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_MODEUNSUPP 0x03040000 /* smc modes do not match (R or D)*/ 41 #define SMC_CLC_DECL_RMBE_EC 0x03050000 /* peer has eyecatcher in RMBE */ 42 #define SMC_CLC_DECL_OPTUNSUPP 0x03060000 /* fastopen sockopt not supported */ 43 #define SMC_CLC_DECL_DIFFPREFIX 0x03070000 /* IP prefix / subnet mismatch */ 44 #define SMC_CLC_DECL_GETVLANERR 0x03080000 /* err to get vlan id of ip device*/ 45 #define SMC_CLC_DECL_ISMVLANERR 0x03090000 /* err to reg vlan id on ism dev */ 46 #define SMC_CLC_DECL_NOACTLINK 0x030a0000 /* no active smc-r link in lgr */ 47 #define SMC_CLC_DECL_NOSRVLINK 0x030b0000 /* SMC-R link from srv not found */ 48 #define SMC_CLC_DECL_VERSMISMAT 0x030c0000 /* SMC version mismatch */ 49 #define SMC_CLC_DECL_MAX_DMB 0x030d0000 /* SMC-D DMB limit exceeded */ 50 #define SMC_CLC_DECL_SYNCERR 0x04000000 /* synchronization error */ 51 #define SMC_CLC_DECL_PEERDECL 0x05000000 /* peer declined during handshake */ 52 #define SMC_CLC_DECL_INTERR 0x09990000 /* internal error */ 53 #define SMC_CLC_DECL_ERR_RTOK 0x09990001 /* rtoken handling failed */ 54 #define SMC_CLC_DECL_ERR_RDYLNK 0x09990002 /* ib ready link failed */ 55 #define SMC_CLC_DECL_ERR_REGRMB 0x09990003 /* reg rmb failed */ 56 57 #define SMC_FIRST_CONTACT_MASK 0b10 /* first contact bit within typev2 */ 58 59 struct smc_clc_msg_hdr { /* header1 of clc messages */ 60 u8 eyecatcher[4]; /* eye catcher */ 61 u8 type; /* proposal / accept / confirm / decline */ 62 __be16 length; 63 #if defined(__BIG_ENDIAN_BITFIELD) 64 u8 version : 4, 65 typev2 : 2, 66 typev1 : 2; 67 #elif defined(__LITTLE_ENDIAN_BITFIELD) 68 u8 typev1 : 2, 69 typev2 : 2, 70 version : 4; 71 #endif 72 } __packed; /* format defined in RFC7609 */ 73 74 struct smc_clc_msg_trail { /* trailer of clc messages */ 75 u8 eyecatcher[4]; 76 }; 77 78 struct smc_clc_msg_local { /* header2 of clc messages */ 79 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* unique system id */ 80 u8 gid[16]; /* gid of ib_device port */ 81 u8 mac[6]; /* mac of ib_device port */ 82 }; 83 84 /* Struct would be 4 byte aligned, but it is used in an array that is sent 85 * to peers and must conform to RFC7609, hence we need to use packed here. 86 */ 87 struct smc_clc_ipv6_prefix { 88 struct in6_addr prefix; 89 u8 prefix_len; 90 } __packed; /* format defined in RFC7609 */ 91 92 #if defined(__BIG_ENDIAN_BITFIELD) 93 struct smc_clc_v2_flag { 94 u8 release : 4, 95 rsvd : 3, 96 seid : 1; 97 }; 98 #elif defined(__LITTLE_ENDIAN_BITFIELD) 99 struct smc_clc_v2_flag { 100 u8 seid : 1, 101 rsvd : 3, 102 release : 4; 103 }; 104 #endif 105 106 struct smc_clnt_opts_area_hdr { 107 u8 eid_cnt; /* number of user defined EIDs */ 108 u8 ism_gid_cnt; /* number of ISMv2 GIDs */ 109 u8 reserved1; 110 struct smc_clc_v2_flag flag; 111 u8 reserved2[2]; 112 __be16 smcd_v2_ext_offset; /* SMC-Dv2 Extension Offset */ 113 }; 114 115 struct smc_clc_smcd_gid_chid { 116 __be64 gid; /* ISM GID */ 117 __be16 chid; /* ISMv2 CHID */ 118 } __packed; /* format defined in 119 * IBM Shared Memory Communications Version 2 120 * (https://www.ibm.com/support/pages/node/6326337) 121 */ 122 123 struct smc_clc_v2_extension { 124 struct smc_clnt_opts_area_hdr hdr; 125 u8 roce[16]; /* RoCEv2 GID */ 126 u8 reserved[16]; 127 u8 user_eids[][SMC_MAX_EID_LEN]; 128 }; 129 130 struct smc_clc_msg_proposal_prefix { /* prefix part of clc proposal message*/ 131 __be32 outgoing_subnet; /* subnet mask */ 132 u8 prefix_len; /* number of significant bits in mask */ 133 u8 reserved[2]; 134 u8 ipv6_prefixes_cnt; /* number of IPv6 prefixes in prefix array */ 135 } __aligned(4); 136 137 struct smc_clc_msg_smcd { /* SMC-D GID information */ 138 struct smc_clc_smcd_gid_chid ism; /* ISM native GID+CHID of requestor */ 139 __be16 v2_ext_offset; /* SMC Version 2 Extension Offset */ 140 u8 reserved[28]; 141 }; 142 143 struct smc_clc_smcd_v2_extension { 144 u8 system_eid[SMC_MAX_EID_LEN]; 145 u8 reserved[16]; 146 struct smc_clc_smcd_gid_chid gidchid[]; 147 }; 148 149 struct smc_clc_msg_proposal { /* clc proposal message sent by Linux */ 150 struct smc_clc_msg_hdr hdr; 151 struct smc_clc_msg_local lcl; 152 __be16 iparea_offset; /* offset to IP address information area */ 153 } __aligned(4); 154 155 #define SMC_CLC_MAX_V6_PREFIX 8 156 157 struct smc_clc_msg_proposal_area { 158 struct smc_clc_msg_proposal pclc_base; 159 struct smc_clc_msg_smcd pclc_smcd; 160 struct smc_clc_msg_proposal_prefix pclc_prfx; 161 struct smc_clc_ipv6_prefix pclc_prfx_ipv6[SMC_CLC_MAX_V6_PREFIX]; 162 struct smc_clc_v2_extension pclc_v2_ext; 163 struct smc_clc_smcd_v2_extension pclc_smcd_v2_ext; 164 struct smc_clc_smcd_gid_chid pclc_gidchids[SMC_MAX_ISM_DEVS]; 165 struct smc_clc_msg_trail pclc_trl; 166 }; 167 168 struct smcr_clc_msg_accept_confirm { /* SMCR accept/confirm */ 169 struct smc_clc_msg_local lcl; 170 u8 qpn[3]; /* QP number */ 171 __be32 rmb_rkey; /* RMB rkey */ 172 u8 rmbe_idx; /* Index of RMBE in RMB */ 173 __be32 rmbe_alert_token; /* unique connection id */ 174 #if defined(__BIG_ENDIAN_BITFIELD) 175 u8 rmbe_size : 4, /* buf size (compressed) */ 176 qp_mtu : 4; /* QP mtu */ 177 #elif defined(__LITTLE_ENDIAN_BITFIELD) 178 u8 qp_mtu : 4, 179 rmbe_size : 4; 180 #endif 181 u8 reserved; 182 __be64 rmb_dma_addr; /* RMB virtual address */ 183 u8 reserved2; 184 u8 psn[3]; /* packet sequence number */ 185 } __packed; 186 187 struct smcd_clc_msg_accept_confirm_common { /* SMCD accept/confirm */ 188 u64 gid; /* Sender GID */ 189 u64 token; /* DMB token */ 190 u8 dmbe_idx; /* DMBE index */ 191 #if defined(__BIG_ENDIAN_BITFIELD) 192 u8 dmbe_size : 4, /* buf size (compressed) */ 193 reserved3 : 4; 194 #elif defined(__LITTLE_ENDIAN_BITFIELD) 195 u8 reserved3 : 4, 196 dmbe_size : 4; 197 #endif 198 u16 reserved4; 199 __be32 linkid; /* Link identifier */ 200 } __packed; 201 202 #define SMC_CLC_OS_ZOS 1 203 #define SMC_CLC_OS_LINUX 2 204 #define SMC_CLC_OS_AIX 3 205 206 struct smc_clc_first_contact_ext { 207 u8 reserved1; 208 #if defined(__BIG_ENDIAN_BITFIELD) 209 u8 os_type : 4, 210 release : 4; 211 #elif defined(__LITTLE_ENDIAN_BITFIELD) 212 u8 release : 4, 213 os_type : 4; 214 #endif 215 u8 reserved2[2]; 216 u8 hostname[SMC_MAX_HOSTNAME_LEN]; 217 }; 218 219 struct smc_clc_msg_accept_confirm { /* clc accept / confirm message */ 220 struct smc_clc_msg_hdr hdr; 221 union { 222 struct smcr_clc_msg_accept_confirm r0; /* SMC-R */ 223 struct { /* SMC-D */ 224 struct smcd_clc_msg_accept_confirm_common d0; 225 u32 reserved5[3]; 226 }; 227 }; 228 } __packed; /* format defined in RFC7609 */ 229 230 struct smc_clc_msg_accept_confirm_v2 { /* clc accept / confirm message */ 231 struct smc_clc_msg_hdr hdr; 232 union { 233 struct smcr_clc_msg_accept_confirm r0; /* SMC-R */ 234 struct { /* SMC-D */ 235 struct smcd_clc_msg_accept_confirm_common d0; 236 __be16 chid; 237 u8 eid[SMC_MAX_EID_LEN]; 238 u8 reserved5[8]; 239 }; 240 }; 241 }; 242 243 struct smc_clc_msg_decline { /* clc decline message */ 244 struct smc_clc_msg_hdr hdr; 245 u8 id_for_peer[SMC_SYSTEMID_LEN]; /* sender peer_id */ 246 __be32 peer_diagnosis; /* diagnosis information */ 247 #if defined(__BIG_ENDIAN_BITFIELD) 248 u8 os_type : 4, 249 reserved : 4; 250 #elif defined(__LITTLE_ENDIAN_BITFIELD) 251 u8 reserved : 4, 252 os_type : 4; 253 #endif 254 u8 reserved2[3]; 255 struct smc_clc_msg_trail trl; /* eye catcher "SMCD" or "SMCR" EBCDIC */ 256 } __aligned(4); 257 258 /* determine start of the prefix area within the proposal message */ 259 static inline struct smc_clc_msg_proposal_prefix * 260 smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc) 261 { 262 return (struct smc_clc_msg_proposal_prefix *) 263 ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset)); 264 } 265 266 static inline bool smcr_indicated(int smc_type) 267 { 268 return smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B; 269 } 270 271 static inline bool smcd_indicated(int smc_type) 272 { 273 return smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B; 274 } 275 276 /* get SMC-D info from proposal message */ 277 static inline struct smc_clc_msg_smcd * 278 smc_get_clc_msg_smcd(struct smc_clc_msg_proposal *prop) 279 { 280 if (smcd_indicated(prop->hdr.typev1) && 281 ntohs(prop->iparea_offset) != sizeof(struct smc_clc_msg_smcd)) 282 return NULL; 283 284 return (struct smc_clc_msg_smcd *)(prop + 1); 285 } 286 287 static inline struct smc_clc_v2_extension * 288 smc_get_clc_v2_ext(struct smc_clc_msg_proposal *prop) 289 { 290 struct smc_clc_msg_smcd *prop_smcd = smc_get_clc_msg_smcd(prop); 291 292 if (!prop_smcd || !ntohs(prop_smcd->v2_ext_offset)) 293 return NULL; 294 295 return (struct smc_clc_v2_extension *) 296 ((u8 *)prop_smcd + 297 offsetof(struct smc_clc_msg_smcd, v2_ext_offset) + 298 sizeof(prop_smcd->v2_ext_offset) + 299 ntohs(prop_smcd->v2_ext_offset)); 300 } 301 302 static inline struct smc_clc_smcd_v2_extension * 303 smc_get_clc_smcd_v2_ext(struct smc_clc_v2_extension *prop_v2ext) 304 { 305 if (!prop_v2ext) 306 return NULL; 307 if (!ntohs(prop_v2ext->hdr.smcd_v2_ext_offset)) 308 return NULL; 309 310 return (struct smc_clc_smcd_v2_extension *) 311 ((u8 *)prop_v2ext + 312 offsetof(struct smc_clc_v2_extension, hdr) + 313 offsetof(struct smc_clnt_opts_area_hdr, smcd_v2_ext_offset) + 314 sizeof(prop_v2ext->hdr.smcd_v2_ext_offset) + 315 ntohs(prop_v2ext->hdr.smcd_v2_ext_offset)); 316 } 317 318 struct smcd_dev; 319 struct smc_init_info; 320 321 int smc_clc_prfx_match(struct socket *clcsock, 322 struct smc_clc_msg_proposal_prefix *prop); 323 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 324 u8 expected_type, unsigned long timeout); 325 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version); 326 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini); 327 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 328 u8 version); 329 int smc_clc_send_accept(struct smc_sock *smc, bool srv_first_contact, 330 u8 version); 331 void smc_clc_init(void) __init; 332 333 #endif 334