[dpdk-dev] [PATCH v2 2/2] net/mlx4: load libmlx4 and libibverbs in run-time

[Shachar Beiser <shacharbe@mellanox.com>]

MLX4 PMD dynamically loads mlx4 and ibverbs in
run-time and it is not linked to external libraries.

Signed-off-by: Shachar Beiser <shacharbe@mellanox.com>
---
    History:
        V1: http://dpdk.org/dev/patchwork/patch/31555/
    V2:
        Fixing checkpatch code styling warnings
---
 config/common_base              |   1 +
 drivers/net/mlx4/Makefile       |  14 +-
 drivers/net/mlx4/lib/mlx4_dll.c | 731 ++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx4/lib/mlx4_dll.h |  94 ++++++
 drivers/net/mlx4/mlx4.c         |  12 +
 drivers/net/mlx4/mlx4.h         |   4 +
 drivers/net/mlx4/mlx4_ethdev.c  |   4 +
 drivers/net/mlx4/mlx4_flow.c    |   4 +
 drivers/net/mlx4/mlx4_mr.c      |   4 +
 drivers/net/mlx4/mlx4_prm.h     |   4 +
 drivers/net/mlx4/mlx4_rxq.c     |   4 +
 drivers/net/mlx4/mlx4_rxtx.c    |   4 +
 drivers/net/mlx4/mlx4_rxtx.h    |   4 +
 drivers/net/mlx4/mlx4_txq.c     |   4 +
 drivers/net/mlx5/lib/mlx5_dll.c |   4 +-
 mk/rte.app.mk                   |   7 +
 16 files changed, 895 insertions(+), 4 deletions(-)
 create mode 100644 drivers/net/mlx4/lib/mlx4_dll.c
 create mode 100644 drivers/net/mlx4/lib/mlx4_dll.h

diff --git a/config/common_base b/config/common_base
index 3708de4..8ef6be4 100644
--- a/config/common_base
+++ b/config/common_base
@@ -229,6 +229,7 @@ CONFIG_RTE_LIBRTE_FM10K_INC_VECTOR=y
 # Compile burst-oriented Mellanox ConnectX-3 (MLX4) PMD
 #
 CONFIG_RTE_LIBRTE_MLX4_PMD=n
+CONFIG_RTE_LIBRTE_MLX4_DLL=y
 CONFIG_RTE_LIBRTE_MLX4_DEBUG=n
 CONFIG_RTE_LIBRTE_MLX4_DEBUG_BROKEN_VERBS=n
 CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE=8
diff --git a/drivers/net/mlx4/Makefile b/drivers/net/mlx4/Makefile
index f1f47c2..aba1d5f 100644
--- a/drivers/net/mlx4/Makefile
+++ b/drivers/net/mlx4/Makefile
@@ -44,7 +44,9 @@ SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4_rxq.c
 SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4_rxtx.c
 SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4_txq.c
 SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4_utils.c
-
+ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLL),y)
+SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += lib/mlx4_dll.c
+endif
 # Basic CFLAGS.
 CFLAGS += -O3
 CFLAGS += -std=c11 -Wall -Wextra
@@ -54,7 +56,11 @@ CFLAGS += -D_BSD_SOURCE
 CFLAGS += -D_DEFAULT_SOURCE
 CFLAGS += -D_XOPEN_SOURCE=600
 CFLAGS += $(WERROR_FLAGS)
+ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLL),y)
+LDLIBS += -ldl
+else
 LDLIBS += -libverbs -lmlx4
+endif
 LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
 LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs
 LDLIBS += -lrte_bus_pci
@@ -81,7 +87,11 @@ endif
 ifdef CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE
 CFLAGS += -DMLX4_PMD_TX_MP_CACHE=$(CONFIG_RTE_LIBRTE_MLX4_TX_MP_CACHE)
 endif
-
+ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLL),y)
+CFLAGS += -DMLX4_PMD_DLL
+else
+CFLAGS += -UMLX4_PMD_DLL
+endif
 ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DEBUG_BROKEN_VERBS),y)
 CFLAGS += -DMLX4_PMD_DEBUG_BROKEN_VERBS
 endif
diff --git a/drivers/net/mlx4/lib/mlx4_dll.c b/drivers/net/mlx4/lib/mlx4_dll.c
new file mode 100644
index 0000000..0d8e7a9
--- /dev/null
+++ b/drivers/net/mlx4/lib/mlx4_dll.c
@@ -0,0 +1,731 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2015 6WIND S.A.
