net/smc/smc_core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  Definitions for SMC Connections, Link Groups and Links
   6  *
   7  *  Copyright IBM Corp. 2016
   8  *
   9  *  Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  10  */
  11
  12 #ifndef _SMC_CORE_H
  13 #define _SMC_CORE_H
  14
  15 #include <linux/atomic.h>
  16 #include <rdma/ib_verbs.h>
  17
  18 #include "smc.h"
  19 #include "smc_ib.h"
  20
  21 #define SMC_RMBS_PER_LGR_MAX    255     /* max. # of RMBs per link group */
  22
  23 struct smc_lgr_list {                   /* list of link group definition */
  24         struct list_head        list;
  25         spinlock_t              lock;   /* protects list of link groups */
  26         u32                     num;    /* unique link group number */
  27 };
  28
  29 enum smc_lgr_role {             /* possible roles of a link group */
  30         SMC_CLNT,       /* client */
  31         SMC_SERV        /* server */
  32 };
  33
  34 enum smc_link_state {                   /* possible states of a link */
  35         SMC_LNK_UNUSED,         /* link is unused */
  36         SMC_LNK_INACTIVE,       /* link is inactive */
  37         SMC_LNK_ACTIVATING,     /* link is being activated */
  38         SMC_LNK_ACTIVE,         /* link is active */
  39 };
  40
  41 #define SMC_WR_BUF_SIZE         48      /* size of work request buffer */
  42
  43 struct smc_wr_buf {
  44         u8      raw[SMC_WR_BUF_SIZE];
  45 };
  46
  47 #define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */
  48
  49 enum smc_wr_reg_state {
  50         POSTED,         /* ib_wr_reg_mr request posted */
  51         CONFIRMED,      /* ib_wr_reg_mr response: successful */
  52         FAILED          /* ib_wr_reg_mr response: failure */
  53 };
  54
  55 struct smc_rdma_sge {                           /* sges for RDMA writes */
  56         struct ib_sge           wr_tx_rdma_sge[SMC_IB_MAX_SEND_SGE];
  57 };
  58
  59 #define SMC_MAX_RDMA_WRITES     2               /* max. # of RDMA writes per
  60                                                  * message send
  61                                                  */
  62
  63 struct smc_rdma_sges {                          /* sges per message send */
  64         struct smc_rdma_sge     tx_rdma_sge[SMC_MAX_RDMA_WRITES];
  65 };
  66
  67 struct smc_rdma_wr {                            /* work requests per message
  68                                                  * send
  69                                                  */
  70         struct ib_rdma_wr       wr_tx_rdma[SMC_MAX_RDMA_WRITES];
  71 };
  72
  73 #define SMC_LGR_ID_SIZE         4
  74
  75 struct smc_link {
  76         struct smc_ib_device    *smcibdev;      /* ib-device */
  77         u8                      ibport;         /* port - values 1 | 2 */
  78         struct ib_pd            *roce_pd;       /* IB protection domain,
  79                                                  * unique for every RoCE QP
  80                                                  */
  81         struct ib_qp            *roce_qp;       /* IB queue pair */
  82         struct ib_qp_attr       qp_attr;        /* IB queue pair attributes */
  83
  84         struct smc_wr_buf       *wr_tx_bufs;    /* WR send payload buffers */
  85         struct ib_send_wr       *wr_tx_ibs;     /* WR send meta data */
  86         struct ib_sge           *wr_tx_sges;    /* WR send gather meta data */
  87         struct smc_rdma_sges    *wr_tx_rdma_sges;/*RDMA WRITE gather meta data*/
  88         struct smc_rdma_wr      *wr_tx_rdmas;   /* WR RDMA WRITE */
  89         struct smc_wr_tx_pend   *wr_tx_pends;   /* WR send waiting for CQE */
  90         struct completion       *wr_tx_compl;   /* WR send CQE completion */
  91         /* above four vectors have wr_tx_cnt elements and use the same index */
  92         dma_addr_t              wr_tx_dma_addr; /* DMA address of wr_tx_bufs */
  93         atomic_long_t           wr_tx_id;       /* seq # of last sent WR */
  94         unsigned long           *wr_tx_mask;    /* bit mask of used indexes */
  95         u32                     wr_tx_cnt;      /* number of WR send buffers */
  96         wait_queue_head_t       wr_tx_wait;     /* wait for free WR send buf */
  97
  98         struct smc_wr_buf       *wr_rx_bufs;    /* WR recv payload buffers */
  99         struct ib_recv_wr       *wr_rx_ibs;     /* WR recv meta data */
 100         struct ib_sge           *wr_rx_sges;    /* WR recv scatter meta data */
 101         /* above three vectors have wr_rx_cnt elements and use the same index */
 102         dma_addr_t              wr_rx_dma_addr; /* DMA address of wr_rx_bufs */
 103         u64                     wr_rx_id;       /* seq # of last recv WR */
 104         u32                     wr_rx_cnt;      /* number of WR recv buffers */
 105         unsigned long           wr_rx_tstamp;   /* jiffies when last buf rx */
 106
 107         struct ib_reg_wr        wr_reg;         /* WR register memory region */
 108         wait_queue_head_t       wr_reg_wait;    /* wait for wr_reg result */
 109         enum smc_wr_reg_state   wr_reg_state;   /* state of wr_reg request */
 110
 111         u8                      gid[SMC_GID_SIZE];/* gid matching used vlan id*/
 112         u8                      sgid_index;     /* gid index for vlan id      */
 113         u32                     peer_qpn;       /* QP number of peer */
 114         enum ib_mtu             path_mtu;       /* used mtu */
