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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/mpls/mpls_input.c
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/mpls/mpls_input.c')
-rw-r--r--src/vnet/mpls/mpls_input.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/src/vnet/mpls/mpls_input.c b/src/vnet/mpls/mpls_input.c
index 1dd5e326a3c..37fa1aead12 100644
--- a/src/vnet/mpls/mpls_input.c
+++ b/src/vnet/mpls/mpls_input.c
@@ -50,8 +50,8 @@ format_mpls_input_trace (u8 * s, va_list * args)
#define _(a,b) if (t->next_index == MPLS_INPUT_NEXT_##a) next_name = b;
foreach_mpls_input_next;
#undef _
-
- s = format (s, "MPLS: next %s[%d] label %d ttl %d exp %d",
+
+ s = format (s, "MPLS: next %s[%d] label %d ttl %d exp %d",
next_name, t->next_index,
vnet_mpls_uc_get_label(label),
vnet_mpls_uc_get_ttl(label),
@@ -209,9 +209,9 @@ mpls_input_inline (vlib_main_t * vm,
vlib_increment_simple_counter (cm, thread_index, sw_if_index0, 1);
}
- if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
- mpls_input_trace_t *tr = vlib_add_trace (vm, node,
+ mpls_input_trace_t *tr = vlib_add_trace (vm, node,
b0, sizeof (*tr));
tr->next_index = next0;
tr->label_net_byte_order = *(u32*)h0;
@@ -278,16 +278,15 @@ mpls_setup_nodes (vlib_main_t * vm)
static clib_error_t * mpls_input_init (vlib_main_t * vm)
{
- clib_error_t * error;
-
- error = vlib_call_init_function (vm, mpls_init);
- if (error)
- clib_error_report (error);
-
mpls_setup_nodes (vm);
return 0;
}
-VLIB_INIT_FUNCTION (mpls_input_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (mpls_input_init) =
+{
+ .runs_after = VLIB_INITS("mpls_init"),
+};
+/* *INDENT-ON* */
#endif /* CLIB_MARCH_VARIANT */