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 #include <linux/smc.h>
  18
  19 #include "smc.h"
  20 #include "smc_netlink.h"
  21
  22 #define SMC_CLC_PROPOSAL        0x01
  23 #define SMC_CLC_ACCEPT          0x02
  24 #define SMC_CLC_CONFIRM         0x03
  25 #define SMC_CLC_DECLINE         0x04
  26
  27 #define SMC_TYPE_R              0               /* SMC-R only                 */
  28 #define SMC_TYPE_D              1               /* SMC-D only                 */
  29 #define SMC_TYPE_N              2               /* neither SMC-R nor SMC-D    */
  30 #define SMC_TYPE_B              3               /* SMC-R and SMC-D            */
  31 #define CLC_WAIT_TIME           (6 * HZ)        /* max. wait time on clcsock  */
  32 #define CLC_WAIT_TIME_SHORT     HZ              /* short wait time on clcsock */
  33 #define SMC_CLC_DECL_MEM        0x01010000  /* insufficient memory resources  */
  34 #define SMC_CLC_DECL_TIMEOUT_CL 0x02010000  /* timeout w4 QP confirm link     */
  35 #define SMC_CLC_DECL_TIMEOUT_AL 0x02020000  /* timeout w4 QP add link         */
  36 #define SMC_CLC_DECL_CNFERR     0x03000000  /* configuration error            */
  37 #define SMC_CLC_DECL_PEERNOSMC  0x03010000  /* peer did not indicate SMC      */
  38 #define SMC_CLC_DECL_IPSEC      0x03020000  /* IPsec usage                    */
  39 #define SMC_CLC_DECL_NOSMCDEV   0x03030000  /* no SMC device found (R or D)   */
  40 #define SMC_CLC_DECL_NOSMCDDEV  0x03030001  /* no SMC-D device found          */
  41 #define SMC_CLC_DECL_NOSMCRDEV  0x03030002  /* no SMC-R device found          */
  42 #define SMC_CLC_DECL_NOISM2SUPP 0x03030003  /* hardware has no ISMv2 support  */
  43 #define SMC_CLC_DECL_NOV2EXT    0x03030004  /* peer sent no clc v2 extension  */
  44 #define SMC_CLC_DECL_NOV2DEXT   0x03030005  /* peer sent no clc SMC-Dv2 ext.  */
  45 #define SMC_CLC_DECL_NOSEID     0x03030006  /* peer sent no SEID              */
  46 #define SMC_CLC_DECL_NOSMCD2DEV 0x03030007  /* no SMC-Dv2 device found        */
  47 #define SMC_CLC_DECL_NOUEID     0x03030008  /* peer sent no UEID              */
  48 #define SMC_CLC_DECL_RELEASEERR 0x03030009  /* release version negotiate failed */
  49 #define SMC_CLC_DECL_MAXCONNERR 0x0303000a  /* max connections negotiate failed */
  50 #define SMC_CLC_DECL_MAXLINKERR 0x0303000b  /* max links negotiate failed */
  51 #define SMC_CLC_DECL_MODEUNSUPP 0x03040000  /* smc modes do not match (R or D)*/
  52 #define SMC_CLC_DECL_RMBE_EC    0x03050000  /* peer has eyecatcher in RMBE    */
  53 #define SMC_CLC_DECL_OPTUNSUPP  0x03060000  /* fastopen sockopt not supported */
  54 #define SMC_CLC_DECL_DIFFPREFIX 0x03070000  /* IP prefix / subnet mismatch    */
  55 #define SMC_CLC_DECL_GETVLANERR 0x03080000  /* err to get vlan id of ip device*/
  56 #define SMC_CLC_DECL_ISMVLANERR 0x03090000  /* err to reg vlan id on ism dev  */
  57 #define SMC_CLC_DECL_NOACTLINK  0x030a0000  /* no active smc-r link in lgr    */
  58 #define SMC_CLC_DECL_NOSRVLINK  0x030b0000  /* SMC-R link from srv not found  */
  59 #define SMC_CLC_DECL_VERSMISMAT 0x030c0000  /* SMC version mismatch           */
  60 #define SMC_CLC_DECL_MAX_DMB    0x030d0000  /* SMC-D DMB limit exceeded       */
  61 #define SMC_CLC_DECL_NOROUTE    0x030e0000  /* SMC-Rv2 conn. no route to peer */
  62 #define SMC_CLC_DECL_NOINDIRECT 0x030f0000  /* SMC-Rv2 conn. indirect mismatch*/
  63 #define SMC_CLC_DECL_SYNCERR    0x04000000  /* synchronization error          */
  64 #define SMC_CLC_DECL_PEERDECL   0x05000000  /* peer declined during handshake */
  65 #define SMC_CLC_DECL_INTERR     0x09990000  /* internal error                 */
  66 #define SMC_CLC_DECL_ERR_RTOK   0x09990001  /*   rtoken handling failed       */
  67 #define SMC_CLC_DECL_ERR_RDYLNK 0x09990002  /*   ib ready link failed         */
  68 #define SMC_CLC_DECL_ERR_REGBUF 0x09990003  /*   reg rdma bufs failed         */
  69
  70 #define SMC_FIRST_CONTACT_MASK  0b10    /* first contact bit within typev2 */
  71
  72 struct smc_clc_msg_hdr {        /* header1 of clc messages */
  73         u8 eyecatcher[4];       /* eye catcher */
