ethdev: replace bus specific struct with generic dev

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

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index ee93daf..f389e66 100644 (file)
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright 2012 6WIND S.A.
- * Copyright 2012 Mellanox
+ * Copyright 2012 Mellanox Technologies, Ltd
  */
 
 /**
@@ -707,12 +707,54 @@ static struct rte_pci_driver mlx4_driver = {
 
 #ifdef RTE_LIBRTE_MLX4_DLOPEN_DEPS
 
+/**
+ * Suffix RTE_EAL_PMD_PATH with "-glue".
+ *
+ * This function performs a sanity check on RTE_EAL_PMD_PATH before
+ * suffixing its last component.
+ *
+ * @param buf[out]
+ *   Output buffer, should be large enough otherwise NULL is returned.
+ * @param size
+ *   Size of @p out.
+ *
+ * @return
+ *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
+ */
+static char *
+mlx4_glue_path(char *buf, size_t size)
+{
+       static const char *const bad[] = { "/", ".", "..", NULL };
+       const char *path = RTE_EAL_PMD_PATH;
+       size_t len = strlen(path);
+       size_t off;
+       int i;
+
+       while (len && path[len - 1] == '/')
+               --len;
+       for (off = len; off && path[off - 1] != '/'; --off)
+               ;
+       for (i = 0; bad[i]; ++i)
+               if (!strncmp(path + off, bad[i], (int)(len - off)))
+                       goto error;
+       i = snprintf(buf, size, "%.*s-glue", (int)len, path);
+       if (i == -1 || (size_t)i >= size)
+               goto error;
+       return buf;
+error:
+       ERROR("unable to append \"-glue\" to last component of"
+             " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
+             " please re-configure DPDK");
+       return NULL;
+}
+
 /**
  * Initialization routine for run-time dependency on rdma-core.
  */
 static int
 mlx4_glue_init(void)
 {
+       char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
        const char *path[] = {
                /*
                 * A basic security check is necessary before trusting
@@ -720,7 +762,13 @@ mlx4_glue_init(void)
                 */
                (geteuid() == getuid() && getegid() == getgid() ?
                 getenv("MLX4_GLUE_PATH") : NULL),
-               RTE_EAL_PMD_PATH,
+               /*
+                * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
+                * variant, otherwise let dlopen() look up libraries on its
+                * own.
+                */
+               (*RTE_EAL_PMD_PATH ?
+                mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
        };
        unsigned int i = 0;
        void *handle = NULL;