Re: [PATCH net-next 8/9] net-timestamp: add bpf framework for rx timestamps

[kernel test robot <lkp@intel.com>]

Hi Jason,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Jason-Xing/net-timestamp-add-bpf-infrastructure-to-allow-exposing-more-information-later/20241008-175458
base:   net-next/main
patch link:    https://lore.kernel.org/r/20241008095109.99918-9-kerneljasonxing%40gmail.com
patch subject: [PATCH net-next 8/9] net-timestamp: add bpf framework for rx timestamps
config: arm-exynos_defconfig (https://download.01.org/0day-ci/archive/20241009/202410091146.2OM6QWPq-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241009/202410091146.2OM6QWPq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410091146.2OM6QWPq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/ipv4/tcp.c:2297:29: error: passing 'const struct sock *' to parameter of type 'struct sock *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
    2297 |         if (tcp_bpf_recv_timestamp(sk, tss))
         |                                    ^~
   net/ipv4/tcp.c:2279:49: note: passing argument to parameter 'sk' here
    2279 | static bool tcp_bpf_recv_timestamp(struct sock *sk, struct scm_timestamping_internal *tss)
         |                                                 ^
   1 error generated.


vim +2297 net/ipv4/tcp.c

  2288	
  2289	/* Similar to __sock_recv_timestamp, but does not require an skb */
  2290	void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
  2291				struct scm_timestamping_internal *tss)
  2292	{
  2293		int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
  2294		u32 tsflags = READ_ONCE(sk->sk_tsflags);
  2295		bool has_timestamping = false;
  2296	
> 2297		if (tcp_bpf_recv_timestamp(sk, tss))
  2298			return;
  2299	
  2300		if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) {
  2301			if (sock_flag(sk, SOCK_RCVTSTAMP)) {
  2302				if (sock_flag(sk, SOCK_RCVTSTAMPNS)) {
  2303					if (new_tstamp) {
  2304						struct __kernel_timespec kts = {
  2305							.tv_sec = tss->ts[0].tv_sec,
  2306							.tv_nsec = tss->ts[0].tv_nsec,
  2307						};
  2308						put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
  2309							 sizeof(kts), &kts);
  2310					} else {
  2311						struct __kernel_old_timespec ts_old = {
  2312							.tv_sec = tss->ts[0].tv_sec,
  2313							.tv_nsec = tss->ts[0].tv_nsec,
  2314						};
  2315						put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
  2316							 sizeof(ts_old), &ts_old);
  2317					}
  2318				} else {
  2319					if (new_tstamp) {
  2320						struct __kernel_sock_timeval stv = {
  2321							.tv_sec = tss->ts[0].tv_sec,
  2322							.tv_usec = tss->ts[0].tv_nsec / 1000,
  2323						};
  2324						put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
  2325							 sizeof(stv), &stv);
  2326					} else {
  2327						struct __kernel_old_timeval tv = {
  2328							.tv_sec = tss->ts[0].tv_sec,
  2329							.tv_usec = tss->ts[0].tv_nsec / 1000,
  2330						};
  2331						put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
  2332							 sizeof(tv), &tv);
  2333					}
  2334				}
  2335			}
  2336	
  2337			if (tsflags & SOF_TIMESTAMPING_SOFTWARE &&
  2338			    (tsflags & SOF_TIMESTAMPING_RX_SOFTWARE ||
  2339			     !(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER)))
  2340				has_timestamping = true;
  2341			else
  2342				tss->ts[0] = (struct timespec64) {0};
  2343		}
  2344	
  2345		if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) {
  2346			if (tsflags & SOF_TIMESTAMPING_RAW_HARDWARE &&
  2347			    (tsflags & SOF_TIMESTAMPING_RX_HARDWARE ||
  2348			     !(tsflags & SOF_TIMESTAMPING_OPT_RX_FILTER)))
  2349				has_timestamping = true;
  2350			else
  2351				tss->ts[2] = (struct timespec64) {0};
  2352		}
  2353	
  2354		if (has_timestamping) {
  2355			tss->ts[1] = (struct timespec64) {0};
  2356			if (sock_flag(sk, SOCK_TSTAMP_NEW))
  2357				put_cmsg_scm_timestamping64(msg, tss);
  2358			else
  2359				put_cmsg_scm_timestamping(msg, tss);
  2360		}
  2361	}
  2362	

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