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init / exit function ordering

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The vlib init function subsystem now supports a mix of procedural and
formally-specified ordering constraints. We should eliminate procedural
knowledge wherever possible.

The following schemes are *roughly* equivalent:

static clib_error_t *init_runs_first (vlib_main_t *vm)
{
   clib_error_t *error;

   ... do some stuff...

   if ((error = vlib_call_init_function (init_runs_next)))
     return error;
   ...
}
VLIB_INIT_FUNCTION (init_runs_first);

and

static clib_error_t *init_runs_first (vlib_main_t *vm)
{
   ... do some stuff...
}
VLIB_INIT_FUNCTION (init_runs_first) =
{
    .runs_before = VLIB_INITS("init_runs_next"),
};

The first form will [most likely] call "init_runs_next" on the
spot. The second form means that "init_runs_first" runs before
"init_runs_next," possibly much earlier in the sequence.

Please DO NOT construct sets of init functions where A before B
actually means A *right before* B. It's not necessary - simply combine
A and B - and it leads to hugely annoying debugging exercises when
trying to switch from ad-hoc procedural ordering constraints to formal
ordering constraints.

Change-Id: I5e4353503bf43b4acb11a45fb33c79a5ade8426c
Signed-off-by: Dave Barach <dave@barachs.net>
This commit is contained in:
Dave Barach
2019-05-14 18:01:44 -04:00
committed by Florin Coras
parent c1f93067ed
commit f8d50682cd
62 changed files with 959 additions and 476 deletions
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11
src/plugins/tlsmbedtls/tls_mbedtls.c
View File

@ -635,14 +635,10 @@ tls_mbedtls_init (vlib_main_t * vm)
{
vlib_thread_main_t *vtm = vlib_get_thread_main ();
mbedtls_main_t *mm = &mbedtls_main;
clib_error_t *error;
u32 num_threads;
num_threads = 1 /* main thread */ + vtm->n_threads;
if ((error = vlib_call_init_function (vm, tls_init)))
return error;
if (tls_init_ca_chain ())
{
clib_warning ("failed to initialize TLS CA chain");
@ -667,7 +663,12 @@ tls_mbedtls_init (vlib_main_t * vm)
return 0;
}
VLIB_INIT_FUNCTION (tls_mbedtls_init);
/* *INDENT-OFF* */
VLIB_INIT_FUNCTION (tls_mbedtls_init) =
{
.runs_after = VLIB_INITS("tls_init"),
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () = {