include/linux/nvme-tcp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * NVMe over Fabrics TCP protocol header.
   4  * Copyright (c) 2018 Lightbits Labs. All rights reserved.
   5  */
   6
   7 #ifndef _LINUX_NVME_TCP_H
   8 #define _LINUX_NVME_TCP_H
   9
  10 #include <linux/nvme.h>
  11
  12 #define NVME_TCP_DISC_PORT      8009
  13 #define NVME_TCP_ADMIN_CCSZ     SZ_8K
  14 #define NVME_TCP_DIGEST_LENGTH  4
  15
  16 enum nvme_tcp_pfv {
  17         NVME_TCP_PFV_1_0 = 0x0,
  18 };
  19
  20 enum nvme_tcp_fatal_error_status {
  21         NVME_TCP_FES_INVALID_PDU_HDR            = 0x01,
  22         NVME_TCP_FES_PDU_SEQ_ERR                = 0x02,
  23         NVME_TCP_FES_HDR_DIGEST_ERR             = 0x03,
  24         NVME_TCP_FES_DATA_OUT_OF_RANGE          = 0x04,
  25         NVME_TCP_FES_R2T_LIMIT_EXCEEDED         = 0x05,
  26         NVME_TCP_FES_DATA_LIMIT_EXCEEDED        = 0x05,
  27         NVME_TCP_FES_UNSUPPORTED_PARAM          = 0x06,
  28 };
  29
  30 enum nvme_tcp_digest_option {
  31         NVME_TCP_HDR_DIGEST_ENABLE      = (1 << 0),
  32         NVME_TCP_DATA_DIGEST_ENABLE     = (1 << 1),
  33 };
  34
  35 enum nvme_tcp_pdu_type {
  36         nvme_tcp_icreq          = 0x0,
  37         nvme_tcp_icresp         = 0x1,
  38         nvme_tcp_h2c_term       = 0x2,
  39         nvme_tcp_c2h_term       = 0x3,
  40         nvme_tcp_cmd            = 0x4,
  41         nvme_tcp_rsp            = 0x5,
  42         nvme_tcp_h2c_data       = 0x6,
  43         nvme_tcp_c2h_data       = 0x7,
  44         nvme_tcp_r2t            = 0x9,
  45 };
  46
  47 enum nvme_tcp_pdu_flags {
  48         NVME_TCP_F_HDGST                = (1 << 0),
  49         NVME_TCP_F_DDGST                = (1 << 1),
  50         NVME_TCP_F_DATA_LAST            = (1 << 2),
  51         NVME_TCP_F_DATA_SUCCESS         = (1 << 3),
  52 };
  53
  54 /**
  55  * struct nvme_tcp_hdr - nvme tcp pdu common header
  56  *
  57  * @type:          pdu type
  58  * @flags:         pdu specific flags
  59  * @hlen:          pdu header length
  60  * @pdo:           pdu data offset
  61  * @plen:          pdu wire byte length
  62  */
  63 struct nvme_tcp_hdr {
  64         __u8    type;
  65         __u8    flags;
  66         __u8    hlen;
  67         __u8    pdo;
  68         __le32  plen;
  69 };
  70
  71 /**
  72  * struct nvme_tcp_icreq_pdu - nvme tcp initialize connection request pdu
  73  *
  74  * @hdr:           pdu generic header
  75  * @pfv:           pdu version format
  76  * @hpda:          host pdu data alignment (dwords, 0's based)
  77  * @digest:        digest types enabled
  78  * @maxr2t:        maximum r2ts per request supported
  79  */
  80 struct nvme_tcp_icreq_pdu {
  81         struct nvme_tcp_hdr     hdr;
  82         __le16                  pfv;
  83         __u8                    hpda;
  84         __u8                    digest;
  85         __le32                  maxr2t;
  86         __u8                    rsvd2[112];
  87 };
  88
  89 /**
  90  * struct nvme_tcp_icresp_pdu - nvme tcp initialize connection response pdu
  91  *
  92  * @hdr:           pdu common header
  93  * @pfv:           pdu version format
  94  * @cpda:          controller pdu data alignment (dowrds, 0's based)
  95  * @digest:        digest types enabled
