linux-kernel - Re: [RFC PATCH net-next v1 1/4] vsock/virtio: use skb_frag

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Date:   Thu, 14 Dec 2023 09:19:09 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Mina Almasry <almasrymina@...gle.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
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Subject: Re: [RFC PATCH net-next v1 1/4] vsock/virtio: use skb_frag_page()
 helper

On Wed, Dec 13, 2023 at 06:05:24PM -0800, Mina Almasry wrote:
>Minor fix for virtio: code wanting to access the page inside
>the skb should use skb_frag_page() helper, instead of accessing
>bv_page directly. This allows for extensions where the underlying
>memory is not a page.
>
>Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>
>---
> net/vmw_vsock/virtio_transport.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

LGTM!

Acked-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index af5bab1acee1..bd0b413dfa3f 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -153,7 +153,7 @@ 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);
>-- 
>2.43.0.472.g3155946c3a-goog
>