vnet: device flow offload infra

Change-Id: Ibea4a96bdec5e368301a03d8b11a0712fa0265e0
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/vnet/flow/flow.c b/src/vnet/flow/flow.c
new file mode 100644
index 00000000000..91e51120a7e
--- /dev/null
+++ b/src/vnet/flow/flow.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2018 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 <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/flow/flow.h>
+
+vnet_flow_main_t flow_main;
+
+int
+vnet_flow_get_range (vnet_main_t * vnm, char *owner, u32 count, u32 * start)
+{
+  vnet_flow_main_t *fm = &flow_main;
+  vnet_flow_range_t *r;
+
+  /* skip 0 */
+  if (fm->flows_used == 0)
+    fm->flows_used = 1;
+
+  *start = fm->flows_used;
+  fm->flows_used += count;
+  vec_add2 (fm->ranges, r, 1);
+  r->start = *start;
+  r->count = count;
+  r->owner = format (0, "%s%c", owner, 0);
+  return 0;
+}
+
+int
+vnet_flow_add (vnet_main_t * vnm, vnet_flow_t * flow, u32 * flow_index)
+{
+  vnet_flow_main_t *fm = &flow_main;
+  vnet_flow_t *f;
+
+  pool_get (fm->global_flow_pool, f);
+  *flow_index = f - fm->global_flow_pool;
+  clib_memcpy (f, flow, sizeof (vnet_flow_t));
+  f->private_data = 0;
+  f->index = *flow_index;
+  return 0;
+}
+
+vnet_flow_t *
+vnet_get_flow (u32 flow_index)
+{
+  vnet_flow_main_t *fm = &flow_main;
+  if (pool_is_free_index (fm->global_flow_pool, flow_index))
+    return 0;
+
+  return pool_elt_at_index (fm->global_flow_pool, flow_index);
+}
+
+int
+vnet_flow_del (vnet_main_t * vnm, u32 flow_index)
+{
+  vnet_flow_main_t *fm = &flow_main;
+  vnet_flow_t *f = vnet_get_flow (flow_index);
+  uword hw_if_index;
+  uword private_data;
+
+  if (f == 0)
+    return VNET_FLOW_ERROR_NO_SUCH_ENTRY;
+
+  /* *INDENT-OFF* */
+  hash_foreach (hw_if_index, private_data, f->private_data,
+    ({
+     vnet_flow_disable (vnm, flow_index, hw_if_index);
+    }));
+  /* *INDENT-ON* */
+
+  hash_free (f->private_data);
+  memset (f, 0, sizeof (*f));
+  pool_put (fm->global_flow_pool, f);
+  return 0;
+}
+
+int
+vnet_flow_enable (vnet_main_t * vnm, u32 flow_index, u32 hw_if_index)
+{
+  vnet_flow_t *f = vnet_get_flow (flow_index);
+  vnet_hw_interface_t *hi;
+  vnet_device_class_t *dev_class;
+  uword private_data;
+  int rv;
+
+  if (!vnet_hw_interface_is_valid (vnm, hw_if_index))
+    return VNET_FLOW_ERROR_NO_SUCH_INTERFACE;
+
+  /* don't enable flow twice */
+  if (hash_get (f->private_data, hw_if_index) != 0)
+    return VNET_FLOW_ERROR_ALREADY_DONE;
+
+  hi = vnet_get_hw_interface (vnm, hw_if_index);
+  dev_class = vnet_get_device_class (vnm, hi->dev_class_index);
+
+  if (dev_class->flow_ops_function == 0)
+    return VNET_FLOW_ERROR_NOT_SUPPORTED;
+
+  rv = dev_class->flow_ops_function (vnm, VNET_FLOW_DEV_OP_ADD_FLOW,
+				     hi->dev_instance, flow_index,
+				     &private_data);
+
+  if (rv)
+    return rv;
+
+  hash_set (f->private_data, hw_if_index, private_data);
+  return 0;
+}
+
+int
+vnet_flow_disable (vnet_main_t * vnm, u32 flow_index, u32 hw_if_index)
+{
+  vnet_flow_t *f = vnet_get_flow (flow_index);
+  vnet_hw_interface_t *hi;
+  vnet_device_class_t *dev_class;
+  uword *p;
+  int rv;
+
+  if (!vnet_hw_interface_is_valid (vnm, hw_if_index))
+    return VNET_FLOW_ERROR_NO_SUCH_INTERFACE;
+
+  /* don't disable if not enabled */
+  if ((p = hash_get (f->private_data, hw_if_index)) == 0)
+    return VNET_FLOW_ERROR_ALREADY_DONE;
+
+  hi = vnet_get_hw_interface (vnm, hw_if_index);
+  dev_class = vnet_get_device_class (vnm, hi->dev_class_index);
+
+  rv = dev_class->flow_ops_function (vnm, VNET_FLOW_DEV_OP_DEL_FLOW,
+				     hi->dev_instance, flow_index, p);
+
+  if (rv)
+    return rv;
+
+  hash_unset (f->private_data, hw_if_index);
+  return 0;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */