1 #include "ceph_debug.h"
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>
9 #include <linux/socket.h>
10 #include <linux/string.h>
14 #include "messenger.h"
18 * Ceph uses the messenger to exchange ceph_msg messages with other
19 * hosts in the system. The messenger provides ordered and reliable
20 * delivery. We tolerate TCP disconnects by reconnecting (with
21 * exponential backoff) in the case of a fault (disconnection, bad
22 * crc, protocol error). Acks allow sent messages to be discarded by
26 /* static tag bytes (protocol control messages) */
27 static char tag_msg = CEPH_MSGR_TAG_MSG;
28 static char tag_ack = CEPH_MSGR_TAG_ACK;
29 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
32 static void queue_con(struct ceph_connection *con);
33 static void con_work(struct work_struct *);
34 static void ceph_fault(struct ceph_connection *con);
36 const char *ceph_name_type_str(int t)
39 case CEPH_ENTITY_TYPE_MON: return "mon";
40 case CEPH_ENTITY_TYPE_MDS: return "mds";
41 case CEPH_ENTITY_TYPE_OSD: return "osd";
42 case CEPH_ENTITY_TYPE_CLIENT: return "client";
43 case CEPH_ENTITY_TYPE_ADMIN: return "admin";
44 default: return "???";
49 * nicely render a sockaddr as a string.
51 #define MAX_ADDR_STR 20
52 static char addr_str[MAX_ADDR_STR][40];
53 static DEFINE_SPINLOCK(addr_str_lock);
54 static int last_addr_str;
56 const char *pr_addr(const struct sockaddr_storage *ss)
60 struct sockaddr_in *in4 = (void *)ss;
61 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
62 struct sockaddr_in6 *in6 = (void *)ss;
64 spin_lock(&addr_str_lock);
66 if (last_addr_str == MAX_ADDR_STR)
68 spin_unlock(&addr_str_lock);
71 switch (ss->ss_family) {
73 sprintf(s, "%u.%u.%u.%u:%u",
74 (unsigned int)quad[0],
75 (unsigned int)quad[1],
76 (unsigned int)quad[2],
77 (unsigned int)quad[3],
78 (unsigned int)ntohs(in4->sin_port));
82 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
83 in6->sin6_addr.s6_addr16[0],
84 in6->sin6_addr.s6_addr16[1],
85 in6->sin6_addr.s6_addr16[2],
86 in6->sin6_addr.s6_addr16[3],
87 in6->sin6_addr.s6_addr16[4],
88 in6->sin6_addr.s6_addr16[5],
89 in6->sin6_addr.s6_addr16[6],
90 in6->sin6_addr.s6_addr16[7],
91 (unsigned int)ntohs(in6->sin6_port));
95 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
101 static void encode_my_addr(struct ceph_messenger *msgr)
103 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
104 ceph_encode_addr(&msgr->my_enc_addr);
108 * work queue for all reading and writing to/from the socket.
110 struct workqueue_struct *ceph_msgr_wq;
112 int __init ceph_msgr_init(void)
114 ceph_msgr_wq = create_workqueue("ceph-msgr");
115 if (IS_ERR(ceph_msgr_wq)) {
116 int ret = PTR_ERR(ceph_msgr_wq);
117 pr_err("msgr_init failed to create workqueue: %d\n", ret);
124 void ceph_msgr_exit(void)
126 destroy_workqueue(ceph_msgr_wq);
130 * socket callback functions
133 /* data available on socket, or listen socket received a connect */
134 static void ceph_data_ready(struct sock *sk, int count_unused)
136 struct ceph_connection *con =
137 (struct ceph_connection *)sk->sk_user_data;
138 if (sk->sk_state != TCP_CLOSE_WAIT) {
139 dout("ceph_data_ready on %p state = %lu, queueing work\n",
145 /* socket has buffer space for writing */
146 static void ceph_write_space(struct sock *sk)
148 struct ceph_connection *con =
149 (struct ceph_connection *)sk->sk_user_data;
151 /* only queue to workqueue if there is data we want to write. */
152 if (test_bit(WRITE_PENDING, &con->state)) {
153 dout("ceph_write_space %p queueing write work\n", con);
156 dout("ceph_write_space %p nothing to write\n", con);
159 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
160 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
163 /* socket's state has changed */
164 static void ceph_state_change(struct sock *sk)
166 struct ceph_connection *con =
167 (struct ceph_connection *)sk->sk_user_data;
169 dout("ceph_state_change %p state = %lu sk_state = %u\n",
170 con, con->state, sk->sk_state);
172 if (test_bit(CLOSED, &con->state))
175 switch (sk->sk_state) {
177 dout("ceph_state_change TCP_CLOSE\n");
179 dout("ceph_state_change TCP_CLOSE_WAIT\n");
180 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
181 if (test_bit(CONNECTING, &con->state))
182 con->error_msg = "connection failed";
184 con->error_msg = "socket closed";
188 case TCP_ESTABLISHED:
189 dout("ceph_state_change TCP_ESTABLISHED\n");
196 * set up socket callbacks
198 static void set_sock_callbacks(struct socket *sock,
199 struct ceph_connection *con)
201 struct sock *sk = sock->sk;
202 sk->sk_user_data = (void *)con;
203 sk->sk_data_ready = ceph_data_ready;
204 sk->sk_write_space = ceph_write_space;
205 sk->sk_state_change = ceph_state_change;
214 * initiate connection to a remote socket.
216 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
218 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
223 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
227 sock->sk->sk_allocation = GFP_NOFS;
229 set_sock_callbacks(sock, con);
231 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
233 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
234 if (ret == -EINPROGRESS) {
235 dout("connect %s EINPROGRESS sk_state = %u\n",
236 pr_addr(&con->peer_addr.in_addr),
241 pr_err("connect %s error %d\n",
242 pr_addr(&con->peer_addr.in_addr), ret);
245 con->error_msg = "connect error";
253 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
255 struct kvec iov = {buf, len};
256 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
258 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
262 * write something. @more is true if caller will be sending more data
265 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
266 size_t kvlen, size_t len, int more)
268 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
271 msg.msg_flags |= MSG_MORE;
273 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
275 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
280 * Shutdown/close the socket for the given connection.
