| From: |
| Paolo Abeni <pabeni-AT-redhat.com> |
| To: |
| netdev-AT-vger.kernel.org |
| Subject: |
| [PATCH net-next 0/2] udp_tunnel: GRO optimizations |
| Date: |
| Thu, 06 Mar 2025 16:56:51 +0100 |
| Message-ID: |
| <cover.1741275846.git.pabeni@redhat.com> |
| Cc: |
| Willem de Bruijn <willemdebruijn.kernel-AT-gmail.com>, "David S. Miller" <davem-AT-davemloft.net>, Eric Dumazet <edumazet-AT-google.com>, Jakub Kicinski <kuba-AT-kernel.org>, Simon Horman <horms-AT-kernel.org>, David Ahern <dsahern-AT-kernel.org> |
| Archive-link: |
| Article |
The UDP tunnel GRO stage is source of measurable overhead for workload
based on UDP-encapsulated traffic: each incoming packets requires a full
UDP socket lookup and an indirect call.
In the most common setups a single UDP tunnel device is used. In such
case we can optimize both the lookup and the indirect call.
Patch 1 tracks per netns the active UDP tunnels and replaces the socket
lookup with a single destination port comparison when possible.
Patch 2 tracks the different types of UDP tunnels and replaces the
indirect call with a static one when there is a single UDP tunnel type
active.
I measure ~5% performance improvement in TCP over UDP tunnel stream
tests on top of this series.
Paolo Abeni (2):
udp_tunnel: create a fast-path GRO lookup.
udp_tunnel: use static call for GRO hooks when possible
include/linux/udp.h | 16 ++++
include/net/netns/ipv4.h | 11 +++
include/net/udp.h | 1 +
include/net/udp_tunnel.h | 22 +++++
net/ipv4/udp.c | 15 +++-
net/ipv4/udp_offload.c | 169 ++++++++++++++++++++++++++++++++++++-
net/ipv4/udp_tunnel_core.c | 14 +++
net/ipv6/udp.c | 2 +
net/ipv6/udp_offload.c | 5 ++
9 files changed, 252 insertions(+), 3 deletions(-)
--
2.48.1
