vnet: add device-input threadplacement infra

This change adds two new debug CLI command:

- "show interface placmenet" to display which
thread (main or worker) is responsible for processing
interface rx queue

vpp# show interface placement
Thread 0 (vpp_main):
  node af-packet-input:
    host-vpp1 queue 0
Thread 1 (vpp_wk_0):
  node af-packet-input:
    host-virbr0 queue 0
Thread 2 (vpp_wk_1):
  node af-packet-input:
    host-vpp2 queue 0
    host-lxcbr0 queue 0

- "set interface placmenet" to assign thread (main or worker)
which process specific interface rx queue

vpp# set interface placement host-vpp1 queue 0 main

Change-Id: Id4dd00cf2b05e10fae2125ac7cb4411b446c5e9c
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 9 insertions, 14 deletions

diff --git a/src/vnet/devices/af_packet/node.c b/src/vnet/devices/af_packet/node.c
index ab7fd80005f..ba337f3f70b 100644
--- a/src/vnet/devices/af_packet/node.c
+++ b/src/vnet/devices/af_packet/node.c
@@ -246,20 +246,18 @@ static uword
 af_packet_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		    vlib_frame_t * frame)
 {
-  int i;
   u32 n_rx_packets = 0;
-  u32 cpu_index = os_get_cpu_number ();
   af_packet_main_t *apm = &af_packet_main;
-  af_packet_if_t *apif;
+  vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
+  vnet_device_and_queue_t *dq;
 
-  for (i = 0; i < vec_len (apm->interfaces); i++)
-    {
-      apif = vec_elt_at_index (apm->interfaces, i);
-      if (apif->is_admin_up &&
-	  (i % apm->input_cpu_count) ==
-	  (cpu_index - apm->input_cpu_first_index))
-	n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif);
-    }
+  vec_foreach (dq, rt->devices_and_queues)
+  {
+    af_packet_if_t *apif;
+    apif = vec_elt_at_index (apm->interfaces, dq->dev_instance);
+    if (apif->is_admin_up)
+      n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif);
+  }
 
   return n_rx_packets;
 }
@@ -271,9 +269,6 @@ VLIB_REGISTER_NODE (af_packet_input_node) = {
   .sibling_of = "device-input",
   .format_trace = format_af_packet_input_trace,
   .type = VLIB_NODE_TYPE_INPUT,
-  /**
-   * default state is INTERRUPT mode, switch to POLLING if worker threads are enabled
-   */
   .state = VLIB_NODE_STATE_INTERRUPT,
   .n_errors = AF_PACKET_INPUT_N_ERROR,
   .error_strings = af_packet_input_error_strings,