/*
<:copyright-BRCM:2016:DUAL/GPL:standard

   Broadcom Proprietary and Confidential.(c) 2016 Broadcom
   All Rights Reserved

Unless you and Broadcom execute a separate written software license
agreement governing use of this software, this software is licensed
to you under the terms of the GNU General Public License version 2
(the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php,
with the following added to such license:

   As a special exception, the copyright holders of this software give
   you permission to link this software with independent modules, and
   to copy and distribute the resulting executable under terms of your
   choice, provided that you also meet, for each linked independent
   module, the terms and conditions of the license of that module.
   An independent module is a module which is not derived from this
   software.  The special exception does not apply to any modifications
   of the software.

Not withstanding the above, under no circumstances may you combine
this software in any way with any other Broadcom software provided
under a license other than the GPL, without Broadcom's express prior
written consent.

:>
*/

/* This file contains the pieces of the OAM negotiation state machine that are specific to DPoE OAM. */

#include "bcmolt_eon_private.h"
#include "../oam_common.h"
#include "dpoe.h"

/* Org specific TLV to send to the ONU */
static const bcmolt_epon_oam_organization_specific_info dpoe_tx_tlv =
{
    .oui = BCMOLT_EPON_OAM_WELL_KNOWN_OUI_DPOE,
    .u =
    {
        .dpoe =
        {
            .dpoe_info_tlv =
            {
                .type = BCMOLT_EPON_OAM_DPOE_INFO_TLV_TYPE_DPOE_OAM_SUPPORT,
                .u =
                {
                    .dpoe_oam_support =
                    {
                        .dpoe_oam_version = 0x11
                    }
                }
            }
        }
    }
};

void dpoe_tx_add_tlv(eon_link_state *link_state, bcmolt_epon_oam_oam_pdu_content *oam)
{
    if ((LOCAL_EVAL_REMOTE_EVAL == link_state->oam_state) ||
        (LOCAL_STABLE_REMOTE_EVAL == link_state->oam_state))
    {
        oam->u.info.tlvs[oam->u.info.tlvs_count].type = BCMOLT_EPON_OAM_INFO_TLV_TYPE_ORGANIZATION_SPECIFIC;
        oam->u.info.tlvs[oam->u.info.tlvs_count].u.organization_specific.value = dpoe_tx_tlv;
        oam->u.info.tlvs_count++;
    }
}

void dpoe_rx_tlv(
    eon_link_state *link_state,
    bcmolt_epon_oam_organization_specific_info *org_spec,
    bcmos_errno *rc)
{
    if (link_state->oam_state == LOCAL_STABLE_REMOTE_STABLE)
    {
        if (NULL != org_spec)
        {
            EON_LINK_LOG(INFO, &link_state->link_key, "Got unexpected organization specific TLV\n");
            *rc = BCM_ERR_ONU_ERR_RESP;
        }
    }
    else
    {
        if ((NULL == org_spec) ||
            (BCMOLT_EPON_OAM_WELL_KNOWN_OUI_DPOE != org_spec->oui) ||
            (BCMOLT_EPON_OAM_DPOE_INFO_TLV_TYPE_DPOE_OAM_SUPPORT != org_spec->u.dpoe.dpoe_info_tlv.type))
        {
            EON_LINK_LOG(INFO, &link_state->link_key, "Didn't get DPoE TLV\n");
            *rc = BCM_ERR_ONU_ERR_RESP;
        }
        else
        {
            switch (org_spec->u.dpoe.dpoe_info_tlv.u.dpoe_oam_support.dpoe_oam_version)
            {
                case 0x22:
                case 0x21:
                case 0x20:
                case 0x11: /* DPoE v1.0 I05 and higher */
                    break;
                case 0x01: /* backwards compatibility, same as 0x10 */
                case 0x02: /* pre-DPoE OAM, no Certificate Authority support */
                case 0x03: /* pre-DPoE OAM, with Certificate Authority support */
                case 0x10: /* DPoE v1.0 I04 and lower */
                    EON_LINK_LOG(
                        WARNING, &link_state->link_key,
                        "DPoE TLV contained old version: %u (some features may not work)\n",
                        org_spec->u.dpoe.dpoe_info_tlv.u.dpoe_oam_support.dpoe_oam_version);
                    break;
                case 0x00: /* workaround for EASW-17839 */
                    break;
                default:
                    EON_LINK_LOG(
                        ERROR, &link_state->link_key, "DPoE TLV contained bad version: %u\n",
                        org_spec->u.dpoe.dpoe_info_tlv.u.dpoe_oam_support.dpoe_oam_version);
                    *rc = BCM_ERR_NOT_SUPPORTED;
                    break;
            }
        }
    }
}