WARNING: line length of 83 exceeds 80 columns
#66: FILE: tools/testing/selftests/net/forwarding/ipmr.c:69:
+	.mfc_check_cmd = "cat /proc/net/ip_mr_cache | grep -q '00000000 00000000'",

WARNING: quoted string split across lines
#94: FILE: tools/testing/selftests/net/forwarding/ipmr.c:97:
+	.mfc_check_cmd = "cat /proc/net/ip6_mr_cache | "
+		"grep -q '0000:0000:0000:0000:0000:0000:0000:0000 0000:0000:0000:0000:0000:0000:0000:0000'",

WARNING: Macros with flow control statements should be avoided
#243: FILE: tools/testing/selftests/net/forwarding/ipmr.c:327:
+#define SKIP_IPV6()						\
+	do {							\
+		if (variant->family == AF_INET6)		\
+			SKIP(return,				\
+			     "no netlink MFC interface");	\
+	} while (0)

WARNING: line length of 87 exceeds 80 columns
#375: FILE: tools/testing/selftests/net/forwarding/ipmr.c:498:
+				 variant->level, variant->opts[MRT_ADD_MFC - MRT_BASE],

total: 0 errors, 4 warnings, 0 checks, 343 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 01a33363bb82 ("selftest: net: Extend ipmr.c for IP6MR.") 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, 0 checks, 343 lines checked