282 static int con_close_socket(struct ceph_connection *con)
286 dout("con_close_socket on %p sock %p\n", con, con->sock);
289 set_bit(SOCK_CLOSED, &con->state);
290 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
291 sock_release(con->sock);
293 clear_bit(SOCK_CLOSED, &con->state);
298 * Reset a connection. Discard all incoming and outgoing messages
299 * and clear *_seq state.
301 static void ceph_msg_remove(struct ceph_msg *msg)
303 list_del_init(&msg->list_head);
306 static void ceph_msg_remove_list(struct list_head *head)
308 while (!list_empty(head)) {
309 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
311 ceph_msg_remove(msg);
315 static void reset_connection(struct ceph_connection *con)
317 /* reset connection, out_queue, msg_ and connect_seq */
318 /* discard existing out_queue and msg_seq */
319 mutex_lock(&con->out_mutex);
320 ceph_msg_remove_list(&con->out_queue);
321 ceph_msg_remove_list(&con->out_sent);
323 con->connect_seq = 0;
327 mutex_unlock(&con->out_mutex);
331 * mark a peer down. drop any open connections.
333 void ceph_con_close(struct ceph_connection *con)
335 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
336 set_bit(CLOSED, &con->state); /* in case there's queued work */
337 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
338 reset_connection(con);
343 * clean up connection state
345 void ceph_con_shutdown(struct ceph_connection *con)
347 dout("con_shutdown %p\n", con);
348 reset_connection(con);
349 set_bit(DEAD, &con->state);
350 con_close_socket(con); /* silently ignore errors */
354 * Reopen a closed connection, with a new peer address.
356 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
358 dout("con_open %p %s\n", con, pr_addr(&addr->in_addr));
359 set_bit(OPENING, &con->state);
360 clear_bit(CLOSED, &con->state);
361 memcpy(&con->peer_addr, addr, sizeof(*addr));
368 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
370 dout("con_get %p nref = %d -> %d\n", con,
371 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
372 if (atomic_inc_not_zero(&con->nref))
377 void ceph_con_put(struct ceph_connection *con)
379 dout("con_put %p nref = %d -> %d\n", con,
380 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
381 BUG_ON(atomic_read(&con->nref) == 0);
382 if (atomic_dec_and_test(&con->nref)) {
383 ceph_con_shutdown(con);
389 * initialize a new connection.
391 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
393 dout("con_init %p\n", con);
394 memset(con, 0, sizeof(*con));
395 atomic_set(&con->nref, 1);
397 mutex_init(&con->out_mutex);
398 INIT_LIST_HEAD(&con->out_queue);
399 INIT_LIST_HEAD(&con->out_sent);
400 INIT_DELAYED_WORK(&con->work, con_work);
405 * We maintain a global counter to order connection attempts. Get
406 * a unique seq greater than @gt.
408 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
412 spin_lock(&msgr->global_seq_lock);
413 if (msgr->global_seq < gt)
414 msgr->global_seq = gt;
415 ret = ++msgr->global_seq;
416 spin_unlock(&msgr->global_seq_lock);
422 * Prepare footer for currently outgoing message, and finish things
423 * off. Assumes out_kvec* are already valid.. we just add on to the end.
425 static void prepare_write_message_footer(struct ceph_connection *con, int v)
427 struct ceph_msg *m = con->out_msg;
429 dout("prepare_write_message_footer %p\n", con);
430 con->out_kvec_is_msg = true;
431 con->out_kvec[v].iov_base = &m->footer;
432 con->out_kvec[v].iov_len = sizeof(m->footer);
433 con->out_kvec_bytes += sizeof(m->footer);
434 con->out_kvec_left++;
435 con->out_more = m->more_to_follow;
436 con->out_msg = NULL; /* we're done with this one */
440 * Prepare headers for the next outgoing message.
442 static void prepare_write_message(struct ceph_connection *con)
447 con->out_kvec_bytes = 0;
448 con->out_kvec_is_msg = true;
450 /* Sneak an ack in there first? If we can get it into the same
451 * TCP packet that's a good thing. */
452 if (con->in_seq > con->in_seq_acked) {
453 con->in_seq_acked = con->in_seq;
454 con->out_kvec[v].iov_base = &tag_ack;
455 con->out_kvec[v++].iov_len = 1;
456 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
457 con->out_kvec[v].iov_base = &con->out_temp_ack;
458 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
459 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
462 /* move message to sending/sent list */
463 m = list_first_entry(&con->out_queue,
464 struct ceph_msg, list_head);
465 list_move_tail(&m->list_head, &con->out_sent);
466 con->out_msg = m; /* we don't bother taking a reference here. */
468 m->hdr.seq = cpu_to_le64(++con->out_seq);
470 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
471 m, con->out_seq, le16_to_cpu(m->hdr.type),
472 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
473 le32_to_cpu(m->hdr.data_len),
475 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
477 /* tag + hdr + front + middle */
478 con->out_kvec[v].iov_base = &tag_msg;
479 con->out_kvec[v++].iov_len = 1;
480 con->out_kvec[v].iov_base = &m->hdr;
481 con->out_kvec[v++].iov_len = sizeof(m->hdr);
482 con->out_kvec[v++] = m->front;
484 con->out_kvec[v++] = m->middle->vec;
485 con->out_kvec_left = v;
486 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
487 (m->middle ? m->middle->vec.iov_len : 0);
488 con->out_kvec_cur = con->out_kvec;
490 /* fill in crc (except data pages), footer */
491 con->out_msg->hdr.crc =
492 cpu_to_le32(crc32c(0, (void *)&m->hdr,
493 sizeof(m->hdr) - sizeof(m->hdr.crc)));
494 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
495 con->out_msg->footer.front_crc =
496 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
498 con->out_msg->footer.middle_crc =
499 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
500 m->middle->vec.iov_len));
502 con->out_msg->footer.middle_crc = 0;
503 con->out_msg->footer.data_crc = 0;
504 dout("prepare_write_message front_crc %u data_crc %u\n",
505 le32_to_cpu(con->out_msg->footer.front_crc),
506 le32_to_cpu(con->out_msg->footer.middle_crc));
508 /* is there a data payload? */
509 if (le32_to_cpu(m->hdr.data_len) > 0) {
510 /* initialize page iterator */
511 con->out_msg_pos.page = 0;
512 con->out_msg_pos.page_pos =
513 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
514 con->out_msg_pos.data_pos = 0;
515 con->out_msg_pos.did_page_crc = 0;
516 con->out_more = 1; /* data + footer will follow */
518 /* no, queue up footer too and be done */
519 prepare_write_message_footer(con, v);
522 set_bit(WRITE_PENDING, &con->state);
528 static void prepare_write_ack(struct ceph_connection *con)
530 dout("prepare_write_ack %p %llu -> %llu\n", con,
531 con->in_seq_acked, con->in_seq);
532 con->in_seq_acked = con->in_seq;
534 con->out_kvec[0].iov_base = &tag_ack;
535 con->out_kvec[0].iov_len = 1;
536 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
537 con->out_kvec[1].iov_base = &con->out_temp_ack;
538 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
539 con->out_kvec_left = 2;
540 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
541 con->out_kvec_cur = con->out_kvec;
542 con->out_more = 1; /* more will follow.. eventually.. */
543 set_bit(WRITE_PENDING, &con->state);
547 * Prepare to write keepalive byte.
