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/slab.h>
10 #include <linux/socket.h>
11 #include <linux/string.h>
15 #include "messenger.h"
20 * Ceph uses the messenger to exchange ceph_msg messages with other
21 * hosts in the system. The messenger provides ordered and reliable
22 * delivery. We tolerate TCP disconnects by reconnecting (with
23 * exponential backoff) in the case of a fault (disconnection, bad
24 * crc, protocol error). Acks allow sent messages to be discarded by
28 /* static tag bytes (protocol control messages) */
29 static char tag_msg = CEPH_MSGR_TAG_MSG;
30 static char tag_ack = CEPH_MSGR_TAG_ACK;
31 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
34 static struct lock_class_key socket_class;
38 static void queue_con(struct ceph_connection *con);
39 static void con_work(struct work_struct *);
40 static void ceph_fault(struct ceph_connection *con);
43 * nicely render a sockaddr as a string.
45 #define MAX_ADDR_STR 20
46 static char addr_str[MAX_ADDR_STR][40];
47 static DEFINE_SPINLOCK(addr_str_lock);
48 static int last_addr_str;
50 const char *pr_addr(const struct sockaddr_storage *ss)
54 struct sockaddr_in *in4 = (void *)ss;
55 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
56 struct sockaddr_in6 *in6 = (void *)ss;
58 spin_lock(&addr_str_lock);
60 if (last_addr_str == MAX_ADDR_STR)
62 spin_unlock(&addr_str_lock);
65 switch (ss->ss_family) {
67 sprintf(s, "%u.%u.%u.%u:%u",
68 (unsigned int)quad[0],
69 (unsigned int)quad[1],
70 (unsigned int)quad[2],
71 (unsigned int)quad[3],
72 (unsigned int)ntohs(in4->sin_port));
76 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
77 in6->sin6_addr.s6_addr16[0],
78 in6->sin6_addr.s6_addr16[1],
79 in6->sin6_addr.s6_addr16[2],
80 in6->sin6_addr.s6_addr16[3],
81 in6->sin6_addr.s6_addr16[4],
82 in6->sin6_addr.s6_addr16[5],
83 in6->sin6_addr.s6_addr16[6],
84 in6->sin6_addr.s6_addr16[7],
85 (unsigned int)ntohs(in6->sin6_port));
89 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
95 static void encode_my_addr(struct ceph_messenger *msgr)
97 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
98 ceph_encode_addr(&msgr->my_enc_addr);
102 * work queue for all reading and writing to/from the socket.
104 struct workqueue_struct *ceph_msgr_wq;
106 int __init ceph_msgr_init(void)
108 ceph_msgr_wq = create_workqueue("ceph-msgr");
109 if (IS_ERR(ceph_msgr_wq)) {
110 int ret = PTR_ERR(ceph_msgr_wq);
111 pr_err("msgr_init failed to create workqueue: %d\n", ret);
118 void ceph_msgr_exit(void)
120 destroy_workqueue(ceph_msgr_wq);
124 * socket callback functions
127 /* data available on socket, or listen socket received a connect */
128 static void ceph_data_ready(struct sock *sk, int count_unused)
130 struct ceph_connection *con =
131 (struct ceph_connection *)sk->sk_user_data;
132 if (sk->sk_state != TCP_CLOSE_WAIT) {
133 dout("ceph_data_ready on %p state = %lu, queueing work\n",
139 /* socket has buffer space for writing */
140 static void ceph_write_space(struct sock *sk)
142 struct ceph_connection *con =
143 (struct ceph_connection *)sk->sk_user_data;
145 /* only queue to workqueue if there is data we want to write. */
146 if (test_bit(WRITE_PENDING, &con->state)) {
147 dout("ceph_write_space %p queueing write work\n", con);
150 dout("ceph_write_space %p nothing to write\n", con);
153 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
154 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
157 /* socket's state has changed */
158 static void ceph_state_change(struct sock *sk)
160 struct ceph_connection *con =
161 (struct ceph_connection *)sk->sk_user_data;
163 dout("ceph_state_change %p state = %lu sk_state = %u\n",
164 con, con->state, sk->sk_state);
166 if (test_bit(CLOSED, &con->state))
169 switch (sk->sk_state) {
171 dout("ceph_state_change TCP_CLOSE\n");
173 dout("ceph_state_change TCP_CLOSE_WAIT\n");
174 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
175 if (test_bit(CONNECTING, &con->state))
176 con->error_msg = "connection failed";
178 con->error_msg = "socket closed";
182 case TCP_ESTABLISHED:
183 dout("ceph_state_change TCP_ESTABLISHED\n");
190 * set up socket callbacks
192 static void set_sock_callbacks(struct socket *sock,
193 struct ceph_connection *con)
195 struct sock *sk = sock->sk;
196 sk->sk_user_data = (void *)con;
197 sk->sk_data_ready = ceph_data_ready;
198 sk->sk_write_space = ceph_write_space;
199 sk->sk_state_change = ceph_state_change;
208 * initiate connection to a remote socket.
210 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
212 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
217 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
221 sock->sk->sk_allocation = GFP_NOFS;
223 #ifdef CONFIG_LOCKDEP
224 lockdep_set_class(&sock->sk->sk_lock, &socket_class);
227 set_sock_callbacks(sock, con);
229 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
231 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
232 if (ret == -EINPROGRESS) {
233 dout("connect %s EINPROGRESS sk_state = %u\n",
234 pr_addr(&con->peer_addr.in_addr),
239 pr_err("connect %s error %d\n",
240 pr_addr(&con->peer_addr.in_addr), ret);
243 con->error_msg = "connect error";
251 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
253 struct kvec iov = {buf, len};
254 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
256 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
260 * write something. @more is true if caller will be sending more data
263 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
264 size_t kvlen, size_t len, int more)
266 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
269 msg.msg_flags |= MSG_MORE;
271 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
273 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
278 * Shutdown/close the socket for the given connection.
280 static int con_close_socket(struct ceph_connection *con)
284 dout("con_close_socket on %p sock %p\n", con, con->sock);
287 set_bit(SOCK_CLOSED, &con->state);
288 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
289 sock_release(con->sock);
291 clear_bit(SOCK_CLOSED, &con->state);
296 * Reset a connection. Discard all incoming and outgoing messages
297 * and clear *_seq state.
