diff options
Diffstat (limited to 'target/linux/ar71xx/files')
| -rw-r--r-- | target/linux/ar71xx/files/net/dsa/tag_qinq.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/net/dsa/tag_qinq.c b/target/linux/ar71xx/files/net/dsa/tag_qinq.c new file mode 100644 index 0000000000..68bcc38287 --- /dev/null +++ b/target/linux/ar71xx/files/net/dsa/tag_qinq.c @@ -0,0 +1,127 @@ +/* + * net/dsa/tag_qinq.c - QinQ tag format handling + * Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org> + * + * This file was based on: + * net/dsa/tag_edsa.c - Ethertype DSA tagging + * Copyright (c) 2008-2009 Marvell Semiconductor + * + * This program 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. + */ + +#include <linux/etherdevice.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/if_vlan.h> + +#include "dsa_priv.h" + +netdev_tx_t qinq_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct dsa_slave_priv *p = netdev_priv(dev); + struct vlan_ethhdr *veth; + unsigned int len; + int ret; + + if (skb_cow_head(skb, VLAN_HLEN) < 0) + goto out_free_skb; + + veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN); + + /* Move the mac addresses to the beginning of the new header. */ + memmove(skb->data, skb->data + VLAN_HLEN, 2 * VLAN_ETH_ALEN); + skb->mac_header -= VLAN_HLEN; + + /* setup VLAN header fields */ + veth->h_vlan_proto = htons(ETH_P_QINQ); + veth->h_vlan_TCI = htons(p->port); + + len = skb->len; + skb->protocol = htons(ETH_P_QINQ); + skb->dev = p->parent->dst->master_netdev; + + ret = dev_queue_xmit(skb); + if (unlikely(ret != NET_XMIT_SUCCESS)) + goto out_dropped; + + dev->stats.tx_packets++; + dev->stats.tx_bytes += len; + + return NETDEV_TX_OK; + + out_free_skb: + kfree_skb(skb); + out_dropped: + dev->stats.tx_dropped++; + return NETDEV_TX_OK; +} + +static int qinq_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct dsa_switch_tree *dst; + struct dsa_switch *ds; + struct vlan_hdr *vhdr; + int source_port; + + dst = dev->dsa_ptr; + if (unlikely(dst == NULL)) + goto out_drop; + ds = dst->ds[0]; + + skb = skb_unshare(skb, GFP_ATOMIC); + if (skb == NULL) + goto out; + + if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) + goto out_drop; + + vhdr = (struct vlan_hdr *)skb->data; + source_port = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK; + if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL) + goto out_drop; + + /* Remove the outermost VLAN tag and update checksum. */ + skb_pull_rcsum(skb, VLAN_HLEN); + memmove(skb->data - ETH_HLEN, + skb->data - ETH_HLEN - VLAN_HLEN, + 2 * ETH_ALEN); + + skb->dev = ds->ports[source_port]; + skb_push(skb, ETH_HLEN); + skb->pkt_type = PACKET_HOST; + skb->protocol = eth_type_trans(skb, skb->dev); + + skb->dev->stats.rx_packets++; + skb->dev->stats.rx_bytes += skb->len; + + netif_receive_skb(skb); + + return 0; + + out_drop: + kfree_skb(skb); + out: + return 0; +} + +static struct packet_type qinq_packet_type __read_mostly = { + .type = cpu_to_be16(ETH_P_QINQ), + .func = qinq_rcv, +}; + +static int __init qinq_init_module(void) +{ + dev_add_pack(&qinq_packet_type); + return 0; +} +module_init(qinq_init_module); + +static void __exit qinq_cleanup_module(void) +{ + dev_remove_pack(&qinq_packet_type); +} +module_exit(qinq_cleanup_module); |