lldp_dcbx.c

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

  LLDP Agent Daemon (LLDPAD) Software
  Copyright(c) 2007-2010 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:
  open-lldp Mailing List <lldp-devel@open-lldp.org>

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

#include <stdlib.h>
#include <assert.h>
#include <sys/socket.h>
#include "linux/if.h"
#include "include/linux/dcbnl.h"
#include "lldp.h"
#include "lldp/ports.h"
#include "lldp/states.h"
#include "dcb_types.h"
#include "lldp_dcbx.h"
#include "dcb_protocol.h"
#include "tlv_dcbx.h"
#include "messages.h"
#include "lldpad.h"
#include "libconfig.h"
#include "config.h"
#include "lldpad_status.h"
#include "lldp_mod.h"
#include "lldp_mand_clif.h"
#include "lldp_dcbx_nl.h"
#include "lldp_dcbx_cfg.h"
#include "lldp_dcbx_cmds.h"
#include "lldp_8021qaz.h"
#include "lldp_rtnl.h"
#include "lldp_tlv.h"
#include "lldp_rtnl.h"
#include "lldpad_shm.h"
#include "dcb_driver_interface.h"

extern u8 gdcbx_subtype;

void dcbx_free_tlv(struct dcbx_tlvs *tlvs);
static int dcbx_check_operstate(struct port *port, struct lldp_agent *agent);

const struct lldp_mod_ops dcbx_ops = {
	.lldp_mod_register	= dcbx_register,
	.lldp_mod_unregister	= dcbx_unregister,
	.lldp_mod_gettlv	= dcbx_gettlv,
	.lldp_mod_rchange	= dcbx_rchange,
	.lldp_mod_ifup		= dcbx_ifup,
	.lldp_mod_ifdown	= dcbx_ifdown,
	.lldp_mod_mibdelete	= dcbx_mibDeleteObjects,
	.client_cmd		= dcbx_clif_cmd,
	.get_arg_handler	= dcbx_get_arg_handlers,
	.timer			= dcbx_check_operstate,
};

static int dcbx_check_operstate(struct port *port, struct lldp_agent *agent)
{
	int err;
	u8 app_good = 0;
	u8 pfc_good = 0;
	app_attribs app_data;
	pfc_attribs pfc_data;
	struct dcbx_tlvs *tlvs;

	if (agent->type != NEAREST_BRIDGE)
		return 0;

	if (!port->portEnabled || !port->dormantDelay)
		return 0;

	tlvs = dcbx_data(port->ifname);
	if (!tlvs || tlvs->operup)
		return 0;

	err = get_app(port->ifname, 0, &app_data);
	if (err)
		goto err_out;
	err = get_pfc(port->ifname, &pfc_data);
	if (err)
		goto err_out;

	if ((pfc_data.protocol.Enable && pfc_data.protocol.OperMode) ||
	    !pfc_data.protocol.Enable)
		pfc_good = 1;
	if ((app_data.protocol.Enable && app_data.protocol.OperMode) ||
	    !app_data.protocol.Enable)
		app_good = 1;

	if ((pfc_good && app_good) || port->dormantDelay == 1) {
		LLDPAD_DBG("%s: %s: IF_OPER_UP delay, %u pfc oper %u"
			   "app oper %u\n",
			__func__, port->ifname, port->dormantDelay,
			pfc_data.protocol.OperMode,
			app_data.protocol.OperMode);
		tlvs->operup = true;
		if (get_operstate(port->ifname) != IF_OPER_UP)
			set_operstate(port->ifname, IF_OPER_UP);
		else
			set_hw_all(port->ifname);
	}

	return 0;

err_out:
	set_operstate(port->ifname, IF_OPER_UP);
	return -1;
}

struct dcbx_tlvs *dcbx_data(const char *ifname)
{
	struct dcbd_user_data *dud;
	struct dcbx_tlvs *tlv = NULL;

