net/ena: enable write combining

Write combining (WC) increases NIC performance by making better
utilization of PCI bus. ENA PMD may make usage of this feature.

To enable it load igb_uio driver with wc_activate set to 1.

Signed-off-by: Rafal Kozik <rk@semihalf.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 9ae73e3..1870edf 100644 (file)
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -2210,7 +2210,8 @@ static int eth_ena_pci_remove(struct rte_pci_device *pci_dev)
 
 static struct rte_pci_driver rte_ena_pmd = {
        .id_table = pci_id_ena_map,
-       .drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
+       .drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC |
+                    RTE_PCI_DRV_WC_ACTIVATE,
        .probe = eth_ena_pci_probe,
        .remove = eth_ena_pci_remove,
 };