WARNING: line length of 86 exceeds 80 columns
#51: FILE: tools/testing/selftests/net/forwarding/lib.sh:113:
+		if [[ ! -z $driver_name && $driver_name == $NETIF_FIND_DRIVER ]]; then

WARNING: 'speficied' may be misspelled - perhaps 'specified'?
#58: FILE: tools/testing/selftests/net/forwarding/lib.sh:120:
+# Whether to find netdevice according to the driver speficied by the importer
                                                     ^^^^^^^^^

total: 0 errors, 2 warnings, 0 checks, 43 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 70dc13800575 ("selftests: forwarding: add ability to assemble NETIFS array by driver name") 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, 2 warnings, 0 checks, 43 lines checked