linux-kernel - Re: [PATCH net-next v3 0/6] Device memory TCP TX

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Message-ID: <20250204180605.268609c9@kernel.org>
Date: Tue, 4 Feb 2025 18:06:05 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Stanislav Fomichev <stfomichev@...il.com>
Cc: Mina Almasry <almasrymina@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, kvm@...r.kernel.org,
 virtualization@...ts.linux.dev, linux-kselftest@...r.kernel.org, Donald
 Hunter <donald.hunter@...il.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Simon Horman <horms@...nel.org>,
 Jonathan Corbet <corbet@....net>, Andrew Lunn <andrew+netdev@...n.ch>, Neal
 Cardwell <ncardwell@...gle.com>, David Ahern <dsahern@...nel.org>, "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, asml.silence@...il.com, 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 v3 0/6] Device memory TCP TX

On Tue, 4 Feb 2025 11:41:09 -0800 Stanislav Fomichev wrote:
> > > Don't we need some way for the device to opt-in (or opt-out) and avoid
> > > such issues?
> > >  
> > 
> > Yeah, I think likely the driver needs to declare support (i.e. it's
> > not using dma-mapping API with dma-buf addresses).  
> 
> netif_skb_features/ndo_features_check seems like a good fit?

validate_xmit_skb()