/*

   * Copyright (c) 2008-2011, 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, see <http://www.gnu.org/licenses/>.

   *

   * Description: Data Center Bridging netlink interface

   * Author: Lucy Liu <lucy.liu@intel.com>
   */
  
  #include <linux/netdevice.h>
  #include <linux/netlink.h>

  #include <linux/slab.h>

  #include <net/netlink.h>
  #include <net/rtnetlink.h>
  #include <linux/dcbnl.h>

  #include <net/dcbevent.h>

  #include <linux/rtnetlink.h>

  #include <linux/init.h>

  #include <net/sock.h>

  /* Data Center Bridging (DCB) is a collection of Ethernet enhancements

   * intended to allow network traffic with differing requirements
   * (highly reliable, no drops vs. best effort vs. low latency) to operate
   * and co-exist on Ethernet.  Current DCB features are:
   *
   * Enhanced Transmission Selection (aka Priority Grouping [PG]) - provides a
   *   framework for assigning bandwidth guarantees to traffic classes.
   *
   * Priority-based Flow Control (PFC) - provides a flow control mechanism which
   *   can work independently for each 802.1p priority.
   *
   * Congestion Notification - provides a mechanism for end-to-end congestion
   *   control for protocols which do not have built-in congestion management.
   *
   * More information about the emerging standards for these Ethernet features
   * can be found at: http://www.ieee802.org/1/pages/dcbridges.html
   *
   * This file implements an rtnetlink interface to allow configuration of DCB
   * features for capable devices.
   */

  /**************** DCB attribute policies *************************************/
  
  /* DCB netlink attributes policy */

  static const struct nla_policy dcbnl_rtnl_policy[DCB_ATTR_MAX + 1] = {

  	[DCB_ATTR_IFNAME]      = {.type = NLA_NUL_STRING, .len = IFNAMSIZ - 1},
  	[DCB_ATTR_STATE]       = {.type = NLA_U8},
  	[DCB_ATTR_PFC_CFG]     = {.type = NLA_NESTED},
  	[DCB_ATTR_PG_CFG]      = {.type = NLA_NESTED},
  	[DCB_ATTR_SET_ALL]     = {.type = NLA_U8},

  	[DCB_ATTR_PERM_HWADDR] = {.type = NLA_FLAG},

  	[DCB_ATTR_CAP]         = {.type = NLA_NESTED},
  	[DCB_ATTR_PFC_STATE]   = {.type = NLA_U8},
  	[DCB_ATTR_BCN]         = {.type = NLA_NESTED},

  	[DCB_ATTR_APP]         = {.type = NLA_NESTED},

  	[DCB_ATTR_IEEE]	       = {.type = NLA_NESTED},

  	[DCB_ATTR_DCBX]        = {.type = NLA_U8},

  	[DCB_ATTR_FEATCFG]     = {.type = NLA_NESTED},

  };
  
  /* DCB priority flow control to User Priority nested attributes */

  static const struct nla_policy dcbnl_pfc_up_nest[DCB_PFC_UP_ATTR_MAX + 1] = {

  	[DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},
  	[DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},
  };
  
  /* DCB priority grouping nested attributes */

  static const struct nla_policy dcbnl_pg_nest[DCB_PG_ATTR_MAX + 1] = {

  	[DCB_PG_ATTR_TC_0]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_1]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_2]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_3]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_4]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_5]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_6]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_7]      = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_TC_ALL]    = {.type = NLA_NESTED},
  	[DCB_PG_ATTR_BW_ID_0]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_1]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_2]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_3]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_4]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_5]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_6]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_7]   = {.type = NLA_U8},
  	[DCB_PG_ATTR_BW_ID_ALL] = {.type = NLA_FLAG},
  };
  
  /* DCB traffic class nested attributes. */

  static const struct nla_policy dcbnl_tc_param_nest[DCB_TC_ATTR_PARAM_MAX + 1] = {

  	[DCB_TC_ATTR_PARAM_PGID]            = {.type = NLA_U8},
  	[DCB_TC_ATTR_PARAM_UP_MAPPING]      = {.type = NLA_U8},
  	[DCB_TC_ATTR_PARAM_STRICT_PRIO]     = {.type = NLA_U8},
  	[DCB_TC_ATTR_PARAM_BW_PCT]          = {.type = NLA_U8},
  	[DCB_TC_ATTR_PARAM_ALL]             = {.type = NLA_FLAG},
  };

  /* DCB capabilities nested attributes. */

  static const struct nla_policy dcbnl_cap_nest[DCB_CAP_ATTR_MAX + 1] = {

  	[DCB_CAP_ATTR_ALL]     = {.type = NLA_FLAG},
  	[DCB_CAP_ATTR_PG]      = {.type = NLA_U8},
  	[DCB_CAP_ATTR_PFC]     = {.type = NLA_U8},
  	[DCB_CAP_ATTR_UP2TC]   = {.type = NLA_U8},
  	[DCB_CAP_ATTR_PG_TCS]  = {.type = NLA_U8},
  	[DCB_CAP_ATTR_PFC_TCS] = {.type = NLA_U8},
  	[DCB_CAP_ATTR_GSP]     = {.type = NLA_U8},
  	[DCB_CAP_ATTR_BCN]     = {.type = NLA_U8},

  	[DCB_CAP_ATTR_DCBX]    = {.type = NLA_U8},

  };

  /* DCB capabilities nested attributes. */

  static const struct nla_policy dcbnl_numtcs_nest[DCB_NUMTCS_ATTR_MAX + 1] = {

  	[DCB_NUMTCS_ATTR_ALL]     = {.type = NLA_FLAG},
  	[DCB_NUMTCS_ATTR_PG]      = {.type = NLA_U8},
  	[DCB_NUMTCS_ATTR_PFC]     = {.type = NLA_U8},
  };

  /* DCB BCN nested attributes. */

  static const struct nla_policy dcbnl_bcn_nest[DCB_BCN_ATTR_MAX + 1] = {

  	[DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},
  	[DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},

  	[DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},
  	[DCB_BCN_ATTR_BCNA_1]       = {.type = NLA_U32},

  	[DCB_BCN_ATTR_ALPHA]        = {.type = NLA_U32},
  	[DCB_BCN_ATTR_BETA]         = {.type = NLA_U32},
  	[DCB_BCN_ATTR_GD]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_GI]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_TMAX]         = {.type = NLA_U32},
  	[DCB_BCN_ATTR_TD]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_RMIN]         = {.type = NLA_U32},
  	[DCB_BCN_ATTR_W]            = {.type = NLA_U32},
  	[DCB_BCN_ATTR_RD]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_RU]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_WRTT]         = {.type = NLA_U32},
  	[DCB_BCN_ATTR_RI]           = {.type = NLA_U32},
  	[DCB_BCN_ATTR_C]            = {.type = NLA_U32},
  	[DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},
  };

  /* DCB APP nested attributes. */

  static const struct nla_policy dcbnl_app_nest[DCB_APP_ATTR_MAX + 1] = {

  	[DCB_APP_ATTR_IDTYPE]       = {.type = NLA_U8},
  	[DCB_APP_ATTR_ID]           = {.type = NLA_U16},
  	[DCB_APP_ATTR_PRIORITY]     = {.type = NLA_U8},
  };

  /* IEEE 802.1Qaz nested attributes. */
  static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = {
  	[DCB_ATTR_IEEE_ETS]	    = {.len = sizeof(struct ieee_ets)},
  	[DCB_ATTR_IEEE_PFC]	    = {.len = sizeof(struct ieee_pfc)},
  	[DCB_ATTR_IEEE_APP_TABLE]   = {.type = NLA_NESTED},

  	[DCB_ATTR_IEEE_MAXRATE]   = {.len = sizeof(struct ieee_maxrate)},

  	[DCB_ATTR_IEEE_QCN]         = {.len = sizeof(struct ieee_qcn)},
  	[DCB_ATTR_IEEE_QCN_STATS]   = {.len = sizeof(struct ieee_qcn_stats)},

