drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 1999 - 2018 Intel Corporation. */

 #include "ixgbe.h"
 #include "ixgbe_type.h"
 #include "ixgbe_dcb.h"
 #include "ixgbe_dcb_82599.h"

 /**
  * ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter
  * @hw: pointer to hardware structure
  * @refill: refill credits index by traffic class
  * @max: max credits index by traffic class
  * @bwg_id: bandwidth grouping indexed by traffic class
  * @prio_type: priority type indexed by traffic class
  * @prio_tc: priority to tc assignments indexed by priority
  *
  * Configure Rx Packet Arbiter and credits for each traffic class.
  */
 s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw,
 				      u16 *refill,
 				      u16 *max,
 				      u8 *bwg_id,
 				      u8 *prio_type,
 				      u8 *prio_tc)
 {
 	u32    reg           = 0;
 	u32    credit_refill = 0;
 	u32    credit_max    = 0;
 	u8     i             = 0;

 	/*
 	 * Disable the arbiter before changing parameters
 	 * (always enable recycle mode; WSP)
 	 */
 	reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC | IXGBE_RTRPCS_ARBDIS;
 	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

 	/* Map all traffic classes to their UP */
 	reg = 0;
 	for (i = 0; i < MAX_USER_PRIORITY; i++)
 		reg |= (prio_tc[i] << (i * IXGBE_RTRUP2TC_UP_SHIFT));
 	IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, reg);

 	/* Configure traffic class credits and priority */
 	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 		credit_refill = refill[i];
 		credit_max    = max[i];
 		reg = credit_refill | (credit_max << IXGBE_RTRPT4C_MCL_SHIFT);

 		reg |= (u32)(bwg_id[i]) << IXGBE_RTRPT4C_BWG_SHIFT;

 		if (prio_type[i] == prio_link)
 			reg |= IXGBE_RTRPT4C_LSP;

 		IXGBE_WRITE_REG(hw, IXGBE_RTRPT4C(i), reg);
 	}

 	/*
 	 * Configure Rx packet plane (recycle mode; WSP) and
 	 * enable arbiter
 	 */
 	reg = IXGBE_RTRPCS_RRM | IXGBE_RTRPCS_RAC;
 	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

 	return 0;
 }

 /**
  * ixgbe_dcb_config_tx_desc_arbiter_82599 - Config Tx Desc. arbiter
  * @hw: pointer to hardware structure
  * @refill: refill credits index by traffic class
  * @max: max credits index by traffic class
  * @bwg_id: bandwidth grouping indexed by traffic class
  * @prio_type: priority type indexed by traffic class
  *
  * Configure Tx Descriptor Arbiter and credits for each traffic class.
  */
 s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw,
 					   u16 *refill,
 					   u16 *max,
 					   u8 *bwg_id,
 					   u8 *prio_type)
 {
 	u32    reg, max_credits;
 	u8     i;

 	/* Clear the per-Tx queue credits; we use per-TC instead */
 	for (i = 0; i < 128; i++) {
 		IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i);
 		IXGBE_WRITE_REG(hw, IXGBE_RTTDT1C, 0);
 	}

 	/* Configure traffic class credits and priority */
 	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 		max_credits = max[i];
 		reg = max_credits << IXGBE_RTTDT2C_MCL_SHIFT;
 		reg |= refill[i];
 		reg |= (u32)(bwg_id[i]) << IXGBE_RTTDT2C_BWG_SHIFT;

 		if (prio_type[i] == prio_group)
 			reg |= IXGBE_RTTDT2C_GSP;

 		if (prio_type[i] == prio_link)
 			reg |= IXGBE_RTTDT2C_LSP;

