bpf: Simplify insn rewrite on BPF_READ __sk_buff->tstamp

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The skb->tc_at_ingress and skb->mono_delivery_time are at the same
byte offset.  Thus, only one BPF_LDX_MEM(BPF_B) is needed
and both bits can be tested together.

/* BPF_READ: a = __sk_buff->tstamp */
if (skb->tc_at_ingress && skb->mono_delivery_time)
	a = 0;
else
	a = skb->tstamp;

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220309090456.3711530-1-kafai@fb.com

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Martin KaFai Lau 2022-03-09 01:04:56 -08:00 • committed by Daniel Borkmann

parent 3b5d4ddf8f

commit 539de9328e

1 changed files with 11 additions and 10 deletions

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net/core/filter.c

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