Re: [dpdk-dev] [PATCH] net/mlx5: fix Tx metadata endianness in data path

[Thomas Monjalon <thomas@monjalon.net>]

27/09/2021 10:02, Bing Zhao:
> The metadata can be set in the mbuf dynamic field and then used in
> flow rules steering for egress direction. The hardware requires
> network order for both the insertion of a rule and sending a packet.
> Indeed, there is no strict restriction for the endianness. The order
> for sending a packet and its steering rule should be consistent.
> 
> In the past, there was no endianness conversion due to the
> performance reason. The flow rule converted the metadata into little
> endian for hardware (if needed) and the packet hit the flow rule also
> with little endian.
> 
> After the metadata was converted to big endian, the missing adaption
> in the data path resulted in a flow miss of the egress packets.
> 
> Converting the metadata to big endian before posting a WQE to the
> hardware solves this issue.
> 
> Fixes: b57e414b48c0 ("net/mlx5: convert meta register to big-endian")
> Cc: akozyrev@nvidia.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Bing Zhao <bingz@nvidia.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

Applied in next-net-mlx, thanks.