[PATCH v3 1/2] common/mlx5: fix build disabling

[Thomas Monjalon <thomas@monjalon.net>]

If the dependency common/mlx5 is explicitly disabled,
but net/mlx5 is not explicitly disabled,
Meson will read the full recipe of net/mlx5
and will fail when accessing a variable from common/mlx5:
drivers/net/mlx5/meson.build:76:4: ERROR: Unknown variable "mlx5_config".

The solution is to stop parsing net/mlx5 if common/mlx5 is disabled.
The deps array must be defined before stopping, in order to automatically
disable the build of net/mlx5 and print the reason.

The same protection is applied to other mlx5 drivers,
so it will allow using the variable mlx5_config in future.

Fixes: 22681deead3e ("net/mlx5/hws: enable hardware steering")

Reported-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/compress/mlx5/meson.build | 5 +++++
 drivers/crypto/mlx5/meson.build   | 5 +++++
 drivers/net/mlx5/meson.build      | 5 +++++
 drivers/regex/mlx5/meson.build    | 5 +++++
 drivers/vdpa/mlx5/meson.build     | 5 +++++
 5 files changed, 25 insertions(+)

diff --git a/drivers/compress/mlx5/meson.build b/drivers/compress/mlx5/meson.build
index 7aac329986..49ce3aff46 100644
--- a/drivers/compress/mlx5/meson.build
+++ b/drivers/compress/mlx5/meson.build
@@ -9,6 +9,11 @@ endif
 
 fmt_name = 'mlx5_compress'
 deps += ['common_mlx5', 'eal', 'compressdev']
+if not ('mlx5' in common_drivers)
+    # avoid referencing undefined variables from common/mlx5
+    subdir_done()
+endif
+
 sources = files(
         'mlx5_compress.c',
 )
diff --git a/drivers/crypto/mlx5/meson.build b/drivers/crypto/mlx5/meson.build
index 9d9c9c00bc..7521c4c671 100644
--- a/drivers/crypto/mlx5/meson.build
+++ b/drivers/crypto/mlx5/meson.build
@@ -9,6 +9,11 @@ endif
 
 fmt_name = 'mlx5_crypto'
 deps += ['common_mlx5', 'eal', 'cryptodev']
+if not ('mlx5' in common_drivers)
+    # avoid referencing undefined variables from common/mlx5
+    subdir_done()
+endif
+
 sources = files(
         'mlx5_crypto.c',
         'mlx5_crypto_dek.c',
diff --git a/drivers/net/mlx5/meson.build b/drivers/net/mlx5/meson.build
index ff84448186..fa15158039 100644
--- a/drivers/net/mlx5/meson.build
+++ b/drivers/net/mlx5/meson.build
@@ -9,6 +9,11 @@ if not (is_linux or is_windows)
 endif
 
 deps += ['hash', 'common_mlx5']
+if not ('mlx5' in common_drivers)
+    # avoid referencing undefined variables from common/mlx5
+    subdir_done()
+endif
+
 headers = files('rte_pmd_mlx5.h')
 sources = files(
         'mlx5.c',
diff --git a/drivers/regex/mlx5/meson.build b/drivers/regex/mlx5/meson.build
index e553dcb83d..70edc5b6da 100644
--- a/drivers/regex/mlx5/meson.build
+++ b/drivers/regex/mlx5/meson.build
@@ -8,6 +8,11 @@ if not is_linux
 endif
 
 deps += ['common_mlx5', 'eal', 'regexdev']
+if not ('mlx5' in common_drivers)
+    # avoid referencing undefined variables from common/mlx5
+    subdir_done()
+endif
+
 sources = files(
         'mlx5_regex.c',
         'mlx5_rxp.c',
diff --git a/drivers/vdpa/mlx5/meson.build b/drivers/vdpa/mlx5/meson.build
index 9d8dbb1a82..54a4eac6f4 100644
--- a/drivers/vdpa/mlx5/meson.build
+++ b/drivers/vdpa/mlx5/meson.build
@@ -8,6 +8,11 @@ if not is_linux
 endif
 
 deps += ['hash', 'common_mlx5', 'vhost', 'pci', 'eal', 'sched']
+if not ('mlx5' in common_drivers)
+    # avoid referencing undefined variables from common/mlx5
+    subdir_done()
+endif
+
 sources = files(
         'mlx5_vdpa.c',
         'mlx5_vdpa_mem.c',
-- 
2.36.1