[scsi] Generalise iscsi_parse_lun() to scsi_parse_lun()

src/drivers/block/scsi.c

 FILE_LICENCE ( GPL2_OR_LATER );
 
 #include <stddef.h>
+#include <stdlib.h>
 #include <string.h>
 #include <byteswap.h>
 #include <errno.h>
 
 	return 0;
 }
+
+/**
+ * Parse SCSI LUN
+ *
+ * @v lun_string	LUN string representation
+ * @v lun		LUN to fill in
+ * @ret rc		Return status code
+ */
+int scsi_parse_lun ( const char *lun_string, struct scsi_lun *lun ) {
+	char *p;
+	int i;
+
+	memset ( lun, 0, sizeof ( *lun ) );
+	if ( lun_string ) {
+		p = ( char * ) lun_string;
+		for ( i = 0 ; i < 4 ; i++ ) {
+			lun->u16[i] = htons ( strtoul ( p, &p, 16 ) );
+			if ( *p == '\0' )
+				break;
+			if ( *p != '-' )
+				return -EINVAL;
+			p++;
+		}
+		if ( *p )
+			return -EINVAL;
+	}
+
+	return 0;
+}

src/include/gpxe/iscsi.h

 	/** Segment lengths */
 	union iscsi_segment_lengths lengths;
 	/** SCSI Logical Unit Number */
-	uint64_t lun;
+	struct scsi_lun lun;
 	/** Initiator Task Tag */
 	uint32_t itt;
 	/** Expected data transfer length */
 	/** Segment lengths */
 	union iscsi_segment_lengths lengths;
 	/** Logical Unit Number */
-	uint64_t lun;
+	struct scsi_lun lun;
 	/** Initiator Task Tag */
 	uint32_t itt;
 	/** Target Transfer Tag */
 	/** Segment lengths */
 	union iscsi_segment_lengths lengths;
 	/** Logical Unit Number */
-	uint64_t lun;
+	struct scsi_lun lun;
 	/** Initiator Task Tag */
 	uint32_t itt;
 	/** Target Transfer Tag */
 	/** Segment lengths */
 	union iscsi_segment_lengths lengths;
 	/** Logical Unit Number */
-	uint64_t lun;
+	struct scsi_lun lun;
 	/** Initiator Task Tag */
 	uint32_t itt;
 	/** Target Transfer Tag */
 	/** Target IQN */
 	char *target_iqn;
 	/** Logical Unit Number (LUN) */
-	uint64_t lun;
+	struct scsi_lun lun;
 	/** Target socket address (recorded only for iBFT) */
 	struct sockaddr target_sockaddr;
 

src/include/gpxe/scsi.h

 	int rc;
 };
 
+/** A SCSI LUN
+ *
+ * This is a four-level LUN as specified by SAM-2, in big-endian
+ * order.
+ */
+struct scsi_lun {
+	uint16_t u16[4];
+}  __attribute__ (( packed ));
+
 /** A SCSI device */
 struct scsi_device {
 	/** Block device interface */
 	struct block_device blockdev;
-	/** Logical unit number (LUN)
-	 *
-	 * This is a four-level LUN as specified by SAM-2, in
-	 * big-endian order.
-	 */
-	uint64_t lun;
+	/** Logical unit number (LUN) */
+	struct scsi_lun lun;
 	/**
 	 * Issue SCSI command
 	 *
 extern int scsi_detached_command ( struct scsi_device *scsi,
 				   struct scsi_command *command );
 extern int init_scsidev ( struct scsi_device *scsi );
+extern int scsi_parse_lun ( const char *lun_string, struct scsi_lun *lun );
 
 #endif /* _GPXE_SCSI_H */

src/net/tcp/iscsi.c

 	NUM_RP_COMPONENTS
 };
 
-/**
- * Parse iSCSI LUN
- *
- * @v iscsi		iSCSI session
- * @v lun_string	LUN string representation (as per RFC4173)
- * @ret rc		Return status code
- */
-static int iscsi_parse_lun ( struct iscsi_session *iscsi,
-			     const char *lun_string ) {
-	union {
-		uint64_t u64;
-		uint16_t u16[4];
-	} lun;
-	char *p;
-	int i;
-
-	memset ( &lun, 0, sizeof ( lun ) );
-	if ( lun_string ) {
-		p = ( char * ) lun_string;
-		
-		for ( i = 0 ; i < 4 ; i++ ) {
-			lun.u16[i] = htons ( strtoul ( p, &p, 16 ) );
-			if ( *p == '\0' )
-				break;
-			if ( *p != '-' )
-				return -EINVAL;
-			p++;
-		}
-		if ( *p )
-			return -EINVAL;
-	}
-
-	iscsi->lun = lun.u64;
-	return 0;
-}
-
 /**
  * Parse iSCSI root path
  *
 	iscsi->target_port = strtoul ( rp_comp[RP_PORT], NULL, 10 );
 	if ( ! iscsi->target_port )
 		iscsi->target_port = ISCSI_PORT;
-	if ( ( rc = iscsi_parse_lun ( iscsi, rp_comp[RP_LUN] ) ) != 0 ) {
+	if ( ( rc = scsi_parse_lun ( rp_comp[RP_LUN], &iscsi->lun ) ) != 0 ) {
 		DBGC ( iscsi, "iSCSI %p invalid LUN \"%s\"\n",
 		       iscsi, rp_comp[RP_LUN] );
 		return rc;