[PATCH] net/vhost: get csum offload capabilities of vhost backend

[Wenwu Ma]

The current vhost backend lacks csum offloads information,
which will cause testpmd command such as "csum set tcp hw
<port_id>" to fail. This patch adds the information according
to the device features.

Signed-off-by: Wenwu Ma <wenwux...@intel.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/net/vhost/rte_eth_vhost.c 
b/drivers/net/vhost/rte_eth_vhost.c
index 070f0e6dfd..7593d5a9ae 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -1281,6 +1281,24 @@ eth_dev_info(struct rte_eth_dev *dev,
                                RTE_ETH_TX_OFFLOAD_VLAN_INSERT;
        dev_info->rx_offload_capa = RTE_ETH_RX_OFFLOAD_VLAN_STRIP;
 
+       if (internal->vid != -1) {
+               uint64_t features = 0;
+               if (rte_vhost_get_negotiated_features(internal->vid, &features) 
!= 0)
+                       return 0;
+
+               if (features & (1ULL << VIRTIO_NET_F_CSUM)) {
+                       dev_info->tx_offload_capa |= 
RTE_ETH_TX_OFFLOAD_TCP_CKSUM |
+                                               RTE_ETH_TX_OFFLOAD_UDP_CKSUM |
+                                               RTE_ETH_TX_OFFLOAD_IPV4_CKSUM;
+               }
+
+               if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
+                       dev_info->rx_offload_capa |= 
RTE_ETH_RX_OFFLOAD_TCP_CKSUM |
+                                               RTE_ETH_RX_OFFLOAD_UDP_CKSUM |
+                                               RTE_ETH_RX_OFFLOAD_IPV4_CKSUM;
+               }
+       }
+
        return 0;
 }
 
-- 
2.25.1