[SCSI] Add an 'Issue LIP' device attribute in fc_transport class

Ok, here's a patch to add such a common API for fc transport users.
Relevant LLD changes (lpfc and qla2xxx) also present.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

5 files changed, 50 insertions, 13 deletions

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index acae7c48ef7d..445da1d0cc88 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -200,19 +200,13 @@ lpfc_num_discovered_ports_show(struct class_device *cdev, char *buf)
 }
 
 
-static ssize_t
-lpfc_issue_lip (struct class_device *cdev, const char *buf, size_t count)
+static int
+lpfc_issue_lip(struct Scsi_Host *host)
 {
-        struct Scsi_Host *host = class_to_shost(cdev);
         struct lpfc_hba *phba = (struct lpfc_hba *) host->hostdata[0];
-        int val = 0;
         LPFC_MBOXQ_t *pmboxq;
         int mbxstatus = MBXERR_ERROR;
 
-        if ((sscanf(buf, "%d", &val) != 1) ||
-            (val != 1))
-                return -EINVAL;
-
         if ((phba->fc_flag & FC_OFFLINE_MODE) ||
             (phba->hba_state != LPFC_HBA_READY))
                 return -EPERM;
@@ -234,7 +228,7 @@ lpfc_issue_lip (struct class_device *cdev, const char *buf, size_t count)
         if (mbxstatus == MBXERR_ERROR)
                 return -EIO;
 
-        return strlen(buf);
+        return 0;
 }
 
 static ssize_t
@@ -364,7 +358,6 @@ static CLASS_DEVICE_ATTR(lpfc_drvr_version, S_IRUGO, lpfc_drvr_version_show,
                          NULL);
 static CLASS_DEVICE_ATTR(management_version, S_IRUGO, management_version_show,
                          NULL);
-static CLASS_DEVICE_ATTR(issue_lip, S_IWUSR, NULL, lpfc_issue_lip);
 static CLASS_DEVICE_ATTR(board_online, S_IRUGO | S_IWUSR,
                          lpfc_board_online_show, lpfc_board_online_store);
 
@@ -537,7 +530,6 @@ struct class_device_attribute *lpfc_host_attrs[] = {
         &class_device_attr_lpfc_max_luns,
         &class_device_attr_nport_evt_cnt,
         &class_device_attr_management_version,
-        &class_device_attr_issue_lip,
         &class_device_attr_board_online,
         NULL,
 };
@@ -1234,6 +1226,8 @@ struct fc_function_template lpfc_transport_functions = {
 
         .get_starget_port_name = lpfc_get_starget_port_name,
         .show_starget_port_name = 1,
+
+        .issue_fc_host_lip = lpfc_issue_lip,
 };
 
 void
diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 49696faa24fa..48e460eef05a 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -503,6 +503,15 @@ qla2x00_set_rport_loss_tmo(struct fc_rport *rport, uint32_t timeout)
         rport->dev_loss_tmo = ha->port_down_retry_count + 5;
 }
 
+static int
+qla2x00_issue_lip(struct Scsi_Host *shost)
+{
+        scsi_qla_host_t *ha = to_qla_host(shost);
+
+        set_bit(LOOP_RESET_NEEDED, &ha->dpc_flags);
+        return 0;
+}
+
 struct fc_function_template qla2xxx_transport_functions = {
 
         .show_host_node_name = 1,
@@ -526,6 +535,7 @@ struct fc_function_template qla2xxx_transport_functions = {
         .set_rport_dev_loss_tmo = qla2x00_set_rport_loss_tmo,
         .show_rport_dev_loss_tmo = 1,
 
+        .issue_fc_host_lip = qla2x00_issue_lip,
 };
 
 void
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index d9eccdf4f403..b899282a856e 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -2141,6 +2141,12 @@ qla2x00_do_dpc(void *data)
                             ha->host_no));
                 }
 
+                if (test_and_clear_bit(LOOP_RESET_NEEDED, &ha->dpc_flags)) {
+                        DEBUG(printk("scsi(%ld): dpc: sched loop_reset()\n",
+                            ha->host_no));
+                        qla2x00_loop_reset(ha);
+                }
+
                 if (test_and_clear_bit(RESET_MARKER_NEEDED, &ha->dpc_flags) &&
                     (!(test_and_set_bit(RESET_ACTIVE, &ha->dpc_flags)))) {
 
@@ -2442,6 +2448,7 @@ qla2x00_timer(scsi_qla_host_t *ha)
         /* Schedule the DPC routine if needed */
         if ((test_bit(ISP_ABORT_NEEDED, &ha->dpc_flags) ||
             test_bit(LOOP_RESYNC_NEEDED, &ha->dpc_flags) ||
+            test_bit(LOOP_RESET_NEEDED, &ha->dpc_flags) ||
             start_dpc ||
             test_bit(LOGIN_RETRY_NEEDED, &ha->dpc_flags) ||
             test_bit(RESET_MARKER_NEEDED, &ha->dpc_flags) ||
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 473a82d5e3e2..27702097b7fc 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -220,7 +220,7 @@ static void fc_rport_terminate(struct fc_rport  *rport);
  */
 #define FC_STARGET_NUM_ATTRS    3
 #define FC_RPORT_NUM_ATTRS      9
-#define FC_HOST_NUM_ATTRS       15
+#define FC_HOST_NUM_ATTRS       16
 
 struct fc_internal {
         struct scsi_transport_template t;
@@ -713,9 +713,11 @@ static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
         count++
 
 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
+{                                                                       \
         i->private_host_attrs[count] = class_device_attr_host_##field;  \
         i->host_attrs[count] = &i->private_host_attrs[count];           \
-        count++
+        count++;                                                        \
+}
 
 
 /* Fixed Host Attributes */
@@ -853,6 +855,26 @@ static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
                         show_fc_private_host_tgtid_bind_type,
                         store_fc_private_host_tgtid_bind_type);
 
+static ssize_t
+store_fc_private_host_issue_lip(struct class_device *cdev,
+        const char *buf, size_t count)
+{
+        struct Scsi_Host *shost = transport_class_to_shost(cdev);
+        struct fc_internal *i = to_fc_internal(shost->transportt);
+        int ret;
+
+        /* ignore any data value written to the attribute */
+        if (i->f->issue_fc_host_lip) {
+                ret = i->f->issue_fc_host_lip(shost);
+                return ret ? ret: count;
+        }
+
+        return -ENOENT;
+}
+
+static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
+                        store_fc_private_host_issue_lip);
+
 /*
  * Host Statistics Management
  */
@@ -1119,6 +1141,8 @@ fc_attach_transport(struct fc_function_template *ft)
 
         /* Transport-managed attributes */
         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
+        if (ft->issue_fc_host_lip)
+                SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
 
         BUG_ON(count > FC_HOST_NUM_ATTRS);
 
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index b0d445437372..4496b32972e5 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -384,6 +384,8 @@ struct fc_function_template {
         struct fc_host_statistics * (*get_fc_host_stats)(struct Scsi_Host *);
         void    (*reset_fc_host_stats)(struct Scsi_Host *);
 
+        int     (*issue_fc_host_lip)(struct Scsi_Host *);
+
         /* allocation lengths for host-specific data */
         u32                             dd_fcrport_size;