299 static void ceph_msg_remove(struct ceph_msg *msg)
301 list_del_init(&msg->list_head);
304 static void ceph_msg_remove_list(struct list_head *head)
306 while (!list_empty(head)) {
307 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
309 ceph_msg_remove(msg);
313 static void reset_connection(struct ceph_connection *con)
315 /* reset connection, out_queue, msg_ and connect_seq */
316 /* discard existing out_queue and msg_seq */
317 ceph_msg_remove_list(&con->out_queue);
318 ceph_msg_remove_list(&con->out_sent);
321 ceph_msg_put(con->in_msg);
325 con->connect_seq = 0;
328 ceph_msg_put(con->out_msg);
331 con->out_keepalive_pending = false;
333 con->in_seq_acked = 0;
337 * mark a peer down. drop any open connections.
339 void ceph_con_close(struct ceph_connection *con)
341 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
342 set_bit(CLOSED, &con->state); /* in case there's queued work */
343 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
344 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
345 clear_bit(KEEPALIVE_PENDING, &con->state);
346 clear_bit(WRITE_PENDING, &con->state);
347 mutex_lock(&con->mutex);
348 reset_connection(con);
349 con->peer_global_seq = 0;
350 cancel_delayed_work(&con->work);
351 mutex_unlock(&con->mutex);
356 * Reopen a closed connection, with a new peer address.
358 void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
360 dout("con_open %p %s\n", con, pr_addr(&addr->in_addr));
361 set_bit(OPENING, &con->state);
362 clear_bit(CLOSED, &con->state);
363 memcpy(&con->peer_addr, addr, sizeof(*addr));
364 con->delay = 0; /* reset backoff memory */
369 * return true if this connection ever successfully opened
371 bool ceph_con_opened(struct ceph_connection *con)
373 return con->connect_seq > 0;
379 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
381 dout("con_get %p nref = %d -> %d\n", con,
382 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
383 if (atomic_inc_not_zero(&con->nref))
388 void ceph_con_put(struct ceph_connection *con)
390 dout("con_put %p nref = %d -> %d\n", con,
391 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
392 BUG_ON(atomic_read(&con->nref) == 0);
393 if (atomic_dec_and_test(&con->nref)) {
400 * initialize a new connection.
402 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
404 dout("con_init %p\n", con);
405 memset(con, 0, sizeof(*con));
406 atomic_set(&con->nref, 1);
408 mutex_init(&con->mutex);
409 INIT_LIST_HEAD(&con->out_queue);
410 INIT_LIST_HEAD(&con->out_sent);
411 INIT_DELAYED_WORK(&con->work, con_work);
416 * We maintain a global counter to order connection attempts. Get
417 * a unique seq greater than @gt.
419 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
423 spin_lock(&msgr->global_seq_lock);
424 if (msgr->global_seq < gt)
425 msgr->global_seq = gt;
426 ret = ++msgr->global_seq;
427 spin_unlock(&msgr->global_seq_lock);
433 * Prepare footer for currently outgoing message, and finish things
434 * off. Assumes out_kvec* are already valid.. we just add on to the end.
436 static void prepare_write_message_footer(struct ceph_connection *con, int v)
438 struct ceph_msg *m = con->out_msg;
440 dout("prepare_write_message_footer %p\n", con);
441 con->out_kvec_is_msg = true;
442 con->out_kvec[v].iov_base = &m->footer;
443 con->out_kvec[v].iov_len = sizeof(m->footer);
444 con->out_kvec_bytes += sizeof(m->footer);
445 con->out_kvec_left++;
446 con->out_more = m->more_to_follow;
447 con->out_msg_done = true;
451 * Prepare headers for the next outgoing message.
453 static void prepare_write_message(struct ceph_connection *con)
458 con->out_kvec_bytes = 0;
459 con->out_kvec_is_msg = true;
460 con->out_msg_done = false;
462 /* Sneak an ack in there first? If we can get it into the same
463 * TCP packet that's a good thing. */
464 if (con->in_seq > con->in_seq_acked) {
465 con->in_seq_acked = con->in_seq;
466 con->out_kvec[v].iov_base = &tag_ack;
467 con->out_kvec[v++].iov_len = 1;
468 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
469 con->out_kvec[v].iov_base = &con->out_temp_ack;
470 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
471 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
474 m = list_first_entry(&con->out_queue,
475 struct ceph_msg, list_head);
477 if (test_bit(LOSSYTX, &con->state)) {
478 list_del_init(&m->list_head);
480 /* put message on sent list */
482 list_move_tail(&m->list_head, &con->out_sent);
486 * only assign outgoing seq # if we haven't sent this message
487 * yet. if it is requeued, resend with it's original seq.
489 if (m->needs_out_seq) {
490 m->hdr.seq = cpu_to_le64(++con->out_seq);
491 m->needs_out_seq = false;
494 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
495 m, con->out_seq, le16_to_cpu(m->hdr.type),
496 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
497 le32_to_cpu(m->hdr.data_len),
499 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
501 /* tag + hdr + front + middle */
502 con->out_kvec[v].iov_base = &tag_msg;
503 con->out_kvec[v++].iov_len = 1;
504 con->out_kvec[v].iov_base = &m->hdr;
505 con->out_kvec[v++].iov_len = sizeof(m->hdr);
506 con->out_kvec[v++] = m->front;
508 con->out_kvec[v++] = m->middle->vec;
509 con->out_kvec_left = v;
510 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
511 (m->middle ? m->middle->vec.iov_len : 0);
512 con->out_kvec_cur = con->out_kvec;
514 /* fill in crc (except data pages), footer */
515 con->out_msg->hdr.crc =
516 cpu_to_le32(crc32c(0, (void *)&m->hdr,
517 sizeof(m->hdr) - sizeof(m->hdr.crc)));
518 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
519 con->out_msg->footer.front_crc =
520 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
522 con->out_msg->footer.middle_crc =
523 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
524 m->middle->vec.iov_len));
526 con->out_msg->footer.middle_crc = 0;
527 con->out_msg->footer.data_crc = 0;
528 dout("prepare_write_message front_crc %u data_crc %u\n",
529 le32_to_cpu(con->out_msg->footer.front_crc),
530 le32_to_cpu(con->out_msg->footer.middle_crc));
532 /* is there a data payload? */
533 if (le32_to_cpu(m->hdr.data_len) > 0) {
534 /* initialize page iterator */
535 con->out_msg_pos.page = 0;
536 con->out_msg_pos.page_pos =
537 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
538 con->out_msg_pos.data_pos = 0;
539 con->out_msg_pos.did_page_crc = 0;
540 con->out_more = 1; /* data + footer will follow */
542 /* no, queue up footer too and be done */
543 prepare_write_message_footer(con, v);
546 set_bit(WRITE_PENDING, &con->state);
552 static void prepare_write_ack(struct ceph_connection *con)
554 dout("prepare_write_ack %p %llu -> %llu\n", con,
555 con->in_seq_acked, con->in_seq);
556 con->in_seq_acked = con->in_seq;
558 con->out_kvec[0].iov_base = &tag_ack;
559 con->out_kvec[0].iov_len = 1;
560 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
561 con->out_kvec[1].iov_base = &con->out_temp_ack;
562 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
563 con->out_kvec_left = 2;
564 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
565 con->out_kvec_cur = con->out_kvec;
566 con->out_more = 1; /* more will follow.. eventually.. */
567 set_bit(WRITE_PENDING, &con->state);
571 * Prepare to write keepalive byte.
