FADD 1
269
270/*
271 * m_sock_item and m_conn_item are on lists that are serialized under
272 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
273 * the message will not be put back on the retransmit list after being sent.
274 * messages that are canceled while being sent rely on this.
275 *
276 * m_inc is used by loopback so that it can pass an incoming message straight
277 * back up into the rx path. It embeds a wire header which is also used by
278 * the send path, which is kind of awkward.
279 *
280 * m_sock_item indicates the message's presence on a socket's send or receive
281 * queue. m_rs will point to that socket.
282 *
283 * m_daddr is used by cancellation to prune messages to a given destination.
284 *
285 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
286 * nesting. As paths iterate over messages on a sock, or conn, they must
287 * also lock the conn, or sock, to remove the message from those lists too.
288 * Testing the flag to determine if the message is still on the lists lets
289 * us avoid testing the list_head directly. That means each path can use
290 * the message's list_head to keep it on a local list while juggling locks
291 * without confusing the other path.
292 *
293 * m_ack_seq is an optional field set by transports who need a different
294 * sequence number range to invalidate. They can use this in a callback
295 * that they pass to rds_send_drop_acked() to see if each message has been
296 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
297 * had ack_seq set yet.
298 */
299#define RDS_MSG_ON_SOCK 1
300#define RDS_MSG_ON_CONN 2
301#define RDS_MSG_HAS_ACK_SEQ 3
302#define RDS_MSG_ACK_REQUIRED 4
303#define RDS_MSG_RETRANSMITTED 5
304#define RDS_MSG_MAPPED 6
305#define RDS_MSG_PAGEVEC 7
306
307struct rds_message {
308 atomic_t m_refcount;
309 struct list_head m_sock_item;
310 struct list_head m_conn_item;
311 struct rds_incoming m_inc;
312 u64 m_ack_seq;
313 __be32 m_daddr;
314 unsigned long m_flags;
315
316 /* Never access m_rs without holding m_rs_lock.
317 * Lock nesting is
318 * rm->m_rs_lock
319 * -> rs->rs_lock
320 */
321 spinlock_t m_rs_lock;
322 wait_queue_head_t m_flush_wait;
323
324 struct rds_sock *m_rs;
325
326 /* cookie to send to remote, in rds header */
327 rds_rdma_cookie_t m_rdma_cookie;
328
329 unsigned int m_used_sgs;
330 unsigned int m_total_sgs;
331
332 void *m_final_op;
333
334 struct {
335 struct rm_atomic_op {
336 int op_type;
337 union {
338 struct {
339 uint64_t compare;
340 uint64_t swap;
341 uint64_t compare_mask;
342 uint64_t swap_mask;
343 } op_m_cswp;
344 struct {
345 uint64_t add;
346 uint64_t nocarry_mask;
347 } op_m_fadd;
348 };
349
350 u32 op_rkey;
351 u64 op_remote_addr;
352 unsigned int op_notify:1;
353 unsigned int op_recverr:1;
354 unsigned int op_mapped:1;
355 unsigned int op_silent:1;
356 unsigned int op_active:1;
357 struct scatterlist *op_sg;
358 struct rds_notifier *op_notifier;
359
360 struct rds_mr *op_rdma_mr;
361 } atomic;
362 struct rm_rdma_op {
363 u32 op_rkey;
364 u64 op_remote_addr;
365 unsigned int op_write:1;
366 unsigned int op_fence:1;
367 unsigned int op_notify:1;
368 unsigned int op_recverr:1;
369 unsigned int op_mapped:1;
370 unsigned int op_silent:1;
371 unsigned int op_active:1;
372 unsigned int op_bytes;
373 unsigned int op_nents;
374 unsigned int op_count;
375 struct scatterlist *op_sg;
376 struct rds_notifier *op_notifier;
377
378 struct rds_mr *op_rdma_mr;
379 } rdma;
380 struct rm_data_op {
381 unsigned int op_active:1;
382 unsigned int op_nents;
383 unsigned int op_count;
384 unsigned int op_dmasg;
385 unsigned int op_dmaoff;
386 struct scatterlist *op_sg;
387 } data;
388 };
389};
390
391/*
392 * The RDS notifier is used (optionally) to tell the application about
393 * completed RDMA operations. Rather than keeping the whole rds message
394 * around on the queue, we allocate a small notifier that is put on the
395 * socket's notifier_list. Notifications are delivered to the application
396 * through control messages.
397 */
398struct rds_notifier {
399 struct list_head n_list;
400 uint64_t n_user_token;
401 int n_status;
402};
403
404/**
405 * struct rds_transport - transport specific behavioural hooks
406 *
407 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
408 * part of a message. The caller serializes on the send_sem so this
409 * doesn't need to be reentrant for a given conn. The header must be
410 * sent before the data payload. .xmit must be prepared to send a
411 * message with no data payload. .xmit should return the number of
412 * bytes that were sent down the connection, including header bytes.
413 * Returning 0 tells the caller that it doesn't need to perform any
414 * additional work now. This is usually the case when the transport has
415 * filled the sending queue for its connection and will handle
416 * triggering the rds thread to continue the send when space becomes
417 * available. Returning -EAGAIN tells the caller to retry the send
418 * immediately. Returning -ENOMEM tells the caller to retry the send at
419 * some point in the future.
420 *
421 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
422 * it returns the connection can not call rds_recv_incoming().
423 * This will only be called once after conn_connect returns
424 * non-zero success and will The caller serializes this with
425 * the send and connecting paths (xmit_* and conn_*). The
426 * transport is responsible for other serialization, including
427 * rds_recv_incoming(). This is called in process context but
428 * should try hard not to block.
429 */
430
431struct rds_transport {
432 char t_name[TRANSNAMSIZ];
433 struct list_head t_item;
434 struct module *t_owner;
435 unsigned int t_prefer_loopback:1;
436 unsigned int t_type;
437
438 int (*laddr_check)(struct net *net, __be32 addr);
439 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
440 void (*conn_free)(void *data);
441 int (*conn_connect)(struct rds_connection *conn);
442 void (*conn_shutdown)(struct rds_connection *conn);
443 void (*xmit_prepare)(struct rds_connection *conn);
444 void (*xmit_complete)(struct rds_connection *conn);
445 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
446 unsigned int hdr_off, unsigned int sg, unsigned int off);
447 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
448 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
449 int (*recv)(struct rds_connection *conn);
450 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
451 void (*inc_free)(struct rds_incoming *inc);
452
453 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
454 struct rdma_cm_event *event);
455 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
456 void (*cm_connect_complete)(struct rds_connection *conn,
457 struct rdma_cm_event *event);
458
459 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
460 unsigned int avail);
461 void (*exit)(void);
462 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
463 struct rds_sock *rs, u32 *key_ret);
464 void (*sync_mr)(void *trans_private, int direction);
465 void (*free_mr)(void *trans_private, int invalidate);
466 void (*flush_mrs)(void);
467};
468
469struct rds_sock {
470 struct sock rs_sk;
471
472 u64 rs_user_addr;
473 u64 rs_user_bytes;
474
475 /*
476 * bound_addr used for both incoming and outgoing, no INADDR_ANY
477 * support.
478 */
479 struct rhash_head rs_bound_node;
480 u64 rs_bound_key;
481 __be32 rs_bound_addr;
482 __be32 rs_conn_addr;
483 __be16 rs_bound_port;
484 __be16 rs_conn_port;
485 struct rds_transport *rs_transport;
486
487 /*
488 * rds_sendmsg caches the conn it used the last time around.
489 * This helps avoid costly lookups.
490 */
491 struct rds_connection *rs_conn;
492
493 /* flag indicating we were congested or not */
494 int rs_congested;
495 /* seen congestion (ENOBUFS) when sending? */
496 int rs_seen_congestion;
497
498 /* rs_lock protects all these adjacent members before the newline */
499 spinlock_t rs_lock;
500 struct list_head rs_send_queue;
501 u32 rs_snd_bytes;
502 int rs_rcv_bytes;
503 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
504
505 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
506 * to decide whether the application should be woken up.
507 * If not set, we use rs_cong_track to find out whether a cong map
508 * update arrived.
509 */
510 uint64_t rs_cong_mask;
511 uint64_t rs_cong_notify;
512 struct list_head rs_cong_list;
513 unsigned long rs_cong_track;
514
515 /*
516 * rs_recv_lock protects the receive queue, and is
517 * used to serialize with rds_release.
518 */
519 rwlock_t rs_recv_lock;
520 struct list_head rs_recv_queue;
521
522 /* just for stats reporting */
523 struct list_head rs_item;
524
525 /* these have their own lock */
526 spinlock_t rs_rdma_lock;
527 struct rb_root rs_rdma_keys;
528
529 /* Socket options - in case there will be more */
530 unsigned char rs_recverr,
531 rs_cong_monitor;
532};
533
534static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
535{
536 return container_of(sk, struct rds_sock, rs_sk);
537}
538static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
539{
540 return &rs->rs_sk;
541}
542
543/*
544 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
545 * to account for overhead. We don't account for overhead, we just apply
546 * the number of payload bytes to the specified value.
547 */
548static inline int rds_sk_sndbuf(struct rds_sock *rs)
549{
550 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
551}
552static inline int rds_sk_rcvbuf(struct rds_sock *rs)
553{
554 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
555}
556
557struct rds_statistics {
558 uint64_t s_conn_reset;
559 uint64_t s_recv_drop_bad_checksum;
560 uint64_t s_recv_drop_old_seq;
561 uint64_t s_recv_drop_no_sock;
562 uint64_t s_recv_drop_dead_sock;
563 uint64_t s_recv_deliver_raced;
564 uint64_t s_recv_delivered;
565 uint64_t s_recv_queued;
566 uint64_t s_recv_immediate_retry;
567 uint64_t s_recv_delayed_retry;
568 uint64_t s_recv_ack_required;
569 uint64_t s_recv_rdma_bytes;
570 uint64_t s_recv_ping;
571 uint64_t s_send_queue_empty;
572 uint64_t s_send_queue_full;
573 uint64_t s_send_lock_contention;
574 uint64_t s_send_lock_queue_raced;
575 uint64_t s_send_immediate_retry;
576 uint64_t s_send_delayed_retry;
577 uint64_t s_send_drop_acked;
578 uint64_t s_send_ack_required;
579 uint64_t s_send_queued;
580 uint64_t s_send_rdma;
581 uint64_t s_send_rdma_bytes;
582 uint64_t s_send_pong;
583 uint64_t s_page_remainder_hit;
584 uint64_t s_page_remainder_miss;
585 uint64_t s_copy_to_user;
586 uint64_t s_copy_from_user;
587 uint64_t s_cong_update_queued;
588 uint64_t s_cong_update_received;
589 uint64_t s_cong_send_error;
590 uint64_t s_cong_send_blocked;
591};
592
593/* af_rds.c */
594void rds_sock_addref(struct rds_sock *rs);
595void rds_sock_put(struct rds_sock *rs);
596void rds_wake_sk_sleep(struct rds_sock *rs);
597static inline void __rds_wake_sk_sleep(struct sock *sk)
598{
599 wait_queue_head_t *waitq = sk_sleep(sk);
600
601 if (!sock_flag(sk, SOCK_DEAD) && waitq)
602 wake_up(waitq);
603}
604extern wait_queue_head_t rds_poll_waitq;
605
606
607/* bind.c */
608int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
609void rds_remove_bound(struct rds_sock *rs);
610struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
611int rds_bind_lock_init(void);
612void rds_bind_lock_destroy(void);
613
614/* cong.c */
615int rds_cong_get_maps(struct rds_connection *conn);
616void rds_cong_add_conn(struct rds_connection *conn);
617void rds_cong_remove_conn(struct rds_connection *conn);
618void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
619void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
620int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
621void rds_cong_queue_updates(struct rds_cong_map *map);
622void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
623int rds_cong_updated_since(unsigned long *recent);
624void rds_cong_add_socket(struct rds_sock *);
625void rds_cong_remove_socket(struct rds_sock *);
626void rds_cong_exit(void);
627struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
628
629/* conn.c */
630int rds_conn_init(void);
631void rds_conn_exit(void);
632struct rds_connection *rds_conn_create(struct net *net,
633 __be32 laddr, __be32 faddr,
634 struct rds_transport *trans, gfp_t gfp);
635struct rds_connection *rds_conn_create_outgoing(struct net *net,
636 __be32 laddr, __be32 faddr,
637 struct rds_transport *trans, gfp_t gfp);
638void rds_conn_shutdown(struct rds_connection *conn);
639void rds_conn_destroy(struct rds_connection *conn);
640void rds_conn_drop(struct rds_connection *conn);
641void rds_conn_connect_if_down(struct rds_connection *conn);
642void rds_for_each_conn_info(struct socket *sock, unsigned int len,
643 struct rds_info_iterator *iter,
644 struct rds_info_lengths *lens,
645 int (*visitor)(struct rds_connection *, void *),
646 size_t item_len);
647__printf(2, 3)
648void __rds_conn_error(struct rds_connection *conn, const char *, ...);
649#define rds_conn_error(conn, fmt...) \
650 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
651
652static inline int
653rds_conn_transition(struct rds_connection *conn, int old, int new)
654{
655 return atomic_cmpxchg(&conn->c_state, old, new) == old;
656}
657
658static inline int
659rds_conn_state(struct rds_connection *conn)
660{
661 return atomic_read(&conn->c_state);
662}
663
664static inline int
665rds_conn_up(struct rds_connection *conn)
666{
667 return atomic_read(&conn->c_state) == RDS_CONN_UP;
668}
669
670static inline int
671rds_conn_connecting(struct rds_connection *conn)
672{
673 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
674}
675
676/* message.c */
677struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
678struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
679int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
680struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
681void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
682 __be16 dport, u64 seq);
683int rds_message_add_extension(struct rds_header *hdr,
684 unsigned int type, const void *data, unsigned int len);
685int rds_message_next_extension(struct rds_header *hdr,
686 unsigned int *pos, void *buf, unsigned int *buflen);
687int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
688int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
689void rds_message_inc_free(struct rds_incoming *inc);
690void rds_message_addref(struct rds_message *rm);
691void rds_message_put(struct rds_message *rm);
692void rds_message_wait(struct rds_message *rm);
693void rds_message_unmapped(struct rds_message *rm);
694
695static inline void rds_message_make_checksum(struct rds_header *hdr)
696{
697 hdr->h_csum = 0;
698 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
699}
700
701static inline int rds_message_verify_checksum(const struct rds_header *hdr)
702{
703 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
704}
705
706
707/* page.c */
708int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
709 gfp_t gfp);
710int rds_page_copy_user(struct page *page, unsigned long offset,
711 void __user *ptr, unsigned long bytes,
712 int to_user);
713#define rds_page_copy_to_user(page, offset, ptr, bytes) \
714 rds_page_copy_user(page, offset, ptr, bytes, 1)
715#define rds_page_copy_from_user(page, offset, ptr, bytes) \
716 rds_page_copy_user(page, offset, ptr, bytes, 0)
717void rds_page_exit(void);
718
719/* recv.c */
720void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
721 __be32 saddr);
722void rds_inc_put(struct rds_incoming *inc);
723void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
724 struct rds_incoming *inc, gfp_t gfp);
725int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
726 int msg_flags);
727void rds_clear_recv_queue(struct rds_sock *rs);
728int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
729void rds_inc_info_copy(struct rds_incoming *inc,
730 struct rds_info_iterator *iter,
731 __be32 saddr, __be32 daddr, int flip);
732
733/* send.c */
734int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
735void rds_send_reset(struct rds_connection *conn);
736int rds_send_xmit(struct rds_connection *conn);
737struct sockaddr_in;
738void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
739typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
740void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
741 is_acked_func is_acked);
742int rds_send_pong(struct rds_connection *conn, __be16 dport);
743struct rds_message *rds_send_get_message(struct rds_connection *,
744 struct rm_rdma_op *);
745
746/* rdma.c */
747void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
748int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
749int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
750int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
751void rds_rdma_drop_keys(struct rds_sock *rs);
752int rds_rdma_extra_size(struct rds_rdma_args *args);
753int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
754 struct cmsghdr *cmsg);
755int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
756 struct cmsghdr *cmsg);
757int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
758 struct cmsghdr *cmsg);
759int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
760 struct cmsghdr *cmsg);
761void rds_rdma_free_op(struct rm_rdma_op *ro);
762void rds_atomic_free_op(struct rm_atomic_op *ao);
763void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
764void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
765int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
766 struct cmsghdr *cmsg);
767
768void __rds_put_mr_final(struct rds_mr *mr);
769static inline void rds_mr_put(struct rds_mr *mr)
770{
771 if (atomic_dec_and_test(&mr->r_refcount))
772 __rds_put_mr_final(mr);
773}
774
775/* stats.c */
776DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
777#define rds_stats_inc_which(which, member) do { \
778 per_cpu(which, get_cpu()).member++; \
779 put_cpu(); \
780} while (0)
781#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
782#define rds_stats_add_which(which, member, count) do { \
783 per_cpu(which, get_cpu()).member += count; \
784 put_cpu(); \
785} while (0)
786#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
787int rds_stats_init(void);
788void rds_stats_exit(void);
789void rds_stats_info_copy(struct rds_info_iterator *iter,
790 uint64_t *values, const char *const *names,
791 size_t nr);
792
793/* sysctl.c */
794int rds_sysctl_init(void);
795void rds_sysctl_exit(void);
796extern unsigned long rds_sysctl_sndbuf_min;
797extern unsigned long rds_sysctl_sndbuf_default;
798extern unsigned long rds_sysctl_sndbuf_max;
799extern unsigned long rds_sysctl_reconnect_min_jiffies;
800extern unsigned long rds_sysctl_reconnect_max_jiffies;
801extern unsigned int rds_sysctl_max_unacked_packets;
802extern unsigned int rds_sysctl_max_unacked_bytes;
803extern unsigned int rds_sysctl_ping_enable;
804extern unsigned long rds_sysctl_trace_flags;
805extern unsigned int rds_sysctl_trace_level;
806
807/* threads.c */
808int rds_threads_init(void);
809void rds_threads_exit(void);
810extern struct workqueue_struct *rds_wq;
811void rds_queue_reconnect(struct rds_connection *conn);
812void rds_connect_worker(struct work_struct *);
813void rds_shutdown_worker(struct work_struct *);
814void rds_send_worker(struct work_struct *);
815void rds_recv_worker(struct work_struct *);
816void rds_connect_complete(struct rds_connection *conn);
817
818/* transport.c */
819int rds_trans_register(struct rds_transport *trans);
820void rds_trans_unregister(struct rds_transport *trans);
821struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
822void rds_trans_put(struct rds_transport *trans);
823unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
824 unsigned int avail);
825struct rds_transport *rds_trans_get(int t_type);
826int rds_trans_init(void);
827void rds_trans_exit(void);
828
829#endif