  };
  
  static const struct nla_policy dcbnl_ieee_app[DCB_ATTR_IEEE_APP_MAX + 1] = {
  	[DCB_ATTR_IEEE_APP]	    = {.len = sizeof(struct dcb_app)},
  };

  /* DCB number of traffic classes nested attributes. */
  static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
  	[DCB_FEATCFG_ATTR_ALL]      = {.type = NLA_FLAG},
  	[DCB_FEATCFG_ATTR_PG]       = {.type = NLA_U8},
  	[DCB_FEATCFG_ATTR_PFC]      = {.type = NLA_U8},
  	[DCB_FEATCFG_ATTR_APP]      = {.type = NLA_U8},
  };

  static LIST_HEAD(dcb_app_list);
  static DEFINE_SPINLOCK(dcb_lock);

  static struct sk_buff *dcbnl_newmsg(int type, u8 cmd, u32 port, u32 seq,
  				    u32 flags, struct nlmsghdr **nlhp)
  {
  	struct sk_buff *skb;
  	struct dcbmsg *dcb;
  	struct nlmsghdr *nlh;
  
  	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
  	if (!skb)
  		return NULL;
  
  	nlh = nlmsg_put(skb, port, seq, type, sizeof(*dcb), flags);

  	BUG_ON(!nlh);

  
  	dcb = nlmsg_data(nlh);
  	dcb->dcb_family = AF_UNSPEC;
  	dcb->cmd = cmd;
  	dcb->dcb_pad = 0;
  
  	if (nlhp)
  		*nlhp = nlh;
  
  	return skb;
  }

  static int dcbnl_getstate(struct net_device *netdev, struct nlmsghdr *nlh,
  			  u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	/* if (!tb[DCB_ATTR_STATE] || !netdev->dcbnl_ops->getstate) */
  	if (!netdev->dcbnl_ops->getstate)

  		return -EOPNOTSUPP;

  	return nla_put_u8(skb, DCB_ATTR_STATE,
  			  netdev->dcbnl_ops->getstate(netdev));

  }

  static int dcbnl_getpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			   u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1], *nest;
  	u8 value;

  	int ret;

  	int i;
  	int getall = 0;

  	if (!tb[DCB_ATTR_PFC_CFG])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->getpfccfg)
  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
  	                       tb[DCB_ATTR_PFC_CFG],
  	                       dcbnl_pfc_up_nest);
  	if (ret)

  		return ret;

  	nest = nla_nest_start(skb, DCB_ATTR_PFC_CFG);

  	if (!nest)

  		return -EMSGSIZE;

  
  	if (data[DCB_PFC_UP_ATTR_ALL])
  		getall = 1;
  
  	for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
  		if (!getall && !data[i])
  			continue;
  
  		netdev->dcbnl_ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0,
  		                             &value);

  		ret = nla_put_u8(skb, i, value);

  		if (ret) {

  			nla_nest_cancel(skb, nest);

  			return ret;

  		}
  	}

  	nla_nest_end(skb, nest);

  
  	return 0;

  }

  static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlmsghdr *nlh,
  				u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	u8 perm_addr[MAX_ADDR_LEN];

  
  	if (!netdev->dcbnl_ops->getpermhwaddr)

  		return -EOPNOTSUPP;

  	memset(perm_addr, 0, sizeof(perm_addr));

  	netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);

  	return nla_put(skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr), perm_addr);

  }

  static int dcbnl_getcap(struct net_device *netdev, struct nlmsghdr *nlh,
  			u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *data[DCB_CAP_ATTR_MAX + 1], *nest;
  	u8 value;

  	int ret;

  	int i;
  	int getall = 0;

  	if (!tb[DCB_ATTR_CAP])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->getcap)
  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_CAP_ATTR_MAX, tb[DCB_ATTR_CAP],
  	                       dcbnl_cap_nest);
  	if (ret)

  		return ret;

  	nest = nla_nest_start(skb, DCB_ATTR_CAP);

  	if (!nest)

  		return -EMSGSIZE;

  
  	if (data[DCB_CAP_ATTR_ALL])
  		getall = 1;
  
  	for (i = DCB_CAP_ATTR_ALL+1; i <= DCB_CAP_ATTR_MAX; i++) {
  		if (!getall && !data[i])
  			continue;
  
  		if (!netdev->dcbnl_ops->getcap(netdev, i, &value)) {

  			ret = nla_put_u8(skb, i, value);

  			if (ret) {

  				nla_nest_cancel(skb, nest);

  				return ret;

  			}
  		}
  	}

  	nla_nest_end(skb, nest);

  
  	return 0;

  }

  static int dcbnl_getnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
  			   u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1], *nest;
  	u8 value;

  	int ret;

  	int i;
  	int getall = 0;

  	if (!tb[DCB_ATTR_NUMTCS])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->getnumtcs)
  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
  	                       dcbnl_numtcs_nest);

  	if (ret)
  		return ret;

  	nest = nla_nest_start(skb, DCB_ATTR_NUMTCS);

  	if (!nest)
  		return -EMSGSIZE;

  
  	if (data[DCB_NUMTCS_ATTR_ALL])
  		getall = 1;
  
  	for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
  		if (!getall && !data[i])
  			continue;
  
  		ret = netdev->dcbnl_ops->getnumtcs(netdev, i, &value);
  		if (!ret) {

  			ret = nla_put_u8(skb, i, value);

  			if (ret) {

  				nla_nest_cancel(skb, nest);

  				return ret;

  			}

  		} else
  			return -EINVAL;

  	}

  	nla_nest_end(skb, nest);

  
  	return 0;

  }

  static int dcbnl_setnumtcs(struct net_device *netdev, struct nlmsghdr *nlh,
  			   u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	struct nlattr *data[DCB_NUMTCS_ATTR_MAX + 1];

  	int ret;

  	u8 value;
  	int i;

  	if (!tb[DCB_ATTR_NUMTCS])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->setnumtcs)
  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_NUMTCS_ATTR_MAX, tb[DCB_ATTR_NUMTCS],
  	                       dcbnl_numtcs_nest);

  	if (ret)

  		return ret;

  
  	for (i = DCB_NUMTCS_ATTR_ALL+1; i <= DCB_NUMTCS_ATTR_MAX; i++) {
  		if (data[i] == NULL)
  			continue;
  
  		value = nla_get_u8(data[i]);
  
  		ret = netdev->dcbnl_ops->setnumtcs(netdev, i, value);

  		if (ret)

  			break;

  	}

  	return nla_put_u8(skb, DCB_ATTR_NUMTCS, !!ret);

  }

  static int dcbnl_getpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	if (!netdev->dcbnl_ops->getpfcstate)

  		return -EOPNOTSUPP;

  	return nla_put_u8(skb, DCB_ATTR_PFC_STATE,
  			  netdev->dcbnl_ops->getpfcstate(netdev));

  }

  static int dcbnl_setpfcstate(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	u8 value;

  	if (!tb[DCB_ATTR_PFC_STATE])

  		return -EINVAL;

  	if (!netdev->dcbnl_ops->setpfcstate)
  		return -EOPNOTSUPP;

  	value = nla_get_u8(tb[DCB_ATTR_PFC_STATE]);
  
  	netdev->dcbnl_ops->setpfcstate(netdev, value);

  	return nla_put_u8(skb, DCB_ATTR_PFC_STATE, 0);

  }

  static int dcbnl_getapp(struct net_device *netdev, struct nlmsghdr *nlh,
  			u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *app_nest;
  	struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];
  	u16 id;
  	u8 up, idtype;

  	int ret;

  	if (!tb[DCB_ATTR_APP])

  		return -EINVAL;

  
  	ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
  	                       dcbnl_app_nest);
  	if (ret)

  		return ret;

  	/* all must be non-null */
  	if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
  	    (!app_tb[DCB_APP_ATTR_ID]))

  		return -EINVAL;

