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net: Add generic packet offload infrastructure.

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Create a new data structure to contain the GRO/GSO callbacks and add
a new registration mechanism.

Singed-off-by: Vlad Yasevich <vyasevic@redhat.com>

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2012-11-15 08:49:10 +00:00 committed by David S. Miller
parent efad0c14b7
commit 62532da9d5
2 changed files with 94 additions and 0 deletions
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14
include/linux/netdevice.h
View file

@ -1521,6 +1521,17 @@ struct packet_type {
struct list_head list;
};
struct packet_offload {
__be16 type; /* This is really htons(ether_type). */
struct sk_buff *(*gso_segment)(struct sk_buff *skb,
netdev_features_t features);
int (*gso_send_check)(struct sk_buff *skb);
struct sk_buff **(*gro_receive)(struct sk_buff **head,
struct sk_buff *skb);
int (*gro_complete)(struct sk_buff *skb);
struct list_head list;
};
#include <linux/notifier.h>
/* netdevice notifier chain. Please remember to update the rtnetlink
@ -1615,6 +1626,9 @@ extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short
extern void dev_add_pack(struct packet_type *pt);
extern void dev_remove_pack(struct packet_type *pt);
extern void __dev_remove_pack(struct packet_type *pt);
extern void dev_add_offload(struct packet_offload *po);
extern void dev_remove_offload(struct packet_offload *po);
extern void __dev_remove_offload(struct packet_offload *po);
extern struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
unsigned short mask);

80
net/core/dev.c
View file

@ -176,8 +176,10 @@
#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
static DEFINE_SPINLOCK(ptype_lock);
static DEFINE_SPINLOCK(offload_lock);
static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
static struct list_head ptype_all __read_mostly; /* Taps */
static struct list_head offload_base __read_mostly;
/*
* The @dev_base_head list is protected by @dev_base_lock and the rtnl
@ -470,6 +472,82 @@ void dev_remove_pack(struct packet_type *pt)
}
EXPORT_SYMBOL(dev_remove_pack);
/**
* dev_add_offload - register offload handlers
* @po: protocol offload declaration
*
* Add protocol offload handlers to the networking stack. The passed
* &proto_offload is linked into kernel lists and may not be freed until
* it has been removed from the kernel lists.
*
* This call does not sleep therefore it can not
* guarantee all CPU's that are in middle of receiving packets
* will see the new offload handlers (until the next received packet).
*/
void dev_add_offload(struct packet_offload *po)
{
struct list_head *head = &offload_base;
spin_lock(&offload_lock);
list_add_rcu(&po->list, head);
spin_unlock(&offload_lock);
}
EXPORT_SYMBOL(dev_add_offload);
/**
* __dev_remove_offload - remove offload handler
* @po: packet offload declaration
*
* Remove a protocol offload handler that was previously added to the
* kernel offload handlers by dev_add_offload(). The passed &offload_type
* is removed from the kernel lists and can be freed or reused once this
* function returns.
*
* The packet type might still be in use by receivers
* and must not be freed until after all the CPU's have gone
* through a quiescent state.
*/
void __dev_remove_offload(struct packet_offload *po)
{
struct list_head *head = &offload_base;
struct packet_offload *po1;
spin_lock(&ptype_lock);
list_for_each_entry(po1, head, list) {
if (po == po1) {
list_del_rcu(&po->list);
goto out;
}
}
pr_warn("dev_remove_offload: %p not found\n", po);
out:
spin_unlock(&ptype_lock);
}
EXPORT_SYMBOL(__dev_remove_offload);
/**
* dev_remove_offload - remove packet offload handler
* @po: packet offload declaration
*
* Remove a packet offload handler that was previously added to the kernel
* offload handlers by dev_add_offload(). The passed &offload_type is
* removed from the kernel lists and can be freed or reused once this
* function returns.
*
* This call sleeps to guarantee that no CPU is looking at the packet
* type after return.
*/
void dev_remove_offload(struct packet_offload *po)
{
__dev_remove_offload(po);
synchronize_net();
}
EXPORT_SYMBOL(dev_remove_offload);
/******************************************************************************
Device Boot-time Settings Routines
@ -6661,6 +6739,8 @@ static int __init net_dev_init(void)
for (i = 0; i < PTYPE_HASH_SIZE; i++)
INIT_LIST_HEAD(&ptype_base[i]);
INIT_LIST_HEAD(&offload_base);
if (register_pernet_subsys(&netdev_net_ops))
goto out;