Release 4.11 net/dcb/dcbnl.c

/*
 * 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;
}

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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));
}

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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;
}

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214
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3
100.00%



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);
}

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Alexander Duyck
53
60.92%
1
25.00%
Thomas Graf
22
25.29%
2
50.00%
Mathias Krause
12
13.79%
1
25.00%
Total
87
100.00%
4
100.00%



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;
}

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2
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100.00%



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;
}

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35
15.35%
2
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100.00%



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);
}

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2
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Donald Skidmore
1
0.60%
1
20.00%
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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));
}

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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);
}

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25
28.09%
2
66.67%
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89
100.00%
3
100.00%



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;
}

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11.43%
2
33.33%
Anish Bhatt
15
4.76%
1
16.67%
Jesper Juhl
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1.59%
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16.67%
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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]