From: Stanislav Fomichev <sdf@google.com>
Date: Tue, 15 Oct 2019 11:31:25 -0700
Subject: selftests: bpf: Add selftest for __sk_buff tstamp
Patch-mainline: v5.5-rc1
Git-commit: 95fbda1e37384b9c270218b52718c83ddf4bb34e
References: bsc#1177028

Make sure BPF_PROG_TEST_RUN accepts tstamp and exports any
modifications that BPF program does.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191015183125.124413-2-sdf@google.com
Acked-by: Gary Lin <glin@suse.com>
---
 tools/testing/selftests/bpf/prog_tests/skb_ctx.c |    5 +++++
 tools/testing/selftests/bpf/progs/test_skb_ctx.c |    1 +
 2 files changed, 6 insertions(+)

--- a/tools/testing/selftests/bpf/prog_tests/skb_ctx.c
+++ b/tools/testing/selftests/bpf/prog_tests/skb_ctx.c
@@ -10,6 +10,7 @@ void test_skb_ctx(void)
 		.cb[3] = 4,
 		.cb[4] = 5,
 		.priority = 6,
+		.tstamp = 7,
 	};
 	struct bpf_prog_test_run_attr tattr = {
 		.data_in = &pkt_v4,
@@ -86,4 +87,8 @@ void test_skb_ctx(void)
 		   "ctx_out_priority",
 		   "skb->priority == %d, expected %d\n",
 		   skb.priority, 7);
+	CHECK_ATTR(skb.tstamp != 8,
+		   "ctx_out_tstamp",
+		   "skb->tstamp == %lld, expected %d\n",
+		   skb.tstamp, 8);
 }
--- a/tools/testing/selftests/bpf/progs/test_skb_ctx.c
+++ b/tools/testing/selftests/bpf/progs/test_skb_ctx.c
@@ -16,6 +16,7 @@ int process(struct __sk_buff *skb)
 		skb->cb[i]++;
 	}
 	skb->priority++;
+	skb->tstamp++;
 
 	return 0;
 }