Subject: Re: [PATCH v5 3/4] drivers/net/virtio_net: Added RSS hash report.

From: "Michael S. Tsirkin" <[email-masked]>
Date: Thu, 11 Aug 2022 04:53:08 -0400

On Mon, Mar 28, 2022 at 08:53:35PM +0300, Andrew Melnychenko wrote:
> +static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
> +				struct sk_buff *skb)
> +{
> +	enum pkt_hash_types rss_hash_type;
> +
> +	if (!hdr_hash || !skb)
> +		return;
> +
> +	switch ((int)hdr_hash->hash_report) {
> +	case VIRTIO_NET_HASH_REPORT_TCPv4:
> +	case VIRTIO_NET_HASH_REPORT_UDPv4:
> +	case VIRTIO_NET_HASH_REPORT_TCPv6:
> +	case VIRTIO_NET_HASH_REPORT_UDPv6:
> +	case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
> +	case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
> +		rss_hash_type = PKT_HASH_TYPE_L4;
> +		break;
> +	case VIRTIO_NET_HASH_REPORT_IPv4:
> +	case VIRTIO_NET_HASH_REPORT_IPv6:
> +	case VIRTIO_NET_HASH_REPORT_IPv6_EX:
> +		rss_hash_type = PKT_HASH_TYPE_L3;
> +		break;
> +	case VIRTIO_NET_HASH_REPORT_NONE:
> +	default:
> +		rss_hash_type = PKT_HASH_TYPE_NONE;
> +	}
> +	skb_set_hash(skb, (unsigned int)hdr_hash->hash_value, rss_hash_type);
> +}
> +
>  static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
>  			void *buf, unsigned int len, void **ctx,
>  			unsigned int *xdp_xmit,

I just noticed this- endian-ness broken here, you need _le16_to_cpu for
hash_report and __le_32_to_cpu for hash_value.

-- 
MST