diff options
Diffstat (limited to 'net/tipc/link.c')
| -rw-r--r-- | net/tipc/link.c | 61 |
1 files changed, 58 insertions, 3 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 20f128fc2be..87bf5aad704 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1,7 +1,7 @@ /* * net/tipc/link.c: TIPC link code * - * Copyright (c) 1996-2007, Ericsson AB + * Copyright (c) 1996-2007, 2012, Ericsson AB * Copyright (c) 2004-2007, 2010-2011, Wind River Systems * All rights reserved. * @@ -103,6 +103,8 @@ static void link_reset_statistics(struct tipc_link *l_ptr); static void link_print(struct tipc_link *l_ptr, const char *str); static void link_start(struct tipc_link *l_ptr); static int link_send_long_buf(struct tipc_link *l_ptr, struct sk_buff *buf); +static void tipc_link_send_sync(struct tipc_link *l); +static void tipc_link_recv_sync(struct tipc_node *n, struct sk_buff *buf); /* * Simple link routines @@ -712,6 +714,8 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event) link_activate(l_ptr); tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); l_ptr->fsm_msg_cnt++; + if (l_ptr->owner->working_links == 1) + tipc_link_send_sync(l_ptr); link_set_timer(l_ptr, cont_intv); break; case RESET_MSG: @@ -745,6 +749,8 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event) link_activate(l_ptr); tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0); l_ptr->fsm_msg_cnt++; + if (l_ptr->owner->working_links == 1) + tipc_link_send_sync(l_ptr); link_set_timer(l_ptr, cont_intv); break; case RESET_MSG: @@ -941,7 +947,48 @@ int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector) return res; } -/** +/* + * tipc_link_send_sync - synchronize broadcast link endpoints. + * + * Give a newly added peer node the sequence number where it should + * start receiving and acking broadcast packets. + * + * Called with node locked + */ +static void tipc_link_send_sync(struct tipc_link *l) +{ + struct sk_buff *buf; + struct tipc_msg *msg; + + buf = tipc_buf_acquire(INT_H_SIZE); + if (!buf) + return; + + msg = buf_msg(buf); + tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, l->addr); + msg_set_last_bcast(msg, l->owner->bclink.acked); + link_add_chain_to_outqueue(l, buf, 0); + tipc_link_push_queue(l); +} + +/* + * tipc_link_recv_sync - synchronize broadcast link endpoints. + * Receive the sequence number where we should start receiving and + * acking broadcast packets from a newly added peer node, and open + * up for reception of such packets. + * + * Called with node locked + */ +static void tipc_link_recv_sync(struct tipc_node *n, struct sk_buff *buf) +{ + struct tipc_msg *msg = buf_msg(buf); + + n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); + n->bclink.recv_permitted = true; + kfree_skb(buf); +} + +/* * tipc_link_send_names - send name table entries to new neighbor * * Send routine for bulk delivery of name table messages when contact @@ -1691,9 +1738,14 @@ deliver: tipc_link_recv_bundle(buf); continue; case NAME_DISTRIBUTOR: + n_ptr->bclink.recv_permitted = true; tipc_node_unlock(n_ptr); tipc_named_recv(buf); continue; + case BCAST_PROTOCOL: + tipc_link_recv_sync(n_ptr, buf); + tipc_node_unlock(n_ptr); + continue; case CONN_MANAGER: tipc_node_unlock(n_ptr); tipc_port_recv_proto_msg(buf); @@ -1736,16 +1788,19 @@ deliver: continue; } + /* Link is not in state WORKING_WORKING */ if (msg_user(msg) == LINK_PROTOCOL) { link_recv_proto_msg(l_ptr, buf); head = link_insert_deferred_queue(l_ptr, head); tipc_node_unlock(n_ptr); continue; } + + /* Traffic message. Conditionally activate link */ link_state_event(l_ptr, TRAFFIC_MSG_EVT); if (link_working_working(l_ptr)) { - /* Re-insert in front of queue */ + /* Re-insert buffer in front of queue */ buf->next = head; head = buf; tipc_node_unlock(n_ptr); |