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authorDamjan Marion <damarion@cisco.com>2020-10-19 17:15:58 +0200
committerDamjan Marion <dmarion@me.com>2020-10-21 11:00:12 +0000
commitd96b28ac0917cedddf2680e1501c101d9df91c6a (patch)
tree7ef6ab72ab2cf96501d4201305b525945970b467 /src/vnet/devices
parentdc18124e6c7ecc129a886132c4cdacd8105321b3 (diff)
virtio: improve input node performance
- Avoid feature arc lookup per packet, as all packets belong to the same interface - don't validate enqueue for l2 packets, as they all have same destionation Type: improvement Change-Id: I32ddd801f219eab9281736abafdc91a4ff9e0989 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/devices')
-rw-r--r--src/vnet/devices/virtio/node.c39
1 files changed, 26 insertions, 13 deletions
diff --git a/src/vnet/devices/virtio/node.c b/src/vnet/devices/virtio/node.c
index 960af992cfb..94bf097df55 100644
--- a/src/vnet/devices/virtio/node.c
+++ b/src/vnet/devices/virtio/node.c
@@ -267,7 +267,7 @@ virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vnet_main_t *vnm = vnet_get_main ();
u32 thread_index = vm->thread_index;
uword n_trace = vlib_get_trace_count (vm, node);
- u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ u32 next_index;
const int hdr_sz = vif->virtio_net_hdr_sz;
u32 *to_next = 0;
u32 n_rx_packets = 0;
@@ -275,12 +275,24 @@ virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
u16 mask = vring->size - 1;
u16 last = vring->last_used_idx;
u16 n_left = vring->used->idx - last;
+ vlib_buffer_t bt;
if (n_left == 0)
return 0;
if (type == VIRTIO_IF_TYPE_TUN)
- next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
+ {
+ next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
+ }
+ else
+ {
+ next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
+ next_index = vif->per_interface_next_index;
+
+ /* only for l2, redirect if feature path enabled */
+ vnet_feature_start_device_input_x1 (vif->sw_if_index, &next_index, &bt);
+ }
while (n_left)
{
@@ -361,16 +373,16 @@ virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
next0 = VNET_DEVICE_INPUT_NEXT_DROP;
break;
}
- }
-
- if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
- next0 = vif->per_interface_next_index;
- if (type != VIRTIO_IF_TYPE_TUN)
+ if (PREDICT_FALSE (vif->per_interface_next_index != ~0))
+ next0 = vif->per_interface_next_index;
+ }
+ else
{
- /* only for l2, redirect if feature path enabled */
- vnet_feature_start_device_input_x1 (vif->sw_if_index, &next0,
- b0);
+ /* copy feature arc data from template */
+ b0->current_config_index = bt.current_config_index;
+ vnet_buffer (b0)->feature_arc_index =
+ vnet_buffer (&bt)->feature_arc_index;
}
/* trace */
@@ -397,9 +409,10 @@ virtio_device_input_gso_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
n_left--;
last++;
- /* enqueue */
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
+ /* only tun interfaces may have different next index */
+ if (type == VIRTIO_IF_TYPE_TUN)
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, bi0, next0);
/* next packet */
n_rx_packets++;