Root/net/rds/rds.h

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_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
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
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 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 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
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
246struct 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 */
277struct 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#define RDS_TRANS_IB 0
315#define RDS_TRANS_IWARP 1
316#define RDS_TRANS_TCP 2
317#define RDS_TRANS_COUNT 3
318
319struct rds_transport {
320    char t_name[TRANSNAMSIZ];
321    struct list_head t_item;
322    struct module *t_owner;
323    unsigned int t_prefer_loopback:1;
324    unsigned int t_type;
325
326    int (*laddr_check)(__be32 addr);
327    int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
328    void (*conn_free)(void *data);
329    int (*conn_connect)(struct rds_connection *conn);
330    void (*conn_shutdown)(struct rds_connection *conn);
331    void (*xmit_prepare)(struct rds_connection *conn);
332    void (*xmit_complete)(struct rds_connection *conn);
333    int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
334            unsigned int hdr_off, unsigned int sg, unsigned int off);
335    int (*xmit_cong_map)(struct rds_connection *conn,
336                 struct rds_cong_map *map, unsigned long offset);
337    int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op);
338    int (*recv)(struct rds_connection *conn);
339    int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov,
340                size_t size);
341    void (*inc_purge)(struct rds_incoming *inc);
342    void (*inc_free)(struct rds_incoming *inc);
343
344    int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
345                 struct rdma_cm_event *event);
346    int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
347    void (*cm_connect_complete)(struct rds_connection *conn,
348                    struct rdma_cm_event *event);
349
350    unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
351                    unsigned int avail);
352    void (*exit)(void);
353    void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
354            struct rds_sock *rs, u32 *key_ret);
355    void (*sync_mr)(void *trans_private, int direction);
356    void (*free_mr)(void *trans_private, int invalidate);
357    void (*flush_mrs)(void);
358};
359
360struct rds_sock {
361    struct sock rs_sk;
362
363    u64 rs_user_addr;
364    u64 rs_user_bytes;
365
366    /*
367     * bound_addr used for both incoming and outgoing, no INADDR_ANY
368     * support.
369     */
370    struct rb_node rs_bound_node;
371    __be32 rs_bound_addr;
372    __be32 rs_conn_addr;
373    __be16 rs_bound_port;
374    __be16 rs_conn_port;
375
376    /*
377     * This is only used to communicate the transport between bind and
378     * initiating connections. All other trans use is referenced through
379     * the connection.
380     */
381    struct rds_transport *rs_transport;
382
383    /*
384     * rds_sendmsg caches the conn it used the last time around.
385     * This helps avoid costly lookups.
386     */
387    struct rds_connection *rs_conn;
388
389    /* flag indicating we were congested or not */
390    int rs_congested;
391
392    /* rs_lock protects all these adjacent members before the newline */
393    spinlock_t rs_lock;
394    struct list_head rs_send_queue;
395    u32 rs_snd_bytes;
396    int rs_rcv_bytes;
397    struct list_head rs_notify_queue; /* currently used for failed RDMAs */
398
399    /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
400     * to decide whether the application should be woken up.
401     * If not set, we use rs_cong_track to find out whether a cong map
402     * update arrived.
403     */
404    uint64_t rs_cong_mask;
405    uint64_t rs_cong_notify;
406    struct list_head rs_cong_list;
407    unsigned long rs_cong_track;
408
409    /*
410     * rs_recv_lock protects the receive queue, and is
411     * used to serialize with rds_release.
412     */
413    rwlock_t rs_recv_lock;
414    struct list_head rs_recv_queue;
415
416    /* just for stats reporting */
417    struct list_head rs_item;
418
419    /* these have their own lock */
420    spinlock_t rs_rdma_lock;
421    struct rb_root rs_rdma_keys;
422
423    /* Socket options - in case there will be more */
424    unsigned char rs_recverr,
425                rs_cong_monitor;
426};
427
428static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
429{
430    return container_of(sk, struct rds_sock, rs_sk);
431}
432static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
433{
434    return &rs->rs_sk;
435}
436
437/*
438 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
439 * to account for overhead. We don't account for overhead, we just apply
440 * the number of payload bytes to the specified value.
