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, 300 insertions, 0 deletions

diff --git a/src/vnet/devices/virtio/cli.c b/src/vnet/devices/virtio/cli.c
new file mode 100644
index 00000000000..0c1b75f8c4e
--- /dev/null
+++ b/src/vnet/devices/virtio/cli.c
@@ -0,0 +1,300 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2016 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 <stdint.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <inttypes.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vnet/ethernet/ethernet.h>
+#include <linux/virtio_net.h>
+#include <linux/vhost.h>
+#include <vnet/devices/virtio/virtio.h>
+#include <vnet/devices/virtio/tap.h>
+
+static clib_error_t *
+tap_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
+		       vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  int rv;
+  tap_create_if_args_t args = { 0 };
+
+  /* Get a line of input. */
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return clib_error_return (0, "Missing name <interface>");
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "name %s", &args.name))
+	;
+      else if (unformat (line_input, "host-ns %s", &args.net_ns))
+	;
+      else if (unformat (line_input, "rx-ring-size %d", &args.rx_ring_sz))
+	;
+      else if (unformat (line_input, "tx-ring-size %d", &args.tx_ring_sz))
+	;
+      else if (unformat (line_input, "hw-addr %U",
+			 unformat_ethernet_address, args.hw_addr))
+	args.hw_addr_set = 1;
+      else
+	return clib_error_return (0, "unknown input `%U'",
+				  format_unformat_error, input);
+    }
+  unformat_free (line_input);
+
+  rv = tap_create_if (vm, &args);
+
+  vec_free (args.name);
+
+  if (rv == VNET_API_ERROR_SYSCALL_ERROR_1)
+    return clib_error_return_unix (0, "open '/dev/vhost-net'");
+  else if (rv == VNET_API_ERROR_SYSCALL_ERROR_2)
+    return clib_error_return_unix (0, "open '/dev/net/tun'");
+  else if (rv == VNET_API_ERROR_UNSUPPORTED)
+    return clib_error_return (0, "vhost-net backend doesn't support needed"
+			      " features");
+  else if (rv == VNET_API_ERROR_NAMESPACE_CREATE)
+    return clib_error_return (0, "failed to create netlink namespace");
+  else if (rv == VNET_API_ERROR_VIRTIO_INIT)
+    return clib_error_return (0, "failed to init virtio ring");
+  else if (rv == VNET_API_ERROR_INVALID_REGISTRATION)
+    return clib_error_return (0, "failed to register interface");
+  else if (rv != 0)
+    return clib_error_return (0, "error on creating tap interface");
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (tap_create_command, static) = {
+  .path = "create tap",
+  .short_help = "create tap {name <if-name>} [hw-addr <mac-address>]"
+    "[rx-ring-size <size>] [tx-ring-size <size>] [host-ns <netns>]",
+  .function = tap_create_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+tap_delete_command_fn (vlib_main_t * vm, unformat_input_t * input,
+		       vlib_cli_command_t * cmd)
+{
+  unformat_input_t _line_input, *line_input = &_line_input;
+  u32 sw_if_index = ~0;
+  vnet_main_t *vnm = vnet_get_main ();
+  int rv;
+
+  /* Get a line of input. */
+  if (!unformat_user (input, unformat_line_input, line_input))
+    return clib_error_return (0, "Missing <interface>");
+
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "sw_if_index %d", &sw_if_index))
+	;
+      else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
+			 vnm, &sw_if_index))
+	;
+      else
+	return clib_error_return (0, "unknown input `%U'",
+				  format_unformat_error, input);
+    }
+  unformat_free (line_input);
+
+  if (sw_if_index == ~0)
+    return clib_error_return (0,
+			      "please specify interface name or sw_if_index");
+
+  rv = tap_delete_if (vm, sw_if_index);
+  if (rv == VNET_API_ERROR_INVALID_SW_IF_INDEX)
+    return clib_error_return (0, "not a tap interface");
+  else if (rv != 0)
+    return clib_error_return (0, "error on deleting tap interface");
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (tap_delete__command, static) =
+{
+  .path = "delete tap",
+  .short_help = "delete tap {<interface> | sw_if_index <sw_idx>}",
+  .function = tap_delete_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+tap_show_command_fn (vlib_main_t * vm, unformat_input_t * input,
+		     vlib_cli_command_t * cmd)
+{
+  virtio_main_t *mm = &virtio_main;
+  virtio_if_t *vif;
+  vnet_main_t *vnm = vnet_get_main ();