573 static void prepare_write_keepalive(struct ceph_connection *con)
575 dout("prepare_write_keepalive %p\n", con);
576 con->out_kvec[0].iov_base = &tag_keepalive;
577 con->out_kvec[0].iov_len = 1;
578 con->out_kvec_left = 1;
579 con->out_kvec_bytes = 1;
580 con->out_kvec_cur = con->out_kvec;
581 set_bit(WRITE_PENDING, &con->state);
585 * Connection negotiation.
588 static void prepare_connect_authorizer(struct ceph_connection *con)
592 int auth_protocol = 0;
594 mutex_unlock(&con->mutex);
595 if (con->ops->get_authorizer)
596 con->ops->get_authorizer(con, &auth_buf, &auth_len,
597 &auth_protocol, &con->auth_reply_buf,
598 &con->auth_reply_buf_len,
600 mutex_lock(&con->mutex);
602 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
603 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
605 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
606 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
607 con->out_kvec_left++;
608 con->out_kvec_bytes += auth_len;
612 * We connected to a peer and are saying hello.
614 static void prepare_write_banner(struct ceph_messenger *msgr,
615 struct ceph_connection *con)
617 int len = strlen(CEPH_BANNER);
619 con->out_kvec[0].iov_base = CEPH_BANNER;
620 con->out_kvec[0].iov_len = len;
621 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
622 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
623 con->out_kvec_left = 2;
624 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
625 con->out_kvec_cur = con->out_kvec;
627 set_bit(WRITE_PENDING, &con->state);
630 static void prepare_write_connect(struct ceph_messenger *msgr,
631 struct ceph_connection *con,
634 unsigned global_seq = get_global_seq(con->msgr, 0);
637 switch (con->peer_name.type) {
638 case CEPH_ENTITY_TYPE_MON:
639 proto = CEPH_MONC_PROTOCOL;
641 case CEPH_ENTITY_TYPE_OSD:
642 proto = CEPH_OSDC_PROTOCOL;
644 case CEPH_ENTITY_TYPE_MDS:
645 proto = CEPH_MDSC_PROTOCOL;
651 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
652 con->connect_seq, global_seq, proto);
654 con->out_connect.features = CEPH_FEATURE_SUPPORTED_CLIENT;
655 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
656 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
657 con->out_connect.global_seq = cpu_to_le32(global_seq);
658 con->out_connect.protocol_version = cpu_to_le32(proto);
659 con->out_connect.flags = 0;
662 con->out_kvec_left = 0;
663 con->out_kvec_bytes = 0;
665 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
666 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
667 con->out_kvec_left++;
668 con->out_kvec_bytes += sizeof(con->out_connect);
669 con->out_kvec_cur = con->out_kvec;
671 set_bit(WRITE_PENDING, &con->state);
673 prepare_connect_authorizer(con);
678 * write as much of pending kvecs to the socket as we can.
680 * 0 -> socket full, but more to do
683 static int write_partial_kvec(struct ceph_connection *con)
687 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
688 while (con->out_kvec_bytes > 0) {
689 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
690 con->out_kvec_left, con->out_kvec_bytes,
694 con->out_kvec_bytes -= ret;
695 if (con->out_kvec_bytes == 0)
698 if (ret >= con->out_kvec_cur->iov_len) {
699 ret -= con->out_kvec_cur->iov_len;
701 con->out_kvec_left--;
703 con->out_kvec_cur->iov_len -= ret;
704 con->out_kvec_cur->iov_base += ret;
710 con->out_kvec_left = 0;
711 con->out_kvec_is_msg = false;
714 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
715 con->out_kvec_bytes, con->out_kvec_left, ret);
716 return ret; /* done! */
720 * Write as much message data payload as we can. If we finish, queue
722 * 1 -> done, footer is now queued in out_kvec[].
723 * 0 -> socket full, but more to do
726 static int write_partial_msg_pages(struct ceph_connection *con)
728 struct ceph_msg *msg = con->out_msg;
729 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
731 int crc = con->msgr->nocrc;
734 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
735 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
736 con->out_msg_pos.page_pos);
738 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
739 struct page *page = NULL;
743 * if we are calculating the data crc (the default), we need
744 * to map the page. if our pages[] has been revoked, use the
748 page = msg->pages[con->out_msg_pos.page];
751 } else if (msg->pagelist) {
752 page = list_first_entry(&msg->pagelist->head,
757 page = con->msgr->zero_page;
759 kaddr = page_address(con->msgr->zero_page);
761 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
762 (int)(data_len - con->out_msg_pos.data_pos));
763 if (crc && !con->out_msg_pos.did_page_crc) {
764 void *base = kaddr + con->out_msg_pos.page_pos;
765 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
767 BUG_ON(kaddr == NULL);
768 con->out_msg->footer.data_crc =
769 cpu_to_le32(crc32c(tmpcrc, base, len));
770 con->out_msg_pos.did_page_crc = 1;
773 ret = kernel_sendpage(con->sock, page,
774 con->out_msg_pos.page_pos, len,
775 MSG_DONTWAIT | MSG_NOSIGNAL |
778 if (crc && (msg->pages || msg->pagelist))
784 con->out_msg_pos.data_pos += ret;
785 con->out_msg_pos.page_pos += ret;
787 con->out_msg_pos.page_pos = 0;
788 con->out_msg_pos.page++;
789 con->out_msg_pos.did_page_crc = 0;
791 list_move_tail(&page->lru,
792 &msg->pagelist->head);
796 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
798 /* prepare and queue up footer, too */
800 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
801 con->out_kvec_bytes = 0;
802 con->out_kvec_left = 0;
803 con->out_kvec_cur = con->out_kvec;
804 prepare_write_message_footer(con, 0);
813 static int write_partial_skip(struct ceph_connection *con)
817 while (con->out_skip > 0) {
819 .iov_base = page_address(con->msgr->zero_page),
820 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
823 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
826 con->out_skip -= ret;
834 * Prepare to read connection handshake, or an ack.
