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authorDave Barach <dave@barachs.net>2019-05-14 18:01:44 -0400
committerFlorin Coras <florin.coras@gmail.com>2019-05-16 16:11:23 +0000
commitf8d50682cd1245f6f5ce4c846ca6f1bdc11255a6 (patch)
tree8ecc60e4715db88bdbc8ea6bd0170fbae6f645eb /src/vnet/dpo
parentc1f93067ed4b9954bbba82e2c9c104b22e2f7f33 (diff)
init / exit function ordering
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>
Diffstat (limited to 'src/vnet/dpo')
-rw-r--r--src/vnet/dpo/dpo.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/src/vnet/dpo/dpo.c b/src/vnet/dpo/dpo.c
index df78456bf60..13ae37a74a8 100644
--- a/src/vnet/dpo/dpo.c
+++ b/src/vnet/dpo/dpo.c
@@ -16,7 +16,7 @@
* @brief
* A Data-Path Object is an object that represents actions that are
* applied to packets are they are switched through VPP.
- *
+ *
* The DPO is a base class that is specialised by other objects to provide
* concrete actions
*
@@ -267,10 +267,10 @@ dpo_copy (dpo_id_t *dst,
* the destination is written in a single u64 write - hence atomically w.r.t
* any packets inflight.
*/
- *((u64*)dst) = *(u64*)src;
+ *((u64*)dst) = *(u64*)src;
dpo_lock(dst);
- dpo_unlock(&tmp);
+ dpo_unlock(&tmp);
}
int
@@ -592,7 +592,12 @@ dpo_module_init (vlib_main_t * vm)
return (NULL);
}
-VLIB_INIT_FUNCTION(dpo_module_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION(dpo_module_init) =
+{
+ .runs_before = VLIB_INITS ("ip_main_init"),
+};
+/* *INDENT-ON* */
static clib_error_t *
dpo_memory_show (vlib_main_t * vm,