[PATCH] net/mlx5: fix matcher priority with ICMP or ICMPv6

[Raslan Darawsheh]

> -----Original Message-----
> From: Raslan Darawsheh
> Sent: Wednesday, March 2, 2022 6:32 PM
> To: Bing Zhao <bingz at nvidia.com>; Slava Ovsiienko
> <viacheslavo at nvidia.com>; Matan Azrad <matan at nvidia.com>
> Cc: dev at dpdk.org; Jack Min <jackmin at nvidia.com>
> Subject: RE: [PATCH] net/mlx5: fix matcher priority with ICMP or ICMPv6
> 
> Hi,
> 
> > -----Original Message-----
> > From: Bing Zhao <bingz at nvidia.com>
> > Sent: Monday, February 28, 2022 1:42 PM
> > To: Slava Ovsiienko <viacheslavo at nvidia.com>; Matan Azrad
> > <matan at nvidia.com>
> > Cc: dev at dpdk.org; Raslan Darawsheh <rasland at nvidia.com>; Jack Min
> > <jackmin at nvidia.com>
> > Subject: [PATCH] net/mlx5: fix matcher priority with ICMP or ICMPv6
> >
> > On TCP/IP-based layered network, ICMP is considered and implemented as
> > part of layer 3 IP protocol. Actually, it is a user of the IP protocol
> > and must be encapsulated within IP packets. There is no layer 4
> > protocol over ICMP.
> >
> > The rule with layer 4 should be matched prior to the rule only with
> > layer 3 pattern when:
> >   1. Both rules are created in the same table
> >   2. Both rules could be hit
> >   3. The rules has the same priority
> >
> > The steering result of the packet is indeterministic if there are
> > rules with patterns IP and IP+ICMP in the same table with the same
> > priority. Like TCP / UDP, a packet should hit the rule with a longer
> > matching criterion.
> >
> > By treating the priority of ICMP/ICMPv6 as a layer 4 priority in the
> > PMD internally, the IP+ICMP will be hit in prior to IP only.
> >
> > Fixes: d53aa89aea91 ("net/mlx5: support matching on ICMP/ICMP6")
Added missing Cc: stable at dpdk.org
> >
> > Signed-off-by: Bing Zhao <bingz at nvidia.com>
> > Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
> 
> Patch applied to next-net-mlx,
> 
> Kindest regards,
> Raslan Darawsheh