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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [net/] [rose/] [rose_out.c] - Rev 1765
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/* * ROSE release 003 * * This code REQUIRES 2.1.0 or higher/ NET3.029 * * This module: * This module is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * History * ROSE 001 Jonathan(G4KLX) Cloned from nr_out.c */ #include <linux/config.h> #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE) #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <net/ax25.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <net/sock.h> #include <asm/segment.h> #include <asm/system.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <net/rose.h> /* * This procedure is passed a buffer descriptor for an iframe. It builds * the rest of the control part of the frame and then writes it out. */ static void rose_send_iframe(struct sock *sk, struct sk_buff *skb) { if (skb == NULL) return; skb->data[2] |= (sk->protinfo.rose->vr << 5) & 0xE0; skb->data[2] |= (sk->protinfo.rose->vs << 1) & 0x0E; rose_transmit_link(skb, sk->protinfo.rose->neighbour); } void rose_kick(struct sock *sk) { struct sk_buff *skb, *skbn; unsigned short start, end; if (sk->protinfo.rose->state != ROSE_STATE_3) return; if (sk->protinfo.rose->condition & ROSE_COND_PEER_RX_BUSY) return; if (skb_peek(&sk->write_queue) == NULL) return; start = (skb_peek(&sk->protinfo.rose->ack_queue) == NULL) ? sk->protinfo.rose->va : sk->protinfo.rose->vs; end = (sk->protinfo.rose->va + sysctl_rose_window_size) % ROSE_MODULUS; if (start == end) return; sk->protinfo.rose->vs = start; /* * Transmit data until either we're out of data to send or * the window is full. */ skb = skb_dequeue(&sk->write_queue); do { if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { skb_queue_head(&sk->write_queue, skb); break; } /* * Transmit the frame copy. */ rose_send_iframe(sk, skbn); sk->protinfo.rose->vs = (sk->protinfo.rose->vs + 1) % ROSE_MODULUS; /* * Requeue the original data frame. */ skb_queue_tail(&sk->protinfo.rose->ack_queue, skb); } while (sk->protinfo.rose->vs != end && (skb = skb_dequeue(&sk->write_queue)) != NULL); sk->protinfo.rose->vl = sk->protinfo.rose->vr; sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING; sk->protinfo.rose->timer = 0; } /* * The following routines are taken from page 170 of the 7th ARRL Computer * Networking Conference paper, as is the whole state machine. */ void rose_enquiry_response(struct sock *sk) { if (sk->protinfo.rose->condition & ROSE_COND_OWN_RX_BUSY) rose_write_internal(sk, ROSE_RNR); else rose_write_internal(sk, ROSE_RR); sk->protinfo.rose->vl = sk->protinfo.rose->vr; sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING; sk->protinfo.rose->timer = 0; } #endif