drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_nl.c

/*******************************************************************************

  Intel 10 Gigabit PCI Express Linux driver
  Copyright(c) 1999 - 2014 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "ixgbe.h"
#include <linux/dcbnl.h>
#include "ixgbe_dcb_82598.h"
#include "ixgbe_dcb_82599.h"
#include "ixgbe_sriov.h"

/* Callbacks for DCB netlink in the kernel */
#define BIT_DCB_MODE	0x01
#define BIT_PFC		0x02
#define BIT_PG_RX	0x04
#define BIT_PG_TX	0x08
#define BIT_APP_UPCHG	0x10
#define BIT_LINKSPEED   0x80

/* Responses for the DCB_C_SET_ALL command */
#define DCB_HW_CHG_RST  0  /* DCB configuration changed with reset */
#define DCB_NO_HW_CHG   1  /* DCB configuration did not change */
#define DCB_HW_CHG      2  /* DCB configuration changed, no reset */

static int ixgbe_copy_dcb_cfg(struct ixgbe_adapter *adapter, int tc_max)
{
	struct ixgbe_dcb_config *scfg = &adapter->temp_dcb_cfg;
	struct ixgbe_dcb_config *dcfg = &adapter->dcb_cfg;
	struct tc_configuration *src = NULL;
	struct tc_configuration *dst = NULL;
	int i, j;
	int tx = DCB_TX_CONFIG;
	int rx = DCB_RX_CONFIG;
	int changes = 0;
#ifdef IXGBE_FCOE
	struct dcb_app app = {
			      .selector = DCB_APP_IDTYPE_ETHTYPE,
			      .protocol = ETH_P_FCOE,
			     };
	u8 up = dcb_getapp(adapter->netdev, &app);

	if (up && !(up & BIT(adapter->fcoe.up)))
		changes |= BIT_APP_UPCHG;
#endif

	for (i = DCB_PG_ATTR_TC_0; i < tc_max + DCB_PG_ATTR_TC_0; i++) {
		src = &scfg->tc_config[i - DCB_PG_ATTR_TC_0];
		dst = &dcfg->tc_config[i - DCB_PG_ATTR_TC_0];

		if (dst->path[tx].prio_type != src->path[tx].prio_type) {
			dst->path[tx].prio_type = src->path[tx].prio_type;
			changes |= BIT_PG_TX;
		}

		if (dst->path[tx].bwg_id != src->path[tx].bwg_id) {
			dst->path[tx].bwg_id = src->path[tx].bwg_id;
			changes |= BIT_PG_TX;
		}

		if (dst->path[tx].bwg_percent != src->path[tx].bwg_percent) {
			dst->path[tx].bwg_percent = src->path[tx].bwg_percent;
			changes |= BIT_PG_TX;
		}

		if (dst->path[tx].up_to_tc_bitmap !=
				src->path[tx].up_to_tc_bitmap) {
			dst->path[tx].up_to_tc_bitmap =
				src->path[tx].up_to_tc_bitmap;
			changes |= (BIT_PG_TX | BIT_PFC | BIT_APP_UPCHG);
		}

		if (dst->path[rx].prio_type != src->path[rx].prio_type) {
			dst->path[rx].prio_type = src->path[rx].prio_type;
			changes |= BIT_PG_RX;
		}

		if (dst->path[rx].bwg_id != src->path[rx].bwg_id) {
			dst->path[rx].bwg_id = src->path[rx].bwg_id;
			changes |= BIT_PG_RX;
		}

		if (dst->path[rx].bwg_percent != src->path[rx].bwg_percent) {
			dst->path[rx].bwg_percent = src->path[rx].bwg_percent;
			changes |= BIT_PG_RX;
		}

		if (dst->path[rx].up_to_tc_bitmap !=
				src->path[rx].up_to_tc_bitmap) {
			dst->path[rx].up_to_tc_bitmap =
				src->path[rx].up_to_tc_bitmap;
			changes |= (BIT_PG_RX | BIT_PFC | BIT_APP_UPCHG);
		}
	}

