[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>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 9b54eea20560..34c1860a259d 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);