drivers/net/ethernet/amd/xgbe/xgbe-dcb.c - linux - Git at Google

 /*
  * AMD 10Gb Ethernet driver
  *
  * This file is available to you under your choice of the following two
  * licenses:
  *
  * License 1: GPLv2
  *
  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
  *
  * This file is free software; you may copy, redistribute and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 2 of the License, or (at
  * your option) any later version.
  *
  * This file is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
  *     and you.
  *
  *     The Software IS NOT an item of Licensed Software or Licensed Product
  *     under any End User Software License Agreement or Agreement for Licensed
  *     Product with Synopsys or any supplement thereto.  Permission is hereby
  *     granted, free of charge, to any person obtaining a copy of this software
  *     annotated with this license and the Software, to deal in the Software
  *     without restriction, including without limitation the rights to use,
  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  *     of the Software, and to permit persons to whom the Software is furnished
  *     to do so, subject to the following conditions:
  *
  *     The above copyright notice and this permission notice shall be included
  *     in all copies or substantial portions of the Software.
  *
  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  *     THE POSSIBILITY OF SUCH DAMAGE.
  *
  *
  * License 2: Modified BSD
  *
  * Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
  *       notice, this list of conditions and the following disclaimer in the
  *       documentation and/or other materials provided with the distribution.
  *     * Neither the name of Advanced Micro Devices, Inc. nor the
  *       names of its contributors may be used to endorse or promote products
  *       derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *     The Synopsys DWC ETHER XGMAC Software Driver and documentation
  *     (hereinafter "Software") is an unsupported proprietary work of Synopsys,
  *     Inc. unless otherwise expressly agreed to in writing between Synopsys
  *     and you.
  *
  *     The Software IS NOT an item of Licensed Software or Licensed Product
  *     under any End User Software License Agreement or Agreement for Licensed
  *     Product with Synopsys or any supplement thereto.  Permission is hereby
  *     granted, free of charge, to any person obtaining a copy of this software
  *     annotated with this license and the Software, to deal in the Software
  *     without restriction, including without limitation the rights to use,
  *     copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  *     of the Software, and to permit persons to whom the Software is furnished
  *     to do so, subject to the following conditions:
  *
  *     The above copyright notice and this permission notice shall be included
  *     in all copies or substantial portions of the Software.
  *
  *     THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
  *     BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  *     TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  *     PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
  *     BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  *     CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  *     SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  *     INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  *     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  *     THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include <linux/netdevice.h>
 #include <net/dcbnl.h>

 #include "xgbe.h"
 #include "xgbe-common.h"

 static int xgbe_dcb_ieee_getets(struct net_device *netdev,
 				struct ieee_ets *ets)
 {
 	struct xgbe_prv_data *pdata = netdev_priv(netdev);

 	/* Set number of supported traffic classes */
 	ets->ets_cap = pdata->hw_feat.tc_cnt;

 	if (pdata->ets) {
 		ets->cbs = pdata->ets->cbs;
 		memcpy(ets->tc_tx_bw, pdata->ets->tc_tx_bw,
 		       sizeof(ets->tc_tx_bw));
 		memcpy(ets->tc_tsa, pdata->ets->tc_tsa,
 		       sizeof(ets->tc_tsa));
 		memcpy(ets->prio_tc, pdata->ets->prio_tc,
 		       sizeof(ets->prio_tc));
 	}

 	return 0;
 }

 static int xgbe_dcb_ieee_setets(struct net_device *netdev,
 				struct ieee_ets *ets)
 {
 	struct xgbe_prv_data *pdata = netdev_priv(netdev);
 	unsigned int i, tc_ets, tc_ets_weight;
 	u8 max_tc = 0;

 	tc_ets = 0;
 	tc_ets_weight = 0;
 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 		netif_dbg(pdata, drv, netdev,
 			  "TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
 			  ets->tc_tx_bw[i], ets->tc_rx_bw[i],
 			  ets->tc_tsa[i]);
 		netif_dbg(pdata, drv, netdev, "PRIO%u: TC=%hhu\n", i,
 			  ets->prio_tc[i]);