	for (i = DCB_PG_ATTR_BW_ID_0; i < DCB_PG_ATTR_BW_ID_MAX; i++) {
		j = i - DCB_PG_ATTR_BW_ID_0;
		if (dcfg->bw_percentage[tx][j] != scfg->bw_percentage[tx][j]) {
			dcfg->bw_percentage[tx][j] = scfg->bw_percentage[tx][j];
			changes |= BIT_PG_TX;
		}
		if (dcfg->bw_percentage[rx][j] != scfg->bw_percentage[rx][j]) {
			dcfg->bw_percentage[rx][j] = scfg->bw_percentage[rx][j];
			changes |= BIT_PG_RX;
		}
	}

	for (i = DCB_PFC_UP_ATTR_0; i < DCB_PFC_UP_ATTR_MAX; i++) {
		j = i - DCB_PFC_UP_ATTR_0;
		if (dcfg->tc_config[j].dcb_pfc != scfg->tc_config[j].dcb_pfc) {
			dcfg->tc_config[j].dcb_pfc = scfg->tc_config[j].dcb_pfc;
			changes |= BIT_PFC;
		}
	}

	if (dcfg->pfc_mode_enable != scfg->pfc_mode_enable) {
		dcfg->pfc_mode_enable = scfg->pfc_mode_enable;
		changes |= BIT_PFC;
	}

	return changes;
}

static u8 ixgbe_dcbnl_get_state(struct net_device *netdev)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	return !!(adapter->flags & IXGBE_FLAG_DCB_ENABLED);
}

static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	/* Fail command if not in CEE mode */
	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
		return 1;

	/* verify there is something to do, if not then exit */
	if (!state == !(adapter->flags & IXGBE_FLAG_DCB_ENABLED))
		return 0;

	return !!ixgbe_setup_tc(netdev,
				state ? adapter->dcb_cfg.num_tcs.pg_tcs : 0);
}

static void ixgbe_dcbnl_get_perm_hw_addr(struct net_device *netdev,
					 u8 *perm_addr)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	int i, j;

	memset(perm_addr, 0xff, MAX_ADDR_LEN);

	for (i = 0; i < netdev->addr_len; i++)
		perm_addr[i] = adapter->hw.mac.perm_addr[i];

	switch (adapter->hw.mac.type) {
	case ixgbe_mac_82599EB:
	case ixgbe_mac_X540:
	case ixgbe_mac_X550:
		for (j = 0; j < netdev->addr_len; j++, i++)
			perm_addr[i] = adapter->hw.mac.san_addr[j];
		break;
	default:
		break;
	}
}

static void ixgbe_dcbnl_set_pg_tc_cfg_tx(struct net_device *netdev, int tc,
					 u8 prio, u8 bwg_id, u8 bw_pct,
					 u8 up_map)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	if (prio != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[0].prio_type = prio;
	if (bwg_id != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_id = bwg_id;
	if (bw_pct != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[0].bwg_percent =
			bw_pct;
	if (up_map != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap =
			up_map;
}

static void ixgbe_dcbnl_set_pg_bwg_cfg_tx(struct net_device *netdev, int bwg_id,
					  u8 bw_pct)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	adapter->temp_dcb_cfg.bw_percentage[0][bwg_id] = bw_pct;
}

static void ixgbe_dcbnl_set_pg_tc_cfg_rx(struct net_device *netdev, int tc,
					 u8 prio, u8 bwg_id, u8 bw_pct,
					 u8 up_map)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	if (prio != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[1].prio_type = prio;
	if (bwg_id != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_id = bwg_id;
	if (bw_pct != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[1].bwg_percent =
			bw_pct;
	if (up_map != DCB_ATTR_VALUE_UNDEFINED)
		adapter->temp_dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap =
			up_map;
}

static void ixgbe_dcbnl_set_pg_bwg_cfg_rx(struct net_device *netdev, int bwg_id,
					  u8 bw_pct)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	adapter->temp_dcb_cfg.bw_percentage[1][bwg_id] = bw_pct;
}

