Can now both send and receive packets. LL header format not yet

fixed; still using a quick hack-up just to be able to pass through
data.

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