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The LITMUS^RT kernel.

Bjoern Brandenburg

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ion to network taps' href='/cgit/cgit.cgi/litmus-rt-budgetable-locks.git/.git/commit/net/8021q/vlan_core.c?h=update_litmus_2019&id=bc1d0411b804ad190cdadabac48a10067f17b9e6'>bc1d0411b804

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#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/netpoll.h>
#include "vlan.h"

bool vlan_hwaccel_do_receive(struct sk_buff **skbp)
{
	struct sk_buff *skb = *skbp;
	u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
	struct net_device *vlan_dev;
	struct vlan_pcpu_stats *rx_stats;

	vlan_dev = vlan_find_dev(skb->dev, vlan_id);
	if (!vlan_dev) {
		if (vlan_id)
			skb->pkt_type = PACKET_OTHERHOST;
		return false;
	}

	skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
	if (unlikely(!skb))
		return false;

	skb->dev = vlan_dev;
	skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
	skb->vlan_tci = 0;

	rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_pcpu_stats);

	u64_stats_update_begin(&rx_stats->syncp);
	rx_stats->rx_packets++;
	rx_stats->rx_bytes += skb->len;

	switch (skb->pkt_type) {
	case PACKET_BROADCAST:
		break;
	case PACKET_MULTICAST:
		rx_stats->rx_multicast++;
		break;
	case PACKET_OTHERHOST:
		/* Our lower layer thinks this is not local, let's make sure.
		 * This allows the VLAN to have a different MAC than the
		 * underlying device, and still route correctly. */
		if (!compare_ether_addr(eth_hdr(skb)->h_dest,
					vlan_dev->dev_addr))
			skb->pkt_type = PACKET_HOST;
		break;
	}
	u64_stats_update_end(&rx_stats->syncp);

	return true;
}

struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
	return vlan_dev_info(dev)->real_dev;
}
EXPORT_SYMBOL(vlan_dev_real_dev);

u16 vlan_dev_vlan_id(const struct net_device *dev)
{
	return vlan_dev_info(dev)->vlan_id;
}
EXPORT_SYMBOL(vlan_dev_vlan_id);

/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
		      u16 vlan_tci, int polling)
{
	__vlan_hwaccel_put_tag(skb, vlan_tci);
	return polling ? netif_receive_skb(skb) : netif_rx(skb);
}
EXPORT_SYMBOL(__vlan_hwaccel_rx);

gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
			      unsigned int vlan_tci, struct sk_buff *skb)
{
	__vlan_hwaccel_put_tag(skb, vlan_tci);
	return napi_gro_receive(napi, skb);
}
EXPORT_SYMBOL(vlan_gro_receive);

gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
			    unsigned int vlan_tci)
{
	__vlan_hwaccel_put_tag(napi->skb, vlan_tci);
	return napi_gro_frags(napi);
}
EXPORT_SYMBOL(vlan_gro_frags);


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