/*
 *	MPLS GSO Support
 *
 *	Authors: Simon Horman (horms@verge.net.au)
 *
 *	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.
 *
 *	Based on: GSO portions of net/ipv4/gre.c
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/err.h>
#include <linux/module.h>
#include <linux/netdev_features.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>

static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
				       netdev_features_t features)
{
	struct sk_buff *segs = ERR_PTR(-EINVAL);
	u16 mac_offset = skb->mac_header;
	netdev_features_t mpls_features;
	u16 mac_len = skb->mac_len;
	__be16 mpls_protocol;
	unsigned int mpls_hlen;

	skb_reset_network_header(skb);
	mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
	if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
		goto out;

	/* Setup inner SKB. */
	mpls_protocol = skb->protocol;
	skb->protocol = skb->inner_protocol;

	__skb_pull(skb, mpls_hlen);

	skb->mac_len = 0;
	skb_reset_mac_header(skb);

	/* Segment inner packet. */
	mpls_features = skb->dev->mpls_features & features;
	segs = skb_mac_gso_segment(skb, mpls_features);
	if (IS_ERR_OR_NULL(segs)) {
		skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
				     mac_len);
		goto out;
	}
	skb = segs;

	mpls_hlen += mac_len;
	do {
		skb->mac_len = mac_len;
		skb->protocol = mpls_protocol;

		skb_reset_inner_network_header(skb);

		__skb_push(skb, mpls_hlen);

		skb_reset_mac_header(skb);
		skb_set_network_header(skb, mac_len);
	} while ((skb = skb->next));

out:
	return segs;
}

static struct packet_offload mpls_mc_offload __read_mostly = {
	.type = cpu_to_be16(ETH_P_MPLS_MC),
	.priority = 15,
	.callbacks = {
		.gso_segment    =	mpls_gso_segment,
	},
};

static struct packet_offload mpls_uc_offload __read_mostly = {
	.type = cpu_to_be16(ETH_P_MPLS_UC),
	.priority = 15,
	.callbacks = {
		.gso_segment    =	mpls_gso_segment,
	},
};

static int __init mpls_gso_init(void)
{
	pr_info("MPLS GSO support\n");

	dev_add_offload(&mpls_uc_offload);
	dev_add_offload(&mpls_mc_offload);

	return 0;
}

static void __exit mpls_gso_exit(void)
{
	dev_remove_offload(&mpls_uc_offload);
	dev_remove_offload(&mpls_mc_offload);
}

module_init(mpls_gso_init);
module_exit(mpls_gso_exit);

MODULE_DESCRIPTION("MPLS GSO support");
MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
MODULE_LICENSE("GPL");
t name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=1a0bee6c1e788218fd1d141db320db970aace7f0'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=1a0bee6c1e788218fd1d141db320db970aace7f0'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/mac802154?h=nds-private-remove&amp;id=1a0bee6c1e788218fd1d141db320db970aace7f0'>mac802154</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/mac802154/driver-ops.h?h=nds-private-remove&amp;id=1a0bee6c1e788218fd1d141db320db970aace7f0'>driver-ops.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/mac802154/driver-ops.h?h=nds-private-remove&amp;id=1a0bee6c1e788218fd1d141db320db970aace7f0&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>