svn commit: r267547 - head/sys/cam/ctl

[Edward Tomasz Napierala]

Author: trasz
Date: Mon Jun 16 18:14:05 2014
New Revision: 267547
URL: http://svnweb.freebsd.org/changeset/base/267547

Log:
  Add LUN-associated name to VPD, to make Hyper-V Failover Cluster happy.
  
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/cam/ctl/ctl_frontend_iscsi.c

Modified: head/sys/cam/ctl/ctl_frontend_iscsi.c
==============================================================================
--- head/sys/cam/ctl/ctl_frontend_iscsi.c	Mon Jun 16 16:37:41 2014	(r267546)
+++ head/sys/cam/ctl/ctl_frontend_iscsi.c	Mon Jun 16 18:14:05 2014	(r267547)
@@ -2033,13 +2033,13 @@ cfiscsi_devid(struct ctl_scsiio *ctsio, 
 {
 	struct cfiscsi_session *cs;
 	struct scsi_vpd_device_id *devid_ptr;
-	struct scsi_vpd_id_descriptor *desc, *desc1;
-	struct scsi_vpd_id_descriptor *desc2, *desc3; /* for types 4h and 5h */
+	struct scsi_vpd_id_descriptor *desc, *desc1, *desc2, *desc3, *desc4;
 	struct scsi_vpd_id_t10 *t10id;
 	struct ctl_lun *lun;
 	const struct icl_pdu *request;
+	int i, ret;
 	char *val;
-	size_t devid_len, wwpn_len;
+	size_t devid_len, wwpn_len, lun_name_len;
 
 	lun = (struct ctl_lun *)ctsio->io_hdr.ctl_private[CTL_PRIV_LUN].ptr;
 	request = ctsio->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
@@ -2051,9 +2051,20 @@ cfiscsi_devid(struct ctl_scsiio *ctsio, 
 	if ((wwpn_len % 4) != 0)
 		wwpn_len += (4 - (wwpn_len % 4));
 
+	if (lun == NULL) {
+		lun_name_len = 0;
+	} else {
+		lun_name_len = strlen(cs->cs_target->ct_name);
+		lun_name_len += strlen(",lun,XXXXXXXX");
+		lun_name_len += 1; /* '\0' */
+		if ((lun_name_len % 4) != 0)
+			lun_name_len += (4 - (lun_name_len % 4));
+	}
+
 	devid_len = sizeof(struct scsi_vpd_device_id) +
 		sizeof(struct scsi_vpd_id_descriptor) +
 		sizeof(struct scsi_vpd_id_t10) + CTL_DEVID_LEN +
+		sizeof(struct scsi_vpd_id_descriptor) + lun_name_len +
 		sizeof(struct scsi_vpd_id_descriptor) + wwpn_len +
 		sizeof(struct scsi_vpd_id_descriptor) +
 		sizeof(struct scsi_vpd_id_rel_trgt_port_id) +
@@ -2082,8 +2093,10 @@ cfiscsi_devid(struct ctl_scsiio *ctsio, 
 	desc1 = (struct scsi_vpd_id_descriptor *)(&desc->identifier[0] +
 	    sizeof(struct scsi_vpd_id_t10) + CTL_DEVID_LEN);
 	desc2 = (struct scsi_vpd_id_descriptor *)(&desc1->identifier[0] +
-	    wwpn_len);
+	    lun_name_len);
 	desc3 = (struct scsi_vpd_id_descriptor *)(&desc2->identifier[0] +
+	    wwpn_len);
+	desc4 = (struct scsi_vpd_id_descriptor *)(&desc3->identifier[0] +
 	    sizeof(struct scsi_vpd_id_rel_trgt_port_id));
 
 	if (lun != NULL)
@@ -2129,33 +2142,57 @@ cfiscsi_devid(struct ctl_scsiio *ctsio, 
 	}
 
 	/*
-	 * desc1 is for the WWPN which is a port asscociation.
+	 * desc1 is for the unique LUN name.
 	 */
-       	desc1->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
-	desc1->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
-	    SVPD_ID_TYPE_SCSI_NAME;
-	desc1->length = wwpn_len;
-	snprintf(desc1->identifier, wwpn_len, "%s,t,0x%4.4x",
-	    cs->cs_target->ct_name, cs->cs_portal_group_tag);
+	desc1->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
+	desc1->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_LUN |
+		SVPD_ID_TYPE_SCSI_NAME;
+	desc1->length = lun_name_len;
+	if (lun != NULL) {
+		/*
+		 * Find the per-target LUN number.
+		 */
+		for (i = 0; i < CTL_MAX_LUNS; i++) {
+			if (cs->cs_target->ct_luns[i] == lun->lun)
+				break;
+		}
+		KASSERT(i < CTL_MAX_LUNS,
+		    ("lun %jd not found", (uintmax_t)lun->lun));
+		ret = snprintf(desc1->identifier, lun_name_len, "%s,lun,%d",
+		    cs->cs_target->ct_name, i);
+		KASSERT(ret > 0 && ret <= lun_name_len, ("bad snprintf"));
+	} else {
+		KASSERT(lun_name_len == 0, ("no lun, but lun_name_len != 0"));
+	}
 
 	/*
-	 * desc2 is for the Relative Target Port(type 4h) identifier
+	 * desc2 is for the WWPN which is a port asscociation.
 	 */
-       	desc2->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_BINARY;
+       	desc2->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_UTF8;
 	desc2->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
-	    SVPD_ID_TYPE_RELTARG;
-	desc2->length = 4;
-	desc2->identifier[3] = 1;
+	    SVPD_ID_TYPE_SCSI_NAME;
+	desc2->length = wwpn_len;
+	snprintf(desc2->identifier, wwpn_len, "%s,t,0x%4.4x",
+	    cs->cs_target->ct_name, cs->cs_portal_group_tag);
 
 	/*
-	 * desc3 is for the Target Port Group(type 5h) identifier
+	 * desc3 is for the Relative Target Port(type 4h) identifier
 	 */
        	desc3->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_BINARY;
 	desc3->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
-	    SVPD_ID_TYPE_TPORTGRP;
+	    SVPD_ID_TYPE_RELTARG;
 	desc3->length = 4;
 	desc3->identifier[3] = 1;
 
+	/*
+	 * desc4 is for the Target Port Group(type 5h) identifier
+	 */
+       	desc4->proto_codeset = (SCSI_PROTO_ISCSI << 4) | SVPD_ID_CODESET_BINARY;
+	desc4->id_type = SVPD_ID_PIV | SVPD_ID_ASSOC_PORT |
+	    SVPD_ID_TYPE_TPORTGRP;
+	desc4->length = 4;
+	desc4->identifier[3] = 1;
+
 	ctsio->scsi_status = SCSI_STATUS_OK;
 
 	ctsio->be_move_done = ctl_config_move_done;