[PATCH] doc: document group 0 IPv6 fragment VLAN limitation

[PATCH] doc: document group 0 IPv6 fragment VLAN limitation

[Maayan Kashani]

Matching a VLAN item together with an exact IPv6 fragment next_hdr
misses on the hardware root table, while the same pattern matches
in a non-root group. Document the limitation and the supported
group 0 alternatives.

Signed-off-by: Maayan Kashani <mkashani@nvidia.com>
Acked-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
---
 doc/guides/nics/mlx5.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index c7bb6eb182e..8dd7ee9a969 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -3731,6 +3731,14 @@ Limitations
      and the first IP fragment is received,
      then this IP fragment will miss on that flow rule.
 
+#. Matching ``RTE_FLOW_ITEM_TYPE_VLAN`` together with an exact
+   ``next_hdr`` of ``RTE_FLOW_ITEM_TYPE_IPV6_FRAG_EXT``
+   is not supported on group 0 (HW root table).
+   The rule is accepted, but matching packets do not hit it.
+   Create this pattern in a non-root group.
+   On group 0, a VLAN item with a wildcard fragment ``next_hdr``,
+   and an exact ``next_hdr`` without a VLAN item, are supported.
+
 
 .. _mlx5_nat64:
 
-- 
2.25.1

Re: [PATCH] doc: document group 0 IPv6 fragment VLAN limitation

[Raslan Darawsheh]

Patch applied to next-net-mlx.

Thanks,
Raslan Darawsheh