441 */
442static inline int rds_sk_sndbuf(struct rds_sock *rs)
443{
444    return rds_rs_to_sk(rs)->sk_sndbuf / 2;
445}
446static inline int rds_sk_rcvbuf(struct rds_sock *rs)
447{
448    return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
449}
450
451struct rds_statistics {
452    uint64_t s_conn_reset;
453    uint64_t s_recv_drop_bad_checksum;
454    uint64_t s_recv_drop_old_seq;
455    uint64_t s_recv_drop_no_sock;
456    uint64_t s_recv_drop_dead_sock;
457    uint64_t s_recv_deliver_raced;
458    uint64_t s_recv_delivered;
459    uint64_t s_recv_queued;
460    uint64_t s_recv_immediate_retry;
461    uint64_t s_recv_delayed_retry;
462    uint64_t s_recv_ack_required;
463    uint64_t s_recv_rdma_bytes;
464    uint64_t s_recv_ping;
465    uint64_t s_send_queue_empty;
466    uint64_t s_send_queue_full;
467    uint64_t s_send_sem_contention;
468    uint64_t s_send_sem_queue_raced;
469    uint64_t s_send_immediate_retry;
470    uint64_t s_send_delayed_retry;
471    uint64_t s_send_drop_acked;
472    uint64_t s_send_ack_required;
473    uint64_t s_send_queued;
474    uint64_t s_send_rdma;
475    uint64_t s_send_rdma_bytes;
476    uint64_t s_send_pong;
477    uint64_t s_page_remainder_hit;
478    uint64_t s_page_remainder_miss;
479    uint64_t s_copy_to_user;
480    uint64_t s_copy_from_user;
481    uint64_t s_cong_update_queued;
482    uint64_t s_cong_update_received;
483    uint64_t s_cong_send_error;
484    uint64_t s_cong_send_blocked;
485};
486
487/* af_rds.c */
488void rds_sock_addref(struct rds_sock *rs);
489void rds_sock_put(struct rds_sock *rs);
490void rds_wake_sk_sleep(struct rds_sock *rs);
491static inline void __rds_wake_sk_sleep(struct sock *sk)
492{
493    wait_queue_head_t *waitq = sk->sk_sleep;
494
495    if (!sock_flag(sk, SOCK_DEAD) && waitq)
496        wake_up(waitq);
497}
498extern wait_queue_head_t rds_poll_waitq;
499
500
501/* bind.c */
502int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
503void rds_remove_bound(struct rds_sock *rs);
504struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
505
506/* cong.c */
507int rds_cong_get_maps(struct rds_connection *conn);
508void rds_cong_add_conn(struct rds_connection *conn);
509void rds_cong_remove_conn(struct rds_connection *conn);
510void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
511void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
512int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
513void rds_cong_queue_updates(struct rds_cong_map *map);
514void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
515int rds_cong_updated_since(unsigned long *recent);
516void rds_cong_add_socket(struct rds_sock *);
517void rds_cong_remove_socket(struct rds_sock *);
518void rds_cong_exit(void);
519struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
520
521/* conn.c */
522int __init rds_conn_init(void);
523void rds_conn_exit(void);
524struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr,
525                       struct rds_transport *trans, gfp_t gfp);
526struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr,
527                   struct rds_transport *trans, gfp_t gfp);
528void rds_conn_destroy(struct rds_connection *conn);
529void rds_conn_reset(struct rds_connection *conn);
530void rds_conn_drop(struct rds_connection *conn);
531void rds_for_each_conn_info(struct socket *sock, unsigned int len,
532              struct rds_info_iterator *iter,
533              struct rds_info_lengths *lens,
534              int (*visitor)(struct rds_connection *, void *),
535              size_t item_len);
536void __rds_conn_error(struct rds_connection *conn, const char *, ...)
