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

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@huawei.com>

Reviewed-by: Simon Horman <horms@kernel.org>