[SCSI] iscsi class, qla4xxx, iscsi_tcp, ib_iser: export/set initiator name

For iscsi root boot, software iscsi needs to know what the BIOS/OF
initiator used for the initiator name so this puts it in sysfs
for userspace to be able to pick up.

For hw iscsi, it is nice to see what the card is using.

This patch adds the new param, and hooks in qla4xxx, iscsi_tcp, and ib_iser.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: David C Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/infiniband/ulp/iser/iscsi_iser.c

@@ -576,7 +576,8 @@ static struct iscsi_transport iscsi_iser_transport = {
 				  ISCSI_PERSISTENT_ADDRESS |
 				  ISCSI_TARGET_NAME |
 				  ISCSI_TPGT,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS,
+	.host_param_mask	= ISCSI_HOST_HWADDRESS |
+				  ISCSI_HOST_INITIATOR_NAME,
 	.host_template          = &iscsi_iser_sht,
 	.conndata_size		= sizeof(struct iscsi_conn),
 	.max_lun                = ISCSI_ISER_MAX_LUN,

drivers/scsi/iscsi_tcp.c

@@ -2181,7 +2181,8 @@ static struct iscsi_transport iscsi_tcp_transport = {
 				  ISCSI_PERSISTENT_ADDRESS |
 				  ISCSI_TARGET_NAME |
 				  ISCSI_TPGT,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS,
+	.host_param_mask	= ISCSI_HOST_HWADDRESS |
+				  ISCSI_HOST_INITIATOR_NAME,
 	.host_template		= &iscsi_sht,
 	.conndata_size		= sizeof(struct iscsi_conn),
 	.max_conn		= 1,

drivers/scsi/libiscsi.c

@@ -1463,6 +1463,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
 
 	kfree(session->targetname);
 	kfree(session->hwaddress);
+	kfree(session->initiatorname);
 
 	iscsi_destroy_session(cls_session);
 	scsi_host_put(shost);
@@ -2004,6 +2005,13 @@ int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
 		else
 			len = sprintf(buf, "%s\n", session->hwaddress);
 		break;
+	case ISCSI_HOST_PARAM_INITIATOR_NAME:
+		if (!session->initiatorname)
+			len = sprintf(buf, "%s\n", "unknown");
+		else
+			len = sprintf(buf, "%s\n", session->initiatorname);
+		break;
+
 	default:
 		return -ENOSYS;
 	}
@@ -2022,6 +2030,10 @@ int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
 		if (!session->hwaddress)
 			session->hwaddress = kstrdup(buf, GFP_KERNEL);
 		break;
+	case ISCSI_HOST_PARAM_INITIATOR_NAME:
+		if (!session->initiatorname)
+			session->initiatorname = kstrdup(buf, GFP_KERNEL);
+		break;
 	default:
 		return -ENOSYS;
 	}

drivers/scsi/qla4xxx/ql4_os.c

@@ -104,7 +104,8 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
 	.name			= DRIVER_NAME,
 	.param_mask		= ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 				  ISCSI_TARGET_NAME | ISCSI_TPGT,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS,
+	.host_param_mask	= ISCSI_HOST_HWADDRESS |
+				  ISCSI_HOST_INITIATOR_NAME,
 	.sessiondata_size	= sizeof(struct ddb_entry),
 	.host_template		= &qla4xxx_driver_template,
 
@@ -190,6 +191,9 @@ static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 	case ISCSI_HOST_PARAM_HWADDRESS:
 		len = format_addr(buf, ha->my_mac, MAC_ADDR_LEN);
 		break;
+	case ISCSI_HOST_PARAM_INITIATOR_NAME:
+		len = sprintf(buf, ha->name_string);
+		break;
 	default:
 		return -ENOSYS;
 	}

drivers/scsi/scsi_transport_iscsi.c

@@ -32,7 +32,7 @@
 
 #define ISCSI_SESSION_ATTRS 11
 #define ISCSI_CONN_ATTRS 11
-#define ISCSI_HOST_ATTRS 1
+#define ISCSI_HOST_ATTRS 2
 #define ISCSI_TRANSPORT_VERSION "2.0-724"
 
 struct iscsi_internal {
@@ -1253,6 +1253,7 @@ static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
 			NULL);
 
 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
+iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
 
 #define SETUP_PRIV_SESSION_RD_ATTR(field)				\
 do {									\
@@ -1389,6 +1390,7 @@ iscsi_register_transport(struct iscsi_transport *tt)
 	transport_container_register(&priv->t.host_attrs);
 
 	SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
+	SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
 	BUG_ON(count > ISCSI_HOST_ATTRS);
 	priv->host_attrs[count] = NULL;
 	count = 0;

include/scsi/iscsi_if.h

@@ -259,10 +259,12 @@ enum iscsi_param {
 /* iSCSI HBA params */
 enum iscsi_host_param {
 	ISCSI_HOST_PARAM_HWADDRESS,
+	ISCSI_HOST_PARAM_INITIATOR_NAME,
 	ISCSI_HOST_PARAM_MAX,
 };
 
 #define ISCSI_HOST_HWADDRESS		(1 << ISCSI_HOST_PARAM_HWADDRESS)
+#define ISCSI_HOST_INITIATOR_NAME	(1 << ISCSI_HOST_PARAM_INITIATOR_NAME)
 
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)

include/scsi/libiscsi.h

@@ -224,6 +224,7 @@ struct iscsi_session {
 	int			erl;
 	int			tpgt;
 	char			*targetname;
+	char			*initiatorname;
 	/* hw address being used for iscsi connection */
 	char			*hwaddress;
 	/* control data */