  74         u8 type;                /* proposal / accept / confirm / decline */
  75         __be16 length;
  76 #if defined(__BIG_ENDIAN_BITFIELD)
  77         u8 version : 4,
  78            typev2  : 2,
  79            typev1  : 2;
  80 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  81         u8 typev1  : 2,
  82            typev2  : 2,
  83            version : 4;
  84 #endif
  85 } __packed;                     /* format defined in RFC7609 */
  86
  87 struct smc_clc_msg_trail {      /* trailer of clc messages */
  88         u8 eyecatcher[4];
  89 };
  90
  91 struct smc_clc_msg_local {      /* header2 of clc messages */
  92         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */
  93         u8 gid[16];             /* gid of ib_device port */
  94         u8 mac[6];              /* mac of ib_device port */
  95 };
  96
  97 /* Struct would be 4 byte aligned, but it is used in an array that is sent
  98  * to peers and must conform to RFC7609, hence we need to use packed here.
  99  */
 100 struct smc_clc_ipv6_prefix {
 101         struct in6_addr prefix;
 102         u8 prefix_len;
 103 } __packed;                     /* format defined in RFC7609 */
 104
 105 #if defined(__BIG_ENDIAN_BITFIELD)
 106 struct smc_clc_v2_flag {
 107         u8 release : 4,
 108            rsvd    : 3,
 109            seid    : 1;
 110 };
 111 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 112 struct smc_clc_v2_flag {
 113         u8 seid   : 1,
 114         rsvd      : 3,
 115         release   : 4;
 116 };
 117 #endif
 118
 119 struct smc_clnt_opts_area_hdr {
 120         u8 eid_cnt;             /* number of user defined EIDs */
 121         u8 ism_gid_cnt;         /* number of ISMv2 GIDs */
 122         u8 reserved1;
 123         struct smc_clc_v2_flag flag;
 124         u8 reserved2[2];
 125         __be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */
 126 };
 127
 128 struct smc_clc_smcd_gid_chid {
 129         __be64 gid;             /* ISM GID */
 130         __be16 chid;            /* ISMv2 CHID */
 131 } __packed;             /* format defined in
 132                          * IBM Shared Memory Communications Version 2
 133                          * (https://www.ibm.com/support/pages/node/6326337)
 134                          */
 135
 136 struct smc_clc_v2_extension {
 137         /* New members must be added within the struct_group() macro below. */
 138         struct_group_tagged(smc_clc_v2_extension_fixed, fixed,
 139                 struct smc_clnt_opts_area_hdr hdr;
 140                 u8 roce[16];            /* RoCEv2 GID */
 141                 u8 max_conns;
 142                 u8 max_links;
 143                 __be16 feature_mask;
 144                 u8 reserved[12];
 145         );
 146         u8 user_eids[][SMC_MAX_EID_LEN];
 147 };
 148 static_assert(offsetof(struct smc_clc_v2_extension, user_eids) == sizeof(struct smc_clc_v2_extension_fixed),
 149               "struct member likely outside of struct_group_tagged()");
 150
 151 struct smc_clc_msg_proposal_prefix {    /* prefix part of clc proposal message*/
 152         __be32 outgoing_subnet; /* subnet mask */
 153         u8 prefix_len;          /* number of significant bits in mask */
 154         u8 reserved[2];
 155         u8 ipv6_prefixes_cnt;   /* number of IPv6 prefixes in prefix array */
 156 } __aligned(4);
 157
 158 struct smc_clc_msg_smcd {       /* SMC-D GID information */
 159         struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requester */
 160         __be16 v2_ext_offset;   /* SMC Version 2 Extension Offset */
 161         u8 vendor_oui[3];       /* vendor organizationally unique identifier */
 162         u8 vendor_exp_options[5];
 163         u8 reserved[20];
 164 };
 165
 166 struct smc_clc_smcd_v2_extension {
 167         /* New members must be added within the struct_group() macro below. */
 168         struct_group_tagged(smc_clc_smcd_v2_extension_fixed, fixed,
 169                 u8 system_eid[SMC_MAX_EID_LEN];
 170                 u8 reserved[16];
 171         );
 172         struct smc_clc_smcd_gid_chid gidchid[];
 173 };
 174 static_assert(offsetof(struct smc_clc_smcd_v2_extension, gidchid) == sizeof(struct smc_clc_smcd_v2_extension_fixed),
 175               "struct member likely outside of struct_group_tagged()");
 176
 177 struct smc_clc_msg_proposal {   /* clc proposal message sent by Linux */
 178         struct smc_clc_msg_hdr hdr;
 179         struct smc_clc_msg_local lcl;
 180         __be16 iparea_offset;   /* offset to IP address information area */
 181 } __aligned(4);
 182
 183 #define SMC_CLC_MAX_V6_PREFIX           8
 184 #define SMC_CLC_MAX_UEID                8
 185 #define SMCD_CLC_MAX_V2_GID_ENTRIES     8 /* max # of CHID-GID entries in CLC
 186                                            * proposal SMC-Dv2 extension.
 187                                            * each ISM device takes one entry and
 188                                            * each Emulated-ISM takes two entries
 189                                            */
 190
 191 struct smc_clc_msg_proposal_area {
 192         struct smc_clc_msg_proposal             pclc_base;
 193         struct smc_clc_msg_smcd                 pclc_smcd;
 194         struct smc_clc_msg_proposal_prefix      pclc_prfx;
 195         struct smc_clc_ipv6_prefix      pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX];
 196         struct smc_clc_v2_extension_fixed       pclc_v2_ext;
 197         u8                      user_eids[SMC_CLC_MAX_UEID][SMC_MAX_EID_LEN];
 198         struct smc_clc_smcd_v2_extension_fixed  pclc_smcd_v2_ext;
 199         struct smc_clc_smcd_gid_chid
 200                                 pclc_gidchids[SMCD_CLC_MAX_V2_GID_ENTRIES];
 201         struct smc_clc_msg_trail                pclc_trl;
 202 };
 203
 204 struct smcr_clc_msg_accept_confirm {    /* SMCR accept/confirm */
 205         struct smc_clc_msg_local lcl;
 206         u8 qpn[3];                      /* QP number */
 207         __be32 rmb_rkey;                /* RMB rkey */
 208         u8 rmbe_idx;                    /* Index of RMBE in RMB */
 209         __be32 rmbe_alert_token;        /* unique connection id */
 210  #if defined(__BIG_ENDIAN_BITFIELD)
 211         u8 rmbe_size : 4,               /* buf size (compressed) */
 212            qp_mtu   : 4;                /* QP mtu */
 213 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 214         u8 qp_mtu   : 4,
 215            rmbe_size : 4;
 216 #endif
 217         u8 reserved;
 218         __be64 rmb_dma_addr;    /* RMB virtual address */
 219         u8 reserved2;
 220         u8 psn[3];              /* packet sequence number */
 221 } __packed;
 222
 223 struct smcd_clc_msg_accept_confirm_common {     /* SMCD accept/confirm */
 224         __be64 gid;             /* Sender GID */
 225         __be64 token;           /* DMB token */
 226         u8 dmbe_idx;            /* DMBE index */
 227 #if defined(__BIG_ENDIAN_BITFIELD)
 228         u8 dmbe_size : 4,       /* buf size (compressed) */
 229            reserved3 : 4;
 230 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 231         u8 reserved3 : 4,
 232            dmbe_size : 4;
 233 #endif
 234         u16 reserved4;
 235         __be32 linkid;          /* Link identifier */
 236 } __packed;
 237
 238 #define SMC_CLC_OS_ZOS          1
 239 #define SMC_CLC_OS_LINUX        2
 240 #define SMC_CLC_OS_AIX          3
 241
 242 struct smc_clc_first_contact_ext {
 243 #if defined(__BIG_ENDIAN_BITFIELD)
 244         u8 v2_direct : 1,
 245            reserved  : 7;
 246         u8 os_type : 4,
 247            release : 4;
 248 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 249         u8 reserved  : 7,
 250            v2_direct : 1;
 251         u8 release : 4,
 252            os_type : 4;
 253 #endif
 254         u8 reserved2[2];
 255         u8 hostname[SMC_MAX_HOSTNAME_LEN];
 256 };
 257
 258 struct smc_clc_first_contact_ext_v2x {
 259         struct smc_clc_first_contact_ext fce_v2_base;
 260         union {
 261                 struct {
 262                         u8 max_conns; /* for SMC-R only */
 263                         u8 max_links; /* for SMC-R only */
 264                 };
 265                 u8 reserved3[2];        /* for SMC-D only */
 266         };
 267         __be16 feature_mask;
 268         __be32 vendor_exp_options;
 269         u8 reserved4[8];
 270 } __packed;             /* format defined in
 271                          * IBM Shared Memory Communications Version 2 (Third Edition)
 272                          * (https://www.ibm.com/support/pages/node/7009315)
 273                          */
 274
 275 struct smc_clc_fce_gid_ext {
 276         u8 gid_cnt;
 277         u8 reserved2[3];
 278         u8 gid[][SMC_GID_SIZE];
 279 };
 280
 281 struct smc_clc_msg_accept_confirm {     /* clc accept / confirm message */
 282         struct smc_clc_msg_hdr hdr;
 283         union {
 284                 struct { /* SMC-R */
 285                         struct smcr_clc_msg_accept_confirm r0;
 286                         struct { /* v2 only */
 287                                 u8 eid[SMC_MAX_EID_LEN];
 288                                 u8 reserved6[8];
 289                         } __packed r1;
 290                 };
 291                 struct { /* SMC-D */
 292                         struct smcd_clc_msg_accept_confirm_common d0;
 293                         struct { /* v2 only, but 12 bytes reserved in v1 */
 294                                 __be16 chid;
 295                                 u8 eid[SMC_MAX_EID_LEN];
 296                                 __be64 gid_ext;
 297                         } __packed d1;
 298                 };
 299         };
 300 };
 301
 302 struct smc_clc_msg_decline {    /* clc decline message */
 303         struct smc_clc_msg_hdr hdr;
 304         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 305         __be32 peer_diagnosis;  /* diagnosis information */
 306 #if defined(__BIG_ENDIAN_BITFIELD)
 307         u8 os_type  : 4,
 308            reserved : 4;
 309 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 310         u8 reserved : 4,
 311            os_type  : 4;
 312 #endif
 313         u8 reserved2[3];
 314         struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
 315 } __aligned(4);
 316
 317 #define SMC_DECL_DIAG_COUNT_V2  4 /* no. of additional peer diagnosis codes */
 318
 319 struct smc_clc_msg_decline_v2 { /* clc decline message */
 320         struct smc_clc_msg_hdr hdr;
 321         u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */
 322         __be32 peer_diagnosis;  /* diagnosis information */
 323 #if defined(__BIG_ENDIAN_BITFIELD)
 324         u8 os_type  : 4,
 325            reserved : 4;
 326 #elif defined(__LITTLE_ENDIAN_BITFIELD)
 327         u8 reserved : 4,
 328            os_type  : 4;
 329 #endif
 330         u8 reserved2[3];
 331         __be32 peer_diagnosis_v2[SMC_DECL_DIAG_COUNT_V2];
 332         struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */
 333 } __aligned(4);
 334
 335 /* determine start of the prefix area within the proposal message */
 336 static inline struct smc_clc_msg_proposal_prefix *
 337 smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
 338 {
 339         return (struct smc_clc_msg_proposal_prefix *)
 340                ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
 341 }
 342
 343 static inline bool smcr_indicated(int smc_type)
 344 {
 345         return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B;
 346 }
 347
 348 static inline bool smcd_indicated(int smc_type)
 349 {
 350         return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B;
 351 }
 352
 353 static inline u8 smc_indicated_type(int is_smcd, int is_smcr)
 354 {
 355         if (is_smcd && is_smcr)
 356                 return SMC_TYPE_B;
 357         if (is_smcd)
 358                 return SMC_TYPE_D;
 359         if (is_smcr)
 360                 return SMC_TYPE_R;
 361         return SMC_TYPE_N;
 362 }
 363
 364 /* get SMC-D info from proposal message */
 365 static inline struct smc_clc_msg_smcd *
 366 smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop)
 367 {
 368         if (smcd_indicated(prop->hdr.typev1) &&
 369             ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd))
 370                 return NULL;
