linux-kernel - Re: [PATCH net-next v3 1/3] vsock/virtio: use skb_frag

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Message-ID: <6584731f9eab1_82de3294d0@willemb.c.googlers.com.notmuch>
Date: Thu, 21 Dec 2023 12:17:19 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Mina Almasry <almasrymina@...gle.com>, 
 linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, 
 kvm@...r.kernel.org, 
 virtualization@...ts.linux.dev
Cc: Mina Almasry <almasrymina@...gle.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Stefan Hajnoczi <stefanha@...hat.com>, 
 Stefano Garzarella <sgarzare@...hat.com>, 
 David Howells <dhowells@...hat.com>, 
 Jason Gunthorpe <jgg@...dia.com>, 
 Christian König <christian.koenig@....com>, 
 Shakeel Butt <shakeelb@...gle.com>, 
 Yunsheng Lin <linyunsheng@...wei.com>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH net-next v3 1/3] vsock/virtio: use skb_frag_*() helpers

Mina Almasry wrote:
> Minor fix for virtio: code wanting to access the fields inside an skb
> frag should use the skb_frag_*() helpers, instead of accessing the
> fields directly. This allows for extensions where the underlying
> memory is not a page.
> 
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> 
> ---
> 
> v2:
> 
> - Also fix skb_frag_off() + skb_frag_size() (David)
> - Did not apply the reviewed-by from Stefano since the patch changed
> relatively much.
> 
> ---
>  net/vmw_vsock/virtio_transport.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index f495b9e5186b..1748268e0694 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -153,10 +153,10 @@ virtio_transport_send_pkt_work(struct work_struct *work)
>  				 * 'virt_to_phys()' later to fill the buffer descriptor.
>  				 * We don't touch memory at "virtual" address of this page.
>  				 */
> -				va = page_to_virt(skb_frag->bv_page);
> +				va = page_to_virt(skb_frag_page(skb_frag));
>  				sg_init_one(sgs[out_sg],
> -					    va + skb_frag->bv_offset,
> -					    skb_frag->bv_len);
> +					    va + skb_frag_off(skb_frag),
> +					    skb_frag_size(skb_frag));
>  				out_sg++;
>  			}
>  		}

If there are requests for further revision in the series, can send
this virtio cleanup on its own to get it off the stack.

> -- 
> 2.43.0.472.g3155946c3a-goog
>