kernel/drivers/staging/rtl8723au/os_dep/xmit_linux.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  ******************************************************************************/
  15 #define _XMIT_OSDEP_C_
  16
  17 #include <osdep_service.h>
  18 #include <drv_types.h>
  19
  20 #include <linux/if_ether.h>
  21 #include <linux/ip.h>
  22 #include <wifi.h>
  23 #include <mlme_osdep.h>
  24 #include <xmit_osdep.h>
  25 #include <osdep_intf.h>
  26
  27 int rtw_os_xmit_resource_alloc23a(struct rtw_adapter *padapter,
  28                                struct xmit_buf *pxmitbuf, u32 alloc_sz)
  29 {
  30         int i;
  31
  32         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  33         if (pxmitbuf->pallocated_buf == NULL)
  34                 return _FAIL;
  35
  36         pxmitbuf->pbuf = PTR_ALIGN(pxmitbuf->pallocated_buf, XMITBUF_ALIGN_SZ);
  37
  38         for (i = 0; i < 8; i++) {
  39                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  40                 if (pxmitbuf->pxmit_urb[i] == NULL) {
  41                         DBG_8723A("pxmitbuf->pxmit_urb[i]==NULL");
  42                         return _FAIL;
  43                 }
  44         }
  45         return _SUCCESS;
  46 }
  47
  48 void rtw_os_xmit_resource_free23a(struct rtw_adapter *padapter,
  49                                struct xmit_buf *pxmitbuf)
  50 {
  51         int i;
  52
  53         for (i = 0; i < 8; i++)
  54                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
  55         kfree(pxmitbuf->pallocated_buf);
  56 }
  57
  58 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
  59
  60 void rtw_os_pkt_complete23a(struct rtw_adapter *padapter, struct sk_buff *pkt)
  61 {
  62         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  63         u16     queue;
  64
  65         queue = skb_get_queue_mapping(pkt);
  66         if (padapter->registrypriv.wifi_spec) {
  67                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
  68                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
  69                         netif_wake_subqueue(padapter->pnetdev, queue);
  70         } else {
  71                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
  72                         netif_wake_subqueue(padapter->pnetdev, queue);
  73         }
  74         dev_kfree_skb_any(pkt);
  75 }
  76
  77 void rtw_os_xmit_complete23a(struct rtw_adapter *padapter,
  78                           struct xmit_frame *pxframe)
  79 {
  80         if (pxframe->pkt)
  81                 rtw_os_pkt_complete23a(padapter, pxframe->pkt);
  82
  83         pxframe->pkt = NULL;
  84 }
  85
  86 void rtw_os_xmit_schedule23a(struct rtw_adapter *padapter)
  87 {
  88         struct xmit_priv *pxmitpriv;
  89
  90         if (!padapter)
  91                 return;
  92         pxmitpriv = &padapter->xmitpriv;
  93
  94         spin_lock_bh(&pxmitpriv->lock);
  95
  96         if (rtw_txframes_pending23a(padapter))
  97                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
  98         spin_unlock_bh(&pxmitpriv->lock);
  99 }
 100
 101 static void rtw_check_xmit_resource(struct rtw_adapter *padapter,
 102                                     struct sk_buff *pkt)
 103 {
 104         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 105         u16     queue;
 106
 107         queue = skb_get_queue_mapping(pkt);
 108         if (padapter->registrypriv.wifi_spec) {
 109                 /* No free space for Tx, tx_worker is too slow */
 110                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 111                         netif_stop_subqueue(padapter->pnetdev, queue);
 112         } else {
 113                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 114                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 115                                 netif_stop_subqueue(padapter->pnetdev, queue);
 116                 }
 117         }
 118 }
 119
 120 int rtw_xmit23a_entry23a(struct sk_buff *skb, struct net_device *pnetdev)
 121 {
 122         struct rtw_adapter *padapter = netdev_priv(pnetdev);
 123         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 124         int res = 0;
 125
 126         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, "+xmit_enry\n");
 127
 128         if (!rtw_if_up23a(padapter)) {
 129                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_,
 130                          "rtw_xmit23a_entry23a: rtw_if_up23a fail\n");
 131                 goto drop_packet;
 132         }
 133
 134         rtw_check_xmit_resource(padapter, skb);
 135
 136         res = rtw_xmit23a(padapter, skb);
 137         if (res < 0)
 138                 goto drop_packet;
 139
 140         pxmitpriv->tx_pkts++;
 141         RT_TRACE(_module_xmit_osdep_c_, _drv_info_,
 142                  "rtw_xmit23a_entry23a: tx_pkts=%d\n",
 143                  (u32)pxmitpriv->tx_pkts);
 144         goto exit;
 145
 146 drop_packet:
 147         pxmitpriv->tx_drop++;
 148         dev_kfree_skb_any(skb);
 149         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_,
 150                  "rtw_xmit23a_entry23a: drop, tx_drop=%d\n",
 151                  (u32)pxmitpriv->tx_drop);
 152 exit:
 153         return 0;
 154 }