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be2net: Allow GRE to work concurrently while a VxLAN tunnel is configured 

Other tunnels like GRE break while VxLAN offloads are enabled in Skyhawk-R. To
avoid this, we should restrict offload features on a per-packet basis in such
conditions.

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sriharsha Basavapatna 2015-01-15 16:08:43 +05:30 committed by David S. Miller
parent a6391a924c
commit 16dde0d6ac
1 changed files with 38 additions and 3 deletions
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41
drivers/net/ethernet/emulex/benet/be_main.c
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@ -4383,8 +4383,9 @@ static int be_ndo_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
* distinguish various types of transports (VxLAN, GRE, NVGRE ..). So, offload
* is expected to work across all types of IP tunnels once exported. Skyhawk
* supports offloads for either VxLAN or NVGRE, exclusively. So we export VxLAN
* offloads in hw_enc_features only when a VxLAN port is added. Note this only
* ensures that other tunnels work fine while VxLAN offloads are not enabled.
* offloads in hw_enc_features only when a VxLAN port is added. If other (non
* VxLAN) tunnels are configured while VxLAN offloads are enabled, offloads for
* those other tunnels are unexported on the fly through ndo_features_check().
*
* Skyhawk supports VxLAN offloads only for one UDP dport. So, if the stack
* adds more than one port, disable offloads and don't re-enable them again
@ -4463,7 +4464,41 @@ static netdev_features_t be_features_check(struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features)
{
return vxlan_features_check(skb, features);
struct be_adapter *adapter = netdev_priv(dev);
u8 l4_hdr = 0;
/* The code below restricts offload features for some tunneled packets.
* Offload features for normal (non tunnel) packets are unchanged.
*/
if (!skb->encapsulation ||
!(adapter->flags & BE_FLAGS_VXLAN_OFFLOADS))
return features;
/* It's an encapsulated packet and VxLAN offloads are enabled. We
* should disable tunnel offload features if it's not a VxLAN packet,
* as tunnel offloads have been enabled only for VxLAN. This is done to
* allow other tunneled traffic like GRE work fine while VxLAN
* offloads are configured in Skyhawk-R.
*/
switch (vlan_get_protocol(skb)) {
case htons(ETH_P_IP):
l4_hdr = ip_hdr(skb)->protocol;
break;
case htons(ETH_P_IPV6):
l4_hdr = ipv6_hdr(skb)->nexthdr;
break;
default:
return features;
}
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);
return features;
}
#endif