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packet: Add 'cpu' fanout policy.

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Unfortunately we have to use a real modulus here as
the multiply trick won't work as effectively with cpu
numbers as it does with rxhash values.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-07-06 01:56:38 -07:00
parent 81b16ba2f1
commit 95ec3eb417
2 changed files with 29 additions and 37 deletions
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1
include/linux/if_packet.h
View File

@ -53,6 +53,7 @@ struct sockaddr_ll {
#define PACKET_FANOUT_HASH 0
#define PACKET_FANOUT_LB 1
#define PACKET_FANOUT_CPU 2
#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
struct tpacket_stats {

65
net/packet/af_packet.c
View File

@ -447,6 +447,13 @@ static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb
return f->arr[cur];
}
static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
unsigned int cpu = smp_processor_id();
return f->arr[cpu % num];
}
static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
{
const struct iphdr *iph;
@ -482,8 +489,8 @@ static struct sk_buff *fanout_check_defrag(struct sk_buff *skb)
return skb;
}
static int packet_rcv_fanout_hash(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct packet_fanout *f = pt->af_packet_priv;
unsigned int num = f->num_members;
@ -496,35 +503,25 @@ static int packet_rcv_fanout_hash(struct sk_buff *skb, struct net_device *dev,
return 0;
}
if (f->defrag) {
skb = fanout_check_defrag(skb);
if (!skb)
return 0;
switch (f->type) {
case PACKET_FANOUT_HASH:
default:
if (f->defrag) {
skb = fanout_check_defrag(skb);
if (!skb)
return 0;
}
skb_get_rxhash(skb);
sk = fanout_demux_hash(f, skb, num);
break;
case PACKET_FANOUT_LB:
sk = fanout_demux_lb(f, skb, num);
break;
case PACKET_FANOUT_CPU:
sk = fanout_demux_cpu(f, skb, num);
break;
}
skb_get_rxhash(skb);
sk = fanout_demux_hash(f, skb, num);
po = pkt_sk(sk);
return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
}
static int packet_rcv_fanout_lb(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct packet_fanout *f = pt->af_packet_priv;
unsigned int num = f->num_members;
struct packet_sock *po;
struct sock *sk;
if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
!num) {
kfree_skb(skb);
return 0;
}
sk = fanout_demux_lb(f, skb, num);
po = pkt_sk(sk);
return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
@ -571,6 +568,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
switch (type) {
case PACKET_FANOUT_HASH:
case PACKET_FANOUT_LB:
case PACKET_FANOUT_CPU:
break;
default:
return -EINVAL;
@ -606,14 +604,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
atomic_set(&match->sk_ref, 0);
match->prot_hook.type = po->prot_hook.type;
match->prot_hook.dev = po->prot_hook.dev;
switch (type) {
case PACKET_FANOUT_HASH:
match->prot_hook.func = packet_rcv_fanout_hash;
break;
case PACKET_FANOUT_LB:
match->prot_hook.func = packet_rcv_fanout_lb;
break;
}
match->prot_hook.func = packet_rcv_fanout;
match->prot_hook.af_packet_priv = match;
dev_add_pack(&match->prot_hook);
list_add(&match->list, &fanout_list);