WARNING: line length of 83 exceeds 80 columns
#39: FILE: tools/testing/selftests/net/gro.c:119:
+		next_off = sizeof(struct iphdr) + offsetof(struct iphdr, protocol);

WARNING: line length of 85 exceeds 80 columns
#81: FILE: tools/testing/selftests/net/gro.c:324:
+		fill_networklayer(buf + ETH_HLEN, payload_len + sizeof(struct iphdr),

WARNING: line length of 81 exceeds 80 columns
#101: FILE: tools/testing/selftests/net/gro.c:437:
+			iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);

WARNING: line length of 86 exceeds 80 columns
#146: FILE: tools/testing/selftests/net/gro.c:1283:
+	while ((c = getopt_long(argc, argv, "46d:D:ei:rs:S:t:v", opts, NULL)) != -1) {

total: 0 errors, 4 warnings, 0 checks, 143 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 c2074d8860bf ("selftests/net: test ipip packets in gro.sh") 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, 4 warnings, 0 checks, 143 lines checked