netdev - Re: Question about TPA/HDS feature of bnxt

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Message-ID: <CACKFLikxTXW4xg8vz7-NfModfn-ymf=a4pL6BtM8LebOmPsdfw@mail.gmail.com>
Date: Wed, 14 Aug 2024 10:17:46 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: Taehee Yoo <ap420073@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>, David Wei <dw@...idwei.uk>, 
	Somnath Kotur <somnath.kotur@...adcom.com>, Mina Almasry <almasrymina@...gle.com>, 
	Netdev <netdev@...r.kernel.org>
Subject: Re: Question about TPA/HDS feature of bnxt_en

On Wed, Aug 14, 2024 at 12:51 AM Taehee Yoo <ap420073@...il.com> wrote:
>
> On Wed, Aug 14, 2024 at 11:08 AM Michael Chan <michael.chan@...adcom.com> wrote:
> > Yes, the rx_copy_thresh is also the HDS threshold. The default value
> > is 256, meaning that packet sizes below 256 will not be split. So a
> > 300-byte packet should be split.
> >
> > TPA is related but is separate. There is a min_agg_len that is
> > currently set to 512 in bnxt_hwrm_vnic_set_tpa(). I think it should
> > be fine to reduce this value for TPA to work on smaller packets.
>
> Thank you so much for confirming the hds_threshold variable.
> I tested this variable, it worked as I expected.
> For testing, I kept the rx_copy_threshold and tpa settings unchanged,
> but modified the hds_threshold variable to 0.
>
> BTW, how about separating rx_copy_threshold into rx-copy-break
> and hds_threshold?
> If so, we can implement `ethtool --set-tunable eth0 rx-copybreak N`
> and `ethtool -G  eth0 tcp-data-split on`
>
Yes, we can do that.  I have the rx-copybreak tunable implemented in
the OOT driver already and can be sent upstream.  tcp_data_split can
also be added.  Thanks.

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