tap_v2: move code to vnet/devices/tap

virtio backend stays in vnet/devices/virtio

Change-Id: Idbf04f1c645a809ed408670ba330662859fe9309
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 352 insertions, 0 deletions

diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c
new file mode 100644
index 00000000000..b4004f70189
--- /dev/null
+++ b/src/vnet/devices/tap/tap.c
@@ -0,0 +1,352 @@
+/*
+ *------------------------------------------------------------------
+ * 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include <sys/ioctl.h>
+#include <linux/virtio_net.h>
+#include <linux/vhost.h>
+#include <sys/eventfd.h>
+
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <vlib/vlib.h>
+#include <vlib/unix/unix.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vnet/ip/ip6_packet.h>
+#include <vnet/devices/netlink.h>
+#include <vnet/devices/virtio/virtio.h>
+#include <vnet/devices/tap/tap.h>
+
+#define _IOCTL(fd,a,...) \
+  if (ioctl (fd, a, __VA_ARGS__) < 0) \
+    { \
+      err = clib_error_return_unix (0, "ioctl(" #a ")"); \
+      goto error; \
+    }
+
+static u32
+virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
+			u32 flags)
+{
+  /* nothing for now */
+  //TODO On MTU change call vnet_netlink_set_if_mtu
+  return 0;
+}
+
+void
+tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  virtio_main_t *vim = &virtio_main;
+  vnet_sw_interface_t *sw;
+  vnet_hw_interface_t *hw;
+  int i, fd = -1;
+  struct ifreq ifr;
+  size_t hdrsz;
+  struct vhost_memory *vhost_mem = 0;
+  virtio_if_t *vif = 0;
+  clib_error_t *err = 0;
+
+  memset (&ifr, 0, sizeof (ifr));
+  pool_get (vim->interfaces, vif);
+  vif->dev_instance = vif - vim->interfaces;
+  vif->tap_fd = -1;
+
+  if ((vif->fd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
+    {
+      args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
+      args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
+      goto error;
+    }
+
+  _IOCTL (vif->fd, VHOST_GET_FEATURES, &vif->remote_features);
+
+  if ((vif->remote_features & (1ULL << VIRTIO_NET_F_MRG_RXBUF)) == 0)
+    {
+      args->rv = VNET_API_ERROR_UNSUPPORTED;
+      args->error = clib_error_return (0, "vhost-net backend doesn't support "
+				       "VIRTIO_NET_F_MRG_RXBUF feature");
+      goto error;
+    }
+
+  if ((vif->remote_features & (1ULL << VIRTIO_RING_F_INDIRECT_DESC)) == 0)
+    {
+      args->rv = VNET_API_ERROR_UNSUPPORTED;
+      args->error = clib_error_return (0, "vhost-net backend doesn't support "
+				       "VIRTIO_RING_F_INDIRECT_DESC feature");
+      goto error;
+    }
+
+  if ((vif->remote_features & (1ULL << VIRTIO_F_VERSION_1)) == 0)
+    {
+      args->rv = VNET_API_ERROR_UNSUPPORTED;
+      args->error = clib_error_return (0, "vhost-net backend doesn't support "
+				       "VIRTIO_F_VERSION_1 features");
+      goto error;
+    }
+
+  vif->features |= 1ULL << VIRTIO_NET_F_MRG_RXBUF;
+  vif->features |= 1ULL << VIRTIO_F_VERSION_1;
+  vif->features |= 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
+
+  _IOCTL (vif->fd, VHOST_SET_FEATURES, &vif->features);
+
+  if ((vif->tap_fd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
+    {
+      args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
+      args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
+      goto error;
+    }
+
+  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR;
+  strncpy (ifr.ifr_ifrn.ifrn_name, (char *) args->name, IF_NAMESIZE - 1);
+  _IOCTL (vif->tap_fd, TUNSETIFF, (void *) &ifr);
+
+  vif->ifindex = if_nametoindex ((char *) args->name);
+
+  unsigned int offload = 0;
+  hdrsz = sizeof (struct virtio_net_hdr_v1);
+  _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
+  _IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
+  _IOCTL (vif->fd, VHOST_SET_OWNER, 0);
+
+  if (args->host_bridge)
+    {
+      int master_ifindex = if_nametoindex ((char *) args->host_bridge);
+      args->error = vnet_netlink_set_if_master (vif->ifindex, master_ifindex);
+      if (args->error)
+	{
+	  args->rv = VNET_API_ERROR_NETLINK_ERROR;
+	  goto error;
+	}
+    }
+
+  if (args->host_namespace)
+    {
+      args->error = vnet_netlink_set_if_namespace (vif->ifindex,
+						   (char *)
+						   args->host_namespace);
+      if (args->error)
+	{
+	  args->rv = VNET_API_ERROR_NETLINK_ERROR;
+	  goto error;
+	}
+    }
+
+  if (args->host_ip4_prefix_len)
+    {
+      args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
+					       &args->host_ip4_addr,
+					       args->host_ip4_prefix_len);
+      if (args->error)
+	{
+	  args->rv = VNET_API_ERROR_NETLINK_ERROR;
+	  goto error;
+	}
+    }
+
+  if (args->host_ip6_prefix_len)
+    {
+      args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
+					       &args->host_ip6_addr,
+					       args->host_ip6_prefix_len);
