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"
19 * Ceph uses the messenger to exchange ceph_msg messages with other
20 * hosts in the system. The messenger provides ordered and reliable
21 * delivery. We tolerate TCP disconnects by reconnecting (with
22 * exponential backoff) in the case of a fault (disconnection, bad
23 * crc, protocol error). Acks allow sent messages to be discarded by
27 /* static tag bytes (protocol control messages) */
28 static char tag_msg = CEPH_MSGR_TAG_MSG;
29 static char tag_ack = CEPH_MSGR_TAG_ACK;
30 static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
33 static void queue_con(struct ceph_connection *con);
34 static void con_work(struct work_struct *);
35 static void ceph_fault(struct ceph_connection *con);
37 const char *ceph_name_type_str(int t)
40 case CEPH_ENTITY_TYPE_MON: return "mon";
41 case CEPH_ENTITY_TYPE_MDS: return "mds";
42 case CEPH_ENTITY_TYPE_OSD: return "osd";
43 case CEPH_ENTITY_TYPE_CLIENT: return "client";
44 case CEPH_ENTITY_TYPE_ADMIN: return "admin";
45 default: return "???";
50 * nicely render a sockaddr as a string.
52 #define MAX_ADDR_STR 20
53 static char addr_str[MAX_ADDR_STR][40];
54 static DEFINE_SPINLOCK(addr_str_lock);
55 static int last_addr_str;
57 const char *pr_addr(const struct sockaddr_storage *ss)
61 struct sockaddr_in *in4 = (void *)ss;
62 unsigned char *quad = (void *)&in4->sin_addr.s_addr;
63 struct sockaddr_in6 *in6 = (void *)ss;
65 spin_lock(&addr_str_lock);
67 if (last_addr_str == MAX_ADDR_STR)
69 spin_unlock(&addr_str_lock);
72 switch (ss->ss_family) {
74 sprintf(s, "%u.%u.%u.%u:%u",
75 (unsigned int)quad[0],
76 (unsigned int)quad[1],
77 (unsigned int)quad[2],
78 (unsigned int)quad[3],
79 (unsigned int)ntohs(in4->sin_port));
83 sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
84 in6->sin6_addr.s6_addr16[0],
85 in6->sin6_addr.s6_addr16[1],
86 in6->sin6_addr.s6_addr16[2],
87 in6->sin6_addr.s6_addr16[3],
88 in6->sin6_addr.s6_addr16[4],
89 in6->sin6_addr.s6_addr16[5],
90 in6->sin6_addr.s6_addr16[6],
91 in6->sin6_addr.s6_addr16[7],
92 (unsigned int)ntohs(in6->sin6_port));
96 sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
102 static void encode_my_addr(struct ceph_messenger *msgr)
104 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
105 ceph_encode_addr(&msgr->my_enc_addr);
109 * work queue for all reading and writing to/from the socket.
111 struct workqueue_struct *ceph_msgr_wq;
113 int __init ceph_msgr_init(void)
115 ceph_msgr_wq = create_workqueue("ceph-msgr");
116 if (IS_ERR(ceph_msgr_wq)) {
117 int ret = PTR_ERR(ceph_msgr_wq);
118 pr_err("msgr_init failed to create workqueue: %d\n", ret);
125 void ceph_msgr_exit(void)
127 destroy_workqueue(ceph_msgr_wq);
131 * socket callback functions
134 /* data available on socket, or listen socket received a connect */
135 static void ceph_data_ready(struct sock *sk, int count_unused)
137 struct ceph_connection *con =
138 (struct ceph_connection *)sk->sk_user_data;
139 if (sk->sk_state != TCP_CLOSE_WAIT) {
140 dout("ceph_data_ready on %p state = %lu, queueing work\n",
146 /* socket has buffer space for writing */
147 static void ceph_write_space(struct sock *sk)
149 struct ceph_connection *con =
150 (struct ceph_connection *)sk->sk_user_data;
152 /* only queue to workqueue if there is data we want to write. */
153 if (test_bit(WRITE_PENDING, &con->state)) {
154 dout("ceph_write_space %p queueing write work\n", con);
157 dout("ceph_write_space %p nothing to write\n", con);
160 /* since we have our own write_space, clear the SOCK_NOSPACE flag */
161 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
164 /* socket's state has changed */
165 static void ceph_state_change(struct sock *sk)
167 struct ceph_connection *con =
168 (struct ceph_connection *)sk->sk_user_data;
170 dout("ceph_state_change %p state = %lu sk_state = %u\n",
171 con, con->state, sk->sk_state);
173 if (test_bit(CLOSED, &con->state))
176 switch (sk->sk_state) {
178 dout("ceph_state_change TCP_CLOSE\n");
180 dout("ceph_state_change TCP_CLOSE_WAIT\n");
181 if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
182 if (test_bit(CONNECTING, &con->state))
183 con->error_msg = "connection failed";
185 con->error_msg = "socket closed";
189 case TCP_ESTABLISHED:
190 dout("ceph_state_change TCP_ESTABLISHED\n");
197 * set up socket callbacks
199 static void set_sock_callbacks(struct socket *sock,
200 struct ceph_connection *con)
202 struct sock *sk = sock->sk;
203 sk->sk_user_data = (void *)con;
204 sk->sk_data_ready = ceph_data_ready;
205 sk->sk_write_space = ceph_write_space;
206 sk->sk_state_change = ceph_state_change;
215 * initiate connection to a remote socket.
217 static struct socket *ceph_tcp_connect(struct ceph_connection *con)
219 struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
224 ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
228 sock->sk->sk_allocation = GFP_NOFS;
230 set_sock_callbacks(sock, con);
232 dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
234 ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
235 if (ret == -EINPROGRESS) {
236 dout("connect %s EINPROGRESS sk_state = %u\n",
237 pr_addr(&con->peer_addr.in_addr),
242 pr_err("connect %s error %d\n",
243 pr_addr(&con->peer_addr.in_addr), ret);
246 con->error_msg = "connect error";
254 static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
256 struct kvec iov = {buf, len};
257 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
259 return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
263 * write something. @more is true if caller will be sending more data
266 static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
267 size_t kvlen, size_t len, int more)
269 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
272 msg.msg_flags |= MSG_MORE;
274 msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
276 return kernel_sendmsg(sock, &msg, iov, kvlen, len);
281 * Shutdown/close the socket for the given connection.
283 static int con_close_socket(struct ceph_connection *con)
287 dout("con_close_socket on %p sock %p\n", con, con->sock);
290 set_bit(SOCK_CLOSED, &con->state);
291 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
292 sock_release(con->sock);
294 clear_bit(SOCK_CLOSED, &con->state);
299 * Reset a connection. Discard all incoming and outgoing messages
300 * and clear *_seq state.
