[SCSI] iscsi: increment expstatsn during login

debugged by Ming and Rohan:

The problem Ming and Rohan debugged was that during a normal session
login, open-iscsi is not incrementing the exp_statsn counter. It was
stuck at zero. From the RFC, it looks like if the login response PDU has
a successful status then we should be incrementing that value. Also from
the RFC, it looks like if when we drop a connection then reconnect, we
should be using the exp_statsn from the old connection in the next
relogin attempt.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 41f4bb557ea6..c0ce6ab81a9d 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2298,6 +2298,9 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
                 BUG_ON(value);
                 session->ofmarker_en = value;
                 break;
+        case ISCSI_PARAM_EXP_STATSN:
+                conn->exp_statsn = value;
+                break;
         default:
                 break;
         }
@@ -2381,6 +2384,9 @@ iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
                 inet = inet_sk(tcp_conn->sock->sk);
                 *value = be16_to_cpu(inet->dport);
                 mutex_unlock(&conn->xmitmutex);
+        case ISCSI_PARAM_EXP_STATSN:
+                *value = conn->exp_statsn;
+                break;
         default:
                 return -EINVAL;
         }
@@ -2548,7 +2554,8 @@ static struct iscsi_transport iscsi_tcp_transport = {
                                   ISCSI_DATASEQ_INORDER_EN |
                                   ISCSI_ERL |
                                   ISCSI_CONN_PORT |
-                                  ISCSI_CONN_ADDRESS,
+                                  ISCSI_CONN_ADDRESS |
+                                  ISCSI_EXP_STATSN,
         .host_template          = &iscsi_sht,
         .conndata_size          = sizeof(struct iscsi_conn),
         .max_conn               = 1,