/*
   <:copyright-BRCM:2015:DUAL/GPL:standard

      Copyright (c) 2015 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.

   :>
 */

/*
 *  Created on: Mar/2019
 *      Author: steven.hsieh@broadcom.com
 */

#if defined(CONFIG_NET_SWITCHDEV)

#include <bcmnet.h>
#include "port.h"
#include "enet.h"
#include "sf2.h"
#include "sf2_common.h"
#include "linux/if_bridge.h"
#include "linux/netdevice.h"

extern int get_port_by_leaf_dev(struct net_device *leaf_dev, enetx_port_t **port);

int sf2_switchdev_port_attr_get(struct net_device *dev,
                                struct switchdev_attr *attr)
{
    enetx_port_t *port = NULL;

    get_port_by_leaf_dev(dev, &port);

    switch (attr->id) {
    case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
        if (port) {
            attr->u.ppid.id_len = sizeof(port->obj_name) > MAX_PHYS_ITEM_ID_LEN ? MAX_PHYS_ITEM_ID_LEN : sizeof(port->obj_name);
            // if port is not hw fwd enabled, use its own name to differentiate from real switch name
            memcpy(&attr->u.ppid.id, is_netdev_hw_switch(port->dev) ?port->p.parent_sw->obj_name : port->obj_name, attr->u.ppid.id_len);
            enet_dbgv("dev:%s attr->id:%d PORT_PARENT_ID parenet=%s\n", dev->name, attr->id, attr->u.ppid.id);
        }
        break;
//    case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
//        break;
    case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS_SUPPORT:
        enet_dbgv("dev:%s attr->id:%d PORT_BRIDGE_FLAGS_SUPPORT\n", dev->name, attr->id);
        attr->u.brport_flags_support = BR_LEARNING;
        break;
    default:
        enet_dbgv("dev:%s attr->id:%d ret -EOPNOTSUPP\n", dev->name, attr->id);
        return -EOPNOTSUPP;
    }

    return 0;
}

int sf2_switchdev_port_attr_set(struct net_device *dev,
                                const struct switchdev_attr *attr,
                                struct switchdev_trans *trans)
{
    enetx_port_t *port = NULL;
    int err = 0;

    get_port_by_leaf_dev(dev, &port);

    switch (attr->id) {
    case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
        enet_dbgv("dev:%s attr->id:%d %s PORT_STP_STATE=%d\n", dev->name, attr->id,  switchdev_trans_ph_commit(trans) ? "commit":"prepare", attr->u.stp_state);
        if (switchdev_trans_ph_prepare(trans)) return 0;
        if (port)
            err = port_sw_port_stp_set(port, STP_MODE_UNCHANGED, attr->u.stp_state);

        if (attr->u.stp_state == STP_BLOCKING) {
            // update if device has hw fdb when enter STP_BLOCKING (most likely device just join bridge, or link comes up)
            // flag is used to determine if non-hw fdb device learned a MAC and need to clear from hw fdb
            if (port && is_netdev_hw_switch(port->dev))
                netdev_hw_fdb_set(dev);
            else
                netdev_hw_fdb_unset(dev);
        }
        break;
//    case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
//        break;
    default:
        enet_dbgv("dev:%s attr->id:%d %s ret -EOPNOTSUPP\n", dev->name, attr->id,  switchdev_trans_ph_commit(trans) ? "commit":"prepare");
        err = -EOPNOTSUPP;
        break;
    }

    return err;
}

/* Called under rcu_read_lock() */
static int sf2_switchdev_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
    struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
    struct switchdev_notifier_fdb_info *fdb_info = ptr;

    /* We want to purge ARL entry from SF2 when the learning happened in non SF2 port, so should
       return on board without SF2 */
    if (!sf2_sw)
        return NOTIFY_DONE;

    switch (event) {
    case SWITCHDEV_FDB_ADD_TO_DEVICE:
        // only care about non-sf2 port or sf2 softswitching port learning new mac, need to clear sf2 arl
        if (!is_netdev_hw_fdb(dev) && memcmp(fdb_info->addr, dev->dev_addr, ETH_ALEN)) {
            remove_arl_entry_wrapper((void*)(fdb_info->addr));
        }
        break;
    case SWITCHDEV_FDB_DEL_TO_DEVICE:
        break;
    }
    return NOTIFY_DONE;
}

static struct notifier_block sf2_switchdev_notifier = {
    .notifier_call = sf2_switchdev_event,
};

int sf2_switchdev_init(void)
{
    int err;
    err = register_switchdev_notifier(&sf2_switchdev_notifier);
    if (err) {
        enet_err("Failed to register switchdev notifier\n");
        return err;
    }
    return 0;
}
#endif //CONFIG_NET_SWITCHDEV