net/smc/smc_clc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  CLC (connection layer control) handshake over initial TCP socket to
   6  *  prepare for RDMA traffic
   7  *
   8  *  Copyright IBM Corp. 2016
   9  *
  10  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  11  */
  12
  13 #ifndef _SMC_CLC_H
  14 #define _SMC_CLC_H
  15
  16 #include <rdma/ib_verbs.h>
  17
  18 #include "smc.h"
  19
  20 #define SMC_CLC_PROPOSAL        0x01
  21 #define SMC_CLC_ACCEPT          0x02
  22 #define SMC_CLC_CONFIRM         0x03
  23 #define SMC_CLC_DECLINE         0x04
  24
  25 #define SMC_TYPE_R              0               /* SMC-R only                 */
  26 #define SMC_TYPE_D              1               /* SMC-D only                 */
  27 #define SMC_TYPE_N              2               /* neither SMC-R nor SMC-D    */
  28 #define SMC_TYPE_B              3               /* SMC-R and SMC-D            */
  29 #define CLC_WAIT_TIME           (6 * HZ)        /* max. wait time on clcsock  */
  30 #define CLC_WAIT_TIME_SHORT     HZ              /* short wait time on clcsock */
  31 #define SMC_CLC_DECL_MEM        0x01010000  /* insufficient memory resources  */
  32 #define SMC_CLC_DECL_TIMEOUT_CL 0x02010000  /* timeout w4 QP confirm link     */
  33 #define SMC_CLC_DECL_TIMEOUT_AL 0x02020000  /* timeout w4 QP add link         */
  34 #define SMC_CLC_DECL_CNFERR     0x03000000  /* configuration error            */
  35 #define SMC_CLC_DECL_PEERNOSMC  0x03010000  /* peer did not indicate SMC      */
  36 #define SMC_CLC_DECL_IPSEC      0x03020000  /* IPsec usage                    */
  37 #define SMC_CLC_DECL_NOSMCDEV   0x03030000  /* no SMC device found (R or D)   */
  38 #define SMC_CLC_DECL_NOSMCDDEV  0x03030001  /* no SMC-D device found          */
  39 #define SMC_CLC_DECL_NOSMCRDEV  0x03030002  /* no SMC-R device found          */
  40 #define SMC_CLC_DECL_NOISM2SUPP 0x03030003  /* hardware has no ISMv2 support  */
  41 #define SMC_CLC_DECL_NOV2EXT    0x03030004  /* peer sent no clc v2 extension  */
  42 #define SMC_CLC_DECL_NOV2DEXT   0x03030005  /* peer sent no clc SMC-Dv2 ext.  */
  43 #define SMC_CLC_DECL_NOSEID     0x03030006  /* peer sent no SEID              */
  44 #define SMC_CLC_DECL_NOSMCD2DEV 0x03030007  /* no SMC-Dv2 device found        */
  45 #define SMC_CLC_DECL_MODEUNSUPP 0x03040000  /* smc modes do not match (R or D)*/
  46 #define SMC_CLC_DECL_RMBE_EC    0x03050000  /* peer has eyecatcher in RMBE    */
  47 #define SMC_CLC_DECL_OPTUNSUPP  0x03060000  /* fastopen sockopt not supported */
  48 #define SMC_CLC_DECL_DIFFPREFIX 0x03070000  /* IP prefix / subnet mismatch    */
  49 #define SMC_CLC_DECL_GETVLANERR 0x03080000  /* err to get vlan id of ip device*/
  50 #define SMC_CLC_DECL_ISMVLANERR 0x03090000  /* err to reg vlan id on ism dev  */
  51 #define SMC_CLC_DECL_NOACTLINK  0x030a0000  /* no active smc-r link in lgr    */
  52 #define SMC_CLC_DECL_NOSRVLINK  0x030b0000  /* SMC-R link from srv not found  */
  53 #define SMC_CLC_DECL_VERSMISMAT 0x030c0000  /* SMC version mismatch           */
  54 #define SMC_CLC_DECL_MAX_DMB    0x030d0000  /* SMC-D DMB limit exceeded       */
  55 #define SMC_CLC_DECL_SYNCERR    0x04000000  /* synchronization error          */
  56 #define SMC_CLC_DECL_PEERDECL   0x05000000  /* peer declined during handshake */
  57 #define SMC_CLC_DECL_INTERR     0x09990000  /* internal error                 */
  58 #define SMC_CLC_DECL_ERR_RTOK   0x09990001  /*   rtoken handling failed       */
  59 #define SMC_CLC_DECL_ERR_RDYLNK 0x09990002  /*   ib ready link failed         */
  60 #define SMC_CLC_DECL_ERR_REGRMB 0x09990003  /*   reg rmb failed               */
  61
  62 #define SMC_FIRST_CONTACT_MASK  0b10    /* first contact bit within typev2 */
  63
  64 struct smc_clc_msg_hdr {        /* header1 of clc messages */
  65         u8 eyecatcher[4];       /* eye catcher */
  66         u8 type;                /* proposal / accept / confirm / decline */
  67         __be16 length;
  68 #if defined(__BIG_ENDIAN_BITFIELD)
  69         u8 version : 4,
  70            typev2  : 2,
  71            typev1  : 2;
  72 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  73         u8 typev1  : 2,
  74            typev2  : 2,
  75            version : 4;
  76 #endif
  77 } __packed;                     /* format defined in RFC7609 */
  78
  79 struct smc_clc_msg_trail {      /* trailer of clc messages */
  80         u8 eyecatcher[4];
  81 };
  82
  83 struct smc_clc_msg_local {      /* header2 of clc messages */
  84         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
  85         u8 gid[16];             /* gid of ib_device port */
  86         u8 mac[6];              /* mac of ib_device port */
  87 };
  88
  89 /* Struct would be 4 byte aligned, but it is used in an array that is sent
  90  * to peers and must conform to RFC7609, hence we need to use packed here.
  91  */
  92 struct smc_clc_ipv6_prefix {
  93         struct in6_addr prefix;
  94         u8 prefix_len;
  95 } __packed;                     /* format defined in RFC7609 */
  96
  97 #if defined(__BIG_ENDIAN_BITFIELD)
  98 struct smc_clc_v2_flag {
  99         u8 release : 4,
 100            rsvd    : 3,
 101            seid    : 1;
 102 };
 103 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 104 struct smc_clc_v2_flag {
 105         u8 seid   : 1,
 106         rsvd      : 3,
 107         release   : 4;
 108 };
 109 #endif
 110
 111 struct smc_clnt_opts_area_hdr {
 112         u8 eid_cnt;             /* number of user defined EIDs */
 113         u8 ism_gid_cnt;         /* number of ISMv2 GIDs */
 114         u8 reserved1;
 115         struct smc_clc_v2_flag flag;
 116         u8 reserved2[2];
 117         __be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
 118 };
 119
 120 struct smc_clc_smcd_gid_chid {
 121         __be64 gid;             /* ISM GID */
 122         __be16 chid;            /* ISMv2 CHID */
 123 } __packed;             /* format defined in
 124                          * IBM Shared Memory Communications Version 2
 125                          * (https://www.ibm.com/support/pages/node/6326337)
 126                          */
 127
 128 struct smc_clc_v2_extension {
 129         struct smc_clnt_opts_area_hdr hdr;
 130         u8 roce[16];            /* RoCEv2 GID */
 131         u8 reserved[16];
 132         u8 user_eids[][SMC_MAX_EID_LEN];
 133 };
 134
 135 struct smc_clc_msg_proposal_prefix {    /* prefix part of clc proposal message*/
 136         __be32 outgoing_subnet; /* subnet mask */
 137         u8 prefix_len;          /* number of significant bits in mask */
 138         u8 reserved[2];
 139         u8 ipv6_prefixes_cnt;   /* number of IPv6 prefixes in prefix array */
 140 } __aligned(4);
 141
 142 struct smc_clc_msg_smcd {       /* SMC-D GID information */
 143         struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */
 144         __be16 v2_ext_offset;   /* SMC Version 2 Extension Offset */
 145         u8 reserved[28];
 146 };
 147
 148 struct smc_clc_smcd_v2_extension {
 149         u8 system_eid[SMC_MAX_EID_LEN];
 150         u8 reserved[16];
 151         struct smc_clc_smcd_gid_chid gidchid[];
 152 };
 153
 154 struct smc_clc_msg_proposal {   /* clc proposal message sent by Linux */
 155         struct smc_clc_msg_hdr hdr;
 156         struct smc_clc_msg_local lcl;
 157         __be16 iparea_offset;   /* offset to IP address information area */
 158 } __aligned(4);
 159
 160 #define SMC_CLC_MAX_V6_PREFIX           8
 161
 162 struct smc_clc_msg_proposal_area {
 163         struct smc_clc_msg_proposal             pclc_base;
 164         struct smc_clc_msg_smcd                 pclc_smcd;
 165         struct smc_clc_msg_proposal_prefix      pclc_prfx;
 166         struct smc_clc_ipv6_prefix      pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
 167         struct smc_clc_v2_extension             pclc_v2_ext;
 168         struct smc_clc_smcd_v2_extension        pclc_smcd_v2_ext;
 169         struct smc_clc_smcd_gid_chid            pclc_gidchids[SMC_MAX_ISM_DEVS];
 170         struct smc_clc_msg_trail                pclc_trl;
 171 };
 172
 173 struct smcr_clc_msg_accept_confirm {    /* SMCR accept/confirm */
 174         struct smc_clc_msg_local lcl;
 175         u8 qpn[3];                      /* QP number */
 176         __be32 rmb_rkey;                /* RMB rkey */
 177         u8 rmbe_idx;                    /* Index of RMBE in RMB */
 178         __be32 rmbe_alert_token;        /* unique connection id */
 179  #if defined(__BIG_ENDIAN_BITFIELD)
 180         u8 rmbe_size : 4,               /* buf size (compressed) */
 181            qp_mtu   : 4;                /* QP mtu */
 182 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 183         u8 qp_mtu   : 4,
 184            rmbe_size : 4;
 185 #endif
 186         u8 reserved;
 187         __be64 rmb_dma_addr;    /* RMB virtual address */
 188         u8 reserved2;
 189         u8 psn[3];              /* packet sequence number */
 190 } __packed;
 191
 192 struct smcd_clc_msg_accept_confirm_common {     /* SMCD accept/confirm */
 193         u64 gid;                /* Sender GID */
 194         u64 token;              /* DMB token */
 195         u8 dmbe_idx;            /* DMBE index */
 196 #if defined(__BIG_ENDIAN_BITFIELD)
 197         u8 dmbe_size : 4,       /* buf size (compressed) */
 198            reserved3 : 4;
 199 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 200         u8 reserved3 : 4,
 201            dmbe_size : 4;
 202 #endif
 203         u16 reserved4;
 204         __be32 linkid;          /* Link identifier */
 205 } __packed;
 206
 207 #define SMC_CLC_OS_ZOS          1
 208 #define SMC_CLC_OS_LINUX        2
 209 #define SMC_CLC_OS_AIX          3
 210
 211 struct smc_clc_first_contact_ext {
 212         u8 reserved1;
 213 #if defined(__BIG_ENDIAN_BITFIELD)
 214         u8 os_type : 4,
 215            release : 4;
 216 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 217         u8 release : 4,
 218            os_type : 4;
 219 #endif
 220         u8 reserved2[2];
 221         u8 hostname[SMC_MAX_HOSTNAME_LEN];
 222 };
 223
 224 struct smc_clc_msg_accept_confirm {     /* clc accept / confirm message */
 225         struct smc_clc_msg_hdr hdr;
 226         union {
 227                 struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
 228                 struct { /* SMC-D */
 229                         struct smcd_clc_msg_accept_confirm_common d0;
 230                         u32 reserved5[3];
 231                 };
 232         };
 233 } __packed;                     /* format defined in RFC7609 */
 234
 235 struct smc_clc_msg_accept_confirm_v2 {  /* clc accept / confirm message */
 236         struct smc_clc_msg_hdr hdr;
 237         union {
 238                 struct smcr_clc_msg_accept_confirm r0; /* SMC-R */
 239                 struct { /* SMC-D */
 240                         struct smcd_clc_msg_accept_confirm_common d0;
 241                         __be16 chid;
 242                         u8 eid[SMC_MAX_EID_LEN];
 243                         u8 reserved5[8];
 244                 };
 245         };
 246 };
 247
 248 struct smc_clc_msg_decline {    /* clc decline message */
 249         struct smc_clc_msg_hdr hdr;
 250         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 251         __be32 peer_diagnosis;  /* diagnosis information */
 252 #if defined(__BIG_ENDIAN_BITFIELD)
 253         u8 os_type  : 4,
 254            reserved : 4;
 255 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 256         u8 reserved : 4,
 257            os_type  : 4;
 258 #endif
 259         u8 reserved2[3];
 260         struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
 261 } __aligned(4);
 262
 263 /* determine start of the prefix area within the proposal message */
 264 static inline struct smc_clc_msg_proposal_prefix *
 265 smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
 266 {
 267         return (struct smc_clc_msg_proposal_prefix *)
 268                ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
 269 }
 270
 271 static inline bool smcr_indicated(int smc_type)
 272 {
 273         return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
 274 }
 275
 276 static inline bool smcd_indicated(int smc_type)
 277 {
 278         return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
 279 }
 280
 281 /* get SMC-D info from proposal message */
 282 static inline struct smc_clc_msg_smcd *
 283 smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
 284 {
 285         if (smcd_indicated(prop->hdr.typev1) &&
 286             ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
 287                 return NULL;
 288
 289         return (struct smc_clc_msg_smcd *)(prop + 1);
 290 }
 291
 292 static inline struct smc_clc_v2_extension *
 293 smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
 294 {
 295         struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);
 296
 297         if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
 298                 return NULL;
 299
 300         return (struct smc_clc_v2_extension *)
 301                ((u8 *)prop_smcd +
 302                offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
 303                sizeof(prop_smcd->v2_ext_offset) +
 304                ntohs(prop_smcd->v2_ext_offset));
 305 }
 306
 307 static inline struct smc_clc_smcd_v2_extension *
 308 smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
 309 {
 310         if (!prop_v2ext)
 311                 return NULL;
 312         if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
 313                 return NULL;
 314
 315         return (struct smc_clc_smcd_v2_extension *)
 316                 ((u8 *)prop_v2ext +
 317                  offsetof(struct smc_clc_v2_extension, hdr) +
 318                  offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
 319                  sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
 320                  ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
 321 }
 322
 323 struct smcd_dev;
 324 struct smc_init_info;
 325
 326 int smc_clc_prfx_match(struct socket *clcsock,
 327                        struct smc_clc_msg_proposal_prefix *prop);
 328 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 329                      u8 expected_type, unsigned long timeout);
 330 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
 331 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
 332 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
 333                          u8 version);
 334 int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
 335                         u8 version);
 336 void smc_clc_init(void) __init;
 337 void smc_clc_get_hostname(u8 **host);
 338
 339 #endif