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

[Phil Yang]

> 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 at dpdk.org
> 
> Bugzilla ID: 388
> 
> Signed-off-by: Phil Yang <phil.yang at arm.com>
> Signed-off-by: Lijian Zhang <lijian.zhang at arm.com>
> Reviewed-by: Gavin Hu <gavin.hu at arm.com>
> ---

Ping.

Thanks,
Phil

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