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net: sched: consolidate tc_classify{,_compat}

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For classifiers getting invoked via tc_classify(), we always need an
extra function call into tc_classify_compat(), as both are being
exported as symbols and tc_classify() itself doesn't do much except
handling of reclassifications when tp->classify() returned with
TC_ACT_RECLASSIFY.

CBQ and ATM are the only qdiscs that directly call into tc_classify_compat(),
all others use tc_classify(). When tc actions are being configured
out in the kernel, tc_classify() effectively does nothing besides
delegating.

We could spare this layer and consolidate both functions. pktgen on
single CPU constantly pushing skbs directly into the netif_receive_skb()
path with a dummy classifier on ingress qdisc attached, improves
slightly from 22.3Mpps to 23.1Mpps.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-08-26 23:00:06 +02:00 • committed by David S. Miller
parent fe2188236a
commit 3b3ae88026
16 changed files with 40 additions and 47 deletions
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4
include/net/pkt_sched.h
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@ -110,10 +110,8 @@ static inline void qdisc_run(struct Qdisc *q)
__qdisc_run(q);
}
int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
struct tcf_result *res, bool compat_mode);
static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
{