WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#21: 
new file mode 100644

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#26: FILE: tools/testing/selftests/bpf/prog_tests/so_timestamping.c:1:
+#define _GNU_SOURCE

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

WARNING: line length of 84 exceeds 80 columns
#211: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:85:
+	n = bpf_loop(ARRAY_SIZE(sol_socket_tests), bpf_test_socket_sockopt, &lc, 0);

WARNING: line length of 85 exceeds 80 columns
#233: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:107:
+		shinfo = bpf_core_cast(skb->head + skb->end, struct skb_shared_info);

CHECK: multiple assignments should be avoided
#250: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:124:
+		delay = val->sched_delay = timestamp - val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#254: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:128:
+		delay = val->sw_snd_delay = timestamp - prior_ts;

WARNING: line length of 82 exceeds 80 columns
#257: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:131:
+		prior_ts = val->sw_snd_delay + val->sched_delay + val->sendmsg_ns;

CHECK: multiple assignments should be avoided
#258: FILE: tools/testing/selftests/bpf/progs/so_timestamping.c:132:
+		delay = val->ack_delay = timestamp - prior_ts;

total: 0 errors, 6 warnings, 3 checks, 281 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 e95c8b795135 ("bpf: add simple bpf tests in the tx path for so_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.
total: 0 errors, 6 warnings, 3 checks, 281 lines checked