netdev - [Question] vxlan_features

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Date:	Sat, 10 Jan 2015 06:52:22 +0000
From:	Sriharsha Basavapatna <Sriharsha.Basavapatna@...lex.Com>
To:	Jesse Gross <jesse@...ira.com>, Tom Herbert <therbert@...gle.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [Question] vxlan_features_check()

Hi Jesse, Tom,

The current implementation of vxlan_features_check() disables csum/gso flags
for only a subset of Non-VxLAN tunnels - those with tunnel outer transport type
of UDP. Is there any reason why this was not done for non-UDP tunnels like
GRE too ? This can avoid additional code in the driver ndo_features_check()
to disable those flags for non-UDP tunnels.  Please let me know if I'm
missing something here.

The current code in vxlan_features_check() is this:
        if ((l4_hdr == IPPROTO_UDP) &&
            (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
             skb->inner_protocol != htons(ETH_P_TEB) ||
             (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
              sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
                return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);

That should change to:
        if (l4_hdr != IPPROTO_UDP ||
            skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
            skb->inner_protocol != htons(ETH_P_TEB) ||
            (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
            sizeof(struct udphdr) + sizeof(struct vxlanhdr)))
                return features & ~(NETIF_F_ALL_CSUM | NETIF_F_GSO_MASK);

Thanks,
-Harsha


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