[PATCH libibverbs v5 1/7] Infrastructure to support verbs extensions

[sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org]

From: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Infrastructure to support extended verbs capabilities in a forward/backward
manner.

Support for extensions is determeind by the provider calling
verbs_register_driver in place of ibv_register_driver.  When
extensions are enabled, ibverbs sets the current alloc_context /
free_context device operations to NULL.  These are used to
indicate that the struct ibv_device may be cast to struct
verbs_device.

With extensions, ibverbs allocates the ibv_context structure
and calls into the provider to initialize it.  The init call
is part of the verbs_device struct.

The abi_compat field of struct ibv_context is used to determine
support of verbs extensions.  As a result, support for ABI version <
2 is removed (corresponds to kernel releases 2.6.11-2.6.14 no
longer being supported).  The lowest ABI now supported is 3 (really
4 since 2.6.15 was ABI 4, I don't see that ABI 3 was in a release).

Signed-off-by: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Tzahi Oved <tzahio-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
change from v4:
Bumped minimum ABI support to 3.

 include/infiniband/driver.h   |    3 +
 include/infiniband/kern-abi.h |   43 +--------------
 include/infiniband/verbs.h    |   55 ++++++++++++++++++
 src/cmd.c                     |  125 +----------------------------------------
 src/device.c                  |   54 +++++++++++++----
 src/init.c                    |   41 +++++++++++--
 src/kern_abi.h                |  101 ---------------------------------
 src/libibverbs.map            |    1 +
 8 files changed, 137 insertions(+), 286 deletions(-)
 delete mode 100644 src/kern_abi.h

diff --git a/include/infiniband/driver.h b/include/infiniband/driver.h
index 9a81416..f22f287 100644
--- a/include/infiniband/driver.h
+++ b/include/infiniband/driver.h
@@ -55,8 +55,11 @@
 
 typedef struct ibv_device *(*ibv_driver_init_func)(const char *uverbs_sys_path,
 						   int abi_version);
+typedef struct verbs_device *(*verbs_driver_init_func)(const char *uverbs_sys_path,
+						       int abi_version);
 
 void ibv_register_driver(const char *name, ibv_driver_init_func init_func);
+void verbs_register_driver(const char *name, verbs_driver_init_func init_func);
 int ibv_cmd_get_context(struct ibv_context *context, struct ibv_get_context *cmd,
 			size_t cmd_size, struct ibv_get_context_resp *resp,
 			size_t resp_size);
diff --git a/include/infiniband/kern-abi.h b/include/infiniband/kern-abi.h
index 619ea7e..e7f8981 100644
--- a/include/infiniband/kern-abi.h
+++ b/include/infiniband/kern-abi.h
@@ -45,7 +45,7 @@
 /*
  * The minimum and maximum kernel ABI that we can handle.
  */
-#define IB_USER_VERBS_MIN_ABI_VERSION	1
+#define IB_USER_VERBS_MIN_ABI_VERSION	3
 #define IB_USER_VERBS_MAX_ABI_VERSION	6
 
 enum {
@@ -806,47 +806,6 @@ enum {
 	IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL_V2 = -1,
 };
 
-struct ibv_destroy_cq_v1 {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u32 cq_handle;
-};
-
-struct ibv_destroy_qp_v1 {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u32 qp_handle;
-};
-
-struct ibv_destroy_srq_v1 {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u32 srq_handle;
-};
-
-struct ibv_get_context_v2 {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u64 response;
-	__u64 cq_fd_tab;
-	__u64 driver_data[0];
-};
-
-struct ibv_create_cq_v2 {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u64 response;
-	__u64 user_handle;
-	__u32 cqe;
-	__u32 event_handler;
-	__u64 driver_data[0];
-};
-
 struct ibv_modify_srq_v3 {
 	__u32 command;
 	__u16 in_words;
diff --git a/include/infiniband/verbs.h b/include/infiniband/verbs.h
index 6acfc81..e4361aa 100644
--- a/include/infiniband/verbs.h
+++ b/include/infiniband/verbs.h
@@ -38,6 +38,7 @@
 
 #include <stdint.h>
 #include <pthread.h>
+#include <stddef.h>
 
 #ifdef __cplusplus
 #  define BEGIN_C_DECLS extern "C" {
@@ -63,6 +64,19 @@ union ibv_gid {
 	} global;
 };
 
+#ifndef container_of
+/**
+  * container_of - cast a member of a structure out to the containing structure
+  * @ptr:        the pointer to the member.
+  * @type:       the type of the container struct this is embedded in.
+  * @member:     the name of the member within the struct.
+  *
+ */
+#define container_of(ptr, type, member) ({\
+	const typeof(((type *)0)->member) * __mptr = (ptr);\
+	(type *)((char *)__mptr - offsetof(type, member)); })
+#endif
+
 enum ibv_node_type {
 	IBV_NODE_UNKNOWN	= -1,
 	IBV_NODE_CA 		= 1,
@@ -634,6 +648,17 @@ struct ibv_device {
 	char			ibdev_path[IBV_SYSFS_PATH_MAX];
 };
 
+struct verbs_device {
+	struct ibv_device device; /* Must be first */
+	size_t	sz;
+	size_t	size_of_context;
+	int	(*init_context)(struct verbs_device *device,
+				struct ibv_context *ctx, int cmd_fd);
+	void	(*uninit_context)(struct verbs_device *device,
+				struct ibv_context *ctx);
+	/* future fields added here */
+};
+
 struct ibv_context_ops {
 	int			(*query_device)(struct ibv_context *context,
 					      struct ibv_device_attr *device_attr);
@@ -702,6 +727,36 @@ struct ibv_context {
 	void		       *abi_compat;
 };
 
+enum verbs_context_mask {
+	VERBS_CONTEXT_RESERVED = 1 << 0
+};
+
+struct verbs_context {
+	/*  "grows up" - new fields go here */
+	uint64_t has_comp_mask;
+	size_t   sz;	/* Must be immediately before struct ibv_context */
+	struct ibv_context context;/* Must be last field in the struct */
+};
+
+static inline struct verbs_context *verbs_get_ctx(
+					const struct ibv_context *ctx)
+{
+	return (ctx->abi_compat != ((uint8_t *) NULL) - 1) ?
+		NULL : container_of(ctx, struct verbs_context, context);
+}
+
+#define verbs_get_ctx_op(ctx, op) ({ \
+	struct verbs_context *vctx = verbs_get_ctx(ctx); \
+	(!vctx || (vctx->sz < sizeof(*vctx) - offsetof(struct verbs_context, op)) || \
+	 !vctx->op) ? NULL : vctx; })
+
+static inline struct verbs_device *verbs_get_device(
+					const struct ibv_device *dev)
+{
+	return (dev->ops.alloc_context) ?
+		NULL : container_of(dev, struct verbs_device, device);
+}
+
 /**
  * ibv_get_device_list - Get list of IB devices currently available
  * @num_devices: optional.  if non-NULL, set to the number of devices
diff --git a/src/cmd.c b/src/cmd.c
index 9789092..86350fd 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -45,52 +45,13 @@
 
 #include "ibverbs.h"
 
-static int ibv_cmd_get_context_v2(struct ibv_context *context,
-				  struct ibv_get_context *new_cmd,
-				  size_t new_cmd_size,
-				  struct ibv_get_context_resp *resp,
-				  size_t resp_size)
-{
-	struct ibv_abi_compat_v2 *t;
-	struct ibv_get_context_v2 *cmd;
-	size_t cmd_size;
-	uint32_t cq_fd;
-
-	t = malloc(sizeof *t);
-	if (!t)
-		return ENOMEM;
-	pthread_mutex_init(&t->in_use, NULL);
-
-	cmd_size = sizeof *cmd + new_cmd_size - sizeof *new_cmd;
-	cmd      = alloca(cmd_size);
-	memcpy(cmd->driver_data, new_cmd->driver_data, new_cmd_size - sizeof *new_cmd);
-
-	IBV_INIT_CMD_RESP(cmd, cmd_size, GET_CONTEXT, resp, resp_size);
-	cmd->cq_fd_tab = (uintptr_t) &cq_fd;
-
-	if (write(context->cmd_fd, cmd, cmd_size) != cmd_size) {
-		free(t);
-		return errno;
-	}
-
-	(void) VALGRIND_MAKE_MEM_DEFINED(resp, resp_size);
-
-	context->async_fd         = resp->async_fd;
-	context->num_comp_vectors = 1;
-	t->channel.context        = context;
-	t->channel.fd		  = cq_fd;
-	t->channel.refcnt	  = 0;
-	context->abi_compat       = t;
-
-	return 0;
-}
 
