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authorAlexei Starovoitov <ast@plumgrid.com>2015-09-16 09:05:43 +0300
committerDavid S. Miller <davem@davemloft.net>2015-09-18 07:09:07 +0300
commit27b29f63058d26c6c1742f1993338280d5a41dc6 (patch)
tree4a74088c6a959041fd267fcf03466ca7eea355e1 /net/core/dev.c
parent045efa82ff563cd4e656ca1c2e354fa5bf6bbda4 (diff)
downloadlinux-27b29f63058d26c6c1742f1993338280d5a41dc6.tar.xz
bpf: add bpf_redirect() helper
Existing bpf_clone_redirect() helper clones skb before redirecting it to RX or TX of destination netdev. Introduce bpf_redirect() helper that does that without cloning. Benchmarked with two hosts using 10G ixgbe NICs. One host is doing line rate pktgen. Another host is configured as: $ tc qdisc add dev $dev ingress $ tc filter add dev $dev root pref 10 u32 match u32 0 0 flowid 1:2 \ action bpf run object-file tcbpf1_kern.o section clone_redirect_xmit drop so it receives the packet on $dev and immediately xmits it on $dev + 1 The section 'clone_redirect_xmit' in tcbpf1_kern.o file has the program that does bpf_clone_redirect() and performance is 2.0 Mpps $ tc filter add dev $dev root pref 10 u32 match u32 0 0 flowid 1:2 \ action bpf run object-file tcbpf1_kern.o section redirect_xmit drop which is using bpf_redirect() - 2.4 Mpps and using cls_bpf with integrated actions as: $ tc filter add dev $dev root pref 10 \ bpf run object-file tcbpf1_kern.o section redirect_xmit integ_act classid 1 performance is 2.5 Mpps To summarize: u32+act_bpf using clone_redirect - 2.0 Mpps u32+act_bpf using redirect - 2.4 Mpps cls_bpf using redirect - 2.5 Mpps For comparison linux bridge in this setup is doing 2.1 Mpps and ixgbe rx + drop in ip_rcv - 7.8 Mpps Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 00dccfac8939..ee0d6286f934 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3670,6 +3670,14 @@ static inline struct sk_buff *handle_ing(struct sk_buff *skb,
case TC_ACT_QUEUED:
kfree_skb(skb);
return NULL;
+ case TC_ACT_REDIRECT:
+ /* skb_mac_header check was done by cls/act_bpf, so
+ * we can safely push the L2 header back before
+ * redirecting to another netdev
+ */
+ __skb_push(skb, skb->mac_len);
+ skb_do_redirect(skb);
+ return NULL;
default:
break;
}