static void ixgbe_dcbnl_get_pg_tc_cfg_tx(struct net_device *netdev, int tc,
					 u8 *prio, u8 *bwg_id, u8 *bw_pct,
					 u8 *up_map)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	*prio = adapter->dcb_cfg.tc_config[tc].path[0].prio_type;
	*bwg_id = adapter->dcb_cfg.tc_config[tc].path[0].bwg_id;
	*bw_pct = adapter->dcb_cfg.tc_config[tc].path[0].bwg_percent;
	*up_map = adapter->dcb_cfg.tc_config[tc].path[0].up_to_tc_bitmap;
}

static void ixgbe_dcbnl_get_pg_bwg_cfg_tx(struct net_device *netdev, int bwg_id,
					  u8 *bw_pct)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	*bw_pct = adapter->dcb_cfg.bw_percentage[0][bwg_id];
}

static void ixgbe_dcbnl_get_pg_tc_cfg_rx(struct net_device *netdev, int tc,
					 u8 *prio, u8 *bwg_id, u8 *bw_pct,
					 u8 *up_map)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	*prio = adapter->dcb_cfg.tc_config[tc].path[1].prio_type;
	*bwg_id = adapter->dcb_cfg.tc_config[tc].path[1].bwg_id;
	*bw_pct = adapter->dcb_cfg.tc_config[tc].path[1].bwg_percent;
	*up_map = adapter->dcb_cfg.tc_config[tc].path[1].up_to_tc_bitmap;
}

static void ixgbe_dcbnl_get_pg_bwg_cfg_rx(struct net_device *netdev, int bwg_id,
					  u8 *bw_pct)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	*bw_pct = adapter->dcb_cfg.bw_percentage[1][bwg_id];
}

static void ixgbe_dcbnl_set_pfc_cfg(struct net_device *netdev, int priority,
				    u8 setting)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc = setting;
	if (adapter->temp_dcb_cfg.tc_config[priority].dcb_pfc !=
	    adapter->dcb_cfg.tc_config[priority].dcb_pfc)
		adapter->temp_dcb_cfg.pfc_mode_enable = true;
}

static void ixgbe_dcbnl_get_pfc_cfg(struct net_device *netdev, int priority,
				    u8 *setting)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	*setting = adapter->dcb_cfg.tc_config[priority].dcb_pfc;
}

static void ixgbe_dcbnl_devreset(struct net_device *dev)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);

	while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
		usleep_range(1000, 2000);

	if (netif_running(dev))
		dev->netdev_ops->ndo_stop(dev);

	ixgbe_clear_interrupt_scheme(adapter);
	ixgbe_init_interrupt_scheme(adapter);

	if (netif_running(dev))
		dev->netdev_ops->ndo_open(dev);

	clear_bit(__IXGBE_RESETTING, &adapter->state);
}

static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	struct ixgbe_dcb_config *dcb_cfg = &adapter->dcb_cfg;
	struct ixgbe_hw *hw = &adapter->hw;
	int ret = DCB_NO_HW_CHG;
	int i;

	/* Fail command if not in CEE mode */
	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
		return DCB_NO_HW_CHG;

	adapter->dcb_set_bitmap |= ixgbe_copy_dcb_cfg(adapter,
						      MAX_TRAFFIC_CLASS);
	if (!adapter->dcb_set_bitmap)
		return DCB_NO_HW_CHG;

	if (adapter->dcb_set_bitmap & (BIT_PG_TX|BIT_PG_RX)) {
		u16 refill[MAX_TRAFFIC_CLASS], max[MAX_TRAFFIC_CLASS];
		u8 bwg_id[MAX_TRAFFIC_CLASS], prio_type[MAX_TRAFFIC_CLASS];
		/* Priority to TC mapping in CEE case default to 1:1 */
		u8 prio_tc[MAX_USER_PRIORITY];
		int max_frame = adapter->netdev->mtu + ETH_HLEN + ETH_FCS_LEN;

