[fc] Allow FLOGI response to be sent to newly-assigned peer port ID

The response to a received FLOGI should probably be sent to the peer
port ID assigned as a result of the WWPN comparison.

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

src/include/ipxe/fc.h

 #include <ipxe/tables.h>
 #include <ipxe/interface.h>
 #include <ipxe/retry.h>
+#include <ipxe/socket.h>
 
 /******************************************************************************
  *
 /** Length of Fibre Channel port identifier next */
 #define FC_PORT_ID_STRLEN 9 /* "xx.xx.xx" */
 
+/**
+ * Fibre Channel socket address
+ */
+struct sockaddr_fc {
+	/** Socket address family (part of struct @c sockaddr)
+	 *
+	 * Always set to @c AF_FC for Fibre Channel addresses
+	 */
+	sa_family_t sfc_family;
+	/** Port ID */
+	struct fc_port_id sfc_port_id;
+	/** Padding
+	 *
+	 * This ensures that a struct @c sockaddr_tcpip is large
+	 * enough to hold a socket address for any TCP/IP address
+	 * family.
+	 */
+	char pad[ sizeof ( struct sockaddr ) - sizeof ( sa_family_t )
+					     - sizeof ( struct fc_port_id ) ];
+} __attribute__ (( may_alias ));
+
 extern struct fc_port_id fc_empty_port_id;
 extern struct fc_port_id fc_f_port_id;
 extern struct fc_port_id fc_ptp_low_port_id;

src/include/ipxe/socket.h

  */
 #define AF_INET		1	/**< IPv4 Internet addresses */
 #define AF_INET6	2	/**< IPv6 Internet addresses */
+#define AF_FC		3	/**< Fibre Channel addresses */
 /** @} */
 
 /**

src/net/fc.c

 static int fc_xchg_tx ( struct fc_exchange *xchg, struct io_buffer *iobuf,
 			struct xfer_metadata *meta ) {
 	struct fc_port *port = xchg->port;
+	struct sockaddr_fc *dest = ( ( struct sockaddr_fc * ) meta->dest );
 	struct fc_frame_header *fchdr;
 	unsigned int r_ctl;
 	unsigned int f_ctl_es;
 	fchdr = iob_push ( iobuf, sizeof ( *fchdr ) );
 	memset ( fchdr, 0, sizeof ( *fchdr ) );
 	fchdr->r_ctl = r_ctl;
-	memcpy ( &fchdr->d_id, &xchg->peer_port_id, sizeof ( fchdr->d_id ) );
+	memcpy ( &fchdr->d_id,
+		 ( dest ? &dest->sfc_port_id : &xchg->peer_port_id ),
+		 sizeof ( fchdr->d_id ) );
 	memcpy ( &fchdr->s_id, &port->port_id, sizeof ( fchdr->s_id ) );
 	fchdr->type = xchg->type;
 	fchdr->f_ctl_es = f_ctl_es;

src/net/fcels.c

  * @ret rc		Return status code
  */
 int fc_els_tx ( struct fc_els *els, const void *data, size_t len ) {
-	struct xfer_metadata meta = {
-		.flags = ( fc_els_is_request ( els ) ?
-			   XFER_FL_OVER : ( XFER_FL_RESPONSE | XFER_FL_OUT ) ),
-	};
+	union {
+		struct sockaddr sa;
+		struct sockaddr_fc fc;
+	} dest;
+	struct xfer_metadata meta;
 	int rc;
 
 	DBGC2 ( els, FCELS_FMT " transmitting:\n", FCELS_ARGS ( els ) );
 	DBGC2_HDA ( els, 0, data, len );
 
+	/* Construct metadata */
+	memset ( &dest, 0, sizeof ( dest ) );
+	dest.fc.sfc_family = AF_FC;
+	memcpy ( &dest.fc.sfc_port_id, &els->peer_port_id,
+		 sizeof ( dest.fc.sfc_port_id ) );
+	memset ( &meta, 0, sizeof ( meta ) );
+	meta.flags = ( fc_els_is_request ( els ) ?
+		       XFER_FL_OVER : ( XFER_FL_RESPONSE | XFER_FL_OUT ) );
+	meta.dest = &dest.sa;
+
 	/* Transmit frame */
 	if ( ( rc = xfer_deliver_raw_meta ( &els->xchg, data, len,
 					    &meta ) ) != 0 ) {
 		return rc;
 	}
 
+	/* Send any responses to the newly-assigned peer port ID, if
+	 * applicable.
+	 */
+	if ( ! has_fabric ) {
+		memcpy ( &els->peer_port_id, &els->port->ptp_link_port_id,
+			 sizeof ( els->peer_port_id ) );
+	}
+
 	return 0;
 }