[dpdk-dev] [PATCH v2] net/mlx5: do not allow copy to mark via modify field

[Slava Ovsiienko]

> -----Original Message-----
> From: Alexander Kozyrev <akozyrev at nvidia.com>
> Sent: Friday, July 16, 2021 11:43
> To: dev at dpdk.org
> Cc: Raslan Darawsheh <rasland at nvidia.com>; Matan Azrad
> <matan at nvidia.com>; Slava Ovsiienko <viacheslavo at nvidia.com>
> Subject: [PATCH v2] net/mlx5: do not allow copy to mark via modify field
> 
> The Mark action is a two-stage process in the Mellanox driver.
> First, a hardware register is filled with the required value, then this value is
> registered in the software resource table.
> 
> The MODIFY_FIELD action can instruct a Mellanox NIC to copy some value
> from an arbitrary packet header field into the hardware register, associated
> with the Mark item. But there is no way NIC can modify the software
> resource table as well.
> 
> Due to these driver limitations the copying of arbitrary value to the MARK can
> not be supported and should be rejected in the MODIFY_FIELD action.
> 
Thank you, Alexander

> Signed-off-by: Alexander Kozyrev <akozyrev at nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>