	dud = find_module_user_data_by_id(&lldp_head, LLDP_MOD_DCBX);
	if (dud) {
		LIST_FOREACH(tlv, &dud->head, entry) {
			if (!strncmp(tlv->ifname, ifname, IFNAMSIZ))
				return tlv;
		}
	}

	return NULL;
}

int dcbx_tlvs_rxed(const char *ifname, struct lldp_agent *agent)
{
	struct dcbd_user_data *dud;
	struct dcbx_tlvs *tlv = NULL;

	if (agent->type != NEAREST_BRIDGE)
		return 0;

	dud = find_module_user_data_by_id(&lldp_head, LLDP_MOD_DCBX);
	if (dud) {
		LIST_FOREACH(tlv, &dud->head, entry) {
			if (!strncmp(tlv->ifname, ifname, IFNAMSIZ))
				return tlv->rxed_tlvs;
		}
	}

	return 0;
}

int dcbx_get_legacy_version(const char *ifname)
{
	if (lldpad_shm_get_dcbx(ifname))
		return gdcbx_subtype | DCBX_FORCE_BIT;
	else
		return gdcbx_subtype;
}

int dcbx_check_active(const char *ifname)
{
	struct dcbd_user_data *dud;
	struct dcbx_tlvs *tlv = NULL;

	dud = find_module_user_data_by_id(&lldp_head, LLDP_MOD_DCBX);
	if (dud) {
		LIST_FOREACH(tlv, &dud->head, entry) {
			if (!strncmp(tlv->ifname, ifname, IFNAMSIZ))
				return tlv->active;
		}
	}

	return 0;
}

int dcbx_bld_tlv(struct port *newport, struct lldp_agent *agent)
{
	bool success;
	struct dcbx_tlvs *tlvs;
	int enabletx;
	int adminstatus = disabled;

	if (agent->type != NEAREST_BRIDGE)
		return 0;

	tlvs = dcbx_data(newport->ifname);

	get_config_setting(newport->ifname, agent->type, ARG_ADMINSTATUS,
			  &adminstatus, CONFIG_TYPE_INT);

	enabletx = is_tlv_txenabled(newport->ifname, agent->type,
				    (OUI_CEE_DCBX << 8) | tlvs->dcbx_st);

	if (!tlvs->active || !enabletx || adminstatus != enabledRxTx)
		return 0;

	tlvs->control = bld_dcbx_ctrl_tlv(tlvs);
	if (tlvs->control == NULL) {
		LLDPAD_INFO("add_port:  bld_dcbx_ctrl_tlv failed\n");
		goto fail_add;
	}

	if (tlvs->dcbx_st == DCBX_SUBTYPE2) {
		tlvs->pg2 = bld_dcbx2_pg_tlv(tlvs, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx2_pg_tlv: failed\n");
			goto fail_add;
		}
	} else {
		tlvs->pg1 = bld_dcbx1_pg_tlv(tlvs, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx1_pg_tlv: failed\n");
			goto fail_add;
		}
	}

	if (tlvs->dcbx_st == DCBX_SUBTYPE2) {
		tlvs->pfc2 = bld_dcbx2_pfc_tlv(tlvs, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx2_pfc_tlv: failed\n");
			goto fail_add;
		}
	} else {
		tlvs->pfc1 = bld_dcbx1_pfc_tlv(tlvs, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx1_pfc_tlv: failed\n");
			goto fail_add;
		}
	}

	if (tlvs->dcbx_st == DCBX_SUBTYPE2) {
		tlvs->app2 = bld_dcbx2_app_tlv(tlvs, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx2_app_tlv: failed\n");
			goto fail_add;
		}
	} else {
		tlvs->app1 = bld_dcbx1_app_tlv(tlvs, 0, &success);
		if (!success) {
			LLDPAD_INFO("bld_dcbx1_app_tlv: failed\n");
			goto fail_add;
		}
	}

	tlvs->llink = bld_dcbx_llink_tlv(tlvs, LLINK_FCOE_STYPE,
						&success);
	if (!success) {
		LLDPAD_INFO("bld_dcbx_llink_tlv: failed\n");
		goto fail_add;
	}

	if (tlvs->dcbx_st == DCBX_SUBTYPE2) {
		tlvs->dcbx2 = bld_dcbx2_tlv(tlvs);
		if (tlvs->dcbx2 == NULL) {
			LLDPAD_INFO("add_port:  bld_dcbx2_tlv failed\n");
			goto fail_add;
		}
	} else {
		tlvs->dcbx1 = bld_dcbx1_tlv(tlvs);
		if (tlvs->dcbx1 == NULL) {
			LLDPAD_INFO("add_port:  bld_dcbx1_tlv failed\n");
			goto fail_add;
		}
	}
	return 0;
fail_add:
	return -1;
}

void dcbx_free_manifest(struct dcbx_manifest *manifest)
{
	if (!manifest)
		return;

	if (manifest->dcbx1)
		manifest->dcbx1 = free_unpkd_tlv(manifest->dcbx1);
	if (manifest->dcbx2)
		manifest->dcbx2 = free_unpkd_tlv(manifest->dcbx2);
	if (manifest->dcbx_ctrl)
		manifest->dcbx_ctrl = free_unpkd_tlv(manifest->dcbx_ctrl);
	if (manifest->dcbx_pg)
		manifest->dcbx_pg = free_unpkd_tlv(manifest->dcbx_pg);
	if (manifest->dcbx_pfc)
		manifest->dcbx_pfc = free_unpkd_tlv(manifest->dcbx_pfc);
	if (manifest->dcbx_app)
		manifest->dcbx_app = free_unpkd_tlv(manifest->dcbx_app);
	if (manifest->dcbx_llink)
		manifest->dcbx_llink = free_unpkd_tlv(manifest->dcbx_llink);

	return;
}

void dcbx_free_tlv(struct dcbx_tlvs *tlvs)
{
	if (!tlvs)
		return;

	if (tlvs->control != NULL) {
		tlvs->control = free_unpkd_tlv(tlvs->control);
	}

	if (tlvs->pg1 != NULL) {
		tlvs->pg1 = free_unpkd_tlv(tlvs->pg1);
	}

	if (tlvs->pg2 != NULL) {
		tlvs->pg2 = free_unpkd_tlv(tlvs->pg2);
	}

	if (tlvs->pfc1 != NULL) {
		tlvs->pfc1 = free_unpkd_tlv(tlvs->pfc1);
	}

	if (tlvs->pfc2 != NULL) {
		tlvs->pfc2 = free_unpkd_tlv(tlvs->pfc2);
	}

	if (tlvs->app1 != NULL) {
		tlvs->app1 = free_unpkd_tlv(tlvs->app1);
	}

	if (tlvs->app2 != NULL)
		tlvs->app2 = free_unpkd_tlv(tlvs->app2);

	if (tlvs->llink != NULL) {
		tlvs->llink = free_unpkd_tlv(tlvs->llink);
	}

	if (tlvs->dcbx1 != NULL) {
		tlvs->dcbx1 = free_unpkd_tlv(tlvs->dcbx1);
	}

	if (tlvs->dcbx2 != NULL) {
		tlvs->dcbx2 = free_unpkd_tlv(tlvs->dcbx2);
	}
	return;
}

struct packed_tlv* dcbx_gettlv(struct port *port, struct lldp_agent *agent)
{
	struct packed_tlv *ptlv = NULL;
	struct dcbx_tlvs *tlvs;

	if (agent->type != NEAREST_BRIDGE)
		return NULL;

        if (!check_port_dcb_mode(port->ifname))
		return NULL;

	tlvs = dcbx_data(port->ifname);
	if (!tlvs)
		return NULL;

	dcbx_free_tlv(tlvs);

