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selftests/bpf: use __bpf_constant_htons in test_prog.c 

For some reason, my older GCC (< 4.8) isn't smart enough to optimize the
!__builtin_constant_p() branch in bpf_htons, I see:
  error: implicit declaration of function '__builtin_bswap16'

Let's use __bpf_constant_htons as suggested by Daniel Borkmann.

I tried to use simple htons, but it produces the following:
  test_progs.c:54:17: error: braced-group within expression allowed only
  inside a function
    .eth.h_proto = htons(ETH_P_IP),

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Stanislav Fomichev 2018-12-11 19:20:52 -08:00 committed by Alexei Starovoitov
parent 37ab566c17
commit a0517a0f7e
1 changed files with 4 additions and 4 deletions
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8
tools/testing/selftests/bpf/test_progs.c
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@ -51,10 +51,10 @@ static struct {
struct iphdr iph;
struct tcphdr tcp;
} __packed pkt_v4 = {
.eth.h_proto = bpf_htons(ETH_P_IP),
.eth.h_proto = __bpf_constant_htons(ETH_P_IP),
.iph.ihl = 5,
.iph.protocol = 6,
.iph.tot_len = bpf_htons(MAGIC_BYTES),
.iph.tot_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
};
@ -64,9 +64,9 @@ static struct {
struct ipv6hdr iph;
struct tcphdr tcp;
} __packed pkt_v6 = {
.eth.h_proto = bpf_htons(ETH_P_IPV6),
.eth.h_proto = __bpf_constant_htons(ETH_P_IPV6),
.iph.nexthdr = 6,
.iph.payload_len = bpf_htons(MAGIC_BYTES),
.iph.payload_len = __bpf_constant_htons(MAGIC_BYTES),
.tcp.urg_ptr = 123,
};