537                __attribute__ ((format (printf, 2, 3)));
538#define rds_conn_error(conn, fmt...) \
539    __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
540
541static inline int
542rds_conn_transition(struct rds_connection *conn, int old, int new)
543{
544    return atomic_cmpxchg(&conn->c_state, old, new) == old;
545}
546
547static inline int
548rds_conn_state(struct rds_connection *conn)
549{
550    return atomic_read(&conn->c_state);
551}
552
553static inline int
554rds_conn_up(struct rds_connection *conn)
555{
556    return atomic_read(&conn->c_state) == RDS_CONN_UP;
557}
558
559static inline int
560rds_conn_connecting(struct rds_connection *conn)
561{
562    return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
563}
564
565/* message.c */
566struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
567struct rds_message *rds_message_copy_from_user(struct iovec *first_iov,
568                           size_t total_len);
569struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
570void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
571                 __be16 dport, u64 seq);
572int rds_message_add_extension(struct rds_header *hdr,
573                  unsigned int type, const void *data, unsigned int len);
574int rds_message_next_extension(struct rds_header *hdr,
575                   unsigned int *pos, void *buf, unsigned int *buflen);
576int rds_message_add_version_extension(struct rds_header *hdr, unsigned int version);
577int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version);
578int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
579int rds_message_inc_copy_to_user(struct rds_incoming *inc,
580                 struct iovec *first_iov, size_t size);
581void rds_message_inc_purge(struct rds_incoming *inc);
582void rds_message_inc_free(struct rds_incoming *inc);
583void rds_message_addref(struct rds_message *rm);
584void rds_message_put(struct rds_message *rm);
585void rds_message_wait(struct rds_message *rm);
586void rds_message_unmapped(struct rds_message *rm);
587
588static inline void rds_message_make_checksum(struct rds_header *hdr)
589{
590    hdr->h_csum = 0;
591    hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
592}
593
594static inline int rds_message_verify_checksum(const struct rds_header *hdr)
595{
596    return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
597}
598
599
600/* page.c */
601int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
602                 gfp_t gfp);
603int rds_page_copy_user(struct page *page, unsigned long offset,
604               void __user *ptr, unsigned long bytes,
605               int to_user);
606#define rds_page_copy_to_user(page, offset, ptr, bytes) \
607    rds_page_copy_user(page, offset, ptr, bytes, 1)
608#define rds_page_copy_from_user(page, offset, ptr, bytes) \
609    rds_page_copy_user(page, offset, ptr, bytes, 0)
610void rds_page_exit(void);
611
612/* recv.c */
613void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
614          __be32 saddr);
615void rds_inc_addref(struct rds_incoming *inc);
616void rds_inc_put(struct rds_incoming *inc);
617void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
618               struct rds_incoming *inc, gfp_t gfp, enum km_type km);
619int rds_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
620        size_t size, int msg_flags);
621void rds_clear_recv_queue(struct rds_sock *rs);
622int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
623void rds_inc_info_copy(struct rds_incoming *inc,
624               struct rds_info_iterator *iter,
625               __be32 saddr, __be32 daddr, int flip);
626
627/* send.c */
628int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
629        size_t payload_len);
630void rds_send_reset(struct rds_connection *conn);
631int rds_send_xmit(struct rds_connection *conn);
632struct sockaddr_in;
633void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
634typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
635void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
636             is_acked_func is_acked);
637int rds_send_acked_before(struct rds_connection *conn, u64 seq);
638void rds_send_remove_from_sock(struct list_head *messages, int status);
639int rds_send_pong(struct rds_connection *conn, __be16 dport);
640struct rds_message *rds_send_get_message(struct rds_connection *,
641                     struct rds_rdma_op *);
642
643/* rdma.c */
644void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
645
646/* stats.c */
647DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
648#define rds_stats_inc_which(which, member) do { \
649    per_cpu(which, get_cpu()).member++; \
650    put_cpu(); \
651} while (0)
652#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
653#define rds_stats_add_which(which, member, count) do { \
654    per_cpu(which, get_cpu()).member += count; \
655    put_cpu(); \
656} while (0)
657#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
658int __init rds_stats_init(void);
659void rds_stats_exit(void);
660void rds_stats_info_copy(struct rds_info_iterator *iter,
661             uint64_t *values, const char *const *names,
662             size_t nr);
663
664/* sysctl.c */
665int __init rds_sysctl_init(void);
666void rds_sysctl_exit(void);
667extern unsigned long rds_sysctl_sndbuf_min;
668extern unsigned long rds_sysctl_sndbuf_default;
669extern unsigned long rds_sysctl_sndbuf_max;
670extern unsigned long rds_sysctl_reconnect_min_jiffies;
671extern unsigned long rds_sysctl_reconnect_max_jiffies;
672extern unsigned int rds_sysctl_max_unacked_packets;
673extern unsigned int rds_sysctl_max_unacked_bytes;
674extern unsigned int rds_sysctl_ping_enable;
675extern unsigned long rds_sysctl_trace_flags;
676extern unsigned int rds_sysctl_trace_level;
677
678/* threads.c */
679int __init rds_threads_init(void);
680void rds_threads_exit(void);
681extern struct workqueue_struct *rds_wq;
682void rds_connect_worker(struct work_struct *);
683void rds_shutdown_worker(struct work_struct *);
684void rds_send_worker(struct work_struct *);
685void rds_recv_worker(struct work_struct *);
686void rds_connect_complete(struct rds_connection *conn);
687
688/* transport.c */
689int rds_trans_register(struct rds_transport *trans);
690void rds_trans_unregister(struct rds_transport *trans);
691struct rds_transport *rds_trans_get_preferred(__be32 addr);
692unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
693                       unsigned int avail);
694int __init rds_trans_init(void);
695void rds_trans_exit(void);
696
697#endif
698

Archive Download this file



interactive