 		IXGBE_WRITE_REG(hw, IXGBE_RTTDT2C(i), reg);
 	}

 	/*
 	 * Configure Tx descriptor plane (recycle mode; WSP) and
 	 * enable arbiter
 	 */
 	reg = IXGBE_RTTDCS_TDPAC | IXGBE_RTTDCS_TDRM;
 	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

 	return 0;
 }

 /**
  * ixgbe_dcb_config_tx_data_arbiter_82599 - Config Tx Data arbiter
  * @hw: pointer to hardware structure
  * @refill: refill credits index by traffic class
  * @max: max credits index by traffic class
  * @bwg_id: bandwidth grouping indexed by traffic class
  * @prio_type: priority type indexed by traffic class
  * @prio_tc: priority to tc assignments indexed by priority
  *
  * Configure Tx Packet Arbiter and credits for each traffic class.
  */
 s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
 					   u16 *refill,
 					   u16 *max,
 					   u8 *bwg_id,
 					   u8 *prio_type,
 					   u8 *prio_tc)
 {
 	u32 reg;
 	u8 i;

 	/*
 	 * Disable the arbiter before changing parameters
 	 * (always enable recycle mode; SP; arb delay)
 	 */
 	reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM |
 	      (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT) |
 	      IXGBE_RTTPCS_ARBDIS;
 	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);

 	/* Map all traffic classes to their UP */
 	reg = 0;
 	for (i = 0; i < MAX_USER_PRIORITY; i++)
 		reg |= (prio_tc[i] << (i * IXGBE_RTTUP2TC_UP_SHIFT));
 	IXGBE_WRITE_REG(hw, IXGBE_RTTUP2TC, reg);

 	/* Configure traffic class credits and priority */
 	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
 		reg = refill[i];
 		reg |= (u32)(max[i]) << IXGBE_RTTPT2C_MCL_SHIFT;
 		reg |= (u32)(bwg_id[i]) << IXGBE_RTTPT2C_BWG_SHIFT;

 		if (prio_type[i] == prio_group)
 			reg |= IXGBE_RTTPT2C_GSP;

 		if (prio_type[i] == prio_link)
 			reg |= IXGBE_RTTPT2C_LSP;

 		IXGBE_WRITE_REG(hw, IXGBE_RTTPT2C(i), reg);
 	}

 	/*
 	 * Configure Tx packet plane (recycle mode; SP; arb delay) and
 	 * enable arbiter
 	 */
 	reg = IXGBE_RTTPCS_TPPAC | IXGBE_RTTPCS_TPRM |
 	      (IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT);
 	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);

 	return 0;
 }

 /**
  * ixgbe_dcb_config_pfc_82599 - Configure priority flow control
  * @hw: pointer to hardware structure
  * @pfc_en: enabled pfc bitmask
  * @prio_tc: priority to tc assignments indexed by priority
  *
  * Configure Priority Flow Control (PFC) for each traffic class.
  */
 s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc)
 {
 	u32 i, j, fcrtl, reg;
 	u8 max_tc = 0;

 	/* Enable Transmit Priority Flow Control */
 	IXGBE_WRITE_REG(hw, IXGBE_FCCFG, IXGBE_FCCFG_TFCE_PRIORITY);

 	/* Enable Receive Priority Flow Control */
 	reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
 	reg |= IXGBE_MFLCN_DPF;

 	/*
 	 * X540 & X550 supports per TC Rx priority flow control.
 	 * So clear all TCs and only enable those that should be
 	 * enabled.
 	 */
 	reg &= ~(IXGBE_MFLCN_RPFCE_MASK | IXGBE_MFLCN_RFCE);

 	if (hw->mac.type >= ixgbe_mac_X540)
 		reg |= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT;

 	if (pfc_en)
 		reg |= IXGBE_MFLCN_RPFCE;

 	IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);

 	for (i = 0; i < MAX_USER_PRIORITY; i++) {
 		if (prio_tc[i] > max_tc)
 			max_tc = prio_tc[i];
 	}