+ *   Copyright 2015 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <rte_log.h>
+#include "../mlx4_utils.h"
+#include "mlx4_dll.h"
+
+#define VERBS_LIB_DIR "/usr/lib64/libibverbs"
+#define MLX5_LIB_DIR "/usr/lib64/libmlx4"
+#define DIR_LENGTH 25
+/**
+ * Load a libibverbs and libmlx4 symbols table.
+ *
+ * @return
+ *   0 on success.
+ */
+int mlx4_load_libs(void)
+{
+	void *dlhandle;
+	int ret;
+
+	dlhandle = mlx4_lib_load("ibverbs.so");
+	if (dlhandle == NULL) {
+		ERROR("cannot load ibverbs.so");
+		return -1;
+	}
+	ret = mlx4_lverbs_function_register(dlhandle);
+	if (ret == -1) {
+		ERROR("cannot register a function in libverbs.so ");
+		return ret;
+	}
+	dlhandle = mlx4_lib_load("mlx4.so");
+	if (dlhandle == NULL) {
+		ERROR("cannot load mlx4.so");
+		return -1;
+	}
+	ret = mlx4_lmlx4_function_register(dlhandle);
+	if (ret == -1) {
+		ERROR("cannot register a function in lmlx4.so  ");
+		return ret;
+	}
+	return 0;
+}
+/**
+ * Load a libibverbs or libmlx4 symbols table.
+ *
+ * @param name[in]
+ *   The library name.
+ * @return
+ *   dlhandle on success.
+ */
+void *mlx4_lib_load(const char *name)
+{
+	char *so_name;
+	void *dlhandle;
+	char lib[DIR_LENGTH];
+
+	if (strcmp(name, "ibverbs.so"))
+		strcpy(lib, VERBS_LIB_DIR);
+	else
+		strcpy(lib, MLX5_LIB_DIR);
+	/* If the name is an absolute path then open that path after appending
+	 * the trailer suffix
+	 */
+	if (name[0] == '/') {
+		if (asprintf(&so_name, "%s", name) < 0)
+			goto out_asprintf;
+		dlhandle = dlopen(so_name, RTLD_LAZY);
+		if (!dlhandle)
+			goto out_dlopen;
+		free(so_name);
+		return dlhandle;
+	}
+	/* If configured with a provider plugin path then try that next */
+	if (strlen(lib) > 1) {
+		if (asprintf(&so_name, "%s/lib%s", lib, name) < 0)
+			goto out_asprintf;
+		dlhandle = dlopen(so_name, RTLD_LAZY);
+		free(so_name);
+		if (dlhandle)
+			return dlhandle;
+	}
+	/* Otherwise use the system libary search path. This is the historical
+	 * behavior of libibverbs
+	 */
+	if (asprintf(&so_name, "lib%s", name) < 0)
+		goto out_asprintf;
+	dlhandle = dlopen(so_name, RTLD_LAZY);
+	if (!dlhandle)
+		goto out_dlopen;
+	free(so_name);
+	return dlhandle;
+out_asprintf:
+	ERROR("Warning: couldn't load driver '%s'.\n", name);
+	return NULL;
+out_dlopen:
+	ERROR("Warning: couldn't load driver '%s': %s\n", so_name, dlerror());
+	free(so_name);
+	return NULL;
+}
+
+/**
+ * Register libibverbs functions apis .
+ *
+ * @param handle[in]
+ *   The library handle.
+ * @return
+ *   0 on success.
