[infiniband] Add the notion of an Ethernet queue pair type

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

src/drivers/net/ipoib.c

 	struct ipoib_mac ll_src;
 	struct ipoib_peer *src;
 
+	/* Record errors */
 	if ( rc != 0 ) {
 		netdev_rx_err ( netdev, iobuf, rc );
 		return;
 		return;
 	}
 	ipoib_hdr = iobuf->data;
+	if ( ! av ) {
+		DBGC ( ipoib, "IPoIB %p received packet without address "
+		       "vector\n", ipoib );
+		netdev_rx_err ( netdev, iobuf, -ENOTTY );
+		return;
+	}
 
 	/* Parse source address */
 	if ( av->gid_present ) {

src/include/ipxe/infiniband.h

 	IB_QPT_GSI,
 	IB_QPT_UD,
 	IB_QPT_RC,
+	IB_QPT_ETH,
 };
 
 /** An Infiniband Queue Pair */

src/net/infiniband.c

  *
  * @v ibdev		Infiniband device
  * @v qp		Queue pair
- * @v av		Address vector
+ * @v av		Address vector, or NULL
  * @v iobuf		I/O buffer
  * @v rc		Completion status code
  */