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| author | Jakub Kicinski <kuba@kernel.org> | 2020-09-25 17:56:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-09-28 12:50:12 -0700 |
| commit | 33a1aaf82bcf41a9d23539f859c83daa385beca5 (patch) | |
| tree | 62c5788cb6cd4aab5309c5550bc2ce43f3f9ecd5 /Documentation | |
| parent | 8c4cf4bc3ea7d6a2724f9399ad3d8f189fc92456 (diff) | |
docs: vxlan: add info about device features
Add some information about VxLAN-related netdev features
and how to dump port table via ethtool.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/networking/vxlan.rst | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/networking/vxlan.rst b/Documentation/networking/vxlan.rst index ce239fa01848..2759dc1cc525 100644 --- a/Documentation/networking/vxlan.rst +++ b/Documentation/networking/vxlan.rst @@ -58,3 +58,31 @@ forwarding table using the new bridge command. 3. Show forwarding table:: # bridge fdb show dev vxlan0 + +The following NIC features may indicate support for UDP tunnel-related +offloads (most commonly VXLAN features, but support for a particular +encapsulation protocol is NIC specific): + + - `tx-udp_tnl-segmentation` + - `tx-udp_tnl-csum-segmentation` + ability to perform TCP segmentation offload of UDP encapsulated frames + + - `rx-udp_tunnel-port-offload` + receive side parsing of UDP encapsulated frames which allows NICs to + perform protocol-aware offloads, like checksum validation offload of + inner frames (only needed by NICs without protocol-agnostic offloads) + +For devices supporting `rx-udp_tunnel-port-offload` the list of currently +offloaded ports can be interrogated with `ethtool`:: + + $ ethtool --show-tunnels eth0 + Tunnel information for eth0: + UDP port table 0: + Size: 4 + Types: vxlan + No entries + UDP port table 1: + Size: 4 + Types: geneve, vxlan-gpe + Entries (1): + port 1230, vxlan-gpe |