path: root/net/dcb/dcbnl.c

/*
 * Copyright (c) 2008, 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., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Author: Lucy Liu <lucy.liu@intel.com>
 */

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

MODULE_AUTHOR("Lucy Liu, <lucy.liu@intel.com>");
MODULE_DESCRIPTION("Data Center Bridging netlink interface");
MODULE_LICENSE("GPL");

/**************** DCB attribute policies *************************************/

/* DCB netlink attributes policy */
static 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 priority flow control to User Priority nested attributes */
static 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 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},