  
  	/* either by eth type or by socket number */
  	idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
  	if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
  	    (idtype != DCB_APP_IDTYPE_PORTNUM))

  		return -EINVAL;

  
  	id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);

  
  	if (netdev->dcbnl_ops->getapp) {

  		ret = netdev->dcbnl_ops->getapp(netdev, idtype, id);
  		if (ret < 0)
  			return ret;
  		else
  			up = ret;

  	} else {
  		struct dcb_app app = {
  					.selector = idtype,
  					.protocol = id,
  				     };
  		up = dcb_getapp(netdev, &app);
  	}

  	app_nest = nla_nest_start(skb, DCB_ATTR_APP);

  	if (!app_nest)

  		return -EMSGSIZE;

  	ret = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE, idtype);

  	if (ret)
  		goto out_cancel;

  	ret = nla_put_u16(skb, DCB_APP_ATTR_ID, id);

  	if (ret)
  		goto out_cancel;

  	ret = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY, up);

  	if (ret)
  		goto out_cancel;

  	nla_nest_end(skb, app_nest);

  	return 0;

  
  out_cancel:

  	nla_nest_cancel(skb, app_nest);

  	return ret;
  }

  static int dcbnl_setapp(struct net_device *netdev, struct nlmsghdr *nlh,
  			u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	int ret;

  	u16 id;
  	u8 up, idtype;
  	struct nlattr *app_tb[DCB_APP_ATTR_MAX + 1];

  	if (!tb[DCB_ATTR_APP])

  		return -EINVAL;

  
  	ret = nla_parse_nested(app_tb, DCB_APP_ATTR_MAX, tb[DCB_ATTR_APP],
  	                       dcbnl_app_nest);
  	if (ret)

  		return ret;

  	/* all must be non-null */
  	if ((!app_tb[DCB_APP_ATTR_IDTYPE]) ||
  	    (!app_tb[DCB_APP_ATTR_ID]) ||
  	    (!app_tb[DCB_APP_ATTR_PRIORITY]))

  		return -EINVAL;

  
  	/* either by eth type or by socket number */
  	idtype = nla_get_u8(app_tb[DCB_APP_ATTR_IDTYPE]);
  	if ((idtype != DCB_APP_IDTYPE_ETHTYPE) &&
  	    (idtype != DCB_APP_IDTYPE_PORTNUM))

  		return -EINVAL;

  
  	id = nla_get_u16(app_tb[DCB_APP_ATTR_ID]);
  	up = nla_get_u8(app_tb[DCB_APP_ATTR_PRIORITY]);

  	if (netdev->dcbnl_ops->setapp) {

  		ret = netdev->dcbnl_ops->setapp(netdev, idtype, id, up);

  		if (ret < 0)
  			return ret;

  	} else {
  		struct dcb_app app;
  		app.selector = idtype;
  		app.protocol = id;
  		app.priority = up;

  		ret = dcb_setapp(netdev, &app);

  	}

  	ret = nla_put_u8(skb, DCB_ATTR_APP, ret);

  	dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SAPP, seq, 0);

  	return ret;
  }

  static int __dcbnl_pg_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     struct nlattr **tb, struct sk_buff *skb, int dir)

  {

  	struct nlattr *pg_nest, *param_nest, *data;
  	struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
  	struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];
  	u8 prio, pgid, tc_pct, up_map;

  	int ret;

  	int getall = 0;
  	int i;

  	if (!tb[DCB_ATTR_PG_CFG])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->getpgtccfgtx ||

  	    !netdev->dcbnl_ops->getpgtccfgrx ||
  	    !netdev->dcbnl_ops->getpgbwgcfgtx ||
  	    !netdev->dcbnl_ops->getpgbwgcfgrx)

  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
  	                       tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);

  	if (ret)

  		return ret;

  	pg_nest = nla_nest_start(skb, DCB_ATTR_PG_CFG);

  	if (!pg_nest)

  		return -EMSGSIZE;

  
  	if (pg_tb[DCB_PG_ATTR_TC_ALL])
  		getall = 1;
  
  	for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
  		if (!getall && !pg_tb[i])
  			continue;
  
  		if (pg_tb[DCB_PG_ATTR_TC_ALL])
  			data = pg_tb[DCB_PG_ATTR_TC_ALL];
  		else
  			data = pg_tb[i];
  		ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
  				       data, dcbnl_tc_param_nest);
  		if (ret)
  			goto err_pg;

  		param_nest = nla_nest_start(skb, i);

  		if (!param_nest)
  			goto err_pg;
  
  		pgid = DCB_ATTR_VALUE_UNDEFINED;
  		prio = DCB_ATTR_VALUE_UNDEFINED;
  		tc_pct = DCB_ATTR_VALUE_UNDEFINED;
  		up_map = DCB_ATTR_VALUE_UNDEFINED;
  
  		if (dir) {
  			/* Rx */
  			netdev->dcbnl_ops->getpgtccfgrx(netdev,
  						i - DCB_PG_ATTR_TC_0, &prio,
  						&pgid, &tc_pct, &up_map);
  		} else {
  			/* Tx */
  			netdev->dcbnl_ops->getpgtccfgtx(netdev,
  						i - DCB_PG_ATTR_TC_0, &prio,
  						&pgid, &tc_pct, &up_map);
  		}
  
  		if (param_tb[DCB_TC_ATTR_PARAM_PGID] ||
  		    param_tb[DCB_TC_ATTR_PARAM_ALL]) {

  			ret = nla_put_u8(skb,

  			                 DCB_TC_ATTR_PARAM_PGID, pgid);
  			if (ret)
  				goto err_param;
  		}
  		if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING] ||
  		    param_tb[DCB_TC_ATTR_PARAM_ALL]) {

  			ret = nla_put_u8(skb,

  			                 DCB_TC_ATTR_PARAM_UP_MAPPING, up_map);
  			if (ret)
  				goto err_param;
  		}
  		if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO] ||
  		    param_tb[DCB_TC_ATTR_PARAM_ALL]) {

  			ret = nla_put_u8(skb,

  			                 DCB_TC_ATTR_PARAM_STRICT_PRIO, prio);
  			if (ret)
  				goto err_param;
  		}
  		if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT] ||
  		    param_tb[DCB_TC_ATTR_PARAM_ALL]) {

  			ret = nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT,

  			                 tc_pct);
  			if (ret)
  				goto err_param;
  		}

  		nla_nest_end(skb, param_nest);

  	}
  
  	if (pg_tb[DCB_PG_ATTR_BW_ID_ALL])
  		getall = 1;
  	else
  		getall = 0;
  
  	for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
  		if (!getall && !pg_tb[i])
  			continue;
  
  		tc_pct = DCB_ATTR_VALUE_UNDEFINED;
  
  		if (dir) {
  			/* Rx */
  			netdev->dcbnl_ops->getpgbwgcfgrx(netdev,
  					i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
  		} else {
  			/* Tx */
  			netdev->dcbnl_ops->getpgbwgcfgtx(netdev,
  					i - DCB_PG_ATTR_BW_ID_0, &tc_pct);
  		}

  		ret = nla_put_u8(skb, i, tc_pct);

  		if (ret)
  			goto err_pg;
  	}

  	nla_nest_end(skb, pg_nest);

  
  	return 0;
  
  err_param:

  	nla_nest_cancel(skb, param_nest);

  err_pg:

  	nla_nest_cancel(skb, pg_nest);

  
  	return -EMSGSIZE;

  }

  static int dcbnl_pgtx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 0);

  }

  static int dcbnl_pgrx_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	return __dcbnl_pg_getcfg(netdev, nlh, tb, skb, 1);

  }

  static int dcbnl_setstate(struct net_device *netdev, struct nlmsghdr *nlh,
  			  u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	u8 value;

  	if (!tb[DCB_ATTR_STATE])

  		return -EINVAL;

  	if (!netdev->dcbnl_ops->setstate)
  		return -EOPNOTSUPP;

  	value = nla_get_u8(tb[DCB_ATTR_STATE]);

  	return nla_put_u8(skb, DCB_ATTR_STATE,
  			  netdev->dcbnl_ops->setstate(netdev, value));

  }

  static int dcbnl_setpfccfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			   u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	struct nlattr *data[DCB_PFC_UP_ATTR_MAX + 1];
  	int i;

  	int ret;

  	u8 value;

  	if (!tb[DCB_ATTR_PFC_CFG])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->setpfccfg)
  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_PFC_UP_ATTR_MAX,
  	                       tb[DCB_ATTR_PFC_CFG],
  	                       dcbnl_pfc_up_nest);
  	if (ret)

  		return ret;

  
  	for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
  		if (data[i] == NULL)
  			continue;
  		value = nla_get_u8(data[i]);
  		netdev->dcbnl_ops->setpfccfg(netdev,
  			data[i]->nla_type - DCB_PFC_UP_ATTR_0, value);
  	}

  	return nla_put_u8(skb, DCB_ATTR_PFC_CFG, 0);

  }

  static int dcbnl_setall(struct net_device *netdev, struct nlmsghdr *nlh,
  			u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	int ret;

  	if (!tb[DCB_ATTR_SET_ALL])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->setall)
  		return -EOPNOTSUPP;

  	ret = nla_put_u8(skb, DCB_ATTR_SET_ALL,
  			 netdev->dcbnl_ops->setall(netdev));

  	dcbnl_cee_notify(netdev, RTM_SETDCB, DCB_CMD_SET_ALL, seq, 0);

  
  	return ret;
  }

  static int __dcbnl_pg_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb,
  			     int dir)

  {
  	struct nlattr *pg_tb[DCB_PG_ATTR_MAX + 1];
  	struct nlattr *param_tb[DCB_TC_ATTR_PARAM_MAX + 1];

  	int ret;

  	int i;
  	u8 pgid;
  	u8 up_map;
  	u8 prio;
  	u8 tc_pct;

  	if (!tb[DCB_ATTR_PG_CFG])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->setpgtccfgtx ||

  	    !netdev->dcbnl_ops->setpgtccfgrx ||
  	    !netdev->dcbnl_ops->setpgbwgcfgtx ||
  	    !netdev->dcbnl_ops->setpgbwgcfgrx)

  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(pg_tb, DCB_PG_ATTR_MAX,
  	                       tb[DCB_ATTR_PG_CFG], dcbnl_pg_nest);
  	if (ret)

  		return ret;

  
  	for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
  		if (!pg_tb[i])
  			continue;
  
  		ret = nla_parse_nested(param_tb, DCB_TC_ATTR_PARAM_MAX,
  		                       pg_tb[i], dcbnl_tc_param_nest);
  		if (ret)

  			return ret;

  
  		pgid = DCB_ATTR_VALUE_UNDEFINED;
  		prio = DCB_ATTR_VALUE_UNDEFINED;
  		tc_pct = DCB_ATTR_VALUE_UNDEFINED;
  		up_map = DCB_ATTR_VALUE_UNDEFINED;
  
  		if (param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO])
  			prio =
  			    nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_STRICT_PRIO]);
  
  		if (param_tb[DCB_TC_ATTR_PARAM_PGID])
  			pgid = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_PGID]);
  
  		if (param_tb[DCB_TC_ATTR_PARAM_BW_PCT])
  			tc_pct = nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_BW_PCT]);
  
  		if (param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING])
  			up_map =
  			     nla_get_u8(param_tb[DCB_TC_ATTR_PARAM_UP_MAPPING]);
  
  		/* dir: Tx = 0, Rx = 1 */
  		if (dir) {
  			/* Rx */
  			netdev->dcbnl_ops->setpgtccfgrx(netdev,
  				i - DCB_PG_ATTR_TC_0,
  				prio, pgid, tc_pct, up_map);
  		} else {
  			/* Tx */
  			netdev->dcbnl_ops->setpgtccfgtx(netdev,
  				i - DCB_PG_ATTR_TC_0,
  				prio, pgid, tc_pct, up_map);
  		}
  	}
  
  	for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
  		if (!pg_tb[i])
  			continue;
  
  		tc_pct = nla_get_u8(pg_tb[i]);
  
  		/* dir: Tx = 0, Rx = 1 */
  		if (dir) {
  			/* Rx */
  			netdev->dcbnl_ops->setpgbwgcfgrx(netdev,
  					 i - DCB_PG_ATTR_BW_ID_0, tc_pct);
  		} else {
  			/* Tx */
  			netdev->dcbnl_ops->setpgbwgcfgtx(netdev,
  					 i - DCB_PG_ATTR_BW_ID_0, tc_pct);
  		}
  	}

  	return nla_put_u8(skb, DCB_ATTR_PG_CFG, 0);

  }

  static int dcbnl_pgtx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 0);

  }

  static int dcbnl_pgrx_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			     u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	return __dcbnl_pg_setcfg(netdev, nlh, seq, tb, skb, 1);

  }

  static int dcbnl_bcn_getcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			    u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *bcn_nest;
  	struct nlattr *bcn_tb[DCB_BCN_ATTR_MAX + 1];
  	u8 value_byte;
  	u32 value_integer;

  	int ret;

  	bool getall = false;
  	int i;

  	if (!tb[DCB_ATTR_BCN])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->getbcnrp ||

  	    !netdev->dcbnl_ops->getbcncfg)

  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(bcn_tb, DCB_BCN_ATTR_MAX,
  	                       tb[DCB_ATTR_BCN], dcbnl_bcn_nest);

  	if (ret)

  		return ret;

  	bcn_nest = nla_nest_start(skb, DCB_ATTR_BCN);

  	if (!bcn_nest)

  		return -EMSGSIZE;

  
  	if (bcn_tb[DCB_BCN_ATTR_ALL])
  		getall = true;
  
  	for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
  		if (!getall && !bcn_tb[i])
  			continue;
  
  		netdev->dcbnl_ops->getbcnrp(netdev, i - DCB_BCN_ATTR_RP_0,
  		                            &value_byte);

  		ret = nla_put_u8(skb, i, value_byte);

  		if (ret)
  			goto err_bcn;
  	}

  	for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {

  		if (!getall && !bcn_tb[i])
  			continue;
  
  		netdev->dcbnl_ops->getbcncfg(netdev, i,
  		                             &value_integer);

  		ret = nla_put_u32(skb, i, value_integer);

  		if (ret)
  			goto err_bcn;
  	}

  	nla_nest_end(skb, bcn_nest);

  
  	return 0;
  
  err_bcn:

  	nla_nest_cancel(skb, bcn_nest);

  	return ret;
  }

  static int dcbnl_bcn_setcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			    u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	struct nlattr *data[DCB_BCN_ATTR_MAX + 1];
  	int i;

  	int ret;

  	u8 value_byte;
  	u32 value_int;

  	if (!tb[DCB_ATTR_BCN])
  		return -EINVAL;
  
  	if (!netdev->dcbnl_ops->setbcncfg ||

  	    !netdev->dcbnl_ops->setbcnrp)

  		return -EOPNOTSUPP;

  
  	ret = nla_parse_nested(data, DCB_BCN_ATTR_MAX,
  	                       tb[DCB_ATTR_BCN],
  	                       dcbnl_pfc_up_nest);
  	if (ret)

  		return ret;

  
  	for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) {
  		if (data[i] == NULL)
  			continue;
  		value_byte = nla_get_u8(data[i]);
  		netdev->dcbnl_ops->setbcnrp(netdev,
  			data[i]->nla_type - DCB_BCN_ATTR_RP_0, value_byte);
  	}

  	for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) {

  		if (data[i] == NULL)
  			continue;
  		value_int = nla_get_u32(data[i]);
  		netdev->dcbnl_ops->setbcncfg(netdev,
  	                                     i, value_int);
  	}

  	return nla_put_u8(skb, DCB_ATTR_BCN, 0);

  }

  static int dcbnl_build_peer_app(struct net_device *netdev, struct sk_buff* skb,
  				int app_nested_type, int app_info_type,
  				int app_entry_type)

  {
  	struct dcb_peer_app_info info;
  	struct dcb_app *table = NULL;
  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
  	u16 app_count;
  	int err;
  
  
  	/**
  	 * retrieve the peer app configuration form the driver. If the driver
  	 * handlers fail exit without doing anything
  	 */
  	err = ops->peer_getappinfo(netdev, &info, &app_count);
  	if (!err && app_count) {
  		table = kmalloc(sizeof(struct dcb_app) * app_count, GFP_KERNEL);
  		if (!table)
  			return -ENOMEM;
  
  		err = ops->peer_getapptable(netdev, table);
  	}
  
  	if (!err) {
  		u16 i;
  		struct nlattr *app;
  
  		/**
  		 * build the message, from here on the only possible failure
  		 * is due to the skb size
  		 */
  		err = -EMSGSIZE;

  		app = nla_nest_start(skb, app_nested_type);

  		if (!app)
  			goto nla_put_failure;

  		if (app_info_type &&
  		    nla_put(skb, app_info_type, sizeof(info), &info))
  			goto nla_put_failure;

  		for (i = 0; i < app_count; i++) {
  			if (nla_put(skb, app_entry_type, sizeof(struct dcb_app),
  				    &table[i]))
  				goto nla_put_failure;
  		}

  		nla_nest_end(skb, app);
  	}
  	err = 0;
  
  nla_put_failure:
  	kfree(table);
  	return err;
  }

  /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb GET commands. */

  static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)

  {

  	struct nlattr *ieee, *app;
  	struct dcb_app_type *itr;

  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;

  	int dcbx;

  	int err;

  	if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))

  		return -EMSGSIZE;

  	ieee = nla_nest_start(skb, DCB_ATTR_IEEE);
  	if (!ieee)

  		return -EMSGSIZE;

  
  	if (ops->ieee_getets) {
  		struct ieee_ets ets;

  		memset(&ets, 0, sizeof(ets));

  		err = ops->ieee_getets(netdev, &ets);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets))

  			return -EMSGSIZE;

  	}

  	if (ops->ieee_getmaxrate) {
  		struct ieee_maxrate maxrate;

  		memset(&maxrate, 0, sizeof(maxrate));

  		err = ops->ieee_getmaxrate(netdev, &maxrate);
  		if (!err) {
  			err = nla_put(skb, DCB_ATTR_IEEE_MAXRATE,
  				      sizeof(maxrate), &maxrate);
  			if (err)

  				return -EMSGSIZE;

  		}
  	}

  	if (ops->ieee_getqcn) {
  		struct ieee_qcn qcn;
  
  		memset(&qcn, 0, sizeof(qcn));
  		err = ops->ieee_getqcn(netdev, &qcn);
  		if (!err) {
  			err = nla_put(skb, DCB_ATTR_IEEE_QCN,
  				      sizeof(qcn), &qcn);
  			if (err)
  				return -EMSGSIZE;
  		}
  	}
  
  	if (ops->ieee_getqcnstats) {
  		struct ieee_qcn_stats qcn_stats;
  
  		memset(&qcn_stats, 0, sizeof(qcn_stats));
  		err = ops->ieee_getqcnstats(netdev, &qcn_stats);
  		if (!err) {
  			err = nla_put(skb, DCB_ATTR_IEEE_QCN_STATS,
  				      sizeof(qcn_stats), &qcn_stats);
  			if (err)
  				return -EMSGSIZE;
  		}
  	}

  	if (ops->ieee_getpfc) {
  		struct ieee_pfc pfc;

  		memset(&pfc, 0, sizeof(pfc));

  		err = ops->ieee_getpfc(netdev, &pfc);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc))

  			return -EMSGSIZE;

  	}

  	app = nla_nest_start(skb, DCB_ATTR_IEEE_APP_TABLE);
  	if (!app)

  		return -EMSGSIZE;

  	spin_lock_bh(&dcb_lock);

  	list_for_each_entry(itr, &dcb_app_list, list) {

  		if (itr->ifindex == netdev->ifindex) {

  			err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
  					 &itr->app);
  			if (err) {

  				spin_unlock_bh(&dcb_lock);

  				return -EMSGSIZE;

  			}
  		}

  	}

  
  	if (netdev->dcbnl_ops->getdcbx)
  		dcbx = netdev->dcbnl_ops->getdcbx(netdev);
  	else
  		dcbx = -EOPNOTSUPP;

  	spin_unlock_bh(&dcb_lock);

  	nla_nest_end(skb, app);

  	/* get peer info if available */
  	if (ops->ieee_peer_getets) {
  		struct ieee_ets ets;

  		memset(&ets, 0, sizeof(ets));

  		err = ops->ieee_peer_getets(netdev, &ets);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_IEEE_PEER_ETS, sizeof(ets), &ets))

  			return -EMSGSIZE;

  	}
  
  	if (ops->ieee_peer_getpfc) {
  		struct ieee_pfc pfc;

  		memset(&pfc, 0, sizeof(pfc));

  		err = ops->ieee_peer_getpfc(netdev, &pfc);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_IEEE_PEER_PFC, sizeof(pfc), &pfc))

  			return -EMSGSIZE;

  	}
  
  	if (ops->peer_getappinfo && ops->peer_getapptable) {

  		err = dcbnl_build_peer_app(netdev, skb,
  					   DCB_ATTR_IEEE_PEER_APP,
  					   DCB_ATTR_IEEE_APP_UNSPEC,
  					   DCB_ATTR_IEEE_APP);

  		if (err)

  			return -EMSGSIZE;

  	}

  	nla_nest_end(skb, ieee);

  	if (dcbx >= 0) {
  		err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
  		if (err)

  			return -EMSGSIZE;

  	}

  	return 0;

  }

  static int dcbnl_cee_pg_fill(struct sk_buff *skb, struct net_device *dev,
  			     int dir)
  {
  	u8 pgid, up_map, prio, tc_pct;
  	const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
  	int i = dir ? DCB_ATTR_CEE_TX_PG : DCB_ATTR_CEE_RX_PG;
  	struct nlattr *pg = nla_nest_start(skb, i);
  
  	if (!pg)

  		return -EMSGSIZE;

  
  	for (i = DCB_PG_ATTR_TC_0; i <= DCB_PG_ATTR_TC_7; i++) {
  		struct nlattr *tc_nest = nla_nest_start(skb, i);
  
  		if (!tc_nest)

  			return -EMSGSIZE;

  
  		pgid = DCB_ATTR_VALUE_UNDEFINED;
  		prio = DCB_ATTR_VALUE_UNDEFINED;
  		tc_pct = DCB_ATTR_VALUE_UNDEFINED;
  		up_map = DCB_ATTR_VALUE_UNDEFINED;
  
  		if (!dir)
  			ops->getpgtccfgrx(dev, i - DCB_PG_ATTR_TC_0,
  					  &prio, &pgid, &tc_pct, &up_map);
  		else
  			ops->getpgtccfgtx(dev, i - DCB_PG_ATTR_TC_0,
  					  &prio, &pgid, &tc_pct, &up_map);

  		if (nla_put_u8(skb, DCB_TC_ATTR_PARAM_PGID, pgid) ||
  		    nla_put_u8(skb, DCB_TC_ATTR_PARAM_UP_MAPPING, up_map) ||
  		    nla_put_u8(skb, DCB_TC_ATTR_PARAM_STRICT_PRIO, prio) ||
  		    nla_put_u8(skb, DCB_TC_ATTR_PARAM_BW_PCT, tc_pct))

  			return -EMSGSIZE;

  		nla_nest_end(skb, tc_nest);
  	}
  
  	for (i = DCB_PG_ATTR_BW_ID_0; i <= DCB_PG_ATTR_BW_ID_7; i++) {
  		tc_pct = DCB_ATTR_VALUE_UNDEFINED;
  
  		if (!dir)
  			ops->getpgbwgcfgrx(dev, i - DCB_PG_ATTR_BW_ID_0,
  					   &tc_pct);
  		else
  			ops->getpgbwgcfgtx(dev, i - DCB_PG_ATTR_BW_ID_0,
  					   &tc_pct);

  		if (nla_put_u8(skb, i, tc_pct))

  			return -EMSGSIZE;

  	}
  	nla_nest_end(skb, pg);
  	return 0;

  }
  
  static int dcbnl_cee_fill(struct sk_buff *skb, struct net_device *netdev)
  {
  	struct nlattr *cee, *app;
  	struct dcb_app_type *itr;
  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
  	int dcbx, i, err = -EMSGSIZE;
  	u8 value;

  	if (nla_put_string(skb, DCB_ATTR_IFNAME, netdev->name))
  		goto nla_put_failure;

  	cee = nla_nest_start(skb, DCB_ATTR_CEE);
  	if (!cee)
  		goto nla_put_failure;
  
  	/* local pg */
  	if (ops->getpgtccfgtx && ops->getpgbwgcfgtx) {
  		err = dcbnl_cee_pg_fill(skb, netdev, 1);
  		if (err)
  			goto nla_put_failure;
  	}
  
  	if (ops->getpgtccfgrx && ops->getpgbwgcfgrx) {
  		err = dcbnl_cee_pg_fill(skb, netdev, 0);
  		if (err)
  			goto nla_put_failure;
  	}
  
  	/* local pfc */
  	if (ops->getpfccfg) {
  		struct nlattr *pfc_nest = nla_nest_start(skb, DCB_ATTR_CEE_PFC);
  
  		if (!pfc_nest)
  			goto nla_put_failure;
  
  		for (i = DCB_PFC_UP_ATTR_0; i <= DCB_PFC_UP_ATTR_7; i++) {
  			ops->getpfccfg(netdev, i - DCB_PFC_UP_ATTR_0, &value);

  			if (nla_put_u8(skb, i, value))
  				goto nla_put_failure;

  		}
  		nla_nest_end(skb, pfc_nest);
  	}
  
  	/* local app */

  	spin_lock_bh(&dcb_lock);

  	app = nla_nest_start(skb, DCB_ATTR_CEE_APP_TABLE);
  	if (!app)

  		goto dcb_unlock;

  
  	list_for_each_entry(itr, &dcb_app_list, list) {

  		if (itr->ifindex == netdev->ifindex) {

  			struct nlattr *app_nest = nla_nest_start(skb,
  								 DCB_ATTR_APP);
  			if (!app_nest)
  				goto dcb_unlock;
  
  			err = nla_put_u8(skb, DCB_APP_ATTR_IDTYPE,
  					 itr->app.selector);
  			if (err)
  				goto dcb_unlock;
  
  			err = nla_put_u16(skb, DCB_APP_ATTR_ID,
  					  itr->app.protocol);
  			if (err)
  				goto dcb_unlock;
  
  			err = nla_put_u8(skb, DCB_APP_ATTR_PRIORITY,
  					 itr->app.priority);
  			if (err)
  				goto dcb_unlock;
  
  			nla_nest_end(skb, app_nest);
  		}
  	}
  	nla_nest_end(skb, app);
  
  	if (netdev->dcbnl_ops->getdcbx)
  		dcbx = netdev->dcbnl_ops->getdcbx(netdev);
  	else
  		dcbx = -EOPNOTSUPP;

  	spin_unlock_bh(&dcb_lock);

  
  	/* features flags */
  	if (ops->getfeatcfg) {
  		struct nlattr *feat = nla_nest_start(skb, DCB_ATTR_CEE_FEAT);
  		if (!feat)
  			goto nla_put_failure;
  
  		for (i = DCB_FEATCFG_ATTR_ALL + 1; i <= DCB_FEATCFG_ATTR_MAX;
  		     i++)

  			if (!ops->getfeatcfg(netdev, i, &value) &&
  			    nla_put_u8(skb, i, value))
  				goto nla_put_failure;

  
  		nla_nest_end(skb, feat);
  	}
  
  	/* peer info if available */
  	if (ops->cee_peer_getpg) {
  		struct cee_pg pg;

  		memset(&pg, 0, sizeof(pg));

  		err = ops->cee_peer_getpg(netdev, &pg);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_CEE_PEER_PG, sizeof(pg), &pg))
  			goto nla_put_failure;

  	}
  
  	if (ops->cee_peer_getpfc) {
  		struct cee_pfc pfc;

  		memset(&pfc, 0, sizeof(pfc));

  		err = ops->cee_peer_getpfc(netdev, &pfc);

  		if (!err &&
  		    nla_put(skb, DCB_ATTR_CEE_PEER_PFC, sizeof(pfc), &pfc))
  			goto nla_put_failure;

  	}
  
  	if (ops->peer_getappinfo && ops->peer_getapptable) {
  		err = dcbnl_build_peer_app(netdev, skb,
  					   DCB_ATTR_CEE_PEER_APP_TABLE,
  					   DCB_ATTR_CEE_PEER_APP_INFO,
  					   DCB_ATTR_CEE_PEER_APP);
  		if (err)
  			goto nla_put_failure;
  	}
  	nla_nest_end(skb, cee);
  
  	/* DCBX state */
  	if (dcbx >= 0) {
  		err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
  		if (err)
  			goto nla_put_failure;
  	}
  	return 0;
  
  dcb_unlock:

  	spin_unlock_bh(&dcb_lock);

  nla_put_failure:

  	err = -EMSGSIZE;

  	return err;
  }
  
  static int dcbnl_notify(struct net_device *dev, int event, int cmd,

  			u32 seq, u32 portid, int dcbx_ver)

  {
  	struct net *net = dev_net(dev);
  	struct sk_buff *skb;
  	struct nlmsghdr *nlh;

  	const struct dcbnl_rtnl_ops *ops = dev->dcbnl_ops;
  	int err;
  
  	if (!ops)
  		return -EOPNOTSUPP;

  	skb = dcbnl_newmsg(event, cmd, portid, seq, 0, &nlh);

  	if (!skb)
  		return -ENOBUFS;

  	if (dcbx_ver == DCB_CAP_DCBX_VER_IEEE)
  		err = dcbnl_ieee_fill(skb, dev);
  	else
  		err = dcbnl_cee_fill(skb, dev);

  	if (err < 0) {
  		/* Report error to broadcast listeners */

  		nlmsg_free(skb);

  		rtnl_set_sk_err(net, RTNLGRP_DCB, err);
  	} else {
  		/* End nlmsg and notify broadcast listeners */
  		nlmsg_end(skb, nlh);
  		rtnl_notify(skb, net, 0, RTNLGRP_DCB, NULL, GFP_KERNEL);
  	}
  
  	return err;
  }

  
  int dcbnl_ieee_notify(struct net_device *dev, int event, int cmd,

  		      u32 seq, u32 portid)

  {

  	return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_IEEE);

  }
  EXPORT_SYMBOL(dcbnl_ieee_notify);
  
  int dcbnl_cee_notify(struct net_device *dev, int event, int cmd,

  		     u32 seq, u32 portid)

  {

  	return dcbnl_notify(dev, event, cmd, seq, portid, DCB_CAP_DCBX_VER_CEE);

  }
  EXPORT_SYMBOL(dcbnl_cee_notify);

  /* Handle IEEE 802.1Qaz/802.1Qau/802.1Qbb SET commands.
   * If any requested operation can not be completed
   * the entire msg is aborted and error value is returned.

   * No attempt is made to reconcile the case where only part of the
   * cmd can be completed.
   */

  static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
  			  u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
  	struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];

  	int err;

  
  	if (!ops)

  		return -EOPNOTSUPP;

  	if (!tb[DCB_ATTR_IEEE])
  		return -EINVAL;

  	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
  			       tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
  	if (err)
  		return err;
  
  	if (ieee[DCB_ATTR_IEEE_ETS] && ops->ieee_setets) {
  		struct ieee_ets *ets = nla_data(ieee[DCB_ATTR_IEEE_ETS]);
  		err = ops->ieee_setets(netdev, ets);
  		if (err)
  			goto err;
  	}

  	if (ieee[DCB_ATTR_IEEE_MAXRATE] && ops->ieee_setmaxrate) {
  		struct ieee_maxrate *maxrate =
  			nla_data(ieee[DCB_ATTR_IEEE_MAXRATE]);
  		err = ops->ieee_setmaxrate(netdev, maxrate);
  		if (err)
  			goto err;
  	}

  	if (ieee[DCB_ATTR_IEEE_QCN] && ops->ieee_setqcn) {
  		struct ieee_qcn *qcn =
  			nla_data(ieee[DCB_ATTR_IEEE_QCN]);
  
  		err = ops->ieee_setqcn(netdev, qcn);
  		if (err)
  			goto err;
  	}

  	if (ieee[DCB_ATTR_IEEE_PFC] && ops->ieee_setpfc) {
  		struct ieee_pfc *pfc = nla_data(ieee[DCB_ATTR_IEEE_PFC]);
  		err = ops->ieee_setpfc(netdev, pfc);
  		if (err)
  			goto err;
  	}
  
  	if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
  		struct nlattr *attr;
  		int rem;
  
  		nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
  			struct dcb_app *app_data;
  			if (nla_type(attr) != DCB_ATTR_IEEE_APP)
  				continue;
  			app_data = nla_data(attr);
  			if (ops->ieee_setapp)
  				err = ops->ieee_setapp(netdev, app_data);
  			else

  				err = dcb_ieee_setapp(netdev, app_data);

  			if (err)
  				goto err;
  		}
  	}
  
  err:

  	err = nla_put_u8(skb, DCB_ATTR_IEEE, err);

  	dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_SET, seq, 0);

  	return err;
  }

  static int dcbnl_ieee_get(struct net_device *netdev, struct nlmsghdr *nlh,
  			  u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;

  
  	if (!ops)
  		return -EOPNOTSUPP;

  	return dcbnl_ieee_fill(skb, netdev);

  }

  static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
  			  u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
  	struct nlattr *ieee[DCB_ATTR_IEEE_MAX + 1];

  	int err;

  
  	if (!ops)
  		return -EOPNOTSUPP;
  
  	if (!tb[DCB_ATTR_IEEE])
  		return -EINVAL;
  
  	err = nla_parse_nested(ieee, DCB_ATTR_IEEE_MAX,
  			       tb[DCB_ATTR_IEEE], dcbnl_ieee_policy);
  	if (err)
  		return err;
  
  	if (ieee[DCB_ATTR_IEEE_APP_TABLE]) {
  		struct nlattr *attr;
  		int rem;
  
  		nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
  			struct dcb_app *app_data;
  
  			if (nla_type(attr) != DCB_ATTR_IEEE_APP)
  				continue;
  			app_data = nla_data(attr);
  			if (ops->ieee_delapp)
  				err = ops->ieee_delapp(netdev, app_data);
  			else
  				err = dcb_ieee_delapp(netdev, app_data);
  			if (err)
  				goto err;
  		}
  	}
  
  err:

  	err = nla_put_u8(skb, DCB_ATTR_IEEE, err);

  	dcbnl_ieee_notify(netdev, RTM_SETDCB, DCB_CMD_IEEE_DEL, seq, 0);

  	return err;
  }

  /* DCBX configuration */

  static int dcbnl_getdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
  			 u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	if (!netdev->dcbnl_ops->getdcbx)

  		return -EOPNOTSUPP;

  	return nla_put_u8(skb, DCB_ATTR_DCBX,
  			  netdev->dcbnl_ops->getdcbx(netdev));

  }

  static int dcbnl_setdcbx(struct net_device *netdev, struct nlmsghdr *nlh,
  			 u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	u8 value;

  	if (!netdev->dcbnl_ops->setdcbx)
  		return -EOPNOTSUPP;
  
  	if (!tb[DCB_ATTR_DCBX])
  		return -EINVAL;

  
  	value = nla_get_u8(tb[DCB_ATTR_DCBX]);

  	return nla_put_u8(skb, DCB_ATTR_DCBX,
  			  netdev->dcbnl_ops->setdcbx(netdev, value));

  }

  static int dcbnl_getfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			    u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1], *nest;
  	u8 value;

  	int ret, i;

  	int getall = 0;

  	if (!netdev->dcbnl_ops->getfeatcfg)
  		return -EOPNOTSUPP;
  
  	if (!tb[DCB_ATTR_FEATCFG])
  		return -EINVAL;

  
  	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
  			       dcbnl_featcfg_nest);

  	if (ret)

  		return ret;

  	nest = nla_nest_start(skb, DCB_ATTR_FEATCFG);
  	if (!nest)
  		return -EMSGSIZE;

  
  	if (data[DCB_FEATCFG_ATTR_ALL])
  		getall = 1;
  
  	for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
  		if (!getall && !data[i])
  			continue;
  
  		ret = netdev->dcbnl_ops->getfeatcfg(netdev, i, &value);

  		if (!ret)

  			ret = nla_put_u8(skb, i, value);

  		if (ret) {

  			nla_nest_cancel(skb, nest);

  			goto nla_put_failure;
  		}

  	}

  	nla_nest_end(skb, nest);

  nla_put_failure:

  	return ret;
  }

  static int dcbnl_setfeatcfg(struct net_device *netdev, struct nlmsghdr *nlh,
  			    u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {
  	struct nlattr *data[DCB_FEATCFG_ATTR_MAX + 1];

  	int ret, i;

  	u8 value;

  	if (!netdev->dcbnl_ops->setfeatcfg)
  		return -ENOTSUPP;
  
  	if (!tb[DCB_ATTR_FEATCFG])
  		return -EINVAL;

  
  	ret = nla_parse_nested(data, DCB_FEATCFG_ATTR_MAX, tb[DCB_ATTR_FEATCFG],
  			       dcbnl_featcfg_nest);

  	if (ret)

  		goto err;

  
  	for (i = DCB_FEATCFG_ATTR_ALL+1; i <= DCB_FEATCFG_ATTR_MAX; i++) {
  		if (data[i] == NULL)
  			continue;
  
  		value = nla_get_u8(data[i]);
  
  		ret = netdev->dcbnl_ops->setfeatcfg(netdev, i, value);
  
  		if (ret)

  			goto err;

  	}

  err:

  	ret = nla_put_u8(skb, DCB_ATTR_FEATCFG, ret);

  	return ret;
  }

  /* Handle CEE DCBX GET commands. */

  static int dcbnl_cee_get(struct net_device *netdev, struct nlmsghdr *nlh,
  			 u32 seq, struct nlattr **tb, struct sk_buff *skb)

  {

  	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;

  
  	if (!ops)
  		return -EOPNOTSUPP;

  	return dcbnl_cee_fill(skb, netdev);

  }

  struct reply_func {
  	/* reply netlink message type */
  	int	type;
  
  	/* function to fill message contents */
  	int   (*cb)(struct net_device *, struct nlmsghdr *, u32,
  		    struct nlattr **, struct sk_buff *);
  };
  
  static const struct reply_func reply_funcs[DCB_CMD_MAX+1] = {

  	[DCB_CMD_GSTATE]	= { RTM_GETDCB, dcbnl_getstate },
  	[DCB_CMD_SSTATE]	= { RTM_SETDCB, dcbnl_setstate },
  	[DCB_CMD_PFC_GCFG]	= { RTM_GETDCB, dcbnl_getpfccfg },
  	[DCB_CMD_PFC_SCFG]	= { RTM_SETDCB, dcbnl_setpfccfg },
  	[DCB_CMD_GPERM_HWADDR]	= { RTM_GETDCB, dcbnl_getperm_hwaddr },
  	[DCB_CMD_GCAP]		= { RTM_GETDCB, dcbnl_getcap },
  	[DCB_CMD_GNUMTCS]	= { RTM_GETDCB, dcbnl_getnumtcs },
  	[DCB_CMD_SNUMTCS]	= { RTM_SETDCB, dcbnl_setnumtcs },
  	[DCB_CMD_PFC_GSTATE]	= { RTM_GETDCB, dcbnl_getpfcstate },
  	[DCB_CMD_PFC_SSTATE]	= { RTM_SETDCB, dcbnl_setpfcstate },
  	[DCB_CMD_GAPP]		= { RTM_GETDCB, dcbnl_getapp },
  	[DCB_CMD_SAPP]		= { RTM_SETDCB, dcbnl_setapp },
  	[DCB_CMD_PGTX_GCFG]	= { RTM_GETDCB, dcbnl_pgtx_getcfg },
  	[DCB_CMD_PGTX_SCFG]	= { RTM_SETDCB, dcbnl_pgtx_setcfg },
  	[DCB_CMD_PGRX_GCFG]	= { RTM_GETDCB, dcbnl_pgrx_getcfg },
  	[DCB_CMD_PGRX_SCFG]	= { RTM_SETDCB, dcbnl_pgrx_setcfg },
  	[DCB_CMD_SET_ALL]	= { RTM_SETDCB, dcbnl_setall },
  	[DCB_CMD_BCN_GCFG]	= { RTM_GETDCB, dcbnl_bcn_getcfg },
  	[DCB_CMD_BCN_SCFG]	= { RTM_SETDCB, dcbnl_bcn_setcfg },
  	[DCB_CMD_IEEE_GET]	= { RTM_GETDCB, dcbnl_ieee_get },
  	[DCB_CMD_IEEE_SET]	= { RTM_SETDCB, dcbnl_ieee_set },
  	[DCB_CMD_IEEE_DEL]	= { RTM_SETDCB, dcbnl_ieee_del },
  	[DCB_CMD_GDCBX]		= { RTM_GETDCB, dcbnl_getdcbx },
  	[DCB_CMD_SDCBX]		= { RTM_SETDCB, dcbnl_setdcbx },
  	[DCB_CMD_GFEATCFG]	= { RTM_GETDCB, dcbnl_getfeatcfg },
  	[DCB_CMD_SFEATCFG]	= { RTM_SETDCB, dcbnl_setfeatcfg },
  	[DCB_CMD_CEE_GET]	= { RTM_GETDCB, dcbnl_cee_get },

  };

  static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)

  {
  	struct net *net = sock_net(skb->sk);
  	struct net_device *netdev;

  	struct dcbmsg *dcb = nlmsg_data(nlh);

  	struct nlattr *tb[DCB_ATTR_MAX + 1];

  	u32 portid = skb ? NETLINK_CB(skb).portid : 0;

  	int ret = -EINVAL;

  	struct sk_buff *reply_skb;

  	struct nlmsghdr *reply_nlh = NULL;

  	const struct reply_func *fn;

  	if ((nlh->nlmsg_type == RTM_SETDCB) && !netlink_capable(skb, CAP_NET_ADMIN))

  		return -EPERM;

  	ret = nlmsg_parse(nlh, sizeof(*dcb), tb, DCB_ATTR_MAX,
  			  dcbnl_rtnl_policy);
  	if (ret < 0)
  		return ret;

  	if (dcb->cmd > DCB_CMD_MAX)
  		return -EINVAL;
  
  	/* check if a reply function has been defined for the command */
  	fn = &reply_funcs[dcb->cmd];
  	if (!fn->cb)
  		return -EOPNOTSUPP;

  	if (!tb[DCB_ATTR_IFNAME])
  		return -EINVAL;

  	netdev = __dev_get_by_name(net, nla_data(tb[DCB_ATTR_IFNAME]));

  	if (!netdev)

  		return -ENODEV;

  	if (!netdev->dcbnl_ops)
  		return -EOPNOTSUPP;

  	reply_skb = dcbnl_newmsg(fn->type, dcb->cmd, portid, nlh->nlmsg_seq,

  				 nlh->nlmsg_flags, &reply_nlh);

  	if (!reply_skb)
  		return -ENOBUFS;

  
  	ret = fn->cb(netdev, nlh, nlh->nlmsg_seq, tb, reply_skb);
  	if (ret < 0) {
  		nlmsg_free(reply_skb);
  		goto out;
  	}
  
  	nlmsg_end(reply_skb, reply_nlh);

  	ret = rtnl_unicast(reply_skb, net, portid);

  out:

  	return ret;
  }

  static struct dcb_app_type *dcb_app_lookup(const struct dcb_app *app,
  					   int ifindex, int prio)
  {
  	struct dcb_app_type *itr;
  
  	list_for_each_entry(itr, &dcb_app_list, list) {
  		if (itr->app.selector == app->selector &&
  		    itr->app.protocol == app->protocol &&
  		    itr->ifindex == ifindex &&
  		    (!prio || itr->app.priority == prio))
  			return itr;
  	}
  
  	return NULL;
  }

  static int dcb_app_add(const struct dcb_app *app, int ifindex)
  {
  	struct dcb_app_type *entry;
  
  	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
  	if (!entry)
  		return -ENOMEM;
  
  	memcpy(&entry->app, app, sizeof(*app));
  	entry->ifindex = ifindex;
  	list_add(&entry->list, &dcb_app_list);
  
  	return 0;
  }

  /**
   * dcb_getapp - retrieve the DCBX application user priority
   *
   * On success returns a non-zero 802.1p user priority bitmap
   * otherwise returns 0 as the invalid user priority bitmap to
   * indicate an error.
   */
  u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
  {
  	struct dcb_app_type *itr;
  	u8 prio = 0;

  	spin_lock_bh(&dcb_lock);

  	if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
  		prio = itr->app.priority;

  	spin_unlock_bh(&dcb_lock);

  
  	return prio;
  }
  EXPORT_SYMBOL(dcb_getapp);
  
  /**

   * dcb_setapp - add CEE dcb application data to app list

   *

   * Priority 0 is an invalid priority in CEE spec. This routine
   * removes applications from the app list if the priority is

   * set to zero. Priority is expected to be 8-bit 802.1p user priority bitmap

   */

  int dcb_setapp(struct net_device *dev, struct dcb_app *new)

  {
  	struct dcb_app_type *itr;

  	struct dcb_app_type event;

  	int err = 0;

  	event.ifindex = dev->ifindex;

  	memcpy(&event.app, new, sizeof(event.app));

  	if (dev->dcbnl_ops->getdcbx)
  		event.dcbx = dev->dcbnl_ops->getdcbx(dev);

  	spin_lock_bh(&dcb_lock);

  	/* Search for existing match and replace */

  	if ((itr = dcb_app_lookup(new, dev->ifindex, 0))) {
  		if (new->priority)
  			itr->app.priority = new->priority;
  		else {
  			list_del(&itr->list);
  			kfree(itr);

  		}

  		goto out;

  	}
  	/* App type does not exist add new application type */

  	if (new->priority)
  		err = dcb_app_add(new, dev->ifindex);

  out:

  	spin_unlock_bh(&dcb_lock);

  	if (!err)
  		call_dcbevent_notifiers(DCB_APP_EVENT, &event);
  	return err;

  }
  EXPORT_SYMBOL(dcb_setapp);

  /**

   * dcb_ieee_getapp_mask - retrieve the IEEE DCB application priority
   *
   * Helper routine which on success returns a non-zero 802.1Qaz user
   * priority bitmap otherwise returns 0 to indicate the dcb_app was
   * not found in APP list.
   */
  u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
  {
  	struct dcb_app_type *itr;
  	u8 prio = 0;

  	spin_lock_bh(&dcb_lock);

  	if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
  		prio |= 1 << itr->app.priority;

  	spin_unlock_bh(&dcb_lock);

  
  	return prio;
  }
  EXPORT_SYMBOL(dcb_ieee_getapp_mask);
  
  /**

   * dcb_ieee_setapp - add IEEE dcb application data to app list
   *
   * This adds Application data to the list. Multiple application
   * entries may exists for the same selector and protocol as long

   * as the priorities are different. Priority is expected to be a
   * 3-bit unsigned integer

   */
  int dcb_ieee_setapp(struct net_device *dev, struct dcb_app *new)
  {

  	struct dcb_app_type event;
  	int err = 0;

  	event.ifindex = dev->ifindex;