sr: srv6 path tracing api

Implements the API for SRv6 Path Tracing

Type: feature

Signed-off-by: Julian Klaiber <julian@klaiber.me>
Change-Id: Iefa7e512c8e1894595a9e3f5d42eab4160db1f28

3 files changed, 158 insertions, 0 deletions

diff --git a/src/vnet/srv6/sr_pt.api b/src/vnet/srv6/sr_pt.api
new file mode 100644
index 00000000000..e86359b421f
--- /dev/null
+++ b/src/vnet/srv6/sr_pt.api
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright(c) 2022 Cisco Systems, Inc.
+ */
+
+option version = "1.0.0";
+
+import "vnet/interface_types.api";
+
+/** \brief SR PT iface dump request
+    @param client_index - opaque cookie to identifty the sender
+    @param context - sender context, to match reply w/ request
+*/
+define sr_pt_iface_dump
+{
+  u32 client_index;
+  u32 context;
+};
+
+define sr_pt_iface_details
+{
+  u32 context;
+  vl_api_interface_index_t sw_if_index;
+  u16 id;
+  u8 ingress_load;
+  u8 egress_load;
+  u8 tts_template;
+};
+
+/** \brief SR PT iface add request
+    @param client_index - opaque cookie to identifty the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - index of the interface to add to SR PT
+    @param id - SR PT interface id
+    @param ingress_load - incoming interface load
+    @param egress_load - outgoing interface load
+    @param tts_template - truncated timestamp template to use
+*/
+autoreply define sr_pt_iface_add
+{
+  u32 client_index;
+  u32 context;
+  vl_api_interface_index_t sw_if_index;
+  u16 id;
+  u8 ingress_load;
+  u8 egress_load;
+  u8 tts_template;
+};
+
+/** \brief SR PT iface del request
+    @param client_index - opaque cookie to identifty the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - index of the interface to delete from SR PT
+*/
+autoreply define sr_pt_iface_del
+{
+  u32 client_index;
+  u32 context;
+  vl_api_interface_index_t sw_if_index;
+};
\ No newline at end of file
diff --git a/src/vnet/srv6/sr_pt.h b/src/vnet/srv6/sr_pt.h
index cd70cd09ad2..53001e10ac7 100644
--- a/src/vnet/srv6/sr_pt.h
+++ b/src/vnet/srv6/sr_pt.h
@@ -75,6 +75,8 @@ typedef struct
   /* Hash table for sr_pt_iface parameters */
   mhash_t sr_pt_iface_index_hash;
 
+  /* convenience */
+  u16 msg_id_base;
 } sr_pt_main_t;
 
 extern sr_pt_main_t sr_pt_main;
diff --git a/src/vnet/srv6/sr_pt_api.c b/src/vnet/srv6/sr_pt_api.c
new file mode 100644
index 00000000000..b0b67a210fb
--- /dev/null
+++ b/src/vnet/srv6/sr_pt_api.c
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright(c) 2022 Cisco Systems, Inc.
+ */
+
+#include <vnet/vnet.h>
+#include <vlibmemory/api.h>
+#include <vnet/srv6/sr_pt.h>
+
+#include <vnet/interface.h>
+#include <vnet/api_errno.h>
+
+#include <vnet/srv6/sr_pt.api_enum.h>
+#include <vnet/srv6/sr_pt.api_types.h>
+
+#define REPLY_MSG_ID_BASE sr_pt_main.msg_id_base
+#include <vlibapi/api_helper_macros.h>
+
+static void
+send_sr_pt_iface_details (sr_pt_iface_t *t, vl_api_registration_t *reg,
+			  u32 context)
+{
+  vl_api_sr_pt_iface_details_t *rmp;
+
+  rmp = vl_msg_api_alloc (sizeof (*rmp));
+  clib_memset (rmp, 0, sizeof (*rmp));
+  rmp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_SR_PT_IFACE_DETAILS);
+
+  rmp->sw_if_index = ntohl (t->iface);
+  rmp->id = ntohs (t->id);
+  rmp->ingress_load = t->ingress_load;
+  rmp->egress_load = t->egress_load;
+  rmp->tts_template = t->tts_template;
+
+  rmp->context = context;
+
+  vl_api_send_msg (reg, (u8 *) rmp);
+}
+
+static void
+vl_api_sr_pt_iface_dump_t_handler (vl_api_sr_pt_iface_dump_t *mp)
+{
+  vl_api_registration_t *reg;
+  sr_pt_main_t *pt = &sr_pt_main;
+  sr_pt_iface_t *t;
+
+  reg = vl_api_client_index_to_registration (mp->client_index);
+  if (!reg)
+    return;
+
+  pool_foreach (t, pt->sr_pt_iface)
+    {
+      send_sr_pt_iface_details (t, reg, mp->context);
+    }
+}
+
+static void
+vl_api_sr_pt_iface_add_t_handler (vl_api_sr_pt_iface_add_t *mp)
+{
+  vl_api_sr_pt_iface_add_reply_t *rmp;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv = sr_pt_add_iface (ntohl (mp->sw_if_index), ntohs (mp->id),
+			mp->ingress_load, mp->egress_load, mp->tts_template);
+
+  BAD_SW_IF_INDEX_LABEL;
+  REPLY_MACRO (VL_API_SR_PT_IFACE_ADD_REPLY);
+}
+
+static void
+vl_api_sr_pt_iface_del_t_handler (vl_api_sr_pt_iface_del_t *mp)
+{
+  vl_api_sr_pt_iface_del_reply_t *rmp;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  rv = sr_pt_del_iface (ntohl (mp->sw_if_index));
+
+  BAD_SW_IF_INDEX_LABEL;
+  REPLY_MACRO (VL_API_SR_PT_IFACE_DEL_REPLY);
+}
+
+#include <vnet/srv6/sr_pt.api.c>
+static clib_error_t *
+sr_pt_api_hookup (vlib_main_t *vm)
+{
+  /*
+   * Set up the (msg_name, crc, message-id) table
+   */
+  REPLY_MSG_ID_BASE = setup_message_id_table ();
+
+  return 0;
+}
+
+VLIB_API_INIT_FUNCTION (sr_pt_api_hookup);
\ No newline at end of file