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, 85 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_dcb.c b/drivers/net/ethernet/intel/ice/ice_dcb.c
new file mode 100644
index 000000000000..39543e487ec1
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_dcb.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Intel Corporation. */
+
+#include "ice_common.h"
+#include "ice_sched.h"
+#include "ice_dcb.h"
+
+/**
+ * ice_aq_start_lldp
+ * @hw: pointer to the HW struct
+ * @cd: pointer to command details structure or NULL
+ *
+ * Start the embedded LLDP Agent on all ports. (0x0A06)
+ */
+enum ice_status ice_aq_start_lldp(struct ice_hw *hw, struct ice_sq_cd *cd)
+{
+	struct ice_aqc_lldp_start *cmd;
+	struct ice_aq_desc desc;
+
+	cmd = &desc.params.lldp_start;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_lldp_start);
+
+	cmd->command = ICE_AQ_LLDP_AGENT_START;
+
+	return ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
+}
+
+/**
+ * ice_get_dcbx_status
+ * @hw: pointer to the HW struct
+ *
+ * Get the DCBX status from the Firmware
+ */
+u8 ice_get_dcbx_status(struct ice_hw *hw)
+{
+	u32 reg;
+
+	reg = rd32(hw, PRTDCB_GENS);
+	return (u8)((reg & PRTDCB_GENS_DCBX_STATUS_M) >>
+		    PRTDCB_GENS_DCBX_STATUS_S);
+}
+
+/**
+ * ice_aq_start_stop_dcbx - Start/Stop DCBx service in FW
+ * @hw: pointer to the HW struct
+ * @start_dcbx_agent: True if DCBx Agent needs to be started
+ *		      False if DCBx Agent needs to be stopped
+ * @dcbx_agent_status: FW indicates back the DCBx agent status
+ *		       True if DCBx Agent is active
+ *		       False if DCBx Agent is stopped
+ * @cd: pointer to command details structure or NULL
+ *
+ * Start/Stop the embedded dcbx Agent. In case that this wrapper function
+ * returns ICE_SUCCESS, caller will need to check if FW returns back the same
+ * value as stated in dcbx_agent_status, and react accordingly. (0x0A09)
+ */
+enum ice_status
+ice_aq_start_stop_dcbx(struct ice_hw *hw, bool start_dcbx_agent,
+		       bool *dcbx_agent_status, struct ice_sq_cd *cd)
+{
+	struct ice_aqc_lldp_stop_start_specific_agent *cmd;
+	enum ice_status status;
+	struct ice_aq_desc desc;
+	u16 opcode;
+
+	cmd = &desc.params.lldp_agent_ctrl;
+
+	opcode = ice_aqc_opc_lldp_stop_start_specific_agent;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, opcode);
+
+	if (start_dcbx_agent)
+		cmd->command = ICE_AQC_START_STOP_AGENT_START_DCBX;
+
+	status = ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
+
+	*dcbx_agent_status = false;
+
+	if (!status &&
+	    cmd->command == ICE_AQC_START_STOP_AGENT_START_DCBX)
+		*dcbx_agent_status = true;
+
+	return status;
+}