1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __FS_CEPH_MESSENGER_H
3 #define __FS_CEPH_MESSENGER_H
5 #include <linux/bvec.h>
6 #include <linux/kref.h>
7 #include <linux/mutex.h>
9 #include <linux/radix-tree.h>
10 #include <linux/uio.h>
11 #include <linux/workqueue.h>
12 #include <net/net_namespace.h>
14 #include <linux/ceph/types.h>
15 #include <linux/ceph/buffer.h>
18 struct ceph_connection
;
21 * Ceph defines these callbacks for handling connection events.
23 struct ceph_connection_operations
{
24 struct ceph_connection
*(*get
)(struct ceph_connection
*);
25 void (*put
)(struct ceph_connection
*);
27 /* handle an incoming message. */
28 void (*dispatch
) (struct ceph_connection
*con
, struct ceph_msg
*m
);
30 /* authorize an outgoing connection */
31 struct ceph_auth_handshake
*(*get_authorizer
) (
32 struct ceph_connection
*con
,
33 int *proto
, int force_new
);
34 int (*add_authorizer_challenge
)(struct ceph_connection
*con
,
36 int challenge_buf_len
);
37 int (*verify_authorizer_reply
) (struct ceph_connection
*con
);
38 int (*invalidate_authorizer
)(struct ceph_connection
*con
);
40 /* there was some error on the socket (disconnect, whatever) */
41 void (*fault
) (struct ceph_connection
*con
);
43 /* a remote host as terminated a message exchange session, and messages
44 * we sent (or they tried to send us) may be lost. */
45 void (*peer_reset
) (struct ceph_connection
*con
);
47 struct ceph_msg
* (*alloc_msg
) (struct ceph_connection
*con
,
48 struct ceph_msg_header
*hdr
,
51 void (*reencode_message
) (struct ceph_msg
*msg
);
53 int (*sign_message
) (struct ceph_msg
*msg
);
54 int (*check_message_signature
) (struct ceph_msg
*msg
);
57 /* use format string %s%lld */
58 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
60 struct ceph_messenger
{
61 struct ceph_entity_inst inst
; /* my name+address */
62 struct ceph_entity_addr my_enc_addr
;
68 * the global_seq counts connections i (attempt to) initiate
69 * in order to disambiguate certain connect race conditions.
72 spinlock_t global_seq_lock
;
75 enum ceph_msg_data_type
{
76 CEPH_MSG_DATA_NONE
, /* message contains no data payload */
77 CEPH_MSG_DATA_PAGES
, /* data source/destination is a page array */
78 CEPH_MSG_DATA_PAGELIST
, /* data source/destination is a pagelist */
80 CEPH_MSG_DATA_BIO
, /* data source/destination is a bio list */
81 #endif /* CONFIG_BLOCK */
82 CEPH_MSG_DATA_BVECS
, /* data source/destination is a bio_vec array */
87 struct ceph_bio_iter
{
89 struct bvec_iter iter
;
92 #define __ceph_bio_iter_advance_step(it, n, STEP) do { \
93 unsigned int __n = (n), __cur_n; \
96 BUG_ON(!(it)->iter.bi_size); \
97 __cur_n = min((it)->iter.bi_size, __n); \
99 bio_advance_iter((it)->bio, &(it)->iter, __cur_n); \
100 if (!(it)->iter.bi_size && (it)->bio->bi_next) { \
101 dout("__ceph_bio_iter_advance_step next bio\n"); \
102 (it)->bio = (it)->bio->bi_next; \
103 (it)->iter = (it)->bio->bi_iter; \
110 * Advance @it by @n bytes.
112 #define ceph_bio_iter_advance(it, n) \
113 __ceph_bio_iter_advance_step(it, n, 0)
116 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
118 #define ceph_bio_iter_advance_step(it, n, BVEC_STEP) \
119 __ceph_bio_iter_advance_step(it, n, ({ \
121 struct bvec_iter __cur_iter; \
123 __cur_iter = (it)->iter; \
124 __cur_iter.bi_size = __cur_n; \
125 __bio_for_each_segment(bv, (it)->bio, __cur_iter, __cur_iter) \
129 #endif /* CONFIG_BLOCK */
131 struct ceph_bvec_iter
{
132 struct bio_vec
*bvecs
;
133 struct bvec_iter iter
;
136 #define __ceph_bvec_iter_advance_step(it, n, STEP) do { \
137 BUG_ON((n) > (it)->iter.bi_size); \
139 bvec_iter_advance((it)->bvecs, &(it)->iter, (n)); \
143 * Advance @it by @n bytes.
