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authorXin Long <lucien.xin@gmail.com>2023-01-30 19:25:33 +0300
committerJakub Kicinski <kuba@kernel.org>2023-02-01 08:01:28 +0300
commit8f35ae17ef565a605de5f409e04bcd49a55d7646 (patch)
tree41c70d21b73a166232846865233af11151ac4936 /net/sctp
parentde5ca4c3852f896cacac2bf259597aab5e17d9e3 (diff)
downloadlinux-8f35ae17ef565a605de5f409e04bcd49a55d7646.tar.xz
sctp: do not check hb_timer.expires when resetting hb_timer
It tries to avoid the frequently hb_timer refresh in commit ba6f5e33bdbb ("sctp: avoid refreshing heartbeat timer too often"), and it only allows mod_timer when the new expires is after hb_timer.expires. It means even a much shorter interval for hb timer gets applied, it will have to wait until the current hb timer to time out. In sctp_do_8_2_transport_strike(), when a transport enters PF state, it expects to update the hb timer to resend a heartbeat every rto after calling sctp_transport_reset_hb_timer(), which will not work as the change mentioned above. The frequently hb_timer refresh was caused by sctp_transport_reset_timers() called in sctp_outq_flush() and it was already removed in the commit above. So we don't have to check hb_timer.expires when resetting hb_timer as it is now not called very often. Fixes: ba6f5e33bdbb ("sctp: avoid refreshing heartbeat timer too often") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Link: https://lore.kernel.org/r/d958c06985713ec84049a2d5664879802710179a.1675095933.git.lucien.xin@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/transport.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index ca1eba95c293..2f66a2006517 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -196,9 +196,7 @@ void sctp_transport_reset_hb_timer(struct sctp_transport *transport)
/* When a data chunk is sent, reset the heartbeat interval. */
expires = jiffies + sctp_transport_timeout(transport);
- if ((time_before(transport->hb_timer.expires, expires) ||
- !timer_pending(&transport->hb_timer)) &&
- !mod_timer(&transport->hb_timer,
+ if (!mod_timer(&transport->hb_timer,
expires + get_random_u32_below(transport->rto)))
sctp_transport_hold(transport);
}