linux-kernel - [PATCH net-next 1/2] net: get stats64 if device if driver is configured

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Date: Wed, 28 Feb 2024 03:31:21 -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,
	dsahern@...nel.org,
	Jiri Pirko <jiri@...nulli.us>,
	Daniel Borkmann <daniel@...earbox.net>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Coco Li <lixiaoyan@...gle.com>
Subject: [PATCH net-next 1/2] net: get stats64 if device if driver is configured

If the network driver is relying in the net core to do stats allocation,
then we want to dev_get_tstats64() instead of netdev_stats_to_stats64(),
since there are per-cpu stats that needs to be taken in consideration.

This will also simplify the drivers in regard to statistics. Once the
driver sets NETDEV_PCPU_STAT_TSTATS, it doesn't not need to allocate the
stacks, neither it needs to set `.ndo_get_stats64 = dev_get_tstats64`
for the generic stats collection function anymore.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 275fd5259a4a..3577620e39bd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10701,6 +10701,8 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
 		ops->ndo_get_stats64(dev, storage);
 	} else if (ops->ndo_get_stats) {
 		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
+	} else if (dev->pcpu_stat_type == NETDEV_PCPU_STAT_TSTATS) {
+		dev_get_tstats64(dev, storage);
 	} else {
 		netdev_stats_to_stats64(storage, &dev->stats);
 	}
-- 
2.43.0