302 static void ceph_msg_remove(struct ceph_msg *msg)
304 list_del_init(&msg->list_head);
307 static void ceph_msg_remove_list(struct list_head *head)
309 while (!list_empty(head)) {
310 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
312 ceph_msg_remove(msg);
316 static void reset_connection(struct ceph_connection *con)
318 /* reset connection, out_queue, msg_ and connect_seq */
319 /* discard existing out_queue and msg_seq */
320 ceph_msg_remove_list(&con->out_queue);
321 ceph_msg_remove_list(&con->out_sent);
324 ceph_msg_put(con->in_msg);
328 con->connect_seq = 0;
331 ceph_msg_put(con->out_msg);
338 * mark a peer down. drop any open connections.
340 void ceph_con_close(struct ceph_connection *con)
342 dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
343 set_bit(CLOSED, &con->state); /* in case there's queued work */
344 clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
345 clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
346 clear_bit(KEEPALIVE_PENDING, &con->state);
347 clear_bit(WRITE_PENDING, &con->state);
348 mutex_lock(&con->mutex);
349 reset_connection(con);
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 */
371 struct ceph_connection *ceph_con_get(struct ceph_connection *con)
373 dout("con_get %p nref = %d -> %d\n", con,
374 atomic_read(&con->nref), atomic_read(&con->nref) + 1);
375 if (atomic_inc_not_zero(&con->nref))
380 void ceph_con_put(struct ceph_connection *con)
382 dout("con_put %p nref = %d -> %d\n", con,
383 atomic_read(&con->nref), atomic_read(&con->nref) - 1);
384 BUG_ON(atomic_read(&con->nref) == 0);
385 if (atomic_dec_and_test(&con->nref)) {
392 * initialize a new connection.
394 void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
396 dout("con_init %p\n", con);
397 memset(con, 0, sizeof(*con));
398 atomic_set(&con->nref, 1);
400 mutex_init(&con->mutex);
401 INIT_LIST_HEAD(&con->out_queue);
402 INIT_LIST_HEAD(&con->out_sent);
403 INIT_DELAYED_WORK(&con->work, con_work);
408 * We maintain a global counter to order connection attempts. Get
409 * a unique seq greater than @gt.
411 static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
415 spin_lock(&msgr->global_seq_lock);
416 if (msgr->global_seq < gt)
417 msgr->global_seq = gt;
418 ret = ++msgr->global_seq;
419 spin_unlock(&msgr->global_seq_lock);
425 * Prepare footer for currently outgoing message, and finish things
426 * off. Assumes out_kvec* are already valid.. we just add on to the end.
428 static void prepare_write_message_footer(struct ceph_connection *con, int v)
430 struct ceph_msg *m = con->out_msg;
432 dout("prepare_write_message_footer %p\n", con);
433 con->out_kvec_is_msg = true;
434 con->out_kvec[v].iov_base = &m->footer;
435 con->out_kvec[v].iov_len = sizeof(m->footer);
436 con->out_kvec_bytes += sizeof(m->footer);
437 con->out_kvec_left++;
438 con->out_more = m->more_to_follow;
439 con->out_msg_done = true;
443 * Prepare headers for the next outgoing message.
445 static void prepare_write_message(struct ceph_connection *con)
450 con->out_kvec_bytes = 0;
451 con->out_kvec_is_msg = true;
452 con->out_msg_done = false;
454 /* Sneak an ack in there first? If we can get it into the same
455 * TCP packet that's a good thing. */
456 if (con->in_seq > con->in_seq_acked) {
457 con->in_seq_acked = con->in_seq;
458 con->out_kvec[v].iov_base = &tag_ack;
459 con->out_kvec[v++].iov_len = 1;
460 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
461 con->out_kvec[v].iov_base = &con->out_temp_ack;
462 con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
463 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
466 m = list_first_entry(&con->out_queue,
467 struct ceph_msg, list_head);
469 if (test_bit(LOSSYTX, &con->state)) {
470 list_del_init(&m->list_head);
472 /* put message on sent list */
474 list_move_tail(&m->list_head, &con->out_sent);
477 m->hdr.seq = cpu_to_le64(++con->out_seq);
479 dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
480 m, con->out_seq, le16_to_cpu(m->hdr.type),
481 le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
482 le32_to_cpu(m->hdr.data_len),
484 BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
486 /* tag + hdr + front + middle */
487 con->out_kvec[v].iov_base = &tag_msg;
488 con->out_kvec[v++].iov_len = 1;
489 con->out_kvec[v].iov_base = &m->hdr;
490 con->out_kvec[v++].iov_len = sizeof(m->hdr);
491 con->out_kvec[v++] = m->front;
493 con->out_kvec[v++] = m->middle->vec;
494 con->out_kvec_left = v;
495 con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
496 (m->middle ? m->middle->vec.iov_len : 0);
497 con->out_kvec_cur = con->out_kvec;
499 /* fill in crc (except data pages), footer */
500 con->out_msg->hdr.crc =
501 cpu_to_le32(crc32c(0, (void *)&m->hdr,
502 sizeof(m->hdr) - sizeof(m->hdr.crc)));
503 con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
504 con->out_msg->footer.front_crc =
505 cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
507 con->out_msg->footer.middle_crc =
508 cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
509 m->middle->vec.iov_len));
511 con->out_msg->footer.middle_crc = 0;
512 con->out_msg->footer.data_crc = 0;
513 dout("prepare_write_message front_crc %u data_crc %u\n",
514 le32_to_cpu(con->out_msg->footer.front_crc),
515 le32_to_cpu(con->out_msg->footer.middle_crc));
517 /* is there a data payload? */
518 if (le32_to_cpu(m->hdr.data_len) > 0) {
519 /* initialize page iterator */
520 con->out_msg_pos.page = 0;
521 con->out_msg_pos.page_pos =
522 le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
523 con->out_msg_pos.data_pos = 0;
524 con->out_msg_pos.did_page_crc = 0;
525 con->out_more = 1; /* data + footer will follow */
527 /* no, queue up footer too and be done */
528 prepare_write_message_footer(con, v);
531 set_bit(WRITE_PENDING, &con->state);
537 static void prepare_write_ack(struct ceph_connection *con)
539 dout("prepare_write_ack %p %llu -> %llu\n", con,
540 con->in_seq_acked, con->in_seq);
541 con->in_seq_acked = con->in_seq;
543 con->out_kvec[0].iov_base = &tag_ack;
544 con->out_kvec[0].iov_len = 1;
545 con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
546 con->out_kvec[1].iov_base = &con->out_temp_ack;
547 con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
548 con->out_kvec_left = 2;
549 con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
550 con->out_kvec_cur = con->out_kvec;
551 con->out_more = 1; /* more will follow.. eventually.. */
552 set_bit(WRITE_PENDING, &con->state);
556 * Prepare to write keepalive byte.
558 static void prepare_write_keepalive(struct ceph_connection *con)
560 dout("prepare_write_keepalive %p\n", con);
561 con->out_kvec[0].iov_base = &tag_keepalive;
562 con->out_kvec[0].iov_len = 1;
563 con->out_kvec_left = 1;
564 con->out_kvec_bytes = 1;
565 con->out_kvec_cur = con->out_kvec;
566 set_bit(WRITE_PENDING, &con->state);
570 * Connection negotiation.
573 static void prepare_connect_authorizer(struct ceph_connection *con)
577 int auth_protocol = 0;
579 mutex_unlock(&con->mutex);
580 if (con->ops->get_authorizer)
581 con->ops->get_authorizer(con, &auth_buf, &auth_len,
582 &auth_protocol, &con->auth_reply_buf,
583 &con->auth_reply_buf_len,
585 mutex_lock(&con->mutex);
587 con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
588 con->out_connect.authorizer_len = cpu_to_le32(auth_len);
590 con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
591 con->out_kvec[con->out_kvec_left].iov_len = auth_len;
592 con->out_kvec_left++;
593 con->out_kvec_bytes += auth_len;
597 * We connected to a peer and are saying hello.
599 static void prepare_write_banner(struct ceph_messenger *msgr,
600 struct ceph_connection *con)
602 int len = strlen(CEPH_BANNER);
604 con->out_kvec[0].iov_base = CEPH_BANNER;
605 con->out_kvec[0].iov_len = len;
606 con->out_kvec[1].iov_base = &msgr->my_enc_addr;
607 con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
608 con->out_kvec_left = 2;
609 con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
610 con->out_kvec_cur = con->out_kvec;
612 set_bit(WRITE_PENDING, &con->state);
615 static void prepare_write_connect(struct ceph_messenger *msgr,
616 struct ceph_connection *con,
619 unsigned global_seq = get_global_seq(con->msgr, 0);
622 switch (con->peer_name.type) {
623 case CEPH_ENTITY_TYPE_MON:
624 proto = CEPH_MONC_PROTOCOL;
626 case CEPH_ENTITY_TYPE_OSD:
627 proto = CEPH_OSDC_PROTOCOL;
629 case CEPH_ENTITY_TYPE_MDS:
630 proto = CEPH_MDSC_PROTOCOL;
636 dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
637 con->connect_seq, global_seq, proto);
639 con->out_connect.features = CEPH_FEATURE_SUPPORTED;
640 con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
641 con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
642 con->out_connect.global_seq = cpu_to_le32(global_seq);
643 con->out_connect.protocol_version = cpu_to_le32(proto);
644 con->out_connect.flags = 0;
647 con->out_kvec_left = 0;
648 con->out_kvec_bytes = 0;
650 con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
651 con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
652 con->out_kvec_left++;
653 con->out_kvec_bytes += sizeof(con->out_connect);
654 con->out_kvec_cur = con->out_kvec;
656 set_bit(WRITE_PENDING, &con->state);
658 prepare_connect_authorizer(con);
663 * write as much of pending kvecs to the socket as we can.
665 * 0 -> socket full, but more to do
668 static int write_partial_kvec(struct ceph_connection *con)
672 dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
673 while (con->out_kvec_bytes > 0) {
674 ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
675 con->out_kvec_left, con->out_kvec_bytes,
679 con->out_kvec_bytes -= ret;
680 if (con->out_kvec_bytes == 0)
683 if (ret >= con->out_kvec_cur->iov_len) {
684 ret -= con->out_kvec_cur->iov_len;
686 con->out_kvec_left--;
688 con->out_kvec_cur->iov_len -= ret;
689 con->out_kvec_cur->iov_base += ret;
695 con->out_kvec_left = 0;
696 con->out_kvec_is_msg = false;
699 dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
700 con->out_kvec_bytes, con->out_kvec_left, ret);
701 return ret; /* done! */
705 * Write as much message data payload as we can. If we finish, queue
707 * 1 -> done, footer is now queued in out_kvec[].
708 * 0 -> socket full, but more to do
711 static int write_partial_msg_pages(struct ceph_connection *con)
713 struct ceph_msg *msg = con->out_msg;
714 unsigned data_len = le32_to_cpu(msg->hdr.data_len);
716 int crc = con->msgr->nocrc;
719 dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
720 con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
721 con->out_msg_pos.page_pos);
723 while (con->out_msg_pos.page < con->out_msg->nr_pages) {
724 struct page *page = NULL;
728 * if we are calculating the data crc (the default), we need
729 * to map the page. if our pages[] has been revoked, use the
733 page = msg->pages[con->out_msg_pos.page];
736 } else if (msg->pagelist) {
737 page = list_first_entry(&msg->pagelist->head,
742 page = con->msgr->zero_page;
744 kaddr = page_address(con->msgr->zero_page);
746 len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
747 (int)(data_len - con->out_msg_pos.data_pos));
748 if (crc && !con->out_msg_pos.did_page_crc) {
749 void *base = kaddr + con->out_msg_pos.page_pos;
750 u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
752 BUG_ON(kaddr == NULL);
753 con->out_msg->footer.data_crc =
754 cpu_to_le32(crc32c(tmpcrc, base, len));
755 con->out_msg_pos.did_page_crc = 1;
758 ret = kernel_sendpage(con->sock, page,
759 con->out_msg_pos.page_pos, len,
760 MSG_DONTWAIT | MSG_NOSIGNAL |
763 if (crc && (msg->pages || msg->pagelist))
769 con->out_msg_pos.data_pos += ret;
770 con->out_msg_pos.page_pos += ret;
772 con->out_msg_pos.page_pos = 0;
773 con->out_msg_pos.page++;
774 con->out_msg_pos.did_page_crc = 0;
776 list_move_tail(&page->lru,
777 &msg->pagelist->head);
781 dout("write_partial_msg_pages %p msg %p done\n", con, msg);
783 /* prepare and queue up footer, too */
785 con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
786 con->out_kvec_bytes = 0;
787 con->out_kvec_left = 0;
788 con->out_kvec_cur = con->out_kvec;
789 prepare_write_message_footer(con, 0);
798 static int write_partial_skip(struct ceph_connection *con)
802 while (con->out_skip > 0) {
804 .iov_base = page_address(con->msgr->zero_page),
805 .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
808 ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
811 con->out_skip -= ret;
819 * Prepare to read connection handshake, or an ack.
