drivers/staging/r8188eu/os_dep/xmit_linux.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2007 - 2012 Realtek Corporation. */
   3
   4 #define _XMIT_OSDEP_C_
   5
   6 #include <linux/version.h>
   7 #include <osdep_service.h>
   8 #include <drv_types.h>
   9
  10 #include <if_ether.h>
  11 #include <ip.h>
  12 #include <wifi.h>
  13 #include <mlme_osdep.h>
  14 #include <xmit_osdep.h>
  15 #include <osdep_intf.h>
  16 #include <usb_osintf.h>
  17
  18 uint rtw_remainder_len(struct pkt_file *pfile)
  19 {
  20         return pfile->buf_len - ((size_t)(pfile->cur_addr) -
  21                (size_t)(pfile->buf_start));
  22 }
  23
  24 void _rtw_open_pktfile(struct sk_buff *pktptr, struct pkt_file *pfile)
  25 {
  26
  27         if (!pktptr) {
  28                 pr_err("8188eu: pktptr is NULL\n");
  29                 return;
  30         }
  31         if (!pfile) {
  32                 pr_err("8188eu: pfile is NULL\n");
  33                 return;
  34         }
  35         pfile->pkt = pktptr;
  36         pfile->cur_addr = pktptr->data;
  37         pfile->buf_start = pktptr->data;
  38         pfile->pkt_len = pktptr->len;
  39         pfile->buf_len = pktptr->len;
  40
  41         pfile->cur_buffer = pfile->buf_start;
  42
  43 }
  44
  45 uint _rtw_pktfile_read (struct pkt_file *pfile, u8 *rmem, uint rlen)
  46 {
  47         uint    len = 0;
  48
  49         len =  rtw_remainder_len(pfile);
  50         len = (rlen > len) ? len : rlen;
  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         return len;
  59 }
  60
  61 int rtw_endofpktfile(struct pkt_file *pfile)
  62 {
  63
  64         if (pfile->pkt_len == 0) {
  65
  66                 return true;
  67         }
  68
  69         return false;
  70 }
  71
  72 void rtw_set_tx_chksum_offload(struct sk_buff *pkt, struct pkt_attrib *pattrib)
  73 {
  74 }
  75
  76 int rtw_os_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *pxmitbuf, u32 alloc_sz)
  77 {
  78         int i;
  79
  80         pxmitbuf->pallocated_buf = rtw_zmalloc(alloc_sz);
  81         if (!pxmitbuf->pallocated_buf)
  82                 return _FAIL;
  83
  84         pxmitbuf->pbuf = (u8 *)N_BYTE_ALIGMENT((size_t)(pxmitbuf->pallocated_buf), XMITBUF_ALIGN_SZ);
  85         pxmitbuf->dma_transfer_addr = 0;
  86
  87         for (i = 0; i < 8; i++) {
  88                 pxmitbuf->pxmit_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
  89                 if (!pxmitbuf->pxmit_urb[i]) {
  90                         DBG_88E("pxmitbuf->pxmit_urb[i]==NULL");
  91                         return _FAIL;
  92                 }
  93         }
  94         return _SUCCESS;
  95 }
  96
  97 void rtw_os_xmit_resource_free(struct adapter *padapter,
  98                                struct xmit_buf *pxmitbuf, u32 free_sz)
  99 {
 100         int i;
 101
 102         for (i = 0; i < 8; i++)
 103                 usb_free_urb(pxmitbuf->pxmit_urb[i]);
 104
 105         kfree(pxmitbuf->pallocated_buf);
 106 }
 107
 108 #define WMM_XMIT_THRESHOLD      (NR_XMITFRAME*2/5)
 109
 110 void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *pkt)
 111 {
 112 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 35))
 113         u16     queue;
 114         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 115
 116         queue = skb_get_queue_mapping(pkt);
 117         if (padapter->registrypriv.wifi_spec) {
 118                 if (__netif_subqueue_stopped(padapter->pnetdev, queue) &&
 119                     (pxmitpriv->hwxmits[queue].accnt < WMM_XMIT_THRESHOLD))
 120                         netif_wake_subqueue(padapter->pnetdev, queue);
 121         } else {
 122                 if (__netif_subqueue_stopped(padapter->pnetdev, queue))
 123                         netif_wake_subqueue(padapter->pnetdev, queue);
 124         }
 125 #else
 126         if (netif_queue_stopped(padapter->pnetdev))
 127                 netif_wake_queue(padapter->pnetdev);
 128 #endif
 129
 130         dev_kfree_skb_any(pkt);
 131 }
 132
 133 void rtw_os_xmit_complete(struct adapter *padapter, struct xmit_frame *pxframe)
 134 {
 135         if (pxframe->pkt)
 136                 rtw_os_pkt_complete(padapter, pxframe->pkt);
 137         pxframe->pkt = NULL;
 138 }
 139
 140 void rtw_os_xmit_schedule(struct adapter *padapter)
 141 {
 142         struct xmit_priv *pxmitpriv;
 143
 144         if (!padapter)
 145                 return;
 146
 147         pxmitpriv = &padapter->xmitpriv;
 148
 149         spin_lock_bh(&pxmitpriv->lock);
 150
 151         if (rtw_txframes_pending(padapter))
 152                 tasklet_hi_schedule(&pxmitpriv->xmit_tasklet);
 153
