datapath: Add 32-bit compatibility ioctls.

When a 32-bit userspace program runs on a 64-bit kernel, data structures
that contain members whose sizes or alignments change from 32- to 64-bit
must be translated when they are passed to ioctls.  This commit adds such
support for openvswitch_mod.

We should really reconsider some parts of the Open vSwitch ioctl interface
to avoid needing as much translation as we do.

Lightly tested with 32-bit userspace on sparc64.

1 files changed, 83 insertions, 0 deletions

diff --git a/datapath/odp-compat.h b/datapath/odp-compat.h
new file mode 100644
index 00000000..3d7b803f
--- /dev/null
+++ b/datapath/odp-compat.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2010 Nicira Networks.
+ * Distributed under the terms of the GNU GPL version 2.
+ *
+ * Significant portions of this file may be copied from parts of the Linux
+ * kernel, by Linus Torvalds and others.
+ */
+
+#ifndef ODP_COMPAT_H
+#define ODP_COMPAT_H 1
+
+/* 32-bit ioctl compatibility definitions for datapath protocol. */
+
+#ifdef CONFIG_COMPAT
+#include "openvswitch/datapath-protocol.h"
+#include <linux/compat.h>
+
+#define ODP_PORT_LIST32		_IOWR('O', 10, struct compat_odp_portvec)
+#define ODP_PORT_GROUP_SET32	_IOR('O', 11, struct compat_odp_port_group)
+#define ODP_PORT_GROUP_GET32	_IOWR('O', 12, struct compat_odp_port_group)
+#define ODP_FLOW_GET32		_IOWR('O', 13, struct compat_odp_flow)
+#define ODP_FLOW_PUT32		_IOWR('O', 14, struct compat_odp_flow)
+#define ODP_FLOW_LIST32		_IOWR('O', 15, struct compat_odp_flowvec)
+#define ODP_FLOW_DEL32		_IOWR('O', 17, struct compat_odp_flow)
+#define ODP_EXECUTE32		_IOR('O', 18, struct compat_odp_execute)
+#define ODP_FLOW_DEL32		_IOWR('O', 17, struct compat_odp_flow)
+#define ODP_VPORT_ADD32		_IOR('O', 21, struct compat_odp_vport_add)
+#define ODP_VPORT_MOD32		_IOR('O', 22, struct compat_odp_vport_mod)
+
+struct compat_odp_portvec {
+	compat_uptr_t ports;
+	u32 n_ports;
+};
+
+struct compat_odp_port_group {
+	compat_uptr_t ports;
+	u16 n_ports;		/* Number of ports. */
+	u16 group;		/* Group number. */
+};
+
+struct compat_odp_flow {
+	struct odp_flow_stats stats;
+	struct odp_flow_key key;
+	compat_uptr_t actions;
+	u32 n_actions;
+	u32 flags;
+};
+
+struct compat_odp_flow_put {
+	struct compat_odp_flow flow;
+	u32 flags;
+};
+
+struct compat_odp_flowvec {
+	compat_uptr_t flows;
+	u32 n_flows;
+};
+
+struct compat_odp_execute {
+	u16 in_port;
+	u16 reserved1;
+	u32 reserved2;
+
+	compat_uptr_t actions;
+	u32 n_actions;
+
+	compat_uptr_t data;
+	u32 length;
+};
+
+struct compat_odp_vport_add {
+	char port_type[VPORT_TYPE_SIZE];
+	char devname[16];	     /* IFNAMSIZ */
+	compat_uptr_t config;
+};
+
+struct compat_odp_vport_mod {
+	char devname[16];	     /* IFNAMSIZ */
+	compat_uptr_t config;
+};
+#endif	/* CONFIG_COMPAT */
+
+#endif	/* odp-compat.h */