net: mana: Reduce waiting time if HWC not responding

[PATCH net-next] net: mana: Reduce waiting time if HWC not responding

Posted by Haiyang Zhang 3 weeks ago

From: Haiyang Zhang <haiyangz@microsoft.com>

If HW Channel (HWC) is not responding, reduce the waiting time, so further
steps will fail quickly.
This will prevent getting stuck for a long time (30 minutes or more), for
example, during unloading while HWC is not responding.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/net/ethernet/microsoft/mana/hw_channel.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
index ef072e24c46d..ada6c78a2bef 100644
--- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
+++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
@@ -881,7 +881,12 @@ int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
 	if (!wait_for_completion_timeout(&ctx->comp_event,
 					 (msecs_to_jiffies(hwc->hwc_timeout)))) {
 		if (hwc->hwc_timeout != 0)
-			dev_err(hwc->dev, "HWC: Request timed out!\n");
+			dev_err(hwc->dev, "HWC: Request timed out: %u ms\n",
+				hwc->hwc_timeout);
+
+		/* Reduce further waiting if HWC no response */
+		if (hwc->hwc_timeout > 1)
+			hwc->hwc_timeout = 1;
 
 		err = -ETIMEDOUT;
 		goto out;
-- 
2.34.1

Re: [PATCH net-next] net: mana: Reduce waiting time if HWC not responding

Posted by Simon Horman 2 weeks, 6 days ago

On Wed, Sep 10, 2025 at 01:57:21PM -0700, Haiyang Zhang wrote:
> From: Haiyang Zhang <haiyangz@microsoft.com>
> 
> If HW Channel (HWC) is not responding, reduce the waiting time, so further
> steps will fail quickly.
> This will prevent getting stuck for a long time (30 minutes or more), for
> example, during unloading while HWC is not responding.
> 
> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
> ---
>  drivers/net/ethernet/microsoft/mana/hw_channel.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> index ef072e24c46d..ada6c78a2bef 100644
> --- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
> +++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> @@ -881,7 +881,12 @@ int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
>  	if (!wait_for_completion_timeout(&ctx->comp_event,
>  					 (msecs_to_jiffies(hwc->hwc_timeout)))) {
>  		if (hwc->hwc_timeout != 0)
> -			dev_err(hwc->dev, "HWC: Request timed out!\n");
> +			dev_err(hwc->dev, "HWC: Request timed out: %u ms\n",
> +				hwc->hwc_timeout);
> +
> +		/* Reduce further waiting if HWC no response */
> +		if (hwc->hwc_timeout > 1)
> +			hwc->hwc_timeout = 1;

Hi,

Perhaps it is already the case, but I'm wondering if the configured
value of hwc_timeout should be restored at some point.

>  
>  		err = -ETIMEDOUT;
>  		goto out;
> -- 
> 2.34.1
> 
>