[SCSI] iscsi class, iscsi_tcp, iser, qla4xxx: add netdevname sysfs attr

iSCSI must support software iscsi (iscsi_tcp, iser), hardware iscsi (qla4xxx),
and partial offload (broadcom). To be able to allow each stack or driver
or port (virtual or physical) to be able to log into the same target portal
we use the initiator tuple [[HWADDRESS | NETDEVNAME], INITIATOR_NAME] and
the target tuple [TARGETNAME, CONN_ADDRESS, CONN_PORT] to id a session.
This patch adds the netdev name, which is used by software iscsi when
it binds a session to a netdevice using the SO_BINDTODEVICE sock opt.
It cannot use HWADDRESS because if someone did vlans then the same netdevice
will have the same mac and the initiator,target id will not be unique.

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>

4 files changed, 19 insertions, 4 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index da66fb524b5..d5a6527b3b3 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2303,7 +2303,8 @@ static struct iscsi_transport iscsi_tcp_transport = {
 				  ISCSI_USERNAME | ISCSI_PASSWORD |
 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
-				  ISCSI_HOST_INITIATOR_NAME,
+				  ISCSI_HOST_INITIATOR_NAME |
+				  ISCSI_HOST_NETDEV_NAME,
 	.host_template		= &iscsi_sht,
 	.conndata_size		= sizeof(struct iscsi_conn),
 	.max_conn		= 1,
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 1632866f52c..865dd5739f0 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1483,6 +1483,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
 	kfree(session->username);
 	kfree(session->username_in);
 	kfree(session->targetname);
+	kfree(session->netdev);
 	kfree(session->hwaddress);
 	kfree(session->initiatorname);
 
@@ -2040,6 +2041,12 @@ int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
 	int len;
 
 	switch (param) {
+	case ISCSI_HOST_PARAM_NETDEV_NAME:
+		if (!session->netdev)
+			len = sprintf(buf, "%s\n", "default");
+		else
+			len = sprintf(buf, "%s\n", session->netdev);
+		break;
 	case ISCSI_HOST_PARAM_HWADDRESS:
 		if (!session->hwaddress)
 			len = sprintf(buf, "%s\n", "default");
@@ -2067,6 +2074,10 @@ int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
 	struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
 
 	switch (param) {
+	case ISCSI_HOST_PARAM_NETDEV_NAME:
+		if (!session->netdev)
+			session->netdev = kstrdup(buf, GFP_KERNEL);
+		break;
 	case ISCSI_HOST_PARAM_HWADDRESS:
 		if (!session->hwaddress)
 			session->hwaddress = kstrdup(buf, GFP_KERNEL);
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index b87b460832e..e69160a7bc6 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -102,7 +102,8 @@ static struct scsi_host_template qla4xxx_driver_template = {
 static struct iscsi_transport qla4xxx_iscsi_transport = {
 	.owner			= THIS_MODULE,
 	.name			= DRIVER_NAME,
-	.caps			= CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD,
+	.caps			= CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
+				  CAP_DATA_PATH_OFFLOAD,
 	.param_mask		= ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 				  ISCSI_TARGET_NAME | ISCSI_TPGT,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 9b54eea2056..34c1860a259 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -32,7 +32,7 @@
 
 #define ISCSI_SESSION_ATTRS 15
 #define ISCSI_CONN_ATTRS 11
-#define ISCSI_HOST_ATTRS 3
+#define ISCSI_HOST_ATTRS 4
 #define ISCSI_TRANSPORT_VERSION "2.0-724"
 
 struct iscsi_internal {
@@ -1261,8 +1261,9 @@ show_host_param_##param(struct class_device *cdev, char *buf)		\
 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,	\
 			NULL);
 
-iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
+iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
+iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
 
 #define SETUP_PRIV_SESSION_RD_ATTR(field)				\
@@ -1399,6 +1400,7 @@ iscsi_register_transport(struct iscsi_transport *tt)
 	priv->t.host_size = sizeof(struct iscsi_host);
 	transport_container_register(&priv->t.host_attrs);
 
+	SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
 	SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
 	SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
 	SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);