testing: net-drv: add basic shaper test

Leverage a basic/dummy netdevsim implementation to do functional
coverage for NL interface.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Link: https://patch.msgid.link/43092afbf38365c796088bf8fc155e523ab434ae.1728460186.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/Kconfig

@@ -641,6 +641,7 @@ config NETDEVSIM
 	depends on PTP_1588_CLOCK_MOCK || PTP_1588_CLOCK_MOCK=n
 	select NET_DEVLINK
 	select PAGE_POOL
+	select NET_SHAPER
 	help
 	  This driver is a developer testing tool and software model that can
 	  be used to test various control path networking APIs, especially

drivers/net/netdevsim/ethtool.c

@@ -103,8 +103,10 @@ nsim_set_channels(struct net_device *dev, struct ethtool_channels *ch)
 	struct netdevsim *ns = netdev_priv(dev);
 	int err;
 
+	mutex_lock(&dev->lock);
 	err = netif_set_real_num_queues(dev, ch->combined_count,
 					ch->combined_count);
+	mutex_unlock(&dev->lock);
 	if (err)
 		return err;
 

drivers/net/netdevsim/netdev.c

@@ -22,6 +22,7 @@
 #include <net/netdev_queues.h>
 #include <net/page_pool/helpers.h>
 #include <net/netlink.h>
+#include <net/net_shaper.h>
 #include <net/pkt_cls.h>
 #include <net/rtnetlink.h>
 #include <net/udp_tunnel.h>
@@ -475,6 +476,43 @@ static int nsim_stop(struct net_device *dev)
 	return 0;
 }
 
+static int nsim_shaper_set(struct net_shaper_binding *binding,
+			   const struct net_shaper *shaper,
+			   struct netlink_ext_ack *extack)
+{
+	return 0;
+}
+
+static int nsim_shaper_del(struct net_shaper_binding *binding,
+			   const struct net_shaper_handle *handle,
+			   struct netlink_ext_ack *extack)
+{
+	return 0;
+}
+
+static int nsim_shaper_group(struct net_shaper_binding *binding,
+			     int leaves_count,
+			     const struct net_shaper *leaves,
+			     const struct net_shaper *root,
+			     struct netlink_ext_ack *extack)
+{
+	return 0;
+}
+
+static void nsim_shaper_cap(struct net_shaper_binding *binding,
+			    enum net_shaper_scope scope,
+			    unsigned long *flags)
+{
+	*flags = ULONG_MAX;
+}
+
+static const struct net_shaper_ops nsim_shaper_ops = {
+	.set			= nsim_shaper_set,
+	.delete			= nsim_shaper_del,
+	.group			= nsim_shaper_group,
+	.capabilities		= nsim_shaper_cap,
+};
+
 static const struct net_device_ops nsim_netdev_ops = {
 	.ndo_start_xmit		= nsim_start_xmit,
 	.ndo_set_rx_mode	= nsim_set_rx_mode,
@@ -496,6 +534,7 @@ static const struct net_device_ops nsim_netdev_ops = {
 	.ndo_bpf		= nsim_bpf,
 	.ndo_open		= nsim_open,
 	.ndo_stop		= nsim_stop,
+	.net_shaper_ops		= &nsim_shaper_ops,
 };
 
 static const struct net_device_ops nsim_vf_netdev_ops = {

tools/testing/selftests/drivers/net/Makefile

@@ -9,6 +9,7 @@ TEST_PROGS := \
 	ping.py \
 	queues.py \
 	stats.py \
+	shaper.py
 # end of TEST_PROGS
 
 include ../../lib.mk