tap gso: experimental support

[vpp.git] / src / vnet / devices / tap / tap.c

diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c
index 101576c..3739561 100644 (file)
--- a/src/vnet/devices/tap/tap.c
+++ b/src/vnet/devices/tap/tap.c
@@ -176,6 +176,16 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
 
   unsigned int offload = 0;
   hdrsz = sizeof (struct virtio_net_hdr_v1);
+  if (args->tap_flags & TAP_FLAG_GSO)
+    {
+      offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
+      vif->gso_enabled = 1;
+    }
+  else
+    {
+      vif->gso_enabled = 0;
+    }
+
   _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
   _IOCTL (vif->tap_fd, TUNSETVNETHDRSZ, &hdrsz);
   _IOCTL (vif->fd, VHOST_SET_OWNER, 0);
@@ -386,6 +396,11 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
   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;
+  if (args->tap_flags & TAP_FLAG_GSO)
+    {
+      hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
+      vnm->interface_main.gso_interface_count++;
+    }
   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);
@@ -442,6 +457,10 @@ tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
   if (vif->type != VIRTIO_IF_TYPE_TAP)
     return VNET_API_ERROR_INVALID_INTERFACE;
 
+  /* decrement if this was a GSO interface */
+  if (hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO)
+    vnm->interface_main.gso_interface_count--;
+
   /* 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);
@@ -466,6 +485,52 @@ tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
   return 0;
 }
 
+int
+tap_gso_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  virtio_main_t *mm = &virtio_main;
+  virtio_if_t *vif;
+  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  clib_error_t *err = 0;
+
+  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);
+
+  const unsigned int gso_on = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
+  const unsigned int gso_off = 0;
+  unsigned int offload = enable_disable ? gso_on : gso_off;
+  _IOCTL (vif->tap_fd, TUNSETOFFLOAD, offload);
+  vif->gso_enabled = enable_disable ? 1 : 0;
+  if (enable_disable)
+    {
+      if ((hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) == 0)
+       {
+         vnm->interface_main.gso_interface_count++;
+         hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
+       }
+    }
+  else
+    {
+      if ((hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) != 0)
+       {
+         vnm->interface_main.gso_interface_count--;
+         hw->flags &= ~VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO;
+       }
+    }
+
+error:
+  if (err)
+    {
+      clib_warning ("Error %s gso on sw_if_index %d",
+                   enable_disable ? "enabling" : "disabling", sw_if_index);
+      return VNET_API_ERROR_SYSCALL_ERROR_3;
+    }
+  return 0;
+}
+
 int
 tap_dump_ifs (tap_interface_details_t ** out_tapids)
 {