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libceph: fix socket read error handling
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ceph / messenger.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
31b8006e
SW		 2
3#include <linux/crc32c.h>
4#include <linux/ctype.h>
5#include <linux/highmem.h>
6#include <linux/inet.h>
7#include <linux/kthread.h>
8#include <linux/net.h>
5a0e3ad6 9#include <linux/slab.h>
31b8006e
SW		 10#include <linux/socket.h>
11#include <linux/string.h>
68b4476b
YS		 12#include <linux/bio.h>
13#include <linux/blkdev.h>
31b8006e
SW		 14#include <net/tcp.h>
15
3d14c5d2
YS		 16#include <linux/ceph/libceph.h>
17#include <linux/ceph/messenger.h>
18#include <linux/ceph/decode.h>
19#include <linux/ceph/pagelist.h>
31b8006e
SW		 20
21/*
22 * Ceph uses the messenger to exchange ceph_msg messages with other
23 * hosts in the system. The messenger provides ordered and reliable
24 * delivery. We tolerate TCP disconnects by reconnecting (with
25 * exponential backoff) in the case of a fault (disconnection, bad
26 * crc, protocol error). Acks allow sent messages to be discarded by
27 * the sender.
28 */
29
30/* static tag bytes (protocol control messages) */
31static char tag_msg = CEPH_MSGR_TAG_MSG;
32static char tag_ack = CEPH_MSGR_TAG_ACK;
33static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
34
a6a5349d
SW		 35#ifdef CONFIG_LOCKDEP
36static struct lock_class_key socket_class;
37#endif
38
31b8006e
SW		 39
40static void queue_con(struct ceph_connection *con);
41static void con_work(struct work_struct *);
42static void ceph_fault(struct ceph_connection *con);
43
31b8006e
SW		 44/*
45 * nicely render a sockaddr as a string.
46 */
47#define MAX_ADDR_STR 20
d06dbaf6
SW		 48#define MAX_ADDR_STR_LEN 60
49static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
31b8006e
SW		 50static DEFINE_SPINLOCK(addr_str_lock);
51static int last_addr_str;
52
3d14c5d2 53const char *ceph_pr_addr(const struct sockaddr_storage *ss)
31b8006e
SW		 54{
55 int i;
56 char *s;
57 struct sockaddr_in *in4 = (void *)ss;
31b8006e
SW		 58 struct sockaddr_in6 *in6 = (void *)ss;
59
60 spin_lock(&addr_str_lock);
61 i = last_addr_str++;
62 if (last_addr_str == MAX_ADDR_STR)
63 last_addr_str = 0;
64 spin_unlock(&addr_str_lock);
65 s = addr_str[i];
66
67 switch (ss->ss_family) {
68 case AF_INET:
d06dbaf6
SW		 69 snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
70 (unsigned int)ntohs(in4->sin_port));
31b8006e
SW		 71 break;
72
73 case AF_INET6:
d06dbaf6
SW		 74 snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
75 (unsigned int)ntohs(in6->sin6_port));
31b8006e
SW		 76 break;
77
78 default:
79 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
80 }
81
82 return s;
83}
3d14c5d2 84EXPORT_SYMBOL(ceph_pr_addr);
31b8006e 85
63f2d211
SW		 86static void encode_my_addr(struct ceph_messenger *msgr)
87{
88 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
89 ceph_encode_addr(&msgr->my_enc_addr);
90}
91
31b8006e
SW		 92/*
93 * work queue for all reading and writing to/from the socket.
94 */
95struct workqueue_struct *ceph_msgr_wq;
96
3d14c5d2 97int ceph_msgr_init(void)
31b8006e 98{
f363e45f 99 ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
d96c9043
SW		 100 if (!ceph_msgr_wq) {
101 pr_err("msgr_init failed to create workqueue\n");
102 return -ENOMEM;
31b8006e
SW		 103 }
104 return 0;
105}
3d14c5d2 106EXPORT_SYMBOL(ceph_msgr_init);
31b8006e
SW		 107
108void ceph_msgr_exit(void)
109{
110 destroy_workqueue(ceph_msgr_wq);
111}
3d14c5d2 112EXPORT_SYMBOL(ceph_msgr_exit);
31b8006e 113
cd84db6e 114void ceph_msgr_flush(void)
a922d38f
SW		 115{
116 flush_workqueue(ceph_msgr_wq);
117}
3d14c5d2 118EXPORT_SYMBOL(ceph_msgr_flush);
a922d38f
SW		 119
120
31b8006e
SW		 121/*
122 * socket callback functions
123 */
124
125/* data available on socket, or listen socket received a connect */
126static void ceph_data_ready(struct sock *sk, int count_unused)
127{
128 struct ceph_connection *con =
129 (struct ceph_connection *)sk->sk_user_data;
130 if (sk->sk_state != TCP_CLOSE_WAIT) {
131 dout("ceph_data_ready on %p state = %lu, queueing work\n",
132 con, con->state);
133 queue_con(con);
134 }
135}
136
137/* socket has buffer space for writing */
138static void ceph_write_space(struct sock *sk)
139{
140 struct ceph_connection *con =
141 (struct ceph_connection *)sk->sk_user_data;
142
143 /* only queue to workqueue if there is data we want to write. */
144 if (test_bit(WRITE_PENDING, &con->state)) {
145 dout("ceph_write_space %p queueing write work\n", con);
146 queue_con(con);
147 } else {
148 dout("ceph_write_space %p nothing to write\n", con);
149 }
150
151 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
152 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
153}
154
155/* socket's state has changed */
156static void ceph_state_change(struct sock *sk)
157{
158 struct ceph_connection *con =
159 (struct ceph_connection *)sk->sk_user_data;
160
161 dout("ceph_state_change %p state = %lu sk_state = %u\n",
162 con, con->state, sk->sk_state);
163
164 if (test_bit(CLOSED, &con->state))
165 return;
166
167 switch (sk->sk_state) {
168 case TCP_CLOSE:
169 dout("ceph_state_change TCP_CLOSE\n");
170 case TCP_CLOSE_WAIT:
171 dout("ceph_state_change TCP_CLOSE_WAIT\n");
172 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
173 if (test_bit(CONNECTING, &con->state))
174 con->error_msg = "connection failed";
175 else
176 con->error_msg = "socket closed";
177 queue_con(con);
178 }
179 break;
180 case TCP_ESTABLISHED:
181 dout("ceph_state_change TCP_ESTABLISHED\n");
182 queue_con(con);
183 break;
184 }
185}
186
187/*
188 * set up socket callbacks
189 */
190static void set_sock_callbacks(struct socket *sock,
191 struct ceph_connection *con)
192{
193 struct sock *sk = sock->sk;
194 sk->sk_user_data = (void *)con;
195 sk->sk_data_ready = ceph_data_ready;
196 sk->sk_write_space = ceph_write_space;
197 sk->sk_state_change = ceph_state_change;
198}
199
200
201/*
202 * socket helpers
203 */
204
205/*
206 * initiate connection to a remote socket.
207 */
208static struct socket *ceph_tcp_connect(struct ceph_connection *con)
209{
f91d3471 210 struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
31b8006e
SW		 211 struct socket *sock;
212 int ret;
213
214 BUG_ON(con->sock);
f91d3471
SW		 215 ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
216 IPPROTO_TCP, &sock);
31b8006e
SW		 217 if (ret)
218 return ERR_PTR(ret);
219 con->sock = sock;
220 sock->sk->sk_allocation = GFP_NOFS;
221
a6a5349d
SW		 222#ifdef CONFIG_LOCKDEP
223 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
224#endif
225
31b8006e
SW		 226 set_sock_callbacks(sock, con);
227
3d14c5d2 228 dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 229
f91d3471
SW		 230 ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
231 O_NONBLOCK);
31b8006e
SW		 232 if (ret == -EINPROGRESS) {
233 dout("connect %s EINPROGRESS sk_state = %u\n",
3d14c5d2 234 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e
SW		 235 sock->sk->sk_state);
236 ret = 0;
237 }
238 if (ret < 0) {
239 pr_err("connect %s error %d\n",
3d14c5d2 240 ceph_pr_addr(&con->peer_addr.in_addr), ret);
31b8006e
SW		 241 sock_release(sock);
242 con->sock = NULL;
243 con->error_msg = "connect error";
244 }
245
246 if (ret < 0)
247 return ERR_PTR(ret);
248 return sock;
249}
250
251static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
252{
253 struct kvec iov = {buf, len};
254 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
98bdb0aa 255 int r;
31b8006e 256
98bdb0aa
SW		 257 r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
258 if (r == -EAGAIN)
259 r = 0;
260 return r;
31b8006e
SW		 261}
262
263/*
264 * write something. @more is true if caller will be sending more data
265 * shortly.
266 */
267static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
268 size_t kvlen, size_t len, int more)
269{
270 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
271
272 if (more)
273 msg.msg_flags |= MSG_MORE;
274 else
275 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
276
277 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
278}
279
280
281/*
282 * Shutdown/close the socket for the given connection.
283 */
284static int con_close_socket(struct ceph_connection *con)
285{
286 int rc;
287
288 dout("con_close_socket on %p sock %p\n", con, con->sock);
289 if (!con->sock)
290 return 0;
291 set_bit(SOCK_CLOSED, &con->state);
292 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
293 sock_release(con->sock);
294 con->sock = NULL;
295 clear_bit(SOCK_CLOSED, &con->state);
296 return rc;
297}
298
299/*
300 * Reset a connection. Discard all incoming and outgoing messages
301 * and clear *_seq state.
302 */
303static void ceph_msg_remove(struct ceph_msg *msg)
304{
305 list_del_init(&msg->list_head);
306 ceph_msg_put(msg);
307}
308static void ceph_msg_remove_list(struct list_head *head)
309{
310 while (!list_empty(head)) {
311 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
312 list_head);
313 ceph_msg_remove(msg);
314 }
315}
316
317static void reset_connection(struct ceph_connection *con)
318{
319 /* reset connection, out_queue, msg_ and connect_seq */
320 /* discard existing out_queue and msg_seq */
31b8006e
SW		 321 ceph_msg_remove_list(&con->out_queue);
322 ceph_msg_remove_list(&con->out_sent);
323
cf3e5c40
SW		 324 if (con->in_msg) {
325 ceph_msg_put(con->in_msg);
326 con->in_msg = NULL;
327 }
328
31b8006e
SW		 329 con->connect_seq = 0;
330 con->out_seq = 0;
c86a2930
SW		 331 if (con->out_msg) {
332 ceph_msg_put(con->out_msg);
333 con->out_msg = NULL;
334 }
6f2bc3ff 335 con->out_keepalive_pending = false;
31b8006e 336 con->in_seq = 0;
0e0d5e0c 337 con->in_seq_acked = 0;
31b8006e
SW		 338}
339
340/*
341 * mark a peer down. drop any open connections.
342 */
343void ceph_con_close(struct ceph_connection *con)
344{
3d14c5d2
YS		 345 dout("con_close %p peer %s\n", con,
346 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 347 set_bit(CLOSED, &con->state); /* in case there's queued work */
348 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
1679f876
SW		 349 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
350 clear_bit(KEEPALIVE_PENDING, &con->state);
351 clear_bit(WRITE_PENDING, &con->state);
ec302645 352 mutex_lock(&con->mutex);
31b8006e 353 reset_connection(con);
6f2bc3ff 354 con->peer_global_seq = 0;
91e45ce3 355 cancel_delayed_work(&con->work);
ec302645 356 mutex_unlock(&con->mutex);
31b8006e
SW		 357 queue_con(con);
358}
3d14c5d2 359EXPORT_SYMBOL(ceph_con_close);
31b8006e 360
31b8006e
SW		 361/*
362 * Reopen a closed connection, with a new peer address.
363 */
364void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
365{
3d14c5d2 366 dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
31b8006e
SW		 367 set_bit(OPENING, &con->state);
368 clear_bit(CLOSED, &con->state);
369 memcpy(&con->peer_addr, addr, sizeof(*addr));
03c677e1 370 con->delay = 0; /* reset backoff memory */
31b8006e
SW		 371 queue_con(con);
372}
3d14c5d2 373EXPORT_SYMBOL(ceph_con_open);
31b8006e 374
87b315a5
SW		 375/*
376 * return true if this connection ever successfully opened
377 */
378bool ceph_con_opened(struct ceph_connection *con)
379{
380 return con->connect_seq > 0;
381}
382
31b8006e
SW		 383/*
384 * generic get/put
385 */
386struct ceph_connection *ceph_con_get(struct ceph_connection *con)
387{
388 dout("con_get %p nref = %d -> %d\n", con,
389 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
390 if (atomic_inc_not_zero(&con->nref))
391 return con;
392 return NULL;
393}
394
395void ceph_con_put(struct ceph_connection *con)
396{
397 dout("con_put %p nref = %d -> %d\n", con,
398 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
399 BUG_ON(atomic_read(&con->nref) == 0);
400 if (atomic_dec_and_test(&con->nref)) {
71ececda 401 BUG_ON(con->sock);
31b8006e
SW		 402 kfree(con);
403 }
404}
405
406/*
407 * initialize a new connection.
408 */
409void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
410{
411 dout("con_init %p\n", con);
412 memset(con, 0, sizeof(*con));
413 atomic_set(&con->nref, 1);
414 con->msgr = msgr;
ec302645 415 mutex_init(&con->mutex);
31b8006e
SW		 416 INIT_LIST_HEAD(&con->out_queue);
417 INIT_LIST_HEAD(&con->out_sent);
418 INIT_DELAYED_WORK(&con->work, con_work);
419}
3d14c5d2 420EXPORT_SYMBOL(ceph_con_init);
31b8006e
SW		 421
422
423/*
424 * We maintain a global counter to order connection attempts. Get
425 * a unique seq greater than @gt.
426 */
427static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
428{
429 u32 ret;
430
431 spin_lock(&msgr->global_seq_lock);
432 if (msgr->global_seq < gt)
433 msgr->global_seq = gt;
434 ret = ++msgr->global_seq;
435 spin_unlock(&msgr->global_seq_lock);
436 return ret;
437}
438
439
440/*
441 * Prepare footer for currently outgoing message, and finish things
442 * off. Assumes out_kvec* are already valid.. we just add on to the end.
443 */
444static void prepare_write_message_footer(struct ceph_connection *con, int v)
445{
446 struct ceph_msg *m = con->out_msg;
447
448 dout("prepare_write_message_footer %p\n", con);
449 con->out_kvec_is_msg = true;
450 con->out_kvec[v].iov_base = &m->footer;
451 con->out_kvec[v].iov_len = sizeof(m->footer);
452 con->out_kvec_bytes += sizeof(m->footer);
453 con->out_kvec_left++;
454 con->out_more = m->more_to_follow;
c86a2930 455 con->out_msg_done = true;
31b8006e
SW		 456}
457
458/*
459 * Prepare headers for the next outgoing message.
460 */
461static void prepare_write_message(struct ceph_connection *con)
462{
463 struct ceph_msg *m;
464 int v = 0;
465
466 con->out_kvec_bytes = 0;
467 con->out_kvec_is_msg = true;
c86a2930 468 con->out_msg_done = false;
31b8006e
SW		 469
470 /* Sneak an ack in there first? If we can get it into the same
471 * TCP packet that's a good thing. */
472 if (con->in_seq > con->in_seq_acked) {
473 con->in_seq_acked = con->in_seq;
474 con->out_kvec[v].iov_base = &tag_ack;
475 con->out_kvec[v++].iov_len = 1;
476 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
477 con->out_kvec[v].iov_base = &con->out_temp_ack;
478 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
479 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
480 }
481
31b8006e
SW		 482 m = list_first_entry(&con->out_queue,
483 struct ceph_msg, list_head);
c86a2930 484 con->out_msg = m;
b3d1dbbd 485 if (test_bit(LOSSYTX, &con->state)) {
6c5d1a49
SW		 486 list_del_init(&m->list_head);
487 } else {
b3d1dbbd
SW		 488 /* put message on sent list */
489 ceph_msg_get(m);
490 list_move_tail(&m->list_head, &con->out_sent);
b3d1dbbd 491 }
31b8006e 492
e84346b7
SW		 493 /*
494 * only assign outgoing seq # if we haven't sent this message
495 * yet. if it is requeued, resend with it's original seq.
496 */
497 if (m->needs_out_seq) {
498 m->hdr.seq = cpu_to_le64(++con->out_seq);
499 m->needs_out_seq = false;
500 }
31b8006e
SW		 501
502 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
503 m, con->out_seq, le16_to_cpu(m->hdr.type),
504 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
505 le32_to_cpu(m->hdr.data_len),
506 m->nr_pages);
507 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
508
509 /* tag + hdr + front + middle */
510 con->out_kvec[v].iov_base = &tag_msg;
511 con->out_kvec[v++].iov_len = 1;
512 con->out_kvec[v].iov_base = &m->hdr;
513 con->out_kvec[v++].iov_len = sizeof(m->hdr);
514 con->out_kvec[v++] = m->front;
515 if (m->middle)
516 con->out_kvec[v++] = m->middle->vec;
517 con->out_kvec_left = v;
518 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
519 (m->middle ? m->middle->vec.iov_len : 0);
520 con->out_kvec_cur = con->out_kvec;
521
522 /* fill in crc (except data pages), footer */
523 con->out_msg->hdr.crc =
524 cpu_to_le32(crc32c(0, (void *)&m->hdr,
525 sizeof(m->hdr) - sizeof(m->hdr.crc)));
526 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
527 con->out_msg->footer.front_crc =
528 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
529 if (m->middle)
530 con->out_msg->footer.middle_crc =
531 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
532 m->middle->vec.iov_len));
533 else
534 con->out_msg->footer.middle_crc = 0;
535 con->out_msg->footer.data_crc = 0;
536 dout("prepare_write_message front_crc %u data_crc %u\n",
537 le32_to_cpu(con->out_msg->footer.front_crc),
538 le32_to_cpu(con->out_msg->footer.middle_crc));
539
540 /* is there a data payload? */
541 if (le32_to_cpu(m->hdr.data_len) > 0) {
542 /* initialize page iterator */
543 con->out_msg_pos.page = 0;
68b4476b 544 if (m->pages)
c5c6b19d 545 con->out_msg_pos.page_pos = m->page_alignment;
68b4476b
YS		 546 else
547 con->out_msg_pos.page_pos = 0;
31b8006e
SW		 548 con->out_msg_pos.data_pos = 0;
549 con->out_msg_pos.did_page_crc = 0;
550 con->out_more = 1; /* data + footer will follow */
551 } else {
552 /* no, queue up footer too and be done */
553 prepare_write_message_footer(con, v);
554 }
555
556 set_bit(WRITE_PENDING, &con->state);
557}
558
559/*
560 * Prepare an ack.
561 */
562static void prepare_write_ack(struct ceph_connection *con)
563{
564 dout("prepare_write_ack %p %llu -> %llu\n", con,
565 con->in_seq_acked, con->in_seq);
566 con->in_seq_acked = con->in_seq;
567
568 con->out_kvec[0].iov_base = &tag_ack;
569 con->out_kvec[0].iov_len = 1;
570 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
571 con->out_kvec[1].iov_base = &con->out_temp_ack;
572 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
573 con->out_kvec_left = 2;
574 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
575 con->out_kvec_cur = con->out_kvec;
576 con->out_more = 1; /* more will follow.. eventually.. */
577 set_bit(WRITE_PENDING, &con->state);
578}
579
580/*
581 * Prepare to write keepalive byte.
582 */
583static void prepare_write_keepalive(struct ceph_connection *con)
584{
585 dout("prepare_write_keepalive %p\n", con);
586 con->out_kvec[0].iov_base = &tag_keepalive;
587 con->out_kvec[0].iov_len = 1;
588 con->out_kvec_left = 1;
589 con->out_kvec_bytes = 1;
590 con->out_kvec_cur = con->out_kvec;
591 set_bit(WRITE_PENDING, &con->state);
592}
593
594/*
595 * Connection negotiation.
596 */
597
4e7a5dcd
SW		 598static void prepare_connect_authorizer(struct ceph_connection *con)
599{
600 void *auth_buf;
601 int auth_len = 0;
602 int auth_protocol = 0;
603
ec302645 604 mutex_unlock(&con->mutex);
4e7a5dcd
SW		 605 if (con->ops->get_authorizer)
606 con->ops->get_authorizer(con, &auth_buf, &auth_len,
607 &auth_protocol, &con->auth_reply_buf,
608 &con->auth_reply_buf_len,
609 con->auth_retry);
ec302645 610 mutex_lock(&con->mutex);
4e7a5dcd
SW		 611
612 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
613 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
614
615 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
616 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
617 con->out_kvec_left++;
618 con->out_kvec_bytes += auth_len;
619}
620
31b8006e
SW		 621/*
622 * We connected to a peer and are saying hello.
623 */
eed0ef2c
SW		 624static void prepare_write_banner(struct ceph_messenger *msgr,
625 struct ceph_connection *con)
31b8006e
SW		 626{
627 int len = strlen(CEPH_BANNER);
eed0ef2c
SW		 628
629 con->out_kvec[0].iov_base = CEPH_BANNER;
630 con->out_kvec[0].iov_len = len;
631 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
632 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
633 con->out_kvec_left = 2;
634 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
635 con->out_kvec_cur = con->out_kvec;
636 con->out_more = 0;
637 set_bit(WRITE_PENDING, &con->state);
638}
639
640static void prepare_write_connect(struct ceph_messenger *msgr,
641 struct ceph_connection *con,
642 int after_banner)
643{
31b8006e
SW		 644 unsigned global_seq = get_global_seq(con->msgr, 0);
645 int proto;
646
647 switch (con->peer_name.type) {
648 case CEPH_ENTITY_TYPE_MON:
649 proto = CEPH_MONC_PROTOCOL;
650 break;
651 case CEPH_ENTITY_TYPE_OSD:
652 proto = CEPH_OSDC_PROTOCOL;
653 break;
654 case CEPH_ENTITY_TYPE_MDS:
655 proto = CEPH_MDSC_PROTOCOL;
656 break;
657 default:
658 BUG();
659 }
660
661 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
662 con->connect_seq, global_seq, proto);
4e7a5dcd 663
3d14c5d2 664 con->out_connect.features = cpu_to_le64(msgr->supported_features);
31b8006e
SW		 665 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
666 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
667 con->out_connect.global_seq = cpu_to_le32(global_seq);
668 con->out_connect.protocol_version = cpu_to_le32(proto);
669 con->out_connect.flags = 0;
31b8006e 670
eed0ef2c
SW		 671 if (!after_banner) {
672 con->out_kvec_left = 0;
673 con->out_kvec_bytes = 0;
674 }
675 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
676 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
677 con->out_kvec_left++;
678 con->out_kvec_bytes += sizeof(con->out_connect);
31b8006e
SW		 679 con->out_kvec_cur = con->out_kvec;
680 con->out_more = 0;
681 set_bit(WRITE_PENDING, &con->state);
4e7a5dcd
SW		 682
683 prepare_connect_authorizer(con);
31b8006e
SW		 684}
685
686
687/*
688 * write as much of pending kvecs to the socket as we can.
689 * 1 -> done
690 * 0 -> socket full, but more to do
691 * <0 -> error
692 */
693static int write_partial_kvec(struct ceph_connection *con)
694{
695 int ret;
696
697 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
698 while (con->out_kvec_bytes > 0) {
699 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
700 con->out_kvec_left, con->out_kvec_bytes,
701 con->out_more);
702 if (ret <= 0)
703 goto out;
704 con->out_kvec_bytes -= ret;
705 if (con->out_kvec_bytes == 0)
706 break; /* done */
707 while (ret > 0) {
708 if (ret >= con->out_kvec_cur->iov_len) {
709 ret -= con->out_kvec_cur->iov_len;
710 con->out_kvec_cur++;
711 con->out_kvec_left--;
712 } else {
713 con->out_kvec_cur->iov_len -= ret;
714 con->out_kvec_cur->iov_base += ret;
715 ret = 0;
716 break;
717 }
718 }
719 }
720 con->out_kvec_left = 0;
721 con->out_kvec_is_msg = false;
722 ret = 1;
723out:
724 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
725 con->out_kvec_bytes, con->out_kvec_left, ret);
726 return ret; /* done! */
727}
728
68b4476b
YS		 729#ifdef CONFIG_BLOCK
730static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
731{
732 if (!bio) {
733 *iter = NULL;
734 *seg = 0;
735 return;
736 }
737 *iter = bio;
738 *seg = bio->bi_idx;
739}
740
741static void iter_bio_next(struct bio **bio_iter, int *seg)
742{
743 if (*bio_iter == NULL)
744 return;
745
746 BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
747
748 (*seg)++;
749 if (*seg == (*bio_iter)->bi_vcnt)
750 init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
751}
752#endif
753
31b8006e
SW		 754/*
755 * Write as much message data payload as we can. If we finish, queue
756 * up the footer.
757 * 1 -> done, footer is now queued in out_kvec[].
758 * 0 -> socket full, but more to do
759 * <0 -> error
760 */
761static int write_partial_msg_pages(struct ceph_connection *con)
762{
763 struct ceph_msg *msg = con->out_msg;
764 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
765 size_t len;
766 int crc = con->msgr->nocrc;
767 int ret;
68b4476b
YS		 768 int total_max_write;
769 int in_trail = 0;
770 size_t trail_len = (msg->trail ? msg->trail->length : 0);
31b8006e
SW		 771
772 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
773 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
774 con->out_msg_pos.page_pos);
775
68b4476b
YS		 776#ifdef CONFIG_BLOCK
777 if (msg->bio && !msg->bio_iter)
778 init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
779#endif
780
781 while (data_len > con->out_msg_pos.data_pos) {
31b8006e
SW		 782 struct page *page = NULL;
783 void *kaddr = NULL;
68b4476b
YS		 784 int max_write = PAGE_SIZE;
785 int page_shift = 0;
786
787 total_max_write = data_len - trail_len -
788 con->out_msg_pos.data_pos;
31b8006e
SW		 789
790 /*
791 * if we are calculating the data crc (the default), we need
792 * to map the page. if our pages[] has been revoked, use the
793 * zero page.
794 */
68b4476b
YS		 795
796 /* have we reached the trail part of the data? */
797 if (con->out_msg_pos.data_pos >= data_len - trail_len) {
798 in_trail = 1;
799
800 total_max_write = data_len - con->out_msg_pos.data_pos;
801
802 page = list_first_entry(&msg->trail->head,
803 struct page, lru);
804 if (crc)
805 kaddr = kmap(page);
806 max_write = PAGE_SIZE;
807 } else if (msg->pages) {
31b8006e
SW		 808 page = msg->pages[con->out_msg_pos.page];
809 if (crc)
810 kaddr = kmap(page);
58bb3b37
SW		 811 } else if (msg->pagelist) {
812 page = list_first_entry(&msg->pagelist->head,
813 struct page, lru);
814 if (crc)
815 kaddr = kmap(page);
68b4476b
YS		 816#ifdef CONFIG_BLOCK
817 } else if (msg->bio) {
818 struct bio_vec *bv;
819
820 bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
821 page = bv->bv_page;
822 page_shift = bv->bv_offset;
823 if (crc)
824 kaddr = kmap(page) + page_shift;
825 max_write = bv->bv_len;
826#endif
31b8006e
SW		 827 } else {
828 page = con->msgr->zero_page;
829 if (crc)
830 kaddr = page_address(con->msgr->zero_page);
831 }
68b4476b
YS		 832 len = min_t(int, max_write - con->out_msg_pos.page_pos,
833 total_max_write);
834
31b8006e
SW		 835 if (crc && !con->out_msg_pos.did_page_crc) {
836 void *base = kaddr + con->out_msg_pos.page_pos;
837 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
838
839 BUG_ON(kaddr == NULL);
840 con->out_msg->footer.data_crc =
841 cpu_to_le32(crc32c(tmpcrc, base, len));
842 con->out_msg_pos.did_page_crc = 1;
843 }
31b8006e 844 ret = kernel_sendpage(con->sock, page,
68b4476b
YS		 845 con->out_msg_pos.page_pos + page_shift,
846 len,
31b8006e
SW		 847 MSG_DONTWAIT | MSG_NOSIGNAL |
848 MSG_MORE);
849
68b4476b
YS		 850 if (crc &&
851 (msg->pages || msg->pagelist || msg->bio || in_trail))
31b8006e
SW		 852 kunmap(page);
853
854 if (ret <= 0)
855 goto out;
856
857 con->out_msg_pos.data_pos += ret;
858 con->out_msg_pos.page_pos += ret;
859 if (ret == len) {
860 con->out_msg_pos.page_pos = 0;
861 con->out_msg_pos.page++;
862 con->out_msg_pos.did_page_crc = 0;
68b4476b
YS		 863 if (in_trail)
864 list_move_tail(&page->lru,
865 &msg->trail->head);
866 else if (msg->pagelist)
58bb3b37
SW		 867 list_move_tail(&page->lru,
868 &msg->pagelist->head);
68b4476b
YS		 869#ifdef CONFIG_BLOCK
870 else if (msg->bio)
871 iter_bio_next(&msg->bio_iter, &msg->bio_seg);
872#endif
31b8006e
SW		 873 }
874 }
875
876 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
877
878 /* prepare and queue up footer, too */
879 if (!crc)
880 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
881 con->out_kvec_bytes = 0;
882 con->out_kvec_left = 0;
883 con->out_kvec_cur = con->out_kvec;
884 prepare_write_message_footer(con, 0);
885 ret = 1;
886out:
887 return ret;
888}
889
890/*
891 * write some zeros
892 */
893static int write_partial_skip(struct ceph_connection *con)
894{
895 int ret;
896
897 while (con->out_skip > 0) {
898 struct kvec iov = {
899 .iov_base = page_address(con->msgr->zero_page),
900 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
901 };
902
903 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
904 if (ret <= 0)
905 goto out;
906 con->out_skip -= ret;
907 }
908 ret = 1;
909out:
910 return ret;
911}
912
913/*
914 * Prepare to read connection handshake, or an ack.
915 */
eed0ef2c
SW		 916static void prepare_read_banner(struct ceph_connection *con)
917{
918 dout("prepare_read_banner %p\n", con);
919 con->in_base_pos = 0;
920}
921
31b8006e
SW		 922static void prepare_read_connect(struct ceph_connection *con)
923{
924 dout("prepare_read_connect %p\n", con);
925 con->in_base_pos = 0;
926}
927
928static void prepare_read_ack(struct ceph_connection *con)
929{
930 dout("prepare_read_ack %p\n", con);
931 con->in_base_pos = 0;
932}
933
934static void prepare_read_tag(struct ceph_connection *con)
935{
936 dout("prepare_read_tag %p\n", con);
937 con->in_base_pos = 0;
938 con->in_tag = CEPH_MSGR_TAG_READY;
939}
940
941/*
942 * Prepare to read a message.
943 */
944static int prepare_read_message(struct ceph_connection *con)
945{
946 dout("prepare_read_message %p\n", con);
947 BUG_ON(con->in_msg != NULL);
948 con->in_base_pos = 0;
949 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
950 return 0;
951}
952
953
954static int read_partial(struct ceph_connection *con,
955 int *to, int size, void *object)
956{
957 *to += size;
958 while (con->in_base_pos < *to) {
959 int left = *to - con->in_base_pos;
960 int have = size - left;
961 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
962 if (ret <= 0)
963 return ret;
964 con->in_base_pos += ret;
965 }
966 return 1;
967}
968
969
970/*
971 * Read all or part of the connect-side handshake on a new connection
972 */
eed0ef2c 973static int read_partial_banner(struct ceph_connection *con)
31b8006e
SW		 974{
975 int ret, to = 0;
976
eed0ef2c 977 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
31b8006e
SW		 978
979 /* peer's banner */
980 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
981 if (ret <= 0)
982 goto out;
983 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
984 &con->actual_peer_addr);
985 if (ret <= 0)
986 goto out;
987 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
988 &con->peer_addr_for_me);
989 if (ret <= 0)
990 goto out;
eed0ef2c
SW		 991out:
992 return ret;
993}
994
995static int read_partial_connect(struct ceph_connection *con)
996{
997 int ret, to = 0;
998
999 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
1000
31b8006e
SW		 1001 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
1002 if (ret <= 0)
1003 goto out;
4e7a5dcd
SW		 1004 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
1005 con->auth_reply_buf);
1006 if (ret <= 0)
1007 goto out;
31b8006e 1008
4e7a5dcd
SW		 1009 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
1010 con, (int)con->in_reply.tag,
1011 le32_to_cpu(con->in_reply.connect_seq),
31b8006e
SW		 1012 le32_to_cpu(con->in_reply.global_seq));
1013out:
1014 return ret;
eed0ef2c 1015
31b8006e
SW		 1016}
1017
1018/*
1019 * Verify the hello banner looks okay.
1020 */
1021static int verify_hello(struct ceph_connection *con)
1022{
1023 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
13e38c8a 1024 pr_err("connect to %s got bad banner\n",
3d14c5d2 1025 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 1026 con->error_msg = "protocol error, bad banner";
1027 return -1;
1028 }
1029 return 0;
1030}
1031
1032static bool addr_is_blank(struct sockaddr_storage *ss)
1033{
1034 switch (ss->ss_family) {
1035 case AF_INET:
1036 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
1037 case AF_INET6:
1038 return
1039 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
1040 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
1041 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
1042 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
1043 }
1044 return false;
1045}
1046
1047static int addr_port(struct sockaddr_storage *ss)
1048{
1049 switch (ss->ss_family) {
1050 case AF_INET:
f28bcfbe 1051 return ntohs(((struct sockaddr_in *)ss)->sin_port);
31b8006e 1052 case AF_INET6:
f28bcfbe 1053 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
31b8006e
SW		 1054 }
1055 return 0;
1056}
1057
1058static void addr_set_port(struct sockaddr_storage *ss, int p)
1059{
1060 switch (ss->ss_family) {
1061 case AF_INET:
1062 ((struct sockaddr_in *)ss)->sin_port = htons(p);
1063 case AF_INET6:
1064 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
1065 }
1066}
1067
1068/*
1069 * Parse an ip[:port] list into an addr array. Use the default
1070 * monitor port if a port isn't specified.
1071 */
1072int ceph_parse_ips(const char *c, const char *end,
1073 struct ceph_entity_addr *addr,
1074 int max_count, int *count)
1075{
1076 int i;
1077 const char *p = c;
1078
1079 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1080 for (i = 0; i < max_count; i++) {
1081 const char *ipend;
1082 struct sockaddr_storage *ss = &addr[i].in_addr;
1083 struct sockaddr_in *in4 = (void *)ss;
1084 struct sockaddr_in6 *in6 = (void *)ss;
1085 int port;
39139f64
SW		 1086 char delim = ',';
1087
1088 if (*p == '[') {
1089 delim = ']';
1090 p++;
1091 }
31b8006e
SW		 1092
1093 memset(ss, 0, sizeof(*ss));
1094 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
39139f64 1095 delim, &ipend))
31b8006e 1096 ss->ss_family = AF_INET;
39139f64
SW		 1097 else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1098 delim, &ipend))
31b8006e 1099 ss->ss_family = AF_INET6;
39139f64 1100 else
31b8006e 1101 goto bad;
31b8006e
SW		 1102 p = ipend;
1103
39139f64
SW		 1104 if (delim == ']') {
1105 if (*p != ']') {
1106 dout("missing matching ']'\n");
1107 goto bad;
1108 }
1109 p++;
1110 }
1111
31b8006e
SW		 1112 /* port? */
1113 if (p < end && *p == ':') {
1114 port = 0;
1115 p++;
1116 while (p < end && *p >= '0' && *p <= '9') {
1117 port = (port * 10) + (*p - '0');
1118 p++;
1119 }
1120 if (port > 65535 || port == 0)
1121 goto bad;
1122 } else {
1123 port = CEPH_MON_PORT;
1124 }
1125
1126 addr_set_port(ss, port);
1127
3d14c5d2 1128 dout("parse_ips got %s\n", ceph_pr_addr(ss));
31b8006e
SW		 1129
1130 if (p == end)
1131 break;
1132 if (*p != ',')
1133 goto bad;
1134 p++;
1135 }
1136
1137 if (p != end)
1138 goto bad;
1139
1140 if (count)
1141 *count = i + 1;
1142 return 0;
1143
1144bad:
39139f64 1145 pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
31b8006e
SW		 1146 return -EINVAL;
1147}
3d14c5d2 1148EXPORT_SYMBOL(ceph_parse_ips);
31b8006e 1149
eed0ef2c 1150static int process_banner(struct ceph_connection *con)
31b8006e 1151{
eed0ef2c 1152 dout("process_banner on %p\n", con);
31b8006e
SW		 1153
1154 if (verify_hello(con) < 0)
1155 return -1;
1156
63f2d211
SW		 1157 ceph_decode_addr(&con->actual_peer_addr);
1158 ceph_decode_addr(&con->peer_addr_for_me);
1159
31b8006e
SW		 1160 /*
1161 * Make sure the other end is who we wanted. note that the other
1162 * end may not yet know their ip address, so if it's 0.0.0.0, give
1163 * them the benefit of the doubt.
1164 */
103e2d3a
SW		 1165 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1166 sizeof(con->peer_addr)) != 0 &&
31b8006e
SW		 1167 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1168 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
cd84db6e 1169 pr_warning("wrong peer, want %s/%d, got %s/%d\n",
3d14c5d2 1170 ceph_pr_addr(&con->peer_addr.in_addr),
cd84db6e 1171 (int)le32_to_cpu(con->peer_addr.nonce),
3d14c5d2 1172 ceph_pr_addr(&con->actual_peer_addr.in_addr),
cd84db6e 1173 (int)le32_to_cpu(con->actual_peer_addr.nonce));
58bb3b37 1174 con->error_msg = "wrong peer at address";
31b8006e
SW		 1175 return -1;
1176 }
1177
1178 /*
1179 * did we learn our address?
1180 */
1181 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1182 int port = addr_port(&con->msgr->inst.addr.in_addr);
1183
1184 memcpy(&con->msgr->inst.addr.in_addr,
1185 &con->peer_addr_for_me.in_addr,
1186 sizeof(con->peer_addr_for_me.in_addr));
1187 addr_set_port(&con->msgr->inst.addr.in_addr, port);
63f2d211 1188 encode_my_addr(con->msgr);
eed0ef2c 1189 dout("process_banner learned my addr is %s\n",
3d14c5d2 1190 ceph_pr_addr(&con->msgr->inst.addr.in_addr));
31b8006e
SW		 1191 }
1192
eed0ef2c
SW		 1193 set_bit(NEGOTIATING, &con->state);
1194 prepare_read_connect(con);
1195 return 0;
1196}
1197
04a419f9
SW		 1198static void fail_protocol(struct ceph_connection *con)
1199{
1200 reset_connection(con);
1201 set_bit(CLOSED, &con->state); /* in case there's queued work */
1202
1203 mutex_unlock(&con->mutex);
1204 if (con->ops->bad_proto)
1205 con->ops->bad_proto(con);
1206 mutex_lock(&con->mutex);
1207}
1208
eed0ef2c
SW		 1209static int process_connect(struct ceph_connection *con)
1210{
3d14c5d2
YS		 1211 u64 sup_feat = con->msgr->supported_features;
1212 u64 req_feat = con->msgr->required_features;
04a419f9
SW		 1213 u64 server_feat = le64_to_cpu(con->in_reply.features);
1214
eed0ef2c
SW		 1215 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1216
31b8006e 1217 switch (con->in_reply.tag) {
04a419f9
SW		 1218 case CEPH_MSGR_TAG_FEATURES:
1219 pr_err("%s%lld %s feature set mismatch,"
1220 " my %llx < server's %llx, missing %llx\n",
1221 ENTITY_NAME(con->peer_name),
3d14c5d2 1222 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 1223 sup_feat, server_feat, server_feat & ~sup_feat);
1224 con->error_msg = "missing required protocol features";
1225 fail_protocol(con);
1226 return -1;
1227
31b8006e 1228 case CEPH_MSGR_TAG_BADPROTOVER:
31b8006e
SW		 1229 pr_err("%s%lld %s protocol version mismatch,"
1230 " my %d != server's %d\n",
1231 ENTITY_NAME(con->peer_name),
3d14c5d2 1232 ceph_pr_addr(&con->peer_addr.in_addr),
31b8006e
SW		 1233 le32_to_cpu(con->out_connect.protocol_version),
1234 le32_to_cpu(con->in_reply.protocol_version));
1235 con->error_msg = "protocol version mismatch";
04a419f9 1236 fail_protocol(con);
31b8006e
SW		 1237 return -1;
1238
4e7a5dcd
SW		 1239 case CEPH_MSGR_TAG_BADAUTHORIZER:
1240 con->auth_retry++;
1241 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1242 con->auth_retry);
1243 if (con->auth_retry == 2) {
1244 con->error_msg = "connect authorization failure";
1245 reset_connection(con);
1246 set_bit(CLOSED, &con->state);
1247 return -1;
1248 }
1249 con->auth_retry = 1;
1250 prepare_write_connect(con->msgr, con, 0);
63733a0f 1251 prepare_read_connect(con);
4e7a5dcd 1252 break;
31b8006e
SW		 1253
1254 case CEPH_MSGR_TAG_RESETSESSION:
1255 /*
1256 * If we connected with a large connect_seq but the peer
1257 * has no record of a session with us (no connection, or
1258 * connect_seq == 0), they will send RESETSESION to indicate
1259 * that they must have reset their session, and may have
1260 * dropped messages.
1261 */
1262 dout("process_connect got RESET peer seq %u\n",
1263 le32_to_cpu(con->in_connect.connect_seq));
1264 pr_err("%s%lld %s connection reset\n",
1265 ENTITY_NAME(con->peer_name),
3d14c5d2 1266 ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e 1267 reset_connection(con);
eed0ef2c 1268 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1269 prepare_read_connect(con);
1270
1271 /* Tell ceph about it. */
ec302645 1272 mutex_unlock(&con->mutex);
31b8006e
SW		 1273 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1274 if (con->ops->peer_reset)
1275 con->ops->peer_reset(con);
ec302645 1276 mutex_lock(&con->mutex);
31b8006e
SW		 1277 break;
1278
1279 case CEPH_MSGR_TAG_RETRY_SESSION:
1280 /*
1281 * If we sent a smaller connect_seq than the peer has, try
1282 * again with a larger value.
1283 */
1284 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1285 le32_to_cpu(con->out_connect.connect_seq),
1286 le32_to_cpu(con->in_connect.connect_seq));
1287 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
eed0ef2c 1288 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1289 prepare_read_connect(con);
1290 break;
1291
1292 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1293 /*
1294 * If we sent a smaller global_seq than the peer has, try
1295 * again with a larger value.
1296 */
eed0ef2c 1297 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
31b8006e
SW		 1298 con->peer_global_seq,
1299 le32_to_cpu(con->in_connect.global_seq));
1300 get_global_seq(con->msgr,
1301 le32_to_cpu(con->in_connect.global_seq));
eed0ef2c 1302 prepare_write_connect(con->msgr, con, 0);
31b8006e
SW		 1303 prepare_read_connect(con);
1304 break;
1305
1306 case CEPH_MSGR_TAG_READY:
04a419f9
SW		 1307 if (req_feat & ~server_feat) {
1308 pr_err("%s%lld %s protocol feature mismatch,"
1309 " my required %llx > server's %llx, need %llx\n",
1310 ENTITY_NAME(con->peer_name),
3d14c5d2 1311 ceph_pr_addr(&con->peer_addr.in_addr),
04a419f9
SW		 1312 req_feat, server_feat, req_feat & ~server_feat);
1313 con->error_msg = "missing required protocol features";
1314 fail_protocol(con);
1315 return -1;
1316 }
31b8006e 1317 clear_bit(CONNECTING, &con->state);
31b8006e
SW		 1318 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1319 con->connect_seq++;
aba558e2 1320 con->peer_features = server_feat;
31b8006e
SW		 1321 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1322 con->peer_global_seq,
1323 le32_to_cpu(con->in_reply.connect_seq),
1324 con->connect_seq);
1325 WARN_ON(con->connect_seq !=
1326 le32_to_cpu(con->in_reply.connect_seq));
92ac41d0
SW		 1327
1328 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1329 set_bit(LOSSYTX, &con->state);
1330
31b8006e
SW		 1331 prepare_read_tag(con);
1332 break;
1333
1334 case CEPH_MSGR_TAG_WAIT:
1335 /*
1336 * If there is a connection race (we are opening
1337 * connections to each other), one of us may just have
1338 * to WAIT. This shouldn't happen if we are the
1339 * client.
1340 */
1341 pr_err("process_connect peer connecting WAIT\n");
1342
1343 default:
1344 pr_err("connect protocol error, will retry\n");
1345 con->error_msg = "protocol error, garbage tag during connect";
1346 return -1;
1347 }
1348 return 0;
1349}
1350
1351
1352/*
1353 * read (part of) an ack
1354 */
1355static int read_partial_ack(struct ceph_connection *con)
1356{
1357 int to = 0;
1358
1359 return read_partial(con, &to, sizeof(con->in_temp_ack),
1360 &con->in_temp_ack);
1361}
1362
1363
1364/*
1365 * We can finally discard anything that's been acked.
1366 */
1367static void process_ack(struct ceph_connection *con)
1368{
1369 struct ceph_msg *m;
1370 u64 ack = le64_to_cpu(con->in_temp_ack);
1371 u64 seq;
1372
31b8006e
SW		 1373 while (!list_empty(&con->out_sent)) {
1374 m = list_first_entry(&con->out_sent, struct ceph_msg,
1375 list_head);
1376 seq = le64_to_cpu(m->hdr.seq);
1377 if (seq > ack)
1378 break;
1379 dout("got ack for seq %llu type %d at %p\n", seq,
1380 le16_to_cpu(m->hdr.type), m);
1381 ceph_msg_remove(m);
1382 }
31b8006e
SW		 1383 prepare_read_tag(con);
1384}
1385
1386
1387
1388
2450418c 1389static int read_partial_message_section(struct ceph_connection *con,
213c99ee
SW		 1390 struct kvec *section,
1391 unsigned int sec_len, u32 *crc)
2450418c 1392{
68b4476b 1393 int ret, left;
2450418c
YS		 1394
1395 BUG_ON(!section);
1396
1397 while (section->iov_len < sec_len) {
1398 BUG_ON(section->iov_base == NULL);
1399 left = sec_len - section->iov_len;
1400 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1401 section->iov_len, left);
1402 if (ret <= 0)
1403 return ret;
1404 section->iov_len += ret;
1405 if (section->iov_len == sec_len)
1406 *crc = crc32c(0, section->iov_base,
1407 section->iov_len);
1408 }
31b8006e 1409
2450418c
YS		 1410 return 1;
1411}
31b8006e 1412
2450418c
YS		 1413static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1414 struct ceph_msg_header *hdr,
1415 int *skip);
68b4476b
YS		 1416
1417
1418static int read_partial_message_pages(struct ceph_connection *con,
1419 struct page **pages,
1420 unsigned data_len, int datacrc)
1421{
1422 void *p;
1423 int ret;
1424 int left;
1425
1426 left = min((int)(data_len - con->in_msg_pos.data_pos),
1427 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1428 /* (page) data */
1429 BUG_ON(pages == NULL);
1430 p = kmap(pages[con->in_msg_pos.page]);
1431 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1432 left);
1433 if (ret > 0 && datacrc)
1434 con->in_data_crc =
1435 crc32c(con->in_data_crc,
1436 p + con->in_msg_pos.page_pos, ret);
1437 kunmap(pages[con->in_msg_pos.page]);
1438 if (ret <= 0)
1439 return ret;
1440 con->in_msg_pos.data_pos += ret;
1441 con->in_msg_pos.page_pos += ret;
1442 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1443 con->in_msg_pos.page_pos = 0;
1444 con->in_msg_pos.page++;
1445 }
1446
1447 return ret;
1448}
1449
1450#ifdef CONFIG_BLOCK
1451static int read_partial_message_bio(struct ceph_connection *con,
1452 struct bio **bio_iter, int *bio_seg,
1453 unsigned data_len, int datacrc)
1454{
1455 struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
1456 void *p;
1457 int ret, left;
1458
1459 if (IS_ERR(bv))
1460 return PTR_ERR(bv);
1461
1462 left = min((int)(data_len - con->in_msg_pos.data_pos),
1463 (int)(bv->bv_len - con->in_msg_pos.page_pos));
1464
1465 p = kmap(bv->bv_page) + bv->bv_offset;
1466
1467 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1468 left);
1469 if (ret > 0 && datacrc)
1470 con->in_data_crc =
1471 crc32c(con->in_data_crc,
1472 p + con->in_msg_pos.page_pos, ret);
1473 kunmap(bv->bv_page);
1474 if (ret <= 0)
1475 return ret;
1476 con->in_msg_pos.data_pos += ret;
1477 con->in_msg_pos.page_pos += ret;
1478 if (con->in_msg_pos.page_pos == bv->bv_len) {
1479 con->in_msg_pos.page_pos = 0;
1480 iter_bio_next(bio_iter, bio_seg);
1481 }
1482
1483 return ret;
1484}
1485#endif
1486
31b8006e
SW		 1487/*
1488 * read (part of) a message.
1489 */
1490static int read_partial_message(struct ceph_connection *con)
1491{
1492 struct ceph_msg *m = con->in_msg;
31b8006e 1493 int ret;
9d7f0f13 1494 int to, left;
c5c6b19d 1495 unsigned front_len, middle_len, data_len;
31b8006e 1496 int datacrc = con->msgr->nocrc;
2450418c 1497 int skip;
ae18756b 1498 u64 seq;
31b8006e
SW		 1499
1500 dout("read_partial_message con %p msg %p\n", con, m);
1501
1502 /* header */
1503 while (con->in_base_pos < sizeof(con->in_hdr)) {
1504 left = sizeof(con->in_hdr) - con->in_base_pos;
1505 ret = ceph_tcp_recvmsg(con->sock,
1506 (char *)&con->in_hdr + con->in_base_pos,
1507 left);
1508 if (ret <= 0)
1509 return ret;
1510 con->in_base_pos += ret;
1511 if (con->in_base_pos == sizeof(con->in_hdr)) {
1512 u32 crc = crc32c(0, (void *)&con->in_hdr,
1513 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1514 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1515 pr_err("read_partial_message bad hdr "
1516 " crc %u != expected %u\n",
1517 crc, con->in_hdr.crc);
1518 return -EBADMSG;
1519 }
1520 }
1521 }
31b8006e
SW		 1522 front_len = le32_to_cpu(con->in_hdr.front_len);
1523 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1524 return -EIO;
1525 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1526 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1527 return -EIO;
1528 data_len = le32_to_cpu(con->in_hdr.data_len);
1529 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1530 return -EIO;
1531
ae18756b
SW		 1532 /* verify seq# */
1533 seq = le64_to_cpu(con->in_hdr.seq);
1534 if ((s64)seq - (s64)con->in_seq < 1) {
df9f86fa 1535 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
ae18756b 1536 ENTITY_NAME(con->peer_name),
3d14c5d2 1537 ceph_pr_addr(&con->peer_addr.in_addr),
ae18756b
SW		 1538 seq, con->in_seq + 1);
1539 con->in_base_pos = -front_len - middle_len - data_len -
1540 sizeof(m->footer);
1541 con->in_tag = CEPH_MSGR_TAG_READY;
ae18756b
SW		 1542 return 0;
1543 } else if ((s64)seq - (s64)con->in_seq > 1) {
1544 pr_err("read_partial_message bad seq %lld expected %lld\n",
1545 seq, con->in_seq + 1);
1546 con->error_msg = "bad message sequence # for incoming message";
1547 return -EBADMSG;
1548 }
1549
31b8006e
SW		 1550 /* allocate message? */
1551 if (!con->in_msg) {
1552 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1553 con->in_hdr.front_len, con->in_hdr.data_len);
ae32be31 1554 skip = 0;
2450418c
YS		 1555 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1556 if (skip) {
31b8006e 1557 /* skip this message */
a79832f2 1558 dout("alloc_msg said skip message\n");
ae32be31 1559 BUG_ON(con->in_msg);
31b8006e
SW		 1560 con->in_base_pos = -front_len - middle_len - data_len -
1561 sizeof(m->footer);
1562 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 1563 con->in_seq++;
31b8006e
SW		 1564 return 0;
1565 }
a79832f2 1566 if (!con->in_msg) {
5b3a4db3
SW		 1567 con->error_msg =
1568 "error allocating memory for incoming message";
a79832f2 1569 return -ENOMEM;
31b8006e
SW		 1570 }
1571 m = con->in_msg;
1572 m->front.iov_len = 0; /* haven't read it yet */
2450418c
YS		 1573 if (m->middle)
1574 m->middle->vec.iov_len = 0;
9d7f0f13
YS		 1575
1576 con->in_msg_pos.page = 0;
68b4476b 1577 if (m->pages)
c5c6b19d 1578 con->in_msg_pos.page_pos = m->page_alignment;
68b4476b
YS		 1579 else
1580 con->in_msg_pos.page_pos = 0;
9d7f0f13 1581 con->in_msg_pos.data_pos = 0;
31b8006e
SW		 1582 }
1583
1584 /* front */
2450418c
YS		 1585 ret = read_partial_message_section(con, &m->front, front_len,
1586 &con->in_front_crc);
1587 if (ret <= 0)
1588 return ret;
31b8006e
SW		 1589
1590 /* middle */
2450418c 1591 if (m->middle) {
213c99ee
SW		 1592 ret = read_partial_message_section(con, &m->middle->vec,
1593 middle_len,
2450418c 1594 &con->in_middle_crc);
31b8006e
SW		 1595 if (ret <= 0)
1596 return ret;
31b8006e 1597 }
68b4476b
YS		 1598#ifdef CONFIG_BLOCK
1599 if (m->bio && !m->bio_iter)
1600 init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
1601#endif
31b8006e
SW		 1602
1603 /* (page) data */
31b8006e 1604 while (con->in_msg_pos.data_pos < data_len) {
68b4476b
YS		 1605 if (m->pages) {
1606 ret = read_partial_message_pages(con, m->pages,
1607 data_len, datacrc);
1608 if (ret <= 0)
1609 return ret;
1610#ifdef CONFIG_BLOCK
1611 } else if (m->bio) {
1612
1613 ret = read_partial_message_bio(con,
1614 &m->bio_iter, &m->bio_seg,
1615 data_len, datacrc);
1616 if (ret <= 0)
1617 return ret;
1618#endif
1619 } else {
1620 BUG_ON(1);
31b8006e
SW		 1621 }
1622 }
1623
31b8006e
SW		 1624 /* footer */
1625 to = sizeof(m->hdr) + sizeof(m->footer);
1626 while (con->in_base_pos < to) {
1627 left = to - con->in_base_pos;
1628 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1629 (con->in_base_pos - sizeof(m->hdr)),
1630 left);
1631 if (ret <= 0)
1632 return ret;
1633 con->in_base_pos += ret;
1634 }
1635 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1636 m, front_len, m->footer.front_crc, middle_len,
1637 m->footer.middle_crc, data_len, m->footer.data_crc);
1638
1639 /* crc ok? */
1640 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1641 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1642 m, con->in_front_crc, m->footer.front_crc);
1643 return -EBADMSG;
1644 }
1645 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1646 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1647 m, con->in_middle_crc, m->footer.middle_crc);
1648 return -EBADMSG;
1649 }
1650 if (datacrc &&
1651 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1652 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1653 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1654 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1655 return -EBADMSG;
1656 }
1657
1658 return 1; /* done! */
1659}
1660
1661/*
1662 * Process message. This happens in the worker thread. The callback should
1663 * be careful not to do anything that waits on other incoming messages or it
1664 * may deadlock.
1665 */
1666static void process_message(struct ceph_connection *con)
1667{
5e095e8b 1668 struct ceph_msg *msg;
31b8006e 1669
5e095e8b 1670 msg = con->in_msg;
31b8006e
SW		 1671 con->in_msg = NULL;
1672
1673 /* if first message, set peer_name */
1674 if (con->peer_name.type == 0)
dbad185d 1675 con->peer_name = msg->hdr.src;
31b8006e 1676
31b8006e 1677 con->in_seq++;
ec302645 1678 mutex_unlock(&con->mutex);
31b8006e
SW		 1679
1680 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1681 msg, le64_to_cpu(msg->hdr.seq),
dbad185d 1682 ENTITY_NAME(msg->hdr.src),
31b8006e
SW		 1683 le16_to_cpu(msg->hdr.type),
1684 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1685 le32_to_cpu(msg->hdr.front_len),
1686 le32_to_cpu(msg->hdr.data_len),
1687 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1688 con->ops->dispatch(con, msg);
ec302645
SW		 1689
1690 mutex_lock(&con->mutex);
31b8006e
SW		 1691 prepare_read_tag(con);
1692}
1693
1694
1695/*
1696 * Write something to the socket. Called in a worker thread when the
1697 * socket appears to be writeable and we have something ready to send.
1698 */
1699static int try_write(struct ceph_connection *con)
1700{
1701 struct ceph_messenger *msgr = con->msgr;
1702 int ret = 1;
1703
1704 dout("try_write start %p state %lu nref %d\n", con, con->state,
1705 atomic_read(&con->nref));
1706
31b8006e
SW		 1707more:
1708 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1709
1710 /* open the socket first? */
1711 if (con->sock == NULL) {
1712 /*
1713 * if we were STANDBY and are reconnecting _this_
1714 * connection, bump connect_seq now. Always bump
1715 * global_seq.
1716 */
1717 if (test_and_clear_bit(STANDBY, &con->state))
1718 con->connect_seq++;
1719
eed0ef2c
SW		 1720 prepare_write_banner(msgr, con);
1721 prepare_write_connect(msgr, con, 1);
1722 prepare_read_banner(con);
31b8006e 1723 set_bit(CONNECTING, &con->state);
eed0ef2c 1724 clear_bit(NEGOTIATING, &con->state);
31b8006e 1725
cf3e5c40 1726 BUG_ON(con->in_msg);
31b8006e
SW		 1727 con->in_tag = CEPH_MSGR_TAG_READY;
1728 dout("try_write initiating connect on %p new state %lu\n",
1729 con, con->state);
1730 con->sock = ceph_tcp_connect(con);
1731 if (IS_ERR(con->sock)) {
1732 con->sock = NULL;
1733 con->error_msg = "connect error";
1734 ret = -1;
1735 goto out;
1736 }
1737 }
1738
1739more_kvec:
1740 /* kvec data queued? */
1741 if (con->out_skip) {
1742 ret = write_partial_skip(con);
1743 if (ret <= 0)
1744 goto done;
1745 if (ret < 0) {
1746 dout("try_write write_partial_skip err %d\n", ret);
1747 goto done;
1748 }
1749 }
1750 if (con->out_kvec_left) {
1751 ret = write_partial_kvec(con);
1752 if (ret <= 0)
1753 goto done;
31b8006e
SW		 1754 }
1755
1756 /* msg pages? */
1757 if (con->out_msg) {
c86a2930
SW		 1758 if (con->out_msg_done) {
1759 ceph_msg_put(con->out_msg);
1760 con->out_msg = NULL; /* we're done with this one */
1761 goto do_next;
1762 }
1763
31b8006e
SW		 1764 ret = write_partial_msg_pages(con);
1765 if (ret == 1)
1766 goto more_kvec; /* we need to send the footer, too! */
1767 if (ret == 0)
1768 goto done;
1769 if (ret < 0) {
1770 dout("try_write write_partial_msg_pages err %d\n",
1771 ret);
1772 goto done;
1773 }
1774 }
1775
c86a2930 1776do_next:
31b8006e
SW		 1777 if (!test_bit(CONNECTING, &con->state)) {
1778 /* is anything else pending? */
1779 if (!list_empty(&con->out_queue)) {
1780 prepare_write_message(con);
1781 goto more;
1782 }
1783 if (con->in_seq > con->in_seq_acked) {
1784 prepare_write_ack(con);
1785 goto more;
1786 }
1787 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1788 prepare_write_keepalive(con);
1789 goto more;
1790 }
1791 }
1792
1793 /* Nothing to do! */
1794 clear_bit(WRITE_PENDING, &con->state);
1795 dout("try_write nothing else to write.\n");
1796done:
1797 ret = 0;
1798out:
31b8006e
SW		 1799 dout("try_write done on %p\n", con);
1800 return ret;
1801}
1802
1803
1804
1805/*
1806 * Read what we can from the socket.
1807 */
1808static int try_read(struct ceph_connection *con)
1809{
31b8006e
SW		 1810 int ret = -1;
1811
1812 if (!con->sock)
1813 return 0;
1814
1815 if (test_bit(STANDBY, &con->state))
1816 return 0;
1817
1818 dout("try_read start on %p\n", con);
ec302645 1819
31b8006e
SW		 1820more:
1821 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1822 con->in_base_pos);
1823 if (test_bit(CONNECTING, &con->state)) {
eed0ef2c
SW		 1824 if (!test_bit(NEGOTIATING, &con->state)) {
1825 dout("try_read connecting\n");
1826 ret = read_partial_banner(con);
1827 if (ret <= 0)
eed0ef2c 1828 goto out;
98bdb0aa
SW		 1829 ret = process_banner(con);
1830 if (ret < 0)
1831 goto out;
eed0ef2c 1832 }
31b8006e
SW		 1833 ret = read_partial_connect(con);
1834 if (ret <= 0)
31b8006e 1835 goto out;
98bdb0aa
SW		 1836 ret = process_connect(con);
1837 if (ret < 0)
1838 goto out;
31b8006e
SW		 1839 goto more;
1840 }
1841
1842 if (con->in_base_pos < 0) {
1843 /*
1844 * skipping + discarding content.
1845 *
1846 * FIXME: there must be a better way to do this!
1847 */
1848 static char buf[1024];
1849 int skip = min(1024, -con->in_base_pos);
1850 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1851 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1852 if (ret <= 0)
98bdb0aa 1853 goto out;
31b8006e
SW		 1854 con->in_base_pos += ret;
1855 if (con->in_base_pos)
1856 goto more;
1857 }
1858 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1859 /*
1860 * what's next?
1861 */
1862 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1863 if (ret <= 0)
98bdb0aa 1864 goto out;
31b8006e
SW		 1865 dout("try_read got tag %d\n", (int)con->in_tag);
1866 switch (con->in_tag) {
1867 case CEPH_MSGR_TAG_MSG:
1868 prepare_read_message(con);
1869 break;
1870 case CEPH_MSGR_TAG_ACK:
1871 prepare_read_ack(con);
1872 break;
1873 case CEPH_MSGR_TAG_CLOSE:
1874 set_bit(CLOSED, &con->state); /* fixme */
98bdb0aa 1875 goto out;
31b8006e
SW		 1876 default:
1877 goto bad_tag;
1878 }
1879 }
1880 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1881 ret = read_partial_message(con);
1882 if (ret <= 0) {
1883 switch (ret) {
1884 case -EBADMSG:
1885 con->error_msg = "bad crc";
1886 ret = -EIO;
98bdb0aa 1887 break;
31b8006e
SW		 1888 case -EIO:
1889 con->error_msg = "io error";
98bdb0aa 1890 break;
31b8006e 1891 }
98bdb0aa 1892 goto out;
31b8006e
SW		 1893 }
1894 if (con->in_tag == CEPH_MSGR_TAG_READY)
1895 goto more;
1896 process_message(con);
1897 goto more;
1898 }
1899 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1900 ret = read_partial_ack(con);
1901 if (ret <= 0)
98bdb0aa 1902 goto out;
31b8006e
SW		 1903 process_ack(con);
1904 goto more;
1905 }
1906
31b8006e 1907out:
98bdb0aa 1908 dout("try_read done on %p ret %d\n", con, ret);
31b8006e
SW		 1909 return ret;
1910
1911bad_tag:
1912 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1913 con->error_msg = "protocol error, garbage tag";
1914 ret = -1;
1915 goto out;
1916}
1917
1918
1919/*
1920 * Atomically queue work on a connection. Bump @con reference to
1921 * avoid races with connection teardown.
31b8006e
SW		 1922 */
1923static void queue_con(struct ceph_connection *con)
1924{
1925 if (test_bit(DEAD, &con->state)) {
1926 dout("queue_con %p ignoring: DEAD\n",
1927 con);
1928 return;
1929 }
1930
1931 if (!con->ops->get(con)) {
1932 dout("queue_con %p ref count 0\n", con);
1933 return;
1934 }
1935
f363e45f 1936 if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
31b8006e
SW		 1937 dout("queue_con %p - already queued\n", con);
1938 con->ops->put(con);
1939 } else {
1940 dout("queue_con %p\n", con);
1941 }
1942}
1943
1944/*
1945 * Do some work on a connection. Drop a connection ref when we're done.
1946 */
1947static void con_work(struct work_struct *work)
1948{
1949 struct ceph_connection *con = container_of(work, struct ceph_connection,
1950 work.work);
31b8006e 1951
9dd4658d
SW		 1952 mutex_lock(&con->mutex);
1953
31b8006e
SW		 1954 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1955 dout("con_work CLOSED\n");
1956 con_close_socket(con);
1957 goto done;
1958 }
1959 if (test_and_clear_bit(OPENING, &con->state)) {
1960 /* reopen w/ new peer */
1961 dout("con_work OPENING\n");
1962 con_close_socket(con);
1963 }
1964
1965 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1966 try_read(con) < 0 ||
1967 try_write(con) < 0) {
9dd4658d 1968 mutex_unlock(&con->mutex);
31b8006e 1969 ceph_fault(con); /* error/fault path */
9dd4658d 1970 goto done_unlocked;
31b8006e
SW		 1971 }
1972
1973done:
9dd4658d 1974 mutex_unlock(&con->mutex);
9dd4658d 1975done_unlocked:
31b8006e
SW		 1976 con->ops->put(con);
1977}
1978
1979
1980/*
1981 * Generic error/fault handler. A retry mechanism is used with
1982 * exponential backoff
1983 */
1984static void ceph_fault(struct ceph_connection *con)
1985{
1986 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
3d14c5d2 1987 ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
31b8006e 1988 dout("fault %p state %lu to peer %s\n",
3d14c5d2 1989 con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
31b8006e
SW		 1990
1991 if (test_bit(LOSSYTX, &con->state)) {
1992 dout("fault on LOSSYTX channel\n");
1993 goto out;
1994 }
1995
ec302645 1996 mutex_lock(&con->mutex);
91e45ce3
SW		 1997 if (test_bit(CLOSED, &con->state))
1998 goto out_unlock;
ec302645 1999
31b8006e 2000 con_close_socket(con);
5e095e8b
SW		 2001
2002 if (con->in_msg) {
2003 ceph_msg_put(con->in_msg);
2004 con->in_msg = NULL;
2005 }
31b8006e 2006
e80a52d1
SW		 2007 /* Requeue anything that hasn't been acked */
2008 list_splice_init(&con->out_sent, &con->out_queue);
9bd2e6f8 2009
31b8006e
SW		 2010 /* If there are no messages in the queue, place the connection
2011 * in a STANDBY state (i.e., don't try to reconnect just yet). */
31b8006e
SW		 2012 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
2013 dout("fault setting STANDBY\n");
2014 set_bit(STANDBY, &con->state);
e80a52d1
SW		 2015 } else {
2016 /* retry after a delay. */
2017 if (con->delay == 0)
2018 con->delay = BASE_DELAY_INTERVAL;
2019 else if (con->delay < MAX_DELAY_INTERVAL)
2020 con->delay *= 2;
2021 dout("fault queueing %p delay %lu\n", con, con->delay);
2022 con->ops->get(con);
2023 if (queue_delayed_work(ceph_msgr_wq, &con->work,
2024 round_jiffies_relative(con->delay)) == 0)
2025 con->ops->put(con);
31b8006e
SW		 2026 }
2027
91e45ce3
SW		 2028out_unlock:
2029 mutex_unlock(&con->mutex);
31b8006e 2030out:
161fd65a
SW		 2031 /*
2032 * in case we faulted due to authentication, invalidate our
2033 * current tickets so that we can get new ones.
213c99ee 2034 */
161fd65a
SW		 2035 if (con->auth_retry && con->ops->invalidate_authorizer) {
2036 dout("calling invalidate_authorizer()\n");
2037 con->ops->invalidate_authorizer(con);
2038 }
2039
31b8006e
SW		 2040 if (con->ops->fault)
2041 con->ops->fault(con);
2042}
2043
2044
2045
2046/*
2047 * create a new messenger instance
2048 */
3d14c5d2
YS		 2049struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr,
2050 u32 supported_features,
2051 u32 required_features)
31b8006e
SW		 2052{
2053 struct ceph_messenger *msgr;
2054
2055 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
2056 if (msgr == NULL)
2057 return ERR_PTR(-ENOMEM);
2058
3d14c5d2
YS		 2059 msgr->supported_features = supported_features;
2060 msgr->required_features = required_features;
2061
31b8006e
SW		 2062 spin_lock_init(&msgr->global_seq_lock);
2063
2064 /* the zero page is needed if a request is "canceled" while the message
2065 * is being written over the socket */
31459fe4 2066 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
31b8006e
SW		 2067 if (!msgr->zero_page) {
2068 kfree(msgr);
2069 return ERR_PTR(-ENOMEM);
2070 }
2071 kmap(msgr->zero_page);
2072
2073 if (myaddr)
2074 msgr->inst.addr = *myaddr;
2075
2076 /* select a random nonce */
ac8839d7 2077 msgr->inst.addr.type = 0;
103e2d3a 2078 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
63f2d211 2079 encode_my_addr(msgr);
31b8006e
SW		 2080
2081 dout("messenger_create %p\n", msgr);
2082 return msgr;
2083}
3d14c5d2 2084EXPORT_SYMBOL(ceph_messenger_create);
31b8006e
SW		 2085
2086void ceph_messenger_destroy(struct ceph_messenger *msgr)
2087{
2088 dout("destroy %p\n", msgr);
2089 kunmap(msgr->zero_page);
2090 __free_page(msgr->zero_page);
2091 kfree(msgr);
2092 dout("destroyed messenger %p\n", msgr);
2093}
3d14c5d2 2094EXPORT_SYMBOL(ceph_messenger_destroy);
31b8006e
SW		 2095
2096/*
2097 * Queue up an outgoing message on the given connection.
2098 */
2099void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
2100{
2101 if (test_bit(CLOSED, &con->state)) {
2102 dout("con_send %p closed, dropping %p\n", con, msg);
2103 ceph_msg_put(msg);
2104 return;
2105 }
2106
2107 /* set src+dst */
dbad185d 2108 msg->hdr.src = con->msgr->inst.name;
31b8006e 2109
3ca02ef9
SW		 2110 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
2111
e84346b7
SW		 2112 msg->needs_out_seq = true;
2113
31b8006e 2114 /* queue */
ec302645 2115 mutex_lock(&con->mutex);
31b8006e
SW		 2116 BUG_ON(!list_empty(&msg->list_head));
2117 list_add_tail(&msg->list_head, &con->out_queue);
2118 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
2119 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
2120 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
2121 le32_to_cpu(msg->hdr.front_len),
2122 le32_to_cpu(msg->hdr.middle_len),
2123 le32_to_cpu(msg->hdr.data_len));
ec302645 2124 mutex_unlock(&con->mutex);
31b8006e
SW		 2125
2126 /* if there wasn't anything waiting to send before, queue
2127 * new work */
2128 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2129 queue_con(con);
2130}
3d14c5d2 2131EXPORT_SYMBOL(ceph_con_send);
31b8006e
SW		 2132
2133/*
2134 * Revoke a message that was previously queued for send
2135 */
2136void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2137{
ec302645 2138 mutex_lock(&con->mutex);
31b8006e 2139 if (!list_empty(&msg->list_head)) {
ed98adad 2140 dout("con_revoke %p msg %p - was on queue\n", con, msg);
31b8006e
SW		 2141 list_del_init(&msg->list_head);
2142 ceph_msg_put(msg);
2143 msg->hdr.seq = 0;
ed98adad
SW		 2144 }
2145 if (con->out_msg == msg) {
2146 dout("con_revoke %p msg %p - was sending\n", con, msg);
2147 con->out_msg = NULL;
31b8006e
SW		 2148 if (con->out_kvec_is_msg) {
2149 con->out_skip = con->out_kvec_bytes;
2150 con->out_kvec_is_msg = false;
2151 }
ed98adad
SW		 2152 ceph_msg_put(msg);
2153 msg->hdr.seq = 0;
31b8006e 2154 }
ec302645 2155 mutex_unlock(&con->mutex);
31b8006e
SW		 2156}
2157
350b1c32 2158/*
0d59ab81 2159 * Revoke a message that we may be reading data into
350b1c32 2160 */
0d59ab81 2161void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
350b1c32
SW		 2162{
2163 mutex_lock(&con->mutex);
0d59ab81
YS		 2164 if (con->in_msg && con->in_msg == msg) {
2165 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2166 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
350b1c32
SW		 2167 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2168
2169 /* skip rest of message */
0d59ab81 2170 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
350b1c32
SW		 2171 con->in_base_pos = con->in_base_pos -
2172 sizeof(struct ceph_msg_header) -
0d59ab81
YS		 2173 front_len -
2174 middle_len -
2175 data_len -
350b1c32 2176 sizeof(struct ceph_msg_footer);
350b1c32
SW		 2177 ceph_msg_put(con->in_msg);
2178 con->in_msg = NULL;
2179 con->in_tag = CEPH_MSGR_TAG_READY;
684be25c 2180 con->in_seq++;
350b1c32
SW		 2181 } else {
2182 dout("con_revoke_pages %p msg %p pages %p no-op\n",
0d59ab81 2183 con, con->in_msg, msg);
350b1c32
SW		 2184 }
2185 mutex_unlock(&con->mutex);
2186}
2187
31b8006e
SW		 2188/*
2189 * Queue a keepalive byte to ensure the tcp connection is alive.
2190 */
2191void ceph_con_keepalive(struct ceph_connection *con)
2192{
2193 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2194 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2195 queue_con(con);
2196}
3d14c5d2 2197EXPORT_SYMBOL(ceph_con_keepalive);
31b8006e
SW		 2198
2199
2200/*
2201 * construct a new message with given type, size
2202 * the new msg has a ref count of 1.
2203 */
34d23762 2204struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
31b8006e
SW		 2205{
2206 struct ceph_msg *m;
2207
34d23762 2208 m = kmalloc(sizeof(*m), flags);
31b8006e
SW		 2209 if (m == NULL)
2210 goto out;
c2e552e7 2211 kref_init(&m->kref);
31b8006e
SW		 2212 INIT_LIST_HEAD(&m->list_head);
2213
45c6ceb5 2214 m->hdr.tid = 0;
31b8006e 2215 m->hdr.type = cpu_to_le16(type);
45c6ceb5
SW		 2216 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2217 m->hdr.version = 0;
31b8006e
SW		 2218 m->hdr.front_len = cpu_to_le32(front_len);
2219 m->hdr.middle_len = 0;
bb257664
SW		 2220 m->hdr.data_len = 0;
2221 m->hdr.data_off = 0;
45c6ceb5 2222 m->hdr.reserved = 0;
31b8006e
SW		 2223 m->footer.front_crc = 0;
2224 m->footer.middle_crc = 0;
2225 m->footer.data_crc = 0;
45c6ceb5 2226 m->footer.flags = 0;
31b8006e
SW		 2227 m->front_max = front_len;
2228 m->front_is_vmalloc = false;
2229 m->more_to_follow = false;
2230 m->pool = NULL;
2231
2232 /* front */
2233 if (front_len) {
2234 if (front_len > PAGE_CACHE_SIZE) {
34d23762 2235 m->front.iov_base = __vmalloc(front_len, flags,
31b8006e
SW		 2236 PAGE_KERNEL);
2237 m->front_is_vmalloc = true;
2238 } else {
34d23762 2239 m->front.iov_base = kmalloc(front_len, flags);
31b8006e
SW		 2240 }
2241 if (m->front.iov_base == NULL) {
2242 pr_err("msg_new can't allocate %d bytes\n",
2243 front_len);
2244 goto out2;
2245 }
2246 } else {
2247 m->front.iov_base = NULL;
2248 }
2249 m->front.iov_len = front_len;
2250
2251 /* middle */
2252 m->middle = NULL;
2253
2254 /* data */
bb257664 2255 m->nr_pages = 0;
c5c6b19d 2256 m->page_alignment = 0;
bb257664 2257 m->pages = NULL;
58bb3b37 2258 m->pagelist = NULL;
68b4476b
YS		 2259 m->bio = NULL;
2260 m->bio_iter = NULL;
2261 m->bio_seg = 0;
2262 m->trail = NULL;
31b8006e 2263
bb257664 2264 dout("ceph_msg_new %p front %d\n", m, front_len);
31b8006e
SW		 2265 return m;
2266
2267out2:
2268 ceph_msg_put(m);
2269out:
bb257664 2270 pr_err("msg_new can't create type %d front %d\n", type, front_len);
a79832f2 2271 return NULL;
31b8006e 2272}
3d14c5d2 2273EXPORT_SYMBOL(ceph_msg_new);
31b8006e 2274
31b8006e
SW		 2275/*
2276 * Allocate "middle" portion of a message, if it is needed and wasn't
2277 * allocated by alloc_msg. This allows us to read a small fixed-size
2278 * per-type header in the front and then gracefully fail (i.e.,
2279 * propagate the error to the caller based on info in the front) when
2280 * the middle is too large.
2281 */
2450418c 2282static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
31b8006e
SW		 2283{
2284 int type = le16_to_cpu(msg->hdr.type);
2285 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2286
2287 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2288 ceph_msg_type_name(type), middle_len);
2289 BUG_ON(!middle_len);
2290 BUG_ON(msg->middle);
2291
b6c1d5b8 2292 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
31b8006e
SW		 2293 if (!msg->middle)
2294 return -ENOMEM;
2295 return 0;
2296}
2297
2450418c
YS		 2298/*
2299 * Generic message allocator, for incoming messages.
2300 */
2301static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2302 struct ceph_msg_header *hdr,
2303 int *skip)
2304{
2305 int type = le16_to_cpu(hdr->type);
2306 int front_len = le32_to_cpu(hdr->front_len);
2307 int middle_len = le32_to_cpu(hdr->middle_len);
2308 struct ceph_msg *msg = NULL;
2309 int ret;
2310
2311 if (con->ops->alloc_msg) {
0547a9b3 2312 mutex_unlock(&con->mutex);
2450418c 2313 msg = con->ops->alloc_msg(con, hdr, skip);
0547a9b3 2314 mutex_lock(&con->mutex);
a79832f2 2315 if (!msg || *skip)
2450418c
YS		 2316 return NULL;
2317 }
2318 if (!msg) {
2319 *skip = 0;
34d23762 2320 msg = ceph_msg_new(type, front_len, GFP_NOFS);
2450418c
YS		 2321 if (!msg) {
2322 pr_err("unable to allocate msg type %d len %d\n",
2323 type, front_len);
a79832f2 2324 return NULL;
2450418c 2325 }
c5c6b19d 2326 msg->page_alignment = le16_to_cpu(hdr->data_off);
2450418c 2327 }
9d7f0f13 2328 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2450418c 2329
bb257664 2330 if (middle_len && !msg->middle) {
2450418c 2331 ret = ceph_alloc_middle(con, msg);
2450418c
YS		 2332 if (ret < 0) {
2333 ceph_msg_put(msg);
a79832f2 2334 return NULL;
2450418c
YS		 2335 }
2336 }
9d7f0f13 2337
2450418c
YS		 2338 return msg;
2339}
2340
31b8006e
SW		 2341
2342/*
2343 * Free a generically kmalloc'd message.
2344 */
2345void ceph_msg_kfree(struct ceph_msg *m)
2346{
2347 dout("msg_kfree %p\n", m);
2348 if (m->front_is_vmalloc)
2349 vfree(m->front.iov_base);
2350 else
2351 kfree(m->front.iov_base);
2352 kfree(m);
2353}
2354
2355/*
2356 * Drop a msg ref. Destroy as needed.
2357 */
c2e552e7
SW		 2358void ceph_msg_last_put(struct kref *kref)
2359{
2360 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
31b8006e 2361
c2e552e7
SW		 2362 dout("ceph_msg_put last one on %p\n", m);
2363 WARN_ON(!list_empty(&m->list_head));
2364
2365 /* drop middle, data, if any */
2366 if (m->middle) {
2367 ceph_buffer_put(m->middle);
2368 m->middle = NULL;
31b8006e 2369 }
c2e552e7
SW		 2370 m->nr_pages = 0;
2371 m->pages = NULL;
2372
58bb3b37
SW		 2373 if (m->pagelist) {
2374 ceph_pagelist_release(m->pagelist);
2375 kfree(m->pagelist);
2376 m->pagelist = NULL;
2377 }
2378
68b4476b
YS		 2379 m->trail = NULL;
2380
c2e552e7
SW		 2381 if (m->pool)
2382 ceph_msgpool_put(m->pool, m);
2383 else
2384 ceph_msg_kfree(m);
31b8006e 2385}
3d14c5d2 2386EXPORT_SYMBOL(ceph_msg_last_put);
9ec7cab1
SW		 2387
2388void ceph_msg_dump(struct ceph_msg *msg)
2389{
2390 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2391 msg->front_max, msg->nr_pages);
2392 print_hex_dump(KERN_DEBUG, "header: ",
2393 DUMP_PREFIX_OFFSET, 16, 1,
2394 &msg->hdr, sizeof(msg->hdr), true);
2395 print_hex_dump(KERN_DEBUG, " front: ",
2396 DUMP_PREFIX_OFFSET, 16, 1,
2397 msg->front.iov_base, msg->front.iov_len, true);
2398 if (msg->middle)
2399 print_hex_dump(KERN_DEBUG, "middle: ",
2400 DUMP_PREFIX_OFFSET, 16, 1,
2401 msg->middle->vec.iov_base,
2402 msg->middle->vec.iov_len, true);
2403 print_hex_dump(KERN_DEBUG, "footer: ",
2404 DUMP_PREFIX_OFFSET, 16, 1,
2405 &msg->footer, sizeof(msg->footer), true);
2406}
3d14c5d2 2407EXPORT_SYMBOL(ceph_msg_dump);
kernel source for telekom puls (alcatel/mediatek)