netdev - [PATCH bpf-next] selftests/bpf: use __bpf_constant_htons in test

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Message-Id: <20190227191511.80859-1-sdf@google.com>
Date:   Wed, 27 Feb 2019 11:15:11 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next] selftests/bpf: use __bpf_constant_htons in
 test_prog.c for flow dissector

Older GCC (<4.8) isn't smart enough to optimize !__builtin_constant_p()
branch in bpf_htons.

I recently fixed it for pkt_v4 and pkt_v6 in commit a0517a0f7ef23
("selftests/bpf: use __bpf_constant_htons in test_prog.c"), but later
added another bunch of bpf_htons in commit bf0f0fd939451 ("selftests/bpf:
add simple BPF_PROG_TEST_RUN examples for flow dissector").

Fixes: bf0f0fd939451 ("selftests/bpf: add simple BPF_PROG_TEST_RUN examples for flow dissector")

Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 tools/testing/selftests/bpf/test_progs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index c59d2e015d16..87cde42559f7 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -1954,7 +1954,7 @@ static struct bpf_flow_keys pkt_v4_flow_keys = {
 	.thoff = sizeof(struct iphdr),
 	.addr_proto = ETH_P_IP,
 	.ip_proto = IPPROTO_TCP,
-	.n_proto = bpf_htons(ETH_P_IP),
+	.n_proto = __bpf_constant_htons(ETH_P_IP),
 };
 
 static struct bpf_flow_keys pkt_v6_flow_keys = {
@@ -1962,7 +1962,7 @@ static struct bpf_flow_keys pkt_v6_flow_keys = {
 	.thoff = sizeof(struct ipv6hdr),
 	.addr_proto = ETH_P_IPV6,
 	.ip_proto = IPPROTO_TCP,
-	.n_proto = bpf_htons(ETH_P_IPV6),
+	.n_proto = __bpf_constant_htons(ETH_P_IPV6),
 };
 
 static void test_flow_dissector(void)
-- 
2.21.0.rc2.261.ga7da99ff1b-goog