 154         spin_unlock_bh(&pxmitpriv->lock);
 155 }
 156
 157 static void rtw_check_xmit_resource(struct adapter *padapter, struct sk_buff *pkt)
 158 {
 159         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 160         u16     queue;
 161
 162         queue = skb_get_queue_mapping(pkt);
 163         if (padapter->registrypriv.wifi_spec) {
 164                 /* No free space for Tx, tx_worker is too slow */
 165                 if (pxmitpriv->hwxmits[queue].accnt > WMM_XMIT_THRESHOLD)
 166                         netif_stop_subqueue(padapter->pnetdev, queue);
 167         } else {
 168                 if (pxmitpriv->free_xmitframe_cnt <= 4) {
 169                         if (!netif_tx_queue_stopped(netdev_get_tx_queue(padapter->pnetdev, queue)))
 170                                 netif_stop_subqueue(padapter->pnetdev, queue);
 171                 }
 172         }
 173 }
 174
 175 static int rtw_mlcst2unicst(struct adapter *padapter, struct sk_buff *skb)
 176 {
 177         struct  sta_priv *pstapriv = &padapter->stapriv;
 178         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 179         struct list_head *phead, *plist;
 180         struct sk_buff *newskb;
 181         struct sta_info *psta = NULL;
 182         s32     res;
 183
 184         spin_lock_bh(&pstapriv->asoc_list_lock);
 185         phead = &pstapriv->asoc_list;
 186         plist = phead->next;
 187
 188         /* free sta asoc_queue */
 189         while (phead != plist) {
 190                 psta = container_of(plist, struct sta_info, asoc_list);
 191
 192                 plist = plist->next;
 193
 194                 /* avoid   come from STA1 and send back STA1 */
 195                 if (!memcmp(psta->hwaddr, &skb->data[6], 6))
 196                         continue;
 197
 198                 newskb = skb_copy(skb, GFP_ATOMIC);
 199
 200                 if (newskb) {
 201                         memcpy(newskb->data, psta->hwaddr, 6);
 202                         res = rtw_xmit(padapter, &newskb);
 203                         if (res < 0) {
 204                                 DBG_88E("%s()-%d: rtw_xmit() return error!\n", __func__, __LINE__);
 205                                 pxmitpriv->tx_drop++;
 206                                 dev_kfree_skb_any(newskb);
 207                         } else {
 208                                 pxmitpriv->tx_pkts++;
 209                         }
 210                 } else {
 211                         DBG_88E("%s-%d: skb_copy() failed!\n", __func__, __LINE__);
 212                         pxmitpriv->tx_drop++;
 213
 214                         spin_unlock_bh(&pstapriv->asoc_list_lock);
 215                         return false;   /*  Caller shall tx this multicast frame via normal way. */
 216                 }
 217         }
 218
 219         spin_unlock_bh(&pstapriv->asoc_list_lock);
 220         dev_kfree_skb_any(skb);
 221         return true;
 222 }
 223
 224 int rtw_xmit_entry(struct sk_buff *pkt, struct  net_device *pnetdev)
 225 {
 226         struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev);
 227         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 228         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 229         s32 res = 0;
 230
 231         RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("+xmit_enry\n"));
 232
 233         if (rtw_if_up(padapter) == false) {
 234                 RT_TRACE(_module_xmit_osdep_c_, _drv_err_, ("rtw_xmit_entry: rtw_if_up fail\n"));
 235                 goto drop_packet;
 236         }
 237
 238         rtw_check_xmit_resource(padapter, pkt);
 239
 240         if (!rtw_mc2u_disable && check_fwstate(pmlmepriv, WIFI_AP_STATE) &&
 241             (IP_MCAST_MAC(pkt->data) || ICMPV6_MCAST_MAC(pkt->data)) &&
 242             (padapter->registrypriv.wifi_spec == 0)) {
 243                 if (pxmitpriv->free_xmitframe_cnt > (NR_XMITFRAME/4)) {
 244                         res = rtw_mlcst2unicst(padapter, pkt);
 245                         if (res)
 246                                 goto exit;
 247                 }
 248         }
 249
 250         res = rtw_xmit(padapter, &pkt);
 251         if (res < 0)
 252                 goto drop_packet;
 253
 254         pxmitpriv->tx_pkts++;
 255         RT_TRACE(_module_xmit_osdep_c_, _drv_info_, ("rtw_xmit_entry: tx_pkts=%d\n", (u32)pxmitpriv->tx_pkts));
 256         goto exit;
 257
 258 drop_packet:
 259         pxmitpriv->tx_drop++;
 260         dev_kfree_skb_any(pkt);
 261         RT_TRACE(_module_xmit_osdep_c_, _drv_notice_, ("rtw_xmit_entry: drop, tx_drop=%d\n", (u32)pxmitpriv->tx_drop));
 262
 263 exit:
 264
 265         return 0;
 266 }