diff mbox series

[net-next,3/5] net: ravb: Return cached statistics if the interface is down

Message ID 20240207120733.1746920-4-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show
Series net: ravb: Add runtime PM support (part 2) | expand

Commit Message

Claudiu Feb. 7, 2024, 12:07 p.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.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().

In order to avoid accessing the IP registers while the IP is runtime
suspended pm_runtime_active() check was introduced. The device runtime
PM usage counter has been incremented to avoid disabling the device clocks
while the check is in progress (if any).

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

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

Changes since [2]:
- use pm_runtime_get_noresume() and pm_runtime_active()

Changes in v3 of [2]:
- this was patch 18/21 in v2
- use ndev->flags & IFF_UP instead of netif_running checks

Changes in v2 of [2]:
- none; this patch is new

[2] https://lore.kernel.org/all/20240105082339.1468817-1-claudiu.beznea.uj@bp.renesas.com/

 drivers/net/ethernet/renesas/ravb_main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Sergey Shtylyov Feb. 7, 2024, 8:18 p.m. UTC | #1 
On 2/7/24 3:07 PM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.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().
> 
> In order to avoid accessing the IP registers while the IP is runtime
> suspended pm_runtime_active() check was introduced. The device runtime
> PM usage counter has been incremented to avoid disabling the device clocks
> while the check is in progress (if any).
> 
> The commit prepares the code for the addition of runtime PM support.
> 
> Suggested-by: Sergey Shtylyov <s.shtylyov@omp.ru>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>

[...]

MBR, Sergey
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 0f38e127ad45..4f8d5c9e9e03 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2155,8 +2155,15 @@  static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
 	struct net_device_stats *nstats, *stats0, *stats1;
+	struct device *dev = &priv->pdev->dev;
 
 	nstats = &ndev->stats;
+
+	pm_runtime_get_noresume(dev);
+
+	if (!pm_runtime_active(dev))
+		goto out_rpm_put;
+
 	stats0 = &priv->stats[RAVB_BE];
 
 	if (info->tx_counters) {
@@ -2198,6 +2205,8 @@  static struct net_device_stats *ravb_get_stats(struct net_device *ndev)
 		nstats->rx_over_errors += stats1->rx_over_errors;
 	}
 
+out_rpm_put:
+	pm_runtime_put_noidle(dev);
 	return nstats;
 }
 
@@ -2265,6 +2274,9 @@  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);
 }