xref: /freebsd-10-stable/contrib/ofed/libibverbs/src/kern_abi.h

/*
 * 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 */