	dcbx_bld_tlv(port, agent);
	if (tlvs->dcbx_st == DCBX_SUBTYPE2) {
		/* Load Type127 - dcbx subtype 2*/
		if (tlv_ok(tlvs->dcbx2))
			ptlv =  pack_tlv(tlvs->dcbx2);
	} else {
		/* Load Type127 - dcbx subtype1 */
		if (tlv_ok(tlvs->dcbx1))
			ptlv =  pack_tlv(tlvs->dcbx1);
	}

	return ptlv;
}

static void dcbx_free_data(struct dcbd_user_data *dud)
{
	struct dcbx_tlvs *dd;
	if (dud) {
		while (!LIST_EMPTY(&dud->head)) {
			dd = LIST_FIRST(&dud->head);
			LIST_REMOVE(dd, entry);
			dcbx_free_tlv(dd);
			dcbx_free_manifest(dd->manifest);
			free(dd->manifest);
			free(dd);
		}
	}
}

struct lldp_module * dcbx_register(void)
{
	struct lldp_module *mod;
	struct dcbd_user_data *dud;
	int dcbx_version;
	int i;

	if (dcbx_default_cfg_file()) {
		LLDPAD_INFO("failed to create default config file\n");
		goto out_err;
	}

	/* Get the DCBX version */
	if (get_dcbx_version(&dcbx_version)) {
		gdcbx_subtype = dcbx_version;
	} else {
		LLDPAD_ERR("failed to get DCBX version");
		goto out_err;
	}

	mod = malloc(sizeof(struct lldp_module));
	if (!mod) {
		LLDPAD_ERR("failed to malloc LLDP DCBX module data\n");
		goto out_err;
	}
	dud = malloc(sizeof(*dud));
	if (!dud) {
		free(mod);
		LLDPAD_ERR("failed to malloc LLDP DCBX module user data\n");
		goto out_err;
	}

	LIST_INIT(&dud->head);
	mod->id = LLDP_MOD_DCBX;
	mod->ops = &dcbx_ops;
	mod->data = dud;

	/* store pg defaults */
	if (!add_pg_defaults()) {
		LLDPAD_INFO("failed to add default PG data");
		goto out_err;
	}

	/* store pg defaults */
	if (!add_pfc_defaults()) {
		LLDPAD_INFO("failed to add default PFC data");
		goto out_err;
	}

	/* store app defaults */
	for (i = 0; i < DCB_MAX_APPTLV; i++) {
		if (!add_app_defaults(i)) {
			LLDPAD_INFO("failed to add default APP data %d", i);
			goto out_err;
		}
	}


	for (i = 0; i < DCB_MAX_LLKTLV; i++) {
		if (!add_llink_defaults(i)) {
			LLDPAD_INFO("failed to add default LLKTLV data %i", i);
			goto out_err;
		}
	}

	if (!init_drv_if()) {
		LLDPAD_WARN("Error creataing netlink socket for driver i/f.\n");
		goto out_err;
	}

	LLDPAD_DBG("%s: dcbx register done\n", __func__);
	return mod;
out_err:
	LLDPAD_DBG("%s: dcbx register failed\n", __func__);
	return NULL;
}

/* BUG: need to check if tlvs are freed */
void dcbx_unregister(struct lldp_module *mod)
{
	dcbx_remove_all();
	deinit_drv_if();
	if (mod->data) {
		dcbx_free_data((struct dcbd_user_data *) mod->data);
		free(mod->data);
	}
	free(mod);
	LLDPAD_DBG("%s: unregister dcbx complete.\n", __func__);
}

void dcbx_ifup(char *ifname, struct lldp_agent *agent)
{
	int ifindex, ret;
	struct port *port;
	struct dcbx_tlvs *tlvs;
	struct dcbd_user_data *dud;
	struct dcbx_manifest *manifest;
	feature_support dcb_support;
	int dcb_enable, exists;
	int adminstatus;
	int enabletx;
	char arg_path[256];

