From f8d50682cd1245f6f5ce4c846ca6f1bdc11255a6 Mon Sep 17 00:00:00 2001 From: Dave Barach Date: Tue, 14 May 2019 18:01:44 -0400 Subject: 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 --- src/plugins/ioam/udp-ping/udp_ping_export.c | 13 +++++++------ src/plugins/ioam/udp-ping/udp_ping_node.c | 12 ++++++------ 2 files changed, 13 insertions(+), 12 deletions(-) (limited to 'src/plugins/ioam/udp-ping') diff --git a/src/plugins/ioam/udp-ping/udp_ping_export.c b/src/plugins/ioam/udp-ping/udp_ping_export.c index 7a7cad4934a..d25eb1041dd 100644 --- a/src/plugins/ioam/udp-ping/udp_ping_export.c +++ b/src/plugins/ioam/udp-ping/udp_ping_export.c @@ -290,15 +290,16 @@ VLIB_CLI_COMMAND (set_udp_ping_export_command, static) = { clib_error_t * udp_ping_flow_report_init (vlib_main_t * vm) { - clib_error_t *error; - - if ((error = vlib_call_init_function (vm, flow_report_init))) - return error; - return 0; } -VLIB_INIT_FUNCTION (udp_ping_flow_report_init); +/* *INDENT-OFF* */ +VLIB_INIT_FUNCTION (udp_ping_flow_report_init) = +{ + .runs_after = VLIB_INITS ("flow_report_init"), +}; +/* *INDENT-ON* */ + /* * fd.io coding-style-patch-verification: ON diff --git a/src/plugins/ioam/udp-ping/udp_ping_node.c b/src/plugins/ioam/udp-ping/udp_ping_node.c index 59e4511eb7d..e5916dbd0e1 100644 --- a/src/plugins/ioam/udp-ping/udp_ping_node.c +++ b/src/plugins/ioam/udp-ping/udp_ping_node.c @@ -819,21 +819,21 @@ VLIB_REGISTER_NODE (udp_ping_local, static) = static clib_error_t * udp_ping_init (vlib_main_t * vm) { - clib_error_t *error = 0; - udp_ping_main.vlib_main = vm; udp_ping_main.vnet_main = vnet_get_main (); udp_ping_main.timer_interval = 1e9; - if ((error = vlib_call_init_function (vm, ip_main_init))) - return (error); - ip6_register_protocol (IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS, udp_ping_local.index); return 0; } -VLIB_INIT_FUNCTION (udp_ping_init); +/* *INDENT-OFF* */ +VLIB_INIT_FUNCTION (udp_ping_init) = +{ + .runs_after = VLIB_INITS("ip_main_init"), +}; +/* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON -- cgit 1.2.3-korg