drivers/staging/rtl8188eu/os_dep/xmit_linux.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
   5  *
   6  ******************************************************************************/
   7 #define _XMIT_OSDEP_C_
   8
   9 #include <osdep_service.h>
  10 #include <drv_types.h>
  11
  12 #include <wifi.h>
  13 #include <mlme_osdep.h>
  14 #include <xmit_osdep.h>
  15 #include <osdep_intf.h>
  16
  17 int rtw_os_xmit_resource_alloc(struct xmit_buf *pxmitbuf, u32 alloc_sz)
  18 {
  19         int i;
  20
  21         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  22         if (!pxmitbuf->pallocated_buf)
  23                 return _FAIL;
  24
  25         pxmitbuf->pbuf = PTR_ALIGN(pxmitbuf->pallocated_buf, XMITBUF_ALIGN_SZ);
  26
  27         for (i = 0; i < 8; i++) {
  28                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  29                 if (!pxmitbuf->pxmit_urb[i])
  30                         return _FAIL;
  31         }
  32         return _SUCCESS;
  33 }
  34
  35 void rtw_os_xmit_resource_free(struct xmit_buf *pxmitbuf)
  36 {
  37         int i;
  38
  39         for (i = 0; i < 8; i++)
  40                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
  41
  42         kfree(pxmitbuf->pallocated_buf);
  43 }
  44
  45 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME * 2 / 5)
  46
  47 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
  48 {
  49         u16 queue;
  50         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  51
  52         queue = skb_get_queue_mapping(pkt);
  53         if (padapter->registrypriv.wifi_spec) {
  54                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
  55                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
  56                         netif_wake_subqueue(padapter->pnetdev, queue);
  57         } else {
  58                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
  59                         netif_wake_subqueue(padapter->pnetdev, queue);
  60         }
  61
  62         dev_kfree_skb_any(pkt);
  63 }
  64
  65 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
  66 {
  67         if (pxframe->pkt)
  68                 rtw_os_pkt_complete(padapter, pxframe->pkt);
  69         pxframe->pkt = NULL;
  70 }
  71
  72 void rtw_os_xmit_schedule(struct adapter *padapter)
  73 {
  74         struct xmit_priv *pxmitpriv;
  75
  76         if (!padapter)
  77                 return;
  78
  79         pxmitpriv = &padapter->xmitpriv;
  80
  81         spin_lock_bh(&pxmitpriv->lock);
  82
  83         if (rtw_txframes_pending(padapter))
  84                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
  85
  86         spin_unlock_bh(&pxmitpriv->lock);
  87 }
  88
  89 static void rtw_check_xmit_resource(struct adapter *padapter,
  90                                     struct sk_buff *pkt)
  91 {
  92         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  93         u16 queue;
  94
  95         queue = skb_get_queue_mapping(pkt);
  96         if (padapter->registrypriv.wifi_spec) {
  97                 /* No free space for Tx, tx_worker is too slow */
  98                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
  99                         netif_stop_subqueue(padapter->pnetdev, queue);
 100         } else {
 101                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 102                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 103                                 netif_stop_subqueue(padapter->pnetdev, queue);
 104                 }
 105         }
 106 }
 107
 108 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 109 {
 110         struct sta_priv *pstapriv = &padapter->stapriv;
 111         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 112         struct list_head *phead, *plist;
 113         struct sk_buff *newskb;
 114         struct sta_info *psta = NULL;
 115         s32 res;
 116
 117         spin_lock_bh(&pstapriv->asoc_list_lock);
 118         phead = &pstapriv->asoc_list;
 119         /* free sta asoc_queue */
 120         list_for_each(plist, phead) {
 121                 psta = list_entry(plist, struct sta_info, asoc_list);
 122
 123                 /* avoid come from STA1 and send back STA1 */
 124                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 125                         continue;
 126
 127                 newskb = skb_copy(skb, GFP_ATOMIC);
 128
 129                 if (newskb) {
 130                         memcpy(newskb->data, psta->hwaddr, 6);
 131                         res = rtw_xmit(padapter, &newskb);
 132                         if (res < 0) {
 133                                 pxmitpriv->tx_drop++;
 134                                 dev_kfree_skb_any(newskb);
 135                         } else {
 136                                 pxmitpriv->tx_pkts++;
 137                         }
 138                 } else {
 139                         pxmitpriv->tx_drop++;
 140
 141                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 142
 143                         /* Caller shall tx this multicast frame
 144                          * via normal way.
 145                          */
 146                         return false;
 147                 }
 148         }
 149
 150         spin_unlock_bh(&pstapriv->asoc_list_lock);
 151         dev_kfree_skb_any(skb);
 152         return true;
 153 }
 154
 155 int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
 156 {
 157         struct adapter *padapter = netdev_priv(pnetdev);
 158         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 159         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 160         s32 res = 0;
 161
 162         if (!rtw_if_up(padapter))
 163                 goto drop_packet;
 164
 165         rtw_check_xmit_resource(padapter, pkt);
 166
 167         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 168             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 169             (padapter->registrypriv.wifi_spec == 0)) {
 170                 if (pxmitpriv->free_xmitframe_cnt > NR_XMITFRAME / 4) {
 171                         res = rtw_mlcst2unicst(padapter, pkt);
 172                         if (res)
 173                                 goto exit;
 174                 }
 175         }
 176
 177         res = rtw_xmit(padapter, &pkt);
 178         if (res < 0)
 179                 goto drop_packet;
 180
 181         pxmitpriv->tx_pkts++;
 182         goto exit;
 183
 184 drop_packet:
 185         pxmitpriv->tx_drop++;
 186         dev_kfree_skb_any(pkt);
 187 exit:
 188         return NETDEV_TX_OK;
 189 }