 int ibv_cmd_get_context(struct ibv_context *context, struct ibv_get_context *cmd,
 			size_t cmd_size, struct ibv_get_context_resp *resp,
 			size_t resp_size)
 {
-	if (abi_ver <= 2)
-		return ibv_cmd_get_context_v2(context, cmd, cmd_size, resp, resp_size);
+	if (abi_ver < IB_USER_VERBS_MIN_ABI_VERSION)
+		return ENOSYS;
 
 	IBV_INIT_CMD_RESP(cmd, cmd_size, GET_CONTEXT, resp, resp_size);
 
@@ -274,45 +235,12 @@ int ibv_cmd_dereg_mr(struct ibv_mr *mr)
 	return 0;
 }
 
-static int ibv_cmd_create_cq_v2(struct ibv_context *context, int cqe,
-				struct ibv_cq *cq,
-				struct ibv_create_cq *new_cmd, size_t new_cmd_size,
-				struct ibv_create_cq_resp *resp, size_t resp_size)
-{
-	struct ibv_create_cq_v2 *cmd;
-	size_t cmd_size;
-
-	cmd_size = sizeof *cmd + new_cmd_size - sizeof *new_cmd;
-	cmd      = alloca(cmd_size);
-	memcpy(cmd->driver_data, new_cmd->driver_data, new_cmd_size - sizeof *new_cmd);
-
-	IBV_INIT_CMD_RESP(cmd, cmd_size, CREATE_CQ, resp, resp_size);
-	cmd->user_handle   = (uintptr_t) cq;
-	cmd->cqe           = cqe;
-	cmd->event_handler = 0;
-
-	if (write(context->cmd_fd, cmd, cmd_size) != cmd_size)
-		return errno;
-
-	(void) VALGRIND_MAKE_MEM_DEFINED(resp, resp_size);
-
-	cq->handle  = resp->cq_handle;
-	cq->cqe     = resp->cqe;
-	cq->context = context;
-
-	return 0;
-}
-
 int ibv_cmd_create_cq(struct ibv_context *context, int cqe,
 		      struct ibv_comp_channel *channel,
 		      int comp_vector, struct ibv_cq *cq,
 		      struct ibv_create_cq *cmd, size_t cmd_size,
 		      struct ibv_create_cq_resp *resp, size_t resp_size)
 {
-	if (abi_ver <= 2)
-		return ibv_cmd_create_cq_v2(context, cqe, cq,
-					    cmd, cmd_size, resp, resp_size);
-
 	IBV_INIT_CMD_RESP(cmd, cmd_size, CREATE_CQ, resp, resp_size);
 	cmd->user_handle   = (uintptr_t) cq;
 	cmd->cqe           = cqe;
@@ -397,7 +325,6 @@ int ibv_cmd_resize_cq(struct ibv_cq *cq, int cqe,
 		      struct ibv_resize_cq *cmd, size_t cmd_size,
 		      struct ibv_resize_cq_resp *resp, size_t resp_size)
 {
-
 	IBV_INIT_CMD_RESP(cmd, cmd_size, RESIZE_CQ, resp, resp_size);
 	cmd->cq_handle = cq->handle;
 	cmd->cqe       = cqe;
@@ -412,27 +339,11 @@ int ibv_cmd_resize_cq(struct ibv_cq *cq, int cqe,
 	return 0;
 }
 
