linux/drivers/net/ethernet/netronome/nfp/bpf/fw.h

/*
 * Copyright (C) 2017-2018 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. 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 NFP_BPF_FW_H
#define NFP_BPF_FW_H 1

#include <linux/bitops.h>
#include <linux/types.h>

/* Kernel's enum bpf_reg_type is not uABI so people may change it breaking
 * our FW ABI.  In that case we will do translation in the driver.
 */
#define NFP_BPF_SCALAR_VALUE		1
#define NFP_BPF_MAP_VALUE		4
#define NFP_BPF_STACK			6
#define NFP_BPF_PACKET_DATA		8

enum bpf_cap_tlv_type {
	NFP_BPF_CAP_TYPE_FUNC		= 1,
	NFP_BPF_CAP_TYPE_ADJUST_HEAD	= 2,
	NFP_BPF_CAP_TYPE_MAPS		= 3,
	NFP_BPF_CAP_TYPE_RANDOM		= 4,
	NFP_BPF_CAP_TYPE_QUEUE_SELECT	= 5,
	NFP_BPF_CAP_TYPE_ADJUST_TAIL	= 6,
	NFP_BPF_CAP_TYPE_ABI_VERSION	= 7,
};

struct nfp_bpf_cap_tlv_func {
	__le32 func_id;
	__le32 func_addr;
};

struct nfp_bpf_cap_tlv_adjust_head {
	__le32 flags;
	__le32 off_min;
	__le32 off_max;
	__le32 guaranteed_sub;
	__le32 guaranteed_add;
};

#define NFP_BPF_ADJUST_HEAD_NO_META	BIT(0)

struct nfp_bpf_cap_tlv_maps {
	__le32 types;
	__le32 max_maps;
	__le32 max_elems;
	__le32 max_key_sz;
	__le32 max_val_sz;
	__le32 max_elem_sz;
};

/*
 * Types defined for map related control messages
 */
#define CMSG_MAP_ABI_VERSION		1

enum nfp_bpf_cmsg_type {
	CMSG_TYPE_MAP_ALLOC	= 1,
	CMSG_TYPE_MAP_FREE	= 2,
	CMSG_TYPE_MAP_LOOKUP	= 3,
	CMSG_TYPE_MAP_UPDATE	= 4,
	CMSG_TYPE_MAP_DELETE	= 5,
	CMSG_TYPE_MAP_GETNEXT	= 6,
	CMSG_TYPE_MAP_GETFIRST	= 7,
	CMSG_TYPE_BPF_EVENT	= 8,
	__CMSG_TYPE_MAP_MAX,
};

#define CMSG_TYPE_MAP_REPLY_BIT		7
#define __CMSG_REPLY(req)		(BIT(CMSG_TYPE_MAP_REPLY_BIT) | (req))

/* BPF ABIv2 fixed-length control message fields */
#define CMSG_MAP_KEY_LW			16
#define CMSG_MAP_VALUE_LW		16

enum nfp_bpf_cmsg_status {
	CMSG_RC_SUCCESS			= 0,
	CMSG_RC_ERR_MAP_FD		= 1,
	CMSG_RC_ERR_MAP_NOENT		= 2,
	CMSG_RC_ERR_MAP_ERR		= 3,
	CMSG_RC_ERR_MAP_PARSE		= 4,
	CMSG_RC_ERR_MAP_EXIST		= 5,
	CMSG_RC_ERR_MAP_NOMEM		= 6,
	CMSG_RC_ERR_MAP_E2BIG		= 7,
};

struct cmsg_hdr {
	u8 type;
	u8 ver;
	__be16 tag;
};

struct cmsg_reply_map_simple {
	struct cmsg_hdr hdr;
	__be32 rc;
};

struct cmsg_req_map_alloc_tbl {
	struct cmsg_hdr hdr;
	__be32 key_size;		/* in bytes */
	__be32 value_size;		/* in bytes */
	__be32 max_entries;
	__be32 map_type;
	__be32 map_flags;		/* reserved */
};

struct cmsg_reply_map_alloc_tbl {
	struct cmsg_reply_map_simple reply_hdr;
	__be32 tid;
};

struct cmsg_req_map_free_tbl {
	struct cmsg_hdr hdr;
	__be32 tid;
};

struct cmsg_reply_map_free_tbl {
	struct cmsg_reply_map_simple reply_hdr;
	__be32 count;
};

struct cmsg_req_map_op {
	struct cmsg_hdr hdr;
	__be32 tid;
	__be32 count;
	__be32 flags;
	u8 data[0];
};

struct cmsg_reply_map_op {
	struct cmsg_reply_map_simple reply_hdr;
	__be32 count;
	__be32 resv;
	u8 data[0];
};

struct cmsg_bpf_event {
	struct cmsg_hdr hdr;
	__be32 cpu_id;
	__be64 map_ptr;
	__be32 data_size;
	__be32 pkt_size;
	u8 data[0];
};
#endif