549 static void prepare_write_keepalive(struct ceph_connection *con)
551 dout("prepare_write_keepalive %p\n", con);
552 con->out_kvec[0].iov_base = &tag_keepalive;
553 con->out_kvec[0].iov_len = 1;
554 con->out_kvec_left = 1;
555 con->out_kvec_bytes = 1;
556 con->out_kvec_cur = con->out_kvec;
557 set_bit(WRITE_PENDING, &con->state);
561 * Connection negotiation.
565 * We connected to a peer and are saying hello.
567 static void prepare_write_banner(struct ceph_messenger *msgr,
568 struct ceph_connection *con)
570 int len = strlen(CEPH_BANNER);
572 con->out_kvec[0].iov_base = CEPH_BANNER;
573 con->out_kvec[0].iov_len = len;
574 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
575 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
576 con->out_kvec_left = 2;
577 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
578 con->out_kvec_cur = con->out_kvec;
580 set_bit(WRITE_PENDING, &con->state);
583 static void prepare_write_connect(struct ceph_messenger *msgr,
584 struct ceph_connection *con,
587 unsigned global_seq = get_global_seq(con->msgr, 0);
590 switch (con->peer_name.type) {
591 case CEPH_ENTITY_TYPE_MON:
592 proto = CEPH_MONC_PROTOCOL;
594 case CEPH_ENTITY_TYPE_OSD:
595 proto = CEPH_OSDC_PROTOCOL;
597 case CEPH_ENTITY_TYPE_MDS:
598 proto = CEPH_MDSC_PROTOCOL;
604 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
605 con->connect_seq, global_seq, proto);
606 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
607 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
608 con->out_connect.global_seq = cpu_to_le32(global_seq);
609 con->out_connect.protocol_version = cpu_to_le32(proto);
610 con->out_connect.flags = 0;
611 if (test_bit(LOSSYTX, &con->state))
612 con->out_connect.flags = CEPH_MSG_CONNECT_LOSSY;
615 con->out_kvec_left = 0;
616 con->out_kvec_bytes = 0;
618 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
619 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
620 con->out_kvec_left++;
621 con->out_kvec_bytes += sizeof(con->out_connect);
622 con->out_kvec_cur = con->out_kvec;
624 set_bit(WRITE_PENDING, &con->state);
629 * write as much of pending kvecs to the socket as we can.
631 * 0 -> socket full, but more to do
634 static int write_partial_kvec(struct ceph_connection *con)
638 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
639 while (con->out_kvec_bytes > 0) {
640 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
641 con->out_kvec_left, con->out_kvec_bytes,
645 con->out_kvec_bytes -= ret;
646 if (con->out_kvec_bytes == 0)
649 if (ret >= con->out_kvec_cur->iov_len) {
650 ret -= con->out_kvec_cur->iov_len;
652 con->out_kvec_left--;
654 con->out_kvec_cur->iov_len -= ret;
655 con->out_kvec_cur->iov_base += ret;
661 con->out_kvec_left = 0;
662 con->out_kvec_is_msg = false;
665 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
666 con->out_kvec_bytes, con->out_kvec_left, ret);
667 return ret; /* done! */
671 * Write as much message data payload as we can. If we finish, queue
673 * 1 -> done, footer is now queued in out_kvec[].
674 * 0 -> socket full, but more to do
677 static int write_partial_msg_pages(struct ceph_connection *con)
679 struct ceph_msg *msg = con->out_msg;
680 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
682 int crc = con->msgr->nocrc;
685 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
686 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
687 con->out_msg_pos.page_pos);
689 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
690 struct page *page = NULL;
694 * if we are calculating the data crc (the default), we need
695 * to map the page. if our pages[] has been revoked, use the
699 page = msg->pages[con->out_msg_pos.page];
703 page = con->msgr->zero_page;
705 kaddr = page_address(con->msgr->zero_page);
707 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
708 (int)(data_len - con->out_msg_pos.data_pos));
709 if (crc && !con->out_msg_pos.did_page_crc) {
710 void *base = kaddr + con->out_msg_pos.page_pos;
711 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
713 BUG_ON(kaddr == NULL);
714 con->out_msg->footer.data_crc =
715 cpu_to_le32(crc32c(tmpcrc, base, len));
716 con->out_msg_pos.did_page_crc = 1;
719 ret = kernel_sendpage(con->sock, page,
720 con->out_msg_pos.page_pos, len,
721 MSG_DONTWAIT | MSG_NOSIGNAL |
724 if (crc && msg->pages)
730 con->out_msg_pos.data_pos += ret;
731 con->out_msg_pos.page_pos += ret;
733 con->out_msg_pos.page_pos = 0;
734 con->out_msg_pos.page++;
735 con->out_msg_pos.did_page_crc = 0;
739 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
741 /* prepare and queue up footer, too */
743 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
744 con->out_kvec_bytes = 0;
745 con->out_kvec_left = 0;
746 con->out_kvec_cur = con->out_kvec;
747 prepare_write_message_footer(con, 0);
756 static int write_partial_skip(struct ceph_connection *con)
760 while (con->out_skip > 0) {
762 .iov_base = page_address(con->msgr->zero_page),
763 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
766 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
769 con->out_skip -= ret;
777 * Prepare to read connection handshake, or an ack.
779 static void prepare_read_banner(struct ceph_connection *con)
781 dout("prepare_read_banner %p\n", con);
782 con->in_base_pos = 0;
785 static void prepare_read_connect(struct ceph_connection *con)
787 dout("prepare_read_connect %p\n", con);
788 con->in_base_pos = 0;
791 static void prepare_read_ack(struct ceph_connection *con)
793 dout("prepare_read_ack %p\n", con);
794 con->in_base_pos = 0;
797 static void prepare_read_tag(struct ceph_connection *con)
799 dout("prepare_read_tag %p\n", con);
800 con->in_base_pos = 0;
801 con->in_tag = CEPH_MSGR_TAG_READY;
805 * Prepare to read a message.
807 static int prepare_read_message(struct ceph_connection *con)
809 dout("prepare_read_message %p\n", con);
810 BUG_ON(con->in_msg != NULL);
811 con->in_base_pos = 0;
812 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
817 static int read_partial(struct ceph_connection *con,
818 int *to, int size, void *object)
821 while (con->in_base_pos < *to) {
822 int left = *to - con->in_base_pos;
823 int have = size - left;
824 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
827 con->in_base_pos += ret;
834 * Read all or part of the connect-side handshake on a new connection
836 static int read_partial_banner(struct ceph_connection *con)
840 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
843 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
846 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
847 &con->actual_peer_addr);
850 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
851 &con->peer_addr_for_me);
858 static int read_partial_connect(struct ceph_connection *con)
862 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
864 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
868 dout("read_partial_connect %p connect_seq = %u, global_seq = %u\n",
869 con, le32_to_cpu(con->in_reply.connect_seq),
870 le32_to_cpu(con->in_reply.global_seq));
877 * Verify the hello banner looks okay.
879 static int verify_hello(struct ceph_connection *con)
881 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
882 pr_err("connect to %s got bad banner\n",
883 pr_addr(&con->peer_addr.in_addr));
884 con->error_msg = "protocol error, bad banner";
890 static bool addr_is_blank(struct sockaddr_storage *ss)
892 switch (ss->ss_family) {
894 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
897 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
898 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
899 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
900 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
905 static int addr_port(struct sockaddr_storage *ss)
907 switch (ss->ss_family) {
909 return ntohs(((struct sockaddr_in *)ss)->sin_port);
911 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
916 static void addr_set_port(struct sockaddr_storage *ss, int p)
918 switch (ss->ss_family) {
920 ((struct sockaddr_in *)ss)->sin_port = htons(p);
922 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
927 * Parse an ip[:port] list into an addr array. Use the default
928 * monitor port if a port isn't specified.
930 int ceph_parse_ips(const char *c, const char *end,
931 struct ceph_entity_addr *addr,
932 int max_count, int *count)
937 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
938 for (i = 0; i < max_count; i++) {
940 struct sockaddr_storage *ss = &addr[i].in_addr;
941 struct sockaddr_in *in4 = (void *)ss;
942 struct sockaddr_in6 *in6 = (void *)ss;
945 memset(ss, 0, sizeof(*ss));
946 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
948 ss->ss_family = AF_INET;
949 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
951 ss->ss_family = AF_INET6;
958 if (p < end && *p == ':') {
961 while (p < end && *p >= '0' && *p <= '9') {
962 port = (port * 10) + (*p - '0');
965 if (port > 65535 || port == 0)
968 port = CEPH_MON_PORT;
971 addr_set_port(ss, port);
973 dout("parse_ips got %s\n", pr_addr(ss));
990 pr_err("parse_ips bad ip '%s'\n", c);
994 static int process_banner(struct ceph_connection *con)
996 dout("process_banner on %p\n", con);
998 if (verify_hello(con) < 0)
1001 ceph_decode_addr(&con->actual_peer_addr);
1002 ceph_decode_addr(&con->peer_addr_for_me);
1005 * Make sure the other end is who we wanted. note that the other
1006 * end may not yet know their ip address, so if it's 0.0.0.0, give
1007 * them the benefit of the doubt.
1009 if (!ceph_entity_addr_is_local(&con->peer_addr,
1010 &con->actual_peer_addr) &&
1011 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1012 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1013 pr_err("wrong peer, want %s/%d, "
1015 pr_addr(&con->peer_addr.in_addr),
1016 con->peer_addr.nonce,
1017 pr_addr(&con->actual_peer_addr.in_addr),
1018 con->actual_peer_addr.nonce);
1019 con->error_msg = "protocol error, wrong peer";
1024 * did we learn our address?
1026 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1027 int port = addr_port(&con->msgr->inst.addr.in_addr);
1029 memcpy(&con->msgr->inst.addr.in_addr,
1030 &con->peer_addr_for_me.in_addr,
1031 sizeof(con->peer_addr_for_me.in_addr));
1032 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1033 encode_my_addr(con->msgr);
1034 dout("process_banner learned my addr is %s\n",
1035 pr_addr(&con->msgr->inst.addr.in_addr));
1038 set_bit(NEGOTIATING, &con->state);
1039 prepare_read_connect(con);
1043 static int process_connect(struct ceph_connection *con)
1045 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1047 switch (con->in_reply.tag) {
1048 case CEPH_MSGR_TAG_BADPROTOVER:
1049 dout("process_connect got BADPROTOVER my %d != their %d\n",
1050 le32_to_cpu(con->out_connect.protocol_version),
1051 le32_to_cpu(con->in_reply.protocol_version));
1052 pr_err("%s%lld %s protocol version mismatch,"
1053 " my %d != server's %d\n",
1054 ENTITY_NAME(con->peer_name),
1055 pr_addr(&con->peer_addr.in_addr),
1056 le32_to_cpu(con->out_connect.protocol_version),
1057 le32_to_cpu(con->in_reply.protocol_version));
1058 con->error_msg = "protocol version mismatch";
1059 if (con->ops->bad_proto)
1060 con->ops->bad_proto(con);
1061 reset_connection(con);
1062 set_bit(CLOSED, &con->state); /* in case there's queued work */
1066 case CEPH_MSGR_TAG_RESETSESSION:
1068 * If we connected with a large connect_seq but the peer
1069 * has no record of a session with us (no connection, or
1070 * connect_seq == 0), they will send RESETSESION to indicate
1071 * that they must have reset their session, and may have
1074 dout("process_connect got RESET peer seq %u\n",
1075 le32_to_cpu(con->in_connect.connect_seq));
1076 pr_err("%s%lld %s connection reset\n",
1077 ENTITY_NAME(con->peer_name),
1078 pr_addr(&con->peer_addr.in_addr));
1079 reset_connection(con);
1080 prepare_write_connect(con->msgr, con, 0);
1081 prepare_read_connect(con);
1083 /* Tell ceph about it. */
1084 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1085 if (con->ops->peer_reset)
1086 con->ops->peer_reset(con);
1089 case CEPH_MSGR_TAG_RETRY_SESSION:
1091 * If we sent a smaller connect_seq than the peer has, try
1092 * again with a larger value.
1094 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1095 le32_to_cpu(con->out_connect.connect_seq),
1096 le32_to_cpu(con->in_connect.connect_seq));
1097 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1098 prepare_write_connect(con->msgr, con, 0);
1099 prepare_read_connect(con);
1102 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1104 * If we sent a smaller global_seq than the peer has, try
1105 * again with a larger value.
1107 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1108 con->peer_global_seq,
1109 le32_to_cpu(con->in_connect.global_seq));
1110 get_global_seq(con->msgr,
1111 le32_to_cpu(con->in_connect.global_seq));
1112 prepare_write_connect(con->msgr, con, 0);
1113 prepare_read_connect(con);
1116 case CEPH_MSGR_TAG_READY:
1117 clear_bit(CONNECTING, &con->state);
1118 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1120 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1121 con->peer_global_seq,
1122 le32_to_cpu(con->in_reply.connect_seq),
1124 WARN_ON(con->connect_seq !=
1125 le32_to_cpu(con->in_reply.connect_seq));
1127 con->delay = 0; /* reset backoff memory */
1128 prepare_read_tag(con);
1131 case CEPH_MSGR_TAG_WAIT:
1133 * If there is a connection race (we are opening
1134 * connections to each other), one of us may just have
1135 * to WAIT. This shouldn't happen if we are the
1138 pr_err("process_connect peer connecting WAIT\n");
1141 pr_err("connect protocol error, will retry\n");
1142 con->error_msg = "protocol error, garbage tag during connect";
1150 * read (part of) an ack
1152 static int read_partial_ack(struct ceph_connection *con)
1156 return read_partial(con, &to, sizeof(con->in_temp_ack),
1162 * We can finally discard anything that's been acked.
1164 static void process_ack(struct ceph_connection *con)
1167 u64 ack = le64_to_cpu(con->in_temp_ack);
1170 mutex_lock(&con->out_mutex);
1171 while (!list_empty(&con->out_sent)) {
1172 m = list_first_entry(&con->out_sent, struct ceph_msg,
1174 seq = le64_to_cpu(m->hdr.seq);
1177 dout("got ack for seq %llu type %d at %p\n", seq,
1178 le16_to_cpu(m->hdr.type), m);
1181 mutex_unlock(&con->out_mutex);
1182 prepare_read_tag(con);
1191 * read (part of) a message.
1193 static int read_partial_message(struct ceph_connection *con)
1195 struct ceph_msg *m = con->in_msg;
1199 unsigned front_len, middle_len, data_len, data_off;
1200 int datacrc = con->msgr->nocrc;
1202 dout("read_partial_message con %p msg %p\n", con, m);
1205 while (con->in_base_pos < sizeof(con->in_hdr)) {
1206 left = sizeof(con->in_hdr) - con->in_base_pos;
1207 ret = ceph_tcp_recvmsg(con->sock,
1208 (char *)&con->in_hdr + con->in_base_pos,
1212 con->in_base_pos += ret;
1213 if (con->in_base_pos == sizeof(con->in_hdr)) {
1214 u32 crc = crc32c(0, (void *)&con->in_hdr,
1215 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1216 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1217 pr_err("read_partial_message bad hdr "
1218 " crc %u != expected %u\n",
1219 crc, con->in_hdr.crc);
1225 front_len = le32_to_cpu(con->in_hdr.front_len);
1226 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1228 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1229 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1231 data_len = le32_to_cpu(con->in_hdr.data_len);
1232 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1235 /* allocate message? */
1237 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1238 con->in_hdr.front_len, con->in_hdr.data_len);
1239 con->in_msg = con->ops->alloc_msg(con, &con->in_hdr);
1241 /* skip this message */
1242 dout("alloc_msg returned NULL, skipping message\n");
1243 con->in_base_pos = -front_len - middle_len - data_len -
1245 con->in_tag = CEPH_MSGR_TAG_READY;
1248 if (IS_ERR(con->in_msg)) {
1249 ret = PTR_ERR(con->in_msg);
1251 con->error_msg = "out of memory for incoming message";
1255 m->front.iov_len = 0; /* haven't read it yet */
1256 memcpy(&m->hdr, &con->in_hdr, sizeof(con->in_hdr));
1260 while (m->front.iov_len < front_len) {
1261 BUG_ON(m->front.iov_base == NULL);
1262 left = front_len - m->front.iov_len;
1263 ret = ceph_tcp_recvmsg(con->sock, (char *)m->front.iov_base +
1264 m->front.iov_len, left);
1267 m->front.iov_len += ret;
1268 if (m->front.iov_len == front_len)
1269 con->in_front_crc = crc32c(0, m->front.iov_base,
1274 while (middle_len > 0 && (!m->middle ||
1275 m->middle->vec.iov_len < middle_len)) {
1276 if (m->middle == NULL) {
1278 if (con->ops->alloc_middle)
1279 ret = con->ops->alloc_middle(con, m);
1281 dout("alloc_middle failed, skipping payload\n");
1282 con->in_base_pos = -middle_len - data_len
1283 - sizeof(m->footer);
1284 ceph_msg_put(con->in_msg);
1286 con->in_tag = CEPH_MSGR_TAG_READY;
1289 m->middle->vec.iov_len = 0;
1291 left = middle_len - m->middle->vec.iov_len;
1292 ret = ceph_tcp_recvmsg(con->sock,
1293 (char *)m->middle->vec.iov_base +
1294 m->middle->vec.iov_len, left);
1297 m->middle->vec.iov_len += ret;
1298 if (m->middle->vec.iov_len == middle_len)
1299 con->in_middle_crc = crc32c(0, m->middle->vec.iov_base,
1300 m->middle->vec.iov_len);
1304 data_off = le16_to_cpu(m->hdr.data_off);
1308 if (m->nr_pages == 0) {
1309 con->in_msg_pos.page = 0;
1310 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1311 con->in_msg_pos.data_pos = 0;
1312 /* find pages for data payload */
1313 want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
1315 if (con->ops->prepare_pages)
1316 ret = con->ops->prepare_pages(con, m, want);
1318 dout("%p prepare_pages failed, skipping payload\n", m);
1319 con->in_base_pos = -data_len - sizeof(m->footer);
1320 ceph_msg_put(con->in_msg);
1322 con->in_tag = CEPH_MSGR_TAG_READY;
1325 BUG_ON(m->nr_pages < want);
1327 while (con->in_msg_pos.data_pos < data_len) {
1328 left = min((int)(data_len - con->in_msg_pos.data_pos),
1329 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1330 BUG_ON(m->pages == NULL);
1331 p = kmap(m->pages[con->in_msg_pos.page]);
1332 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1334 if (ret > 0 && datacrc)
1336 crc32c(con->in_data_crc,
1337 p + con->in_msg_pos.page_pos, ret);
1338 kunmap(m->pages[con->in_msg_pos.page]);
1341 con->in_msg_pos.data_pos += ret;
1342 con->in_msg_pos.page_pos += ret;
1343 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1344 con->in_msg_pos.page_pos = 0;
1345 con->in_msg_pos.page++;
1351 to = sizeof(m->hdr) + sizeof(m->footer);
1352 while (con->in_base_pos < to) {
1353 left = to - con->in_base_pos;
1354 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1355 (con->in_base_pos - sizeof(m->hdr)),
1359 con->in_base_pos += ret;
1361 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1362 m, front_len, m->footer.front_crc, middle_len,
1363 m->footer.middle_crc, data_len, m->footer.data_crc);
1366 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1367 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1368 m, con->in_front_crc, m->footer.front_crc);
1371 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1372 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1373 m, con->in_middle_crc, m->footer.middle_crc);
1377 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1378 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1379 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1380 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1384 return 1; /* done! */
1388 * Process message. This happens in the worker thread. The callback should
1389 * be careful not to do anything that waits on other incoming messages or it
1392 static void process_message(struct ceph_connection *con)
1394 struct ceph_msg *msg = con->in_msg;
1398 /* if first message, set peer_name */
1399 if (con->peer_name.type == 0)
1400 con->peer_name = msg->hdr.src.name;
1402 mutex_lock(&con->out_mutex);
1404 mutex_unlock(&con->out_mutex);
1406 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1407 msg, le64_to_cpu(msg->hdr.seq),
1408 ENTITY_NAME(msg->hdr.src.name),
1409 le16_to_cpu(msg->hdr.type),
1410 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1411 le32_to_cpu(msg->hdr.front_len),
1412 le32_to_cpu(msg->hdr.data_len),
1413 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1414 con->ops->dispatch(con, msg);
1415 prepare_read_tag(con);
1420 * Write something to the socket. Called in a worker thread when the
1421 * socket appears to be writeable and we have something ready to send.
1423 static int try_write(struct ceph_connection *con)
1425 struct ceph_messenger *msgr = con->msgr;
1428 dout("try_write start %p state %lu nref %d\n", con, con->state,
1429 atomic_read(&con->nref));
1431 mutex_lock(&con->out_mutex);
1433 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1435 /* open the socket first? */
1436 if (con->sock == NULL) {
1438 * if we were STANDBY and are reconnecting _this_
1439 * connection, bump connect_seq now. Always bump
1442 if (test_and_clear_bit(STANDBY, &con->state))
1445 prepare_write_banner(msgr, con);
1446 prepare_write_connect(msgr, con, 1);
1447 prepare_read_banner(con);
1448 set_bit(CONNECTING, &con->state);
1449 clear_bit(NEGOTIATING, &con->state);
1451 con->in_tag = CEPH_MSGR_TAG_READY;
1452 dout("try_write initiating connect on %p new state %lu\n",
1454 con->sock = ceph_tcp_connect(con);
1455 if (IS_ERR(con->sock)) {
1457 con->error_msg = "connect error";
1464 /* kvec data queued? */
1465 if (con->out_skip) {
1466 ret = write_partial_skip(con);
1470 dout("try_write write_partial_skip err %d\n", ret);
1474 if (con->out_kvec_left) {
1475 ret = write_partial_kvec(con);
1479 dout("try_write write_partial_kvec err %d\n", ret);
1486 ret = write_partial_msg_pages(con);
1488 goto more_kvec; /* we need to send the footer, too! */
1492 dout("try_write write_partial_msg_pages err %d\n",
1498 if (!test_bit(CONNECTING, &con->state)) {
1499 /* is anything else pending? */
1500 if (!list_empty(&con->out_queue)) {
1501 prepare_write_message(con);
1504 if (con->in_seq > con->in_seq_acked) {
1505 prepare_write_ack(con);
1508 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1509 prepare_write_keepalive(con);
1514 /* Nothing to do! */
1515 clear_bit(WRITE_PENDING, &con->state);
1516 dout("try_write nothing else to write.\n");
1520 mutex_unlock(&con->out_mutex);
1521 dout("try_write done on %p\n", con);
1528 * Read what we can from the socket.