836 static void prepare_read_banner(struct ceph_connection *con)
838 dout("prepare_read_banner %p\n", con);
839 con->in_base_pos = 0;
842 static void prepare_read_connect(struct ceph_connection *con)
844 dout("prepare_read_connect %p\n", con);
845 con->in_base_pos = 0;
848 static void prepare_read_ack(struct ceph_connection *con)
850 dout("prepare_read_ack %p\n", con);
851 con->in_base_pos = 0;
854 static void prepare_read_tag(struct ceph_connection *con)
856 dout("prepare_read_tag %p\n", con);
857 con->in_base_pos = 0;
858 con->in_tag = CEPH_MSGR_TAG_READY;
862 * Prepare to read a message.
864 static int prepare_read_message(struct ceph_connection *con)
866 dout("prepare_read_message %p\n", con);
867 BUG_ON(con->in_msg != NULL);
868 con->in_base_pos = 0;
869 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
874 static int read_partial(struct ceph_connection *con,
875 int *to, int size, void *object)
878 while (con->in_base_pos < *to) {
879 int left = *to - con->in_base_pos;
880 int have = size - left;
881 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
884 con->in_base_pos += ret;
891 * Read all or part of the connect-side handshake on a new connection
893 static int read_partial_banner(struct ceph_connection *con)
897 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
900 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
903 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
904 &con->actual_peer_addr);
907 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
908 &con->peer_addr_for_me);
915 static int read_partial_connect(struct ceph_connection *con)
919 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
921 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
924 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
925 con->auth_reply_buf);
929 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
930 con, (int)con->in_reply.tag,
931 le32_to_cpu(con->in_reply.connect_seq),
932 le32_to_cpu(con->in_reply.global_seq));
939 * Verify the hello banner looks okay.
941 static int verify_hello(struct ceph_connection *con)
943 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
944 pr_err("connect to %s got bad banner\n",
945 pr_addr(&con->peer_addr.in_addr));
946 con->error_msg = "protocol error, bad banner";
952 static bool addr_is_blank(struct sockaddr_storage *ss)
954 switch (ss->ss_family) {
956 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
959 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
960 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
961 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
962 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
967 static int addr_port(struct sockaddr_storage *ss)
969 switch (ss->ss_family) {
971 return ntohs(((struct sockaddr_in *)ss)->sin_port);
973 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
978 static void addr_set_port(struct sockaddr_storage *ss, int p)
980 switch (ss->ss_family) {
982 ((struct sockaddr_in *)ss)->sin_port = htons(p);
984 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
989 * Parse an ip[:port] list into an addr array. Use the default
990 * monitor port if a port isn't specified.
992 int ceph_parse_ips(const char *c, const char *end,
993 struct ceph_entity_addr *addr,
994 int max_count, int *count)
999 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
1000 for (i = 0; i < max_count; i++) {
1002 struct sockaddr_storage *ss = &addr[i].in_addr;
1003 struct sockaddr_in *in4 = (void *)ss;
1004 struct sockaddr_in6 *in6 = (void *)ss;
1007 memset(ss, 0, sizeof(*ss));
1008 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
1010 ss->ss_family = AF_INET;
1011 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
1013 ss->ss_family = AF_INET6;
1020 if (p < end && *p == ':') {
1023 while (p < end && *p >= '0' && *p <= '9') {
1024 port = (port * 10) + (*p - '0');
1027 if (port > 65535 || port == 0)
1030 port = CEPH_MON_PORT;
1033 addr_set_port(ss, port);
1035 dout("parse_ips got %s\n", pr_addr(ss));
1052 pr_err("parse_ips bad ip '%s'\n", c);
1056 static int process_banner(struct ceph_connection *con)
1058 dout("process_banner on %p\n", con);
1060 if (verify_hello(con) < 0)
1063 ceph_decode_addr(&con->actual_peer_addr);
1064 ceph_decode_addr(&con->peer_addr_for_me);
1067 * Make sure the other end is who we wanted. note that the other
1068 * end may not yet know their ip address, so if it's 0.0.0.0, give
1069 * them the benefit of the doubt.
1071 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1072 sizeof(con->peer_addr)) != 0 &&
1073 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1074 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1075 pr_warning("wrong peer, want %s/%lld, got %s/%lld\n",
1076 pr_addr(&con->peer_addr.in_addr),
1077 le64_to_cpu(con->peer_addr.nonce),
1078 pr_addr(&con->actual_peer_addr.in_addr),
1079 le64_to_cpu(con->actual_peer_addr.nonce));
1080 con->error_msg = "wrong peer at address";
1085 * did we learn our address?
