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net/ixgbevf: add full link status check option
[ upstream commit bd28203 ] To get the VF's link status by calling 'rte_eth_link_get_nowait()', the VF not only check PF's physical link status, but also check the mailbox running status. And mailbox checking will generate mailbox interrupt in PF, it will be worse if many VFs are running in the system, the PF will have to handle many interrrupts. Normally, checking the PF's physical link status is enough for nowait. For different scenarios, adding an 'pflink_fullchk' option to control whether to check the link fully or not. Fixes: 91546fb ("net/ixgbevf: fix link state") Signed-off-by: Haiyue Wang <haiyue.wang@intel.com> Acked-by: Scott Daniels <daniels@research.att.com> Acked-by: Qi Zhang <qi.z.zhang@intel.com>
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