IB/ipoib: Filter RX packets before adding pseudo header

IB/ipoib: Filter RX packets before adding pseudo header

IB-ACL filtering is based on SGID (carried in the GRH).
The function skb_add_pseudo_hdr clears the SGID from the header.

Doing filtering after this call has no effect since all packets will drop
for not having SGID in.

Fix this by moving the call to skb_add_pseudo_hdr to be after IB-ACL
filtering while still adjusting skb->data as needed for the filtering.

Orabug: 28655409

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>