 		max_tc = max_t(u8, max_tc, ets->prio_tc[i]);
 		if ((ets->tc_tx_bw[i] || ets->tc_tsa[i]))
 			max_tc = max_t(u8, max_tc, i);

 		switch (ets->tc_tsa[i]) {
 		case IEEE_8021QAZ_TSA_STRICT:
 			break;
 		case IEEE_8021QAZ_TSA_ETS:
 			tc_ets = 1;
 			tc_ets_weight += ets->tc_tx_bw[i];
 			break;
 		default:
 			netif_err(pdata, drv, netdev,
 				  "unsupported TSA algorithm (%hhu)\n",
 				  ets->tc_tsa[i]);
 			return -EINVAL;
 		}
 	}

 	/* Check maximum traffic class requested */
 	if (max_tc >= pdata->hw_feat.tc_cnt) {
 		netif_err(pdata, drv, netdev,
 			  "exceeded number of supported traffic classes\n");
 		return -EINVAL;
 	}

 	/* Weights must add up to 100% */
 	if (tc_ets && (tc_ets_weight != 100)) {
 		netif_err(pdata, drv, netdev,
 			  "sum of ETS algorithm weights is not 100 (%u)\n",
 			  tc_ets_weight);
 		return -EINVAL;
 	}

 	if (!pdata->ets) {
 		pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
 					  GFP_KERNEL);
 		if (!pdata->ets)
 			return -ENOMEM;
 	}

 	pdata->num_tcs = max_tc + 1;
 	memcpy(pdata->ets, ets, sizeof(*pdata->ets));

 	pdata->hw_if.config_dcb_tc(pdata);

 	return 0;
 }

 static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
 				struct ieee_pfc *pfc)
 {
 	struct xgbe_prv_data *pdata = netdev_priv(netdev);

 	/* Set number of supported PFC traffic classes */
 	pfc->pfc_cap = pdata->hw_feat.tc_cnt;

 	if (pdata->pfc) {
 		pfc->pfc_en = pdata->pfc->pfc_en;
 		pfc->mbc = pdata->pfc->mbc;
 		pfc->delay = pdata->pfc->delay;
 	}

 	return 0;
 }

 static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
 				struct ieee_pfc *pfc)
 {
 	struct xgbe_prv_data *pdata = netdev_priv(netdev);

 	netif_dbg(pdata, drv, netdev,
 		  "cap=%d, en=%#x, mbc=%d, delay=%d\n",
 		  pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);

 	/* Check PFC for supported number of traffic classes */
 	if (pfc->pfc_en & ~((1 << pdata->hw_feat.tc_cnt) - 1)) {
 		netif_err(pdata, drv, netdev,
 			  "PFC requested for unsupported traffic class\n");
 		return -EINVAL;
 	}

 	if (!pdata->pfc) {
 		pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
 					  GFP_KERNEL);
 		if (!pdata->pfc)
 			return -ENOMEM;
 	}

 	memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));

 	pdata->hw_if.config_dcb_pfc(pdata);

 	return 0;
 }

 static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
 {
 	return DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_IEEE;
 }

 static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
 {
 	struct xgbe_prv_data *pdata = netdev_priv(netdev);
 	u8 support = xgbe_dcb_getdcbx(netdev);

 	netif_dbg(pdata, drv, netdev, "DCBX=%#hhx\n", dcbx);

 	if (dcbx & ~support)
 		return 1;

 	if ((dcbx & support) != support)
 		return 1;

 	return 0;
 }

 static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
 	/* IEEE 802.1Qaz std */
 	.ieee_getets = xgbe_dcb_ieee_getets,
 	.ieee_setets = xgbe_dcb_ieee_setets,
 	.ieee_getpfc = xgbe_dcb_ieee_getpfc,
 	.ieee_setpfc = xgbe_dcb_ieee_setpfc,

 	/* DCBX configuration */
 	.getdcbx     = xgbe_dcb_getdcbx,
 	.setdcbx     = xgbe_dcb_setdcbx,
 };

 const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
 {
 	return &xgbe_dcbnl_ops;
 }
	/*
	* AMD 10Gb Ethernet driver
	*
	* This file is available to you under your choice of the following two
	* licenses:
	*
	* License 1: GPLv2
	*
	* Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
	*
	* This file is free software; you may copy, redistribute and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 2 of the License, or (at
	* your option) any later version.
	*
	* This file is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* This file incorporates work covered by the following copyright and
	* permission notice:
	* The Synopsys DWC ETHER XGMAC Software Driver and documentation
	* (hereinafter "Software") is an unsupported proprietary work of Synopsys,
	* Inc. unless otherwise expressly agreed to in writing between Synopsys
	* and you.
	*
	* The Software IS NOT an item of Licensed Software or Licensed Product
	* under any End User Software License Agreement or Agreement for Licensed
	* Product with Synopsys or any supplement thereto. Permission is hereby
	* granted, free of charge, to any person obtaining a copy of this software
	* annotated with this license and the Software, to deal in the Software
	* without restriction, including without limitation the rights to use,
	* copy, modify, merge, publish, distribute, sublicense, and/or sell copies
	* of the Software, and to permit persons to whom the Software is furnished
	* to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included
	* in all copies or substantial portions of the Software.
	*
	* THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
	* BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	* PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*
	*
	* License 2: Modified BSD
	*
	* Copyright (c) 2014-2016 Advanced Micro Devices, Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* * Neither the name of Advanced Micro Devices, Inc. nor the
	* names of its contributors may be used to endorse or promote products
	* derived from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	* This file incorporates work covered by the following copyright and
	* permission notice:
	* The Synopsys DWC ETHER XGMAC Software Driver and documentation
	* (hereinafter "Software") is an unsupported proprietary work of Synopsys,
	* Inc. unless otherwise expressly agreed to in writing between Synopsys
	* and you.
	*
	* The Software IS NOT an item of Licensed Software or Licensed Product
	* under any End User Software License Agreement or Agreement for Licensed
	* Product with Synopsys or any supplement thereto. Permission is hereby
	* granted, free of charge, to any person obtaining a copy of this software
	* annotated with this license and the Software, to deal in the Software
	* without restriction, including without limitation the rights to use,
	* copy, modify, merge, publish, distribute, sublicense, and/or sell copies
	* of the Software, and to permit persons to whom the Software is furnished
	* to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included
	* in all copies or substantial portions of the Software.
	*
	* THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
	* BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	* PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <linux/netdevice.h>
	#include <net/dcbnl.h>

	#include "xgbe.h"
	#include "xgbe-common.h"

	static int xgbe_dcb_ieee_getets(struct net_device *netdev,
	struct ieee_ets *ets)
	{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	/* Set number of supported traffic classes */
	ets->ets_cap = pdata->hw_feat.tc_cnt;

	if (pdata->ets) {
	ets->cbs = pdata->ets->cbs;
	memcpy(ets->tc_tx_bw, pdata->ets->tc_tx_bw,
	sizeof(ets->tc_tx_bw));
	memcpy(ets->tc_tsa, pdata->ets->tc_tsa,
	sizeof(ets->tc_tsa));
	memcpy(ets->prio_tc, pdata->ets->prio_tc,
	sizeof(ets->prio_tc));
	}

	return 0;
	}

	static int xgbe_dcb_ieee_setets(struct net_device *netdev,
	struct ieee_ets *ets)
	{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	unsigned int i, tc_ets, tc_ets_weight;
	u8 max_tc = 0;

	tc_ets = 0;
	tc_ets_weight = 0;
	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
	netif_dbg(pdata, drv, netdev,
	"TC%u: tx_bw=%hhu, rx_bw=%hhu, tsa=%hhu\n", i,
	ets->tc_tx_bw[i], ets->tc_rx_bw[i],
	ets->tc_tsa[i]);
	netif_dbg(pdata, drv, netdev, "PRIO%u: TC=%hhu\n", i,
	ets->prio_tc[i]);

	max_tc = max_t(u8, max_tc, ets->prio_tc[i]);
	if ((ets->tc_tx_bw[i] \|\| ets->tc_tsa[i]))
	max_tc = max_t(u8, max_tc, i);

	switch (ets->tc_tsa[i]) {
	case IEEE_8021QAZ_TSA_STRICT:
	break;
	case IEEE_8021QAZ_TSA_ETS:
	tc_ets = 1;
	tc_ets_weight += ets->tc_tx_bw[i];
	break;
	default:
	netif_err(pdata, drv, netdev,
	"unsupported TSA algorithm (%hhu)\n",
	ets->tc_tsa[i]);
	return -EINVAL;
	}
	}

	/* Check maximum traffic class requested */
	if (max_tc >= pdata->hw_feat.tc_cnt) {
	netif_err(pdata, drv, netdev,
	"exceeded number of supported traffic classes\n");
	return -EINVAL;
	}

	/* Weights must add up to 100% */
	if (tc_ets && (tc_ets_weight != 100)) {
	netif_err(pdata, drv, netdev,
	"sum of ETS algorithm weights is not 100 (%u)\n",
	tc_ets_weight);
	return -EINVAL;
	}

	if (!pdata->ets) {
	pdata->ets = devm_kzalloc(pdata->dev, sizeof(*pdata->ets),
	GFP_KERNEL);
	if (!pdata->ets)
	return -ENOMEM;
	}

	pdata->num_tcs = max_tc + 1;
	memcpy(pdata->ets, ets, sizeof(*pdata->ets));

	pdata->hw_if.config_dcb_tc(pdata);

	return 0;
	}

	static int xgbe_dcb_ieee_getpfc(struct net_device *netdev,
	struct ieee_pfc *pfc)
	{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	/* Set number of supported PFC traffic classes */
	pfc->pfc_cap = pdata->hw_feat.tc_cnt;

	if (pdata->pfc) {
	pfc->pfc_en = pdata->pfc->pfc_en;
	pfc->mbc = pdata->pfc->mbc;
	pfc->delay = pdata->pfc->delay;
	}

	return 0;
	}

	static int xgbe_dcb_ieee_setpfc(struct net_device *netdev,
	struct ieee_pfc *pfc)
	{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	netif_dbg(pdata, drv, netdev,
	"cap=%d, en=%#x, mbc=%d, delay=%d\n",
	pfc->pfc_cap, pfc->pfc_en, pfc->mbc, pfc->delay);

	/* Check PFC for supported number of traffic classes */
	if (pfc->pfc_en & ~((1 << pdata->hw_feat.tc_cnt) - 1)) {
	netif_err(pdata, drv, netdev,
	"PFC requested for unsupported traffic class\n");
	return -EINVAL;
	}

	if (!pdata->pfc) {
	pdata->pfc = devm_kzalloc(pdata->dev, sizeof(*pdata->pfc),
	GFP_KERNEL);
	if (!pdata->pfc)
	return -ENOMEM;
	}

	memcpy(pdata->pfc, pfc, sizeof(*pdata->pfc));

	pdata->hw_if.config_dcb_pfc(pdata);

	return 0;
	}

	static u8 xgbe_dcb_getdcbx(struct net_device *netdev)
	{
	return DCB_CAP_DCBX_HOST \| DCB_CAP_DCBX_VER_IEEE;
	}

	static u8 xgbe_dcb_setdcbx(struct net_device *netdev, u8 dcbx)
	{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	u8 support = xgbe_dcb_getdcbx(netdev);

	netif_dbg(pdata, drv, netdev, "DCBX=%#hhx\n", dcbx);

	if (dcbx & ~support)
	return 1;

	if ((dcbx & support) != support)
	return 1;

	return 0;
	}

	static const struct dcbnl_rtnl_ops xgbe_dcbnl_ops = {
	/* IEEE 802.1Qaz std */
	.ieee_getets = xgbe_dcb_ieee_getets,
	.ieee_setets = xgbe_dcb_ieee_setets,
	.ieee_getpfc = xgbe_dcb_ieee_getpfc,
	.ieee_setpfc = xgbe_dcb_ieee_setpfc,

	/* DCBX configuration */
	.getdcbx = xgbe_dcb_getdcbx,
	.setdcbx = xgbe_dcb_setdcbx,
	};

	const struct dcbnl_rtnl_ops *xgbe_get_dcbnl_ops(void)
	{
	return &xgbe_dcbnl_ops;
	}