include/rdma/ib_hdrs.h

   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
 140 static inline u64 ib_u64_get(__be64 *p)
 141 {
 142         return get_unaligned_be64(p);
 143 }
 144
 145 static inline void ib_u64_put(u64 val, __be64 *p)
 146 {
 147         put_unaligned_be64(val, p);
 148 }
 149
 150 static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
 151 {
 152         return ib_u64_get(&reth->vaddr);
 153 }
 154
 155 static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
 156 {
 157         ib_u64_put(val, &reth->vaddr);
 158 }
 159
 160 static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
 161 {
 162         return ib_u64_get(&ateth->vaddr);
 163 }
 164
 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
 170 static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
 171 {
 172         return ib_u64_get(&ateth->swap_data);
 173 }
 174
 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
 180 static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
 181 {
 182         return ib_u64_get(&ateth->compare_data);
 183 }
 184
 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_SL_MASK              0xf
 197 #define IB_SL_SHIFT             4
 198
 199 static inline u8 ib_get_lnh(struct ib_header *hdr)
 200 {
 201         return (be16_to_cpu(hdr->lrh[0]) & IB_LNH_MASK);
 202 }
 203
 204 static inline u8 ib_get_sc(struct ib_header *hdr)
 205 {
 206         return ((be16_to_cpu(hdr->lrh[0]) >> IB_SC_SHIFT) & IB_SC_MASK);
 207 }
 208
 209 static inline u8 ib_get_sl(struct ib_header *hdr)
 210 {
 211         return ((be16_to_cpu(hdr->lrh[0]) >> IB_SL_SHIFT) & IB_SL_MASK);
 212 }
 213
 214 static inline u16 ib_get_dlid(struct ib_header *hdr)
 215 {
 216         return (be16_to_cpu(hdr->lrh[1]));
 217 }
 218
 219 static inline u16 ib_get_slid(struct ib_header *hdr)
 220 {
 221         return (be16_to_cpu(hdr->lrh[3]));
 222 }
 223
 224 /*
 225  * BTH
 226  */
 227 #define IB_BTH_OPCODE_MASK      0xff
 228 #define IB_BTH_OPCODE_SHIFT     24
 229 #define IB_BTH_PAD_MASK 3
 230 #define IB_BTH_PKEY_MASK        0xffff
 231 #define IB_BTH_PAD_SHIFT        20
 232
 233 static inline u8 ib_bth_get_pad(struct ib_other_headers *ohdr)
 234 {
 235         return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_PAD_SHIFT) &
 236                    IB_BTH_PAD_MASK);
 237 }
 238
 239 static inline u16 ib_bth_get_pkey(struct ib_other_headers *ohdr)
 240 {
 241         return (be32_to_cpu(ohdr->bth[0]) & IB_BTH_PKEY_MASK);
 242 }
 243
 244 static inline u8 ib_bth_get_opcode(struct ib_other_headers *ohdr)
 245 {
 246         return ((be32_to_cpu(ohdr->bth[0]) >> IB_BTH_OPCODE_SHIFT) &
 247                    IB_BTH_OPCODE_MASK);
 248 }
 249
 250 #endif                          /* IB_HDRS_H */