1087 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1088 int port = addr_port(&con->msgr->inst.addr.in_addr);
1090 memcpy(&con->msgr->inst.addr.in_addr,
1091 &con->peer_addr_for_me.in_addr,
1092 sizeof(con->peer_addr_for_me.in_addr));
1093 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1094 encode_my_addr(con->msgr);
1095 dout("process_banner learned my addr is %s\n",
1096 pr_addr(&con->msgr->inst.addr.in_addr));
1099 set_bit(NEGOTIATING, &con->state);
1100 prepare_read_connect(con);
1104 static void fail_protocol(struct ceph_connection *con)
1106 reset_connection(con);
1107 set_bit(CLOSED, &con->state); /* in case there's queued work */
1109 mutex_unlock(&con->mutex);
1110 if (con->ops->bad_proto)
1111 con->ops->bad_proto(con);
1112 mutex_lock(&con->mutex);
1115 static int process_connect(struct ceph_connection *con)
1117 u64 sup_feat = CEPH_FEATURE_SUPPORTED_CLIENT;
1118 u64 req_feat = CEPH_FEATURE_REQUIRED_CLIENT;
1119 u64 server_feat = le64_to_cpu(con->in_reply.features);
1121 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1123 switch (con->in_reply.tag) {
1124 case CEPH_MSGR_TAG_FEATURES:
1125 pr_err("%s%lld %s feature set mismatch,"
1126 " my %llx < server's %llx, missing %llx\n",
1127 ENTITY_NAME(con->peer_name),
1128 pr_addr(&con->peer_addr.in_addr),
1129 sup_feat, server_feat, server_feat & ~sup_feat);
1130 con->error_msg = "missing required protocol features";
1134 case CEPH_MSGR_TAG_BADPROTOVER:
1135 pr_err("%s%lld %s protocol version mismatch,"
1136 " my %d != server's %d\n",
1137 ENTITY_NAME(con->peer_name),
1138 pr_addr(&con->peer_addr.in_addr),
1139 le32_to_cpu(con->out_connect.protocol_version),
1140 le32_to_cpu(con->in_reply.protocol_version));
1141 con->error_msg = "protocol version mismatch";
1145 case CEPH_MSGR_TAG_BADAUTHORIZER:
1147 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1149 if (con->auth_retry == 2) {
1150 con->error_msg = "connect authorization failure";
1151 reset_connection(con);
1152 set_bit(CLOSED, &con->state);
1155 con->auth_retry = 1;
1156 prepare_write_connect(con->msgr, con, 0);
1157 prepare_read_connect(con);
1160 case CEPH_MSGR_TAG_RESETSESSION:
1162 * If we connected with a large connect_seq but the peer
1163 * has no record of a session with us (no connection, or
1164 * connect_seq == 0), they will send RESETSESION to indicate
1165 * that they must have reset their session, and may have
1168 dout("process_connect got RESET peer seq %u\n",
1169 le32_to_cpu(con->in_connect.connect_seq));
1170 pr_err("%s%lld %s connection reset\n",
1171 ENTITY_NAME(con->peer_name),
1172 pr_addr(&con->peer_addr.in_addr));
1173 reset_connection(con);
1174 prepare_write_connect(con->msgr, con, 0);
1175 prepare_read_connect(con);
1177 /* Tell ceph about it. */
1178 mutex_unlock(&con->mutex);
1179 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1180 if (con->ops->peer_reset)
1181 con->ops->peer_reset(con);
1182 mutex_lock(&con->mutex);
1185 case CEPH_MSGR_TAG_RETRY_SESSION:
1187 * If we sent a smaller connect_seq than the peer has, try
1188 * again with a larger value.
1190 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1191 le32_to_cpu(con->out_connect.connect_seq),
1192 le32_to_cpu(con->in_connect.connect_seq));
1193 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1194 prepare_write_connect(con->msgr, con, 0);
1195 prepare_read_connect(con);
1198 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1200 * If we sent a smaller global_seq than the peer has, try
1201 * again with a larger value.
1203 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1204 con->peer_global_seq,
1205 le32_to_cpu(con->in_connect.global_seq));
1206 get_global_seq(con->msgr,
1207 le32_to_cpu(con->in_connect.global_seq));
1208 prepare_write_connect(con->msgr, con, 0);
1209 prepare_read_connect(con);
1212 case CEPH_MSGR_TAG_READY:
1213 if (req_feat & ~server_feat) {
1214 pr_err("%s%lld %s protocol feature mismatch,"
1215 " my required %llx > server's %llx, need %llx\n",
1216 ENTITY_NAME(con->peer_name),
1217 pr_addr(&con->peer_addr.in_addr),
1218 req_feat, server_feat, req_feat & ~server_feat);
1219 con->error_msg = "missing required protocol features";
1223 clear_bit(CONNECTING, &con->state);
1224 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1226 con->peer_features = server_feat;
1227 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1228 con->peer_global_seq,
1229 le32_to_cpu(con->in_reply.connect_seq),
1231 WARN_ON(con->connect_seq !=
1232 le32_to_cpu(con->in_reply.connect_seq));
1234 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1235 set_bit(LOSSYTX, &con->state);
1237 prepare_read_tag(con);
1240 case CEPH_MSGR_TAG_WAIT:
1242 * If there is a connection race (we are opening
1243 * connections to each other), one of us may just have
1244 * to WAIT. This shouldn't happen if we are the
1247 pr_err("process_connect peer connecting WAIT\n");
1250 pr_err("connect protocol error, will retry\n");
1251 con->error_msg = "protocol error, garbage tag during connect";
1259 * read (part of) an ack
1261 static int read_partial_ack(struct ceph_connection *con)
1265 return read_partial(con, &to, sizeof(con->in_temp_ack),
1271 * We can finally discard anything that's been acked.
1273 static void process_ack(struct ceph_connection *con)
1276 u64 ack = le64_to_cpu(con->in_temp_ack);
1279 while (!list_empty(&con->out_sent)) {
1280 m = list_first_entry(&con->out_sent, struct ceph_msg,
1282 seq = le64_to_cpu(m->hdr.seq);
1285 dout("got ack for seq %llu type %d at %p\n", seq,
1286 le16_to_cpu(m->hdr.type), m);
1289 prepare_read_tag(con);
1295 static int read_partial_message_section(struct ceph_connection *con,
1296 struct kvec *section, unsigned int sec_len,
1304 while (section->iov_len < sec_len) {
1305 BUG_ON(section->iov_base == NULL);
1306 left = sec_len - section->iov_len;
1307 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1308 section->iov_len, left);
1311 section->iov_len += ret;
1312 if (section->iov_len == sec_len)
1313 *crc = crc32c(0, section->iov_base,
1320 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1321 struct ceph_msg_header *hdr,
1324 * read (part of) a message.
