net/atm/raw.c

   1 /* net/atm/raw.c - Raw AAL0 and AAL5 transports */
   2
   3 /* Written 1995-1999 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6 #include <linux/config.h>
   7 #include <linux/module.h>
   8 #include <linux/sched.h>
   9 #include <linux/atmdev.h>
  10 #include <linux/kernel.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/mm.h>
  13
  14 #ifdef CONFIG_MMU_HACKS
  15 #include <linux/mmuio.h>
  16 #include <linux/uio.h>
  17 #endif
  18
  19 #include "common.h"
  20 #include "protocols.h"
  21 #include "tunable.h"            /* tunable parameters */
  22
  23
  24 #if 0
  25 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  26 #else
  27 #define DPRINTK(format,args...)
  28 #endif
  29
  30
  31 /*
  32  * SKB == NULL indicates that the link is being closed
  33  */
  34
  35 void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  36 {
  37         if (skb) {
  38                 skb_queue_tail(&vcc->recvq,skb);
  39                 wake_up(&vcc->sleep);
  40         }
  41 }
  42
  43
  44 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  45 {
  46 #ifdef CONFIG_MMU_HACKS
  47         if (ATM_SKB(skb)->iovcnt)
  48                 unlock_user(ATM_SKB(skb)->iovcnt,(struct iovec *) skb->data);
  49 #endif
  50         DPRINTK("APopR (%d) %d -= %d\n",vcc->vci,vcc->tx_inuse,skb->truesize);
  51         atomic_sub(skb->truesize+ATM_PDU_OVHD,&vcc->tx_inuse);
  52         dev_kfree_skb(skb);
  53         wake_up(&vcc->wsleep);
  54 }
  55
  56
  57 int atm_init_aal0(struct atm_vcc *vcc)
  58 {
  59         vcc->push = atm_push_raw;
  60         vcc->pop = atm_pop_raw;
  61         vcc->push_oam = NULL;
  62         return 0;
  63 }
  64
  65
  66 int atm_init_aal34(struct atm_vcc *vcc)
  67 {
  68         vcc->push = atm_push_raw;
  69         vcc->pop = atm_pop_raw;
  70         vcc->push_oam = NULL;
  71         return 0;
  72 }
  73
  74
  75 int atm_init_aal5(struct atm_vcc *vcc)
  76 {
  77         vcc->push = atm_push_raw;
  78         vcc->pop = atm_pop_raw;
  79         vcc->push_oam = NULL;
  80         return 0;
  81 }
  82
  83
  84 EXPORT_SYMBOL(atm_init_aal5);