-static int ibv_cmd_destroy_cq_v1(struct ibv_cq *cq)
-{
-	struct ibv_destroy_cq_v1 cmd;
-
-	IBV_INIT_CMD(&cmd, sizeof cmd, DESTROY_CQ);
-	cmd.cq_handle = cq->handle;
-
-	if (write(cq->context->cmd_fd, &cmd, sizeof cmd) != sizeof cmd)
-		return errno;
-
-	return 0;
-}
-
 int ibv_cmd_destroy_cq(struct ibv_cq *cq)
 {
 	struct ibv_destroy_cq      cmd;
 	struct ibv_destroy_cq_resp resp;
 
-	if (abi_ver == 1)
-		return ibv_cmd_destroy_cq_v1(cq);
-
 	IBV_INIT_CMD_RESP(&cmd, sizeof cmd, DESTROY_CQ, &resp, sizeof resp);
 	cmd.cq_handle = cq->handle;
 	cmd.reserved  = 0;
@@ -557,27 +468,11 @@ int ibv_cmd_query_srq(struct ibv_srq *srq, struct ibv_srq_attr *srq_attr,
 	return 0;
 }
 
-static int ibv_cmd_destroy_srq_v1(struct ibv_srq *srq)
-{
-	struct ibv_destroy_srq_v1 cmd;
-
-	IBV_INIT_CMD(&cmd, sizeof cmd, DESTROY_SRQ);
-	cmd.srq_handle = srq->handle;
-
-	if (write(srq->context->cmd_fd, &cmd, sizeof cmd) != sizeof cmd)
-		return errno;
-
-	return 0;
-}
-
 int ibv_cmd_destroy_srq(struct ibv_srq *srq)
 {
 	struct ibv_destroy_srq      cmd;
 	struct ibv_destroy_srq_resp resp;
 
-	if (abi_ver == 1)
-		return ibv_cmd_destroy_srq_v1(srq);
-
 	IBV_INIT_CMD_RESP(&cmd, sizeof cmd, DESTROY_SRQ, &resp, sizeof resp);
 	cmd.srq_handle = srq->handle;
 	cmd.reserved   = 0;
@@ -799,19 +694,6 @@ int ibv_cmd_modify_qp(struct ibv_qp *qp, struct ibv_qp_attr *attr,
 	return 0;
 }
 
-static int ibv_cmd_destroy_qp_v1(struct ibv_qp *qp)
-{
-	struct ibv_destroy_qp_v1 cmd;
-
-	IBV_INIT_CMD(&cmd, sizeof cmd, DESTROY_QP);
-	cmd.qp_handle = qp->handle;
-
-	if (write(qp->context->cmd_fd, &cmd, sizeof cmd) != sizeof cmd)
-		return errno;
-
-	return 0;
-}
-
 int ibv_cmd_post_send(struct ibv_qp *ibqp, struct ibv_send_wr *wr,
 		      struct ibv_send_wr **bad_wr)
 {
@@ -1074,9 +956,6 @@ int ibv_cmd_destroy_qp(struct ibv_qp *qp)
 	struct ibv_destroy_qp      cmd;
 	struct ibv_destroy_qp_resp resp;
 
-	if (abi_ver == 1)
-		return ibv_cmd_destroy_qp_v1(qp);
-
 	IBV_INIT_CMD_RESP(&cmd, sizeof cmd, DESTROY_QP, &resp, sizeof resp);
 	cmd.qp_handle = qp->handle;
 	cmd.reserved  = 0;
diff --git a/src/device.c b/src/device.c
index 5798895..448a243 100644
--- a/src/device.c
+++ b/src/device.c
@@ -124,9 +124,11 @@ default_symver(__ibv_get_device_guid, ibv_get_device_guid);
 
 struct ibv_context *__ibv_open_device(struct ibv_device *device)
 {
+	struct verbs_device *verbs_device = verbs_get_device(device);
 	char *devpath;
-	int cmd_fd;
+	int cmd_fd, ret;
 	struct ibv_context *context;
+	struct verbs_context *context_ex;
 
 	if (asprintf(&devpath, "/dev/infiniband/%s", device->dev_name) < 0)
 		return NULL;
@@ -141,9 +143,33 @@ struct ibv_context *__ibv_open_device(struct ibv_device *device)
 	if (cmd_fd < 0)
 		return NULL;
 
