Re: [dpdk-stable] [dpdk-dev] [PATCH] net/ixgbe: fix link state timing issue on fiber ports

[Ye Xiaolong <xiaolong.ye@intel.com>]

On 05/08, Phil Yang wrote:
>> Subject: [dpdk-dev] [PATCH] net/ixgbe: fix link state timing issue on fiber
>> ports
>> 
>> With some models of fiber ports (e.g. X520-2 device ID 0x10fb), it
>> is possible when a port is started to experience a timing issue
>> which prevents the link from ever being fully set up.
>> 
>> In ixgbe_dev_link_update_share(), if the media type is fiber and the
>> link is down, a flag (IXGBE_FLAG_NEED_LINK_CONFIG) is set. A callback
>> to ixgbe_dev_setup_link_thread_handler() is scheduled which should
>> try to set up the link and clear the flag afterwards.
>> 
>> If the device is started before the flag is cleared, the scheduled
>> callback is cancelled. This causes the flag to remain set and
>> subsequent calls to ixgbe_dev_link_update_share() return
>> without trying to retrieve the link state because the flag is set.
>> 
>> In ixgbe_dev_cancel_link_thread(), after cancelling the callback,
>> unset the flag on the device to avoid this condition.
>> 
>> Fixes: 819d0d1d57f1 ("net/ixgbe: fix blocking system events")
>> Cc: stable@dpdk.org
>> 
>> Bugzilla ID: 388
>> 
>> Signed-off-by: Phil Yang <phil.yang@arm.com>
>> Signed-off-by: Lijian Zhang <lijian.zhang@arm.com>
>> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
>> ---
>
>Ping.

This fix makes sense to me, thanks for the work.
And it seems can't be applied to latest dpdk-next-net-intel cleanly, could you
do a rebase?

Thanks,
Xiaolong

>
>Thanks,
>Phil
>
><Snip>