diff mbox series

[net-next,v3,18/19] net: ravb: Do not apply RX CSUM settings to hardware if the interface is down

Message ID 20240105082339.1468817-19-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series net: ravb: Add suspend to RAM and runtime PM support for RZ/G3S | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1113 this patch: 1113
netdev/cc_maintainers success CCed 0 of 0 maintainers
netdev/build_clang success Errors and warnings before: 1140 this patch: 1140
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1140 this patch: 1140
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 9 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Claudiu Jan. 5, 2024, 8:23 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Do not apply the RX CSUM settings to hardware if the interface is down. In
case runtime PM is enabled, and while the interface is down, the IP will be
in reset mode (as for some platforms disabling the clocks will switch the
IP to reset mode, which will lead to losing registers content) and applying
settings in reset mode is not an option. Instead, cache the RX CSUM
settings and apply them in ravb_open() though ravb_emac_init().

Commit prepares for the addition of runtime PM.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v3:
- this was patch 20/21 in v2
- fixed typos in patch description
- removed code from ravb_open()
- use ndev->flags & IFF_UP checks instead of netif_running()

Changes in v2:
- none; this patch is new


 drivers/net/ethernet/renesas/ravb_main.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Sergey Shtylyov Jan. 8, 2024, 8:34 p.m. UTC | #1 
On 1/5/24 11:23 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Do not apply the RX CSUM settings to hardware if the interface is down. In
> case runtime PM is enabled, and while the interface is down, the IP will be
> in reset mode (as for some platforms disabling the clocks will switch the
> IP to reset mode, which will lead to losing registers content) and applying
> settings in reset mode is not an option. Instead, cache the RX CSUM
> settings and apply them in ravb_open() though ravb_emac_init().
> 
> Commit prepares for the addition of runtime PM.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 168b6208db37..e909960fbc30 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -2342,6 +2342,9 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
>  	struct ravb_private *priv = netdev_priv(ndev);
>  	unsigned long flags;
>  
> +	if (!(ndev->flags & IFF_UP))

   Well, I guess it's even OK to even write EDCMR in the reset mode... BUT
again, won't this race with pm_runtime_put_autosuspend() when its call gets
added to ravb_close()?

> +		return;
> +
>  	spin_lock_irqsave(&priv->lock, flags);
>  
>  	/* Disable TX and RX */

MBR, Sergey
Sergey Shtylyov Jan. 8, 2024, 8:36 p.m. UTC | #2 
On 1/8/24 11:34 PM, Sergey Shtylyov wrote:
[...]

>> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>>
>> Do not apply the RX CSUM settings to hardware if the interface is down. In
>> case runtime PM is enabled, and while the interface is down, the IP will be
>> in reset mode (as for some platforms disabling the clocks will switch the
>> IP to reset mode, which will lead to losing registers content) and applying
>> settings in reset mode is not an option. Instead, cache the RX CSUM
>> settings and apply them in ravb_open() though ravb_emac_init().
>>
>> Commit prepares for the addition of runtime PM.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> [...]
> 
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
>> index 168b6208db37..e909960fbc30 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -2342,6 +2342,9 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
>>  	struct ravb_private *priv = netdev_priv(ndev);
>>  	unsigned long flags;
>>  
>> +	if (!(ndev->flags & IFF_UP))
> 
>    Well, I guess it's even OK to even write EDCMR in the reset mode... BUT

   Well, I guess it's even OK to write ECMR in the reset mode... :-)

> again, won't this race with pm_runtime_put_autosuspend() when its call gets
> added to ravb_close()?

[...]

MBR, Sergey
Sergey Shtylyov Jan. 8, 2024, 8:49 p.m. UTC | #3 
On 1/5/24 11:23 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Do not apply the RX CSUM settings to hardware if the interface is down. In

   s/CSUM/checksum/?

> case runtime PM is enabled, and while the interface is down, the IP will be
> in reset mode (as for some platforms disabling the clocks will switch the
> IP to reset mode, which will lead to losing registers content) and applying
> settings in reset mode is not an option. Instead, cache the RX CSUM

   Same here...

> settings and apply them in ravb_open() though ravb_emac_init().

   Through?

> Commit prepares for the addition of runtime PM.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
[...]

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 168b6208db37..e909960fbc30 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2342,6 +2342,9 @@  static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
 	struct ravb_private *priv = netdev_priv(ndev);
 	unsigned long flags;
 
+	if (!(ndev->flags & IFF_UP))
+		return;
+
 	spin_lock_irqsave(&priv->lock, flags);
 
 	/* Disable TX and RX */