#ifdef IXGBE_FCOE
		if (adapter->netdev->features & NETIF_F_FCOE_MTU)
			max_frame = max(max_frame, IXGBE_FCOE_JUMBO_FRAME_SIZE);
#endif

		ixgbe_dcb_calculate_tc_credits(hw, dcb_cfg, max_frame,
					       DCB_TX_CONFIG);
		ixgbe_dcb_calculate_tc_credits(hw, dcb_cfg, max_frame,
					       DCB_RX_CONFIG);

		ixgbe_dcb_unpack_refill(dcb_cfg, DCB_TX_CONFIG, refill);
		ixgbe_dcb_unpack_max(dcb_cfg, max);
		ixgbe_dcb_unpack_bwgid(dcb_cfg, DCB_TX_CONFIG, bwg_id);
		ixgbe_dcb_unpack_prio(dcb_cfg, DCB_TX_CONFIG, prio_type);
		ixgbe_dcb_unpack_map(dcb_cfg, DCB_TX_CONFIG, prio_tc);

		ixgbe_dcb_hw_ets_config(hw, refill, max, bwg_id,
					prio_type, prio_tc);

		for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
			netdev_set_prio_tc_map(netdev, i, prio_tc[i]);

		ret = DCB_HW_CHG_RST;
	}

	if (adapter->dcb_set_bitmap & BIT_PFC) {
		if (dcb_cfg->pfc_mode_enable) {
			u8 pfc_en;
			u8 prio_tc[MAX_USER_PRIORITY];

			ixgbe_dcb_unpack_map(dcb_cfg, DCB_TX_CONFIG, prio_tc);
			ixgbe_dcb_unpack_pfc(dcb_cfg, &pfc_en);
			ixgbe_dcb_hw_pfc_config(hw, pfc_en, prio_tc);
		} else {
			hw->mac.ops.fc_enable(hw);
		}

		ixgbe_set_rx_drop_en(adapter);

		ret = DCB_HW_CHG;
	}

#ifdef IXGBE_FCOE
	/* Reprogam FCoE hardware offloads when the traffic class
	 * FCoE is using changes. This happens if the APP info
	 * changes or the up2tc mapping is updated.
	 */
	if (adapter->dcb_set_bitmap & BIT_APP_UPCHG) {
		struct dcb_app app = {
				      .selector = DCB_APP_IDTYPE_ETHTYPE,
				      .protocol = ETH_P_FCOE,
				     };
		u8 up = dcb_getapp(netdev, &app);

		adapter->fcoe.up = ffs(up) - 1;
		ixgbe_dcbnl_devreset(netdev);
		ret = DCB_HW_CHG_RST;
	}
#endif

	adapter->dcb_set_bitmap = 0x00;
	return ret;
}

static u8 ixgbe_dcbnl_getcap(struct net_device *netdev, int capid, u8 *cap)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	switch (capid) {
	case DCB_CAP_ATTR_PG:
		*cap = true;
		break;
	case DCB_CAP_ATTR_PFC:
		*cap = true;
		break;
	case DCB_CAP_ATTR_UP2TC:
		*cap = false;
		break;
	case DCB_CAP_ATTR_PG_TCS:
		*cap = 0x80;
		break;
	case DCB_CAP_ATTR_PFC_TCS:
		*cap = 0x80;
		break;
	case DCB_CAP_ATTR_GSP:
		*cap = true;
		break;
	case DCB_CAP_ATTR_BCN:
		*cap = false;
		break;
	case DCB_CAP_ATTR_DCBX:
		*cap = adapter->dcbx_cap;
		break;
	default:
		*cap = false;
		break;
	}

	return 0;
}

static int ixgbe_dcbnl_getnumtcs(struct net_device *netdev, int tcid, u8 *num)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
		switch (tcid) {
		case DCB_NUMTCS_ATTR_PG:
			*num = adapter->dcb_cfg.num_tcs.pg_tcs;
			break;
		case DCB_NUMTCS_ATTR_PFC:
			*num = adapter->dcb_cfg.num_tcs.pfc_tcs;
			break;
		default:
			return -EINVAL;
		}
	} else {
		return -EINVAL;
	}

	return 0;
}

static int ixgbe_dcbnl_setnumtcs(struct net_device *netdev, int tcid, u8 num)
{
	return -EINVAL;
}

static u8 ixgbe_dcbnl_getpfcstate(struct net_device *netdev)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	return adapter->dcb_cfg.pfc_mode_enable;
}

static void ixgbe_dcbnl_setpfcstate(struct net_device *netdev, u8 state)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);

	adapter->temp_dcb_cfg.pfc_mode_enable = state;
}

/**
 * ixgbe_dcbnl_getapp - retrieve the DCBX application user priority
 * @netdev : the corresponding netdev
 * @idtype : identifies the id as ether type or TCP/UDP port number
 * @id: id is either ether type or TCP/UDP port number
 *
 * Returns : on success, returns a non-zero 802.1p user priority bitmap
 * otherwise returns -EINVAL as the invalid user priority bitmap to indicate an
 * error.
 */
static int ixgbe_dcbnl_getapp(struct net_device *netdev, u8 idtype, u16 id)
{
	struct ixgbe_adapter *adapter = netdev_priv(netdev);
	struct dcb_app app = {
				.selector = idtype,
				.protocol = id,
			     };

	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_CEE))
		return -EINVAL;

	return dcb_getapp(netdev, &app);
}

static int ixgbe_dcbnl_ieee_getets(struct net_device *dev,
				   struct ieee_ets *ets)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	struct ieee_ets *my_ets = adapter->ixgbe_ieee_ets;

	ets->ets_cap = adapter->dcb_cfg.num_tcs.pg_tcs;

	/* No IEEE PFC settings available */
	if (!my_ets)
		return 0;

	ets->cbs = my_ets->cbs;
	memcpy(ets->tc_tx_bw, my_ets->tc_tx_bw, sizeof(ets->tc_tx_bw));
	memcpy(ets->tc_rx_bw, my_ets->tc_rx_bw, sizeof(ets->tc_rx_bw));
	memcpy(ets->tc_tsa, my_ets->tc_tsa, sizeof(ets->tc_tsa));
	memcpy(ets->prio_tc, my_ets->prio_tc, sizeof(ets->prio_tc));
	return 0;
}

static int ixgbe_dcbnl_ieee_setets(struct net_device *dev,
				   struct ieee_ets *ets)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	int max_frame = dev->mtu + ETH_HLEN + ETH_FCS_LEN;
	int i, err;
	__u8 max_tc = 0;
	__u8 map_chg = 0;

	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
		return -EINVAL;

	if (!adapter->ixgbe_ieee_ets) {
		adapter->ixgbe_ieee_ets = kmalloc(sizeof(struct ieee_ets),
						  GFP_KERNEL);
		if (!adapter->ixgbe_ieee_ets)
			return -ENOMEM;

		/* initialize UP2TC mappings to invalid value */
		for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
			adapter->ixgbe_ieee_ets->prio_tc[i] =
				IEEE_8021QAZ_MAX_TCS;
		/* if possible update UP2TC mappings from HW */
		ixgbe_dcb_read_rtrup2tc(&adapter->hw,
					adapter->ixgbe_ieee_ets->prio_tc);
	}

	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
		if (ets->prio_tc[i] > max_tc)
			max_tc = ets->prio_tc[i];
		if (ets->prio_tc[i] != adapter->ixgbe_ieee_ets->prio_tc[i])
			map_chg = 1;
	}

	memcpy(adapter->ixgbe_ieee_ets, ets, sizeof(*adapter->ixgbe_ieee_ets));

	if (max_tc)
		max_tc++;

	if (max_tc > adapter->dcb_cfg.num_tcs.pg_tcs)
		return -EINVAL;

	if (max_tc != netdev_get_num_tc(dev)) {
		err = ixgbe_setup_tc(dev, max_tc);
		if (err)
			return err;
	} else if (map_chg) {
		ixgbe_dcbnl_devreset(dev);
	}

	return ixgbe_dcb_hw_ets(&adapter->hw, ets, max_frame);
}

static int ixgbe_dcbnl_ieee_getpfc(struct net_device *dev,
				   struct ieee_pfc *pfc)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	struct ieee_pfc *my_pfc = adapter->ixgbe_ieee_pfc;
	int i;

	pfc->pfc_cap = adapter->dcb_cfg.num_tcs.pfc_tcs;

