mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
bdef7de4b8
When we scan a packet for GRO processing, we want to see the most common packet types in the front of the offload_base list. So add a priority field so we can handle this properly. IPv4/IPv6 get the highest priority with the implicit zero priority field. Next comes ethernet with a priority of 10, and then we have the MPLS types with a priority of 15. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Suggested-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
|
|
* 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);
|
|
netdev_features_t mpls_features;
|
|
__be16 mpls_protocol;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_type &
|
|
~(SKB_GSO_TCPV4 |
|
|
SKB_GSO_TCPV6 |
|
|
SKB_GSO_UDP |
|
|
SKB_GSO_DODGY |
|
|
SKB_GSO_TCP_ECN)))
|
|
goto out;
|
|
|
|
/* Setup inner SKB. */
|
|
mpls_protocol = skb->protocol;
|
|
skb->protocol = skb->inner_protocol;
|
|
|
|
/* Push back the mac header that skb_mac_gso_segment() has pulled.
|
|
* It will be re-pulled by the call to skb_mac_gso_segment() below
|
|
*/
|
|
__skb_push(skb, skb->mac_len);
|
|
|
|
/* Segment inner packet. */
|
|
mpls_features = skb->dev->mpls_features & features;
|
|
segs = skb_mac_gso_segment(skb, mpls_features);
|
|
|
|
|
|
/* Restore outer protocol. */
|
|
skb->protocol = mpls_protocol;
|
|
|
|
/* Re-pull the mac header that the call to skb_mac_gso_segment()
|
|
* above pulled. It will be re-pushed after returning
|
|
* skb_mac_gso_segment(), an indirect caller of this function.
|
|
*/
|
|
__skb_pull(skb, skb->data - skb_mac_header(skb));
|
|
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");
|