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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/unix
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/unix')
-rw-r--r--src/vnet/unix/tuntap.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/src/vnet/unix/tuntap.c b/src/vnet/unix/tuntap.c
index 103b6496a34..9d6f8992414 100644
--- a/src/vnet/unix/tuntap.c
+++ b/src/vnet/unix/tuntap.c
@@ -1011,7 +1011,6 @@ VNET_DEVICE_CLASS (tuntap_dev_class,static) = {
static clib_error_t *
tuntap_init (vlib_main_t * vm)
{
- clib_error_t *error;
ip4_main_t *im4 = &ip4_main;
ip6_main_t *im6 = &ip6_main;
ip4_add_del_interface_address_callback_t cb4;
@@ -1019,10 +1018,6 @@ tuntap_init (vlib_main_t * vm)
tuntap_main_t *tm = &tuntap_main;
vlib_thread_main_t *m = vlib_get_thread_main ();
- error = vlib_call_init_function (vm, ip4_init);
- if (error)
- return error;
-
mhash_init (&tm->subif_mhash, sizeof (u32), sizeof (subif_address_t));
cb4.function = tuntap_ip4_add_del_interface_address;
@@ -1038,7 +1033,12 @@ tuntap_init (vlib_main_t * vm)
return 0;
}
-VLIB_INIT_FUNCTION (tuntap_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (tuntap_init) =
+{
+ .runs_after = VLIB_INITS("ip4_init"),
+};
+/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON