linux-kernel - Re: [PATCH v4 21/42] virtio_net: get rid of virtio_net_hdr/skb_vnet

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Message-ID: <20141126135053.1bf4f97c.cornelia.huck@de.ibm.com>
Date:	Wed, 26 Nov 2014 13:50:53 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	rusty@....ibm.com, nab@...ux-iscsi.org, pbonzini@...hat.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 21/42] virtio_net: get rid of
 virtio_net_hdr/skb_vnet_hdr

On Tue, 25 Nov 2014 18:42:53 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> virtio 1.0 doesn't use virtio_net_hdr anymore, and in fact, it's not
> really useful since virtio_net_hdr_mrg_rxbuf includes that as the first
> field anyway.
> 
> Let's drop it, precalculate header len and store within vi instead.
> 
> This way we can also remove struct skb_vnet_hdr.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/net/virtio_net.c | 90 ++++++++++++++++++++++--------------------------
>  1 file changed, 41 insertions(+), 49 deletions(-)
> 

> @@ -260,13 +256,11 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> 
>  	hdr = skb_vnet_hdr(skb);
> 
> -	if (vi->mergeable_rx_bufs) {
> -		hdr_len = sizeof hdr->mhdr;
> -		hdr_padded_len = sizeof hdr->mhdr;
> -	} else {
> -		hdr_len = sizeof hdr->hdr;
> +	hdr_len = vi->hdr_len;
> +	if (vi->mergeable_rx_bufs)
> +		hdr_padded_len = sizeof *hdr;

sizeof without () looks weird to me.

> +	else
>  		hdr_padded_len = sizeof(struct padded_vnet_hdr);
> -	}
> 
>  	memcpy(hdr, p, hdr_len);
> 

Otherwise:

Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>

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