Re: [PATCH V4 RESEND net-next 6/7] net: hibmcge: Add reset supported in this module

[Simon Horman]

On Tue, Dec 03, 2024 at 11:01:30PM +0800, Jijie Shao wrote:
> Sometimes, if the port doesn't work, we can try to fix it by resetting it.
> 
> This patch supports reset triggered by ethtool or FLR of PCIe, For example:
>  ethtool --reset eth0 dedicated
>  echo 1 > /sys/bus/pci/devices/0000\:83\:00.1/reset
> 
> We hope that the reset can be performed only when the port is down,
> and the port cannot be up during the reset.
> Therefore, the entire reset process is protected by the rtnl lock.
> But the ethtool command already holds the rtnl lock in the dev_ethtool().
> So, the reset operation is not directly performed in
> ethtool_ops.reset() function. Instead, the reset operation
> is triggered by a scheduled task.
> 
> After the reset is complete, the hardware registers are restored
> to their default values. Therefore, some rebuild operations are
> required to rewrite the user configuration to the registers.
> 
> Signed-off-by: Jijie Shao <shaojijie@xxxxxxxxxx>

Reviewed-by: Simon Horman <horms@xxxxxxxxxx>