virtio: fast TAP interfaces with vhost-net backend

Change-Id: Ided667356d5c6fb9648eb34685aabd6b16a598b7
Signed-off-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Steven Luong <sluong@cisco.com>

1 files changed, 222 insertions, 0 deletions

diff --git a/src/vnet/devices/virtio/tapv2_api.c b/src/vnet/devices/virtio/tapv2_api.c
new file mode 100644
index 00000000000..1c559e6c28e
--- /dev/null
+++ b/src/vnet/devices/virtio/tapv2_api.c
@@ -0,0 +1,222 @@
+/*
+ *------------------------------------------------------------------
+ * tap_api.c - vnet tap device driver API support
+ *
+ * Copyright (c) 2017 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 <vnet/vnet.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip.h>
+
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+#include <vnet/devices/virtio/tap.h>
+
+#define foreach_tapv2_api_msg                     \
+_(TAP_CREATE_V2, tap_create_v2)                   \
+_(TAP_DELETE_V2, tap_delete_v2)                   \
+_(SW_INTERFACE_TAP_V2_DUMP, sw_interface_tap_v2_dump)
+
+static void
+vl_api_tap_create_v2_t_handler (vl_api_tap_create_v2_t * mp)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  int rv;
+  vl_api_tap_create_v2_reply_t *rmp;
+  unix_shared_memory_queue_t *q;
+  tap_create_if_args_t _a, *ap = &_a;
+
+  memset (ap, 0, sizeof (*ap));
+
+  ap->name = mp->tap_name;
+  if (!mp->use_random_mac)
+    {
+      clib_memcpy (ap->hw_addr, mp->mac_address, 6);
+      ap->hw_addr_set = 1;
+    }
+  ap->rx_ring_sz = mp->rx_ring_sz;
+  ap->tx_ring_sz = mp->tx_ring_sz;
+  ap->sw_if_index = (u32) ~ 0;
+  if (mp->net_ns_set)
+    ap->net_ns = mp->net_ns;
+
+  rv = tap_create_if (vm, ap);
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (!q)
+    return;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_TAP_CREATE_V2_REPLY);
+  rmp->context = mp->context;
+  rmp->retval = ntohl (rv);
+  rmp->sw_if_index = ntohl (ap->sw_if_index);
+
+  vl_msg_api_send_shmem (q, (u8 *) & rmp);
+}
+
+static void
+tap_send_sw_interface_event_deleted (vpe_api_main_t * am,
+				     unix_shared_memory_queue_t * q,
+				     u32 sw_if_index)
+{
+  vl_api_sw_interface_event_t *mp;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_SW_INTERFACE_EVENT);
+  mp->sw_if_index = ntohl (sw_if_index);
+
+  mp->admin_up_down = 0;
+  mp->link_up_down = 0;
+  mp->deleted = 1;
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+static void
+vl_api_tap_delete_v2_t_handler (vl_api_tap_delete_v2_t * mp)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  int rv;
+  vpe_api_main_t *vam = &vpe_api_main;
+  vl_api_tap_delete_v2_reply_t *rmp;
+  unix_shared_memory_queue_t *q;
+  u32 sw_if_index = ntohl (mp->sw_if_index);
+
+  rv = tap_delete_if (vm, sw_if_index);
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (!q)
+    return;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (VL_API_TAP_DELETE_V2_REPLY);
+  rmp->context = mp->context;
+  rmp->retval = ntohl (rv);
+
+  vl_msg_api_send_shmem (q, (u8 *) & rmp);
+
+  if (!rv)
+    tap_send_sw_interface_event_deleted (vam, q, sw_if_index);
+}
+
+static void
+tap_send_sw_interface_details (vpe_api_main_t * am,
+			       unix_shared_memory_queue_t * q,
+			       tap_interface_details_t * tap_if, u32 context)
+{
+  vl_api_sw_interface_tap_v2_details_t *mp;
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_SW_INTERFACE_TAP_V2_DETAILS);
+  mp->sw_if_index = ntohl (tap_if->sw_if_index);
+  clib_memcpy (mp->dev_name, tap_if->dev_name,
+	       MIN (ARRAY_LEN (mp->dev_name) - 1,
+		    strlen ((const char *) tap_if->dev_name)));
+  mp->context = context;
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+static void
+vl_api_sw_interface_tap_v2_dump_t_handler (vl_api_sw_interface_tap_v2_dump_t *
+					   mp)
+{
+  int rv;
+  vpe_api_main_t *am = &vpe_api_main;
+  unix_shared_memory_queue_t *q;
+  tap_interface_details_t *tapifs = NULL;
+  tap_interface_details_t *tap_if = NULL;
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (q == 0)
+    return;
+
+  rv = tap_dump_ifs (&tapifs);
+  if (rv)
+    return;
+
+  vec_foreach (tap_if, tapifs)
+  {
+    tap_send_sw_interface_details (am, q, tap_if, mp->context);
+  }
+
+  vec_free (tapifs);
+}
+
+#define vl_msg_name_crc_list
+#include <vnet/vnet_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+tap_setup_message_id_table (api_main_t * am)
+{
+#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
+  foreach_vl_msg_name_crc_tapv2;
+#undef _
+}
+
+static clib_error_t *
+tapv2_api_hookup (vlib_main_t * vm)
+{
+  api_main_t *am = &api_main;
+
+#define _(N,n)                                                  \
+    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
+                           vl_api_##n##_t_handler,              \
+                           vl_noop_handler,                     \
+                           vl_api_##n##_t_endian,               \
+                           vl_api_##n##_t_print,                \
+                           sizeof(vl_api_##n##_t), 1);
+  foreach_tapv2_api_msg;
+#undef _
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  tap_setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (tapv2_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */