[SCSI] IB/iser: Add Discovery support

To run discovery over iSER we need to advertize the CAP_TEXT_NEGO capability
towards user space. Also need to make sure the login RX buffer is posted when
SendTargets TEXT PDUs are sent. For that end, we use a setting of the
ISCSI_PARAM_DISCOVERY_SESS iscsi param as an indication that this is
discovery session.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index f75761726c7f..e3995612ea76 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -3170,6 +3170,7 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
 {
         struct iscsi_conn *conn = cls_conn->dd_data;
         struct iscsi_session *session = conn->session;
+        int val;
 
         switch(param) {
         case ISCSI_PARAM_FAST_ABORT:
@@ -3264,6 +3265,10 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
         case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
                 return iscsi_switch_str_param(&session->discovery_parent_type,
                                               buf);
+        case ISCSI_PARAM_DISCOVERY_SESS:
+                sscanf(buf, "%d", &val);
+                session->discovery_sess = !!val;
+                break;
         default:
                 return -ENOSYS;
         }