	/* dcb does not support bonded devices */
	if (is_bond(ifname) || is_vlan(ifname))
		return;

	if (agent->type != NEAREST_BRIDGE)
		return;

	ifindex = get_ifidx(ifname);
	port = port_find_by_ifindex(ifindex);

	dud = find_module_user_data_by_id(&lldp_head, LLDP_MOD_DCBX);
	tlvs = dcbx_data(ifname);

	if (!port)
		return;
	if (tlvs)
		goto initialized;

	/* Abort initialization on hardware that does not support
	 * querying the DCB state. We assume this means the driver
	 * does not support DCB.
	 *
	 * dcb_enable falls through and makes CEE active if
	 * it is already enabled AND configuration file does not
	 * have an entry for the dcb_enable field.
	 */
	if (get_hw_state(ifname, &dcb_enable) < 0)
		return;

	/* Abort initialization on hardware  where DCBX negotiation
	 * is not performed by the host LLDP agent.
	 */
	get_dcb_capabilities(ifname, &dcb_support);
	if (dcb_support.dcbx && !(dcb_support.dcbx & DCB_CAP_DCBX_HOST))
		return;

	/* if no adminStatus setting default to enabled for DCBX */
	ret = get_config_setting(ifname, agent->type,
				 ARG_ADMINSTATUS,
				 &adminstatus,
				 CONFIG_TYPE_INT);
	if (ret != cmd_success) {
		/* set enableTx to true if it is not already set */
		snprintf(arg_path, sizeof(arg_path), "%s%08x.%s", TLVID_PREFIX,
			(OUI_CEE_DCBX << 8) | 1, ARG_TLVTXENABLE);
		if (get_config_setting(ifname, agent->type, arg_path,
				       &enabletx, CONFIG_TYPE_BOOL)) {
			enabletx = true;
			set_config_setting(ifname, agent->type, arg_path,
					   &enabletx, CONFIG_TYPE_BOOL);
		}

		snprintf(arg_path, sizeof(arg_path), "%s%08x.%s", TLVID_PREFIX,
			(OUI_CEE_DCBX << 8) | 2, ARG_TLVTXENABLE);
		if (get_config_setting(ifname, agent->type, arg_path,
				       &enabletx, CONFIG_TYPE_BOOL)) {
			enabletx = true;
			set_config_setting(ifname, agent->type, arg_path,
					   &enabletx, CONFIG_TYPE_BOOL);
		}

		adminstatus = enabledRxTx;
		if (set_config_setting(ifname, agent->type, ARG_ADMINSTATUS,
				       &adminstatus, CONFIG_TYPE_INT) ==
				       cmd_success)
			set_lldp_agent_admin(ifname, agent->type, adminstatus);

		/* ensure advertise bits are set consistently with enabletx */
		dont_advertise_dcbx_all(ifname, 1);
	}

	tlvs = malloc(sizeof(*tlvs));
	if (!tlvs) {
		LLDPAD_DBG("%s: ifname %s malloc failed.\n", __func__, ifname);
		return;
	}
	memset(tlvs, 0, sizeof(*tlvs));

	manifest = malloc(sizeof(*manifest));
	if (!manifest) {
		free(tlvs);
		LLDPAD_DBG("%s: %s malloc failure\n", __func__, ifname);
		return;
	}
	memset(manifest, 0, sizeof(*manifest));

	tlvs->manifest = manifest;
	strncpy(tlvs->ifname, ifname, IFNAMSIZ);
	tlvs->port = port;
	tlvs->dcbdu = 0;
	tlvs->dcbx_st = gdcbx_subtype & MASK_DCBX_FORCE;
	LIST_INSERT_HEAD(&dud->head, tlvs, entry);

initialized:
	if (!port->portEnabled || port->dormantDelay)
		tlvs->operup = false;

	dcbx_add_adapter(ifname);

