netdev - [PATCH net-next v3 17/19] net: ravb: Return cached statistics if the interface is down

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Date: Fri,  5 Jan 2024 10:23:37 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: s.shtylyov@....ru,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	richardcochran@...il.com,
	p.zabel@...gutronix.de,
	yoshihiro.shimoda.uh@...esas.com,
	wsa+renesas@...g-engineering.com
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	claudiu.beznea@...on.dev,
	geert+renesas@...der.be,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v3 17/19] net: ravb: Return cached statistics if the interface is down

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Return the cached statistics in case the interface is down. There should be
no drawback to this, as cached statistics are updated in ravb_close().

The commit prepares the code for the addition of runtime PM support.

Suggested-by: Sergey Shtylyov <s.shtylyov@....ru>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v3:
- this was patch 18/21 in v2
- use ndev->flags & IFF_UP instead of netif_running checks

Changes in v2:
- none; this patch is new

 drivers/net/ethernet/renesas/ravb_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 76035afd4054..168b6208db37 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2117,6 +2117,9 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device_stats *nstats, *stats0, *stats1;
 
+	if (!(ndev->flags & IFF_UP))
+		return &ndev->stats;
+
 	nstats = &ndev->stats;
 	stats0 = &priv->stats[RAVB_BE];
 
@@ -2226,6 +2229,9 @@ static int ravb_close(struct net_device *ndev)
 	if (info->nc_queues)
 		ravb_ring_free(ndev, RAVB_NC);
 
+	/* Update statistics. */
+	ravb_get_stats(ndev);
+
 	/* Set reset mode. */
 	return ravb_set_opmode(ndev, CCC_OPC_RESET);
 }
-- 
2.39.2