When a packet is received, the RSS hash is calculated if it is not already available. The Exact Match Cache (EMC) entry is then looked up using this RSS hash.
When a MPLS encapsulated packet is received, the MPLS header is popped and the packet is recirculated. Since the RSS hash has not been invalidated here, the EMC lookup will hit the same entry as that before recirculation. This degrades performance severely. This patch invalidates RSS hash (by resetting offload flags) after MPLS header is popped. Signed-off-by: Nitin Katiyar <[email protected]> --- lib/packets.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/packets.c b/lib/packets.c index ab0b1a3..db3f6d0 100644 --- a/lib/packets.c +++ b/lib/packets.c @@ -404,6 +404,10 @@ pop_mpls(struct dp_packet *packet, ovs_be16 ethtype) struct mpls_hdr *mh = dp_packet_l2_5(packet); size_t len = packet->l2_5_ofs; + /* Invalidate offload flags as they are not valid after + * decapsulation of MPLS header. */ + dp_packet_reset_offload(packet); + set_ethertype(packet, ethtype); if (get_16aligned_be32(&mh->mpls_lse) & htonl(MPLS_BOS_MASK)) { dp_packet_set_l2_5(packet, NULL); -- 1.9.1 _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
