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
  78 #define IB_AETH_CREDIT_SHIFT    24
  79 #define IB_AETH_CREDIT_MASK     0x1F
  80 #define IB_AETH_CREDIT_INVAL    0x1F
  81 #define IB_AETH_NAK_SHIFT       29
  82 #define IB_MSN_MASK             0xFFFFFF
  83
  84 struct ib_reth {
  85         __be64 vaddr;        /* potentially unaligned */
  86         __be32 rkey;
  87         __be32 length;
  88 } __packed;
  89
  90 struct ib_atomic_eth {
  91         __be64 vaddr;        /* potentially unaligned */
  92         __be32 rkey;
  93         __be64 swap_data;    /* potentially unaligned */
  94         __be64 compare_data; /* potentially unaligned */
  95 } __packed;
  96
  97 union ib_ehdrs {
  98         struct {
  99                 __be32 deth[2];
 100                 __be32 imm_data;
 101         } ud;
 102         struct {
 103                 struct ib_reth reth;
 104                 __be32 imm_data;
 105         } rc;
 106         struct {
 107                 __be32 aeth;
 108                 __be64 atomic_ack_eth; /* potentially unaligned */
 109         } __packed at;
 110         __be32 imm_data;
 111         __be32 aeth;
 112         __be32 ieth;
 113         struct ib_atomic_eth atomic_eth;
 114 }  __packed;
 115
 116 struct ib_other_headers {
 117         __be32 bth[3];
 118         union ib_ehdrs u;
 119 } __packed;
 120
 121 struct ib_header {
 122         __be16 lrh[4];
 123         union {
 124                 struct {
 125                         struct ib_grh grh;
 126                         struct ib_other_headers oth;
 127                 } l;
 128                 struct ib_other_headers oth;
 129         } u;
 130 } __packed;
 131
 132 /* accessors for unaligned __be64 items */
 133
 134 static inline u64 ib_u64_get(__be64 *p)
 135 {
 136         return get_unaligned_be64(p);
 137 }
 138
 139 static inline void ib_u64_put(u64 val, __be64 *p)
 140 {
 141         put_unaligned_be64(val, p);
 142 }
 143
 144 static inline u64 get_ib_reth_vaddr(struct ib_reth *reth)
 145 {
 146         return ib_u64_get(&reth->vaddr);
 147 }
 148
 149 static inline void put_ib_reth_vaddr(u64 val, struct ib_reth *reth)
 150 {
 151         ib_u64_put(val, &reth->vaddr);
 152 }
 153
 154 static inline u64 get_ib_ateth_vaddr(struct ib_atomic_eth *ateth)
 155 {
 156         return ib_u64_get(&ateth->vaddr);
 157 }
 158
 159 static inline void put_ib_ateth_vaddr(u64 val, struct ib_atomic_eth *ateth)
 160 {
 161         ib_u64_put(val, &ateth->vaddr);
 162 }
 163
 164 static inline u64 get_ib_ateth_swap(struct ib_atomic_eth *ateth)
 165 {
 166         return ib_u64_get(&ateth->swap_data);
 167 }
 168
 169 static inline void put_ib_ateth_swap(u64 val, struct ib_atomic_eth *ateth)
 170 {
 171         ib_u64_put(val, &ateth->swap_data);
 172 }
 173
 174 static inline u64 get_ib_ateth_compare(struct ib_atomic_eth *ateth)
 175 {
 176         return ib_u64_get(&ateth->compare_data);
 177 }
 178
 179 static inline void put_ib_ateth_compare(u64 val, struct ib_atomic_eth *ateth)
 180 {
 181         ib_u64_put(val, &ateth->compare_data);
 182 }
 183
 184 #endif                          /* IB_HDRS_H */