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Linux/include/rdma/ib_hdrs.h

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  1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
  2 /*
  3  * Copyright(c) 2016 - 2018 Intel Corporation.
  4  */
  5 
  6 #ifndef IB_HDRS_H
  7 #define IB_HDRS_H
  8 
  9 #include <linux/types.h>
 10 #include <asm/unaligned.h>
 11 #include <rdma/ib_verbs.h>
 12 
 13 #define IB_SEQ_NAK      (3 << 29)
 14 
 15 /* AETH NAK opcode values */
 16 #define IB_RNR_NAK                      0x20
 17 #define IB_NAK_PSN_ERROR                0x60
 18 #define IB_NAK_INVALID_REQUEST          0x61
 19 #define IB_NAK_REMOTE_ACCESS_ERROR      0x62
 20 #define IB_NAK_REMOTE_OPERATIONAL_ERROR 0x63
 21 #define IB_NAK_INVALID_RD_REQUEST       0x64
 22 
 23 #define IB_BTH_REQ_ACK          BIT(31)
 24 #define IB_BTH_SOLICITED        BIT(23)
 25 #define IB_BTH_MIG_REQ          BIT(22)
 26 
 27 #define IB_GRH_VERSION          6
 28 #define IB_GRH_VERSION_MASK     0xF
 29 #define IB_GRH_VERSION_SHIFT    28
 30 #define IB_GRH_TCLASS_MASK      0xFF
 31 #define IB_GRH_TCLASS_SHIFT     20
 32 #define IB_GRH_FLOW_MASK        0xFFFFF
 33 #define IB_GRH_FLOW_SHIFT       0
 34 #define IB_GRH_NEXT_HDR         0x1B
 35 #define IB_FECN_SHIFT 31
 36 #define IB_FECN_MASK 1
 37 #define IB_FECN_SMASK BIT(IB_FECN_SHIFT)
 38 #define IB_BECN_SHIFT 30
 39 #define IB_BECN_MASK 1
 40 #define IB_BECN_SMASK BIT(IB_BECN_SHIFT)
 41 
 42 #define IB_AETH_CREDIT_SHIFT    24
 43 #define IB_AETH_CREDIT_MASK     0x1F
 44 #define IB_AETH_CREDIT_INVAL    0x1F
 45 #define IB_AETH_NAK_SHIFT       29
 46 #define IB_MSN_MASK             0xFFFFFF
 47 
 48 struct ib_reth {
 49         __be64 vaddr;        /* potentially unaligned */
 50         __be32 rkey;
 51         __be32 length;
 52 } __packed;
 53 
 54 struct ib_atomic_eth {
 55         __be64 vaddr;        /* potentially unaligned */
 56         __be32 rkey;
 57         __be64 swap_data;    /* potentially unaligned */
 58         __be64 compare_data; /* potentially unaligned */
 59 } __packed;
 60 
 61 #include <rdma/tid_rdma_defs.h>
 62 
 63 union ib_ehdrs {
 64         struct {
 65                 __be32 deth[2];
 66                 __be32 imm_data;
 67         } ud;
 68         struct {
 69                 struct ib_reth reth;
 70                 __be32 imm_data;
 71         } rc;
 72         struct {
 73                 __be32 aeth;
 74                 __be64 atomic_ack_eth; /* potentially unaligned */
 75         } __packed at;
 76         __be32 imm_data;
 77         __be32 aeth;
 78         __be32 ieth;
 79         struct ib_atomic_eth atomic_eth;
 80         /* TID RDMA headers */
 81         union {
 82                 struct tid_rdma_read_req r_req;
 83                 struct tid_rdma_read_resp r_rsp;
 84                 struct tid_rdma_write_req w_req;
 85                 struct tid_rdma_write_resp w_rsp;
 86                 struct tid_rdma_write_data w_data;
 87                 struct tid_rdma_resync resync;
 88                 struct tid_rdma_ack ack;
 89         } tid_rdma;
 90 }  __packed;
 91 
 92 struct ib_other_headers {
 93         __be32 bth[3];
 94         union ib_ehdrs u;
 95 } __packed;
 96 
 97 struct ib_header {
 98         __be16 lrh[4];
 99         union {
100                 struct {
101                         struct ib_grh grh;
102                         struct ib_other_headers oth;
103                 } l;
104                 struct ib_other_headers oth;
105         } u;
106 } __packed;
107 
108 /* accessors for unaligned __be64 items */
109 
110 static inline u64 ib_u64_get(__be64 *p)
111 {
112         return get_unaligned_be64(p);
113 }
114 
115 static inline void ib_u64_put(u64 val, __be64 *p)
116 {
117         put_unaligned_be64(val, p);
118 }
119 
120 static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
121 {
122         return ib_u64_get(&reth->vaddr);
123 }
124 
125 static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
126 {
127         ib_u64_put(val, &reth->vaddr);
128 }
129 
130 static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
131 {
132         return ib_u64_get(&ateth->vaddr);
133 }
134 
135 static inline void put_ib_ateth_vaddr(u64 val, struct ib_atomic_eth *ateth)
136 {
137         ib_u64_put(val, &ateth->vaddr);
138 }
139 
140 static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
141 {
142         return ib_u64_get(&ateth->swap_data);
143 }
144 
145 static inline void put_ib_ateth_swap(u64 val, struct ib_atomic_eth *ateth)
146 {
147         ib_u64_put(val, &ateth->swap_data);
148 }
149 
150 static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
151 {
152         return ib_u64_get(&ateth->compare_data);
153 }
154 
155 static inline void put_ib_ateth_compare(u64 val, struct ib_atomic_eth *ateth)
156 {
157         ib_u64_put(val, &ateth->compare_data);
158 }
159 
160 /*
161  * 9B/IB Packet Format
162  */
163 #define IB_LNH_MASK             3
164 #define IB_SC_MASK              0xf
165 #define IB_SC_SHIFT             12
166 #define IB_SC5_MASK             0x10
167 #define IB_SL_MASK              0xf
168 #define IB_SL_SHIFT             4
169 #define IB_SL_SHIFT             4
170 #define IB_LVER_MASK    0xf
171 #define IB_LVER_SHIFT   8
172 
173 static inline u8 ib_get_lnh(struct ib_header *hdr)
174 {
175         return (be16_to_cpu(hdr->lrh[0]) & IB_LNH_MASK);
176 }
177 
178 static inline u8 ib_get_sc(struct ib_header *hdr)
179 {
180         return ((be16_to_cpu(hdr->lrh[0]) >> IB_SC_SHIFT) & IB_SC_MASK);
181 }
182 
183 static inline bool ib_is_sc5(u16 sc5)
184 {
185         return !!(sc5 & IB_SC5_MASK);
186 }
187 
188 static inline u8 ib_get_sl(struct ib_header *hdr)
189 {
190         return ((be16_to_cpu(hdr->lrh[0]) >> IB_SL_SHIFT) & IB_SL_MASK);
191 }
192 
193 static inline u16 ib_get_dlid(struct ib_header *hdr)
194 {
195         return (be16_to_cpu(hdr->lrh[1]));
196 }
197 
198 static inline u16 ib_get_slid(struct ib_header *hdr)
199 {
200         return (be16_to_cpu(hdr->lrh[3]));
201 }
202 
203 static inline u8 ib_get_lver(struct ib_header *hdr)
204 {
205         return (u8)((be16_to_cpu(hdr->lrh[0]) >> IB_LVER_SHIFT) &
206                    IB_LVER_MASK);
207 }
208 
209 static inline u32 ib_get_qkey(struct ib_other_headers *ohdr)
210 {
