linux-kernel - [PATCH net-next] net/dummy: Move stats allocation to core

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Date: Mon, 19 Feb 2024 05:43:28 -0800
From: Breno Leitao <leitao@...ian.org>
To: kuba@...nel.org,
	davem@...emloft.net,
	pabeni@...hat.com,
	edumazet@...gle.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	horms@...nel.org
Subject: [PATCH net-next] net/dummy: Move stats allocation to core

With commit 34d21de99cea9 ("net: Move {l,t,d}stats allocation to core and
convert veth & vrf"), stats allocation could be done on net core instead
of this driver.

With this new approach, the driver doesn't have to bother with error
handling (allocation failure checking, making sure free happens in the
right spot, etc). This is core responsibility now.

Move dummy driver to leverage the core allocation.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 drivers/net/dummy.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
index 946bba0701a4..d29b5d7af0d7 100644
--- a/drivers/net/dummy.c
+++ b/drivers/net/dummy.c
@@ -67,19 +67,12 @@ static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
 
 static int dummy_dev_init(struct net_device *dev)
 {
-	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
-	if (!dev->lstats)
-		return -ENOMEM;
+	dev->pcpu_stat_type = NETDEV_PCPU_STAT_LSTATS;
 
 	netdev_lockdep_set_classes(dev);
 	return 0;
 }
 
-static void dummy_dev_uninit(struct net_device *dev)
-{
-	free_percpu(dev->lstats);
-}
-
 static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
 {
 	if (new_carrier)
@@ -91,7 +84,6 @@ static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
 
 static const struct net_device_ops dummy_netdev_ops = {
 	.ndo_init		= dummy_dev_init,
-	.ndo_uninit		= dummy_dev_uninit,
 	.ndo_start_xmit		= dummy_xmit,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_rx_mode	= set_multicast_list,
-- 
2.39.3