--- zzzz-none-000/linux-2.4.17/net/atm/raw.c	2000-04-14 16:37:20.000000000 +0000
+++ sangam-fb-401/linux-2.4.17/net/atm/raw.c	2005-06-14 11:09:35.000000000 +0000
@@ -27,9 +27,66 @@
 
 void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
 {
+	struct tpacket_hdr *h;
 	if (skb) {
+#ifndef CONFIG_PACKET_MMAP
 		skb_queue_tail(&vcc->recvq,skb);
 		wake_up(&vcc->sleep);
+#else
+	   if (vcc->iovec == 0) {
+		  skb_queue_tail(&vcc->recvq,skb);
+		  wake_up(&vcc->sleep);
+	   } else {
+	      unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
+	      unsigned short off = TPACKET_ALIGN(TPACKET_HDRLEN) + 16;
+	      unsigned snaplen = skb->len;
+		  
+	      spin_lock(&vcc->recvq.lock);
+	      h = vcc->iovec[vcc->head];
+	      if (h->tp_status) {
+	         spin_unlock(&vcc->recvq.lock);
+	         atomic_inc(&vcc->stats->rx_drop);
+		     goto ring_is_full;
+		  }
+	      vcc->head = vcc->head != vcc->iovmax ? vcc->head+1 : 0;
+	      spin_unlock(&vcc->recvq.lock);
+
+	      if (off + snaplen > vcc->frame_size) {
+		     snaplen = vcc->frame_size - off;
+		     if ((int)snaplen < 0)
+			    snaplen = 0;
+	      }
+
+	      memcpy((u8*)h + off, skb->data, snaplen);
+
+	      h->tp_len = skb->len;
+	      h->tp_snaplen = snaplen;
+	      h->tp_mac = off;
+	      h->tp_net = off;
+	      h->tp_sec = skb->stamp.tv_sec;
+	      h->tp_usec = skb->stamp.tv_usec;
+
+		  h->tp_status = status;
+		  mb();
+
+		  {
+			  struct page *p_start, *p_end;
+			  u8 *h_end = (u8 *)h + off + snaplen - 1;
+
+			  p_start = virt_to_page(h);
+			  p_end = virt_to_page(h_end);
+			  while (p_start <= p_end) {
+				  flush_dcache_page(p_start);
+				  p_start++;
+			  }
+		  }
+		  wake_up(&vcc->sleep);
+
+ring_is_full:
+	      atm_return(vcc,skb->truesize);
+	      dev_kfree_skb_any(skb);
+	   }
+#endif
 	}
 }