selftests/bpf: Add bpf_getsockopt() for TCP_BPF_DELACK_MAX and TCP_BPF_RTO_MIN

Add selftests for TCP_BPF_DELACK_MAX and TCP_BPF_RTO_MIN BPF socket
cases.

Signed-off-by: Jason Xing <[email protected]>
Signed-off-by: Martin KaFai Lau <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: JasonXing

tools/testing/selftests/bpf/progs/setget_sockopt.c

@@ -61,6 +61,8 @@ static const struct sockopt_test sol_tcp_tests[] = {
 	{ .opt = TCP_NOTSENT_LOWAT, .new = 1314, .expected = 1314, },
 	{ .opt = TCP_BPF_SOCK_OPS_CB_FLAGS, .new = BPF_SOCK_OPS_ALL_CB_FLAGS,
 	  .expected = BPF_SOCK_OPS_ALL_CB_FLAGS, },
+	{ .opt = TCP_BPF_DELACK_MAX, .new = 30000, .expected = 30000, },
+	{ .opt = TCP_BPF_RTO_MIN, .new = 30000, .expected = 30000, },
 	{ .opt = TCP_RTO_MAX_MS, .new = 2000, .expected = 2000, },
 	{ .opt = 0, },
 };