1530 static int try_read(struct ceph_connection *con)
1532 struct ceph_messenger *msgr;
1538 if (test_bit(STANDBY, &con->state))
1541 dout("try_read start on %p\n", con);
1545 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1547 if (test_bit(CONNECTING, &con->state)) {
1548 if (!test_bit(NEGOTIATING, &con->state)) {
1549 dout("try_read connecting\n");
1550 ret = read_partial_banner(con);
1553 if (process_banner(con) < 0) {
1558 ret = read_partial_connect(con);
1561 if (process_connect(con) < 0) {
1568 if (con->in_base_pos < 0) {
1570 * skipping + discarding content.
1572 * FIXME: there must be a better way to do this!
1574 static char buf[1024];
1575 int skip = min(1024, -con->in_base_pos);
1576 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1577 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1580 con->in_base_pos += ret;
1581 if (con->in_base_pos)
1584 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1588 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1591 dout("try_read got tag %d\n", (int)con->in_tag);
1592 switch (con->in_tag) {
1593 case CEPH_MSGR_TAG_MSG:
1594 prepare_read_message(con);
1596 case CEPH_MSGR_TAG_ACK:
1597 prepare_read_ack(con);
1599 case CEPH_MSGR_TAG_CLOSE:
1600 set_bit(CLOSED, &con->state); /* fixme */
1606 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1607 ret = read_partial_message(con);
1611 con->error_msg = "bad crc";
1615 con->error_msg = "io error";
1621 if (con->in_tag == CEPH_MSGR_TAG_READY)
1623 process_message(con);
1626 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1627 ret = read_partial_ack(con);
1637 dout("try_read done on %p\n", con);
1641 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1642 con->error_msg = "protocol error, garbage tag";
1649 * Atomically queue work on a connection. Bump @con reference to
1650 * avoid races with connection teardown.
1652 * There is some trickery going on with QUEUED and BUSY because we
1653 * only want a _single_ thread operating on each connection at any
1654 * point in time, but we want to use all available CPUs.
1656 * The worker thread only proceeds if it can atomically set BUSY. It
1657 * clears QUEUED and does it's thing. When it thinks it's done, it
1658 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1659 * (tries again to set BUSY).
1661 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1662 * try to queue work. If that fails (work is already queued, or BUSY)
1663 * we give up (work also already being done or is queued) but leave QUEUED
1664 * set so that the worker thread will loop if necessary.
1666 static void queue_con(struct ceph_connection *con)
1668 if (test_bit(DEAD, &con->state)) {
1669 dout("queue_con %p ignoring: DEAD\n",
1674 if (!con->ops->get(con)) {
1675 dout("queue_con %p ref count 0\n", con);
1679 set_bit(QUEUED, &con->state);
1680 if (test_bit(BUSY, &con->state)) {
1681 dout("queue_con %p - already BUSY\n", con);
1683 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1684 dout("queue_con %p - already queued\n", con);
1687 dout("queue_con %p\n", con);
1692 * Do some work on a connection. Drop a connection ref when we're done.
1694 static void con_work(struct work_struct *work)
1696 struct ceph_connection *con = container_of(work, struct ceph_connection,
1701 if (test_and_set_bit(BUSY, &con->state) != 0) {
1702 dout("con_work %p BUSY already set\n", con);
1705 dout("con_work %p start, clearing QUEUED\n", con);
1706 clear_bit(QUEUED, &con->state);
1708 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1709 dout("con_work CLOSED\n");
1710 con_close_socket(con);
1713 if (test_and_clear_bit(OPENING, &con->state)) {
1714 /* reopen w/ new peer */
1715 dout("con_work OPENING\n");
1716 con_close_socket(con);
1719 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1720 try_read(con) < 0 ||
1721 try_write(con) < 0) {
1723 ceph_fault(con); /* error/fault path */
1727 clear_bit(BUSY, &con->state);
1728 dout("con->state=%lu\n", con->state);
1729 if (test_bit(QUEUED, &con->state)) {
1731 dout("con_work %p QUEUED reset, looping\n", con);
1734 dout("con_work %p QUEUED reset, but just faulted\n", con);
1735 clear_bit(QUEUED, &con->state);
1737 dout("con_work %p done\n", con);
1745 * Generic error/fault handler. A retry mechanism is used with
1746 * exponential backoff
1748 static void ceph_fault(struct ceph_connection *con)
1750 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1751 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1752 dout("fault %p state %lu to peer %s\n",
1753 con, con->state, pr_addr(&con->peer_addr.in_addr));
1755 if (test_bit(LOSSYTX, &con->state)) {
1756 dout("fault on LOSSYTX channel\n");
1760 clear_bit(BUSY, &con->state); /* to avoid an improbable race */
1762 con_close_socket(con);
1765 /* If there are no messages in the queue, place the connection
1766 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1767 mutex_lock(&con->out_mutex);
1768 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1769 dout("fault setting STANDBY\n");
1770 set_bit(STANDBY, &con->state);
1771 mutex_unlock(&con->out_mutex);
1775 /* Requeue anything that hasn't been acked, and retry after a
1777 list_splice_init(&con->out_sent, &con->out_queue);
1778 mutex_unlock(&con->out_mutex);
1780 if (con->delay == 0)
1781 con->delay = BASE_DELAY_INTERVAL;
1782 else if (con->delay < MAX_DELAY_INTERVAL)
1785 /* explicitly schedule work to try to reconnect again later. */
1786 dout("fault queueing %p delay %lu\n", con, con->delay);
1788 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1789 round_jiffies_relative(con->delay)) == 0)
1793 if (con->ops->fault)
1794 con->ops->fault(con);
1800 * create a new messenger instance
1802 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1804 struct ceph_messenger *msgr;
1806 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1808 return ERR_PTR(-ENOMEM);
1810 spin_lock_init(&msgr->global_seq_lock);
1812 /* the zero page is needed if a request is "canceled" while the message
1813 * is being written over the socket */
1814 msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1815 if (!msgr->zero_page) {
1817 return ERR_PTR(-ENOMEM);
1819 kmap(msgr->zero_page);
1822 msgr->inst.addr = *myaddr;
1824 /* select a random nonce */
1825 get_random_bytes(&msgr->inst.addr.nonce,
1826 sizeof(msgr->inst.addr.nonce));
1827 encode_my_addr(msgr);
1829 dout("messenger_create %p\n", msgr);
1833 void ceph_messenger_destroy(struct ceph_messenger *msgr)
1835 dout("destroy %p\n", msgr);
1836 kunmap(msgr->zero_page);
1837 __free_page(msgr->zero_page);
1839 dout("destroyed messenger %p\n", msgr);
1843 * Queue up an outgoing message on the given connection.
