api: L2 XConnect API (VPP-438)

Change-Id: I0a86184391723675488a5eb517c375f67940f5b5
Signed-off-by: Matus Fabian <matfabia@cisco.com>

4 files changed, 185 insertions, 3 deletions

diff --git a/vnet/Makefile.am b/vnet/Makefile.am
index 7d6abc60..fc91bcd2 100644
--- a/vnet/Makefile.am
+++ b/vnet/Makefile.am
@@ -15,7 +15,8 @@ AUTOMAKE_OPTIONS = foreign subdir-objects
 
 AM_CFLAGS = -Wall -Werror @DPDK@ @DPDK_CRYPTO@ @IPSEC@ @IPV6SR@
 
-BUILT_SOURCES = vnet/interface.api.h vnet/interface.api.json
+BUILT_SOURCES = vnet/interface.api.h vnet/interface.api.json vnet/l2/l2.api.h \
+  vnet/l2/l2.api.json
 
 libvnet_la_SOURCES =
 libvnetplugin_la_SOURCES =
@@ -116,6 +117,7 @@ nobase_include_HEADERS +=			\
 ########################################
 libvnet_la_SOURCES +=				\
  vnet/l2/feat_bitmap.c				\
+ vnet/l2/l2_api.c      				\
  vnet/l2/l2_bd.c				\
  vnet/l2/l2_bvi.c				\
  vnet/l2/l2_input_classify.c			\
@@ -149,7 +151,8 @@ nobase_include_HEADERS +=			\
  vnet/l2/l2_fib.h				\
  vnet/l2/l2_rw.h                                \
  vnet/l2/l2_xcrw.h				\
- vnet/l2/l2_classify.h
+ vnet/l2/l2_classify.h				\
+ vnet/l2/l2.api.h
 
 ########################################
 # Layer 2 protocol: SRP
@@ -892,7 +895,7 @@ SUFFIXES = .api.h .api .api.json
 # install the API definition, so we can produce java bindings, etc.
 
 apidir = $(prefix)/vnet
-api_DATA = vnet/interface.api.json
+api_DATA = vnet/interface.api.json vnet/l2/l2.api.json
 
 # The actual %.api.h rule is in .../build-data/packages/suffix-rules.mk
 # and requires a symbolic link at the top of the vnet source tree
diff --git a/vnet/vnet/l2/l2.api b/vnet/vnet/l2/l2.api
new file mode 100644
index 00000000..5fce7944
--- /dev/null
+++ b/vnet/vnet/l2/l2.api
@@ -0,0 +1,38 @@
+/* Hey Emacs use -*- mode: C -*- */
+/*
+ * 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.
+ */
+
+/** \brief Reply to l2_xconnect_dump 
+    @param context - sender context which was passed in the request
+    @param rx_sw_if_index - Receive interface index
+    @param tx_sw_if_index - Transmit interface index
+ */
+define l2_xconnect_details
+{
+  u32 context;
+  u32 rx_sw_if_index;
+  u32 tx_sw_if_index;
+};
+
+/** \brief Dump L2 XConnects
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+*/
+define l2_xconnect_dump
+{
+  u32 client_index;
+  u32 context;
+};
+
diff --git a/vnet/vnet/l2/l2_api.c b/vnet/vnet/l2/l2_api.c
new file mode 100644
index 00000000..ca4f593f
--- /dev/null
+++ b/vnet/vnet/l2/l2_api.c
@@ -0,0 +1,140 @@
+/*
+ *------------------------------------------------------------------
+ * l2_api.c - layer 2 forwarding api
+ *
+ * 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 <vnet/vnet.h>
+#include <vlibmemory/api.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+#include <vnet/l2/l2_input.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>
+
+#define foreach_vpe_api_msg                             \
+_(L2_XCONNECT_DUMP, l2_xconnect_dump)
+
+static void
+send_l2_xconnect_details (unix_shared_memory_queue_t * q, u32 context,
+			  u32 rx_sw_if_index, u32 tx_sw_if_index)
+{
+  vl_api_l2_xconnect_details_t *mp;
+
+  mp = vl_msg_api_alloc (sizeof (*mp));
+  memset (mp, 0, sizeof (*mp));
+  mp->_vl_msg_id = ntohs (VL_API_L2_XCONNECT_DETAILS);
+  mp->context = context;
+  mp->rx_sw_if_index = htonl (rx_sw_if_index);
+  mp->tx_sw_if_index = htonl (tx_sw_if_index);
+
+  vl_msg_api_send_shmem (q, (u8 *) & mp);
+}
+
+static void
+vl_api_l2_xconnect_dump_t_handler (vl_api_l2_xconnect_dump_t * mp)
+{
+  unix_shared_memory_queue_t *q;
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_interface_main_t *im = &vnm->interface_main;
+  l2input_main_t *l2im = &l2input_main;
+  vnet_sw_interface_t *swif;
+  l2_input_config_t *config;
+
+  q = vl_api_client_index_to_input_queue (mp->client_index);
+  if (q == 0)
+    return;
+
+  /* *INDENT-OFF* */
+  pool_foreach (swif, im->sw_interfaces,
+  ({
+    config = vec_elt_at_index (l2im->configs, swif->sw_if_index);
+    if (config->xconnect)
+      send_l2_xconnect_details (q, mp->context, swif->sw_if_index,
+                                config->output_sw_if_index);
+  }));
+  /* *INDENT-ON* */
+}
+
+
+/*
+ * vpe_api_hookup
+ * Add vpe's API message handlers to the table.
+ * vlib has alread mapped shared memory and
+ * added the client registration handlers.
+ * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
+ */
+#define vl_msg_name_crc_list
+#include <vnet/vnet_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+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_l2;
+#undef _
+}
+
+static clib_error_t *
+l2_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_vpe_api_msg;
+#undef _
+
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  setup_message_id_table (am);
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (l2_api_hookup);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/vnet/vnet/vnet_all_api_h.h b/vnet/vnet/vnet_all_api_h.h
index 0dacdc1f..b975f93a 100644
--- a/vnet/vnet/vnet_all_api_h.h
+++ b/vnet/vnet/vnet_all_api_h.h
@@ -30,6 +30,7 @@
 #endif /* included_from_layer_3 */
 
 #include <vnet/interface.api.h>
+#include <vnet/l2/l2.api.h>
 
 /*
  * fd.io coding-style-patch-verification: ON