net: em_canid: Ematch rule to match CAN frames according to their identifiers

This ematch makes it possible to classify CAN frames (AF_CAN) according
to their identifiers. This functionality can not be easily achieved with
existing classifiers, such as u32, because CAN identifier is always stored
in native endianness, whereas u32 expects Network byte order.

Signed-off-by: Rostislav Lisovy <lisovy@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index e7a8976bf25c..4a5d2bd4f789 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -507,6 +507,16 @@ config NET_EMATCH_TEXT
           To compile this code as a module, choose M here: the
           module will be called em_text.
 
+config NET_EMATCH_CANID
+        tristate "CAN Identifier"
+        depends on NET_EMATCH && CAN
+        ---help---
+          Say Y here if you want to be able to classify CAN frames based
+          on CAN Identifier.
+
+          To compile this code as a module, choose M here: the
+          module will be called em_canid.
+
 config NET_CLS_ACT
         bool "Actions"
         ---help---