[hermon] Work around hardware stripping of VLAN tags

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/infiniband/hermon.c

 #include <ipxe/if_ether.h>
 #include <ipxe/ethernet.h>
 #include <ipxe/fcoe.h>
+#include <ipxe/vlan.h>
 #include "hermon.h"
 
 /**
 		len = MLX_GET ( &cqe->normal, byte_cnt );
 		assert ( len <= iob_tailroom ( iobuf ) );
 		iob_put ( iobuf, len );
+		memset ( &recv_av, 0, sizeof ( recv_av ) );
 		switch ( qp->type ) {
 		case IB_QPT_SMI:
 		case IB_QPT_GSI:
 			iob_pull ( iobuf, sizeof ( *grh ) );
 			/* Construct address vector */
 			av = &recv_av;
-			memset ( av, 0, sizeof ( *av ) );
 			av->qpn = MLX_GET ( &cqe->normal, srq_rqpn );
 			av->lid = MLX_GET ( &cqe->normal, slid_smac47_32 );
 			av->sl = MLX_GET ( &cqe->normal, sl );
 			av = &qp->av;
 			break;
 		case IB_QPT_ETH:
-			av = NULL;
+			/* Construct address vector */
+			av = &recv_av;
+			av->vlan_present = MLX_GET ( &cqe->normal, vlan );
+			av->vlan = MLX_GET ( &cqe->normal, vid );
 			break;
 		default:
 			assert ( 0 );
  */
 static void hermon_eth_complete_recv ( struct ib_device *ibdev __unused,
 				       struct ib_queue_pair *qp,
-				       struct ib_address_vector *av __unused,
+				       struct ib_address_vector *av,
 				       struct io_buffer *iobuf, int rc ) {
 	struct net_device *netdev = ib_qp_get_ownerdata ( qp );
+	struct net_device *vlan;
+
+	/* Find VLAN device, if applicable */
+	if ( av->vlan_present ) {
+		if ( ( vlan = vlan_find ( netdev, av->vlan ) ) != NULL ) {
+			netdev = vlan;
+		} else if ( rc == 0 ) {
+			rc = -ENODEV;
+		}
+	}
 
 	/* Hand off to network layer */
 	if ( rc == 0 ) {

src/include/ipxe/infiniband.h

 	unsigned int gid_present;
 	/** GID, if present */
 	union ib_gid gid;
+	/** VLAN is present */
+	unsigned int vlan_present;
+	/** VLAN, if present */
+	unsigned int vlan;
 };
 
 /** An Infiniband Work Queue */