Commit fe3a5f6c authored by Simon Horman's avatar Simon Horman Committed by David S. Miller

openvswitch: allow output of MPLS packets on tunnel vports

Currently output of MPLS packets on tunnel vports is not allowed by Open
vSwitch. This is because historically encapsulation was done in such a way
that the inner_protocol field of the skb needed to hold the inner protocol
for both MPLS and tunnel encapsulation in order for GSO segmentation to be
performed correctly.

Since b2acd1dc ("openvswitch: Use regular GRE net_device instead of
vport") Open vSwitch makes use of lwt to output to tunnel netdevs which
perform encapsulation. As no drivers expose support for MPLS offloads this
means that GSO packets are segmented in software by validate_xmit_skb(),
which is called from __dev_queue_xmit(), before tunnel encapsulation occurs.
This means that the inner protocol of MPLS is no longer needed by the time
encapsulation occurs and the contention on the inner_protocol field of the
skb no longer occurs.

Thus it is now safe to output MPLS to tunnel vports.
Signed-off-by: default avatarSimon Horman <simon.horman@netronome.com>
Reviewed-by: default avatarJesse Gross <jesse@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d07a147f
...@@ -2044,9 +2044,6 @@ static int validate_set(const struct nlattr *a, ...@@ -2044,9 +2044,6 @@ static int validate_set(const struct nlattr *a,
break; break;
case OVS_KEY_ATTR_TUNNEL: case OVS_KEY_ATTR_TUNNEL:
if (eth_p_mpls(eth_type))
return -EINVAL;
if (masked) if (masked)
return -EINVAL; /* Masked tunnel set not supported. */ return -EINVAL; /* Masked tunnel set not supported. */
......
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