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

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

[Breno Leitao]

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@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.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

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

[Simon Horman]

On Mon, Feb 19, 2024 at 05:43:28AM -0800, Breno Leitao wrote:
> 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@kernel.org>
> Signed-off-by: Breno Leitao <leitao@debian.org>

Reviewed-by: Simon Horman <horms@kernel.org>

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

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Mon, 19 Feb 2024 05:43:28 -0800 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [net-next] net/dummy: Move stats allocation to core
    https://git.kernel.org/netdev/net-next/c/a381690dd842

You are awesome, thank you!
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