Commit 33a1aaf8 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller
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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: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8c4cf4bc

Documentation/networking/vxlan.rst

+28 −0
Original line number Diff line number Diff line
@@ -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