1/*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright(c) 2016 Intel Corporation.
5 *
6 * This file is provided under a dual BSD/GPLv2 license.  When using or
7 * redistributing this file, you may do so under either license.
8 *
9 * GPL LICENSE SUMMARY
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of version 2 of the GNU General Public License as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * BSD LICENSE
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 *
26 *  - Redistributions of source code must retain the above copyright
27 *    notice, this list of conditions and the following disclaimer.
28 *  - Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in
30 *    the documentation and/or other materials provided with the
31 *    distribution.
32 *  - Neither the name of Intel Corporation nor the names of its
33 *    contributors may be used to endorse or promote products derived
34 *    from this software without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
37 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
38 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
39 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
40 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
43 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
44 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
45 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
46 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 */
48
49#ifndef IB_HDRS_H
50#define IB_HDRS_H
51
52#include <linux/types.h>
53#include <asm/unaligned.h>
54#include <rdma/ib_verbs.h>
55
56#define IB_SEQ_NAK	(3 << 29)
57
58/* AETH NAK opcode values */
59#define IB_RNR_NAK                      0x20
60#define IB_NAK_PSN_ERROR                0x60
61#define IB_NAK_INVALID_REQUEST          0x61
62#define IB_NAK_REMOTE_ACCESS_ERROR      0x62
63#define IB_NAK_REMOTE_OPERATIONAL_ERROR 0x63
64#define IB_NAK_INVALID_RD_REQUEST       0x64
65
66#define IB_BTH_REQ_ACK		BIT(31)
67#define IB_BTH_SOLICITED	BIT(23)
68#define IB_BTH_MIG_REQ		BIT(22)
69
70#define IB_GRH_VERSION		6
71#define IB_GRH_VERSION_MASK	0xF
72#define IB_GRH_VERSION_SHIFT	28
73#define IB_GRH_TCLASS_MASK	0xFF
74#define IB_GRH_TCLASS_SHIFT	20
75#define IB_GRH_FLOW_MASK	0xFFFFF
76#define IB_GRH_FLOW_SHIFT	0
77#define IB_GRH_NEXT_HDR		0x1B
78
79struct ib_reth {
80	__be64 vaddr;        /* potentially unaligned */
81	__be32 rkey;
82	__be32 length;
83} __packed;
84
85struct ib_atomic_eth {
86	__be64 vaddr;        /* potentially unaligned */
87	__be32 rkey;
88	__be64 swap_data;    /* potentially unaligned */
89	__be64 compare_data; /* potentially unaligned */
90} __packed;
91
92union ib_ehdrs {
93	struct {
94		__be32 deth[2];
95		__be32 imm_data;
96	} ud;
97	struct {
98		struct ib_reth reth;
99		__be32 imm_data;
100	} rc;
101	struct {
102		__be32 aeth;
103		__be64 atomic_ack_eth; /* potentially unaligned */
104	} __packed at;
105	__be32 imm_data;
106	__be32 aeth;
107	__be32 ieth;
108	struct ib_atomic_eth atomic_eth;
109}  __packed;
110
111struct ib_other_headers {
112	__be32 bth[3];
113	union ib_ehdrs u;
114} __packed;
115
116struct ib_header {
117	__be16 lrh[4];
118	union {
119		struct {
120			struct ib_grh grh;
121			struct ib_other_headers oth;
122		} l;
123		struct ib_other_headers oth;
124	} u;
125} __packed;
126
127/* accessors for unaligned __be64 items */
128
129static inline u64 ib_u64_get(__be64 *p)
130{
131	return get_unaligned_be64(p);
132}
133
134static inline void ib_u64_put(u64 val, __be64 *p)
135{
136	put_unaligned_be64(val, p);
137}
138
139static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
140{
141	return ib_u64_get(&reth->vaddr);
142}
143
144static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
145{
146	ib_u64_put(val, &reth->vaddr);
147}
148
149static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
150{
151	return ib_u64_get(&ateth->vaddr);
152}
153
154static inline void put_ib_ateth_vaddr(u64 val, struct ib_atomic_eth *ateth)
155{
156	ib_u64_put(val, &ateth->vaddr);
157}
158
159static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
160{
161	return ib_u64_get(&ateth->swap_data);
162}
163
164static inline void put_ib_ateth_swap(u64 val, struct ib_atomic_eth *ateth)
165{
166	ib_u64_put(val, &ateth->swap_data);
167}
168
169static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
170{
171	return ib_u64_get(&ateth->compare_data);
172}
173
174static inline void put_ib_ateth_compare(u64 val, struct ib_atomic_eth *ateth)
175{
176	ib_u64_put(val, &ateth->compare_data);
177}
178
179#endif                          /* IB_HDRS_H */
180