[PATCH] net/mlx5: fix matcher priority for esp item

[Slava Ovsiienko]

> -----Original Message-----
> From: Bassam Zaid AlKilani <bzalkilani at nvidia.com>
> Sent: Thursday, July 28, 2022 17:12
> To: dev at dpdk.org
> Cc: Raslan Darawsheh <rasland at nvidia.com>; rzidane at nvidia.com;
> stable at dpdk.org; Matan Azrad <matan at nvidia.com>; Slava Ovsiienko
> <viacheslavo at nvidia.com>
> Subject: [PATCH] net/mlx5: fix matcher priority for esp item
> 
> ESP is one of IPSec protocols over both IPv4 and IPv6 and is considered a
> tunnel layer that cannot be followed by any other layer. Taking that into
> consideration, esp is considered as a 4 layer.
> 
> Not defining ESP's priority will make it match with the same priority as its
> prior IP layer, which has a layer 3 priority. This will lead to issues in
> matching and will match the packet with the first matching rule even if it
> doesn't have an esp layer in its pattern, disregarding any following rules
> that could have an esp item and can be actually a more accurate match since
> it will have a longer matching criterion.
> 
> This is fixed by defining the priority for the ESP item to have a layer 4
> priority, making the match be for the rule with the more accurate and longer
> matching criteria.
> 
> Fixes: 18ca4a4ec73a ("net/mlx5: support ESP SPI match and RSS hash")
> Cc: rzidane at nvidia.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Bassam ZaidAlKilani <bzalkilani at nvidia.com>

Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>