virtio_process.c

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/*
 *------------------------------------------------------------------
 * Copyright (c) 2020 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <vlib/vlib.h>
#include <vnet/devices/virtio/virtio.h>
#include <vnet/gso/gro_func.h>

static uword
virtio_send_interrupt_process (vlib_main_t * vm,
                               vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  virtio_if_t *vif;
  f64 timeout = 3153600000.0 /* 100 years */ ;
  uword event_type, *event_data = 0;
  virtio_main_t *vim = &virtio_main;

  while (1)
    {
      vlib_process_wait_for_event_or_clock (vm, timeout);
      event_type = vlib_process_get_events (vm, &event_data);
      vec_reset_length (event_data);

      switch (event_type)
        {
        case VIRTIO_EVENT_STOP_TIMER:
          timeout = 3153600000.0;
          break;

        case VIRTIO_EVENT_START_TIMER:
          timeout = 1e-3;       /* 1 millisecond */
          break;

        case ~0:
          /* *INDENT-OFF* */
          pool_foreach (vif, vim->interfaces) {
              if (vif->packet_coalesce || vif->packet_buffering)
                {
                  virtio_vring_t *vring;
                  vec_foreach (vring, vif->rxq_vrings)
                  {
                    if (vring->mode == VNET_HW_IF_RX_MODE_INTERRUPT ||
                        vring->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)
                      vnet_device_input_set_interrupt_pending (
                                             vnet_get_main (), vif->hw_if_index,
                                             RX_QUEUE_ACCESS (vring->queue_id));
                  }
                }
          }
          /* *INDENT-ON* */
          break;

        default:
          clib_warning ("BUG: unhandled event type %d", event_type);
          break;
        }
    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (virtio_send_interrupt_node) = {
    .function = virtio_send_interrupt_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "virtio-send-interrupt-process",
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */