scsi: qedf: Add dcbx_not_wait module parameter so we won't wait for DCBX...

scsi: qedf: Add dcbx_not_wait module parameter so we won't wait for DCBX convergence to start discovery

This module parameter is to work around cases where we do not receive
the DCBX handler notification from qed but discovery is still possible
if we send out a FIP VLAN request irregardless of the DCBX state.

[mkp: zeroday warning]
Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedf/qedf_main.c

@@ -89,6 +89,11 @@ module_param_named(retry_delay, qedf_retry_delay, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(retry_delay, " Enable/disable handling of FCP_RSP IU retry "
 	"delay handling (default off).");
 
+static bool qedf_dcbx_no_wait;
+module_param_named(dcbx_no_wait, qedf_dcbx_no_wait, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(dcbx_no_wait, " Do not wait for DCBX convergence to start "
+	"sending FIP VLAN requests on link up (Default: off).");
+
 static uint qedf_dp_module;
 module_param_named(dp_module, qedf_dp_module, uint, S_IRUGO);
 MODULE_PARM_DESC(dp_module, " bit flags control for verbose printk passed "
@@ -489,7 +494,8 @@ static void qedf_link_update(void *dev, struct qed_link_output *link)
 		atomic_set(&qedf->link_state, QEDF_LINK_UP);
 		qedf_update_link_speed(qedf, link);
 
-		if (atomic_read(&qedf->dcbx) == QEDF_DCBX_DONE) {
+		if (atomic_read(&qedf->dcbx) == QEDF_DCBX_DONE ||
+		    qedf_dcbx_no_wait) {
 			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 			     "DCBx done.\n");
 			if (atomic_read(&qedf->link_down_tmo_valid) > 0)
@@ -541,7 +547,8 @@ static void qedf_dcbx_handler(void *dev, struct qed_dcbx_get *get, u32 mib_type)
 
 		atomic_set(&qedf->dcbx, QEDF_DCBX_DONE);
 
-		if (atomic_read(&qedf->link_state) == QEDF_LINK_UP) {
+		if (atomic_read(&qedf->link_state) == QEDF_LINK_UP &&
+		    !qedf_dcbx_no_wait) {
 			if (atomic_read(&qedf->link_down_tmo_valid) > 0)
 				queue_delayed_work(qedf->link_update_wq,
 				    &qedf->link_recovery, 0);