	/* No IEEE PFC settings available */
	if (!my_pfc)
		return 0;

	pfc->pfc_en = my_pfc->pfc_en;
	pfc->mbc = my_pfc->mbc;
	pfc->delay = my_pfc->delay;

	for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
		pfc->requests[i] = adapter->stats.pxoffrxc[i];
		pfc->indications[i] = adapter->stats.pxofftxc[i];
	}

	return 0;
}

static int ixgbe_dcbnl_ieee_setpfc(struct net_device *dev,
				   struct ieee_pfc *pfc)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	struct ixgbe_hw *hw = &adapter->hw;
	u8 *prio_tc;
	int err;

	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
		return -EINVAL;

	if (!adapter->ixgbe_ieee_pfc) {
		adapter->ixgbe_ieee_pfc = kmalloc(sizeof(struct ieee_pfc),
						  GFP_KERNEL);
		if (!adapter->ixgbe_ieee_pfc)
			return -ENOMEM;
	}

	prio_tc = adapter->ixgbe_ieee_ets->prio_tc;
	memcpy(adapter->ixgbe_ieee_pfc, pfc, sizeof(*adapter->ixgbe_ieee_pfc));

	/* Enable link flow control parameters if PFC is disabled */
	if (pfc->pfc_en)
		err = ixgbe_dcb_hw_pfc_config(hw, pfc->pfc_en, prio_tc);
	else
		err = hw->mac.ops.fc_enable(hw);

	ixgbe_set_rx_drop_en(adapter);

	return err;
}

static int ixgbe_dcbnl_ieee_setapp(struct net_device *dev,
				   struct dcb_app *app)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	int err;

	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
		return -EINVAL;

	err = dcb_ieee_setapp(dev, app);
	if (err)
		return err;

#ifdef IXGBE_FCOE
	if (app->selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
	    app->protocol == ETH_P_FCOE) {
		u8 app_mask = dcb_ieee_getapp_mask(dev, app);

		if (app_mask & BIT(adapter->fcoe.up))
			return 0;

		adapter->fcoe.up = app->priority;
		ixgbe_dcbnl_devreset(dev);
	}
#endif

	/* VF devices should use default UP when available */
	if (app->selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
	    app->protocol == 0) {
		int vf;

		adapter->default_up = app->priority;

		for (vf = 0; vf < adapter->num_vfs; vf++) {
			struct vf_data_storage *vfinfo = &adapter->vfinfo[vf];

			if (!vfinfo->pf_qos)
				ixgbe_set_vmvir(adapter, vfinfo->pf_vlan,
						app->priority, vf);
		}
	}

	return 0;
}

static int ixgbe_dcbnl_ieee_delapp(struct net_device *dev,
				   struct dcb_app *app)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	int err;

	if (!(adapter->dcbx_cap & DCB_CAP_DCBX_VER_IEEE))
		return -EINVAL;

	err = dcb_ieee_delapp(dev, app);

#ifdef IXGBE_FCOE
	if (!err && app->selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
	    app->protocol == ETH_P_FCOE) {
		u8 app_mask = dcb_ieee_getapp_mask(dev, app);

		if (app_mask & BIT(adapter->fcoe.up))
			return 0;

		adapter->fcoe.up = app_mask ?
				   ffs(app_mask) - 1 : IXGBE_FCOE_DEFTC;
		ixgbe_dcbnl_devreset(dev);
	}
#endif
	/* IF default priority is being removed clear VF default UP */
	if (app->selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
	    app->protocol == 0 && adapter->default_up == app->priority) {
		int vf;
		long unsigned int app_mask = dcb_ieee_getapp_mask(dev, app);
		int qos = app_mask ? find_first_bit(&app_mask, 8) : 0;

		adapter->default_up = qos;

		for (vf = 0; vf < adapter->num_vfs; vf++) {
			struct vf_data_storage *vfinfo = &adapter->vfinfo[vf];

			if (!vfinfo->pf_qos)
				ixgbe_set_vmvir(adapter, vfinfo->pf_vlan,
						qos, vf);
		}
	}

	return err;
}

static u8 ixgbe_dcbnl_getdcbx(struct net_device *dev)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	return adapter->dcbx_cap;
}

static u8 ixgbe_dcbnl_setdcbx(struct net_device *dev, u8 mode)
{
	struct ixgbe_adapter *adapter = netdev_priv(dev);
	struct ieee_ets ets = {0};
	struct ieee_pfc pfc = {0};
	int err = 0;

	/* no support for LLD_MANAGED modes or CEE+IEEE */
	if ((mode & DCB_CAP_DCBX_LLD_MANAGED) ||
	    ((mode & DCB_CAP_DCBX_VER_IEEE) && (mode & DCB_CAP_DCBX_VER_CEE)) ||
	    !(mode & DCB_CAP_DCBX_HOST))
		return 1;

	if (mode == adapter->dcbx_cap)
		return 0;

	adapter->dcbx_cap = mode;

	/* ETS and PFC defaults */
	ets.ets_cap = 8;
	pfc.pfc_cap = 8;

	if (mode & DCB_CAP_DCBX_VER_IEEE) {
		ixgbe_dcbnl_ieee_setets(dev, &ets);
		ixgbe_dcbnl_ieee_setpfc(dev, &pfc);
	} else if (mode & DCB_CAP_DCBX_VER_CEE) {
		u8 mask = BIT_PFC | BIT_PG_TX | BIT_PG_RX | BIT_APP_UPCHG;

		adapter->dcb_set_bitmap |= mask;
		ixgbe_dcbnl_set_all(dev);
	} else {
		/* Drop into single TC mode strict priority as this
		 * indicates CEE and IEEE versions are disabled
		 */
		ixgbe_dcbnl_ieee_setets(dev, &ets);
		ixgbe_dcbnl_ieee_setpfc(dev, &pfc);
		err = ixgbe_setup_tc(dev, 0);
	}

	return err ? 1 : 0;
}

const struct dcbnl_rtnl_ops ixgbe_dcbnl_ops = {
	.ieee_getets	= ixgbe_dcbnl_ieee_getets,
	.ieee_setets	= ixgbe_dcbnl_ieee_setets,
	.ieee_getpfc	= ixgbe_dcbnl_ieee_getpfc,
	.ieee_setpfc	= ixgbe_dcbnl_ieee_setpfc,
	.ieee_setapp	= ixgbe_dcbnl_ieee_setapp,
	.ieee_delapp	= ixgbe_dcbnl_ieee_delapp,
	.getstate	= ixgbe_dcbnl_get_state,
	.setstate	= ixgbe_dcbnl_set_state,
	.getpermhwaddr	= ixgbe_dcbnl_get_perm_hw_addr,
	.setpgtccfgtx	= ixgbe_dcbnl_set_pg_tc_cfg_tx,
	.setpgbwgcfgtx	= ixgbe_dcbnl_set_pg_bwg_cfg_tx,
	.setpgtccfgrx	= ixgbe_dcbnl_set_pg_tc_cfg_rx,
	.setpgbwgcfgrx	= ixgbe_dcbnl_set_pg_bwg_cfg_rx,
	.getpgtccfgtx	= ixgbe_dcbnl_get_pg_tc_cfg_tx,
	.getpgbwgcfgtx	= ixgbe_dcbnl_get_pg_bwg_cfg_tx,
	.getpgtccfgrx	= ixgbe_dcbnl_get_pg_tc_cfg_rx,
	.getpgbwgcfgrx	= ixgbe_dcbnl_get_pg_bwg_cfg_rx,
	.setpfccfg	= ixgbe_dcbnl_set_pfc_cfg,
	.getpfccfg	= ixgbe_dcbnl_get_pfc_cfg,
	.setall		= ixgbe_dcbnl_set_all,
	.getcap		= ixgbe_dcbnl_getcap,
	.getnumtcs	= ixgbe_dcbnl_getnumtcs,
	.setnumtcs	= ixgbe_dcbnl_setnumtcs,
	.getpfcstate	= ixgbe_dcbnl_getpfcstate,
	.setpfcstate	= ixgbe_dcbnl_setpfcstate,
	.getapp		= ixgbe_dcbnl_getapp,
	.getdcbx	= ixgbe_dcbnl_getdcbx,
	.setdcbx	= ixgbe_dcbnl_setdcbx,
};