tools: ynl: generate code for the ethtool family

Generate the protocol code for ethtool. Skip the stats
for now, they are the only outlier in terms of complexity.
Stats are a sort-of semi-polymorphic (attr space of a nest
depends on value of another attr) or a type-value-scalar,
depending on how one wants to look at it...
A challenge for another time.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/net/ynl/generated/Makefile

@@ -7,9 +7,12 @@ ifeq ("$(DEBUG)","1")
   CFLAGS += -g -fsanitize=address -fsanitize=leak -static-libasan
 endif
 
+YNL_GEN_ARG_ethtool:=--user-header linux/ethtool_netlink.h \
+	--exclude-op stats-get
+
 TOOL:=../ynl-gen-c.py
 
-GENS:=devlink handshake fou netdev
+GENS:=ethtool devlink handshake fou netdev
 SRCS=$(patsubst %,%-user.c,${GENS})
 HDRS=$(patsubst %,%-user.h,${GENS})
 OBJS=$(patsubst %,%-user.o,${GENS})
@@ -22,11 +25,11 @@ protos.a: $(OBJS)
 
 %-user.h: ../../../../Documentation/netlink/specs/%.yaml $(TOOL)
 	@echo -e "\tGEN $@"
-	@$(TOOL) --mode user --header --spec $< > $@
+	@$(TOOL) --mode user --header --spec $< $(YNL_GEN_ARG_$*) > $@
 
 %-user.c: ../../../../Documentation/netlink/specs/%.yaml $(TOOL)
 	@echo -e "\tGEN $@"
-	@$(TOOL) --mode user --source --spec $< > $@
+	@$(TOOL) --mode user --source --spec $< $(YNL_GEN_ARG_$*) > $@
 
 %-user.o: %-user.c %-user.h
 	@echo -e "\tCC $@"