+ */
+int mlx4_lverbs_function_register(void *handle)
+{
+	char *error;
+	int ret = 0;
+
+	*(void **)(&mlx4_libverbs.ibv_destroy_qp) = dlsym(handle,
+													  "ibv_destroy_qp");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_destroy_cq) = dlsym(handle,
+													  "ibv_destroy_cq");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_dealloc_pd) = dlsym(handle,
+													  "ibv_dealloc_pd");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_get_device_list) =
+									dlsym(handle, "ibv_get_device_list");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_open_device) = dlsym(handle,
+													   "ibv_open_device");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_query_device) = dlsym(handle,
+														"ibv_query_device");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_close_device) = dlsym(handle,
+														"ibv_close_device");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_free_device_list) =
+										dlsym(handle, "ibv_free_device_list");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_alloc_pd) = dlsym(handle, "ibv_alloc_pd");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_get_device_name) =
+									dlsym(handle, "ibv_get_device_name");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_fork_init) = dlsym(handle,
+													 "ibv_fork_init");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_destroy_comp_channel) =
+									dlsym(handle, "ibv_destroy_comp_channel");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_dereg_mr) = dlsym(handle, "ibv_dereg_mr");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_create_comp_channel) =
+									dlsym(handle, "ibv_create_comp_channel");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_get_cq_event) = dlsym(handle,
+														"ibv_get_cq_event");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_create_qp) = dlsym(handle,
+													 "ibv_create_qp");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_ack_async_event) =
+									dlsym(handle, "ibv_ack_async_event");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_get_async_event) =
+									dlsym(handle, "ibv_get_async_event");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_reg_mr) = dlsym(handle, "ibv_reg_mr");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_create_cq) = dlsym(handle,
+													 "ibv_create_cq");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_modify_qp) = dlsym(handle,
+													 "ibv_modify_qp");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_libverbs.ibv_query_port) = dlsym(handle,
+													  "ibv_query_port");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	return 0;
+exit:
+	return -ret;
+}
+
+/**
+ * Register libmlx4 functions apis .
+ *
+ * @param handle[in]
+ *   The library handle.
+ * @return
+ *   0 on success.
+ */
+int mlx4_lmlx4_function_register(void *handle)
+{
+	char *error;
+	int ret = 0;
+
+	*(void **)(&mlx4_lmlx4.mlx4dv_init_obj) = dlsym(handle,
+													"mlx4dv_init_obj");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_lmlx4.mlx4dv_query_device) = dlsym(handle,
+														"mlx4dv_query_device");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	*(void **)(&mlx4_lmlx4.mlx4dv_set_context_attr) =
+								 dlsym(handle, "mlx4dv_set_context_attr");
+	error = dlerror();
+	if ((error) != NULL) {
+		ERROR("%s\n", error);
+		ret = EINVAL;
+		goto exit;
+	}
+	return 0;
+exit:
+	return -ret;
+}
+/**
+ * Function pointer calls mlx4 API .
+ *
+ * @param mlx4dv_obj[in]
+ *   The mlx4 object.
+ * @param obj_type[in]
+ *   The object type.
+ * @return
+ *   a pointer on success.
+ */
+int mlx4dv_init_obj(struct mlx4dv_obj *obj, uint64_t obj_type)
+{
+	return mlx4_lmlx4.mlx4dv_init_obj(obj, obj_type);
+}
+/**
+ * Function pointer calls mlx4 API .
+ *
+ * @param ctx_in[in]
+ *   The ibverbs context.
+ * @param attrs_out[out]
+ *   The mlx4 context.
+ * @return
+ *  0 on success.
+ */
+int mlx4dv_query_device(struct ibv_context *ctx_in,
+						struct mlx4dv_context *attrs_out)
+{
+	return mlx4_lmlx4.mlx4dv_query_device(ctx_in, attrs_out);
+}
+/**
+ * Function pointer calls mlx4 API .
+ *
+ * @param context[in]
+ *   The ibverbs context.
+ * @param type[in]
+ *   The mlx4 context attribute type.
+ * @param attr[in]
+ *   The mlx4 context attribute.
+ * @return
+ *  0 on success.
+ */
+int mlx4dv_set_context_attr(struct ibv_context *context,
+							enum mlx4dv_set_ctx_attr_type type,
+							void *attr)
+{
+	return mlx4_lmlx4.mlx4dv_set_context_attr(context, type, attr);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param qp[in]
+ *   Queue pair pointer.
+ * @return
+ *  0 on success.
+ */
+int ibv_destroy_qp(struct ibv_qp *qp)
+{
+	return mlx4_libverbs.ibv_destroy_qp(qp);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param cq[in]
+ *   Completion queue pointer.
+ * @return
+ *  0 on success.
+ */
+int ibv_destroy_cq(struct ibv_cq *cq)
+{
+	return mlx4_libverbs.ibv_destroy_cq(cq);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param pd[in]
+ *   Protection domain.
+ * @return
+ *  0 on success.
+ */
+int ibv_dealloc_pd(struct ibv_pd *pd)
+{
+	return mlx4_libverbs.ibv_dealloc_pd(pd);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param num_devices[in]
+ *   The number of devices.
+ * @return
+ *  0 on success.
+ */
+struct ibv_device **ibv_get_device_list(int *num_devices)
+{
+	return mlx4_libverbs.ibv_get_device_list(num_devices);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   The ibverbs context.
+ * @param device_attr[in]
+ *   The device attribute.
+ * @return
+ *  0 on success.
+ */
+int ibv_query_device(struct ibv_context *context,
+					 struct ibv_device_attr *device_attr)
+{
+	return mlx4_libverbs.ibv_query_device(context, device_attr);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   The ibverbs context.
+ * @return
+ *  0 on success.
+ */
+int ibv_close_device(struct ibv_context *context)
+{
+	return mlx4_libverbs.ibv_close_device(context);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param list[in]
+ *   The list of devices.
+ */
+void ibv_free_device_list(struct ibv_device **list)
+{
+	return mlx4_libverbs.ibv_free_device_list(list);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param device[in]
+ *   A device pointer.
+ * @return
+ *  The context on success.
+ */
+struct ibv_context *ibv_open_device(struct ibv_device *device)
+{
+	return mlx4_libverbs.ibv_open_device(device);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   An ibverbs context.
+ * @return
+ *  protection domain pointer on success.
+ */
+struct ibv_pd *ibv_alloc_pd(struct ibv_context *context)
+{
+	return mlx4_libverbs.ibv_alloc_pd(context);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param device[in]
+ *   An ibverbs device pointer.
+ * @return
+ *  device name on success.
+ */
+const char *ibv_get_device_name(struct ibv_device *device)
+{
+	return mlx4_libverbs.ibv_get_device_name(device);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @return
+ *  0 on success.
+ */
+int ibv_fork_init(void)
+{
+	return mlx4_libverbs.ibv_fork_init();
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param channel[in]
+ *   A completion channel.
+ * @return
+ *  0 on success.
+ */
+int ibv_destroy_comp_channel(struct ibv_comp_channel *channel)
+{
+	return mlx4_libverbs.ibv_destroy_comp_channel(channel);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param mr[in]
+ *   A pointer to memory region.
+ * @return
+ *  0 on success.
+ */
+int ibv_dereg_mr(struct ibv_mr *mr)
+{
+	return mlx4_libverbs.ibv_dereg_mr(mr);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   A pointer to ibverbs context.
+ * @return
+ *  0 on success.
+ */
+struct ibv_comp_channel *ibv_create_comp_channel(
+											  struct ibv_context *context)
+{
+	return mlx4_libverbs.ibv_create_comp_channel(context);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param channel[in]
+ *   A pointer to completion channel.
+ * @param cq[in]
+ *   A pointer to completion queue.
+ * @param cq_context[in]
+ *   A pointer to completion queue context.
+ * @return
+ *  0 on success.
+ */
+int ibv_get_cq_event(struct ibv_comp_channel *channel,
+					 struct ibv_cq **cq, void **cq_context)
+{
+	return mlx4_libverbs.ibv_get_cq_event(channel, cq, cq_context);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param cq[in]
+ *   A pointer to completion queue.
+ * @param nevents[in]
+ *   The number of events.
+ * @return
+ *  0 on success.
+ */
+void ibv_ack_cq_events(struct ibv_cq *cq, unsigned int nevents)
+{
+	return mlx4_libverbs.ibv_ack_cq_events(cq, nevents);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param pd[in]
+ *   The protection domain pointer.