	/* ensure advertise bits are set consistently with enabletx */
	snprintf(arg_path, sizeof(arg_path), "%s%08x.%s", TLVID_PREFIX,
		 (OUI_CEE_DCBX << 8) | tlvs->dcbx_st, ARG_TLVTXENABLE);
	exists = get_config_setting(ifname, agent->type, arg_path,
				    &enabletx, CONFIG_TYPE_BOOL);

	if (exists != cmd_success)
		dont_advertise_dcbx_all(ifname, 1);

	dcbx_bld_tlv(port, agent);

	/* if the dcbx field is not filled in by the capabilities
	 * query, then the kernel is older and does not support
	 * IEEE mode, lacking any specified behavior in the cfg
	 * file DCBX is put in a default mode and will be enabled
	 * if a peer DCBX TLV is received.
	 */
	get_dcb_capabilities(ifname, &dcb_support);
	get_dcb_enable_state(ifname, &dcb_enable);

	if ((dcb_enable != LLDP_DCBX_DISABLED) &&
	    (!dcb_support.dcbx || (gdcbx_subtype & ~MASK_DCBX_FORCE) ||
	    (lldpad_shm_get_dcbx(ifname)))) {
		set_dcbx_mode(tlvs->ifname,
			      DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_CEE);
		set_hw_state(ifname, 1);
		lldpad_shm_set_dcbx(ifname, gdcbx_subtype);
		tlvs->active = true;
	} else {
		tlvs->active = false;
	}

	if (tlvs->active && (get_operstate(ifname) == IF_OPER_UP))
		set_hw_all(ifname);

	return;
}

void dcbx_ifdown(char *device_name, struct lldp_agent *agent)
{
	struct dcbx_tlvs *tlvs;

	if (agent->type != NEAREST_BRIDGE)
		return;

	/* dcb does not support bonded devices */
	if (is_bond(device_name))
		return;

	tlvs = dcbx_data(device_name);
	if (!tlvs)
		return;

	/* remove dcb port */
	if (check_port_dcb_mode(device_name))
		dcbx_remove_adapter(device_name);

	LIST_REMOVE(tlvs, entry);
	dcbx_free_tlv(tlvs);
	dcbx_free_manifest(tlvs->manifest);
	free(tlvs->manifest);
	free(tlvs);
}

void clear_dcbx_manifest(struct dcbx_tlvs *dcbx)
{
	if (!dcbx)
		return;

	if (dcbx->manifest->dcbx_llink)
		dcbx->manifest->dcbx_llink =
			free_unpkd_tlv(dcbx->manifest->dcbx_llink);
	if (dcbx->manifest->dcbx_app)
		dcbx->manifest->dcbx_app =
			free_unpkd_tlv(dcbx->manifest->dcbx_app);
	if (dcbx->manifest->dcbx_pfc)
		dcbx->manifest->dcbx_pfc =
			free_unpkd_tlv(dcbx->manifest->dcbx_pfc);
	if (dcbx->manifest->dcbx_pg)
		dcbx->manifest->dcbx_pg =
			free_unpkd_tlv(dcbx->manifest->dcbx_pg);
	if (dcbx->manifest->dcbx_ctrl)
		dcbx->manifest->dcbx_ctrl =
			free_unpkd_tlv(dcbx->manifest->dcbx_ctrl);
	if (dcbx->manifest->dcbx1)
		dcbx->manifest->dcbx1 =
			free_unpkd_tlv(dcbx->manifest->dcbx1);
	if (dcbx->manifest->dcbx2)
		dcbx->manifest->dcbx2 =
			free_unpkd_tlv(dcbx->manifest->dcbx2);
	free(dcbx->manifest);
	dcbx->manifest = NULL;
}


