netdev-offload-dpdk: Fix vport hw-offload stat.

For vport devices hardware offload counters were being incremented
on the physical device but decremented on the vport, causing
incorrect statistics that didn't return to zero when flows are
removed.

Fix by using physdev instead of netdev for counter decrements to match
the increment behavior.

Fixes: 0e6366c ("netdev-offload-dpdk: Implement hw-offload statistics read.")
Signed-off-by: Linda Wang <[email protected]>
Signed-off-by: Kevin Traynor <[email protected]>

Author: Linda Wang

lib/netdev-offload-dpdk.c

@@ -2375,7 +2375,7 @@ netdev_offload_dpdk_flow_destroy(struct ufid_to_rte_flow_data *rte_flow_data)
         unsigned int tid = netdev_offload_thread_id();
 
         data = (struct netdev_offload_dpdk_data *)
-            ovsrcu_get(void *, &netdev->hw_info.offload_data);
+            ovsrcu_get(void *, &physdev->hw_info.offload_data);
         data->rte_flow_counters[tid]--;
 
         VLOG_DBG_RL(&rl, "%s/%s: rte_flow 0x%"PRIxPTR