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| author | Xin Long <lucien.xin@gmail.com> | 2018-10-15 19:58:29 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-15 22:54:20 -0700 |
| commit | d805397c3822d57ca3884d4bea37b2291fc40992 (patch) | |
| tree | 26a590ccde4580779a2428d6071b87bdc967bfae /net/sctp/associola.c | |
| parent | ec20a63aa8b8ec3223fb25cdb2a49f9f9dfda88c (diff) | |
| download | linux-d805397c3822d57ca3884d4bea37b2291fc40992.tar.bz2 | |
sctp: use the pmtu from the icmp packet to update transport pathmtu
Other than asoc pmtu sync from all transports, sctp_assoc_sync_pmtu
is also processing transport pmtu_pending by icmp packets. But it's
meaningless to use sctp_dst_mtu(t->dst) as new pmtu for a transport.
The right pmtu value should come from the icmp packet, and it would
be saved into transport->mtu_info in this patch and used later when
the pmtu sync happens in sctp_sendmsg_to_asoc or sctp_packet_config.
Besides, without this patch, as pmtu can only be updated correctly
when receiving a icmp packet and no place is holding sock lock, it
will take long time if the sock is busy with sending packets.
Note that it doesn't process transport->mtu_info in .release_cb(),
as there is no enough information for pmtu update, like for which
asoc or transport. It is not worth traversing all asocs to check
pmtu_pending. So unlike tcp, sctp does this in tx path, for which
mtu_info needs to be atomic_t.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/associola.c')
| -rw-r--r-- | net/sctp/associola.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 297d9cf960b9..a827a1f562bf 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -1450,7 +1450,8 @@ void sctp_assoc_sync_pmtu(struct sctp_association *asoc) /* Get the lowest pmtu of all the transports. */ list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { if (t->pmtu_pending && t->dst) { - sctp_transport_update_pmtu(t, sctp_dst_mtu(t->dst)); + sctp_transport_update_pmtu(t, + atomic_read(&t->mtu_info)); t->pmtu_pending = 0; } if (!pmtu || (t->pathmtu < pmtu)) |