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Commit da2033c2 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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filter: add SKF_AD_RXHASH and SKF_AD_CPU 



Add SKF_AD_RXHASH and SKF_AD_CPU to filter ancillary mechanism,
to be able to build advanced filters.

This can help spreading packets on several sockets with a fast
selection, after RPS dispatch to N cpus for example, or to catch a
percentage of flows in one queue.

tcpdump -s 500 "cpu = 1" :

[0] ld CPU
[1] jeq #1  jt 2  jf 3
[2] ret #500
[3] ret #0

# take 12.5 % of flows (average)
tcpdump -s 1000 "rxhash & 7 = 2" :

[0] ld RXHASH
[1] and #7
[2] jeq #2  jt 3  jf 4
[3] ret #1000
[4] ret #0

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Cc: Rui <wirelesser@gmail.com>
Acked-by: default avatarChangli Gao <xiaosuo@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 539995d1

include/linux/filter.h

+3 −1
Original line number Diff line number Diff line
@@ -124,7 +124,9 @@ struct sock_fprog { /* Required for SO_ATTACH_FILTER. */ 
#define SKF_AD_MARK 	20

#define SKF_AD_QUEUE	24

#define SKF_AD_HATYPE	28

#define SKF_AD_MAX	32

#define SKF_AD_RXHASH	32

#define SKF_AD_CPU	36

#define SKF_AD_MAX	40

#define SKF_NET_OFF   (-0x100000)

#define SKF_LL_OFF    (-0x200000)

net/core/filter.c

+6 −0
Original line number Diff line number Diff line
@@ -375,6 +375,12 @@ unsigned int sk_run_filter(struct sk_buff *skb, const struct sock_filter *fentry 
				return 0;

			A = skb->dev->type;

			continue;

		case SKF_AD_RXHASH:

			A = skb->rxhash;

			continue;

		case SKF_AD_CPU:

			A = raw_smp_processor_id();

			continue;

		case SKF_AD_NLATTR: {

			struct nlattr *nla;