// SPDX-License-Identifier: GPL-2.0
/******************************************************************************
 *
 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
 *
 ******************************************************************************/
#include <drv_types.h>
#include <rtw_debug.h>

/*
* Translate the OS dependent @param error_code to OS independent RTW_STATUS_CODE
* @return: one of RTW_STATUS_CODE
*/
inline int RTW_STATUS_CODE(int error_code)
{
        if (error_code >= 0)
                return _SUCCESS;
        return _FAIL;
}

void *_rtw_malloc(u32 sz)
{
        return kmalloc(sz, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
}

void *_rtw_zmalloc(u32 sz)
{
        void *pbuf = _rtw_malloc(sz);

        if (pbuf)
                memset(pbuf, 0, sz);

        return pbuf;
}

inline struct sk_buff *_rtw_skb_alloc(u32 sz)
{
        return __dev_alloc_skb(sz, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
}

inline struct sk_buff *_rtw_skb_copy(const struct sk_buff *skb)
{
        return skb_copy(skb, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
}

inline int _rtw_netif_rx(struct net_device *ndev, struct sk_buff *skb)
{
        skb->dev = ndev;
        return netif_rx(skb);
}

void _rtw_init_queue(struct __queue *pqueue)
{
        INIT_LIST_HEAD(&(pqueue->queue));

        spin_lock_init(&(pqueue->lock));
}

struct net_device *rtw_alloc_etherdev_with_old_priv(int sizeof_priv, void *old_priv)
{
        struct net_device *pnetdev;
        struct rtw_netdev_priv_indicator *pnpi;

        pnetdev = alloc_etherdev_mq(sizeof(struct rtw_netdev_priv_indicator), 4);
        if (!pnetdev)
                goto RETURN;

        pnpi = netdev_priv(pnetdev);
        pnpi->priv = old_priv;
        pnpi->sizeof_priv = sizeof_priv;

RETURN:
        return pnetdev;
}

struct net_device *rtw_alloc_etherdev(int sizeof_priv)
{
        struct net_device *pnetdev;
        struct rtw_netdev_priv_indicator *pnpi;

        pnetdev = alloc_etherdev_mq(sizeof(struct rtw_netdev_priv_indicator), 4);
        if (!pnetdev)
                goto RETURN;

        pnpi = netdev_priv(pnetdev);

        pnpi->priv = vzalloc(sizeof_priv);
        if (!pnpi->priv) {
                free_netdev(pnetdev);
                pnetdev = NULL;
                goto RETURN;
        }

        pnpi->sizeof_priv = sizeof_priv;
RETURN:
        return pnetdev;
}

void rtw_free_netdev(struct net_device *netdev)
{
        struct rtw_netdev_priv_indicator *pnpi;

        if (!netdev)
                goto RETURN;

        pnpi = netdev_priv(netdev);

        if (!pnpi->priv)
                goto RETURN;

        vfree(pnpi->priv);
        free_netdev(netdev);

RETURN:
        return;
}

int rtw_change_ifname(struct adapter *padapter, const char *ifname)
{
        struct net_device *pnetdev;
        struct net_device *cur_pnetdev;
        struct rereg_nd_name_data *rereg_priv;
        int ret;

        if (!padapter)
                goto error;

        cur_pnetdev = padapter->pnetdev;
        rereg_priv = &padapter->rereg_nd_name_priv;

        /* free the old_pnetdev */
        if (rereg_priv->old_pnetdev) {
                free_netdev(rereg_priv->old_pnetdev);
                rereg_priv->old_pnetdev = NULL;
        }

        if (!rtnl_is_locked())
                unregister_netdev(cur_pnetdev);
        else
                unregister_netdevice(cur_pnetdev);

        rereg_priv->old_pnetdev = cur_pnetdev;

        pnetdev = rtw_init_netdev(padapter);
        if (!pnetdev)
                goto error;

        SET_NETDEV_DEV(pnetdev, dvobj_to_dev(adapter_to_dvobj(padapter)));

        rtw_init_netdev_name(pnetdev, ifname);

        memcpy(pnetdev->dev_addr, padapter->eeprompriv.mac_addr, ETH_ALEN);

        if (!rtnl_is_locked())
                ret = register_netdev(pnetdev);
        else
                ret = register_netdevice(pnetdev);

        if (ret != 0)
                goto error;

        return 0;

error:
        return -1;
}

void rtw_buf_free(u8 **buf, u32 *buf_len)
{
        if (!buf || !buf_len)
                return;

        if (*buf) {
                *buf_len = 0;
                kfree(*buf);
                *buf = NULL;
        }
}

void rtw_buf_update(u8 **buf, u32 *buf_len, u8 *src, u32 src_len)
{
        u32 ori_len = 0, dup_len = 0;
        u8 *ori = NULL;
        u8 *dup = NULL;

        if (!buf || !buf_len)
                return;

        if (!src || !src_len)
                goto keep_ori;

        /* duplicate src */
        dup = rtw_malloc(src_len);
        if (dup) {
                dup_len = src_len;
                memcpy(dup, src, dup_len);
        }

keep_ori:
        ori = *buf;
        ori_len = *buf_len;

        /* replace buf with dup */
        *buf_len = 0;
        *buf = dup;
        *buf_len = dup_len;

        /* free ori */
        if (ori && ori_len > 0)
                kfree(ori);
}


/**
 * rtw_cbuf_full - test if cbuf is full
 * @cbuf: pointer of struct rtw_cbuf
 *
 * Returns: true if cbuf is full
 */
inline bool rtw_cbuf_full(struct rtw_cbuf *cbuf)
{
        return (cbuf->write == cbuf->read - 1) ? true : false;
}

/**
 * rtw_cbuf_empty - test if cbuf is empty
 * @cbuf: pointer of struct rtw_cbuf
 *
 * Returns: true if cbuf is empty
 */
inline bool rtw_cbuf_empty(struct rtw_cbuf *cbuf)
{
        return (cbuf->write == cbuf->read) ? true : false;
}

/**
 * rtw_cbuf_push - push a pointer into cbuf
 * @cbuf: pointer of struct rtw_cbuf
 * @buf: pointer to push in
 *
 * Lock free operation, be careful of the use scheme
 * Returns: true push success
 */
bool rtw_cbuf_push(struct rtw_cbuf *cbuf, void *buf)
{
        if (rtw_cbuf_full(cbuf))
                return _FAIL;

        cbuf->bufs[cbuf->write] = buf;
        cbuf->write = (cbuf->write + 1) % cbuf->size;

        return _SUCCESS;
}

/**
 * rtw_cbuf_pop - pop a pointer from cbuf
 * @cbuf: pointer of struct rtw_cbuf
 *
 * Lock free operation, be careful of the use scheme
 * Returns: pointer popped out
 */
void *rtw_cbuf_pop(struct rtw_cbuf *cbuf)
{
        void *buf;
        if (rtw_cbuf_empty(cbuf))
                return NULL;

        buf = cbuf->bufs[cbuf->read];
        cbuf->read = (cbuf->read + 1) % cbuf->size;

        return buf;
}

/**
 * rtw_cbuf_alloc - allocate a rtw_cbuf with given size and do initialization
 * @size: size of pointer
 *
 * Returns: pointer of srtuct rtw_cbuf, NULL for allocation failure
 */
struct rtw_cbuf *rtw_cbuf_alloc(u32 size)
{
        struct rtw_cbuf *cbuf;

        cbuf = rtw_malloc(sizeof(*cbuf) + sizeof(void *) * size);

        if (cbuf) {
                cbuf->write = cbuf->read = 0;
                cbuf->size = size;
        }

        return cbuf;
}