==========
checkpatch - FAILED

WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#36: 
new file mode 100644

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#41: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:1:
+#include <linux/net_tstamp.h>

CHECK: multiple assignments should be avoided
#99: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:59:
+		SK_TS_TXSW = SK_TS_ACK = 0;

CHECK: No space is necessary after a cast
#125: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:85:
+			tss = (void *) CMSG_DATA(cm);

CHECK: No space is necessary after a cast
#132: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:92:
+			serr = (void *) CMSG_DATA(cm);

CHECK: Alignment should match open parenthesis
#134: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:94:
+			ASSERT_EQ(serr->ee_origin, SO_EE_ORIGIN_TIMESTAMPING,
+				    "cmsg type");

CHECK: Blank lines aren't necessary before a close brace '}'
#173: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:133:
+
+}

ERROR: trailing statements should be on next line
#177: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:137:
+	while (!socket_recv_errmsg(fd));

CHECK: No space is necessary after a cast
#209: FILE: tools/testing/selftests/bpf/prog_tests/net_timestamping.c:169:
+			 (char *) &sock_opt, sizeof(sock_opt));

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#278: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:1:
+#include "vmlinux.h"

WARNING: line length of 92 exceeds 80 columns
#328: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:51:
+extern int bpf_sock_ops_enable_tx_tstamp(struct bpf_sock_ops_kern *skops, u64 flags) __ksym;

CHECK: Alignment should match open parenthesis
#381: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:104:
+static bool bpf_test_access_bpf_calls(struct bpf_sock_ops *skops,
+				     const struct sock *sk)

CHECK: multiple assignments should be avoided
#441: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:164:
+		delay = val->sched_delay = timestamp - val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#445: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:168:
+		delay = val->sw_snd_delay = timestamp - prior_ts;

WARNING: line length of 82 exceeds 80 columns
#448: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:171:
+		prior_ts = val->sw_snd_delay + val->sched_delay + val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#449: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:172:
+		delay = val->ack_delay = timestamp - prior_ts;

WARNING: line length of 88 exceeds 80 columns
#464: FILE: tools/testing/selftests/bpf/progs/net_timestamping.c:187:
+int BPF_PROG(trace_tcp_sendmsg_locked, struct sock *sk, struct msghdr *msg, size_t size)

total: 1 errors, 6 warnings, 10 checks, 475 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 81cbc6dc5230 ("selftests/bpf: add simple bpf tests in the tx path for timestamping feature") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.