 115         enum ib_mtu             peer_mtu;       /* mtu size of peer */
 116         u32                     psn_initial;    /* QP tx initial packet seqno */
 117         u32                     peer_psn;       /* QP rx initial packet seqno */
 118         u8                      peer_mac[ETH_ALEN];     /* = gid[8:10||13:15] */
 119         u8                      peer_gid[SMC_GID_SIZE]; /* gid of peer*/
 120         u8                      link_id;        /* unique # within link group */
 121         u8                      link_uid[SMC_LGR_ID_SIZE]; /* unique lnk id */
 122         u8                      peer_link_uid[SMC_LGR_ID_SIZE]; /* peer uid */
 123         u8                      link_idx;       /* index in lgr link array */
 124         u8                      link_is_asym;   /* is link asymmetric? */
 125         struct smc_link_group   *lgr;           /* parent link group */
 126         struct work_struct      link_down_wrk;  /* wrk to bring link down */
 127
 128         enum smc_link_state     state;          /* state of link */
 129         struct delayed_work     llc_testlink_wrk; /* testlink worker */
 130         struct completion       llc_testlink_resp; /* wait for rx of testlink */
 131         int                     llc_testlink_time; /* testlink interval */
 132 };
 133
 134 /* For now we just allow one parallel link per link group. The SMC protocol
 135  * allows more (up to 8).
 136  */
 137 #define SMC_LINKS_PER_LGR_MAX   3
 138 #define SMC_SINGLE_LINK         0
 139
 140 #define SMC_FIRST_CONTACT       1               /* first contact to a peer */
 141 #define SMC_REUSE_CONTACT       0               /* follow-on contact to a peer*/
 142
 143 /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
 144 struct smc_buf_desc {
 145         struct list_head        list;
 146         void                    *cpu_addr;      /* virtual address of buffer */
 147         struct page             *pages;
 148         int                     len;            /* length of buffer */
 149         u32                     used;           /* currently used / unused */
 150         union {
 151                 struct { /* SMC-R */
 152                         struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];
 153                                         /* virtual buffer */
 154                         struct ib_mr    *mr_rx[SMC_LINKS_PER_LGR_MAX];
 155                                         /* for rmb only: memory region
 156                                          * incl. rkey provided to peer
 157                                          */
 158                         u32             order;  /* allocation order */
 159
 160                         u8              is_conf_rkey;
 161                                         /* confirm_rkey done */
 162                         u8              is_reg_mr[SMC_LINKS_PER_LGR_MAX];
 163                                         /* mem region registered */
 164                         u8              is_map_ib[SMC_LINKS_PER_LGR_MAX];
 165                                         /* mem region mapped to lnk */
 166                         u8              is_reg_err;
 167                                         /* buffer registration err */
 168                 };
 169                 struct { /* SMC-D */
 170                         unsigned short  sba_idx;
 171                                         /* SBA index number */
 172                         u64             token;
 173                                         /* DMB token number */
 174                         dma_addr_t      dma_addr;
 175                                         /* DMA address */
 176                 };
 177         };
 178 };
 179
 180 struct smc_rtoken {                             /* address/key of remote RMB */
 181         u64                     dma_addr;
 182         u32                     rkey;
 183 };
 184
 185 #define SMC_BUF_MIN_SIZE        16384   /* minimum size of an RMB */
 186 #define SMC_RMBE_SIZES          16      /* number of distinct RMBE sizes */
 187 /* theoretically, the RFC states that largest size would be 512K,
 188  * i.e. compressed 5 and thus 6 sizes (0..5), despite
 189  * struct smc_clc_msg_accept_confirm.rmbe_size being a 4 bit value (0..15)
 190  */
 191
 192 struct smcd_dev;
 193
 194 enum smc_lgr_type {                             /* redundancy state of lgr */
 195         SMC_LGR_NONE,                   /* no active links, lgr to be deleted */
 196         SMC_LGR_SINGLE,                 /* 1 active RNIC on each peer */
 197         SMC_LGR_SYMMETRIC,              /* 2 active RNICs on each peer */
 198         SMC_LGR_ASYMMETRIC_PEER,        /* local has 2, peer 1 active RNICs */
 199         SMC_LGR_ASYMMETRIC_LOCAL,       /* local has 1, peer 2 active RNICs */
 200 };
 201
 202 enum smc_llc_flowtype {
 203         SMC_LLC_FLOW_NONE       = 0,
 204         SMC_LLC_FLOW_ADD_LINK   = 2,
 205         SMC_LLC_FLOW_DEL_LINK   = 4,
 206         SMC_LLC_FLOW_RKEY       = 6,
 207 };
 208
 209 struct smc_llc_qentry;
 210
 211 struct smc_llc_flow {
 212         enum smc_llc_flowtype type;
 213         struct smc_llc_qentry *qentry;
 214 };
 215
 216 struct smc_link_group {
 217         struct list_head        list;
 218         struct rb_root          conns_all;      /* connection tree */
 219         rwlock_t                conns_lock;     /* protects conns_all */
 220         unsigned int            conns_num;      /* current # of connections */
 221         unsigned short          vlan_id;        /* vlan id of link group */