821 static void prepare_read_banner(struct ceph_connection *con)
823 dout("prepare_read_banner %p\n", con);
824 con->in_base_pos = 0;
827 static void prepare_read_connect(struct ceph_connection *con)
829 dout("prepare_read_connect %p\n", con);
830 con->in_base_pos = 0;
833 static void prepare_read_ack(struct ceph_connection *con)
835 dout("prepare_read_ack %p\n", con);
836 con->in_base_pos = 0;
839 static void prepare_read_tag(struct ceph_connection *con)
841 dout("prepare_read_tag %p\n", con);
842 con->in_base_pos = 0;
843 con->in_tag = CEPH_MSGR_TAG_READY;
847 * Prepare to read a message.
849 static int prepare_read_message(struct ceph_connection *con)
851 dout("prepare_read_message %p\n", con);
852 BUG_ON(con->in_msg != NULL);
853 con->in_base_pos = 0;
854 con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
859 static int read_partial(struct ceph_connection *con,
860 int *to, int size, void *object)
863 while (con->in_base_pos < *to) {
864 int left = *to - con->in_base_pos;
865 int have = size - left;
866 int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
869 con->in_base_pos += ret;
876 * Read all or part of the connect-side handshake on a new connection
878 static int read_partial_banner(struct ceph_connection *con)
882 dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
885 ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
888 ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
889 &con->actual_peer_addr);
892 ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
893 &con->peer_addr_for_me);
900 static int read_partial_connect(struct ceph_connection *con)
904 dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
906 ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
909 ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
910 con->auth_reply_buf);
914 dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
915 con, (int)con->in_reply.tag,
916 le32_to_cpu(con->in_reply.connect_seq),
917 le32_to_cpu(con->in_reply.global_seq));
924 * Verify the hello banner looks okay.
926 static int verify_hello(struct ceph_connection *con)
928 if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
929 pr_err("connect to %s got bad banner\n",
930 pr_addr(&con->peer_addr.in_addr));
931 con->error_msg = "protocol error, bad banner";
937 static bool addr_is_blank(struct sockaddr_storage *ss)
939 switch (ss->ss_family) {
941 return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
944 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
945 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
946 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
947 ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
952 static int addr_port(struct sockaddr_storage *ss)
954 switch (ss->ss_family) {
956 return ntohs(((struct sockaddr_in *)ss)->sin_port);
958 return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
963 static void addr_set_port(struct sockaddr_storage *ss, int p)
965 switch (ss->ss_family) {
967 ((struct sockaddr_in *)ss)->sin_port = htons(p);
969 ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
974 * Parse an ip[:port] list into an addr array. Use the default
975 * monitor port if a port isn't specified.
977 int ceph_parse_ips(const char *c, const char *end,
978 struct ceph_entity_addr *addr,
979 int max_count, int *count)
984 dout("parse_ips on '%.*s'\n", (int)(end-c), c);
985 for (i = 0; i < max_count; i++) {
987 struct sockaddr_storage *ss = &addr[i].in_addr;
988 struct sockaddr_in *in4 = (void *)ss;
989 struct sockaddr_in6 *in6 = (void *)ss;
992 memset(ss, 0, sizeof(*ss));
993 if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
995 ss->ss_family = AF_INET;
996 } else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
998 ss->ss_family = AF_INET6;
1005 if (p < end && *p == ':') {
1008 while (p < end && *p >= '0' && *p <= '9') {
1009 port = (port * 10) + (*p - '0');
1012 if (port > 65535 || port == 0)
1015 port = CEPH_MON_PORT;
1018 addr_set_port(ss, port);
1020 dout("parse_ips got %s\n", pr_addr(ss));
1037 pr_err("parse_ips bad ip '%s'\n", c);
1041 static int process_banner(struct ceph_connection *con)
1043 dout("process_banner on %p\n", con);
1045 if (verify_hello(con) < 0)
1048 ceph_decode_addr(&con->actual_peer_addr);
1049 ceph_decode_addr(&con->peer_addr_for_me);
1052 * Make sure the other end is who we wanted. note that the other
1053 * end may not yet know their ip address, so if it's 0.0.0.0, give
1054 * them the benefit of the doubt.
1056 if (memcmp(&con->peer_addr, &con->actual_peer_addr,
1057 sizeof(con->peer_addr)) != 0 &&
1058 !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
1059 con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
1060 pr_warning("wrong peer, want %s/%lld, got %s/%lld\n",
1061 pr_addr(&con->peer_addr.in_addr),
1062 le64_to_cpu(con->peer_addr.nonce),
1063 pr_addr(&con->actual_peer_addr.in_addr),
1064 le64_to_cpu(con->actual_peer_addr.nonce));
1065 con->error_msg = "wrong peer at address";
1070 * did we learn our address?
1072 if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
1073 int port = addr_port(&con->msgr->inst.addr.in_addr);
1075 memcpy(&con->msgr->inst.addr.in_addr,
1076 &con->peer_addr_for_me.in_addr,
1077 sizeof(con->peer_addr_for_me.in_addr));
1078 addr_set_port(&con->msgr->inst.addr.in_addr, port);
1079 encode_my_addr(con->msgr);
1080 dout("process_banner learned my addr is %s\n",
1081 pr_addr(&con->msgr->inst.addr.in_addr));
1084 set_bit(NEGOTIATING, &con->state);
1085 prepare_read_connect(con);
1089 static void fail_protocol(struct ceph_connection *con)
1091 reset_connection(con);
1092 set_bit(CLOSED, &con->state); /* in case there's queued work */
1094 mutex_unlock(&con->mutex);
1095 if (con->ops->bad_proto)
1096 con->ops->bad_proto(con);
1097 mutex_lock(&con->mutex);
1100 static int process_connect(struct ceph_connection *con)
1102 u64 sup_feat = CEPH_FEATURE_SUPPORTED;
1103 u64 req_feat = CEPH_FEATURE_REQUIRED;
1104 u64 server_feat = le64_to_cpu(con->in_reply.features);
1106 dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
1108 switch (con->in_reply.tag) {
1109 case CEPH_MSGR_TAG_FEATURES:
1110 pr_err("%s%lld %s feature set mismatch,"
1111 " my %llx < server's %llx, missing %llx\n",
1112 ENTITY_NAME(con->peer_name),
1113 pr_addr(&con->peer_addr.in_addr),
1114 sup_feat, server_feat, server_feat & ~sup_feat);
1115 con->error_msg = "missing required protocol features";
1119 case CEPH_MSGR_TAG_BADPROTOVER:
1120 pr_err("%s%lld %s protocol version mismatch,"
1121 " my %d != server's %d\n",
1122 ENTITY_NAME(con->peer_name),
1123 pr_addr(&con->peer_addr.in_addr),
1124 le32_to_cpu(con->out_connect.protocol_version),
1125 le32_to_cpu(con->in_reply.protocol_version));
1126 con->error_msg = "protocol version mismatch";
1130 case CEPH_MSGR_TAG_BADAUTHORIZER:
1132 dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
1134 if (con->auth_retry == 2) {
1135 con->error_msg = "connect authorization failure";
1136 reset_connection(con);
1137 set_bit(CLOSED, &con->state);
1140 con->auth_retry = 1;
1141 prepare_write_connect(con->msgr, con, 0);
1142 prepare_read_connect(con);
1145 case CEPH_MSGR_TAG_RESETSESSION:
1147 * If we connected with a large connect_seq but the peer
1148 * has no record of a session with us (no connection, or
1149 * connect_seq == 0), they will send RESETSESION to indicate
1150 * that they must have reset their session, and may have
1153 dout("process_connect got RESET peer seq %u\n",
1154 le32_to_cpu(con->in_connect.connect_seq));
1155 pr_err("%s%lld %s connection reset\n",
1156 ENTITY_NAME(con->peer_name),
1157 pr_addr(&con->peer_addr.in_addr));
1158 reset_connection(con);
1159 prepare_write_connect(con->msgr, con, 0);
1160 prepare_read_connect(con);
1162 /* Tell ceph about it. */
1163 mutex_unlock(&con->mutex);
1164 pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
1165 if (con->ops->peer_reset)
1166 con->ops->peer_reset(con);
1167 mutex_lock(&con->mutex);
1170 case CEPH_MSGR_TAG_RETRY_SESSION:
1172 * If we sent a smaller connect_seq than the peer has, try
1173 * again with a larger value.
