[PATCH v3 17/19] common/mlx5: remove use of VLAs for Windows built code

[Tyler Retzlaff <roretzla@linux.microsoft.com>]

MSVC does not support VLAs, replace VLAs with standard C arrays
or alloca(). alloca() is available for all toolchain/platform
combinations officially supported by DPDK.

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 drivers/common/mlx5/mlx5_common.h    | 4 ++--
 drivers/common/mlx5/mlx5_devx_cmds.c | 7 +++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_common.h b/drivers/common/mlx5/mlx5_common.h
index 9c80277..76eba1c 100644
--- a/drivers/common/mlx5/mlx5_common.h
+++ b/drivers/common/mlx5/mlx5_common.h
@@ -112,10 +112,10 @@
 /* Allocate a buffer on the stack and fill it with a printf format string. */
 #define MKSTR(name, ...) \
 	int mkstr_size_##name = snprintf(NULL, 0, "" __VA_ARGS__); \
-	char name[mkstr_size_##name + 1]; \
+	char *name = alloca(mkstr_size_##name + 1); \
 	\
 	memset(name, 0, mkstr_size_##name + 1); \
-	snprintf(name, sizeof(name), "" __VA_ARGS__)
+	snprintf(name, mkstr_size_##name + 1, "" __VA_ARGS__)
 
 enum {
 	PCI_VENDOR_ID_MELLANOX = 0x15b3,
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c
index 9b7abab..bac272f 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.c
+++ b/drivers/common/mlx5/mlx5_devx_cmds.c
@@ -284,10 +284,9 @@ struct mlx5_devx_obj *
 				 void *cmd_comp,
 				 uint64_t async_id)
 {
-	int out_len = MLX5_ST_SZ_BYTES(query_flow_counter_out) +
-			MLX5_ST_SZ_BYTES(traffic_counter);
-	uint32_t out[out_len];
+	uint32_t out[MLX5_ST_SZ_BYTES(query_flow_counter_out) + MLX5_ST_SZ_BYTES(traffic_counter)];
 	uint32_t in[MLX5_ST_SZ_DW(query_flow_counter_in)] = {0};
+	const int out_len = RTE_DIM(out);
 	void *stats;
 	int rc;
 
@@ -346,7 +345,7 @@ struct mlx5_devx_obj *
 	int klm_num = attr->klm_num;
 	int in_size_dw = MLX5_ST_SZ_DW(create_mkey_in) +
 		     (klm_num ? RTE_ALIGN(klm_num, 4) : 0) * MLX5_ST_SZ_DW(klm);
-	uint32_t in[in_size_dw];
+	uint32_t *in = alloca(sizeof(uint32_t) * in_size_dw);
 	uint32_t out[MLX5_ST_SZ_DW(create_mkey_out)] = {0};
 	void *mkc;
 	struct mlx5_devx_obj *mkey = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*mkey),
-- 
1.8.3.1