+ * @param qp_init_attr[in]
+ *   The queue pair attributes.
+ * @return
+ *  A pointer to queue pair on success.
+ */
+struct ibv_qp *ibv_create_qp(struct ibv_pd *pd,
+							 struct ibv_qp_init_attr *qp_init_attr)
+{
+	return mlx4_libverbs.ibv_create_qp(pd, qp_init_attr);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param event[in]
+ *   A pointer to a-synchronic event.
+ */
+void ibv_ack_async_event(struct ibv_async_event *event)
+{
+	return mlx4_libverbs.ibv_ack_async_event(event);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   A ibverbs context.
+ * @param event[in]
+ *   A pointer to a-synchronic event.
+ */
+int ibv_get_async_event(struct ibv_context *context,
+						struct ibv_async_event *event)
+{
+	return mlx4_libverbs.ibv_get_async_event(context, event);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param pd[in]
+ *   The protection domain pointer.
+ * @param addr[in]
+ *   The address.
+ * @param length[in]
+ *   The length.
+ * @param access[in]
+ *   The access type.
+ * @return
+ *  A pointer to memory region on success.
+ */
+struct ibv_mr *ibv_reg_mr(struct ibv_pd *pd, void *addr,
+						  size_t length, int access)
+{
+	return mlx4_libverbs.ibv_reg_mr(pd, addr, length, access);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   Ibverbs context.
+ * @param cqe[in]
+ *   A completion queue entry.
+ * @param cq_context[in]
+ *   Completion queue context.
+ * @param channel[in]
+ *   The completion channel.
+ * @param comp_vector[in]
+ *   Completion vector.
+ * @return
+ *  0 on success.
+ */
+struct ibv_cq *ibv_create_cq(struct ibv_context *context, int cqe,
+							 void *cq_context,
+							 struct ibv_comp_channel *channel,
+							 int comp_vector)
+{
+	return mlx4_libverbs.ibv_create_cq(context, cqe, cq_context, channel,
+									   comp_vector);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param qp[in]
+ *   Queue pair.
+ * @param attr[in]
+ *   The queue pair attribute.
+ * @param attr_mask[in]
+ *   Attribute mask.
+ * @return
+ *  0 on success.
+ */
+int ibv_modify_qp(struct ibv_qp *qp, struct ibv_qp_attr *attr,
+				  int attr_mask)
+{
+	return mlx4_libverbs.ibv_modify_qp(qp, attr, attr_mask);
+}
+/**
+ * Function pointer calls libibverbs API .
+ *
+ * @param context[in]
+ *   An ibverbs context.
+ * @param port_num[in]
+ *   The port number.
+ * @param port_attr[in]
+ *   Port attribute.
+ * @return
+ *  0 on success.
+ */
+int ibv_query_port(struct ibv_context *context, uint8_t port_num,
+				   struct ibv_port_attr *port_attr)
+{
+	port_attr->link_layer = IBV_LINK_LAYER_UNSPECIFIED;
+	port_attr->reserved   = 0;
+	return mlx4_libverbs.ibv_query_port(context, port_num, port_attr);
+}
diff --git a/drivers/net/mlx4/lib/mlx4_dll.h b/drivers/net/mlx4/lib/mlx4_dll.h
new file mode 100644
index 0000000..e95b78e
--- /dev/null
+++ b/drivers/net/mlx4/lib/mlx4_dll.h
@@ -0,0 +1,94 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2015 6WIND S.A.
