netdev - [PATCH net-next v2 3/3] net: vrf: move to generic dstat helpers

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Message-Id: <20240605-dstats-v2-3-7fae03f813f3@codeconstruct.com.au>
Date: Wed, 05 Jun 2024 17:42:59 +0800
From: Jeremy Kerr <jk@...econstruct.com.au>
To: David Ahern <dsahern@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next v2 3/3] net: vrf: move to generic dstat helpers

The vrf driver has its own dstats-to-rtnl_link_stats64 collection, but
we now have a generic helper for this.

Switch to the generic helper.

In doing so, we fix a minor issue where the (non-percpu)
dev->stats->tx_errors value was never collected into rtnl_link_stats64,
as the generic dev_get_dstats64() consumes the starting values from
dev->stats.

Signed-off-by: Jeremy Kerr <jk@...econstruct.com.au>
---
 drivers/net/vrf.c | 29 +----------------------------
 1 file changed, 1 insertion(+), 28 deletions(-)

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 5018831b2a79..b1083620aeea 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -137,33 +137,6 @@ static void vrf_tx_error(struct net_device *vrf_dev, struct sk_buff *skb)
 	kfree_skb(skb);
 }

-static void vrf_get_stats64(struct net_device *dev,
-			    struct rtnl_link_stats64 *stats)
-{
-	int i;
-
-	for_each_possible_cpu(i) {
-		const struct pcpu_dstats *dstats;
-		u64 tbytes, tpkts, tdrops, rbytes, rpkts;
-		unsigned int start;
-
-		dstats = per_cpu_ptr(dev->dstats, i);
-		do {
-			start = u64_stats_fetch_begin(&dstats->syncp);
-			tbytes = u64_stats_read(&dstats->tx_bytes);
-			tpkts = u64_stats_read(&dstats->tx_packets);
-			tdrops = u64_stats_read(&dstats->tx_drops);
-			rbytes = u64_stats_read(&dstats->rx_bytes);
-			rpkts = u64_stats_read(&dstats->rx_packets);
-		} while (u64_stats_fetch_retry(&dstats->syncp, start));
-		stats->tx_bytes += tbytes;
-		stats->tx_packets += tpkts;
-		stats->tx_dropped += tdrops;
-		stats->rx_bytes += rbytes;
-		stats->rx_packets += rpkts;
-	}
-}
-
 static struct vrf_map *netns_vrf_map(struct net *net)
 {
 	struct netns_vrf *nn_vrf = net_generic(net, vrf_net_id);
@@ -1201,7 +1174,7 @@ static const struct net_device_ops vrf_netdev_ops = {
 	.ndo_uninit		= vrf_dev_uninit,
 	.ndo_start_xmit		= vrf_xmit,
 	.ndo_set_mac_address	= eth_mac_addr,
-	.ndo_get_stats64	= vrf_get_stats64,
+	.ndo_get_stats64	= dev_get_dstats64,
 	.ndo_add_slave		= vrf_add_slave,
 	.ndo_del_slave		= vrf_del_slave,
 };

-- 
2.39.2