 371
 372         return (struct smc_clc_msg_smcd *)(prop + 1);
 373 }
 374
 375 static inline struct smc_clc_v2_extension *
 376 smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop)
 377 {
 378         struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop);
 379
 380         if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset))
 381                 return NULL;
 382
 383         return (struct smc_clc_v2_extension *)
 384                ((u8 *)prop_smcd +
 385                offsetof(struct smc_clc_msg_smcd, v2_ext_offset) +
 386                sizeof(prop_smcd->v2_ext_offset) +
 387                ntohs(prop_smcd->v2_ext_offset));
 388 }
 389
 390 static inline struct smc_clc_smcd_v2_extension *
 391 smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext)
 392 {
 393         if (!prop_v2ext)
 394                 return NULL;
 395         if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset))
 396                 return NULL;
 397
 398         return (struct smc_clc_smcd_v2_extension *)
 399                 ((u8 *)prop_v2ext +
 400                  offsetof(struct smc_clc_v2_extension, hdr) +
 401                  offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) +
 402                  sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) +
 403                  ntohs(prop_v2ext->hdr.smcd_v2_ext_offset));
 404 }
 405
 406 static inline struct smc_clc_first_contact_ext *
 407 smc_get_clc_first_contact_ext(struct smc_clc_msg_accept_confirm *clc,
 408                               bool is_smcd)
 409 {
 410         int clc_v2_len;
 411
 412         if (clc->hdr.version == SMC_V1 ||
 413             !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
 414                 return NULL;
 415
 416         if (is_smcd)
 417                 clc_v2_len =
 418                         offsetofend(struct smc_clc_msg_accept_confirm, d1);
 419         else
 420                 clc_v2_len =
 421                         offsetofend(struct smc_clc_msg_accept_confirm, r1);
 422
 423         return (struct smc_clc_first_contact_ext *)(((u8 *)clc) + clc_v2_len);
 424 }
 425
 426 struct smcd_dev;
 427 struct smc_init_info;
 428
 429 int smc_clc_prfx_match(struct socket *clcsock,
 430                        struct smc_clc_msg_proposal_prefix *prop);
 431 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 432                      u8 expected_type, unsigned long timeout);
 433 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version);
 434 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini);
 435 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact,
 436                          u8 version, u8 *eid, struct smc_init_info *ini);
 437 int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact,
 438                         u8 version, u8 *negotiated_eid, struct smc_init_info *ini);
 439 int smc_clc_srv_v2x_features_validate(struct smc_sock *smc,
 440                                       struct smc_clc_msg_proposal *pclc,
 441                                       struct smc_init_info *ini);
 442 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
 443                                        struct smc_init_info *ini);
 444 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc,
 445                                        struct smc_init_info *ini);
 446 void smc_clc_init(void) __init;
 447 void smc_clc_exit(void);
 448 void smc_clc_get_hostname(u8 **host);
 449 bool smc_clc_match_eid(u8 *negotiated_eid,
 450                        struct smc_clc_v2_extension *smc_v2_ext,
 451                        u8 *peer_eid, u8 *local_eid);
 452 int smc_clc_ueid_count(void);
 453 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb);
 454 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info);
 455 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info);
 456 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info);
 457 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb);
 458 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info);
 459 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info);
 460
 461 #endif