recv_linux.c

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/******************************************************************************
 * recv_linux.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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 Street, Fifth Floor, Boston, MA 02110, USA
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <[email protected]>.
 * Larry Finger <[email protected]>
 *
 ******************************************************************************/

#define _RECV_OSDEP_C_

#include <linux/usb.h>

#include "osdep_service.h"
#include "drv_types.h"
#include "wifi.h"
#include "recv_osdep.h"
#include "osdep_intf.h"
#include "ethernet.h"
#include <linux/if_arp.h>
#include "usb_ops.h"

/*init os related resource in struct recv_priv*/
/*alloc os related resource in union recv_frame*/
int r8712_os_recv_resource_alloc(struct _adapter *padapter,
                 union recv_frame *precvframe)
{
    precvframe->u.hdr.pkt_newalloc = precvframe->u.hdr.pkt = NULL;
    return _SUCCESS;
}

/*alloc os related resource in struct recv_buf*/
int r8712_os_recvbuf_resource_alloc(struct _adapter *padapter,
                    struct recv_buf *precvbuf)
{
    int res = _SUCCESS;

    precvbuf->irp_pending = false;
    precvbuf->purb = usb_alloc_urb(0, GFP_KERNEL);
    if (precvbuf->purb == NULL)
        res = _FAIL;
    precvbuf->pskb = NULL;
    precvbuf->reuse = false;
    precvbuf->pallocated_buf = NULL;
    precvbuf->pbuf = NULL;
    precvbuf->pdata = NULL;
    precvbuf->phead = NULL;
    precvbuf->ptail = NULL;
    precvbuf->pend = NULL;
    precvbuf->transfer_len = 0;
    precvbuf->len = 0;
    return res;
}

/*free os related resource in struct recv_buf*/
int r8712_os_recvbuf_resource_free(struct _adapter *padapter,
                 struct recv_buf *precvbuf)
{
    if (precvbuf->pskb)
        dev_kfree_skb_any(precvbuf->pskb);
    if (precvbuf->purb) {
        usb_kill_urb(precvbuf->purb);
        usb_free_urb(precvbuf->purb);
    }
    return _SUCCESS;
}

void r8712_handle_tkip_mic_err(struct _adapter *padapter, u8 bgroup)
{
    union iwreq_data wrqu;
    struct iw_michaelmicfailure ev;
    struct mlme_priv *pmlmepriv  = &padapter->mlmepriv;

    memset(&ev, 0x00, sizeof(ev));
    if (bgroup)
        ev.flags |= IW_MICFAILURE_GROUP;
    else
        ev.flags |= IW_MICFAILURE_PAIRWISE;
    ev.src_addr.sa_family = ARPHRD_ETHER;
    memcpy(ev.src_addr.sa_data, &pmlmepriv->assoc_bssid[0], ETH_ALEN);
    memset(&wrqu, 0x00, sizeof(wrqu));
    wrqu.data.length = sizeof(ev);
    wireless_send_event(padapter->pnetdev, IWEVMICHAELMICFAILURE, &wrqu,
                (char *)&ev);
}

void r8712_recv_indicatepkt(struct _adapter *padapter,
                union recv_frame *precv_frame)
{
    struct recv_priv *precvpriv;
    struct  __queue *pfree_recv_queue;
    _pkt *skb;
    struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;

    precvpriv = &(padapter->recvpriv);
    pfree_recv_queue = &(precvpriv->free_recv_queue);
    skb = precv_frame->u.hdr.pkt;
    if (skb == NULL)
        goto _recv_indicatepkt_drop;
    skb->data = precv_frame->u.hdr.rx_data;
    skb->len = precv_frame->u.hdr.len;
    skb_set_tail_pointer(skb, skb->len);
    if ((pattrib->tcpchk_valid == 1) && (pattrib->tcp_chkrpt == 1))
        skb->ip_summed = CHECKSUM_UNNECESSARY;
    else
        skb->ip_summed = CHECKSUM_NONE;
    skb->dev = padapter->pnetdev;
    skb->protocol = eth_type_trans(skb, padapter->pnetdev);
    netif_rx(skb);
    precv_frame->u.hdr.pkt = NULL; /* pointers to NULL before
                    * r8712_free_recvframe() */
    r8712_free_recvframe(precv_frame, pfree_recv_queue);
    return;
_recv_indicatepkt_drop:
     /*enqueue back to free_recv_queue*/
     if (precv_frame)
        r8712_free_recvframe(precv_frame, pfree_recv_queue);
     precvpriv->rx_drop++;
}

void r8712_os_read_port(struct _adapter *padapter, struct recv_buf *precvbuf)
{
    struct recv_priv *precvpriv = &padapter->recvpriv;

    precvbuf->ref_cnt--;
    /*free skb in recv_buf*/
    dev_kfree_skb_any(precvbuf->pskb);
    precvbuf->pskb = NULL;
    precvbuf->reuse = false;
    if (precvbuf->irp_pending == false)
        r8712_read_port(padapter, precvpriv->ff_hwaddr, 0,
             (unsigned char *)precvbuf);
}

static void _r8712_reordering_ctrl_timeout_handler (void *FunctionContext)
{
    struct recv_reorder_ctrl *preorder_ctrl =
             (struct recv_reorder_ctrl *)FunctionContext;

    r8712_reordering_ctrl_timeout_handler(preorder_ctrl);
}

void r8712_init_recv_timer(struct recv_reorder_ctrl *preorder_ctrl)
{
    struct _adapter *padapter = preorder_ctrl->padapter;

    _init_timer(&(preorder_ctrl->reordering_ctrl_timer), padapter->pnetdev,
            _r8712_reordering_ctrl_timeout_handler, preorder_ctrl);
}