1175 dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
1176 le32_to_cpu(con->out_connect.connect_seq),
1177 le32_to_cpu(con->in_connect.connect_seq));
1178 con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
1179 prepare_write_connect(con->msgr, con, 0);
1180 prepare_read_connect(con);
1183 case CEPH_MSGR_TAG_RETRY_GLOBAL:
1185 * If we sent a smaller global_seq than the peer has, try
1186 * again with a larger value.
1188 dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
1189 con->peer_global_seq,
1190 le32_to_cpu(con->in_connect.global_seq));
1191 get_global_seq(con->msgr,
1192 le32_to_cpu(con->in_connect.global_seq));
1193 prepare_write_connect(con->msgr, con, 0);
1194 prepare_read_connect(con);
1197 case CEPH_MSGR_TAG_READY:
1198 if (req_feat & ~server_feat) {
1199 pr_err("%s%lld %s protocol feature mismatch,"
1200 " my required %llx > server's %llx, need %llx\n",
1201 ENTITY_NAME(con->peer_name),
1202 pr_addr(&con->peer_addr.in_addr),
1203 req_feat, server_feat, req_feat & ~server_feat);
1204 con->error_msg = "missing required protocol features";
1208 clear_bit(CONNECTING, &con->state);
1209 con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
1211 dout("process_connect got READY gseq %d cseq %d (%d)\n",
1212 con->peer_global_seq,
1213 le32_to_cpu(con->in_reply.connect_seq),
1215 WARN_ON(con->connect_seq !=
1216 le32_to_cpu(con->in_reply.connect_seq));
1218 if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
1219 set_bit(LOSSYTX, &con->state);
1221 prepare_read_tag(con);
1224 case CEPH_MSGR_TAG_WAIT:
1226 * If there is a connection race (we are opening
1227 * connections to each other), one of us may just have
1228 * to WAIT. This shouldn't happen if we are the
1231 pr_err("process_connect peer connecting WAIT\n");
1234 pr_err("connect protocol error, will retry\n");
1235 con->error_msg = "protocol error, garbage tag during connect";
1243 * read (part of) an ack
1245 static int read_partial_ack(struct ceph_connection *con)
1249 return read_partial(con, &to, sizeof(con->in_temp_ack),
1255 * We can finally discard anything that's been acked.
1257 static void process_ack(struct ceph_connection *con)
1260 u64 ack = le64_to_cpu(con->in_temp_ack);
1263 while (!list_empty(&con->out_sent)) {
1264 m = list_first_entry(&con->out_sent, struct ceph_msg,
1266 seq = le64_to_cpu(m->hdr.seq);
1269 dout("got ack for seq %llu type %d at %p\n", seq,
1270 le16_to_cpu(m->hdr.type), m);
1273 prepare_read_tag(con);
1279 static int read_partial_message_section(struct ceph_connection *con,
1280 struct kvec *section, unsigned int sec_len,
1288 while (section->iov_len < sec_len) {
1289 BUG_ON(section->iov_base == NULL);
1290 left = sec_len - section->iov_len;
1291 ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
1292 section->iov_len, left);
1295 section->iov_len += ret;
1296 if (section->iov_len == sec_len)
1297 *crc = crc32c(0, section->iov_base,
1304 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
1305 struct ceph_msg_header *hdr,
1308 * read (part of) a message.
1310 static int read_partial_message(struct ceph_connection *con)
1312 struct ceph_msg *m = con->in_msg;
1316 unsigned front_len, middle_len, data_len, data_off;
1317 int datacrc = con->msgr->nocrc;
1320 dout("read_partial_message con %p msg %p\n", con, m);
1323 while (con->in_base_pos < sizeof(con->in_hdr)) {
1324 left = sizeof(con->in_hdr) - con->in_base_pos;
1325 ret = ceph_tcp_recvmsg(con->sock,
1326 (char *)&con->in_hdr + con->in_base_pos,
1330 con->in_base_pos += ret;
1331 if (con->in_base_pos == sizeof(con->in_hdr)) {
1332 u32 crc = crc32c(0, (void *)&con->in_hdr,
1333 sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
1334 if (crc != le32_to_cpu(con->in_hdr.crc)) {
1335 pr_err("read_partial_message bad hdr "
1336 " crc %u != expected %u\n",
1337 crc, con->in_hdr.crc);
1342 front_len = le32_to_cpu(con->in_hdr.front_len);
1343 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
1345 middle_len = le32_to_cpu(con->in_hdr.middle_len);
1346 if (middle_len > CEPH_MSG_MAX_DATA_LEN)
1348 data_len = le32_to_cpu(con->in_hdr.data_len);
1349 if (data_len > CEPH_MSG_MAX_DATA_LEN)
1351 data_off = le16_to_cpu(con->in_hdr.data_off);
1353 /* allocate message? */
1355 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
1356 con->in_hdr.front_len, con->in_hdr.data_len);
1357 con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
1359 /* skip this message */
1360 dout("alloc_msg returned NULL, skipping message\n");
1361 con->in_base_pos = -front_len - middle_len - data_len -
1363 con->in_tag = CEPH_MSGR_TAG_READY;
1366 if (IS_ERR(con->in_msg)) {
1367 ret = PTR_ERR(con->in_msg);
1370 "error allocating memory for incoming message";
1374 m->front.iov_len = 0; /* haven't read it yet */
1376 m->middle->vec.iov_len = 0;
1378 con->in_msg_pos.page = 0;
1379 con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
1380 con->in_msg_pos.data_pos = 0;
1384 ret = read_partial_message_section(con, &m->front, front_len,
1385 &con->in_front_crc);
1391 ret = read_partial_message_section(con, &m->middle->vec, middle_len,
1392 &con->in_middle_crc);
1398 while (con->in_msg_pos.data_pos < data_len) {
1399 left = min((int)(data_len - con->in_msg_pos.data_pos),
1400 (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
1401 BUG_ON(m->pages == NULL);
1402 p = kmap(m->pages[con->in_msg_pos.page]);
1403 ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
1405 if (ret > 0 && datacrc)
1407 crc32c(con->in_data_crc,
1408 p + con->in_msg_pos.page_pos, ret);
1409 kunmap(m->pages[con->in_msg_pos.page]);
1412 con->in_msg_pos.data_pos += ret;
1413 con->in_msg_pos.page_pos += ret;
1414 if (con->in_msg_pos.page_pos == PAGE_SIZE) {
1415 con->in_msg_pos.page_pos = 0;
1416 con->in_msg_pos.page++;
1421 to = sizeof(m->hdr) + sizeof(m->footer);
1422 while (con->in_base_pos < to) {
1423 left = to - con->in_base_pos;
1424 ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
1425 (con->in_base_pos - sizeof(m->hdr)),
1429 con->in_base_pos += ret;
1431 dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
1432 m, front_len, m->footer.front_crc, middle_len,
1433 m->footer.middle_crc, data_len, m->footer.data_crc);
1436 if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
1437 pr_err("read_partial_message %p front crc %u != exp. %u\n",
1438 m, con->in_front_crc, m->footer.front_crc);
1441 if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
1442 pr_err("read_partial_message %p middle crc %u != exp %u\n",
1443 m, con->in_middle_crc, m->footer.middle_crc);
1447 (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
1448 con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
1449 pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
1450 con->in_data_crc, le32_to_cpu(m->footer.data_crc));
1454 return 1; /* done! */
1458 * Process message. This happens in the worker thread. The callback should
1459 * be careful not to do anything that waits on other incoming messages or it
1462 static void process_message(struct ceph_connection *con)
1464 struct ceph_msg *msg;
1469 /* if first message, set peer_name */
1470 if (con->peer_name.type == 0)
1471 con->peer_name = msg->hdr.src.name;
1474 mutex_unlock(&con->mutex);
1476 dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
1477 msg, le64_to_cpu(msg->hdr.seq),
1478 ENTITY_NAME(msg->hdr.src.name),
1479 le16_to_cpu(msg->hdr.type),
1480 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1481 le32_to_cpu(msg->hdr.front_len),
1482 le32_to_cpu(msg->hdr.data_len),
1483 con->in_front_crc, con->in_middle_crc, con->in_data_crc);
1484 con->ops->dispatch(con, msg);
1486 mutex_lock(&con->mutex);
1487 prepare_read_tag(con);
1492 * Write something to the socket. Called in a worker thread when the
1493 * socket appears to be writeable and we have something ready to send.
1495 static int try_write(struct ceph_connection *con)
1497 struct ceph_messenger *msgr = con->msgr;
1500 dout("try_write start %p state %lu nref %d\n", con, con->state,
1501 atomic_read(&con->nref));
1503 mutex_lock(&con->mutex);
1505 dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
1507 /* open the socket first? */
1508 if (con->sock == NULL) {
1510 * if we were STANDBY and are reconnecting _this_
1511 * connection, bump connect_seq now. Always bump
1514 if (test_and_clear_bit(STANDBY, &con->state))
1517 prepare_write_banner(msgr, con);
1518 prepare_write_connect(msgr, con, 1);
1519 prepare_read_banner(con);
1520 set_bit(CONNECTING, &con->state);
1521 clear_bit(NEGOTIATING, &con->state);
1523 BUG_ON(con->in_msg);
1524 con->in_tag = CEPH_MSGR_TAG_READY;
1525 dout("try_write initiating connect on %p new state %lu\n",
1527 con->sock = ceph_tcp_connect(con);
1528 if (IS_ERR(con->sock)) {
1530 con->error_msg = "connect error";
1537 /* kvec data queued? */
1538 if (con->out_skip) {
1539 ret = write_partial_skip(con);
1543 dout("try_write write_partial_skip err %d\n", ret);
1547 if (con->out_kvec_left) {
1548 ret = write_partial_kvec(con);
1555 if (con->out_msg_done) {
1556 ceph_msg_put(con->out_msg);
1557 con->out_msg = NULL; /* we're done with this one */
1561 ret = write_partial_msg_pages(con);
1563 goto more_kvec; /* we need to send the footer, too! */
1567 dout("try_write write_partial_msg_pages err %d\n",
1574 if (!test_bit(CONNECTING, &con->state)) {
1575 /* is anything else pending? */
1576 if (!list_empty(&con->out_queue)) {
1577 prepare_write_message(con);
1580 if (con->in_seq > con->in_seq_acked) {
1581 prepare_write_ack(con);
1584 if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
1585 prepare_write_keepalive(con);
1590 /* Nothing to do! */
1591 clear_bit(WRITE_PENDING, &con->state);
1592 dout("try_write nothing else to write.\n");
1596 mutex_unlock(&con->mutex);
1597 dout("try_write done on %p\n", con);
1604 * Read what we can from the socket.
1606 static int try_read(struct ceph_connection *con)
1608 struct ceph_messenger *msgr;
1614 if (test_bit(STANDBY, &con->state))
1617 dout("try_read start on %p\n", con);
1620 mutex_lock(&con->mutex);
1623 dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
1625 if (test_bit(CONNECTING, &con->state)) {
1626 if (!test_bit(NEGOTIATING, &con->state)) {
1627 dout("try_read connecting\n");
1628 ret = read_partial_banner(con);
1631 if (process_banner(con) < 0) {
1636 ret = read_partial_connect(con);
1639 if (process_connect(con) < 0) {
1646 if (con->in_base_pos < 0) {
1648 * skipping + discarding content.
1650 * FIXME: there must be a better way to do this!
1652 static char buf[1024];
1653 int skip = min(1024, -con->in_base_pos);
1654 dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
1655 ret = ceph_tcp_recvmsg(con->sock, buf, skip);
1658 con->in_base_pos += ret;
1659 if (con->in_base_pos)
1662 if (con->in_tag == CEPH_MSGR_TAG_READY) {
1666 ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
1669 dout("try_read got tag %d\n", (int)con->in_tag);
1670 switch (con->in_tag) {
1671 case CEPH_MSGR_TAG_MSG:
1672 prepare_read_message(con);
1674 case CEPH_MSGR_TAG_ACK:
1675 prepare_read_ack(con);
1677 case CEPH_MSGR_TAG_CLOSE:
1678 set_bit(CLOSED, &con->state); /* fixme */
1684 if (con->in_tag == CEPH_MSGR_TAG_MSG) {
1685 ret = read_partial_message(con);
1689 con->error_msg = "bad crc";
1693 con->error_msg = "io error";
1699 if (con->in_tag == CEPH_MSGR_TAG_READY)
1701 process_message(con);
1704 if (con->in_tag == CEPH_MSGR_TAG_ACK) {
1705 ret = read_partial_ack(con);
1715 mutex_unlock(&con->mutex);
1716 dout("try_read done on %p\n", con);
1720 pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
1721 con->error_msg = "protocol error, garbage tag";
1728 * Atomically queue work on a connection. Bump @con reference to
1729 * avoid races with connection teardown.
1731 * There is some trickery going on with QUEUED and BUSY because we
1732 * only want a _single_ thread operating on each connection at any
1733 * point in time, but we want to use all available CPUs.
1735 * The worker thread only proceeds if it can atomically set BUSY. It
1736 * clears QUEUED and does it's thing. When it thinks it's done, it
1737 * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
1738 * (tries again to set BUSY).
1740 * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
1741 * try to queue work. If that fails (work is already queued, or BUSY)
1742 * we give up (work also already being done or is queued) but leave QUEUED
1743 * set so that the worker thread will loop if necessary.
1745 static void queue_con(struct ceph_connection *con)
1747 if (test_bit(DEAD, &con->state)) {
1748 dout("queue_con %p ignoring: DEAD\n",
1753 if (!con->ops->get(con)) {
1754 dout("queue_con %p ref count 0\n", con);
1758 set_bit(QUEUED, &con->state);
1759 if (test_bit(BUSY, &con->state)) {
1760 dout("queue_con %p - already BUSY\n", con);
1762 } else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
1763 dout("queue_con %p - already queued\n", con);
1766 dout("queue_con %p\n", con);
1771 * Do some work on a connection. Drop a connection ref when we're done.
1773 static void con_work(struct work_struct *work)
1775 struct ceph_connection *con = container_of(work, struct ceph_connection,
1780 if (test_and_set_bit(BUSY, &con->state) != 0) {
1781 dout("con_work %p BUSY already set\n", con);
1784 dout("con_work %p start, clearing QUEUED\n", con);
1785 clear_bit(QUEUED, &con->state);
1787 if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
1788 dout("con_work CLOSED\n");
1789 con_close_socket(con);
1792 if (test_and_clear_bit(OPENING, &con->state)) {
1793 /* reopen w/ new peer */
1794 dout("con_work OPENING\n");
1795 con_close_socket(con);
1798 if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
1799 try_read(con) < 0 ||
1800 try_write(con) < 0) {
1802 ceph_fault(con); /* error/fault path */
1806 clear_bit(BUSY, &con->state);
1807 dout("con->state=%lu\n", con->state);
1808 if (test_bit(QUEUED, &con->state)) {
1809 if (!backoff || test_bit(OPENING, &con->state)) {
1810 dout("con_work %p QUEUED reset, looping\n", con);
1813 dout("con_work %p QUEUED reset, but just faulted\n", con);
1814 clear_bit(QUEUED, &con->state);
1816 dout("con_work %p done\n", con);
1824 * Generic error/fault handler. A retry mechanism is used with
1825 * exponential backoff
1827 static void ceph_fault(struct ceph_connection *con)
1829 pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
1830 pr_addr(&con->peer_addr.in_addr), con->error_msg);
1831 dout("fault %p state %lu to peer %s\n",
1832 con, con->state, pr_addr(&con->peer_addr.in_addr));
1834 if (test_bit(LOSSYTX, &con->state)) {
1835 dout("fault on LOSSYTX channel\n");
1839 clear_bit(BUSY, &con->state); /* to avoid an improbable race */
1841 mutex_lock(&con->mutex);
1842 if (test_bit(CLOSED, &con->state))
1845 con_close_socket(con);
1848 ceph_msg_put(con->in_msg);
1852 /* Requeue anything that hasn't been acked */
1853 list_splice_init(&con->out_sent, &con->out_queue);
1855 /* If there are no messages in the queue, place the connection
1856 * in a STANDBY state (i.e., don't try to reconnect just yet). */
1857 if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
1858 dout("fault setting STANDBY\n");
1859 set_bit(STANDBY, &con->state);
1861 /* retry after a delay. */
1862 if (con->delay == 0)
1863 con->delay = BASE_DELAY_INTERVAL;
1864 else if (con->delay < MAX_DELAY_INTERVAL)
1866 dout("fault queueing %p delay %lu\n", con, con->delay);
1868 if (queue_delayed_work(ceph_msgr_wq, &con->work,
1869 round_jiffies_relative(con->delay)) == 0)
1874 mutex_unlock(&con->mutex);
1877 * in case we faulted due to authentication, invalidate our
1878 * current tickets so that we can get new ones.
1880 if (con->auth_retry && con->ops->invalidate_authorizer) {
1881 dout("calling invalidate_authorizer()\n");
1882 con->ops->invalidate_authorizer(con);
1885 if (con->ops->fault)
1886 con->ops->fault(con);
1892 * create a new messenger instance
1894 struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
1896 struct ceph_messenger *msgr;
1898 msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
1900 return ERR_PTR(-ENOMEM);
1902 spin_lock_init(&msgr->global_seq_lock);
1904 /* the zero page is needed if a request is "canceled" while the message
1905 * is being written over the socket */
1906 msgr->zero_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1907 if (!msgr->zero_page) {
1909 return ERR_PTR(-ENOMEM);
1911 kmap(msgr->zero_page);
1914 msgr->inst.addr = *myaddr;
1916 /* select a random nonce */
1917 msgr->inst.addr.type = 0;
1918 get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
1919 encode_my_addr(msgr);
1921 dout("messenger_create %p\n", msgr);
1925 void ceph_messenger_destroy(struct ceph_messenger *msgr)
1927 dout("destroy %p\n", msgr);
1928 kunmap(msgr->zero_page);
1929 __free_page(msgr->zero_page);
1931 dout("destroyed messenger %p\n", msgr);
1935 * Queue up an outgoing message on the given connection.
1937 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
1939 if (test_bit(CLOSED, &con->state)) {
1940 dout("con_send %p closed, dropping %p\n", con, msg);
1946 msg->hdr.src.name = con->msgr->inst.name;
1947 msg->hdr.src.addr = con->msgr->my_enc_addr;
1948 msg->hdr.orig_src = msg->hdr.src;
1950 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
1953 mutex_lock(&con->mutex);
1954 BUG_ON(!list_empty(&msg->list_head));
1955 list_add_tail(&msg->list_head, &con->out_queue);
1956 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg,
1957 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type),
1958 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
1959 le32_to_cpu(msg->hdr.front_len),
1960 le32_to_cpu(msg->hdr.middle_len),
1961 le32_to_cpu(msg->hdr.data_len));
1962 mutex_unlock(&con->mutex);
1964 /* if there wasn't anything waiting to send before, queue
1966 if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
1971 * Revoke a message that was previously queued for send
1973 void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
1975 mutex_lock(&con->mutex);
1976 if (!list_empty(&msg->list_head)) {
1977 dout("con_revoke %p msg %p\n", con, msg);
1978 list_del_init(&msg->list_head);
1981 if (con->out_msg == msg) {
1982 ceph_msg_put(con->out_msg);
1983 con->out_msg = NULL;
1985 if (con->out_kvec_is_msg) {
1986 con->out_skip = con->out_kvec_bytes;
1987 con->out_kvec_is_msg = false;
1990 dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
1992 mutex_unlock(&con->mutex);
1996 * Revoke a message that we may be reading data into
1998 void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
2000 mutex_lock(&con->mutex);
2001 if (con->in_msg && con->in_msg == msg) {
2002 unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
2003 unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
2004 unsigned data_len = le32_to_cpu(con->in_hdr.data_len);
2006 /* skip rest of message */
2007 dout("con_revoke_pages %p msg %p revoked\n", con, msg);
2008 con->in_base_pos = con->in_base_pos -
2009 sizeof(struct ceph_msg_header) -
2013 sizeof(struct ceph_msg_footer);
2014 ceph_msg_put(con->in_msg);
2016 con->in_tag = CEPH_MSGR_TAG_READY;
2018 dout("con_revoke_pages %p msg %p pages %p no-op\n",
2019 con, con->in_msg, msg);
2021 mutex_unlock(&con->mutex);
2025 * Queue a keepalive byte to ensure the tcp connection is alive.
2027 void ceph_con_keepalive(struct ceph_connection *con)
2029 if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
2030 test_and_set_bit(WRITE_PENDING, &con->state) == 0)
2036 * construct a new message with given type, size
2037 * the new msg has a ref count of 1.
2039 struct ceph_msg *ceph_msg_new(int type, int front_len,
2040 int page_len, int page_off, struct page **pages)
2044 m = kmalloc(sizeof(*m), GFP_NOFS);
2047 kref_init(&m->kref);
2048 INIT_LIST_HEAD(&m->list_head);
2050 m->hdr.type = cpu_to_le16(type);
2051 m->hdr.front_len = cpu_to_le32(front_len);
2052 m->hdr.middle_len = 0;
2053 m->hdr.data_len = cpu_to_le32(page_len);
2054 m->hdr.data_off = cpu_to_le16(page_off);
2055 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
2056 m->footer.front_crc = 0;
2057 m->footer.middle_crc = 0;
2058 m->footer.data_crc = 0;
2059 m->front_max = front_len;
2060 m->front_is_vmalloc = false;
2061 m->more_to_follow = false;
2066 if (front_len > PAGE_CACHE_SIZE) {
2067 m->front.iov_base = __vmalloc(front_len, GFP_NOFS,
2069 m->front_is_vmalloc = true;
2071 m->front.iov_base = kmalloc(front_len, GFP_NOFS);
2073 if (m->front.iov_base == NULL) {
2074 pr_err("msg_new can't allocate %d bytes\n",
2079 m->front.iov_base = NULL;
2081 m->front.iov_len = front_len;
2087 m->nr_pages = calc_pages_for(page_off, page_len);
2091 dout("ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
2098 pr_err("msg_new can't create type %d len %d\n", type, front_len);
2099 return ERR_PTR(-ENOMEM);
2103 * Allocate "middle" portion of a message, if it is needed and wasn't
2104 * allocated by alloc_msg. This allows us to read a small fixed-size
2105 * per-type header in the front and then gracefully fail (i.e.,
2106 * propagate the error to the caller based on info in the front) when
2107 * the middle is too large.
2109 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
2111 int type = le16_to_cpu(msg->hdr.type);
2112 int middle_len = le32_to_cpu(msg->hdr.middle_len);
2114 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
2115 ceph_msg_type_name(type), middle_len);
2116 BUG_ON(!middle_len);
2117 BUG_ON(msg->middle);
2119 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
2126 * Generic message allocator, for incoming messages.
2128 static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
2129 struct ceph_msg_header *hdr,
2132 int type = le16_to_cpu(hdr->type);
2133 int front_len = le32_to_cpu(hdr->front_len);
2134 int middle_len = le32_to_cpu(hdr->middle_len);
2135 struct ceph_msg *msg = NULL;
2138 if (con->ops->alloc_msg) {
2139 mutex_unlock(&con->mutex);
2140 msg = con->ops->alloc_msg(con, hdr, skip);
2141 mutex_lock(&con->mutex);
2150 msg = ceph_msg_new(type, front_len, 0, 0, NULL);
2152 pr_err("unable to allocate msg type %d len %d\n",
2154 return ERR_PTR(-ENOMEM);
2157 memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
2160 ret = ceph_alloc_middle(con, msg);
2173 * Free a generically kmalloc'd message.
2175 void ceph_msg_kfree(struct ceph_msg *m)
2177 dout("msg_kfree %p\n", m);
2178 if (m->front_is_vmalloc)
2179 vfree(m->front.iov_base);
2181 kfree(m->front.iov_base);
2186 * Drop a msg ref. Destroy as needed.
2188 void ceph_msg_last_put(struct kref *kref)
2190 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
2192 dout("ceph_msg_put last one on %p\n", m);
2193 WARN_ON(!list_empty(&m->list_head));
2195 /* drop middle, data, if any */
2197 ceph_buffer_put(m->middle);
2204 ceph_pagelist_release(m->pagelist);
2210 ceph_msgpool_put(m->pool, m);
2215 void ceph_msg_dump(struct ceph_msg *msg)
2217 pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
2218 msg->front_max, msg->nr_pages);
2219 print_hex_dump(KERN_DEBUG, "header: ",
2220 DUMP_PREFIX_OFFSET, 16, 1,
2221 &msg->hdr, sizeof(msg->hdr), true);
2222 print_hex_dump(KERN_DEBUG, " front: ",
2223 DUMP_PREFIX_OFFSET, 16, 1,
2224 msg->front.iov_base, msg->front.iov_len, true);
2226 print_hex_dump(KERN_DEBUG, "middle: ",
2227 DUMP_PREFIX_OFFSET, 16, 1,
2228 msg->middle->vec.iov_base,
2229 msg->middle->vec.iov_len, true);
2230 print_hex_dump(KERN_DEBUG, "footer: ",
2231 DUMP_PREFIX_OFFSET, 16, 1,
2232 &msg->footer, sizeof(msg->footer), true);