[dpdk-stable] [PATCH dpdk-dev v3] common/mlx5: fix dynamic loading reference

[xiangxia.m.yue at gmail.com]

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

When setting the CONFIG_RTE_BUILD_SHARED_LIB to y,
and build the mlx5 pmd, there is a building error.
To fix it, add RTE_IBVERBS_LINK_DLOPEN to include
relative codes.

    mlx5_common.o: In function `mlx5_glue_init':
    drivers/common/mlx5/mlx5_common.c:324: undefined reference to `dlclose'

Fixes: 7b4f1e6bd367 ("common/mlx5: introduce common library")
Cc: stable at dpdk.org

Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Tested-by: Ali Alnubani <alialnu at mellanox.com>
---
v3:
* rename the patch title
* mv the dlfcn.h to define area
* tested: https://travis-ci.com/ovn-open-virtual-networks/dpdk-next-net/builds/151882661

v2:
* change the patch title
---
 drivers/common/mlx5/mlx5_common.c | 10 +++++++---
 drivers/net/mlx4/mlx4.c           |  4 +++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/common/mlx5/mlx5_common.c b/drivers/common/mlx5/mlx5_common.c
index 610fb48..9ea56f2 100644
--- a/drivers/common/mlx5/mlx5_common.c
+++ b/drivers/common/mlx5/mlx5_common.c
@@ -2,10 +2,12 @@
  * Copyright 2019 Mellanox Technologies, Ltd
  */
 
-#include <dlfcn.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdio.h>
+#ifdef RTE_IBVERBS_LINK_DLOPEN
+#include <dlfcn.h>
+#endif
 
 #include <rte_errno.h>
 
@@ -209,8 +211,6 @@ enum mlx5_class
  */
 RTE_INIT_PRIO(mlx5_glue_init, CLASS)
 {
-	void *handle = NULL;
-
 	/* Initialize common log type. */
 	mlx5_common_logtype = rte_log_register("pmd.common.mlx5");
 	if (mlx5_common_logtype >= 0)
@@ -233,6 +233,8 @@ enum mlx5_class
 	/* The glue initialization was done earlier by mlx5 common library. */
 #ifdef RTE_IBVERBS_LINK_DLOPEN
 	char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
+	void *handle = NULL;
+
 	const char *path[] = {
 		/*
 		 * A basic security check is necessary before trusting
@@ -320,8 +322,10 @@ enum mlx5_class
 	mlx5_glue->fork_init();
 	return;
 glue_error:
+#ifdef RTE_IBVERBS_LINK_DLOPEN
 	if (handle)
 		dlclose(handle);
+#endif
 	DRV_LOG(WARNING, "Cannot initialize MLX5 common due to missing"
 		" run-time dependency on rdma-core libraries (libibverbs,"
 		" libmlx5)");
diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index a1dd658..8e29878 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -8,7 +8,6 @@
  * mlx4 driver initialization.
  */
 
-#include <dlfcn.h>
 #include <errno.h>
 #include <inttypes.h>
 #include <stddef.h>
@@ -18,6 +17,9 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
+#ifdef RTE_IBVERBS_LINK_DLOPEN
+#include <dlfcn.h>
+#endif
 
 /* Verbs headers do not support -pedantic. */
 #ifdef PEDANTIC
-- 
1.8.3.1