 	/* Configure PFC Tx thresholds per TC */
 	for (i = 0; i <= max_tc; i++) {
 		int enabled = 0;

 		for (j = 0; j < MAX_USER_PRIORITY; j++) {
 			if ((prio_tc[j] == i) && (pfc_en & BIT(j))) {
 				enabled = 1;
 				break;
 			}
 		}

 		if (enabled) {
 			reg = (hw->fc.high_water[i] << 10) | IXGBE_FCRTH_FCEN;
 			fcrtl = (hw->fc.low_water[i] << 10) | IXGBE_FCRTL_XONE;
 			IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), fcrtl);
 		} else {
 			/* In order to prevent Tx hangs when the internal Tx
 			 * switch is enabled we must set the high water mark
 			 * to the Rx packet buffer size - 24KB.  This allows
 			 * the Tx switch to function even under heavy Rx
 			 * workloads.
 			 */
 			reg = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 24576;
 			IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
 		}

 		IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
 	}

 	for (; i < MAX_TRAFFIC_CLASS; i++) {
 		IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
 		IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), 0);
 	}

 	/* Configure pause time (2 TCs per register) */
 	reg = hw->fc.pause_time * 0x00010001;
 	for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
 		IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);

 	/* Configure flow control refresh threshold value */
 	IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);

 	return 0;
 }

 /**
  * ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics
  * @hw: pointer to hardware structure
  *
  * Configure queue statistics registers, all queues belonging to same traffic
  * class uses a single set of queue statistics counters.
  */
 static s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw)
 {
 	u32 reg = 0;
 	u8  i   = 0;

 	/*
 	 * Receive Queues stats setting
 	 * 32 RQSMR registers, each configuring 4 queues.
 	 * Set all 16 queues of each TC to the same stat
 	 * with TC 'n' going to stat 'n'.
 	 */
 	for (i = 0; i < 32; i++) {
 		reg = 0x01010101 * (i / 4);
 		IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
 	}
 	/*
 	 * Transmit Queues stats setting
 	 * 32 TQSM registers, each controlling 4 queues.
 	 * Set all queues of each TC to the same stat
 	 * with TC 'n' going to stat 'n'.
 	 * Tx queues are allocated non-uniformly to TCs:
 	 * 32, 32, 16, 16, 8, 8, 8, 8.
 	 */
 	for (i = 0; i < 32; i++) {
 		if (i < 8)
 			reg = 0x00000000;
 		else if (i < 16)
 			reg = 0x01010101;
 		else if (i < 20)
 			reg = 0x02020202;
 		else if (i < 24)
 			reg = 0x03030303;
 		else if (i < 26)
 			reg = 0x04040404;
 		else if (i < 28)
 			reg = 0x05050505;
 		else if (i < 30)
 			reg = 0x06060606;
 		else
 			reg = 0x07070707;
 		IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg);
 	}

 	return 0;
 }

 /**
  * ixgbe_dcb_hw_config_82599 - Configure and enable DCB
  * @hw: pointer to hardware structure
  * @pfc_en: enabled pfc bitmask
  * @refill: refill credits index by traffic class
  * @max: max credits index by traffic class
  * @bwg_id: bandwidth grouping indexed by traffic class
  * @prio_type: priority type indexed by traffic class
  * @prio_tc: priority to tc assignments indexed by priority
  *
  * Configure dcb settings and enable dcb mode.
  */
 s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw *hw, u8 pfc_en, u16 *refill,
 			      u16 *max, u8 *bwg_id, u8 *prio_type, u8 *prio_tc)
 {
 	ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
 					  prio_type, prio_tc);
 	ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
 					       bwg_id, prio_type);
 	ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max,
 					       bwg_id, prio_type, prio_tc);
 	ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc);
 	ixgbe_dcb_config_tc_stats_82599(hw);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0
	/* Copyright(c) 1999 - 2018 Intel Corporation. */

	#include "ixgbe.h"
	#include "ixgbe_type.h"
	#include "ixgbe_dcb.h"
	#include "ixgbe_dcb_82599.h"

