netdev - Re: [PATCH net-next v9 7/9] gve: add netmem TX support to GVE DQO-RDA mode

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Message-ID: <CAEAWyHf7Qzi8CDBeRMB5nMvvNawrFrUCh52k4JevbSHX1Y=zcw@mail.gmail.com>
Date: Tue, 22 Apr 2025 16:00:42 -0700
From: Harshitha Ramamurthy <hramamurthy@...gle.com>
To: Mina Almasry <almasrymina@...gle.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, io-uring@...r.kernel.org, 
	virtualization@...ts.linux.dev, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Simon Horman <horms@...nel.org>, Donald Hunter <donald.hunter@...il.com>, 
	Jonathan Corbet <corbet@....net>, Andrew Lunn <andrew+netdev@...n.ch>, 
	Jeroen de Borst <jeroendb@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Willem de Bruijn <willemb@...gle.com>, Jens Axboe <axboe@...nel.dk>, 
	Pavel Begunkov <asml.silence@...il.com>, David Ahern <dsahern@...nel.org>, 
	Neal Cardwell <ncardwell@...gle.com>, "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez <eperezma@...hat.com>, 
	Stefan Hajnoczi <stefanha@...hat.com>, Stefano Garzarella <sgarzare@...hat.com>, Shuah Khan <shuah@...nel.org>, 
	sdf@...ichev.me, dw@...idwei.uk, Jamal Hadi Salim <jhs@...atatu.com>, 
	Victor Nogueira <victor@...atatu.com>, Pedro Tammela <pctammela@...atatu.com>, 
	Samiullah Khawaja <skhawaja@...gle.com>
Subject: Re: [PATCH net-next v9 7/9] gve: add netmem TX support to GVE DQO-RDA mode

On Tue, Apr 22, 2025 at 2:30 PM Mina Almasry <almasrymina@...gle.com> wrote:
>
> On Tue, Apr 22, 2025 at 10:43 AM Harshitha Ramamurthy
> <hramamurthy@...gle.com> wrote:
> >
> > On Thu, Apr 17, 2025 at 4:15 PM Mina Almasry <almasrymina@...gle.com> wrote:
> > >
> > > Use netmem_dma_*() helpers in gve_tx_dqo.c DQO-RDA paths to
> > > enable netmem TX support in that mode.
> > >
> > > Declare support for netmem TX in GVE DQO-RDA mode.
> > >
> > > Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> > >
> > > ---
> > >
> > > v4:
> > > - New patch
> > > ---
> > >  drivers/net/ethernet/google/gve/gve_main.c   | 4 ++++
> > >  drivers/net/ethernet/google/gve/gve_tx_dqo.c | 8 +++++---
> > >  2 files changed, 9 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
> > > index 8aaac9101377..430314225d4d 100644
> > > --- a/drivers/net/ethernet/google/gve/gve_main.c
> > > +++ b/drivers/net/ethernet/google/gve/gve_main.c
> > > @@ -2665,6 +2665,10 @@ static int gve_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> > >
> > >         dev_info(&pdev->dev, "GVE version %s\n", gve_version_str);
> > >         dev_info(&pdev->dev, "GVE queue format %d\n", (int)priv->queue_format);
> > > +
> > > +       if (!gve_is_gqi(priv) && !gve_is_qpl(priv))
> > > +               dev->netmem_tx = true;
> > > +
> >
> > a nit: but it would fit in better and be more uniform if this is set
> > earlier in the function where other features are set for the
> > net_device.
> >
>
> Thanks for taking a look. I actually thought about that while trying
> to implement this, but AFAIU (correct if wrong), gve_is_gqi and
> gve_is_qpl need priv to be initialized, so this feature set must be
> performed after gve_init_priv in this function. I suppose this feature
> checking maybe can be put before register_netdev. Do you prefer that?

Ah yes, you are right. Thanks for checking. That would be preferable.
Another option is to move it inside gve_init_priv() after the mode has
been set. Either is okay.

Thanks,
Harshitha
>
>
> --
> Thanks,
> Mina