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| author | Eelco Chaudron <echaudro@redhat.com> | 2023-02-07 15:05:25 +0100 |
|---|---|---|
| committer | Ilya Maximets <i.maximets@ovn.org> | 2023-02-09 00:32:55 +0100 |
| commit | b292cce2ff5336524874b80da26b60c653984ca4 (patch) | |
| tree | 02f60c45d00cb4ccec3000d9a303b543bd846ab1 /Documentation | |
| parent | 7a176f9636932bf7339fd8a3dbe194f28de871d3 (diff) | |
| download | openvswitch-b292cce2ff5336524874b80da26b60c653984ca4.tar.gz | |
netdev-offload-tc: Conntrack ALGs are not supported with tc.
tc does not support conntrack ALGs. Even worse, with tc enabled, they
should not be used/configured at all. This is because even though TC
will ignore the rules with ALG configured, i.e., they will flow through
the kernel module, return traffic might flow through a tc conntrack
rule, and it will not invoke the ALG helper.
Fixes: 576126a931cd ("netdev-offload-tc: Add conntrack support")
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Tested-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/howto/tc-offload.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/howto/tc-offload.rst b/Documentation/howto/tc-offload.rst index f6482c8af..681dff13e 100644 --- a/Documentation/howto/tc-offload.rst +++ b/Documentation/howto/tc-offload.rst @@ -112,3 +112,14 @@ First flow packet not processed by meter Packets that are received by ovs-vswitchd through an upcall before the actual meter flow is installed, are not passing TC police action and therefore are not considered for policing. + +Conntrack Application Layer Gateways (ALG) +++++++++++++++++++++++++++++++++++++++++++ + +TC does not support conntrack helpers, i.e., ALGs. TC will not offload flows if +the ALG keyword is present within the ct() action. However, this will not allow +ALGs to work within the datapath, as the return traffic without the ALG keyword +might run through a TC rule, which internally will not call the conntrack +helper required. + +So if ALG support is required, tc offload must be disabled. |