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-rw-r--r--src/vnet/devices/devices.h10
-rw-r--r--src/vnet/devices/virtio/vhost_user_input.c4
2 files changed, 9 insertions, 5 deletions
diff --git a/src/vnet/devices/devices.h b/src/vnet/devices/devices.h
index ac5be229b76..cc960c98f23 100644
--- a/src/vnet/devices/devices.h
+++ b/src/vnet/devices/devices.h
@@ -148,16 +148,20 @@ vnet_device_input_set_interrupt_pending (vnet_main_t * vnm, u32 hw_if_index,
rt = vlib_node_get_runtime_data (vm, hw->input_node_index);
idx = hw->dq_runtime_index_by_queue[queue_id];
dq = vec_elt_at_index (rt->devices_and_queues, idx);
- dq->interrupt_pending = 1;
+
+ clib_atomic_store_rel_n (&(dq->interrupt_pending), 1);
vlib_node_set_interrupt_pending (vm, hw->input_node_index);
}
+/*
+ * Acquire RMW Access
+ * Paired with Release Store in vnet_device_input_set_interrupt_pending
+ */
#define foreach_device_and_queue(var,vec) \
for (var = (vec); var < vec_end (vec); var++) \
if ((var->mode == VNET_HW_INTERFACE_RX_MODE_POLLING) \
- || clib_smp_swap (&((var)->interrupt_pending), 0))
-
+ || clib_atomic_swap_acq_n (&((var)->interrupt_pending), 0))
#endif /* included_vnet_vnet_device_h */
diff --git a/src/vnet/devices/virtio/vhost_user_input.c b/src/vnet/devices/virtio/vhost_user_input.c
index 291d687ab6a..8e88695957b 100644
--- a/src/vnet/devices/virtio/vhost_user_input.c
+++ b/src/vnet/devices/virtio/vhost_user_input.c
@@ -641,8 +641,8 @@ VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm,
vec_foreach (dq, rt->devices_and_queues)
{
- if (clib_smp_swap (&dq->interrupt_pending, 0) ||
- (node->state == VLIB_NODE_STATE_POLLING))
+ if ((node->state == VLIB_NODE_STATE_POLLING) ||
+ clib_atomic_swap_acq_n (&dq->interrupt_pending, 0))
{
vui =
pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance);