From c819930090fe3f74c822be765c185b3431360193 Mon Sep 17 00:00:00 2001 From: Jon Paul Maloy Date: Thu, 15 Oct 2015 14:52:46 -0400 Subject: [PATCH] tipc: update node FSM when peer RESET message is received The change made in the previous commit revealed a small flaw in the way the node FSM is updated. When the function tipc_node_link_down() is called for the last link to a node, we should check whether this was caused by a local reset or by a received RESET message from the peer. In the latter case, we can directly issue a PEER_LOST_CONTACT_EVT to the node FSM, so that it is ready to re-establish contact. If this is not done, the peer node will sometimes have to go through a second establish cycle before the link becomes stable. We fix this in this commit by conditionally issuing the mentioned event in the function tipc_node_link_down(). We also move LINK_RESET FSM even away from the link_reset() function and into the caller function, partially because it is easier to follow the code when state changes are gathered at a limited number of locations, partially because there will be cases in future commits where we don't want the link to go RESET mode when link_reset() is called. Signed-off-by: Jon Maloy Acked-by: Ying Xue Signed-off-by: David S. Miller --- net/tipc/link.c | 7 +++++-- net/tipc/link.h | 1 + net/tipc/node.c | 11 +++++++---- 3 files changed, 13 insertions(+), 6 deletions(-) diff --git a/net/tipc/link.c b/net/tipc/link.c index 737b5980020d..ff9b0b92e62e 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -120,6 +120,11 @@ bool tipc_link_is_up(struct tipc_link *l) return link_is_up(l); } +bool tipc_link_peer_is_down(struct tipc_link *l) +{ + return l->state == LINK_PEER_RESET; +} + bool tipc_link_is_reset(struct tipc_link *l) { return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); @@ -584,8 +589,6 @@ void tipc_link_purge_queues(struct tipc_link *l_ptr) void tipc_link_reset(struct tipc_link *l) { - tipc_link_fsm_evt(l, LINK_RESET_EVT); - /* Link is down, accept any session */ l->peer_session = WILDCARD_SESSION; diff --git a/net/tipc/link.h b/net/tipc/link.h index 5872f090c8d8..0201212cb49a 100644 --- a/net/tipc/link.h +++ b/net/tipc/link.h @@ -217,6 +217,7 @@ void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq); int tipc_link_fsm_evt(struct tipc_link *l, int evt); void tipc_link_reset_fragments(struct tipc_link *l_ptr); bool tipc_link_is_up(struct tipc_link *l); +bool tipc_link_peer_is_down(struct tipc_link *l); bool tipc_link_is_reset(struct tipc_link *l); bool tipc_link_is_establishing(struct tipc_link *l); bool tipc_link_is_synching(struct tipc_link *l); diff --git a/net/tipc/node.c b/net/tipc/node.c index fba6e1af28e8..d1f340116c84 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -41,7 +41,7 @@ #include "socket.h" #include "bcast.h" #include "discover.h" -#define pr_debug printk + /* Node FSM states and events: */ enum { @@ -420,6 +420,10 @@ static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, } if (!tipc_node_is_up(n)) { + if (tipc_link_peer_is_down(l)) + tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT); + tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT); + tipc_link_fsm_evt(l, LINK_RESET_EVT); tipc_link_reset(l); tipc_link_build_reset_msg(l, xmitq); *maddr = &n->links[*bearer_id].maddr; @@ -434,6 +438,7 @@ static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id, n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1); tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq); tipc_link_reset(l); + tipc_link_fsm_evt(l, LINK_RESET_EVT); tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT); *maddr = &n->links[tnl->bearer_id].maddr; @@ -581,6 +586,7 @@ void tipc_node_check_dest(struct net *net, u32 onode, goto exit; } tipc_link_reset(l); + tipc_link_fsm_evt(l, LINK_RESET_EVT); if (n->state == NODE_FAILINGOVER) tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT); le->link = l; @@ -863,9 +869,6 @@ static void node_lost_contact(struct tipc_node *n_ptr, tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT); } - /* Prevent re-contact with node until cleanup is done */ - tipc_node_fsm_evt(n_ptr, SELF_LOST_CONTACT_EVT); - /* Notify publications from this node */ n_ptr->action_flags |= TIPC_NOTIFY_NODE_DOWN; -- 2.20.1