	/**
	* ixgbe_dcb_config_rx_arbiter_82599 - Config Rx Data arbiter
	* @hw: pointer to hardware structure
	* @refill: refill credits index by traffic class
	* @max: max credits index by traffic class
	* @bwg_id: bandwidth grouping indexed by traffic class
	* @prio_type: priority type indexed by traffic class
	* @prio_tc: priority to tc assignments indexed by priority
	*
	* Configure Rx Packet Arbiter and credits for each traffic class.
	*/
	s32 ixgbe_dcb_config_rx_arbiter_82599(struct ixgbe_hw *hw,
	u16 *refill,
	u16 *max,
	u8 *bwg_id,
	u8 *prio_type,
	u8 *prio_tc)
	{
	u32 reg = 0;
	u32 credit_refill = 0;
	u32 credit_max = 0;
	u8 i = 0;

	/*
	* Disable the arbiter before changing parameters
	* (always enable recycle mode; WSP)
	*/
	reg = IXGBE_RTRPCS_RRM \| IXGBE_RTRPCS_RAC \| IXGBE_RTRPCS_ARBDIS;
	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

	/* Map all traffic classes to their UP */
	reg = 0;
	for (i = 0; i < MAX_USER_PRIORITY; i++)
	reg \|= (prio_tc[i] << (i * IXGBE_RTRUP2TC_UP_SHIFT));
	IXGBE_WRITE_REG(hw, IXGBE_RTRUP2TC, reg);

	/* Configure traffic class credits and priority */
	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
	credit_refill = refill[i];
	credit_max = max[i];
	reg = credit_refill \| (credit_max << IXGBE_RTRPT4C_MCL_SHIFT);

	reg \|= (u32)(bwg_id[i]) << IXGBE_RTRPT4C_BWG_SHIFT;

	if (prio_type[i] == prio_link)
	reg \|= IXGBE_RTRPT4C_LSP;

	IXGBE_WRITE_REG(hw, IXGBE_RTRPT4C(i), reg);
	}

	/*
	* Configure Rx packet plane (recycle mode; WSP) and
	* enable arbiter
	*/
	reg = IXGBE_RTRPCS_RRM \| IXGBE_RTRPCS_RAC;
	IXGBE_WRITE_REG(hw, IXGBE_RTRPCS, reg);

	return 0;
	}

	/**
	* ixgbe_dcb_config_tx_desc_arbiter_82599 - Config Tx Desc. arbiter
	* @hw: pointer to hardware structure
	* @refill: refill credits index by traffic class
	* @max: max credits index by traffic class
	* @bwg_id: bandwidth grouping indexed by traffic class
	* @prio_type: priority type indexed by traffic class
	*
	* Configure Tx Descriptor Arbiter and credits for each traffic class.
	*/
	s32 ixgbe_dcb_config_tx_desc_arbiter_82599(struct ixgbe_hw *hw,
	u16 *refill,
	u16 *max,
	u8 *bwg_id,
	u8 *prio_type)
	{
	u32 reg, max_credits;
	u8 i;

	/* Clear the per-Tx queue credits; we use per-TC instead */
	for (i = 0; i < 128; i++) {
	IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, i);
	IXGBE_WRITE_REG(hw, IXGBE_RTTDT1C, 0);
	}

	/* Configure traffic class credits and priority */
	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
	max_credits = max[i];
	reg = max_credits << IXGBE_RTTDT2C_MCL_SHIFT;
	reg \|= refill[i];
	reg \|= (u32)(bwg_id[i]) << IXGBE_RTTDT2C_BWG_SHIFT;

	if (prio_type[i] == prio_group)
	reg \|= IXGBE_RTTDT2C_GSP;

	if (prio_type[i] == prio_link)
	reg \|= IXGBE_RTTDT2C_LSP;

	IXGBE_WRITE_REG(hw, IXGBE_RTTDT2C(i), reg);
	}

	/*
	* Configure Tx descriptor plane (recycle mode; WSP) and
	* enable arbiter
	*/
	reg = IXGBE_RTTDCS_TDPAC \| IXGBE_RTTDCS_TDRM;
	IXGBE_WRITE_REG(hw, IXGBE_RTTDCS, reg);

	return 0;
	}

	/**
	* ixgbe_dcb_config_tx_data_arbiter_82599 - Config Tx Data arbiter
	* @hw: pointer to hardware structure
	* @refill: refill credits index by traffic class
	* @max: max credits index by traffic class
	* @bwg_id: bandwidth grouping indexed by traffic class
	* @prio_type: priority type indexed by traffic class
	* @prio_tc: priority to tc assignments indexed by priority
	*
	* Configure Tx Packet Arbiter and credits for each traffic class.
	*/
	s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
	u16 *refill,
	u16 *max,
	u8 *bwg_id,
	u8 *prio_type,
	u8 *prio_tc)
	{
	u32 reg;
	u8 i;

