1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Definitions for the SMC module (socket related) 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 #ifndef __SMC_H 12 #define __SMC_H 13 14 #include <linux/socket.h> 15 #include <linux/types.h> 16 #include <linux/compiler.h> /* __aligned */ 17 #include <net/genetlink.h> 18 #include <net/sock.h> 19 20 #include "smc_ib.h" 21 22 #define SMC_V1 1 /* SMC version V1 */ 23 #define SMC_V2 2 /* SMC version V2 */ 24 25 #define SMC_RELEASE_0 0 26 #define SMC_RELEASE_1 1 27 #define SMC_RELEASE SMC_RELEASE_1 /* the latest release version */ 28 29 #define SMCPROTO_SMC 0 /* SMC protocol, IPv4 */ 30 #define SMCPROTO_SMC6 1 /* SMC protocol, IPv6 */ 31 32 #define SMC_AUTOCORKING_DEFAULT_SIZE 0x10000 /* 64K by default */ 33 34 extern struct proto smc_proto; 35 extern struct proto smc_proto6; 36 37 extern struct smc_hashinfo smc_v4_hashinfo; 38 extern struct smc_hashinfo smc_v6_hashinfo; 39 40 int smc_hash_sk(struct sock *sk); 41 void smc_unhash_sk(struct sock *sk); 42 void smc_release_cb(struct sock *sk); 43 44 int smc_release(struct socket *sock); 45 int smc_bind(struct socket *sock, struct sockaddr *uaddr, 46 int addr_len); 47 int smc_connect(struct socket *sock, struct sockaddr *addr, 48 int alen, int flags); 49 int smc_accept(struct socket *sock, struct socket *new_sock, 50 struct proto_accept_arg *arg); 51 int smc_getname(struct socket *sock, struct sockaddr *addr, 52 int peer); 53 __poll_t smc_poll(struct file *file, struct socket *sock, 54 poll_table *wait); 55 int smc_ioctl(struct socket *sock, unsigned int cmd, 56 unsigned long arg); 57 int smc_listen(struct socket *sock, int backlog); 58 int smc_shutdown(struct socket *sock, int how); 59 int smc_setsockopt(struct socket *sock, int level, int optname, 60 sockptr_t optval, unsigned int optlen); 61 int smc_getsockopt(struct socket *sock, int level, int optname, 62 char __user *optval, int __user *optlen); 63 int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len); 64 int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 65 int flags); 66 ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, 67 struct pipe_inode_info *pipe, size_t len, 68 unsigned int flags); 69 70 /* smc sock initialization */ 71 void smc_sk_init(struct net *net, struct sock *sk, int protocol); 72 /* clcsock initialization */ 73 int smc_create_clcsk(struct net *net, struct sock *sk, int family); 74 75 #ifdef ATOMIC64_INIT 76 #define KERNEL_HAS_ATOMIC64 77 #endif 78 79 enum smc_state { /* possible states of an SMC socket */ 80 SMC_ACTIVE = 1, 81 SMC_INIT = 2, 82 SMC_CLOSED = 7, 83 SMC_LISTEN = 10, 84 /* normal close */ 85 SMC_PEERCLOSEWAIT1 = 20, 86 SMC_PEERCLOSEWAIT2 = 21, 87 SMC_APPFINCLOSEWAIT = 24, 88 SMC_APPCLOSEWAIT1 = 22, 89 SMC_APPCLOSEWAIT2 = 23, 90 SMC_PEERFINCLOSEWAIT = 25, 91 /* abnormal close */ 92 SMC_PEERABORTWAIT = 26, 93 SMC_PROCESSABORT = 27, 94 }; 95 96 enum smc_supplemental_features { 97 SMC_SPF_EMULATED_ISM_DEV = 0, 98 }; 99 100 #define SMC_FEATURE_MASK \ 101 (BIT(SMC_SPF_EMULATED_ISM_DEV)) 102 103 struct smc_link_group; 104 105 struct smc_wr_rx_hdr { /* common prefix part of LLC and CDC to demultiplex */ 106 union { 107 u8 type; 108 #if defined(__BIG_ENDIAN_BITFIELD) 109 struct { 110 u8 llc_version:4, 111 llc_type:4; 112 }; 113 #elif defined(__LITTLE_ENDIAN_BITFIELD) 114 struct { 115 u8 llc_type:4, 116 llc_version:4; 117 }; 118 #endif 119 }; 120 } __aligned(1); 121 122 struct smc_cdc_conn_state_flags { 123 #if defined(__BIG_ENDIAN_BITFIELD) 124 u8 peer_done_writing : 1; /* Sending done indicator */ 125 u8 peer_conn_closed : 1; /* Peer connection closed indicator */ 126 u8 peer_conn_abort : 1; /* Abnormal close indicator */ 127 u8 reserved : 5; 128 #elif defined(__LITTLE_ENDIAN_BITFIELD) 129 u8 reserved : 5; 130 u8 peer_conn_abort : 1; 131 u8 peer_conn_closed : 1; 132 u8 peer_done_writing : 1; 133 #endif 134 }; 135 136 struct smc_cdc_producer_flags { 137 #if defined(__BIG_ENDIAN_BITFIELD) 138 u8 write_blocked : 1; /* Writing Blocked, no rx buf space */ 139 u8 urg_data_pending : 1; /* Urgent Data Pending */ 140 u8 urg_data_present : 1; /* Urgent Data Present */ 141 u8 cons_curs_upd_req : 1; /* cursor update requested */ 142 u8 failover_validation : 1;/* message replay due to failover */ 143 u8 reserved : 3; 144 #elif defined(__LITTLE_ENDIAN_BITFIELD) 145 u8 reserved : 3; 146 u8 failover_validation : 1; 147 u8 cons_curs_upd_req : 1; 148 u8 urg_data_present : 1; 149 u8 urg_data_pending : 1; 150 u8 write_blocked : 1; 151 #endif 152 }; 153 154 /* in host byte order */ 155 union smc_host_cursor { /* SMC cursor - an offset in an RMBE */ 156 struct { 157 u16 reserved; 158 u16 wrap; /* window wrap sequence number */ 159 u32 count; /* cursor (= offset) part */ 160 }; 161 #ifdef KERNEL_HAS_ATOMIC64 162 atomic64_t acurs; /* for atomic processing */ 163 #else 164 u64 acurs; /* for atomic processing */ 165 #endif 166 } __aligned(8); 167 168 /* in host byte order, except for flag bitfields in network byte order */ 169 struct smc_host_cdc_msg { /* Connection Data Control message */ 170 struct smc_wr_rx_hdr common; /* .type = 0xFE */ 171 u8 len; /* length = 44 */ 172 u16 seqno; /* connection seq # */ 173 u32 token; /* alert_token */ 174 union smc_host_cursor prod; /* producer cursor */ 175 union smc_host_cursor cons; /* consumer cursor, 176 * piggy backed "ack" 177 */ 178 struct smc_cdc_producer_flags prod_flags; /* conn. tx/rx status */ 179 struct smc_cdc_conn_state_flags conn_state_flags; /* peer conn. status*/ 180 u8 reserved[18]; 181 } __aligned(8); 182 183 enum smc_urg_state { 184 SMC_URG_VALID = 1, /* data present */ 185 SMC_URG_NOTYET = 2, /* data pending */ 186 SMC_URG_READ = 3, /* data was already read */ 187 }; 188 189 struct smc_mark_woken { 190 bool woken; 191 void *key; 192 wait_queue_entry_t wait_entry; 193 }; 194 195 struct smc_connection { 196 struct rb_node alert_node; 197 struct smc_link_group *lgr; /* link group of connection */ 198 struct smc_link *lnk; /* assigned SMC-R link */ 199 u32 alert_token_local; /* unique conn. id */ 200 u8 peer_rmbe_idx; /* from tcp handshake */ 201 int peer_rmbe_size; /* size of peer rx buffer */ 202 atomic_t peer_rmbe_space;/* remaining free bytes in peer 203 * rmbe 204 */ 205 int rtoken_idx; /* idx to peer RMB rkey/addr */ 206 207 struct smc_buf_desc *sndbuf_desc; /* send buffer descriptor */ 208 struct smc_buf_desc *rmb_desc; /* RMBE descriptor */ 209 int rmbe_size_comp; /* compressed notation */ 210 int rmbe_update_limit; 211 /* lower limit for consumer 212 * cursor update 213 */ 214 215 struct smc_host_cdc_msg local_tx_ctrl; /* host byte order staging 216 * buffer for CDC msg send 217 * .prod cf. TCP snd_nxt 218 * .cons cf. TCP sends ack 219 */ 220 union smc_host_cursor local_tx_ctrl_fin; 221 /* prod crsr - confirmed by peer 222 */ 223 union smc_host_cursor tx_curs_prep; /* tx - prepared data 224 * snd_max..wmem_alloc 225 */ 226 union smc_host_cursor tx_curs_sent; /* tx - sent data 227 * snd_nxt ? 228 */ 229 union smc_host_cursor tx_curs_fin; /* tx - confirmed by peer 230 * snd-wnd-begin ? 