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authorJakub Kicinski <kuba@kernel.org>2020-09-26 03:56:49 +0300
committerDavid S. Miller <davem@davemloft.net>2020-09-28 22:50:12 +0300
commit33a1aaf82bcf41a9d23539f859c83daa385beca5 (patch)
tree62c5788cb6cd4aab5309c5550bc2ce43f3f9ecd5 /Documentation/networking
parent8c4cf4bc3ea7d6a2724f9399ad3d8f189fc92456 (diff)
downloadlinux-33a1aaf82bcf41a9d23539f859c83daa385beca5.tar.xz
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/networking')
-rw-r--r--Documentation/networking/vxlan.rst28
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