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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/vlib/linux
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/vlib/linux')
-rw-r--r--src/vlib/linux/pci.c13
-rw-r--r--src/vlib/linux/vmbus.c9
2 files changed, 14 insertions, 8 deletions
diff --git a/src/vlib/linux/pci.c b/src/vlib/linux/pci.c
index 8b614c751a1..20d44cd6d6e 100644
--- a/src/vlib/linux/pci.c
+++ b/src/vlib/linux/pci.c
@@ -1449,13 +1449,9 @@ linux_pci_init (vlib_main_t * vm)
{
vlib_pci_main_t *pm = &pci_main;
vlib_pci_addr_t *addr = 0, *addrs;
- clib_error_t *error;
pm->vlib_main = vm;
- if ((error = vlib_call_init_function (vm, unix_input_init)))
- return error;
-
ASSERT (sizeof (vlib_pci_addr_t) == sizeof (u32));
addrs = vlib_pci_get_all_dev_addrs ();
@@ -1471,10 +1467,15 @@ linux_pci_init (vlib_main_t * vm)
}
/* *INDENT-ON* */
- return error;
+ return 0;
}
-VLIB_INIT_FUNCTION (linux_pci_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (linux_pci_init) =
+{
+ .runs_after = VLIB_INITS("unix_input_init"),
+};
+/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
diff --git a/src/vlib/linux/vmbus.c b/src/vlib/linux/vmbus.c
index d0efbd748ef..2fc438b4778 100644
--- a/src/vlib/linux/vmbus.c
+++ b/src/vlib/linux/vmbus.c
@@ -407,10 +407,15 @@ linux_vmbus_init (vlib_main_t * vm)
pm->vlib_main = vm;
- return vlib_call_init_function (vm, unix_input_init);
+ return 0;
}
-VLIB_INIT_FUNCTION (linux_vmbus_init);
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (linux_vmbus_init) =
+{
+ .runs_before = VLIB_INITS("unix_input_init"),
+};
+/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON