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