Re: [dpdk-dev] [PATCH v4 1/3] net/mlx5: add a devarg to specify MPRQ stride size

[Thomas Monjalon <thomas@monjalon.net>]

14/04/2020 13:42, Ferruh Yigit:
> On 4/9/2020 11:23 PM, Alexander Kozyrev wrote:
> > Define a device parameter to configure log 2 of a stride size for MPRQ
> > - mprq_log_stride_size. User is able to specify a stride size in a range
> > allowed by an underlying hardware. The default stride size is defined as
> > 2048 bytes to encompass most commonly used packet sizes in the Internet
> > (MTU 1518 and less) and will be used in case a maximum configured packet
> > size cannot fit into the largest possible stride size. Otherwise a
> > stride size is set to a large enough value to encompass a whole packet.
> > 
> > Cc: stable@dpdk.org
> 
> Hi Alexander,
> 
> This is a new feature, and you are asking it for to be backported to the stable
> trees.
> 
> There is no question on getting the fixes to the stable tree, but for
> backporting features I would like to get the comment of the stable tree
> maintainers first before merging the series.

As far as I know, there is a fix hidden in this series,
for the case of jumbo frames.
In my understanding, jumbo frames cannot be fixed without a new option.
I agree it's tricky deciding what is the limit with backports.