Add client-side msg_name_and_crc -> msg_index table

vppapigen now generates per-message crcs. Verified that whitespace
and real changes in message A don't change the crc for message B, etc.

Fixed the sample and flowperpkt plugins to participate. Others need
the same treatment. They don't build due to python/java language binding
build issues.

To use the scheme:

Client connects as usual.

Then call: u32 vl_api_get_msg_index(char * name_and_crc)
name_and_crc is a string like: "flowperpkt_tx_interface_add_del_753301f3",
aka the message name with _%08x <expected crc> appended.

Try these vpp-api-test commands to play with it:

vat# dump_msg_api_table
     <snip>
 [366]: punt_reply_cca27fbe
 [367]: ipsec_spd_dump_5e9ae88e
 [368]: ipsec_spd_details_6f7821b0
 [369]: sample_macswap_enable_disable_0f2813e2
 [370]: sample_macswap_enable_disable_reply_476738e5
 [371]: flowperpkt_tx_interface_add_del_753301f3
 [372]: flowperpkt_tx_interface_add_del_reply_d47e6e0b

vat# get_msg_id sample_macswap_enable_disable_reply_476738e5
 'sample_macswap_enable_disable_reply_476738e5' has message index 370

vat# get_msg_id sample_macswap_enable_disable_reply_476738e3
 'sample_macswap_enable_disable_reply_476738e3' not found

CRCs may vary, etc.

vppapigen is used to build a set of JSON representations
of each API file from vpp-api/Makefile.am and that is in
turn used by each language binding (Java, Python, Lua).

Change-Id: I3d64582e779dac5f20cddec79c562c288d8fd9c6
Signed-off-by: Dave Barach <dave@barachs.net>
Signed-off-by: Ole Troan <ot@cisco.com>

2 files changed, 21 insertions, 3 deletions

diff --git a/plugins/snat-plugin/Makefile.am b/plugins/snat-plugin/Makefile.am
index 9f41193a708..0a0fff86486 100644
--- a/plugins/snat-plugin/Makefile.am
+++ b/plugins/snat-plugin/Makefile.am
@@ -39,8 +39,8 @@ SUFFIXES = .api.h .api
 
 %.py: %.api
 	$(info Creating Python binding for $@)
-	$(CC) $(CPPFLAGS) -E -P -C -x c $<				\
-	| vppapigen --input - --python -				\
+	$(CC) $(CPPFLAGS) -E -P -C -x c $<                              \
+	| vppapigen --input - --python -                                \
 	| pyvppapigen.py --input - > $@
 
 pyapidir = ${prefix}/vpp_papi_plugins
@@ -59,7 +59,8 @@ install-data-hook:
 	@(cd $(vpppluginsdir) && $(RM) $(vppplugins_LTLIBRARIES))
 	@(cd $(vppapitestpluginsdir) && $(RM) $(vppapitestplugins_LTLIBRARIES))
 
-
+apidir = $(prefix)/snat
+api_DATA = snat/snat.api
 
 #
 # Java code generation
diff --git a/plugins/snat-plugin/snat/snat.c b/plugins/snat-plugin/snat/snat.c
index 66c03817ca0..2956e24f054 100644
--- a/plugins/snat-plugin/snat/snat.c
+++ b/plugins/snat-plugin/snat/snat.c
@@ -955,6 +955,19 @@ snat_plugin_api_hookup (vlib_main_t *vm)
     return 0;
 }
 
+#define vl_msg_name_crc_list
+#include <snat/snat_all_api_h.h>
+#undef vl_msg_name_crc_list
+
+static void
+setup_message_id_table (snat_main_t * sm, api_main_t * am)
+{
+#define _(id,n,crc) \
+  vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id + sm->msg_id_base);
+  foreach_vl_msg_name_crc_snat;
+#undef _
+}
+
 static void plugin_custom_dump_configure (snat_main_t * sm) 
 {
 #define _(n,f) sm->api_main->msg_print_handlers \
@@ -985,6 +998,10 @@ static clib_error_t * snat_init (vlib_main_t * vm)
   sm->api_main = &api_main;
 
   error = snat_plugin_api_hookup (vm);
+
+  /* Add our API messages to the global name_crc hash table */
+  setup_message_id_table (sm, &api_main);
+
   plugin_custom_dump_configure (sm);
   vec_free(name);