tools/tcpstates: remove unnecessary checking of TCP

tools/tcpstates.py

@@ -169,42 +169,6 @@
 bpf_text_kprobe = """
 int kprobe__tcp_set_state(struct pt_regs *ctx, struct sock *sk, int state)
 {
- // check this is TCP
- u8 protocol = 0;
-
- // Following comments add by Joe Yin:
- // Unfortunately,it can not work since Linux 4.10,
- // because the sk_wmem_queued is not following the bitfield of sk_protocol.
- // And the following member is sk_gso_max_segs.
- // So, we can use this:
- // bpf_probe_read_kernel(&protocol, 1, (void *)((u64)&newsk->sk_gso_max_segs) - 3);
- // In order to diff the pre-4.10 and 4.10+ ,introduce the variables gso_max_segs_offset,sk_lingertime,
- // sk_lingertime is closed to the gso_max_segs_offset,and
- // the offset between the two members is 4
-
- int gso_max_segs_offset = offsetof(struct sock, sk_gso_max_segs);
- int sk_lingertime_offset = offsetof(struct sock, sk_lingertime);
-
- if (sk_lingertime_offset - gso_max_segs_offset == 4)
- // 4.10+ with little endian
-#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
- bpf_probe_read_kernel(&protocol, 1, (void *)((u64)&sk->sk_gso_max_segs) - 3);
-else
- // pre-4.10 with little endian
- bpf_probe_read_kernel(&protocol, 1, (void *)((u64)&sk->sk_wmem_queued) - 3);
-#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
- // 4.10+ with big endian
- bpf_probe_read_kernel(&protocol, 1, (void *)((u64)&sk->sk_gso_max_segs) - 1);
-else
- // pre-4.10 with big endian
- bpf_probe_read_kernel(&protocol, 1, (void *)((u64)&sk->sk_wmem_queued) - 1);
-#else
-# error "Fix your compiler's __BYTE_ORDER__?!"
-#endif
-
- if (protocol != IPPROTO_TCP)
- return 0;
-
  u32 pid = bpf_get_current_pid_tgid() >> 32;
  // sk is used as a UUID