1845 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1847 if (test_bit(CLOSED, &con->state)) {
1848 dout("con_send %p closed, dropping %p\n", con, msg);
1854 msg->hdr.src.name = con->msgr->inst.name;
1855 msg->hdr.src.addr = con->msgr->my_enc_addr;
1856 msg->hdr.orig_src = msg->hdr.src;
1857 msg->hdr.dst_erank = con->peer_addr.erank;
1860 mutex_lock(&con->out_mutex);
1861 BUG_ON(!list_empty(&msg->list_head));
1862 list_add_tail(&msg->list_head, &con->out_queue);
1863 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
1864 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
1865 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1866 le32_to_cpu(msg->hdr.front_len),
1867 le32_to_cpu(msg->hdr.middle_len),
1868 le32_to_cpu(msg->hdr.data_len));
1869 mutex_unlock(&con->out_mutex);
1871 /* if there wasn't anything waiting to send before, queue
1873 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
1878 * Revoke a message that was previously queued for send
1880 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
1882 mutex_lock(&con->out_mutex);
1883 if (!list_empty(&msg->list_head)) {
1884 dout("con_revoke %p msg %p\n", con, msg);
1885 list_del_init(&msg->list_head);
1888 if (con->out_msg == msg)
1889 con->out_msg = NULL;
1890 if (con->out_kvec_is_msg) {
1891 con->out_skip = con->out_kvec_bytes;
1892 con->out_kvec_is_msg = false;
1895 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
1897 mutex_unlock(&con->out_mutex);
1901 * Queue a keepalive byte to ensure the tcp connection is alive.
1903 void ceph_con_keepalive(struct ceph_connection *con)
1905 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
1906 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
1912 * construct a new message with given type, size
1913 * the new msg has a ref count of 1.
1915 struct ceph_msg *ceph_msg_new(int type, int front_len,
1916 int page_len, int page_off, struct page **pages)
1920 m = kmalloc(sizeof(*m), GFP_NOFS);
1923 atomic_set(&m->nref, 1);
1924 INIT_LIST_HEAD(&m->list_head);
1926 m->hdr.type = cpu_to_le16(type);
1927 m->hdr.front_len = cpu_to_le32(front_len);
1928 m->hdr.middle_len = 0;
1929 m->hdr.data_len = cpu_to_le32(page_len);
1930 m->hdr.data_off = cpu_to_le16(page_off);
1931 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
1932 m->footer.front_crc = 0;
1933 m->footer.middle_crc = 0;
1934 m->footer.data_crc = 0;
1935 m->front_max = front_len;
1936 m->front_is_vmalloc = false;
1937 m->more_to_follow = false;
1942 if (front_len > PAGE_CACHE_SIZE) {
1943 m->front.iov_base = __vmalloc(front_len, GFP_NOFS,
1945 m->front_is_vmalloc = true;
1947 m->front.iov_base = kmalloc(front_len, GFP_NOFS);
1949 if (m->front.iov_base == NULL) {
1950 pr_err("msg_new can't allocate %d bytes\n",
1955 m->front.iov_base = NULL;
1957 m->front.iov_len = front_len;
1963 m->nr_pages = calc_pages_for(page_off, page_len);
1966 dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
1973 pr_err("msg_new can't create type %d len %d\n", type, front_len);
1974 return ERR_PTR(-ENOMEM);
1978 * Generic message allocator, for incoming messages.
1980 struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1981 struct ceph_msg_header *hdr)
1983 int type = le16_to_cpu(hdr->type);
1984 int front_len = le32_to_cpu(hdr->front_len);
1985 struct ceph_msg *msg = ceph_msg_new(type, front_len, 0, 0, NULL);
1988 pr_err("unable to allocate msg type %d len %d\n",
1990 return ERR_PTR(-ENOMEM);
1996 * Allocate "middle" portion of a message, if it is needed and wasn't
1997 * allocated by alloc_msg. This allows us to read a small fixed-size
1998 * per-type header in the front and then gracefully fail (i.e.,
1999 * propagate the error to the caller based on info in the front) when
2000 * the middle is too large.
2002 int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2004 int type = le16_to_cpu(msg->hdr.type);
2005 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2007 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2008 ceph_msg_type_name(type), middle_len);
2009 BUG_ON(!middle_len);
2010 BUG_ON(msg->middle);
2012 msg->middle = ceph_buffer_new_alloc(middle_len, GFP_NOFS);
2020 * Free a generically kmalloc'd message.
2022 void ceph_msg_kfree(struct ceph_msg *m)
2024 dout("msg_kfree %p\n", m);
2025 if (m->front_is_vmalloc)
2026 vfree(m->front.iov_base);
2028 kfree(m->front.iov_base);
2033 * Drop a msg ref. Destroy as needed.
2035 void ceph_msg_put(struct ceph_msg *m)
2037 dout("ceph_msg_put %p %d -> %d\n", m, atomic_read(&m->nref),
2038 atomic_read(&m->nref)-1);
2039 if (atomic_read(&m->nref) <= 0) {
2040 pr_err("bad ceph_msg_put on %p %llu %d=%s %d+%d\n",
2041 m, le64_to_cpu(m->hdr.seq),
2042 le16_to_cpu(m->hdr.type),
2043 ceph_msg_type_name(le16_to_cpu(m->hdr.type)),
2044 le32_to_cpu(m->hdr.front_len),
2045 le32_to_cpu(m->hdr.data_len));
2048 if (atomic_dec_and_test(&m->nref)) {
2049 dout("ceph_msg_put last one on %p\n", m);
2050 WARN_ON(!list_empty(&m->list_head));
2052 /* drop middle, data, if any */
2054 ceph_buffer_put(m->middle);
2061 ceph_msgpool_put(m->pool, m);