diff --git a/src/drivers/net/mlx_ipoib/ib_mt25218.c b/src/drivers/net/mlx_ipoib/ib_mt25218.c
index 631a95cb..dcd49e45 100644
--- a/src/drivers/net/mlx_ipoib/ib_mt25218.c
+++ b/src/drivers/net/mlx_ipoib/ib_mt25218.c
@@ -1587,12 +1587,14 @@ static void prep_send_wqe_buf(void *qph,
 	}
 	snd_wqe->mpointer[0].byte_count = cpu_to_be32(len);
 
+#if 0
 	DBG ( "prep_send_wqe_buf()\n" );
 	DBG ( "snd_wqe:\n" );
 	DBG_HD ( snd_wqe, sizeof ( *snd_wqe ) );
 	DBG ( "packet:\n" );
 	DBG_HD ( bus_to_virt(be32_to_cpu(snd_wqe->mpointer[0].local_addr_l)),
 		 len );
+#endif
 }
 
 static void *alloc_ud_av(void)
diff --git a/src/drivers/net/mlx_ipoib/mt25218.c b/src/drivers/net/mlx_ipoib/mt25218.c
index de91dac6..a468f160 100644
--- a/src/drivers/net/mlx_ipoib/mt25218.c
+++ b/src/drivers/net/mlx_ipoib/mt25218.c
@@ -248,13 +248,13 @@ static void mlx_poll ( struct net_device *netdev ) {
 	}
 	buf = get_rcv_wqe_buf(ib_cqe.wqe, 1);
 	memcpy ( iob_put ( iobuf, len ), buf, len );
-	DBG ( "Received packet header:\n" );
-	struct recv_wqe_st *rcv_wqe = ib_cqe.wqe;
-	DBG_HD ( get_rcv_wqe_buf(ib_cqe.wqe, 0),
-		 be32_to_cpu(rcv_wqe->mpointer[0].byte_count) );
+	//	DBG ( "Received packet header:\n" );
+	//	struct recv_wqe_st *rcv_wqe = ib_cqe.wqe;
+	//	DBG_HD ( get_rcv_wqe_buf(ib_cqe.wqe, 0),
+	//		 be32_to_cpu(rcv_wqe->mpointer[0].byte_count) );
 		 
-	DBG ( "Received packet:\n" );
-	DBG_HD ( iobuf->data, iob_len ( iobuf ) );
+	//	DBG ( "Received packet:\n" );
+	//	DBG_HD ( iobuf->data, iob_len ( iobuf ) );
 
 	netdev_rx ( netdev, iobuf );
 
@@ -392,6 +392,7 @@ static int mlx_probe ( struct pci_device *pci,
 		       const struct pci_device_id *id __unused ) {
 	struct net_device *netdev;
 	struct mlx_nic *mlx;
+	struct ib_mac *mac;
 	int rc;
 
 	/* Allocate net device */
@@ -410,7 +411,9 @@ static int mlx_probe ( struct pci_device *pci,
 	/* Initialise hardware */
 	if ( ( rc = ipoib_init ( pci ) ) != 0 )
 		goto err_ipoib_init;
-	memcpy ( netdev->ll_addr, ipoib_data.port_gid_raw, IB_ALEN );
+	mac = ( ( struct ib_mac * ) netdev->ll_addr );
+	mac->qpn = htonl ( ipoib_data.ipoib_qpn );
+	memcpy ( &mac->gid, ipoib_data.port_gid_raw, sizeof ( mac->gid ) );
 
 	/* Register network device */
 	if ( ( rc = register_netdev ( netdev ) ) != 0 )
diff --git a/src/include/gpxe/infiniband.h b/src/include/gpxe/infiniband.h
index 126113a7..11cec189 100644
--- a/src/include/gpxe/infiniband.h
+++ b/src/include/gpxe/infiniband.h
@@ -14,6 +14,43 @@
 #define IB_ALEN 20
 #define IB_HLEN 24
 
+/** An Infiniband Global Identifier */
+struct ib_gid {
+	uint8_t bytes[16];
+};
+
+/** An Infiniband Global Route Header */
+struct ib_global_route_header {
+	/** IP version, traffic class, and flow label
+	 *
+	 *  4 bits : Version of the GRH
+	 *  8 bits : Traffic class
+	 * 20 bits : Flow label
+	 */
+	uint32_t ipver_tclass_flowlabel;
+	/** Payload length */
+	uint16_t paylen;
+	/** Next header */
+	uint8_t nxthdr;
+	/** Hop limit */
+	uint8_t hoplmt;
+	/** Source GID */
+	struct ib_gid sgid;
+	/** Destiniation GID */
+	struct ib_gid dgid;
+} __attribute__ (( packed ));
+
+/** An Infiniband MAC address */
+struct ib_mac {
+	/** Queue pair number
+	 *
+	 * MSB must be zero; QPNs are only 24-bit.
+	 */
+	uint32_t qpn;
+	/** Port GID */
+	struct ib_gid gid;
+} __attribute__ (( packed ));
+
 /** An Infiniband header
  *
  * This data structure doesn't represent the on-wire format, but does
diff --git a/src/net/infiniband.c b/src/net/infiniband.c
index bcfac292..c7fabd0e 100644
--- a/src/net/infiniband.c
+++ b/src/net/infiniband.c
@@ -70,6 +70,17 @@ static int ib_tx ( struct io_buffer *iobuf, struct net_device *netdev,
  * network-layer protocol.
  */
 static int ib_rx ( struct io_buffer *iobuf, struct net_device *netdev ) {
+
+	struct {
+		uint16_t proto;
+		uint16_t reserved;
+	} * header = iobuf->data;
+
+	iob_pull ( iobuf, sizeof ( *header ) );
+	return net_rx ( iobuf, netdev, header->proto, NULL );
+
+
+
 	struct ibhdr *ibhdr = iobuf->data;
 
 	/* Sanity check */