	/*
	* Disable the arbiter before changing parameters
	* (always enable recycle mode; SP; arb delay)
	*/
	reg = IXGBE_RTTPCS_TPPAC \| IXGBE_RTTPCS_TPRM \|
	(IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT) \|
	IXGBE_RTTPCS_ARBDIS;
	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);

	/* Map all traffic classes to their UP */
	reg = 0;
	for (i = 0; i < MAX_USER_PRIORITY; i++)
	reg \|= (prio_tc[i] << (i * IXGBE_RTTUP2TC_UP_SHIFT));
	IXGBE_WRITE_REG(hw, IXGBE_RTTUP2TC, reg);

	/* Configure traffic class credits and priority */
	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
	reg = refill[i];
	reg \|= (u32)(max[i]) << IXGBE_RTTPT2C_MCL_SHIFT;
	reg \|= (u32)(bwg_id[i]) << IXGBE_RTTPT2C_BWG_SHIFT;

	if (prio_type[i] == prio_group)
	reg \|= IXGBE_RTTPT2C_GSP;

	if (prio_type[i] == prio_link)
	reg \|= IXGBE_RTTPT2C_LSP;

	IXGBE_WRITE_REG(hw, IXGBE_RTTPT2C(i), reg);
	}

	/*
	* Configure Tx packet plane (recycle mode; SP; arb delay) and
	* enable arbiter
	*/
	reg = IXGBE_RTTPCS_TPPAC \| IXGBE_RTTPCS_TPRM \|
	(IXGBE_RTTPCS_ARBD_DCB << IXGBE_RTTPCS_ARBD_SHIFT);
	IXGBE_WRITE_REG(hw, IXGBE_RTTPCS, reg);

	return 0;
	}

	/**
	* ixgbe_dcb_config_pfc_82599 - Configure priority flow control
	* @hw: pointer to hardware structure
	* @pfc_en: enabled pfc bitmask
	* @prio_tc: priority to tc assignments indexed by priority
	*
	* Configure Priority Flow Control (PFC) for each traffic class.
	*/
	s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw hw, u8 pfc_en, u8 prio_tc)
	{
	u32 i, j, fcrtl, reg;
	u8 max_tc = 0;

	/* Enable Transmit Priority Flow Control */
	IXGBE_WRITE_REG(hw, IXGBE_FCCFG, IXGBE_FCCFG_TFCE_PRIORITY);

	/* Enable Receive Priority Flow Control */
	reg = IXGBE_READ_REG(hw, IXGBE_MFLCN);
	reg \|= IXGBE_MFLCN_DPF;

	/*
	* X540 & X550 supports per TC Rx priority flow control.
	* So clear all TCs and only enable those that should be
	* enabled.
	*/
	reg &= ~(IXGBE_MFLCN_RPFCE_MASK \| IXGBE_MFLCN_RFCE);

	if (hw->mac.type >= ixgbe_mac_X540)
	reg \|= pfc_en << IXGBE_MFLCN_RPFCE_SHIFT;

	if (pfc_en)
	reg \|= IXGBE_MFLCN_RPFCE;

	IXGBE_WRITE_REG(hw, IXGBE_MFLCN, reg);

	for (i = 0; i < MAX_USER_PRIORITY; i++) {
	if (prio_tc[i] > max_tc)
	max_tc = prio_tc[i];
	}


