[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>

2 files changed, 5 insertions, 1 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 642998069e00..50e907f42048 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -271,12 +271,14 @@ enum iscsi_param {
 enum iscsi_host_param {
         ISCSI_HOST_PARAM_HWADDRESS,
         ISCSI_HOST_PARAM_INITIATOR_NAME,
+        ISCSI_HOST_PARAM_NETDEV_NAME,
         ISCSI_HOST_PARAM_IPADDRESS,
         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_HOST_NETDEV_NAME          (1 << ISCSI_HOST_PARAM_NETDEV_NAME)
 #define ISCSI_HOST_IPADDRESS            (1 << ISCSI_HOST_PARAM_IPADDRESS)
 
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
@@ -303,6 +305,7 @@ enum iscsi_host_param {
 #define CAP_MARKERS             0x100
 #define CAP_FW_DB               0x200
 #define CAP_SENDTARGETS_OFFLOAD 0x400
+#define CAP_DATA_PATH_OFFLOAD   0x800
 
 /*
  * These flags describes reason of stop_conn() call
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index eea33f7b1544..3f631b08a1ab 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -228,8 +228,9 @@ struct iscsi_session {
         char                    *password_in;
         char                    *targetname;
         char                    *initiatorname;
-        /* hw address being used for iscsi connection */
+        /* hw address or netdev iscsi connection is bound to */
         char                    *hwaddress;
+        char                    *netdev;
         /* control data */
         struct iscsi_transport  *tt;
         struct Scsi_Host        *host;