1326 static int read_partial_message(struct ceph_connection *con)
1328 struct ceph_msg *m = con->in_msg;
1332 unsigned front_len, middle_len, data_len, data_off;
1333 int datacrc = con->msgr->nocrc;
1337 dout("read_partial_message con %p msg %p\n", con, m);
1340 while (con->in_base_pos < sizeof(con->in_hdr)) {
1341 left = sizeof(con->in_hdr) - con->in_base_pos;
1342 ret = ceph_tcp_recvmsg(con->sock,
1343 (char *)&con->in_hdr + con->in_base_pos,
1347 con->in_base_pos += ret;
1348 if (con->in_base_pos == sizeof(con->in_hdr)) {
1349 u32 crc = crc32c(0, (void *)&con->in_hdr,
1350 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1351 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1352 pr_err("read_partial_message bad hdr "
1353 " crc %u != expected %u\n",
1354 crc, con->in_hdr.crc);
1359 front_len = le32_to_cpu(con->in_hdr.front_len);
1360 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1362 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1363 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1365 data_len = le32_to_cpu(con->in_hdr.data_len);
1366 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1368 data_off = le16_to_cpu(con->in_hdr.data_off);
1371 seq = le64_to_cpu(con->in_hdr.seq);
1372 if ((s64)seq - (s64)con->in_seq < 1) {
1373 pr_info("skipping %s%lld %s seq %lld, expected %lld\n",
1374 ENTITY_NAME(con->peer_name),
1375 pr_addr(&con->peer_addr.in_addr),
1376 seq, con->in_seq + 1);
1377 con->in_base_pos = -front_len - middle_len - data_len -
1379 con->in_tag = CEPH_MSGR_TAG_READY;
1382 } else if ((s64)seq - (s64)con->in_seq > 1) {
1383 pr_err("read_partial_message bad seq %lld expected %lld\n",
1384 seq, con->in_seq + 1);
1385 con->error_msg = "bad message sequence # for incoming message";
1389 /* allocate message? */
1391 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1392 con->in_hdr.front_len, con->in_hdr.data_len);
1393 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1395 /* skip this message */
1396 dout("alloc_msg said skip message\n");
1397 con->in_base_pos = -front_len - middle_len - data_len -
1399 con->in_tag = CEPH_MSGR_TAG_READY;
1405 "error allocating memory for incoming message";
1409 m->front.iov_len = 0; /* haven't read it yet */
1411 m->middle->vec.iov_len = 0;
1413 con->in_msg_pos.page = 0;
1414 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1415 con->in_msg_pos.data_pos = 0;
1419 ret = read_partial_message_section(con, &m->front, front_len,
1420 &con->in_front_crc);
1426 ret = read_partial_message_section(con, &m->middle->vec, middle_len,
1427 &con->in_middle_crc);
1433 while (con->in_msg_pos.data_pos < data_len) {
1434 left = min((int)(data_len - con->in_msg_pos.data_pos),
1435 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1436 BUG_ON(m->pages == NULL);
1437 p = kmap(m->pages[con->in_msg_pos.page]);
1438 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1440 if (ret > 0 && datacrc)
1442 crc32c(con->in_data_crc,
1443 p + con->in_msg_pos.page_pos, ret);
1444 kunmap(m->pages[con->in_msg_pos.page]);
1447 con->in_msg_pos.data_pos += ret;
1448 con->in_msg_pos.page_pos += ret;
1449 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1450 con->in_msg_pos.page_pos = 0;
1451 con->in_msg_pos.page++;
1456 to = sizeof(m->hdr) + sizeof(m->footer);
1457 while (con->in_base_pos < to) {
1458 left = to - con->in_base_pos;
1459 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1460 (con->in_base_pos - sizeof(m->hdr)),
1464 con->in_base_pos += ret;
1466 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1467 m, front_len, m->footer.front_crc, middle_len,
1468 m->footer.middle_crc, data_len, m->footer.data_crc);
1471 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1472 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1473 m, con->in_front_crc, m->footer.front_crc);
1476 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1477 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1478 m, con->in_middle_crc, m->footer.middle_crc);
1482 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1483 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1484 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1485 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1489 return 1; /* done! */
1493 * Process message. This happens in the worker thread. The callback should
1494 * be careful not to do anything that waits on other incoming messages or it
1497 static void process_message(struct ceph_connection *con)
1499 struct ceph_msg *msg;
1504 /* if first message, set peer_name */
1505 if (con->peer_name.type == 0)
1506 con->peer_name = msg->hdr.src;
1509 mutex_unlock(&con->mutex);
1511 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1512 msg, le64_to_cpu(msg->hdr.seq),
1513 ENTITY_NAME(msg->hdr.src),
1514 le16_to_cpu(msg->hdr.type),
1515 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1516 le32_to_cpu(msg->hdr.front_len),
1517 le32_to_cpu(msg->hdr.data_len),
1518 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1519 con->ops->dispatch(con, msg);
1521 mutex_lock(&con->mutex);
1522 prepare_read_tag(con);
1527 * Write something to the socket. Called in a worker thread when the
1528 * socket appears to be writeable and we have something ready to send.
1530 static int try_write(struct ceph_connection *con)
1532 struct ceph_messenger *msgr = con->msgr;
1535 dout("try_write start %p state %lu nref %d\n", con, con->state,
1536 atomic_read(&con->nref));
1539 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1541 /* open the socket first? */
1542 if (con->sock == NULL) {
1544 * if we were STANDBY and are reconnecting _this_
1545 * connection, bump connect_seq now. Always bump
1548 if (test_and_clear_bit(STANDBY, &con->state))
1551 prepare_write_banner(msgr, con);
1552 prepare_write_connect(msgr, con, 1);
1553 prepare_read_banner(con);
1554 set_bit(CONNECTING, &con->state);
1555 clear_bit(NEGOTIATING, &con->state);
1557 BUG_ON(con->in_msg);
1558 con->in_tag = CEPH_MSGR_TAG_READY;
1559 dout("try_write initiating connect on %p new state %lu\n",
1561 con->sock = ceph_tcp_connect(con);
1562 if (IS_ERR(con->sock)) {
1564 con->error_msg = "connect error";
1571 /* kvec data queued? */
1572 if (con->out_skip) {
1573 ret = write_partial_skip(con);
1577 dout("try_write write_partial_skip err %d\n", ret);
1581 if (con->out_kvec_left) {
1582 ret = write_partial_kvec(con);
1589 if (con->out_msg_done) {
1590 ceph_msg_put(con->out_msg);
1591 con->out_msg = NULL; /* we're done with this one */
1595 ret = write_partial_msg_pages(con);
1597 goto more_kvec; /* we need to send the footer, too! */
1601 dout("try_write write_partial_msg_pages err %d\n",
1608 if (!test_bit(CONNECTING, &con->state)) {
1609 /* is anything else pending? */
1610 if (!list_empty(&con->out_queue)) {
1611 prepare_write_message(con);
1614 if (con->in_seq > con->in_seq_acked) {
1615 prepare_write_ack(con);
1618 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1619 prepare_write_keepalive(con);
1624 /* Nothing to do! */
1625 clear_bit(WRITE_PENDING, &con->state);
1626 dout("try_write nothing else to write.\n");
1630 dout("try_write done on %p\n", con);
1637 * Read what we can from the socket.
1639 static int try_read(struct ceph_connection *con)
1646 if (test_bit(STANDBY, &con->state))
1649 dout("try_read start on %p\n", con);
1652 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1654 if (test_bit(CONNECTING, &con->state)) {
1655 if (!test_bit(NEGOTIATING, &con->state)) {
1656 dout("try_read connecting\n");
1657 ret = read_partial_banner(con);
1660 if (process_banner(con) < 0) {
1665 ret = read_partial_connect(con);
1668 if (process_connect(con) < 0) {
1675 if (con->in_base_pos < 0) {
1677 * skipping + discarding content.
1679 * FIXME: there must be a better way to do this!
1681 static char buf[1024];
1682 int skip = min(1024, -con->in_base_pos);
1683 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1684 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1687 con->in_base_pos += ret;
1688 if (con->in_base_pos)
1691 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1695 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1698 dout("try_read got tag %d\n", (int)con->in_tag);
1699 switch (con->in_tag) {
1700 case CEPH_MSGR_TAG_MSG:
1701 prepare_read_message(con);
1703 case CEPH_MSGR_TAG_ACK:
1704 prepare_read_ack(con);
1706 case CEPH_MSGR_TAG_CLOSE:
1707 set_bit(CLOSED, &con->state); /* fixme */
1713 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1714 ret = read_partial_message(con);
1718 con->error_msg = "bad crc";
1722 con->error_msg = "io error";
1728 if (con->in_tag == CEPH_MSGR_TAG_READY)
1730 process_message(con);
1733 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1734 ret = read_partial_ack(con);
1744 dout("try_read done on %p\n", con);
1748 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1749 con->error_msg = "protocol error, garbage tag";
1756 * Atomically queue work on a connection. Bump @con reference to
1757 * avoid races with connection teardown.
1759 * There is some trickery going on with QUEUED and BUSY because we
1760 * only want a _single_ thread operating on each connection at any
1761 * point in time, but we want to use all available CPUs.
1763 * The worker thread only proceeds if it can atomically set BUSY. It
1764 * clears QUEUED and does it's thing. When it thinks it's done, it
1765 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1766 * (tries again to set BUSY).
1768 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1769 * try to queue work. If that fails (work is already queued, or BUSY)
1770 * we give up (work also already being done or is queued) but leave QUEUED
1771 * set so that the worker thread will loop if necessary.
1773 static void queue_con(struct ceph_connection *con)
1775 if (test_bit(DEAD, &con->state)) {
1776 dout("queue_con %p ignoring: DEAD\n",
1781 if (!con->ops->get(con)) {
1782 dout("queue_con %p ref count 0\n", con);
1786 set_bit(QUEUED, &con->state);
1787 if (test_bit(BUSY, &con->state)) {
1788 dout("queue_con %p - already BUSY\n", con);
1790 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1791 dout("queue_con %p - already queued\n", con);
1794 dout("queue_con %p\n", con);
1799 * Do some work on a connection. Drop a connection ref when we're done.
1801 static void con_work(struct work_struct *work)
1803 struct ceph_connection *con = container_of(work, struct ceph_connection,
1808 if (test_and_set_bit(BUSY, &con->state) != 0) {
1809 dout("con_work %p BUSY already set\n", con);
1812 dout("con_work %p start, clearing QUEUED\n", con);
1813 clear_bit(QUEUED, &con->state);
1815 mutex_lock(&con->mutex);
1817 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1818 dout("con_work CLOSED\n");
1819 con_close_socket(con);
1822 if (test_and_clear_bit(OPENING, &con->state)) {
1823 /* reopen w/ new peer */
1824 dout("con_work OPENING\n");
1825 con_close_socket(con);
1828 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1829 try_read(con) < 0 ||
1830 try_write(con) < 0) {
1831 mutex_unlock(&con->mutex);
1833 ceph_fault(con); /* error/fault path */
1838 mutex_unlock(&con->mutex);
1841 clear_bit(BUSY, &con->state);
1842 dout("con->state=%lu\n", con->state);
1843 if (test_bit(QUEUED, &con->state)) {
1844 if (!backoff || test_bit(OPENING, &con->state)) {
1845 dout("con_work %p QUEUED reset, looping\n", con);
1848 dout("con_work %p QUEUED reset, but just faulted\n", con);
1849 clear_bit(QUEUED, &con->state);
1851 dout("con_work %p done\n", con);
1859 * Generic error/fault handler. A retry mechanism is used with
1860 * exponential backoff
1862 static void ceph_fault(struct ceph_connection *con)
1864 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1865 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1866 dout("fault %p state %lu to peer %s\n",
1867 con, con->state, pr_addr(&con->peer_addr.in_addr));
1869 if (test_bit(LOSSYTX, &con->state)) {
1870 dout("fault on LOSSYTX channel\n");
1874 mutex_lock(&con->mutex);
1875 if (test_bit(CLOSED, &con->state))
1878 con_close_socket(con);
1881 ceph_msg_put(con->in_msg);
1885 /* Requeue anything that hasn't been acked */
1886 list_splice_init(&con->out_sent, &con->out_queue);
1888 /* If there are no messages in the queue, place the connection
1889 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1890 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1891 dout("fault setting STANDBY\n");
1892 set_bit(STANDBY, &con->state);
1894 /* retry after a delay. */
1895 if (con->delay == 0)
1896 con->delay = BASE_DELAY_INTERVAL;
1897 else if (con->delay < MAX_DELAY_INTERVAL)
1899 dout("fault queueing %p delay %lu\n", con, con->delay);
1901 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1902 round_jiffies_relative(con->delay)) == 0)
1907 mutex_unlock(&con->mutex);
1910 * in case we faulted due to authentication, invalidate our
1911 * current tickets so that we can get new ones.
1913 if (con->auth_retry && con->ops->invalidate_authorizer) {
1914 dout("calling invalidate_authorizer()\n");
1915 con->ops->invalidate_authorizer(con);
1918 if (con->ops->fault)
1919 con->ops->fault(con);
1925 * create a new messenger instance
1927 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1929 struct ceph_messenger *msgr;
1931 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1933 return ERR_PTR(-ENOMEM);
1935 spin_lock_init(&msgr->global_seq_lock);
1937 /* the zero page is needed if a request is "canceled" while the message
1938 * is being written over the socket */
1939 msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
1940 if (!msgr->zero_page) {
1942 return ERR_PTR(-ENOMEM);
1944 kmap(msgr->zero_page);
1947 msgr->inst.addr = *myaddr;
1949 /* select a random nonce */
1950 msgr->inst.addr.type = 0;
1951 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
1952 encode_my_addr(msgr);
1954 dout("messenger_create %p\n", msgr);
1958 void ceph_messenger_destroy(struct ceph_messenger *msgr)
1960 dout("destroy %p\n", msgr);
1961 kunmap(msgr->zero_page);
1962 __free_page(msgr->zero_page);
1964 dout("destroyed messenger %p\n", msgr);
1968 * Queue up an outgoing message on the given connection.
1970 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1972 if (test_bit(CLOSED, &con->state)) {
1973 dout("con_send %p closed, dropping %p\n", con, msg);
1979 msg->hdr.src = con->msgr->inst.name;
1981 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
1983 msg->needs_out_seq = true;
1986 mutex_lock(&con->mutex);
1987 BUG_ON(!list_empty(&msg->list_head));
1988 list_add_tail(&msg->list_head, &con->out_queue);
1989 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
1990 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
1991 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1992 le32_to_cpu(msg->hdr.front_len),
1993 le32_to_cpu(msg->hdr.middle_len),
1994 le32_to_cpu(msg->hdr.data_len));
1995 mutex_unlock(&con->mutex);
1997 /* if there wasn't anything waiting to send before, queue
1999 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2004 * Revoke a message that was previously queued for send
2006 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
2008 mutex_lock(&con->mutex);
2009 if (!list_empty(&msg->list_head)) {
2010 dout("con_revoke %p msg %p\n", con, msg);
2011 list_del_init(&msg->list_head);
2014 if (con->out_msg == msg) {
2015 ceph_msg_put(con->out_msg);
2016 con->out_msg = NULL;
2018 if (con->out_kvec_is_msg) {
2019 con->out_skip = con->out_kvec_bytes;
2020 con->out_kvec_is_msg = false;
2023 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
2025 mutex_unlock(&con->mutex);
2029 * Revoke a message that we may be reading data into
2031 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2033 mutex_lock(&con->mutex);
2034 if (con->in_msg && con->in_msg == msg) {
2035 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2036 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2037 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2039 /* skip rest of message */
2040 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2041 con->in_base_pos = con->in_base_pos -
2042 sizeof(struct ceph_msg_header) -
2046 sizeof(struct ceph_msg_footer);
2047 ceph_msg_put(con->in_msg);
2049 con->in_tag = CEPH_MSGR_TAG_READY;
2052 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2053 con, con->in_msg, msg);
2055 mutex_unlock(&con->mutex);
2059 * Queue a keepalive byte to ensure the tcp connection is alive.
2061 void ceph_con_keepalive(struct ceph_connection *con)
2063 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2064 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2070 * construct a new message with given type, size
2071 * the new msg has a ref count of 1.
2073 struct ceph_msg *ceph_msg_new(int type, int front_len)
2077 m = kmalloc(sizeof(*m), GFP_NOFS);
2080 kref_init(&m->kref);
2081 INIT_LIST_HEAD(&m->list_head);
2084 m->hdr.type = cpu_to_le16(type);
2085 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2087 m->hdr.front_len = cpu_to_le32(front_len);
2088 m->hdr.middle_len = 0;
2089 m->hdr.data_len = 0;
2090 m->hdr.data_off = 0;
2091 m->hdr.reserved = 0;
2092 m->footer.front_crc = 0;
2093 m->footer.middle_crc = 0;
2094 m->footer.data_crc = 0;
2095 m->footer.flags = 0;
2096 m->front_max = front_len;
2097 m->front_is_vmalloc = false;
2098 m->more_to_follow = false;
2103 if (front_len > PAGE_CACHE_SIZE) {
2104 m->front.iov_base = __vmalloc(front_len, GFP_NOFS,
2106 m->front_is_vmalloc = true;
2108 m->front.iov_base = kmalloc(front_len, GFP_NOFS);
2110 if (m->front.iov_base == NULL) {
2111 pr_err("msg_new can't allocate %d bytes\n",
2116 m->front.iov_base = NULL;
2118 m->front.iov_len = front_len;
2128 dout("ceph_msg_new %p front %d\n", m, front_len);
2134 pr_err("msg_new can't create type %d front %d\n", type, front_len);
2139 * Allocate "middle" portion of a message, if it is needed and wasn't
2140 * allocated by alloc_msg. This allows us to read a small fixed-size
2141 * per-type header in the front and then gracefully fail (i.e.,
2142 * propagate the error to the caller based on info in the front) when
2143 * the middle is too large.
2145 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2147 int type = le16_to_cpu(msg->hdr.type);
2148 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2150 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2151 ceph_msg_type_name(type), middle_len);
2152 BUG_ON(!middle_len);
2153 BUG_ON(msg->middle);
2155 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2162 * Generic message allocator, for incoming messages.
2164 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2165 struct ceph_msg_header *hdr,
2168 int type = le16_to_cpu(hdr->type);
2169 int front_len = le32_to_cpu(hdr->front_len);
2170 int middle_len = le32_to_cpu(hdr->middle_len);
2171 struct ceph_msg *msg = NULL;
2174 if (con->ops->alloc_msg) {
2175 mutex_unlock(&con->mutex);
2176 msg = con->ops->alloc_msg(con, hdr, skip);
2177 mutex_lock(&con->mutex);
2183 msg = ceph_msg_new(type, front_len);
2185 pr_err("unable to allocate msg type %d len %d\n",
2190 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2192 if (middle_len && !msg->middle) {
2193 ret = ceph_alloc_middle(con, msg);
2205 * Free a generically kmalloc'd message.
2207 void ceph_msg_kfree(struct ceph_msg *m)
2209 dout("msg_kfree %p\n", m);
2210 if (m->front_is_vmalloc)
2211 vfree(m->front.iov_base);
2213 kfree(m->front.iov_base);
2218 * Drop a msg ref. Destroy as needed.
2220 void ceph_msg_last_put(struct kref *kref)
2222 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2224 dout("ceph_msg_put last one on %p\n", m);
2225 WARN_ON(!list_empty(&m->list_head));
2227 /* drop middle, data, if any */
2229 ceph_buffer_put(m->middle);
2236 ceph_pagelist_release(m->pagelist);
2242 ceph_msgpool_put(m->pool, m);
2247 void ceph_msg_dump(struct ceph_msg *msg)
2249 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2250 msg->front_max, msg->nr_pages);
2251 print_hex_dump(KERN_DEBUG, "header: ",
2252 DUMP_PREFIX_OFFSET, 16, 1,
2253 &msg->hdr, sizeof(msg->hdr), true);
2254 print_hex_dump(KERN_DEBUG, " front: ",
2255 DUMP_PREFIX_OFFSET, 16, 1,
2256 msg->front.iov_base, msg->front.iov_len, true);
2258 print_hex_dump(KERN_DEBUG, "middle: ",
2259 DUMP_PREFIX_OFFSET, 16, 1,
2260 msg->middle->vec.iov_base,
2261 msg->middle->vec.iov_len, true);
2262 print_hex_dump(KERN_DEBUG, "footer: ",
2263 DUMP_PREFIX_OFFSET, 16, 1,
2264 &msg->footer, sizeof(msg->footer), true);