IB/ipoib: Check gso size prior to ib_send

IB/ipoib: Check gso size prior to ib_send

We found that in some cases the kernel sends skb where the
gso field was damaged, and the size of that field was bigger
than the physical mtu, when the HW gets such size it flushes
the qp to error state and all traffic on that interface is
disabled.

In order to avoid such case, i added a check to that field
prior to the ib_send.

Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
(Ported from Mellanox OFED 2.4)

Signed-off-by: Mukesh Kacker <mukesh.kacker@oracle.com>