/*
 *	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");
/option>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=e5fbd977641c92a3a2b559bb5ebb425458e3efe8'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=e5fbd977641c92a3a2b559bb5ebb425458e3efe8'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv4?h=nds-private-remove&amp;id=e5fbd977641c92a3a2b559bb5ebb425458e3efe8'>ipv4</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/ipv4/tcp_recovery.c?h=nds-private-remove&amp;id=e5fbd977641c92a3a2b559bb5ebb425458e3efe8'>tcp_recovery.c</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/ipv4/tcp_recovery.c?h=nds-private-remove&amp;id=e5fbd977641c92a3a2b559bb5ebb425458e3efe8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
alue='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Jacob Keller &lt;jacob.e.keller@intel.com&gt;</td><td class='right'>2017-02-09 23:29:13 -0800</td></tr>
<tr><th>committer</th><td>Jeff Kirsher &lt;jeffrey.t.kirsher@intel.com&gt;</td><td class='right'>2017-02-11 20:39:00 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=d7ce6422d6e64502d9f6acff9a4466e2ddb64721'>d7ce6422d6e64502d9f6acff9a4466e2ddb64721</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=d7ce6422d6e64502d9f6acff9a4466e2ddb64721'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=d7ce6422d6e64502d9f6acff9a4466e2ddb64721'>ee68e4f84066c2abc16e144b72d7845b9091afb1</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=1bf960502e4c94425c3a3a985200834fb59839c6'>1bf960502e4c94425c3a3a985200834fb59839c6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=d7ce6422d6e64502d9f6acff9a4466e2ddb64721&amp;id2=1bf960502e4c94425c3a3a985200834fb59839c6'>diff</a>)</td></tr></table>
<div class='commit-subject'>i40e: don't check params until after checking for client instance</div><div class='commit-msg'>We can avoid the minor bit of work by calling check params after we
check for the client instance, since we're about to return early in
cases where we do not have a client.

Change-ID: I56f8ea2ba48d4f571fa331c9ace50819a022fa1c
Signed-off-by: Jacob Keller &lt;jacob.e.keller@intel.com&gt;
Tested-by: Andrew Bowers &lt;andrewx.bowers@intel.com&gt;
Signed-off-by: Jeff Kirsher &lt;jeffrey.t.kirsher@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=d7ce6422d6e64502d9f6acff9a4466e2ddb64721'>Diffstat</a></div><table summary='diffstat' class='diffstat'>