ice: Add code for DCB initialization part 1/4

This patch introduces a skeleton for ice_init_pf_dcb, the top level
function for DCB initialization. Subsequent patches will add to this
DCB init flow.

In this patch, ice_init_pf_dcb checks if DCB is a supported capability.
If so, an admin queue call to start the LLDP and DCBx in firmware is
issued. If not, an error is reported. Note that we don't fail the driver
init if DCB init fails.

Reviewed-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
new file mode 100644
index 000000000000..8ce358fbe9fb
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Intel Corporation. */
+
+#include "ice_dcb_lib.h"
+
+/**
+ * ice_init_pf_dcb - initialize DCB for a PF
+ * @pf: pf to initiialize DCB for
+ */
+int ice_init_pf_dcb(struct ice_pf *pf)
+{
+	struct device *dev = &pf->pdev->dev;
+	struct ice_port_info *port_info;
+	struct ice_hw *hw = &pf->hw;
+
+	port_info = hw->port_info;
+
+	/* check if device is DCB capable */
+	if (!hw->func_caps.common_cap.dcb) {
+		dev_dbg(dev, "DCB not supported\n");
+		return -EOPNOTSUPP;
+	}
+
+	/* Best effort to put DCBx and LLDP into a good state */
+	port_info->dcbx_status = ice_get_dcbx_status(hw);
+	if (port_info->dcbx_status != ICE_DCBX_STATUS_DONE &&
+	    port_info->dcbx_status != ICE_DCBX_STATUS_IN_PROGRESS) {
+		bool dcbx_status;
+
+		/* Attempt to start LLDP engine. Ignore errors
+		 * as this will error if it is already started
+		 */
+		ice_aq_start_lldp(hw, NULL);
+
+		/* Attempt to start DCBX. Ignore errors as this
+		 * will error if it is already started
+		 */
+		ice_aq_start_stop_dcbx(hw, true, &dcbx_status, NULL);
+	}
+
+	return 0;
+}