net: selftest: fix build issue if INET is disabled

In case ethernet driver is enabled and INET is disabled, selftest will
fail to build.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Fixes: 3e1e58d64c ("net: add generic selftest support")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20210428130947.29649-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/Kconfig

@@ -431,7 +431,7 @@ config SOCK_VALIDATE_XMIT
 
 config NET_SELFTESTS
 	def_tristate PHYLIB
-	depends on PHYLIB
+	depends on PHYLIB && INET
 
 config NET_SOCK_MSG
 	bool

net/core/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_NETPOLL) += netpoll.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
 obj-$(CONFIG_TRACEPOINTS) += net-traces.o
 obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o
+obj-$(CONFIG_NET_SELFTESTS) += selftests.o
 obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += timestamping.o
 obj-$(CONFIG_NET_PTP_CLASSIFY) += ptp_classifier.o
 obj-$(CONFIG_CGROUP_NET_PRIO) += netprio_cgroup.o
@@ -33,7 +34,6 @@ obj-$(CONFIG_NET_DEVLINK) += devlink.o
 obj-$(CONFIG_GRO_CELLS) += gro_cells.o
 obj-$(CONFIG_FAILOVER) += failover.o
 ifeq ($(CONFIG_INET),y)
-obj-$(CONFIG_NET_SELFTESTS) += selftests.o
 obj-$(CONFIG_NET_SOCK_MSG) += skmsg.o
 obj-$(CONFIG_BPF_SYSCALL) += sock_map.o
 endif

net/dsa/Kconfig

@@ -9,7 +9,7 @@ menuconfig NET_DSA
 	select NET_SWITCHDEV
 	select PHYLINK
 	select NET_DEVLINK
-	select NET_SELFTESTS
+	imply NET_SELFTESTS
 	help
 	  Say Y if you want to enable support for the hardware switches supported
 	  by the Distributed Switch Architecture.