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From: Breno Leitao <leitao@debian.org>
To: Pablo Neira Ayuso <pablo@netfilter.org>,
	Harald Welte <laforge@gnumonks.org>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Paolo Abeni <pabeni@redhat.com>
Cc: netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	horms@kernel.org,
	dsahern@kernel.org,
	osmocom-net-gprs@lists.osmocom.org (open list:GTP (GPRS Tunneling Protocol))
Subject: [PATCH net-next 1/3] net: gtp: Leverage core stats allocator
Date: Tue,  5 Mar 2024 04:15:21 -0800
Message-ID: <20240305121524.2254533-1-leitao@debian.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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 in 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 gtp driver and leverage the network
core allocation instead.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 drivers/net/gtp.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 2b46b7398ade..facbfba5d77f 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -717,10 +717,6 @@ static int gtp_dev_init(struct net_device *dev)
 
 	gtp->dev = dev;
 
-	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
 	return 0;
 }
 
@@ -729,7 +725,6 @@ static void gtp_dev_uninit(struct net_device *dev)
 	struct gtp_dev *gtp = netdev_priv(dev);
 
 	gtp_encap_disable(gtp);
-	free_percpu(dev->tstats);
 }
 
 static inline void gtp0_push_header(struct sk_buff *skb, struct pdp_ctx *pctx)
@@ -970,6 +965,7 @@ static void gtp_link_setup(struct net_device *dev)
 	dev->type = ARPHRD_NONE;
 	dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
 
+	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 	dev->priv_flags	|= IFF_NO_QUEUE;
 	dev->features	|= NETIF_F_LLTX;
 	netif_keep_dst(dev);
-- 
2.43.0