	/* Configure PFC Tx thresholds per TC */
	for (i = 0; i <= max_tc; i++) {
	int enabled = 0;

	for (j = 0; j < MAX_USER_PRIORITY; j++) {
	if ((prio_tc[j] == i) && (pfc_en & BIT(j))) {
	enabled = 1;
	break;
	}
	}

	if (enabled) {
	reg = (hw->fc.high_water[i] << 10) \| IXGBE_FCRTH_FCEN;
	fcrtl = (hw->fc.low_water[i] << 10) \| IXGBE_FCRTL_XONE;
	IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), fcrtl);
	} else {
	/* In order to prevent Tx hangs when the internal Tx
	* switch is enabled we must set the high water mark
	* to the Rx packet buffer size - 24KB. This allows
	* the Tx switch to function even under heavy Rx
	* workloads.
	*/
	reg = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 24576;
	IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
	}

	IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
	}

	for (; i < MAX_TRAFFIC_CLASS; i++) {
	IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
	IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), 0);
	}

	/* Configure pause time (2 TCs per register) */
	reg = hw->fc.pause_time * 0x00010001;
	for (i = 0; i < (MAX_TRAFFIC_CLASS / 2); i++)
	IXGBE_WRITE_REG(hw, IXGBE_FCTTV(i), reg);

	/* Configure flow control refresh threshold value */
	IXGBE_WRITE_REG(hw, IXGBE_FCRTV, hw->fc.pause_time / 2);

	return 0;
	}

	/**
	* ixgbe_dcb_config_tc_stats_82599 - Config traffic class statistics
	* @hw: pointer to hardware structure
	*
	* Configure queue statistics registers, all queues belonging to same traffic
	* class uses a single set of queue statistics counters.
	*/
	static s32 ixgbe_dcb_config_tc_stats_82599(struct ixgbe_hw *hw)
	{
	u32 reg = 0;
	u8 i = 0;

	/*
	* Receive Queues stats setting
	* 32 RQSMR registers, each configuring 4 queues.
	* Set all 16 queues of each TC to the same stat
	* with TC 'n' going to stat 'n'.
	*/
	for (i = 0; i < 32; i++) {
	reg = 0x01010101 * (i / 4);
	IXGBE_WRITE_REG(hw, IXGBE_RQSMR(i), reg);
	}
	/*
	* Transmit Queues stats setting
	* 32 TQSM registers, each controlling 4 queues.
	* Set all queues of each TC to the same stat
	* with TC 'n' going to stat 'n'.
	* Tx queues are allocated non-uniformly to TCs:
	* 32, 32, 16, 16, 8, 8, 8, 8.
	*/
	for (i = 0; i < 32; i++) {
	if (i < 8)
	reg = 0x00000000;
	else if (i < 16)
	reg = 0x01010101;
	else if (i < 20)
	reg = 0x02020202;
	else if (i < 24)
	reg = 0x03030303;
	else if (i < 26)
	reg = 0x04040404;
	else if (i < 28)
	reg = 0x05050505;
	else if (i < 30)
	reg = 0x06060606;
	else
	reg = 0x07070707;
	IXGBE_WRITE_REG(hw, IXGBE_TQSM(i), reg);
	}

	return 0;
	}

	/**
	* ixgbe_dcb_hw_config_82599 - Configure and enable DCB
	* @hw: pointer to hardware structure
	* @pfc_en: enabled pfc bitmask
	* @refill: refill credits index by traffic class
	* @max: max credits index by traffic class
	* @bwg_id: bandwidth grouping indexed by traffic class
	* @prio_type: priority type indexed by traffic class
	* @prio_tc: priority to tc assignments indexed by priority
	*
	* Configure dcb settings and enable dcb mode.
	*/
	s32 ixgbe_dcb_hw_config_82599(struct ixgbe_hw hw, u8 pfc_en, u16 refill,
	u16 max, u8 bwg_id, u8 prio_type, u8 prio_tc)
	{
	ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max, bwg_id,
	prio_type, prio_tc);
	ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
	bwg_id, prio_type);
	ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max,
	bwg_id, prio_type, prio_tc);
	ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc);
	ixgbe_dcb_config_tc_stats_82599(hw);

	return 0;
	}