[PATCH net-next] ipv6/sit: Do not allocate stats in the driver

[PATCH net-next] ipv6/sit: Do not allocate stats in the driver

[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.

Remove the allocation in the ipv6/sit driver and leverage the network
core allocation.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 net/ipv6/sit.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index ed3a44aa1e9d..5ad01480854d 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1408,7 +1408,6 @@ static void ipip6_dev_free(struct net_device *dev)
 	struct ip_tunnel *tunnel = netdev_priv(dev);
 
 	dst_cache_destroy(&tunnel->dst_cache);
-	free_percpu(dev->tstats);
 }
 
 #define SIT_FEATURES (NETIF_F_SG	   | \
@@ -1437,6 +1436,8 @@ static void ipip6_tunnel_setup(struct net_device *dev)
 	dev->features		|= NETIF_F_LLTX;
 	dev->features		|= SIT_FEATURES;
 	dev->hw_features	|= SIT_FEATURES;
+	dev->pcpu_stat_type	= NETDEV_PCPU_STAT_TSTATS;
+
 }
 
 static int ipip6_tunnel_init(struct net_device *dev)
@@ -1449,16 +1450,11 @@ static int ipip6_tunnel_init(struct net_device *dev)
 	strcpy(tunnel->parms.name, dev->name);
 
 	ipip6_tunnel_bind_dev(dev);
-	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!dev->tstats)
-		return -ENOMEM;
 
 	err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
-	if (err) {
-		free_percpu(dev->tstats);
-		dev->tstats = NULL;
+	if (err)
 		return err;
-	}
+
 	netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
 	netdev_lockdep_set_classes(dev);
 	return 0;
-- 
2.39.3

Re: [PATCH net-next] ipv6/sit: Do not allocate stats in the driver

[Simon Horman]

On Wed, Feb 21, 2024 at 08:17:32AM -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.
> 
> Remove the allocation in the ipv6/sit driver and leverage the network
> core allocation.
> 
> Signed-off-by: Breno Leitao <leitao@debian.org>

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

Re: [PATCH net-next] ipv6/sit: Do not allocate stats in the driver

[David Ahern]

On 2/21/24 9:17 AM, 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.
> 
> Remove the allocation in the ipv6/sit driver and leverage the network
> core allocation.
> 
> Signed-off-by: Breno Leitao <leitao@debian.org>
> ---
>  net/ipv6/sit.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>

Re: [PATCH net-next] ipv6/sit: Do not allocate stats in the driver

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 21 Feb 2024 08:17:32 -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] ipv6/sit: Do not allocate stats in the driver
    https://git.kernel.org/netdev/net-next/c/3e7a0dccf070

You are awesome, thank you!
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