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                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  31                         return _FAIL;
  32                 }
  33         }
  34         return _SUCCESS;
  35 }
  36
  37 void rtw_os_xmit_resource_free(struct xmit_buf *pxmitbuf)
  38 {
  39         int i;
  40
  41         for (i = 0; i < 8; i++)
  42                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
  43
  44         kfree(pxmitbuf->pallocated_buf);
  45 }
  46
  47 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME * 2 / 5)
  48
  49 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
  50 {
  51         u16 queue;
  52         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  53
  54         queue = skb_get_queue_mapping(pkt);
  55         if (padapter->registrypriv.wifi_spec) {
  56                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
  57                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
  58                         netif_wake_subqueue(padapter->pnetdev, queue);
  59         } else {
  60                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
  61                         netif_wake_subqueue(padapter->pnetdev, queue);
  62         }
  63
  64         dev_kfree_skb_any(pkt);
  65 }
  66
  67 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
  68 {
  69         if (pxframe->pkt)
  70                 rtw_os_pkt_complete(padapter, pxframe->pkt);
  71         pxframe->pkt = NULL;
  72 }
  73
  74 void rtw_os_xmit_schedule(struct adapter *padapter)
  75 {
  76         struct xmit_priv *pxmitpriv;
  77
  78         if (!padapter)
  79                 return;
  80
  81         pxmitpriv = &padapter->xmitpriv;
  82
  83         spin_lock_bh(&pxmitpriv->lock);
  84
  85         if (rtw_txframes_pending(padapter))
  86                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
  87
  88         spin_unlock_bh(&pxmitpriv->lock);
  89 }
  90
  91 static void rtw_check_xmit_resource(struct adapter *padapter,
  92                                     struct sk_buff *pkt)
  93 {
  94         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  95         u16 queue;
  96
  97         queue = skb_get_queue_mapping(pkt);
  98         if (padapter->registrypriv.wifi_spec) {
  99                 /* No free space for Tx, tx_worker is too slow */
 100                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 101                         netif_stop_subqueue(padapter->pnetdev, queue);
 102         } else {
 103                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 104                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 105                                 netif_stop_subqueue(padapter->pnetdev, queue);
 106                 }
 107         }
 108 }
 109
 110 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 111 {
 112         struct sta_priv *pstapriv = &padapter->stapriv;
 113         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 114         struct list_head *phead, *plist;
 115         struct sk_buff *newskb;
 116         struct sta_info *psta = NULL;
 117         s32 res;
 118
 119         spin_lock_bh(&pstapriv->asoc_list_lock);
 120         phead = &pstapriv->asoc_list;
 121         plist = phead->next;
 122
 123         /* free sta asoc_queue */
 124         while (phead != plist) {
 125                 psta = container_of(plist, struct sta_info, asoc_list);
 126
 127                 plist = plist->next;
 128
 129                 /* avoid come from STA1 and send back STA1 */
 130                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 131                         continue;
 132
 133                 newskb = skb_copy(skb, GFP_ATOMIC);
 134
 135                 if (newskb) {
 136                         memcpy(newskb->data, psta->hwaddr, 6);
 137                         res = rtw_xmit(padapter, &newskb);
 138                         if (res < 0) {
 139                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n",
 140                                         __func__, __LINE__);
 141                                 pxmitpriv->tx_drop++;
 142                                 dev_kfree_skb_any(newskb);
 143                         } else {
 144                                 pxmitpriv->tx_pkts++;
 145                         }
 146                 } else {
 147                         DBG_88E("%s-%d: skb_copy() failed!\n",
 148                                 __func__, __LINE__);
 149                         pxmitpriv->tx_drop++;
 150
 151                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 152
 153                         /* Caller shall tx this multicast frame
 154                          * via normal way.
 155                          */
 156                         return false;
 157                 }
 158         }
 159
 160         spin_unlock_bh(&pstapriv->asoc_list_lock);
 161         dev_kfree_skb_any(skb);
 162         return true;
 163 }
 164
 165 int rtw_xmit_entry(struct sk_buff *pkt, struct net_device *pnetdev)
 166 {
 167         struct adapter *padapter = rtw_netdev_priv(pnetdev);
 168         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 169         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 170         s32 res = 0;
 171
 172         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 173
 174         if (!rtw_if_up(padapter)) {
 175                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_,
 176                          ("%s: rtw_if_up fail\n", __func__));
 177                 goto drop_packet;
 178         }
 179
 180         rtw_check_xmit_resource(padapter, pkt);
 181
 182         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 183             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 184             (padapter->registrypriv.wifi_spec == 0)) {
 185                 if (pxmitpriv->free_xmitframe_cnt > NR_XMITFRAME / 4) {
 186                         res = rtw_mlcst2unicst(padapter, pkt);
 187                         if (res)
 188                                 goto exit;
 189                 }
 190         }
 191
 192         res = rtw_xmit(padapter, &pkt);
 193         if (res < 0)
 194                 goto drop_packet;
 195
 196         pxmitpriv->tx_pkts++;
 197         RT_TRACE(_module_xmit_osdep_c_, _drv_info_,
 198                  ("%s: tx_pkts=%d\n", __func__, (u32)pxmitpriv->tx_pkts));
 199         goto exit;
 200
 201 drop_packet:
 202         pxmitpriv->tx_drop++;
 203         dev_kfree_skb_any(pkt);
 204         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_,
 205                  ("%s: drop, tx_drop=%d\n", __func__, (u32)pxmitpriv->tx_drop));
 206
 207 exit:
 208         return 0;
 209 }