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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#define IB_FECN_SHIFT 31
78#define IB_FECN_MASK 1
79#define IB_FECN_SMASK BIT(IB_FECN_SHIFT)
80#define IB_BECN_SHIFT 30
81#define IB_BECN_MASK 1
82#define IB_BECN_SMASK BIT(IB_BECN_SHIFT)
83
84#define IB_AETH_CREDIT_SHIFT 24
85#define IB_AETH_CREDIT_MASK 0x1F
86#define IB_AETH_CREDIT_INVAL 0x1F
87#define IB_AETH_NAK_SHIFT 29
88#define IB_MSN_MASK 0xFFFFFF
89
90struct ib_reth {
91 __be64 vaddr; /* potentially unaligned */
92 __be32 rkey;
93 __be32 length;
94} __packed;
95
96struct ib_atomic_eth {
97 __be64 vaddr; /* potentially unaligned */
98 __be32 rkey;
99 __be64 swap_data; /* potentially unaligned */
100 __be64 compare_data; /* potentially unaligned */
101} __packed;
102
103union ib_ehdrs {
104 struct {
105 __be32 deth[2];
106 __be32 imm_data;
107 } ud;
108 struct {
109 struct ib_reth reth;
110 __be32 imm_data;
111 } rc;
112 struct {
113 __be32 aeth;
114 __be64 atomic_ack_eth; /* potentially unaligned */
115 } __packed at;
116 __be32 imm_data;
117 __be32 aeth;
118 __be32 ieth;
119 struct ib_atomic_eth atomic_eth;
120} __packed;
121
122struct ib_other_headers {
123 __be32 bth[3];
124 union ib_ehdrs u;
125} __packed;
126
127struct ib_header {
128 __be16 lrh[4];
129 union {
130 struct {
131 struct ib_grh grh;
132 struct ib_other_headers oth;
133 } l;
134 struct ib_other_headers oth;
135 } u;
136} __packed;
137
138/* accessors for unaligned __be64 items */
139
140static inline u64 ib_u64_get(__be64 *p)
141{
142 return get_unaligned_be64(p);
143}
144
145static inline void ib_u64_put(u64 val, __be64 *p)
146{
147 put_unaligned_be64(val, p);
148}
149
150static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
151{
152 return ib_u64_get(&reth->vaddr);
153}
154
155static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
156{
157 ib_u64_put(val, &reth->vaddr);
158}
159
160static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
161{
162 return ib_u64_get(&ateth->vaddr);
163}
164
165static inline void put_ib_ateth_vaddr(u64 val, struct ib_atomic_eth *ateth)
166{
167 ib_u64_put(val, &ateth->vaddr);
168}
169
170static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
171{
172 return ib_u64_get(&ateth->swap_data);
173}
174
175static inline void put_ib_ateth_swap(u64 val, struct ib_atomic_eth *ateth)
176{
177 ib_u64_put(val, &ateth->swap_data);
178}
179
180static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
181{
182 return ib_u64_get(&ateth->compare_data);
183}
184
185static inline void put_ib_ateth_compare(u64 val, struct ib_atomic_eth *ateth)
186{
187 ib_u64_put(val, &ateth->compare_data);
188}
189
190/*
191 * 9B/IB Packet Format
192 */
193#define IB_LNH_MASK 3
194#define IB_SC_MASK 0xf
195#define IB_SC_SHIFT 12
196#define IB_SC5_MASK 0x10
197#define IB_SL_MASK 0xf
198#define IB_SL_SHIFT 4
199#define IB_SL_SHIFT 4
200#define IB_LVER_MASK 0xf
201#define IB_LVER_SHIFT 8
202
203static inline u8 ib_get_lnh(struct ib_header *hdr)
204{
205 return (be16_to_cpu(hdr->lrh[0]) & IB_LNH_MASK);
206}
207
208static inline u8 ib_get_sc(struct ib_header *hdr)
209{
210 return ((be16_to_cpu(hdr->lrh[0]) >> IB_SC_SHIFT) & IB_SC_MASK);
211}
212
213static inline bool ib_is_sc5(u16 sc5)
214{
215 return !!(sc5 & IB_SC5_MASK);
216}
217
218static inline u8 ib_get_sl(struct ib_header *hdr)
219{
220 return ((be16_to_cpu(hdr->lrh[0]) >> IB_SL_SHIFT) & IB_SL_MASK);
221}
222
223static inline u16 ib_get_dlid(struct ib_header *hdr)
224{
225 return (be16_to_cpu(hdr->lrh[1]));
226}
227
228static inline u16 ib_get_slid(struct ib_header *hdr)
229{
230 return (be16_to_cpu(hdr->lrh[3]));
231}
232
233static inline u8 ib_get_lver(struct ib_header *hdr)
234{
235 return (u8)((be16_to_cpu(hdr->lrh[0]) >> IB_LVER_SHIFT) &
236 IB_LVER_MASK);
237}
238
239static inline u16 ib_get_len(struct ib_header *hdr)
240{
241 return (u16)(be16_to_cpu(hdr->lrh[2]));
242}
243
244static inline u32 ib_get_qkey(struct ib_other_headers *ohdr)
245{
246 return be32_to_cpu(ohdr->u.ud.deth[0]);
247}
248
249static inline u32 ib_get_sqpn(struct ib_other_headers *ohdr)
250{
251 return ((be32_to_cpu(ohdr->u.ud.deth[1])) & IB_QPN_MASK);
252}
253
254/*
255 * BTH
256 */
257#define IB_BTH_OPCODE_MASK 0xff
258#define IB_BTH_OPCODE_SHIFT 24
259#define IB_BTH_PAD_MASK 3
260#define IB_BTH_PKEY_MASK 0xffff
261#define IB_BTH_PAD_SHIFT 20
262#define IB_BTH_A_MASK 1
263#define IB_BTH_A_SHIFT 31
264#define IB_BTH_M_MASK 1
265#define IB_BTH_M_SHIFT 22
266#define IB_BTH_SE_MASK 1
267#define IB_BTH_SE_SHIFT 23
268#define IB_BTH_TVER_MASK 0xf
269#define IB_BTH_TVER_SHIFT 16
270
271static inline u8 ib_bth_get_pad(struct ib_other_headers *ohdr)
272{
273 return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_PAD_SHIFT) &
274 IB_BTH_PAD_MASK);
275}
276
277static inline u16 ib_bth_get_pkey(struct ib_other_headers *ohdr)
278{
279 return (be32_to_cpu(ohdr->bth[0]) & IB_BTH_PKEY_MASK);
280}
281
282static inline u8 ib_bth_get_opcode(struct ib_other_headers *ohdr)
283{
284 return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_OPCODE_SHIFT) &
285 IB_BTH_OPCODE_MASK);
286}
287
288static inline u8 ib_bth_get_ackreq(struct ib_other_headers *ohdr)
289{
290 return (u8)((be32_to_cpu(ohdr->bth[2]) >> IB_BTH_A_SHIFT) &
291 IB_BTH_A_MASK);
292}
293
294static inline u8 ib_bth_get_migreq(struct ib_other_headers *ohdr)
295{
296 return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_M_SHIFT) &
297 IB_BTH_M_MASK);
298}
299
300static inline u8 ib_bth_get_se(struct ib_other_headers *ohdr)
301{
302 return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_SE_SHIFT) &
303 IB_BTH_SE_MASK);
304}
305
306static inline u32 ib_bth_get_psn(struct ib_other_headers *ohdr)
307{
308 return (u32)(be32_to_cpu(ohdr->bth[2]));
309}
310
311static inline u32 ib_bth_get_qpn(struct ib_other_headers *ohdr)
312{
313 return (u32)((be32_to_cpu(ohdr->bth[1])) & IB_QPN_MASK);
314}
315
316static inline bool ib_bth_get_becn(struct ib_other_headers *ohdr)
317{
318 return (ohdr->bth[1]) & cpu_to_be32(IB_BECN_SMASK);
319}
320
321static inline bool ib_bth_get_fecn(struct ib_other_headers *ohdr)
322{
323 return (ohdr->bth[1]) & cpu_to_be32(IB_FECN_SMASK);
324}
325
326static inline u8 ib_bth_get_tver(struct ib_other_headers *ohdr)
327{
328 return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_TVER_SHIFT) &
329 IB_BTH_TVER_MASK);
330}
331
332static inline bool ib_bth_is_solicited(struct ib_other_headers *ohdr)
333{
334 return ohdr->bth[0] & cpu_to_be32(IB_BTH_SOLICITED);
335}
336
337static inline bool ib_bth_is_migration(struct ib_other_headers *ohdr)
338{
339 return ohdr->bth[0] & cpu_to_be32(IB_BTH_MIG_REQ);
340}
341#endif /* IB_HDRS_H */