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>

1 files changed, 46 insertions, 14 deletions

diff --git a/vlib-api/vlibmemory/memory_shared.c b/vlib-api/vlibmemory/memory_shared.c
index 134fcd52c84..6adc69fc05f 100644
--- a/vlib-api/vlibmemory/memory_shared.c
+++ b/vlib-api/vlibmemory/memory_shared.c
@@ -541,28 +541,62 @@ vl_msg_api_send_shmem_nolock (unix_shared_memory_queue_t * q, u8 * elem)
 static void
 vl_api_memclnt_create_reply_t_handler (vl_api_memclnt_create_reply_t * mp)
 {
+  serialize_main_t _sm, *sm = &_sm;
   api_main_t *am = &api_main;
-  int rv;
+  u8 *tblv;
+  u32 nmsgs;
+  int i;
+  u8 *name_and_crc;
+  u32 msg_index;
 
   am->my_client_index = mp->index;
   am->my_registration = (vl_api_registration_t *) (uword) mp->handle;
 
-  rv = ntohl (mp->response);
+  /* Clean out any previous hash table (unlikely) */
+  if (am->msg_index_by_name_and_crc)
+    {
+      int i;
+      u8 **keys = 0;
+      hash_pair_t *hp;
+      /* *INDENT-OFF* */
+      hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
+      ({
+        vec_add1 (keys, (u8 *) hp->key);
+      }));
+      /* *INDENT-ON* */
+      for (i = 0; i < vec_len (keys); i++)
+	vec_free (keys[i]);
+      vec_free (keys);
+    }
 
-  if (rv < 0)
-    clib_warning ("WARNING: API mismatch detected");
-}
+  am->msg_index_by_name_and_crc = hash_create_string (0, sizeof (uword));
 
-void vl_client_add_api_signatures (vl_api_memclnt_create_t * mp)
-  __attribute__ ((weak));
+  /* Recreate the vnet-side API message handler table */
+  tblv = (u8 *) mp->message_table;
+  serialize_open_vector (sm, tblv);
+  unserialize_integer (sm, &nmsgs, sizeof (u32));
 
-void
-vl_client_add_api_signatures (vl_api_memclnt_create_t * mp)
+  for (i = 0; i < nmsgs; i++)
+    {
+      msg_index = unserialize_likely_small_unsigned_integer (sm);
+      unserialize_cstring (sm, (char **) &name_and_crc);
+      hash_set_mem (am->msg_index_by_name_and_crc, name_and_crc, msg_index);
+    }
+}
+
+u32
+vl_api_get_msg_index (u8 * name_and_crc)
 {
-  int i;
+  api_main_t *am = &api_main;
+  uword *p;
 
-  for (i = 0; i < ARRAY_LEN (mp->api_versions); i++)
-    mp->api_versions[i] = 0;
+  if (am->msg_index_by_name_and_crc)
+    {
+      p = hash_get_mem (am->msg_index_by_name_and_crc, name_and_crc);
+      if (p)
+	return p[0];
+    }
+  return ~0;
 }
 
 int
@@ -617,8 +651,6 @@ vl_client_connect (char *name, int ctx_quota, int input_queue_size)
   mp->input_queue = (uword) vl_input_queue;
   strncpy ((char *) mp->name, name, sizeof (mp->name) - 1);
 
-  vl_client_add_api_signatures (mp);
-
   vl_msg_api_send_shmem (shmem_hdr->vl_input_queue, (u8 *) & mp);
 
   while (1)