/*
 * dcbx_rchange: process RX TLV LLDPDU
 *
 * TLV not consumed on error otherwise it is either free'd or stored
 * internally in the module.
 */
int dcbx_rchange(struct port *port, struct lldp_agent *agent, struct unpacked_tlv *tlv)
{
	u8 oui[DCB_OUI_LEN] = INIT_DCB_OUI;
	struct dcbx_tlvs *dcbx;
	struct dcbx_manifest *manifest;
	int res;

	if (agent == NULL || agent->type != NEAREST_BRIDGE)
		return SUBTYPE_INVALID;

	dcbx = dcbx_data(port->ifname);

	if (!dcbx)
		return SUBTYPE_INVALID;

	/*
	 * TYPE_1 is _mandatory_ and will always be before the
	 * DCBX TLV so we can use it to mark the begining of a
	 * pdu for dcbx to verify only a single DCBX TLV is
	 * present
	 */
	if (tlv->type == TYPE_1) {
		manifest = malloc(sizeof(*manifest));
		memset(manifest, 0, sizeof(*manifest));
		dcbx->manifest = manifest;
		dcbx->dcbdu = 0;
		dcbx->rxed_tlvs = false;
	}

	if (tlv->type == TYPE_127) {
		if (tlv->length < (DCB_OUI_LEN + OUI_SUBTYPE_LEN)) {
			return TLV_ERR;
		}

		/* Match DCB OUI */
		if ((memcmp(tlv->info, &oui, DCB_OUI_LEN) != 0))
			return SUBTYPE_INVALID;

		if ((tlv->info[DCB_OUI_LEN] == DCBX_SUBTYPE2)
			&& (agent->lldpdu & RCVD_LLDP_DCBX2_TLV)) {
			LLDPAD_INFO("Received duplicate DCBX2 TLVs\n");
			return TLV_ERR;
		}
		if ((tlv->info[DCB_OUI_LEN] == DCBX_SUBTYPE1)
			&& (agent->lldpdu & RCVD_LLDP_DCBX1_TLV)) {
			LLDPAD_INFO("Received duplicate DCBX1 TLVs\n");
			return TLV_ERR;
		}

		/* Only store a legacy (CIN or CEE) DCBX TLV which matches
		 * the currently configured legacy dcbx mode.
		 * However, capture if any legacy DCBX TLVs are recieved.
		*/
		if (tlv->info[DCB_OUI_LEN] == DCBX_SUBTYPE2) {
			if (dcbx->dcbx_st == DCBX_SUBTYPE2)
				dcbx->manifest->dcbx2 = tlv;
			agent->lldpdu |= RCVD_LLDP_DCBX2_TLV;
			dcbx->rxed_tlvs = true;
			return TLV_OK;
		} else if (tlv->info[DCB_OUI_LEN] == DCBX_SUBTYPE1) {
			if (dcbx->dcbx_st == DCBX_SUBTYPE1)
				dcbx->manifest->dcbx1 = tlv;
			agent->lldpdu |= RCVD_LLDP_DCBX1_TLV;
			dcbx->rxed_tlvs = true;
			return TLV_OK;
		} else {
			return SUBTYPE_INVALID;
		}
	}

	if (tlv->type == TYPE_0) {
		int enabled;
		int not_present = get_dcb_enable_state(dcbx->ifname, &enabled);

		if (!dcbx->active && !ieee8021qaz_tlvs_rxed(dcbx->ifname) &&
		    dcbx->rxed_tlvs && (not_present || enabled)) {
			if (dcbx->dcbx_st == DCBX_SUBTYPE2)
				LLDPAD_DBG("CEE DCBX %s going ACTIVE\n",
					   dcbx->ifname);
			else if (dcbx->dcbx_st == DCBX_SUBTYPE1)
				LLDPAD_DBG("CIN DCBX %s going ACTIVE\n",
					   dcbx->ifname);
			set_dcbx_mode(port->ifname,
				      DCB_CAP_DCBX_HOST | DCB_CAP_DCBX_VER_CEE);
			set_hw_state(port->ifname, 1);
			lldpad_shm_set_dcbx(dcbx->ifname, gdcbx_subtype);
			dcbx->active = true;
			somethingChangedLocal(port->ifname, agent->type);
		}

		if (dcbx->manifest->dcbx2) {
			res = unpack_dcbx2_tlvs(port, agent, dcbx->manifest->dcbx2);
			if (!res) {
				LLDPAD_DBG("Error unpacking the DCBX2"
					"TLVs - Discarding LLDPDU\n");
				return TLV_ERR;
			}
			mibUpdateObjects(port, agent);
		} else if (dcbx->manifest->dcbx1) {
			res = unpack_dcbx1_tlvs(port, agent, dcbx->manifest->dcbx1);
			if (!res) {
				LLDPAD_DBG("Error unpacking the DCBX1"
					"TLVs - Discarding LLDPDU\n");
				return TLV_ERR;
			}
			mibUpdateObjects(port, agent);
		}

		clear_dcbx_manifest(dcbx);
	}

	/* TLV is not handled by DCBx module return invalid to
	 * indicate lldpad core should continue to look for
	 * a module to handle this TLV
	 */
	return SUBTYPE_INVALID;
}

u8 dcbx_mibDeleteObjects(struct port *port, struct lldp_agent *agent)
{
	control_protocol_attribs  peer_control;
	pg_attribs  peer_pg;
	pfc_attribs peer_pfc;
	app_attribs peer_app;
	llink_attribs peer_llink;
	u32 subtype = 0;
	u32 EventFlag = 0;
	int i;

	if (agent->type != NEAREST_BRIDGE)
		return 0;

	/* Set any stored values for this TLV to !Present */
	if (get_peer_pg(port->ifname, &peer_pg) == cmd_success) {
		if (peer_pg.protocol.TLVPresent == true) {
			peer_pg.protocol.TLVPresent = false;
			put_peer_pg(port->ifname, &peer_pg);
			DCB_SET_FLAGS(EventFlag, DCB_REMOTE_CHANGE_PG);
		}
	} else {
		return (u8)-1;
	}

	if (get_peer_pfc(port->ifname, &peer_pfc) == cmd_success) {
		if (peer_pfc.protocol.TLVPresent == true) {
			peer_pfc.protocol.TLVPresent = false;
			put_peer_pfc(port->ifname, &peer_pfc);
			DCB_SET_FLAGS(EventFlag, DCB_REMOTE_CHANGE_PFC);
		}
	} else {
		return (u8)-1;
	}

	for (i = 0; i < DCB_MAX_APPTLV; i++) {
		if (get_peer_app(port->ifname, i, &peer_app) == cmd_success) {
			if (peer_app.protocol.TLVPresent == true) {
				peer_app.protocol.TLVPresent = false;
				peer_app.Length = 0;
				put_peer_app(port->ifname, i, &peer_app);
				DCB_SET_FLAGS(EventFlag, DCB_REMOTE_CHANGE_APPTLV(i));
			}
		}
	}

	if (get_peer_llink(port->ifname, subtype, &peer_llink) == cmd_success) {
		if (peer_llink.protocol.TLVPresent == true) {
			peer_llink.protocol.TLVPresent = false;
			put_peer_llink(port->ifname, subtype, &peer_llink);
			DCB_SET_FLAGS(EventFlag, DCB_REMOTE_CHANGE_LLINK);
		}
	} else {
		return (u8)-1;
	}

	if (get_peer_control(port->ifname, &peer_control) == cmd_success) {
		peer_control.RxDCBTLVState = DCB_PEER_EXPIRED;
		put_peer_control(port->ifname, &peer_control);
	} else {
		return (u8)-1;
	}

	if (EventFlag != 0) {
		/* process for all subtypes */
		run_dcb_protocol(port->ifname, EventFlag, DCB_MAX_APPTLV+1);
		EventFlag = 0;
	}
	return 0;
}