netdev - Re: [PATCH net-next v5 5/7] bnxt_en: add support for header-data-split-thresh ethtool command

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Message-ID: <CACKFLimmY1CBdu9VhG6nUd=o4DjdQwxHVHxbnky7qUWhZK9KDw@mail.gmail.com>
Date: Thu, 14 Nov 2024 16:27:27 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc: Taehee Yoo <ap420073@...il.com>, davem@...emloft.net, kuba@...nel.org, 
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Subject: Re: [PATCH net-next v5 5/7] bnxt_en: add support for
 header-data-split-thresh ethtool command

On Thu, Nov 14, 2024 at 2:54 PM Andy Gospodarek
<andrew.gospodarek@...adcom.com> wrote:
>
> On Wed, Nov 13, 2024 at 05:32:19PM +0000, Taehee Yoo wrote:
> > The bnxt_en driver has configured the hds_threshold value automatically
> > when TPA is enabled based on the rx-copybreak default value.
> > Now the header-data-split-thresh ethtool command is added, so it adds an
> > implementation of header-data-split-thresh option.
> >
> > Configuration of the header-data-split-thresh is allowed only when
> > the header-data-split is enabled. The default value of
> > header-data-split-thresh is 256, which is the default value of
> > rx-copybreak, which used to be the hds_thresh value.
> >
> >    # Example:
> >    # ethtool -G enp14s0f0np0 tcp-data-split on header-data-split-thresh 256
> >    # ethtool -g enp14s0f0np0
> >    Ring parameters for enp14s0f0np0:
> >    Pre-set maximums:
> >    ...
> >    Header data split thresh:  256
> >    Current hardware settings:
> >    ...
> >    TCP data split:         on
> >    Header data split thresh:  256
> >
> > Tested-by: Stanislav Fomichev <sdf@...ichev.me>
> > Signed-off-by: Taehee Yoo <ap420073@...il.com>
>
> Tested-by: Andy Gospodarek <gospo@...adcom.com>
>

> > @@ -2362,6 +2362,8 @@ struct bnxt {
> >       u8                      q_ids[BNXT_MAX_QUEUE];
> >       u8                      max_q;
> >       u8                      num_tc;
> > +#define BNXT_HDS_THRESHOLD_MAX       256

As mentioned in my comments for patch #1, our NIC can support HDS
threshold of up to 1023, so we can set this to 1023.  Thanks.

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