+ *   Copyright 2015 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef RTE_PMD_MLX4_IBVERBS_H_
+#define RTE_PMD_MLX4_IBVERBS_H_
+#include <infiniband/verbs.h>
+#include <infiniband/mlx4dv.h>
+
+void *mlx4_lib_load(const char *name);
+int mlx4_lverbs_function_register(void *handle);
+int mlx4_lmlx4_function_register(void *handle);
+int mlx4_load_libs(void);
+#undef ibv_query_port
+
+struct {
+	int size;
+	int version;
+	int (*ibv_destroy_qp)(struct ibv_qp *qp);
+	int (*ibv_destroy_cq)(struct ibv_cq *cq);
+	int (*ibv_dealloc_pd)(struct ibv_pd *pd);
+	struct ibv_device **(*ibv_get_device_list)(int *num_devices);
+	int (*ibv_query_device)(struct ibv_context *context,
+							struct ibv_device_attr *device_attr);
+	int (*ibv_close_device)(struct ibv_context *context);
+	void (*ibv_free_device_list)(struct ibv_device **list);
+	struct ibv_context *(*ibv_open_device)(struct ibv_device *device);
+	struct ibv_pd *(*ibv_alloc_pd)(struct ibv_context *context);
+	const char *(*ibv_get_device_name)(struct ibv_device *device);
+	int (*ibv_fork_init)(void);
+	int (*ibv_destroy_comp_channel)(struct ibv_comp_channel *channel);
+	int (*ibv_dereg_mr)(struct ibv_mr *mr);
+	struct ibv_comp_channel *(*ibv_create_comp_channel)(
+							  struct ibv_context *context);
+	int(*ibv_get_cq_event)(struct ibv_comp_channel *channel,
+						   struct ibv_cq **cq, void **cq_context);
+	void (*ibv_ack_cq_events)(struct ibv_cq *cq, unsigned int nevents);
+	struct ibv_qp *(*ibv_create_qp)(struct ibv_pd *pd,
+									struct ibv_qp_init_attr *qp_init_attr);
+	void (*ibv_ack_async_event)(struct ibv_async_event *event);
+	int (*ibv_get_async_event)(struct ibv_context *context,
+							   struct ibv_async_event *event);
+	struct ibv_mr *(*ibv_reg_mr)(struct ibv_pd *pd, void *addr,
+								 size_t length,
+								 int access);
+	struct ibv_cq *(*ibv_create_cq)(struct ibv_context *context,
+									int cqe, void *cq_context,
+									struct ibv_comp_channel *channel,
+									int comp_vector);
+	int (*ibv_modify_qp)(struct ibv_qp *qp, struct ibv_qp_attr *attr,
+						 int attr_mask);
+	int (*ibv_query_port)(struct ibv_context *context, uint8_t port_num,
+						struct ibv_port_attr *port_attr);
+}mlx4_libverbs;
+
+struct {
+	int size;
+	int version;
+	int (*mlx4dv_init_obj)(struct mlx4dv_obj *obj, uint64_t obj_type);
+	int (*mlx4dv_query_device)(struct ibv_context *ctx_in,
+							   struct mlx4dv_context *attrs_out);
+	int (*mlx4dv_set_context_attr)(struct ibv_context *context,
+								enum mlx4dv_set_ctx_attr_type type,
+								void *attr);
+}mlx4_lmlx4;
+#endif /* RTE_PMD_MLX4_IBVERBS_H_ */
diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index f9e4f9d..8fee391 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -49,7 +49,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
@@ -713,7 +717,15 @@ struct mlx4_conf {
 	 * applications to use fork() safely for purposes other than
 	 * using this PMD, which is not supported in forked processes.
