[SCSI] libiscsi: Make iscsi_eh_target_reset start with session reset

The iscsi_eh_target_reset has been modified to attempt
target reset only. If it fails, then iscsi_eh_session_reset
will be called.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jayamohan Kallickal <jayamohank@serverengines.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 5f7a6fc..5472b7e 100644 (file)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -596,7 +596,7 @@ static struct scsi_host_template iscsi_iser_sht = {
        .cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
        .eh_abort_handler       = iscsi_eh_abort,
        .eh_device_reset_handler= iscsi_eh_device_reset,
-       .eh_target_reset_handler= iscsi_eh_target_reset,
+       .eh_target_reset_handler = iscsi_eh_recover_target,
        .target_alloc           = iscsi_target_alloc,
        .use_clustering         = DISABLE_CLUSTERING,
        .proc_name              = "iscsi_iser",

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 7c22616..4d269b4 100644 (file)
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -79,7 +79,7 @@ static struct scsi_host_template beiscsi_sht = {
        .slave_configure = beiscsi_slave_configure,
        .target_alloc = iscsi_target_alloc,
        .eh_device_reset_handler = iscsi_eh_device_reset,
-       .eh_target_reset_handler = iscsi_eh_target_reset,
+       .eh_target_reset_handler = iscsi_eh_session_reset,
        .sg_tablesize = BEISCSI_SGLIST_ELEMENTS,
        .can_queue = BE2_IO_DEPTH,
        .this_id = -1,

diff --git a/drivers/scsi/bnx2i/bnx2i_iscsi.c b/drivers/scsi/bnx2i/bnx2i_iscsi.c
index 1c4d121..cb71dc9 100644 (file)
--- a/drivers/scsi/bnx2i/bnx2i_iscsi.c
+++ b/drivers/scsi/bnx2i/bnx2i_iscsi.c
@@ -1989,7 +1989,7 @@ static struct scsi_host_template bnx2i_host_template = {
        .queuecommand           = iscsi_queuecommand,
        .eh_abort_handler       = iscsi_eh_abort,
        .eh_device_reset_handler = iscsi_eh_device_reset,
-       .eh_target_reset_handler = iscsi_eh_target_reset,
+       .eh_target_reset_handler = iscsi_eh_recover_target,
        .change_queue_depth     = iscsi_change_queue_depth,
        .can_queue              = 1024,
        .max_sectors            = 127,

diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
index 412853c..b7c3058 100644 (file)
--- a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -915,7 +915,7 @@ static struct scsi_host_template cxgb3i_host_template = {
        .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
        .eh_abort_handler       = iscsi_eh_abort,
        .eh_device_reset_handler = iscsi_eh_device_reset,
-       .eh_target_reset_handler = iscsi_eh_target_reset,
+       .eh_target_reset_handler = iscsi_eh_recover_target,
        .target_alloc           = iscsi_target_alloc,
        .use_clustering         = DISABLE_CLUSTERING,
        .this_id                = -1,

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 8a89ba9..249053a 100644 (file)
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -874,7 +874,7 @@ static struct scsi_host_template iscsi_sw_tcp_sht = {
        .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
        .eh_abort_handler       = iscsi_eh_abort,
        .eh_device_reset_handler= iscsi_eh_device_reset,
-       .eh_target_reset_handler= iscsi_eh_target_reset,
+       .eh_target_reset_handler = iscsi_eh_recover_target,
        .use_clustering         = DISABLE_CLUSTERING,
        .slave_alloc            = iscsi_sw_tcp_slave_alloc,
        .slave_configure        = iscsi_sw_tcp_slave_configure,

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 703eb6a..685eaec 100644 (file)
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -2338,7 +2338,7 @@ EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
  * This function will wait for a relogin, session termination from
  * userspace, or a recovery/replacement timeout.
  */
-static int iscsi_eh_session_reset(struct scsi_cmnd *sc)
+int iscsi_eh_session_reset(struct scsi_cmnd *sc)
 {
        struct iscsi_cls_session *cls_session;
        struct iscsi_session *session;
@@ -2389,6 +2389,7 @@ failed:
        mutex_unlock(&session->eh_mutex);
        return SUCCESS;
 }
+EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
 
 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
 {
@@ -2403,8 +2404,7 @@ static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
  * iscsi_eh_target_reset - reset target
  * @sc: scsi command
  *
- * This will attempt to send a warm target reset. If that fails
- * then we will drop the session and attempt ERL0 recovery.
+ * This will attempt to send a warm target reset.
  */
 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
 {
@@ -2476,12 +2476,27 @@ done:
        ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
                     rc == SUCCESS ? "SUCCESS" : "FAILED");
        mutex_unlock(&session->eh_mutex);
+       return rc;
+}
+EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
 
+/**
+ * iscsi_eh_recover_target - reset target and possibly the session
+ * @sc: scsi command
+ *
+ * This will attempt to send a warm target reset. If that fails,
+ * we will escalate to ERL0 session recovery.
+ */
+int iscsi_eh_recover_target(struct scsi_cmnd *sc)
+{
+       int rc;
+
+       rc = iscsi_eh_target_reset(sc);
        if (rc == FAILED)
                rc = iscsi_eh_session_reset(sc);
        return rc;
 }
-EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
+EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
 
 /*
  * Pre-allocate a pool of @max items of @item_size. By default, the pool

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index ff92b46..ae5196a 100644 (file)
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -338,7 +338,8 @@ struct iscsi_host {
 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth,
                                    int reason);
 extern int iscsi_eh_abort(struct scsi_cmnd *sc);
-extern int iscsi_eh_target_reset(struct scsi_cmnd *sc);
+extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
+extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
 extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
 extern int iscsi_queuecommand(struct scsi_cmnd *sc,
                              void (*done)(struct scsi_cmnd *));