net/mlx4: spawn rdma-core dependency plug-in

[dpdk.git] / drivers / net / mlx4 / mlx4.c

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index feabbb8..50a55ee 100644 (file)
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -37,6 +37,7 @@
  */
 
 #include <assert.h>
+#include <dlfcn.h>
 #include <errno.h>
 #include <inttypes.h>
 #include <stddef.h>
@@ -44,6 +45,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 /* Verbs headers do not support -pedantic. */
 #ifdef PEDANTIC
@@ -55,6 +57,7 @@
 #endif
 
 #include <rte_common.h>
+#include <rte_config.h>
 #include <rte_dev.h>
 #include <rte_errno.h>
 #include <rte_ethdev_driver.h>
@@ -730,6 +733,47 @@ static struct rte_pci_driver mlx4_driver = {
                     RTE_PCI_DRV_INTR_RMV,
 };
 
+#ifdef RTE_LIBRTE_MLX4_DLOPEN_DEPS
+
+/**
+ * Initialization routine for run-time dependency on rdma-core.
+ */
+static int
+mlx4_glue_init(void)
+{
+       void *handle = NULL;
+       void **sym;
+       const char *dlmsg;
+
+       handle = dlopen(MLX4_GLUE, RTLD_LAZY);
+       if (!handle) {
+               rte_errno = EINVAL;
+               dlmsg = dlerror();
+               if (dlmsg)
+                       WARN("cannot load glue library: %s", dlmsg);
+               goto glue_error;
+       }
+       sym = dlsym(handle, "mlx4_glue");
+       if (!sym || !*sym) {
+               rte_errno = EINVAL;
+               dlmsg = dlerror();
+               if (dlmsg)
+                       ERROR("cannot resolve glue symbol: %s", dlmsg);
+               goto glue_error;
+       }
+       mlx4_glue = *sym;
+       return 0;
+glue_error:
+       if (handle)
+               dlclose(handle);
+       WARN("cannot initialize PMD due to missing run-time"
+            " dependency on rdma-core libraries (libibverbs,"
+            " libmlx4)");
+       return -rte_errno;
+}
+
+#endif
+
 /**
  * Driver initialization routine.
  */
@@ -750,6 +794,11 @@ rte_mlx4_pmd_init(void)
         * using this PMD, which is not supported in forked processes.
         */
        setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
+#ifdef RTE_LIBRTE_MLX4_DLOPEN_DEPS
+       if (mlx4_glue_init())
+               return;
+       assert(mlx4_glue);
+#endif
        mlx4_glue->fork_init();
        rte_pci_register(&mlx4_driver);
 }