+      if (args->error)
+	{
+	  args->rv = VNET_API_ERROR_NETLINK_ERROR;
+	  goto error;
+	}
+    }
+
+  /* Set vhost memory table */
+  i = sizeof (struct vhost_memory) + sizeof (struct vhost_memory_region);
+  vhost_mem = clib_mem_alloc (i);
+  memset (vhost_mem, 0, i);
+  vhost_mem->nregions = 1;
+  vhost_mem->regions[0].memory_size = (1ULL << 47) - 4096;
+  _IOCTL (vif->fd, VHOST_SET_MEM_TABLE, vhost_mem);
+
+  if ((args->error = virtio_vring_init (vm, vif, 0, args->rx_ring_sz)))
+    {
+      args->rv = VNET_API_ERROR_INIT_FAILED;
+      goto error;
+    }
+
+  if ((args->error = virtio_vring_init (vm, vif, 1, args->tx_ring_sz)))
+    {
+      args->rv = VNET_API_ERROR_INIT_FAILED;
+      goto error;
+    }
+
+  /* set host side up */
+  if ((fd = socket (AF_INET, SOCK_STREAM, 0)) > 0)
+    {
+      memset (&ifr, 0, sizeof (struct ifreq));
+      strncpy (ifr.ifr_name, (char *) args->name, sizeof (ifr.ifr_name) - 1);
+      _IOCTL (fd, SIOCGIFFLAGS, (void *) &ifr);
+      ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
+      _IOCTL (fd, SIOCSIFFLAGS, (void *) &ifr);
+    }
+
+  if (!args->hw_addr_set)
+    {
+      f64 now = vlib_time_now (vm);
+      u32 rnd;
+      rnd = (u32) (now * 1e6);
+      rnd = random_u32 (&rnd);
+
+      memcpy (args->hw_addr + 2, &rnd, sizeof (rnd));
+      args->hw_addr[0] = 2;
+      args->hw_addr[1] = 0xfe;
+    }
+  vif->name = args->name;
+  args->name = 0;
+  vif->net_ns = args->host_namespace;
+  args->host_namespace = 0;
+  args->error = ethernet_register_interface (vnm, virtio_device_class.index,
+					     vif->dev_instance, args->hw_addr,
+					     &vif->hw_if_index,
+					     virtio_eth_flag_change);
+  if (args->error)
+    {
+      args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
+      goto error;
+    }
+
+  sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
+  vif->sw_if_index = sw->sw_if_index;
+  args->sw_if_index = vif->sw_if_index;
+  hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
+  hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+  vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
+				    virtio_input_node.index);
+  vnet_hw_interface_assign_rx_thread (vnm, vif->hw_if_index, 0, ~0);
+  vnet_hw_interface_set_rx_mode (vnm, vif->hw_if_index, 0,
+				 VNET_HW_INTERFACE_RX_MODE_DEFAULT);
+  vif->per_interface_next_index = ~0;
+  vif->type = VIRTIO_IF_TYPE_TAP;
+  vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
+  vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
+			       VNET_HW_INTERFACE_FLAG_LINK_UP);
+  goto done;
+
+error:
+  if (err)
+    {
+      ASSERT (args->error == 0);
+      args->error = err;
+      args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
+    }
+  if (vif->tap_fd != -1)
+    close (vif->tap_fd);
+  if (vif->fd != -1)
+    close (vif->fd);
+  vec_foreach_index (i, vif->vrings) virtio_vring_free (vif, i);
+  memset (vif, 0, sizeof (virtio_if_t));
+  pool_put (vim->interfaces, vif);
+
+done:
+  if (vhost_mem)
+    clib_mem_free (vhost_mem);
+  if (fd != -1)
+    close (fd);
+}
+
+int
+tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  virtio_main_t *mm = &virtio_main;
+  int i;
+  virtio_if_t *vif;
+  vnet_hw_interface_t *hw;
+
+  hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
+    return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+  vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
+
+  /* bring down the interface */
+  vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
+  vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
+
+  ethernet_delete_interface (vnm, vif->hw_if_index);
+  vif->hw_if_index = ~0;
+
+  if (vif->tap_fd != -1)
+    close (vif->tap_fd);
+  if (vif->fd != -1)
+    close (vif->fd);
+
+  vec_foreach_index (i, vif->vrings) virtio_vring_free (vif, i);
+  vec_free (vif->vrings);
+
+  memset (vif, 0, sizeof (*vif));
+  pool_put (mm->interfaces, vif);
+
+  return 0;
+}
+
+int
+tap_dump_ifs (tap_interface_details_t ** out_tapids)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  virtio_main_t *mm = &virtio_main;
+  virtio_if_t *vif;
+  vnet_hw_interface_t *hi;
+  tap_interface_details_t *r_tapids = NULL;
+  tap_interface_details_t *tapid = NULL;
+
+  /* *INDENT-OFF* */
+  pool_foreach (vif, mm->interfaces,
+    vec_add2(r_tapids, tapid, 1);
+    memset (tapid, 0, sizeof (*tapid));
+    tapid->sw_if_index = vif->sw_if_index;
+    hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
+    clib_memcpy(tapid->dev_name, hi->name,
+		MIN (ARRAY_LEN (tapid->dev_name) - 1,
+		     strlen ((const char *) hi->name)));
+  );
+  /* *INDENT-ON* */
+
+  *out_tapids = r_tapids;
+
+  return 0;
+}
+
+static clib_error_t *
+tap_init (vlib_main_t * vm)
+{
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (tap_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */