src/vnet/devices/devices.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <vnet/vnet.h>
  17 #include <vnet/devices/devices.h>
  18 #include <vnet/feature/feature.h>
  19 #include <vnet/ip/ip.h>
  20 #include <vnet/ethernet/ethernet.h>
  21 #include <vlib/stats/stats.h>
  22
  23 vnet_device_main_t vnet_device_main;
  24
  25 static uword
  26 device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
  27                  vlib_frame_t * frame)
  28 {
  29   return 0;
  30 }
  31
  32 /* *INDENT-OFF* */
  33 VLIB_REGISTER_NODE (device_input_node) = {
  34   .function = device_input_fn,
  35   .name = "device-input",
  36   .runtime_data_bytes = sizeof (vnet_hw_if_rx_node_runtime_t),
  37   .type = VLIB_NODE_TYPE_INPUT,
  38   .state = VLIB_NODE_STATE_DISABLED,
  39   .n_next_nodes = VNET_DEVICE_INPUT_N_NEXT_NODES,
  40   .next_nodes = VNET_DEVICE_INPUT_NEXT_NODES,
  41 };
  42
  43 /* Table defines how much we need to advance current data pointer
  44    in the buffer if we shortcut to l3 nodes */
  45
  46 const u32 __attribute__((aligned (CLIB_CACHE_LINE_BYTES)))
  47 device_input_next_node_advance[((VNET_DEVICE_INPUT_N_NEXT_NODES /
  48                                 CLIB_CACHE_LINE_BYTES) +1) * CLIB_CACHE_LINE_BYTES] =
  49 {
  50       [VNET_DEVICE_INPUT_NEXT_IP4_INPUT] = sizeof (ethernet_header_t),
  51       [VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT] = sizeof (ethernet_header_t),
  52       [VNET_DEVICE_INPUT_NEXT_IP6_INPUT] = sizeof (ethernet_header_t),
  53       [VNET_DEVICE_INPUT_NEXT_MPLS_INPUT] = sizeof (ethernet_header_t),
  54 };
  55
  56 const u32 __attribute__((aligned (CLIB_CACHE_LINE_BYTES)))
  57 device_input_next_node_flags[((VNET_DEVICE_INPUT_N_NEXT_NODES /
  58                                 CLIB_CACHE_LINE_BYTES) +1) * CLIB_CACHE_LINE_BYTES] =
  59 {
  60       [VNET_DEVICE_INPUT_NEXT_IP4_INPUT] = VNET_BUFFER_F_L3_HDR_OFFSET_VALID,
  61       [VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT] = VNET_BUFFER_F_L3_HDR_OFFSET_VALID,
  62       [VNET_DEVICE_INPUT_NEXT_IP6_INPUT] = VNET_BUFFER_F_L3_HDR_OFFSET_VALID,
  63       [VNET_DEVICE_INPUT_NEXT_MPLS_INPUT] = VNET_BUFFER_F_L3_HDR_OFFSET_VALID,
  64 };
  65
  66 VNET_FEATURE_ARC_INIT (device_input, static) =
  67 {
  68   .arc_name  = "device-input",
  69   .start_nodes = VNET_FEATURES ("device-input"),
  70   .last_in_arc = "ethernet-input",
  71   .arc_index_ptr = &feature_main.device_input_feature_arc_index,
  72 };
  73
  74 VNET_FEATURE_INIT (l2_patch, static) = {
  75   .arc_name = "device-input",
  76   .node_name = "l2-patch",
  77   .runs_before = VNET_FEATURES ("ethernet-input"),
  78 };
  79
  80 VNET_FEATURE_INIT (worker_handoff, static) = {
  81   .arc_name = "device-input",
  82   .node_name = "worker-handoff",
  83   .runs_before = VNET_FEATURES ("ethernet-input"),
  84 };
  85
  86 VNET_FEATURE_INIT (span_input, static) = {
  87   .arc_name = "device-input",
  88   .node_name = "span-input",
  89   .runs_before = VNET_FEATURES ("ethernet-input"),
  90 };
  91
  92 VNET_FEATURE_INIT (p2p_ethernet_node, static) = {
  93   .arc_name = "device-input",
  94   .node_name = "p2p-ethernet-input",
  95   .runs_before = VNET_FEATURES ("ethernet-input"),
  96 };
  97
  98 VNET_FEATURE_INIT (ethernet_input, static) = {
  99   .arc_name = "device-input",
 100   .node_name = "ethernet-input",
 101   .runs_before = 0, /* not before any other features */
 102 };
 103 /* *INDENT-ON* */
 104
 105 static void
 106 input_rate_collector_fn (vlib_stats_collector_data_t *d)
 107 {
 108   vlib_stats_segment_t *sm = vlib_stats_get_segment ();
 109   vlib_stats_entry_t *e2 = sm->directory_vector + d->private_data;
 110   static u64 last_input_packets = 0;
 111   f64 dt, now;
 112
 113   now = vlib_time_now (vlib_get_main ());
 114   u64 input_packets = vnet_get_aggregate_rx_packets ();
 115
 116   dt = now - e2->value;
 117   d->entry->value = (f64) (input_packets - last_input_packets) / dt;
 118   last_input_packets = input_packets;
 119   e2->value = now;
 120 }
 121
 122 static clib_error_t *
 123 vnet_device_init (vlib_main_t * vm)
 124 {
 125   vnet_device_main_t *vdm = &vnet_device_main;
 126   vlib_thread_main_t *tm = vlib_get_thread_main ();
 127   vlib_thread_registration_t *tr;
 128   vlib_stats_collector_reg_t reg = {};
 129   uword *p;
 130
 131   vec_validate_aligned (vdm->workers, tm->n_vlib_mains - 1,
 132                         CLIB_CACHE_LINE_BYTES);
 133
 134   p = hash_get_mem (tm->thread_registrations_by_name, "workers");
 135   tr = p ? (vlib_thread_registration_t *) p[0] : 0;
 136   if (tr && tr->count > 0)
 137     {
 138       vdm->first_worker_thread_index = tr->first_index;
 139       vdm->next_worker_thread_index = tr->first_index;
 140       vdm->last_worker_thread_index = tr->first_index + tr->count - 1;
 141     }
 142
 143   reg.private_data = vlib_stats_add_timestamp ("/sys/last_update");
 144   reg.entry_index = vlib_stats_add_gauge ("/sys/input_rate");
 145   reg.collect_fn = input_rate_collector_fn;
 146   vlib_stats_register_collector_fn (&reg);
 147
 148   return 0;
 149 }
 150
 151 VLIB_INIT_FUNCTION (vnet_device_init);
 152
 153 /*
 154  * fd.io coding-style-patch-verification: ON
 155  *
 156  * Local Variables:
 157  * eval: (c-set-style "gnu")
 158  * End:
 159  */