Subject: Re: [PATCH net-next v20 10/12] virtio_net: Add support for IPv6 ethtool steering

From: "Michael S. Tsirkin" <[email-masked]>
Date: Sun, 8 Feb 2026 05:08:56 -0500

> @@ -6111,20 +6176,38 @@ static int setup_ip_key_mask(struct virtio_net_ff_selector *selector,
>  			     u8 *key,
>  			     const struct ethtool_rx_flow_spec *fs)
>  {
> +	struct ipv6hdr *v6_m = (struct ipv6hdr *)&selector->mask;
>  	struct iphdr *v4_m = (struct iphdr *)&selector->mask;
> +	struct ipv6hdr *v6_k = (struct ipv6hdr *)key;
>  	struct iphdr *v4_k = (struct iphdr *)key;
>  
> -	selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV4;
> -	selector->length = sizeof(struct iphdr);
> +	if (has_ipv6(fs->flow_type)) {
> +		selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV6;
> +		selector->length = sizeof(struct ipv6hdr);
> +
> +		/* exclude tclass, it's not exposed properly struct ip6hdr */

do you mean:

+		/* exclude tclass, it's not exposed properly in struct ipv6hdr */

?

and maybe properly -> directly?

> +		if (fs->h_u.usr_ip6_spec.l4_4_bytes ||
> +		    fs->m_u.usr_ip6_spec.l4_4_bytes ||
> +		    fs->h_u.usr_ip6_spec.tclass ||
> +		    fs->m_u.usr_ip6_spec.tclass ||
> +		    fs->h_u.usr_ip6_spec.l4_proto ||
> +		    fs->m_u.usr_ip6_spec.l4_proto)
> +			return -EINVAL;
>  
> -	if (fs->h_u.usr_ip4_spec.l4_4_bytes ||
> -	    fs->h_u.usr_ip4_spec.ip_ver != ETH_RX_NFC_IP4 ||
> -	    fs->m_u.usr_ip4_spec.l4_4_bytes ||
> -	    fs->m_u.usr_ip4_spec.ip_ver ||
> -	    fs->m_u.usr_ip4_spec.proto)
> -		return -EINVAL;
> +		parse_ip6(v6_m, v6_k, fs);
> +	} else {
> +		selector->type = VIRTIO_NET_FF_MASK_TYPE_IPV4;
> +		selector->length = sizeof(struct iphdr);
> +
> +		if (fs->h_u.usr_ip4_spec.l4_4_bytes ||
> +		    fs->h_u.usr_ip4_spec.ip_ver != ETH_RX_NFC_IP4 ||
> +		    fs->m_u.usr_ip4_spec.l4_4_bytes ||
> +		    fs->m_u.usr_ip4_spec.ip_ver ||
> +		    fs->m_u.usr_ip4_spec.proto)
> +			return -EINVAL;
>  
> -	parse_ip4(v4_m, v4_k, fs);
> +		parse_ip4(v4_m, v4_k, fs);
> +	}
>  
>  	return 0;
>  }
> @@ -6194,7 +6277,7 @@ static int build_and_insert(struct virtnet_ff *ff,
>  
>  	setup_eth_hdr_key_mask(selector, key, fs, num_hdrs);
>  
> -	if (has_ipv4(fs->flow_type)) {
> +	if (has_ipv4(fs->flow_type) || has_ipv6(fs->flow_type)) {
>  		selector = next_selector(selector);
>  
>  		err = setup_ip_key_mask(selector, key + sizeof(struct ethhdr), fs);
> -- 
> 2.50.1