+  int show_descr = 0;
+  clib_error_t *error = 0;
+  u32 hw_if_index, *hw_if_indices = 0;
+  virtio_vring_t *vring;
+  int i, j;
+  struct feat_struct
+  {
+    u8 bit;
+    char *str;
+  };
+  struct feat_struct *feat_entry;
+
+  static struct feat_struct feat_array[] = {
+#define _(s,b) { .str = #s, .bit = b, },
+    foreach_virtio_net_features
+#undef _
+    {.str = NULL}
+  };
+
+  struct feat_struct *flag_entry;
+  static struct feat_struct flags_array[] = {
+#define _(b,e,s) { .bit = b, .str = s, },
+    foreach_virtio_if_flag
+#undef _
+    {.str = NULL}
+  };
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat
+	  (input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index))
+	vec_add1 (hw_if_indices, hw_if_index);
+      else if (unformat (input, "descriptors"))
+	show_descr = 1;
+      else
+	{
+	  error = clib_error_return (0, "unknown input `%U'",
+				     format_unformat_error, input);
+	  goto done;
+	}
+    }
+
+  if (vec_len (hw_if_indices) == 0)
+    {
+      /* *INDENT-OFF* */
+      pool_foreach (vif, mm->interfaces,
+	  vec_add1 (hw_if_indices, vif->hw_if_index);
+      );
+      /* *INDENT-ON* */
+    }
+
+  for (hw_if_index = 0; hw_if_index < vec_len (hw_if_indices); hw_if_index++)
+    {
+      vnet_hw_interface_t *hi =
+	vnet_get_hw_interface (vnm, hw_if_indices[hw_if_index]);
+      vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
+      vlib_cli_output (vm, "interface %U", format_vnet_sw_if_index_name,
+		       vnm, vif->sw_if_index);
+      if (vif->name)
+	vlib_cli_output (vm, "  name \"%s\"", vif->name);
+      if (vif->net_ns)
+	vlib_cli_output (vm, "  host-ns \"%s\"", vif->net_ns);
+      vlib_cli_output (vm, "  flags 0x%x", vif->flags);
+      flag_entry = (struct feat_struct *) &flags_array;
+      while (flag_entry->str)
+	{
+	  if (vif->flags & (1ULL << flag_entry->bit))
+	    vlib_cli_output (vm, "    %s (%d)", flag_entry->str,
+			     flag_entry->bit);
+	  flag_entry++;
+	}
+      vlib_cli_output (vm, "  fd %d", vif->fd);
+      vlib_cli_output (vm, "  tap-fd %d", vif->tap_fd);
+      vlib_cli_output (vm, "  features 0x%lx", vif->features);
+      feat_entry = (struct feat_struct *) &feat_array;
+      while (feat_entry->str)
+	{
+	  if (vif->features & (1ULL << feat_entry->bit))
+	    vlib_cli_output (vm, "    %s (%d)", feat_entry->str,
+			     feat_entry->bit);
+	  feat_entry++;
+	}
+      vlib_cli_output (vm, "  remote-features 0x%lx", vif->remote_features);
+      feat_entry = (struct feat_struct *) &feat_array;
+      while (feat_entry->str)
+	{
+	  if (vif->remote_features & (1ULL << feat_entry->bit))
+	    vlib_cli_output (vm, "    %s (%d)", feat_entry->str,
+			     feat_entry->bit);
+	  feat_entry++;
+	}
+      vec_foreach_index (i, vif->vrings)
+      {
+	// RX = 0, TX = 1
+	vring = vec_elt_at_index (vif->vrings, i);
+	vlib_cli_output (vm, "  Virtqueue (%s)", (i & 1) ? "TX" : "RX");
+	vlib_cli_output (vm, "    qsz %d, last_used_idx %d, desc_in_use %d",
+			 vring->size, vring->last_used_idx,
+			 vring->desc_in_use);
+	vlib_cli_output (vm,
+			 "    avail.flags 0x%x avail.idx %d used.flags 0x%x used.idx %d",
+			 vring->avail->flags, vring->avail->idx,
+			 vring->used->flags, vring->used->idx);
+	vlib_cli_output (vm, "    kickfd %d, callfd %d", vring->kick_fd,
+			 vring->call_fd);
+	if (show_descr)
+	  {
+	    vlib_cli_output (vm, "\n  descriptor table:\n");
+	    vlib_cli_output (vm,
+			     "   id          addr         len  flags  next      user_addr\n");
+	    vlib_cli_output (vm,
+			     "  ===== ================== ===== ====== ===== ==================\n");
+	    vring = vif->vrings;
+	    for (j = 0; j < vring->size; j++)
+	      {
+		struct vring_desc *desc = &vring->desc[j];
+		vlib_cli_output (vm,
+				 "  %-5d 0x%016lx %-5d 0x%04x %-5d 0x%016lx\n",
+				 j, desc->addr,
+				 desc->len,
+				 desc->flags, desc->next, desc->addr);
+	      }
+	  }
+      }
+    }
+done:
+  vec_free (hw_if_indices);
+  return error;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (tap_show_command, static) = {
+  .path = "show tap",
+  .short_help = "show tap {<interface>] [descriptors]",
+  .function = tap_show_command_fn,
+};
+/* *INDENT-ON* */
+
+clib_error_t *
+tap_cli_init (vlib_main_t * vm)
+{
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (tap_cli_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */