[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>

1 files changed, 26 insertions, 2 deletions

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);