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bgpd: Allow extending peer timeout in rare case

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Currently the I/O pthread handles incoming/outgoing data
communication with all peers.  There is no attempt at modifying
the hold timers.  It's sole goal is to read/write data to appropriate
channels.  All this data is handled as *events* on the master pthread
in BGP.   The problem is that if the master pthread is extremely busy
then any packet read that would be treated as a keepalive event may
happen after the hold timer pops, due to the way thread events are handled
in lib/thread.c.

In a last gap attempt, if we notice that we have incoming data
to proceses on the input Queue, slightly delay the hold timer.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2020-06-15 10:35:50 -04:00
parent 1a5fc72066
commit d0874d195d
1 changed files with 20 additions and 0 deletions
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20
bgpd/bgp_fsm.c
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@ -512,6 +512,7 @@ static int bgp_connect_timer(struct thread *thread)
/* BGP holdtime timer. */
static int bgp_holdtime_timer(struct thread *thread)
{
atomic_size_t inq_count;
struct peer *peer;
peer = THREAD_ARG(thread);
@ -521,6 +522,25 @@ static int bgp_holdtime_timer(struct thread *thread)
zlog_debug("%s [FSM] Timer (holdtime timer expire)",
peer->host);
/*
* Given that we do not have any expectation of ordering
* for handling packets from a peer -vs- handling
* the hold timer for a peer as that they are both
* events on the peer. If we have incoming
* data on the peers inq, let's give the system a chance
* to handle that data. This can be especially true
* for systems where we are heavily loaded for one
* reason or another.
*/
inq_count = atomic_load_explicit(&peer->ibuf->count,
memory_order_relaxed);
if (inq_count) {
BGP_TIMER_ON(peer->t_holdtime, bgp_holdtime_timer,
peer->v_holdtime);
return 0;
}
THREAD_VAL(thread) = Hold_Timer_expired;
bgp_event(thread); /* bgp_event unlocks peer */