211         return be32_to_cpu(ohdr->u.ud.deth[0]);
212 }
213 
214 static inline u32 ib_get_sqpn(struct ib_other_headers *ohdr)
215 {
216         return ((be32_to_cpu(ohdr->u.ud.deth[1])) & IB_QPN_MASK);
217 }
218 
219 /*
220  * BTH
221  */
222 #define IB_BTH_OPCODE_MASK      0xff
223 #define IB_BTH_OPCODE_SHIFT     24
224 #define IB_BTH_PAD_MASK 3
225 #define IB_BTH_PKEY_MASK        0xffff
226 #define IB_BTH_PAD_SHIFT        20
227 #define IB_BTH_A_MASK           1
228 #define IB_BTH_A_SHIFT          31
229 #define IB_BTH_M_MASK           1
230 #define IB_BTH_M_SHIFT          22
231 #define IB_BTH_SE_MASK          1
232 #define IB_BTH_SE_SHIFT 23
233 #define IB_BTH_TVER_MASK        0xf
234 #define IB_BTH_TVER_SHIFT       16
235 
236 static inline u8 ib_bth_get_pad(struct ib_other_headers *ohdr)
237 {
238         return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_PAD_SHIFT) &
239                    IB_BTH_PAD_MASK);
240 }
241 
242 static inline u16 ib_bth_get_pkey(struct ib_other_headers *ohdr)
243 {
244         return (be32_to_cpu(ohdr->bth[0]) & IB_BTH_PKEY_MASK);
245 }
246 
247 static inline u8 ib_bth_get_opcode(struct ib_other_headers *ohdr)
248 {
249         return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_OPCODE_SHIFT) &
250                    IB_BTH_OPCODE_MASK);
251 }
252 
253 static inline u8 ib_bth_get_ackreq(struct ib_other_headers *ohdr)
254 {
255         return (u8)((be32_to_cpu(ohdr->bth[2]) >> IB_BTH_A_SHIFT) &
256                    IB_BTH_A_MASK);
257 }
258 
259 static inline u8 ib_bth_get_migreq(struct ib_other_headers *ohdr)
260 {
261         return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_M_SHIFT) &
262                     IB_BTH_M_MASK);
263 }
264 
265 static inline u8 ib_bth_get_se(struct ib_other_headers *ohdr)
266 {
267         return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_SE_SHIFT) &
268                     IB_BTH_SE_MASK);
269 }
270 
271 static inline u32 ib_bth_get_psn(struct ib_other_headers *ohdr)
272 {
273         return (u32)(be32_to_cpu(ohdr->bth[2]));
274 }
275 
276 static inline u32 ib_bth_get_qpn(struct ib_other_headers *ohdr)
277 {
278         return (u32)((be32_to_cpu(ohdr->bth[1])) & IB_QPN_MASK);
279 }
280 
281 static inline bool ib_bth_get_becn(struct ib_other_headers *ohdr)
282 {
283         return (ohdr->bth[1]) & cpu_to_be32(IB_BECN_SMASK);
284 }
285 
286 static inline bool ib_bth_get_fecn(struct ib_other_headers *ohdr)
287 {
288         return (ohdr->bth[1]) & cpu_to_be32(IB_FECN_SMASK);
289 }
290 
291 static inline u8 ib_bth_get_tver(struct ib_other_headers *ohdr)
292 {
293         return (u8)((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_TVER_SHIFT)  &
294                     IB_BTH_TVER_MASK);
295 }
296 
297 static inline bool ib_bth_is_solicited(struct ib_other_headers *ohdr)
298 {
299         return ohdr->bth[0] & cpu_to_be32(IB_BTH_SOLICITED);
300 }
301 
302 static inline bool ib_bth_is_migration(struct ib_other_headers *ohdr)
303 {
304         return ohdr->bth[0] & cpu_to_be32(IB_BTH_MIG_REQ);
305 }
306 #endif                          /* IB_HDRS_H */
307 

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