[dpdk-dev] [PATCH 3/3] build: support disabling drivers with meson

[Bruce Richardson]

Add support for a new build option to turn off certain drivers. Any other
drivers which depend on the one being disabled will also be disabled with a
suitable debug message.

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
 drivers/meson.build | 16 ++++++++++++----
 meson_options.txt   |  2 ++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/meson.build b/drivers/meson.build
index ee5db4157..e7a696d52 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -16,6 +16,8 @@ dpdk_driver_classes = ['common',
 	       'baseband', # depends on common and bus.
 	       'raw']     # depends on common, bus, mempool, net and event.
 
+disabled_drivers = get_option('disable_drivers').split(',')
+
 default_cflags = machine_args
 if cc.has_argument('-Wno-format-truncation')
 	default_cflags += '-Wno-format-truncation'
@@ -59,17 +61,23 @@ foreach class:dpdk_driver_classes
 		# pull in driver directory which should assign to each of the above
 		subdir(drv_path)
 
-		if build
+		if drv_path in disabled_drivers
+			build = false
+			reason = 'Explicitly disabled via build config'
+		elif build
 			# get dependency objs from strings
 			shared_deps = ext_deps
 			static_deps = ext_deps
 			foreach d:deps
 				if not is_variable('shared_rte_' + d)
-					error('Missing internal dependency "@0@" for @1@ [@2@]'
+					build = false
+					reason = 'Missing internal dependency, "@0@"'.format(d)
+					message('Disabling @1@ [@2@]: missing internal dependency "@0@"'
 							.format(d, name, 'drivers/' + drv_path))
+				else
+					shared_deps += [get_variable('shared_rte_' + d)]
+					static_deps += [get_variable('static_rte_' + d)]
 				endif
-				shared_deps += [get_variable('shared_rte_' + d)]
-				static_deps += [get_variable('static_rte_' + d)]
 			endforeach
 		endif
 
diff --git a/meson_options.txt b/meson_options.txt
index 448f3e63d..89650b0e9 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -2,6 +2,8 @@
 
 option('allow_invalid_socket_id', type: 'boolean', value: false,
 	description: 'allow out-of-range NUMA socket id\'s for platforms that don\'t report the value correctly')
+option('disable_drivers', type: 'string', value: '',
+	description: 'Comma-separated list of drivers to explicitly disable.')
 option('drivers_install_subdir', type: 'string', value: 'dpdk/pmds-<VERSION>',
 	description: 'Subdirectory of libdir where to install PMDs. Defaults to using a versioned subdirectory.')
 option('enable_docs', type: 'boolean', value: false,
-- 
2.21.0