WARNING: line length of 89 exceeds 80 columns
#137: FILE: tools/bpf/bpftool/net.c:640:
+static int get_first_tcx_prog_id(int ifindex, enum bpf_attach_type type, __u32 *first_id)

WARNING: line length of 97 exceeds 80 columns
#164: FILE: tools/bpf/bpftool/net.c:688:
+static int do_attach_tcx(int progfd, enum net_attach_type attach_type, int ifindex, bool prepend)

CHECK: Alignment should match open parenthesis
#173: FILE: tools/bpf/bpftool/net.c:697:
+			LIBBPF_OPTS(bpf_prog_attach_opts, opts,
+				.flags = BPF_F_BEFORE | BPF_F_ID,

WARNING: line length of 82 exceeds 80 columns
#176: FILE: tools/bpf/bpftool/net.c:700:
+			return bpf_prog_attach_opts(progfd, ifindex, type, &opts);

WARNING: line length of 86 exceeds 80 columns
#204: FILE: tools/bpf/bpftool/net.c:753:
+			p_err("expected 'overwrite' or 'prepend', got: '%s'?", *argv);

total: 0 errors, 4 warnings, 1 checks, 160 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 e8957083f2a3 ("bpftool: Add 'prepend' option for tcx attach to insert at chain start") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES 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, 4 warnings, 1 checks, 160 lines checked