[SCSI] libiscsi, iscsi_tcp, ib_iser : add sw iscsi host get/set params helpers

iscsid and udev need to key off the hw address being
used so add some helpers for iser and iscsi tcp.

Also convert them

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

4 files changed, 60 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index dd221eda3ea6..2a99b7b6c906 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -576,6 +576,7 @@ static struct iscsi_transport iscsi_iser_transport = {
                                   ISCSI_PERSISTENT_ADDRESS |
                                   ISCSI_TARGET_NAME |
                                   ISCSI_TPGT,
+        .host_param_mask        = ISCSI_HOST_HWADDRESS,
         .host_template          = &iscsi_iser_sht,
         .conndata_size          = sizeof(struct iscsi_conn),
         .max_lun                = ISCSI_ISER_MAX_LUN,
@@ -592,6 +593,9 @@ static struct iscsi_transport iscsi_iser_transport = {
         .get_session_param      = iscsi_session_get_param,
         .start_conn             = iscsi_iser_conn_start,
         .stop_conn              = iscsi_conn_stop,
+        /* iscsi host params */
+        .get_host_param         = iscsi_host_get_param,
+        .set_host_param         = iscsi_host_set_param,
         /* IO */
         .send_pdu               = iscsi_conn_send_pdu,
         .get_stats              = iscsi_iser_conn_get_stats,
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index c9a3abf9e7b6..9a42fc074b76 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2181,6 +2181,7 @@ static struct iscsi_transport iscsi_tcp_transport = {
                                   ISCSI_PERSISTENT_ADDRESS |
                                   ISCSI_TARGET_NAME |
                                   ISCSI_TPGT,
+        .host_param_mask        = ISCSI_HOST_HWADDRESS,
         .host_template          = &iscsi_sht,
         .conndata_size          = sizeof(struct iscsi_conn),
         .max_conn               = 1,
@@ -2197,6 +2198,9 @@ static struct iscsi_transport iscsi_tcp_transport = {
         .get_session_param      = iscsi_session_get_param,
         .start_conn             = iscsi_conn_start,
         .stop_conn              = iscsi_tcp_conn_stop,
+        /* iscsi host params */
+        .get_host_param         = iscsi_host_get_param,
+        .set_host_param         = iscsi_host_set_param,
         /* IO */
         .send_pdu               = iscsi_conn_send_pdu,
         .get_stats              = iscsi_conn_get_stats,
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 3f5b9b445b29..d430e227e9b7 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1462,6 +1462,7 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
         iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
 
         kfree(session->targetname);
+        kfree(session->hwaddress);
 
         iscsi_destroy_session(cls_session);
         scsi_host_put(shost);
@@ -1990,6 +1991,45 @@ int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
 }
 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
 
+int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
+                         char *buf)
+{
+        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+        int len;
+
+        switch (param) {
+        case ISCSI_HOST_PARAM_HWADDRESS:
+                if (!session->hwaddress)
+                        len = sprintf(buf, "%s\n", "default");
+                else
+                        len = sprintf(buf, "%s\n", session->hwaddress);
+                break;
+        default:
+                return -ENOSYS;
+        }
+
+        return len;
+}
+EXPORT_SYMBOL_GPL(iscsi_host_get_param);
+
+int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
+                         char *buf, int buflen)
+{
+        struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+
+        switch (param) {
+        case ISCSI_HOST_PARAM_HWADDRESS:
+                if (!session->hwaddress)
+                        session->hwaddress = kstrdup(buf, GFP_KERNEL);
+                break;
+        default:
+                return -ENOSYS;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_host_set_param);
+
 MODULE_AUTHOR("Mike Christie");
 MODULE_DESCRIPTION("iSCSI library functions");
 MODULE_LICENSE("GPL");
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index ea0816d4904d..e202cc00c8e7 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -224,7 +224,8 @@ struct iscsi_session {
         int                     erl;
         int                     tpgt;
         char                    *targetname;
-
+        /* hw address being used for iscsi connection */
+        char                    *hwaddress;
         /* control data */
         struct iscsi_transport  *tt;
         struct Scsi_Host        *host;
@@ -255,6 +256,16 @@ extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
 extern int iscsi_queuecommand(struct scsi_cmnd *sc,
                               void (*done)(struct scsi_cmnd *));
 
+
+/*
+ * iSCSI host helpers.
+ */
+extern int iscsi_host_set_param(struct Scsi_Host *shost,
+                                enum iscsi_host_param param, char *buf,
+                                int buflen);
+extern int iscsi_host_get_param(struct Scsi_Host *shost,
+                                enum iscsi_host_param param, char *buf);
+
 /*
  * session management
  */