linux-kernel - Re: [PATCH v2 1/4] drivers/net/virtio_net: Fixed padded vheader to use v1 with hash.

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Date:   Thu, 27 Jan 2022 15:47:38 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Andrew Melnychenko <andrew@...nix.com>, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        mst@...hat.com
Cc:     yan@...nix.com, yuri.benditovich@...nix.com
Subject: Re: [PATCH v2 1/4] drivers/net/virtio_net: Fixed padded vheader to
 use v1 with hash.


在 2022/1/17 下午4:00, Andrew Melnychenko 写道:
> The header v1 provides additional info about RSS.
> Added changes to computing proper header length.
> In the next patches, the header may contain RSS hash info
> for the hash population.
>
> Signed-off-by: Andrew Melnychenko <andrew@...nix.com>


Acked-by: Jason Wang <jasowang@...hat.com>


> ---
>   drivers/net/virtio_net.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 569eecfbc2cd..05fe5ba32187 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -242,13 +242,13 @@ struct virtnet_info {
>   };
>   
>   struct padded_vnet_hdr {
> -	struct virtio_net_hdr_mrg_rxbuf hdr;
> +	struct virtio_net_hdr_v1_hash hdr;
>   	/*
>   	 * hdr is in a separate sg buffer, and data sg buffer shares same page
>   	 * with this header sg. This padding makes next sg 16 byte aligned
>   	 * after the header.
>   	 */
> -	char padding[4];
> +	char padding[12];
>   };
>   
>   static bool is_xdp_frame(void *ptr)
> @@ -1266,7 +1266,8 @@ static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
>   					  struct ewma_pkt_len *avg_pkt_len,
>   					  unsigned int room)
>   {
> -	const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
> +	struct virtnet_info *vi = rq->vq->vdev->priv;
> +	const size_t hdr_len = vi->hdr_len;
>   	unsigned int len;
>   
>   	if (room)
> @@ -2851,7 +2852,7 @@ static void virtnet_del_vqs(struct virtnet_info *vi)
>    */
>   static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
>   {
> -	const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
> +	const unsigned int hdr_len = vi->hdr_len;
>   	unsigned int rq_size = virtqueue_get_vring_size(vq);
>   	unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
>   	unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;