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net: ptp: do not reimplement PTP/BPF classifier

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There are currently pch_gbe, cpts, and ixp4xx_eth drivers that open-code
and reimplement a BPF classifier for the PTP protocol. Since all of them
effectively do the very same thing and load the very same PTP/BPF filter,
we can just consolidate that code by introducing ptp_classify_raw() in
the time-stamping core framework which can be used in drivers.

As drivers get initialized after bootstrapping the core networking
subsystem, they can make use of ptp_insns wrapped through
ptp_classify_raw(), which allows to simplify and remove PTP classifier
setup code in drivers.

Joint work with Alexei Starovoitov.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Richard Cochran <richard.cochran@omicron.at>
Cc: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-03-28 18:58:22 +01:00 • committed by David S. Miller
parent e62d2df084
commit 164d8c6665
5 changed files with 12 additions and 38 deletions
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10
include/linux/ptp_classify.h
View file

@ -80,14 +80,6 @@
#define OP_RETA (BPF_RET | BPF_A)
#define OP_RETK (BPF_RET | BPF_K)
static inline int ptp_filter_init(struct sock_filter *f, int len)
{
if (OP_LDH == f[0].code)
return sk_chk_filter(f, len);
else
return 0;
}
#define PTP_FILTER \
{OP_LDH, 0, 0, OFF_ETYPE }, /* */ \
{OP_JEQ, 0, 12, ETH_P_IP }, /* f goto L20 */ \
@ -133,4 +125,6 @@ static inline int ptp_filter_init(struct sock_filter *f, int len)
{OP_RETA, 0, 0, 0 }, /* */ \
/*L6x*/ {OP_RETK, 0, 0, PTP_CLASS_NONE },
unsigned int ptp_classify_raw(const struct sk_buff *skb);
#endif