d5518aa938
The MTU can be set via the "mtu" attribute like follows. <vfs> <lxip mtu="1200" dhcp="yes"/> </vfs>
141 lines
2.6 KiB
C
141 lines
2.6 KiB
C
/*
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* \brief Back-end driver for IP stack
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* \author Sebastian Sumpf
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* \author Stefan Kalkowski
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* \date 2013-09-04
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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/* Linux includes */
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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/* local includes */
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#include <lx_emul.h>
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#include <nic.h>
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static struct net_device *_dev;
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static int driver_net_open(struct net_device *dev)
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{
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_dev = dev;
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return 0;
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}
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static int driver_net_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct net_device_stats *stats = (struct net_device_stats*) netdev_priv(dev);
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int len = skb->len;
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void* addr = skb->data;
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/* transmit to nic-session */
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if (net_tx(addr, len)) {
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/* tx queue is full, could not enqueue packet */
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pr_debug("TX packet dropped\n");
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return NETDEV_TX_BUSY;
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}
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dev_kfree_skb(skb);
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/* save timestamp */
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dev->trans_start = jiffies;
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stats->tx_packets++;
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stats->tx_bytes += len;
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return NETDEV_TX_OK;
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}
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static int driver_change_mtu(struct net_device *dev, int new_mtu)
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{
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/* possible point to reflect successful MTU setting */
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return eth_change_mtu(dev, new_mtu);
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}
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static const struct net_device_ops driver_net_ops =
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{
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.ndo_open = driver_net_open,
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.ndo_start_xmit = driver_net_xmit,
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.ndo_change_mtu = driver_change_mtu,
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};
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static int driver_init(void)
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{
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struct net_device *dev;
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int err = -ENODEV;
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dev = alloc_etherdev(0);
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if (!(dev = alloc_etherdev(0)))
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goto out;
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dev->netdev_ops = &driver_net_ops;
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/* set MAC */
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net_mac(dev->dev_addr, ETH_ALEN);
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if ((err = register_netdev(dev))) {
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panic("driver: Could not register back-end %d\n", err);
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goto out_free;
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}
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return 0;
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out_free:
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free_netdev(dev);
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out:
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return err;
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}
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module_init(driver_init);
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/**
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* Called by Nic_client when a packet was received
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*/
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void net_driver_rx(void *addr, unsigned long size)
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{
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struct net_device_stats *stats;
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if (!_dev)
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return;
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stats = (struct net_device_stats*) netdev_priv(_dev);
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/* allocate skb */
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enum {
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ADDITIONAL_HEADROOM = 4, /* smallest value found by trial & error */
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};
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struct sk_buff *skb = dev_alloc_skb(size + ADDITIONAL_HEADROOM);
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if (!skb) {
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printk(KERN_NOTICE "genode_net_rx: low on mem - packet dropped!\n");
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stats->rx_dropped++;
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return;
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}
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/* copy packet */
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memcpy(skb_put(skb, size), addr, size);
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skb->dev = _dev;
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skb->protocol = eth_type_trans(skb, _dev);
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skb->ip_summed = CHECKSUM_NONE;
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netif_receive_skb(skb);
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stats->rx_packets++;
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stats->rx_bytes += size;
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}
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