netdev-dpdk: Enable HW_CRC_STRIP for virtual functions.

Virtual functions such as igb_vf and i40e_vf require HW_CRC_STRIP to be
explicitly enabled before configuration, otherwise device configuration
will fail.

This commit achieves this by adding NETDEV_RX_HW_CRC_STRIP to
dpdk_hw_ol_features. When a dpdk device is added, the driver for the
device is examined, if the device is a virtual function enable
HW_CRC_STRIP.

Signed-off-by: Michal Weglicki <michalx.weglicki@intel.com>
Co-Authored: Ian Stokes <ian.stokes@intel.com>
Acked-by: Cian Ferriter <cian.ferriter@intel.com>
Tested-by: Cian Ferriter <cian.ferriter@intel.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

lib/netdev-dpdk.c

@@ -341,6 +341,7 @@ struct ingress_policer {
 
 enum dpdk_hw_ol_features {
     NETDEV_RX_CHECKSUM_OFFLOAD = 1 << 0,
+    NETDEV_RX_HW_CRC_STRIP = 1 << 1,
 };
 
 /*
@@ -796,6 +797,11 @@ dpdk_eth_dev_port_config(struct netdev_dpdk *dev, int n_rxq, int n_txq)
     conf.intr_conf.lsc = dev->lsc_interrupt_mode;
     conf.rxmode.hw_ip_checksum = (dev->hw_ol_features &
                                   NETDEV_RX_CHECKSUM_OFFLOAD) != 0;
+
+    if (dev->hw_ol_features & NETDEV_RX_HW_CRC_STRIP) {
+        conf.rxmode.hw_strip_crc = 1;
+    }
+
     /* A device may report more queues than it makes available (this has
      * been observed for Intel xl710, which reserves some of them for
      * SRIOV):  rte_eth_*_queue_setup will fail if a queue is not
@@ -885,6 +891,13 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
 
     rte_eth_dev_info_get(dev->port_id, &info);
 
+    if (strstr(info.driver_name, "vf") != NULL) {
+        VLOG_INFO("Virtual function detected, HW_CRC_STRIP will be enabled");
+        dev->hw_ol_features |= NETDEV_RX_HW_CRC_STRIP;
+    } else {
+        dev->hw_ol_features &= ~NETDEV_RX_HW_CRC_STRIP;
+    }
+
     if ((info.rx_offload_capa & rx_chksm_offload_capa) !=
             rx_chksm_offload_capa) {
         VLOG_WARN("Rx checksum offload is not supported on port "