 	 */
+#ifdef MLX4_PMD_DLL
+	int ret;
+#endif
 	setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
+#ifdef MLX4_PMD_DLL
+	ret = mlx4_load_libs();
+	if ( ret != 0 )
+		return;
+#endif
 	ibv_fork_init();
 	rte_pci_register(&mlx4_driver);
 }
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index 3aeef87..6e4565b 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -42,7 +42,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_ethdev.c b/drivers/net/mlx4/mlx4_ethdev.c
index 2f69e7d..98134ab 100644
--- a/drivers/net/mlx4/mlx4_ethdev.c
+++ b/drivers/net/mlx4/mlx4_ethdev.c
@@ -56,7 +56,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index 8b87b29..89d6d17 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -49,7 +49,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_mr.c b/drivers/net/mlx4/mlx4_mr.c
index 2a3e269..b494e95 100644
--- a/drivers/net/mlx4/mlx4_mr.c
+++ b/drivers/net/mlx4/mlx4_mr.c
@@ -47,7 +47,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_prm.h b/drivers/net/mlx4/mlx4_prm.h
index fcc7c12..b8854e1 100644
--- a/drivers/net/mlx4/mlx4_prm.h
+++ b/drivers/net/mlx4/mlx4_prm.h
@@ -42,8 +42,12 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PRD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/mlx4dv.h>
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_rxq.c b/drivers/net/mlx4/mlx4_rxq.c
index 53313c5..5680c89 100644
--- a/drivers/net/mlx4/mlx4_rxq.c
+++ b/drivers/net/mlx4/mlx4_rxq.c
@@ -46,8 +46,12 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/mlx4dv.h>
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_rxtx.c b/drivers/net/mlx4/mlx4_rxtx.c
index 2bfa8b1..a876896 100644
--- a/drivers/net/mlx4/mlx4_rxtx.c
+++ b/drivers/net/mlx4/mlx4_rxtx.c
@@ -44,7 +44,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_rxtx.h b/drivers/net/mlx4/mlx4_rxtx.h
index 463df2b..c115032 100644
--- a/drivers/net/mlx4/mlx4_rxtx.h
+++ b/drivers/net/mlx4/mlx4_rxtx.h
@@ -41,8 +41,12 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/mlx4dv.h>
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx4/mlx4_txq.c b/drivers/net/mlx4/mlx4_txq.c
index 7882a4d..8ae9eb9 100644
--- a/drivers/net/mlx4/mlx4_txq.c
+++ b/drivers/net/mlx4/mlx4_txq.c
@@ -46,7 +46,11 @@
 #ifdef PEDANTIC
 #pragma GCC diagnostic ignored "-Wpedantic"
 #endif
+#ifdef MLX4_PMD_DLL
+#include "lib/mlx4_dll.h"
+#else
 #include <infiniband/verbs.h>
+#endif
 #ifdef PEDANTIC
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
diff --git a/drivers/net/mlx5/lib/mlx5_dll.c b/drivers/net/mlx5/lib/mlx5_dll.c
index 2228ad1..d0ff97f 100644
--- a/drivers/net/mlx5/lib/mlx5_dll.c
+++ b/drivers/net/mlx5/lib/mlx5_dll.c
@@ -115,7 +115,7 @@ void *mlx5_lib_load(const char *name)
 		if (dlhandle)
 			return dlhandle;
 	}
-	/* Otherwise use the system libary search path. This is the historical
+	/* Otherwise use the system library search path. This is the historical
 	 * behavior of libibverbs
 	 */
 	if (asprintf(&so_name, "lib%s", name) < 0)
@@ -204,7 +204,7 @@ int mlx5_lverbs_function_register(void *handle)
 		goto exit;
 	}
 	*(void **)(&mlx5_libverbs.ibv_free_device_list) =
-										dlsym(handle, "ibv_free_device_list");
+									dlsym(handle, "ibv_free_device_list");
 	error = dlerror();
 	if ((error) != NULL) {
 		ERROR("%s\n", error);
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 0542c9a..5589482 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -54,6 +54,9 @@ LDFLAGS += --as-needed
 ifeq ($(CONFIG_RTE_LIBRTE_MLX5_DLL),y)
 LDFLAGS += -ldl
 endif
+ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLL),y)
+LDFLAGS += -ldl
+endif
 # default path for libs
 _LDLIBS-y += -L$(RTE_SDK_BIN)/lib
 
@@ -143,7 +146,11 @@ ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_KNI)        += -lrte_pmd_kni
 endif
 _LDLIBS-$(CONFIG_RTE_LIBRTE_LIO_PMD)        += -lrte_pmd_lio
+ifeq ($(CONFIG_RTE_LIBRTE_MLX4_DLL),y)
+_LDLIBS-$(CONFIG_RTE_LIBRTE_MLX4_PMD)       += -lrte_pmd_mlx4
+else
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MLX4_PMD)       += -lrte_pmd_mlx4 -libverbs -lmlx4
+endif
 ifeq ($(CONFIG_RTE_LIBRTE_MLX5_DLL),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_MLX5_PMD)       += -lrte_pmd_mlx5
 else
-- 
1.8.3.1