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docs: vxlan: add info about device features
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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>
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Jakub Kicinski authored and David S. Miller committed Sep 28, 2020
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28 changes: 28 additions & 0 deletions Documentation/networking/vxlan.rst
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Expand Up @@ -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

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