145 #define ceph_bvec_iter_advance(it, n) \
146 __ceph_bvec_iter_advance_step(it, n, 0)
149 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
151 #define ceph_bvec_iter_advance_step(it, n, BVEC_STEP) \
152 __ceph_bvec_iter_advance_step(it, n, ({ \
154 struct bvec_iter __cur_iter; \
156 __cur_iter = (it)->iter; \
157 __cur_iter.bi_size = (n); \
158 for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter) \
162 #define ceph_bvec_iter_shorten(it, n) do { \
163 BUG_ON((n) > (it)->iter.bi_size); \
164 (it)->iter.bi_size = (n); \
167 struct ceph_msg_data
{
168 enum ceph_msg_data_type type
;
172 struct ceph_bio_iter bio_pos
;
175 #endif /* CONFIG_BLOCK */
176 struct ceph_bvec_iter bvec_pos
;
179 size_t length
; /* total # bytes */
180 unsigned int alignment
; /* first page */
183 struct ceph_pagelist
*pagelist
;
187 struct ceph_msg_data_cursor
{
188 size_t total_resid
; /* across all data items */
190 struct ceph_msg_data
*data
; /* current data item */
191 size_t resid
; /* bytes not yet consumed */
192 bool last_piece
; /* current is last piece */
193 bool need_crc
; /* crc update needed */
196 struct ceph_bio_iter bio_iter
;
197 #endif /* CONFIG_BLOCK */
198 struct bvec_iter bvec_iter
;
200 unsigned int page_offset
; /* offset in page */
201 unsigned short page_index
; /* index in array */
202 unsigned short page_count
; /* pages in array */
204 struct { /* pagelist */
205 struct page
*page
; /* page from list */
206 size_t offset
; /* bytes from list */
212 * a single message. it contains a header (src, dest, message type, etc.),
213 * footer (crc values, mainly), a "front" message body, and possibly a
214 * data payload (stored in some number of pages).
217 struct ceph_msg_header hdr
; /* header */
219 struct ceph_msg_footer footer
; /* footer */
220 struct ceph_msg_footer_old old_footer
; /* old format footer */
222 struct kvec front
; /* unaligned blobs of message */
223 struct ceph_buffer
*middle
;
226 struct ceph_msg_data
*data
;
229 struct ceph_msg_data_cursor cursor
;
231 struct ceph_connection
*con
;
232 struct list_head list_head
; /* links for connection lists */
239 struct ceph_msgpool
*pool
;
245 #define CEPH_CON_S_CLOSED 1
246 #define CEPH_CON_S_PREOPEN 2
247 #define CEPH_CON_S_V1_BANNER 3
248 #define CEPH_CON_S_V1_CONNECT_MSG 4
249 #define CEPH_CON_S_OPEN 5
250 #define CEPH_CON_S_STANDBY 6
253 * ceph_connection flag bits
255 #define CEPH_CON_F_LOSSYTX 0 /* we can close channel or drop
256 messages on errors */
257 #define CEPH_CON_F_KEEPALIVE_PENDING 1 /* we need to send a keepalive */
258 #define CEPH_CON_F_WRITE_PENDING 2 /* we have data ready to send */
259 #define CEPH_CON_F_SOCK_CLOSED 3 /* socket state changed to closed */
260 #define CEPH_CON_F_BACKOFF 4 /* need to retry queuing delayed
263 /* ceph connection fault delay defaults, for exponential backoff */
264 #define BASE_DELAY_INTERVAL (HZ / 4)
265 #define MAX_DELAY_INTERVAL (15 * HZ)
268 * A single connection with another host.
270 * We maintain a queue of outgoing messages, and some session state to
271 * ensure that we can preserve the lossless, ordered delivery of
272 * messages in the case of a TCP disconnect.
274 struct ceph_connection
{
277 const struct ceph_connection_operations
*ops
;
279 struct ceph_messenger
*msgr
;
281 int state
; /* CEPH_CON_S_* */
284 struct ceph_entity_addr peer_addr
; /* peer address */
285 struct ceph_entity_addr peer_addr_for_me
;
287 unsigned long flags
; /* CEPH_CON_F_* */
288 const char *error_msg
; /* error message, if any */
290 struct ceph_entity_name peer_name
; /* peer name */
293 u32 connect_seq
; /* identify the most recent connection
294 attempt for this connection, client */
295 u32 peer_global_seq
; /* peer's global seq for this connection */
297 struct ceph_auth_handshake
*auth
;
298 int auth_retry
; /* true if we need a newer authorizer */
303 struct list_head out_queue
;
304 struct list_head out_sent
; /* sending or sent but unacked */
305 u64 out_seq
; /* last message queued for send */
307 u64 in_seq
, in_seq_acked
; /* last message received, acked */
309 /* connection negotiation temps */
310 char in_banner
[CEPH_BANNER_MAX_LEN
];
311 struct ceph_msg_connect out_connect
;
312 struct ceph_msg_connect_reply in_reply
;
313 struct ceph_entity_addr actual_peer_addr
;
315 /* message out temps */
316 struct ceph_msg_header out_hdr
;
317 struct ceph_msg
*out_msg
; /* sending message (== tail of
321 struct kvec out_kvec
[8], /* sending header/footer data */
323 int out_kvec_left
; /* kvec's left in out_kvec */
324 int out_skip
; /* skip this many bytes */
325 int out_kvec_bytes
; /* total bytes left */
326 int out_more
; /* there is more data after the kvecs */
327 __le64 out_temp_ack
; /* for writing an ack */
328 struct ceph_timespec out_temp_keepalive2
; /* for writing keepalive2
331 /* message in temps */
332 struct ceph_msg_header in_hdr
;
333 struct ceph_msg
*in_msg
;
334 u32 in_front_crc
, in_middle_crc
, in_data_crc
; /* calculated crc */
336 char in_tag
; /* protocol control byte */
337 int in_base_pos
; /* bytes read */
338 __le64 in_temp_ack
; /* for reading an ack */
340 struct timespec64 last_keepalive_ack
; /* keepalive2 ack stamp */
342 struct delayed_work work
; /* send|recv work */
343 unsigned long delay
; /* current delay interval */
347 extern const char *ceph_pr_addr(const struct ceph_entity_addr
*addr
);
349 extern int ceph_parse_ips(const char *c
, const char *end
,
350 struct ceph_entity_addr
*addr
,
351 int max_count
, int *count
);
354 extern int ceph_msgr_init(void);
355 extern void ceph_msgr_exit(void);
356 extern void ceph_msgr_flush(void);
358 extern void ceph_messenger_init(struct ceph_messenger
*msgr
,
359 struct ceph_entity_addr
*myaddr
);
360 extern void ceph_messenger_fini(struct ceph_messenger
*msgr
);
361 extern void ceph_messenger_reset_nonce(struct ceph_messenger
*msgr
);
363 extern void ceph_con_init(struct ceph_connection
*con
, void *private,
364 const struct ceph_connection_operations
*ops
,
365 struct ceph_messenger
*msgr
);
366 extern void ceph_con_open(struct ceph_connection
*con
,
367 __u8 entity_type
, __u64 entity_num
,
368 struct ceph_entity_addr
*addr
);
369 extern bool ceph_con_opened(struct ceph_connection
*con
);
370 extern void ceph_con_close(struct ceph_connection
*con
);
371 extern void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
);
373 extern void ceph_msg_revoke(struct ceph_msg
*msg
);
374 extern void ceph_msg_revoke_incoming(struct ceph_msg
*msg
);
376 extern void ceph_con_keepalive(struct ceph_connection
*con
);
377 extern bool ceph_con_keepalive_expired(struct ceph_connection
*con
,
378 unsigned long interval
);
380 void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
381 size_t length
, size_t alignment
, bool own_pages
);
382 extern void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
383 struct ceph_pagelist
*pagelist
);
385 void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct ceph_bio_iter
*bio_pos
,
387 #endif /* CONFIG_BLOCK */
388 void ceph_msg_data_add_bvecs(struct ceph_msg
*msg
,
389 struct ceph_bvec_iter
*bvec_pos
);
391 struct ceph_msg
*ceph_msg_new2(int type
, int front_len
, int max_data_items
,
392 gfp_t flags
, bool can_fail
);
393 extern struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
396 extern struct ceph_msg
*ceph_msg_get(struct ceph_msg
*msg
);
397 extern void ceph_msg_put(struct ceph_msg
*msg
);
399 extern void ceph_msg_dump(struct ceph_msg
*msg
);