-	context = device->ops.alloc_context(device, cmd_fd);
-	if (!context)
-		goto err;
+	if (!verbs_device) {
+		context = device->ops.alloc_context(device, cmd_fd);
+		if (!context)
+			goto err;
+	} else {
+		/* Library now allocates the context */
+		context_ex = calloc(1, sizeof(*context_ex) +
+				       verbs_device->size_of_context);
+		if (!context_ex) {
+			errno = ENOMEM;
+			goto err;
+		}
+
+		context_ex->context.abi_compat  = ((uint8_t *) NULL) - 1;
+		context_ex->sz = sizeof(*context_ex);
+
+		context = &context_ex->context;
+		ret = verbs_device->init_context(verbs_device, context, cmd_fd);
+		if (ret)
+			goto verbs_err;
+
+		/* initialize *all* library ops to either lib calls or
+		 * directly to provider calls.
+		 * context_ex->lib_new_func1 = __verbs_new_func1;
+		 * context_ex->lib_new_func2 = __verbs_new_func2;
+		 */
+	}
 
 	context->device = device;
 	context->cmd_fd = cmd_fd;
@@ -151,9 +177,10 @@ struct ibv_context *__ibv_open_device(struct ibv_device *device)
 
 	return context;
 
+verbs_err:
+	free(context_ex);
 err:
 	close(cmd_fd);
-
 	return NULL;
 }
 default_symver(__ibv_open_device, ibv_open_device);
@@ -163,14 +190,15 @@ int __ibv_close_device(struct ibv_context *context)
 	int async_fd = context->async_fd;
 	int cmd_fd   = context->cmd_fd;
 	int cq_fd    = -1;
-
-	if (abi_ver <= 2) {
-		struct ibv_abi_compat_v2 *t = context->abi_compat;
-		cq_fd = t->channel.fd;
-		free(context->abi_compat);
-	}
-
-	context->device->ops.free_context(context);
+	struct verbs_context *context_ex;
+
+	context_ex = verbs_get_ctx(context);
+	if (context_ex) {
+		struct verbs_device *verbs_device = verbs_get_device(context->device);
+		verbs_device->uninit_context(verbs_device, context);
+		free(context_ex);
+	} else
+		context->device->ops.free_context(context);
 
 	close(async_fd);
 	close(cmd_fd);
diff --git a/src/init.c b/src/init.c
index 8d6786e..d6cd84a 100644
--- a/src/init.c
+++ b/src/init.c
@@ -70,6 +70,7 @@ struct ibv_driver_name {
 struct ibv_driver {
 	const char	       *name;
 	ibv_driver_init_func	init_func;
+	verbs_driver_init_func	verbs_init_func;
 	struct ibv_driver      *next;
 };
 
@@ -153,7 +154,8 @@ static int find_sysfs_devs(void)
 	return ret;
 }
 
-void ibv_register_driver(const char *name, ibv_driver_init_func init_func)
+static void register_driver(const char *name, ibv_driver_init_func init_func,
+			    verbs_driver_init_func verbs_init_func)
 {
 	struct ibv_driver *driver;
 
@@ -163,9 +165,10 @@ void ibv_register_driver(const char *name, ibv_driver_init_func init_func)
 		return;
 	}
 
-	driver->name      = name;
-	driver->init_func = init_func;
-	driver->next      = NULL;
+	driver->name      	= name;
+	driver->init_func	= init_func;
+	driver->verbs_init_func = verbs_init_func;
+	driver->next      	= NULL;
 
 	if (tail_driver)
 		tail_driver->next = driver;
@@ -174,6 +177,19 @@ void ibv_register_driver(const char *name, ibv_driver_init_func init_func)
 	tail_driver = driver;
 }
 
+void ibv_register_driver(const char *name, ibv_driver_init_func init_func)
+{
+	register_driver(name, init_func, NULL);
+}
+
+/* New registration symbol with same functionality - used by providers to
+  * validate that library supports verbs extension.
+  */
+void verbs_register_driver(const char *name, verbs_driver_init_func init_func)
+{
+	register_driver(name, NULL, init_func);
+}
+
 static void load_driver(const char *name)
 {
 	char *so_name;
@@ -333,12 +349,23 @@ out:
 static struct ibv_device *try_driver(struct ibv_driver *driver,
 				     struct ibv_sysfs_dev *sysfs_dev)
 {
+	struct verbs_device *vdev;
 	struct ibv_device *dev;
 	char value[8];
 
-	dev = driver->init_func(sysfs_dev->sysfs_path, sysfs_dev->abi_ver);
-	if (!dev)
-		return NULL;
+	if (driver->init_func) {
+		dev = driver->init_func(sysfs_dev->sysfs_path, sysfs_dev->abi_ver);
+		if (!dev)
+			return NULL;
+	} else {
+		vdev = driver->verbs_init_func(sysfs_dev->sysfs_path, sysfs_dev->abi_ver);
+		if (!vdev)
+			return NULL;
+
+		dev = &vdev->device;
+		dev->ops.alloc_context = NULL;
+		dev->ops.free_context = NULL;
+	}
 
 	if (ibv_read_sysfs_file(sysfs_dev->ibdev_path, "node_type", value, sizeof value) < 0) {
 		fprintf(stderr, PFX "Warning: no node_type attr under %s.\n",
diff --git a/src/kern_abi.h b/src/kern_abi.h
deleted file mode 100644
index e055e75..0000000
--- a/src/kern_abi.h
+++ /dev/null
@@ -1,101 +0,0 @@
-/*
- * Copyright (c) 2005 Topspin Communications.  All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses.  You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- *     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.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#ifndef KERN_ABI_H
-#define KERN_ABI_H
-
-#include <linux/types.h>
-
-/*
- * Increment this value if any changes that break userspace ABI
- * compatibility are made.
- */
-#define IB_USER_VERBS_ABI_VERSION	1
-
-enum {
-	IB_USER_VERBS_CMD_GET_CONTEXT,
-	IB_USER_VERBS_CMD_GET_EVENT_FDS,
-	IB_USER_VERBS_CMD_ALLOC_PD,
-	IB_USER_VERBS_CMD_DEALLOC_PD,
-	IB_USER_VERBS_CMD_REG_MR,
-	IB_USER_VERBS_CMD_DEREG_MR
-};
-
-/*
- * Make sure that all structs defined in this file remain laid out so
- * that they pack the same way on 32-bit and 64-bit architectures (to
- * avoid incompatibility between 32-bit userspace and 64-bit kernels).
- * In particular do not use pointer types -- pass pointers in __u64
- * instead.
- */
-
-struct ibv_kern_async_event {
-	__u32 event_type;
-	__u32 element;
-};
-
-struct ibv_comp_event {
-	__u32 cq_handle;
-};
-
-/*
- * All commands from userspace should start with a __u32 command field
- * followed by __u16 in_words and out_words fields (which give the
- * length of the command block and response buffer if any in 32-bit
- * words).  The kernel driver will read these fields first and read
- * the rest of the command struct based on these value.
- */
-
-struct ibv_get_context {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u64 response;
-};
-
-struct ibv_get_context_resp {
-	__u32 num_cq_events;
-};
-
-struct ibv_get_event_fds {
-	__u32 command;
-	__u16 in_words;
-	__u16 out_words;
-	__u64 response;
-};
-
-struct ibv_get_event_fds_resp {
-	__u32 async_fd;
-	__u32 cq_fd[1];
-};
-
-#endif /* KERN_ABI_H */
diff --git a/src/libibverbs.map b/src/libibverbs.map
index 1827da0..ee9adea 100644
--- a/src/libibverbs.map
+++ b/src/libibverbs.map
@@ -91,6 +91,7 @@ IBVERBS_1.1 {
 		ibv_dontfork_range;
 		ibv_dofork_range;
 		ibv_register_driver;
+		verbs_register_driver;
 
 		ibv_node_type_str;
 		ibv_port_state_str;
-- 
1.7.3

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