 222
 223         struct list_head        sndbufs[SMC_RMBE_SIZES];/* tx buffers */
 224         struct mutex            sndbufs_lock;   /* protects tx buffers */
 225         struct list_head        rmbs[SMC_RMBE_SIZES];   /* rx buffers */
 226         struct mutex            rmbs_lock;      /* protects rx buffers */
 227
 228         u8                      id[SMC_LGR_ID_SIZE];    /* unique lgr id */
 229         struct delayed_work     free_work;      /* delayed freeing of an lgr */
 230         struct work_struct      terminate_work; /* abnormal lgr termination */
 231         u8                      sync_err : 1;   /* lgr no longer fits to peer */
 232         u8                      terminating : 1;/* lgr is terminating */
 233         u8                      freefast : 1;   /* free worker scheduled fast */
 234         u8                      freeing : 1;    /* lgr is being freed */
 235
 236         bool                    is_smcd;        /* SMC-R or SMC-D */
 237         union {
 238                 struct { /* SMC-R */
 239                         enum smc_lgr_role       role;
 240                                                 /* client or server */
 241                         struct smc_link         lnk[SMC_LINKS_PER_LGR_MAX];
 242                                                 /* smc link */
 243                         char                    peer_systemid[SMC_SYSTEMID_LEN];
 244                                                 /* unique system_id of peer */
 245                         struct smc_rtoken       rtokens[SMC_RMBS_PER_LGR_MAX]
 246                                                 [SMC_LINKS_PER_LGR_MAX];
 247                                                 /* remote addr/key pairs */
 248                         DECLARE_BITMAP(rtokens_used_mask, SMC_RMBS_PER_LGR_MAX);
 249                                                 /* used rtoken elements */
 250                         u8                      next_link_id;
 251                         enum smc_lgr_type       type;
 252                                                 /* redundancy state */
 253                         u8                      pnet_id[SMC_MAX_PNETID_LEN + 1];
 254                                                 /* pnet id of this lgr */
 255                         struct list_head        llc_event_q;
 256                                                 /* queue for llc events */
 257                         spinlock_t              llc_event_q_lock;
 258                                                 /* protects llc_event_q */
 259                         struct mutex            llc_conf_mutex;
 260                                                 /* protects lgr reconfig. */
 261                         struct work_struct      llc_add_link_work;
 262                         struct work_struct      llc_del_link_work;
 263                         struct work_struct      llc_event_work;
 264                                                 /* llc event worker */
 265                         wait_queue_head_t       llc_flow_waiter;
 266                                                 /* w4 next llc event */
 267                         wait_queue_head_t       llc_msg_waiter;
 268                                                 /* w4 next llc msg */
 269                         struct smc_llc_flow     llc_flow_lcl;
 270                                                 /* llc local control field */
 271                         struct smc_llc_flow     llc_flow_rmt;
 272                                                 /* llc remote control field */
 273                         struct smc_llc_qentry   *delayed_event;
 274                                                 /* arrived when flow active */
 275                         spinlock_t              llc_flow_lock;
 276                                                 /* protects llc flow */
 277                         int                     llc_testlink_time;
 278                                                 /* link keep alive time */
 279                         u32                     llc_termination_rsn;
 280                                                 /* rsn code for termination */
 281                 };
 282                 struct { /* SMC-D */
 283                         u64                     peer_gid;
 284                                                 /* Peer GID (remote) */
 285                         struct smcd_dev         *smcd;
 286                                                 /* ISM device for VLAN reg. */
 287                         u8                      peer_shutdown : 1;
 288                                                 /* peer triggered shutdownn */
 289                 };
 290         };
 291 };
 292
 293 struct smc_clc_msg_local;
 294
 295 struct smc_init_info {
 296         u8                      is_smcd;
 297         unsigned short          vlan_id;
 298         int                     srv_first_contact;
 299         int                     cln_first_contact;
 300         /* SMC-R */
 301         struct smc_clc_msg_local *ib_lcl;
 302         struct smc_ib_device    *ib_dev;
 303         u8                      ib_gid[SMC_GID_SIZE];
 304         u8                      ib_port;
 305         u32                     ib_clcqpn;
 306         /* SMC-D */
 307         u64                     ism_gid;
 308         struct smcd_dev         *ism_dev;
 309 };
 310
 311 /* Find the connection associated with the given alert token in the link group.
