From 4a38774146f0171a09d5cb1863595b3b546c766e Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Thu, 18 Nov 2010 10:06:41 -0800
Subject: [PATCH] dpif: Make dpif_class 'open' function take class instead of
 type name.

This makes it easier for dpif_provider implementations to share code but
distinguish the class actually in use, because comparing a pointer is
easier than comparing a string.
---
 lib/dpif-linux.c    |  4 ++--
 lib/dpif-netdev.c   |  4 ++--
 lib/dpif-provider.h | 13 +++++++------
 lib/dpif.c          |  4 +++-
 4 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/lib/dpif-linux.c b/lib/dpif-linux.c
index b288cac3..cb218376 100644
--- a/lib/dpif-linux.c
+++ b/lib/dpif-linux.c
@@ -112,8 +112,8 @@ dpif_linux_enumerate(struct svec *all_dps)
 }
 
 static int
-dpif_linux_open(const char *name, const char *type OVS_UNUSED, bool create,
-                struct dpif **dpifp)
+dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
+                bool create, struct dpif **dpifp)
 {
     int minor;
 
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index ff71a4a1..c7179ec1 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -238,8 +238,8 @@ create_dp_netdev(const char *name, int dp_idx, struct dpif **dpifp)
 }
 
 static int
-dpif_netdev_open(const char *name, const char *type OVS_UNUSED, bool create,
-                 struct dpif **dpifp)
+dpif_netdev_open(const struct dpif_class *class OVS_UNUSED, const char *name,
+                 bool create, struct dpif **dpifp)
 {
     if (create) {
         if (find_dp_netdev(name)) {
diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h
index 5d651c6e..e1f10c47 100644
--- a/lib/dpif-provider.h
+++ b/lib/dpif-provider.h
@@ -90,13 +90,14 @@ struct dpif_class {
 
     /* Attempts to open an existing dpif called 'name', if 'create' is false,
      * or to open an existing dpif or create a new one, if 'create' is true.
-     * 'type' corresponds to the 'type' field used in the dpif_class
-     * structure.
      *
-     * If successful, stores a pointer to the new dpif in '*dpifp'.  On failure
-     * there are no requirements on what is stored in '*dpifp'. */
-    int (*open)(const char *name, const char *type, bool create,
-                struct dpif **dpifp);
+     * 'dpif_class' is the class of dpif to open.
+     *
+     * If successful, stores a pointer to the new dpif in '*dpifp', which must
+     * have class 'dpif_class'.  On failure there are no requirements on what
+     * is stored in '*dpifp'. */
+    int (*open)(const struct dpif_class *dpif_class,
+                const char *name, bool create, struct dpif **dpifp);
 
     /* Closes 'dpif' and frees associated memory. */
     void (*close)(struct dpif *dpif);
diff --git a/lib/dpif.c b/lib/dpif.c
index 30384196..ea806dc1 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -258,8 +258,10 @@ do_open(const char *name, const char *type, bool create, struct dpif **dpifp)
         goto exit;
     }
 
-    error = registered_class->dpif_class->open(name, type, create, &dpif);
+    error = registered_class->dpif_class->open(registered_class->dpif_class,
+                                               name, create, &dpif);
     if (!error) {
+        assert(dpif->dpif_class == registered_class->dpif_class);
         registered_class->refcount++;
     }
 
-- 
2.30.2