  96  * @maxdata:       maximum data capsules per r2t supported
  97  */
  98 struct nvme_tcp_icresp_pdu {
  99         struct nvme_tcp_hdr     hdr;
 100         __le16                  pfv;
 101         __u8                    cpda;
 102         __u8                    digest;
 103         __le32                  maxdata;
 104         __u8                    rsvd[112];
 105 };
 106
 107 /**
 108  * struct nvme_tcp_term_pdu - nvme tcp terminate connection pdu
 109  *
 110  * @hdr:           pdu common header
 111  * @fes:           fatal error status
 112  * @fei:           fatal error information
 113  */
 114 struct nvme_tcp_term_pdu {
 115         struct nvme_tcp_hdr     hdr;
 116         __le16                  fes;
 117         __le32                  fei;
 118         __u8                    rsvd[8];
 119 };
 120
 121 /**
 122  * struct nvme_tcp_cmd_pdu - nvme tcp command capsule pdu
 123  *
 124  * @hdr:           pdu common header
 125  * @cmd:           nvme command
 126  */
 127 struct nvme_tcp_cmd_pdu {
 128         struct nvme_tcp_hdr     hdr;
 129         struct nvme_command     cmd;
 130 };
 131
 132 /**
 133  * struct nvme_tcp_rsp_pdu - nvme tcp response capsule pdu
 134  *
 135  * @hdr:           pdu common header
 136  * @hdr:           nvme-tcp generic header
 137  * @cqe:           nvme completion queue entry
 138  */
 139 struct nvme_tcp_rsp_pdu {
 140         struct nvme_tcp_hdr     hdr;
 141         struct nvme_completion  cqe;
 142 };
 143
 144 /**
 145  * struct nvme_tcp_r2t_pdu - nvme tcp ready-to-transfer pdu
 146  *
 147  * @hdr:           pdu common header
 148  * @command_id:    nvme command identifier which this relates to
 149  * @ttag:          transfer tag (controller generated)
 150  * @r2t_offset:    offset from the start of the command data
 151  * @r2t_length:    length the host is allowed to send
 152  */
 153 struct nvme_tcp_r2t_pdu {
 154         struct nvme_tcp_hdr     hdr;
 155         __u16                   command_id;
 156         __u16                   ttag;
 157         __le32                  r2t_offset;
 158         __le32                  r2t_length;
 159         __u8                    rsvd[4];
 160 };
 161
 162 /**
 163  * struct nvme_tcp_data_pdu - nvme tcp data pdu
 164  *
 165  * @hdr:           pdu common header
 166  * @command_id:    nvme command identifier which this relates to
 167  * @ttag:          transfer tag (controller generated)
 168  * @data_offset:   offset from the start of the command data
 169  * @data_length:   length of the data stream
 170  */
 171 struct nvme_tcp_data_pdu {
 172         struct nvme_tcp_hdr     hdr;
 173         __u16                   command_id;
 174         __u16                   ttag;
 175         __le32                  data_offset;
 176         __le32                  data_length;
 177         __u8                    rsvd[4];
 178 };
 179
 180 union nvme_tcp_pdu {
 181         struct nvme_tcp_icreq_pdu       icreq;
 182         struct nvme_tcp_icresp_pdu      icresp;
 183         struct nvme_tcp_cmd_pdu         cmd;
 184         struct nvme_tcp_rsp_pdu         rsp;
 185         struct nvme_tcp_r2t_pdu         r2t;
 186         struct nvme_tcp_data_pdu        data;
 187 };
 188
 189 #endif /* _LINUX_NVME_TCP_H */