drivers/staging/rtl8188eu/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 <wifi.h>
  21 #include <mlme_osdep.h>
  22 #include <xmit_osdep.h>
  23 #include <osdep_intf.h>
  24
  25 uint rtw_remainder_len(struct pkt_file *pfile)
  26 {
  27         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  28                (size_t)(pfile->buf_start));
  29 }
  30
  31 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  32 {
  33
  34         pfile->pkt = pktptr;
  35         pfile->cur_addr = pktptr->data;
  36         pfile->buf_start = pktptr->data;
  37         pfile->pkt_len = pktptr->len;
  38         pfile->buf_len = pktptr->len;
  39
  40         pfile->cur_buffer = pfile->buf_start;
  41
  42 }
  43
  44 uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen)
  45 {
  46         uint    len = 0;
  47
  48
  49         len =  rtw_remainder_len(pfile);
  50         len = min(rlen, len);
  51
  52         if (rmem)
  53                 skb_copy_bits(pfile->pkt, pfile->buf_len-pfile->pkt_len, rmem, len);
  54
  55         pfile->cur_addr += len;
  56         pfile->pkt_len -= len;
  57
  58
  59         return len;
  60 }
  61
  62 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  63 {
  64         int i;
  65
  66         pxmitbuf->pallocated_buf = kzalloc(alloc_sz, GFP_KERNEL);
  67         if (pxmitbuf->pallocated_buf == NULL)
  68                 return _FAIL;
  69
  70         pxmitbuf->pbuf = PTR_ALIGN(pxmitbuf->pallocated_buf, XMITBUF_ALIGN_SZ);
  71         pxmitbuf->dma_transfer_addr = 0;
  72
  73         for (i = 0; i < 8; i++) {
  74                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  75                 if (!pxmitbuf->pxmit_urb[i]) {
  76                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  77                         return _FAIL;
  78                 }
  79         }
  80         return _SUCCESS;
  81 }
  82
  83 void rtw_os_xmit_resource_free(struct xmit_buf *pxmitbuf)
  84 {
  85         int i;
  86
  87         for (i = 0; i < 8; i++)
  88                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
  89
  90         kfree(pxmitbuf->pallocated_buf);
  91 }
  92
  93 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
  94
  95 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
  96 {
  97         u16     queue;
  98         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
  99
 100         queue = skb_get_queue_mapping(pkt);
 101         if (padapter->registrypriv.wifi_spec) {
 102                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 103                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 104                         netif_wake_subqueue(padapter->pnetdev, queue);
 105         } else {
 106                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 107                         netif_wake_subqueue(padapter->pnetdev, queue);
 108         }
 109
 110         dev_kfree_skb_any(pkt);
 111 }
 112
 113 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 114 {
 115         if (pxframe->pkt)
 116                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 117         pxframe->pkt = NULL;
 118 }
 119
 120 void rtw_os_xmit_schedule(struct adapter *padapter)
 121 {
 122         struct xmit_priv *pxmitpriv;
 123
 124         if (!padapter)
 125                 return;
 126
 127         pxmitpriv = &padapter->xmitpriv;
 128
 129         spin_lock_bh(&pxmitpriv->lock);
 130
 131         if (rtw_txframes_pending(padapter))
 132                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 133
 134         spin_unlock_bh(&pxmitpriv->lock);
 135 }
 136
 137 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 138 {
 139         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 140         u16     queue;
 141
 142         queue = skb_get_queue_mapping(pkt);
 143         if (padapter->registrypriv.wifi_spec) {
 144                 /* No free space for Tx, tx_worker is too slow */
 145                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 146                         netif_stop_subqueue(padapter->pnetdev, queue);
 147         } else {
 148                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 149                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 150                                 netif_stop_subqueue(padapter->pnetdev, queue);
 151                 }
 152         }
 153 }
 154
 155 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 156 {
 157         struct  sta_priv *pstapriv = &padapter->stapriv;
 158         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 159         struct list_head *phead, *plist;
 160         struct sk_buff *newskb;
 161         struct sta_info *psta = NULL;
 162         s32     res;
 163
 164         spin_lock_bh(&pstapriv->asoc_list_lock);
 165         phead = &pstapriv->asoc_list;
 166         plist = phead->next;
 167
 168         /* free sta asoc_queue */
 169         while (phead != plist) {
 170                 psta = container_of(plist, struct sta_info, asoc_list);
 171
 172                 plist = plist->next;
 173
 174                 /* avoid   come from STA1 and send back STA1 */
 175                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 176                         continue;
 177
 178                 newskb = skb_copy(skb, GFP_ATOMIC);
 179
 180                 if (newskb) {
 181                         memcpy(newskb->data, psta->hwaddr, 6);
 182                         res = rtw_xmit(padapter, &newskb);
 183                         if (res < 0) {
 184                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 185                                 pxmitpriv->tx_drop++;
 186                                 dev_kfree_skb_any(newskb);
 187                         } else {
 188                                 pxmitpriv->tx_pkts++;
 189                         }
 190                 } else {
 191                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 192                         pxmitpriv->tx_drop++;
 193
 194                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 195                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 196                 }
 197         }
 198
 199         spin_unlock_bh(&pstapriv->asoc_list_lock);
 200         dev_kfree_skb_any(skb);
 201         return true;
 202 }
 203
 204
 205 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 206 {
 207         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 208         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 209         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 210         s32 res = 0;
 211
 212
 213         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 214
 215         if (rtw_if_up(padapter) == false) {
 216                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 217                 goto drop_packet;
 218         }
 219
 220         rtw_check_xmit_resource(padapter, pkt);
 221
 222         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 223             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 224             (padapter->registrypriv.wifi_spec == 0)) {
 225                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 226                         res = rtw_mlcst2unicst(padapter, pkt);
 227                         if (res)
 228                                 goto exit;
 229                 }
 230         }
 231
 232         res = rtw_xmit(padapter, &pkt);
 233         if (res < 0)
 234                 goto drop_packet;
 235
 236         pxmitpriv->tx_pkts++;
 237         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 238         goto exit;
 239
 240 drop_packet:
 241         pxmitpriv->tx_drop++;
 242         dev_kfree_skb_any(pkt);
 243         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 244
 245 exit:
 246
 247
 248         return 0;
 249 }