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 
90 struct ib_reth {
91 	__be64 vaddr;        /* potentially unaligned */
92 	__be32 rkey;
93 	__be32 length;
94 } __packed;
95 
96 struct 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 
103 union 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 
122 struct ib_other_headers {
123 	__be32 bth[3];
124 	union ib_ehdrs u;
125 } __packed;
126 
127 struct 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 
ib_u64_get(__be64 * p)140 static inline u64 ib_u64_get(__be64 *p)
141 {
142 	return get_unaligned_be64(p);
143 }
144 
ib_u64_put(u64 val,__be64 * p)145 static inline void ib_u64_put(u64 val, __be64 *p)
146 {
147 	put_unaligned_be64(val, p);
148 }
149 
get_ib_reth_vaddr(struct ib_reth * reth)150 static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
151 {
152 	return ib_u64_get(&reth->vaddr);
153 }
154 
put_ib_reth_vaddr(u64 val,struct ib_reth * reth)155 static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
156 {
157 	ib_u64_put(val, &reth->vaddr);
158 }
159 
get_ib_ateth_vaddr(struct ib_atomic_eth * ateth)160 static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
161 {
162 	return ib_u64_get(&ateth->vaddr);
163 }
164 
put_ib_ateth_vaddr(u64 val,struct ib_atomic_eth * ateth)165 static inline void put_ib_ateth_vaddr(u64 val, struct ib_atomic_eth *ateth)
166 {
167 	ib_u64_put(val, &ateth->vaddr);
168 }
169 
get_ib_ateth_swap(struct ib_atomic_eth * ateth)170 static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
171 {
172 	return ib_u64_get(&ateth->swap_data);
173 }
174 
put_ib_ateth_swap(u64 val,struct ib_atomic_eth * ateth)175 static inline void put_ib_ateth_swap(u64 val, struct ib_atomic_eth *ateth)
176 {
177 	ib_u64_put(val, &ateth->swap_data);
178 }
179 
get_ib_ateth_compare(struct ib_atomic_eth * ateth)180 static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
181 {
182 	return ib_u64_get(&ateth->compare_data);
183 }
184 
put_ib_ateth_compare(u64 val,struct ib_atomic_eth * ateth)185 static 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 
ib_get_lnh(struct ib_header * hdr)203 static inline u8 ib_get_lnh(struct ib_header *hdr)
204 {
205 	return (be16_to_cpu(hdr->lrh[0]) & IB_LNH_MASK);
206 }
207 
ib_get_sc(struct ib_header * hdr)208 static 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 
ib_is_sc5(u16 sc5)213 static inline bool ib_is_sc5(u16 sc5)
214 {
215 	return !!(sc5 & IB_SC5_MASK);
216 }
217 
ib_get_sl(struct ib_header * hdr)218 static 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 
ib_get_dlid(struct ib_header * hdr)223 static inline u16 ib_get_dlid(struct ib_header *hdr)
224 {
225 	return (be16_to_cpu(hdr->lrh[1]));
226 }
227 
ib_get_slid(struct ib_header * hdr)228 static inline u16 ib_get_slid(struct ib_header *hdr)
229 {
230 	return (be16_to_cpu(hdr->lrh[3]));
231 }
232 
ib_get_lver(struct ib_header * hdr)233 static 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 
ib_get_len(struct ib_header * hdr)239 static inline u16 ib_get_len(struct ib_header *hdr)
240 {
241 	return (u16)(be16_to_cpu(hdr->lrh[2]));
242 }
243 
ib_get_qkey(struct ib_other_headers * ohdr)244 static inline u32 ib_get_qkey(struct ib_other_headers *ohdr)
245 {
246 	return be32_to_cpu(ohdr->u.ud.deth[0]);
247 }
248 
ib_get_sqpn(struct ib_other_headers * ohdr)249 static 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 
ib_bth_get_pad(struct ib_other_headers * ohdr)271 static 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 
ib_bth_get_pkey(struct ib_other_headers * ohdr)277 static 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 
ib_bth_get_opcode(struct ib_other_headers * ohdr)282 static 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 
ib_bth_get_ackreq(struct ib_other_headers * ohdr)288 static 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 
ib_bth_get_migreq(struct ib_other_headers * ohdr)294 static 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 
ib_bth_get_se(struct ib_other_headers * ohdr)300 static 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 
ib_bth_get_psn(struct ib_other_headers * ohdr)306 static inline u32 ib_bth_get_psn(struct ib_other_headers *ohdr)
307 {
308 	return (u32)(be32_to_cpu(ohdr->bth[2]));
309 }
310 
ib_bth_get_qpn(struct ib_other_headers * ohdr)311 static 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 
ib_bth_get_becn(struct ib_other_headers * ohdr)316 static 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 
ib_bth_get_fecn(struct ib_other_headers * ohdr)321 static 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 
ib_bth_get_tver(struct ib_other_headers * ohdr)326 static 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 
ib_bth_is_solicited(struct ib_other_headers * ohdr)332 static 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 
ib_bth_is_migration(struct ib_other_headers * ohdr)337 static 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 */
342