231 */ 232 atomic_t sndbuf_space; /* remaining space in sndbuf */ 233 u16 tx_cdc_seq; /* sequence # for CDC send */ 234 u16 tx_cdc_seq_fin; /* sequence # - tx completed */ 235 spinlock_t send_lock; /* protect wr_sends */ 236 atomic_t cdc_pend_tx_wr; /* number of pending tx CDC wqe 237 * - inc when post wqe, 238 * - dec on polled tx cqe 239 */ 240 wait_queue_head_t cdc_pend_tx_wq; /* wakeup on no cdc_pend_tx_wr*/ 241 struct delayed_work tx_work; /* retry of smc_cdc_msg_send */ 242 u32 tx_off; /* base offset in peer rmb */ 243 244 struct smc_host_cdc_msg local_rx_ctrl; /* filled during event_handl. 245 * .prod cf. TCP rcv_nxt 246 * .cons cf. TCP snd_una 247 */ 248 union smc_host_cursor rx_curs_confirmed; /* confirmed to peer 249 * source of snd_una ? 250 */ 251 union smc_host_cursor urg_curs; /* points at urgent byte */ 252 enum smc_urg_state urg_state; 253 bool urg_tx_pend; /* urgent data staged */ 254 bool urg_rx_skip_pend; 255 /* indicate urgent oob data 256 * read, but previous regular 257 * data still pending 258 */ 259 char urg_rx_byte; /* urgent byte */ 260 bool tx_in_release_sock; 261 /* flush pending tx data in 262 * sock release_cb() 263 */ 264 atomic_t bytes_to_rcv; /* arrived data, 265 * not yet received 266 */ 267 atomic_t splice_pending; /* number of spliced bytes 268 * pending processing 269 */ 270 #ifndef KERNEL_HAS_ATOMIC64 271 spinlock_t acurs_lock; /* protect cursors */ 272 #endif 273 struct work_struct close_work; /* peer sent some closing */ 274 struct work_struct abort_work; /* abort the connection */ 275 struct tasklet_struct rx_tsklet; /* Receiver tasklet for SMC-D */ 276 u8 rx_off; /* receive offset: 277 * 0 for SMC-R, 32 for SMC-D 278 */ 279 u64 peer_token; /* SMC-D token of peer */ 280 u8 killed : 1; /* abnormal termination */ 281 u8 freed : 1; /* normal termiation */ 282 u8 out_of_sync : 1; /* out of sync with peer */ 283 }; 284 285 struct smc_sock { /* smc sock container */ 286 struct sock sk; 287 #if IS_ENABLED(CONFIG_IPV6) 288 struct ipv6_pinfo *pinet6; 289 #endif 290 struct socket *clcsock; /* internal tcp socket */ 291 void (*clcsk_state_change)(struct sock *sk); 292 /* original stat_change fct. */ 293 void (*clcsk_data_ready)(struct sock *sk); 294 /* original data_ready fct. */ 295 void (*clcsk_write_space)(struct sock *sk); 296 /* original write_space fct. */ 297 void (*clcsk_error_report)(struct sock *sk); 298 /* original error_report fct. */ 299 struct smc_connection conn; /* smc connection */ 300 struct smc_sock *listen_smc; /* listen parent */ 301 struct work_struct connect_work; /* handle non-blocking connect*/ 302 struct work_struct tcp_listen_work;/* handle tcp socket accepts */ 303 struct work_struct smc_listen_work;/* prepare new accept socket */ 304 struct list_head accept_q; /* sockets to be accepted */ 305 spinlock_t accept_q_lock; /* protects accept_q */ 306 bool limit_smc_hs; /* put constraint on handshake */ 307 bool use_fallback; /* fallback to tcp */ 308 int fallback_rsn; /* reason for fallback */ 309 u32 peer_diagnosis; /* decline reason from peer */ 310 atomic_t queued_smc_hs; /* queued smc handshakes */ 311 struct inet_connection_sock_af_ops af_ops; 312 const struct inet_connection_sock_af_ops *ori_af_ops; 313 /* original af ops */ 314 int sockopt_defer_accept; 315 /* sockopt TCP_DEFER_ACCEPT 316 * value 317 */ 318 u8 wait_close_tx_prepared : 1; 319 /* shutdown wr or close 320 * started, waiting for unsent 321 * data to be sent 322 */ 323 u8 connect_nonblock : 1; 324 /* non-blocking connect in 325 * flight 326 */ 327 struct mutex clcsock_release_lock; 328 /* protects clcsock of a listen 329 * socket 330 * */ 331 }; 332 333 #define smc_sk(ptr) container_of_const(ptr, struct smc_sock, sk) 334 smc_init_saved_callbacks(struct smc_sock * smc)335 static inline void smc_init_saved_callbacks(struct smc_sock *smc) 336 { 337 smc->clcsk_state_change = NULL; 338 smc->clcsk_data_ready = NULL; 339 smc->clcsk_write_space = NULL; 340 smc->clcsk_error_report = NULL; 341 } 342 smc_clcsock_user_data(const struct sock * clcsk)343 static inline struct smc_sock *smc_clcsock_user_data(const struct sock *clcsk) 344 { 345 return (struct smc_sock *) 346 ((uintptr_t)clcsk->sk_user_data & ~SK_USER_DATA_NOCOPY); 347 } 348 349 /* save target_cb in saved_cb, and replace target_cb with new_cb */ smc_clcsock_replace_cb(void (** target_cb)(struct sock *),void (* new_cb)(struct sock *),void (** saved_cb)(struct sock *))350 static inline void smc_clcsock_replace_cb(void (**target_cb)(struct sock *), 351 void (*new_cb)(struct sock *), 352 void (**saved_cb)(struct sock *)) 353 { 354 /* only save once */ 355 if (!*saved_cb) 356 *saved_cb = *target_cb; 357 *target_cb = new_cb; 358 } 359 360 /* restore target_cb to saved_cb, and reset saved_cb to NULL */ smc_clcsock_restore_cb(void (** target_cb)(struct sock *),void (** saved_cb)(struct sock *))361 static inline void smc_clcsock_restore_cb(void (**target_cb)(struct sock *), 362 void (**saved_cb)(struct sock *)) 363 { 364 if (!*saved_cb) 365 return; 366 *target_cb = *saved_cb; 367 *saved_cb = NULL; 368 } 369 370 extern struct workqueue_struct *smc_hs_wq; /* wq for handshake work */ 371 extern struct workqueue_struct *smc_close_wq; /* wq for close work */ 372 373 #define SMC_SYSTEMID_LEN 8 374 375 extern u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ 376 377 #define ntohll(x) be64_to_cpu(x) 378 #define htonll(x) cpu_to_be64(x) 379 380 /* convert an u32 value into network byte order, store it into a 3 byte field */ hton24(u8 * net,u32 host)381 static inline void hton24(u8 *net, u32 host) 382 { 383 __be32 t; 384 385 t = cpu_to_be32(host); 386 memcpy(net, ((u8 *)&t) + 1, 3); 387 } 388 389 /* convert a received 3 byte field into host byte order*/ ntoh24(u8 * net)390 static inline u32 ntoh24(u8 *net) 391 { 392 __be32 t = 0; 393 394 memcpy(((u8 *)&t) + 1, net, 3); 395 return be32_to_cpu(t); 396 } 397 398 #ifdef CONFIG_XFRM using_ipsec(struct smc_sock * smc)399 static inline bool using_ipsec(struct smc_sock *smc) 400 { 401 return (smc->clcsock->sk->sk_policy[0] || 402 smc->clcsock->sk->sk_policy[1]) ? true : false; 403 } 404 #else using_ipsec(struct smc_sock * smc)405 static inline bool using_ipsec(struct smc_sock *smc) 406 { 407 return false; 408 } 409 #endif 410 411 struct smc_gidlist; 412 413 struct sock *smc_accept_dequeue(struct sock *parent, struct socket *new_sock); 414 void smc_close_non_accepted(struct sock *sk); 415 void smc_fill_gid_list(struct smc_link_group *lgr, 416 struct smc_gidlist *gidlist, 417 struct smc_ib_device *known_dev, u8 *known_gid); 418 419 /* smc handshake limitation interface for netlink */ 420 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb); 421 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info); 422 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info); 423 smc_sock_set_flag(struct sock * sk,enum sock_flags flag)424 static inline void smc_sock_set_flag(struct sock *sk, enum sock_flags flag) 425 { 426 set_bit(flag, &sk->sk_flags); 427 } 428 429 #endif /* __SMC_H */ 430