[DPDK 20.11] ixgbe VF PMD does not support LSC interrupts.

[Abdelfattah Chehab]

Hi All,
While using net_e1000_igb_vf PMD, registering LSC Callbacks will have no effect.
rte_eth_dev_callback_register(port, RTE_ETH_EVENT_INTR_LSC, callback, NULL);

in the PMD code:
 .drv_flags = RTE_PCI_DRV_NEED_MAPPING

While for other working PMDs:
drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC

Meanwhile, The link status is updated correctly on demand:
(gdb) call rte_eth_link_get(4, $mylink)
$3 = 0
(gdb) p *$mylink
$4 = {link_speed = 1000, link_duplex = 1, link_autoneg = 1, link_status = 1}
(gdb) call rte_eth_link_get(4, $mylink)
$5 = 0
(gdb) p *$mylink
$6 = {link_speed = 0, link_duplex = 0, link_autoneg = 0, link_status = 0}

Does it mean that I have to fetch the link using poll action?
Will LSC interrupt be implemented for this PMD in future release ?

Thanks
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