 312  * To use rbtrees we have to implement our own search core.
 313  * Requires @conns_lock
 314  * @token       alert token to search for
 315  * @lgr          link group to search in
 316  * Returns connection associated with token if found, NULL otherwise.
 317  */
 318 static inline struct smc_connection *smc_lgr_find_conn(
 319         u32 token, struct smc_link_group *lgr)
 320 {
 321         struct smc_connection *res = NULL;
 322         struct rb_node *node;
 323
 324         node = lgr->conns_all.rb_node;
 325         while (node) {
 326                 struct smc_connection *cur = rb_entry(node,
 327                                         struct smc_connection, alert_node);
 328
 329                 if (cur->alert_token_local > token) {
 330                         node = node->rb_left;
 331                 } else {
 332                         if (cur->alert_token_local < token) {
 333                                 node = node->rb_right;
 334                         } else {
 335                                 res = cur;
 336                                 break;
 337                         }
 338                 }
 339         }
 340
 341         return res;
 342 }
 343
 344 /* returns true if the specified link is usable */
 345 static inline bool smc_link_usable(struct smc_link *lnk)
 346 {
 347         if (lnk->state == SMC_LNK_UNUSED || lnk->state == SMC_LNK_INACTIVE)
 348                 return false;
 349         return true;
 350 }
 351
 352 static inline bool smc_link_active(struct smc_link *lnk)
 353 {
 354         return lnk->state == SMC_LNK_ACTIVE;
 355 }
 356
 357 struct smc_sock;
 358 struct smc_clc_msg_accept_confirm;
 359 struct smc_clc_msg_local;
 360
 361 void smc_lgr_cleanup_early(struct smc_connection *conn);
 362 void smc_lgr_terminate_sched(struct smc_link_group *lgr);
 363 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);
 364 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport);
 365 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid,
 366                         unsigned short vlan);
 367 void smc_smcd_terminate_all(struct smcd_dev *dev);
 368 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
 369 int smc_buf_create(struct smc_sock *smc, bool is_smcd);
 370 int smc_uncompress_bufsize(u8 compressed);
 371 int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
 372                             struct smc_clc_msg_accept_confirm *clc);
 373 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
 374 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);
 375 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
 376                     __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey);
 377 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
 378                      __be64 nw_vaddr, __be32 nw_rkey);
 379 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn);
 380 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
 381 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
 382 void smc_rmb_sync_sg_for_device(struct smc_connection *conn);
 383 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini);
 384
 385 void smc_conn_free(struct smc_connection *conn);
 386 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini);
 387 void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
 388 int smc_core_init(void);
 389 void smc_core_exit(void);
 390
 391 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
 392                    u8 link_idx, struct smc_init_info *ini);
 393 void smcr_link_clear(struct smc_link *lnk, bool log);
 394 int smcr_buf_map_lgr(struct smc_link *lnk);
 395 int smcr_buf_reg_lgr(struct smc_link *lnk);
 396 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type);
 397 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
 398                             enum smc_lgr_type new_type, int asym_lnk_idx);
 399 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc);
 400 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 401                                   struct smc_link *from_lnk, bool is_dev_err);
 402 void smcr_link_down_cond(struct smc_link *lnk);
 403 void smcr_link_down_cond_sched(struct smc_link *lnk);
 404
 405 static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)
 406 {
 407         return link->lgr;
 408 }
 409 #endif