include/rdma/rdma_vt.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
   2 /*
   3  * Copyright(c) 2016 - 2019 Intel Corporation.
   4  */
   5
   6 #ifndef DEF_RDMA_VT_H
   7 #define DEF_RDMA_VT_H
   8
   9 /*
  10  * Structure that low level drivers will populate in order to register with the
  11  * rdmavt layer.
  12  */
  13
  14 #include <linux/spinlock.h>
  15 #include <linux/list.h>
  16 #include <linux/hash.h>
  17 #include <rdma/ib_verbs.h>
  18 #include <rdma/ib_mad.h>
  19 #include <rdma/rdmavt_mr.h>
  20
  21 #define RVT_MAX_PKEY_VALUES 16
  22
  23 #define RVT_MAX_TRAP_LEN 100 /* Limit pending trap list */
  24 #define RVT_MAX_TRAP_LISTS 5 /*((IB_NOTICE_TYPE_INFO & 0x0F) + 1)*/
  25 #define RVT_TRAP_TIMEOUT 4096 /* 4.096 usec */
  26
  27 struct trap_list {
  28         u32 list_len;
  29         struct list_head list;
  30 };
  31
  32 struct rvt_qp;
  33 struct rvt_qpn_table;
  34 struct rvt_ibport {
  35         struct rvt_qp __rcu *qp[2];
  36         struct ib_mad_agent *send_agent;        /* agent for SMI (traps) */
  37         struct rb_root mcast_tree;
  38         spinlock_t lock;                /* protect changes in this struct */
  39
  40         /* non-zero when timer is set */
  41         unsigned long mkey_lease_timeout;
  42         unsigned long trap_timeout;
  43         __be64 gid_prefix;      /* in network order */
  44         __be64 mkey;
  45         u64 tid;
  46         u32 port_cap_flags;
  47         u16 port_cap3_flags;
  48         u32 pma_sample_start;
  49         u32 pma_sample_interval;
  50         __be16 pma_counter_select[5];
  51         u16 pma_tag;
  52         u16 mkey_lease_period;
  53         u32 sm_lid;
  54         u8 sm_sl;
  55         u8 mkeyprot;
  56         u8 subnet_timeout;
  57         u8 vl_high_limit;
  58
  59         /*
  60          * Driver is expected to keep these up to date. These
  61          * counters are informational only and not required to be
  62          * completely accurate.
  63          */
  64         u64 n_rc_resends;
  65         u64 n_seq_naks;
  66         u64 n_rdma_seq;
  67         u64 n_rnr_naks;
  68         u64 n_other_naks;
  69         u64 n_loop_pkts;
  70         u64 n_pkt_drops;
  71         u64 n_vl15_dropped;
  72         u64 n_rc_timeouts;
  73         u64 n_dmawait;
  74         u64 n_unaligned;
  75         u64 n_rc_dupreq;
  76         u64 n_rc_seqnak;
  77         u64 n_rc_crwaits;
  78         u16 pkey_violations;
  79         u16 qkey_violations;
  80         u16 mkey_violations;
  81
  82         /* Hot-path per CPU counters to avoid cacheline trading to update */
  83         u64 z_rc_acks;
  84         u64 z_rc_qacks;
  85         u64 z_rc_delayed_comp;
  86         u64 __percpu *rc_acks;
  87         u64 __percpu *rc_qacks;
  88         u64 __percpu *rc_delayed_comp;
  89
  90         void *priv; /* driver private data */
  91
  92         /*
  93          * The pkey table is allocated and maintained by the driver. Drivers
  94          * need to have access to this before registering with rdmav. However
  95          * rdmavt will need access to it so drivers need to proviee this during
  96          * the attach port API call.
  97          */
  98         u16 *pkey_table;
  99
 100         struct rvt_ah *sm_ah;
 101
 102         /*
 103          * Keep a list of traps that have not been repressed.  They will be
 104          * resent based on trap_timer.
 105          */
 106         struct trap_list trap_lists[RVT_MAX_TRAP_LISTS];
 107         struct timer_list trap_timer;
 108 };
 109
 110 #define RVT_CQN_MAX 16 /* maximum length of cq name */
 111
 112 #define RVT_SGE_COPY_MEMCPY     0
 113 #define RVT_SGE_COPY_CACHELESS  1
 114 #define RVT_SGE_COPY_ADAPTIVE   2
 115
 116 /*
 117  * Things that are driver specific, module parameters in hfi1 and qib
 118  */
 119 struct rvt_driver_params {
 120         struct ib_device_attr props;
 121
 122         /*
 123          * Anything driver specific that is not covered by props
 124          * For instance special module parameters. Goes here.
 125          */
 126         unsigned int lkey_table_size;
 127         unsigned int qp_table_size;
 128         unsigned int sge_copy_mode;
 129         unsigned int wss_threshold;
 130         unsigned int wss_clean_period;
 131         int qpn_start;
 132         int qpn_inc;
 133         int qpn_res_start;
 134         int qpn_res_end;
 135         int nports;
 136         int npkeys;
 137         int node;
 138         int psn_mask;
 139         int psn_shift;
 140         int psn_modify_mask;
 141         u32 core_cap_flags;
 142         u32 max_mad_size;
 143         u8 qos_shift;
 144         u8 max_rdma_atomic;
 145         u8 extra_rdma_atomic;
 146         u8 reserved_operations;
 147 };
 148
 149 /* User context */
 150 struct rvt_ucontext {
 151         struct ib_ucontext ibucontext;
 152 };
 153
 154 /* Protection domain */
 155 struct rvt_pd {
 156         struct ib_pd ibpd;
 157         bool user;
 158 };
 159
 160 /* Address handle */
 161 struct rvt_ah {
 162         struct ib_ah ibah;
 163         struct rdma_ah_attr attr;
 164         u8 vl;
 165         u8 log_pmtu;
 166 };
 167
 168 /*
 169  * This structure is used by rvt_mmap() to validate an offset
 170  * when an mmap() request is made.  The vm_area_struct then uses
 171  * this as its vm_private_data.
 172  */
 173 struct rvt_mmap_info {
 174         struct list_head pending_mmaps;
 175         struct ib_ucontext *context;
 176         void *obj;
 177         __u64 offset;
 178         struct kref ref;
 179         u32 size;
 180 };
 181
 182 /* memory working set size */
 183 struct rvt_wss {
 184         unsigned long *entries;
 185         atomic_t total_count;
 186         atomic_t clean_counter;
 187         atomic_t clean_entry;
 188
 189         int threshold;
 190         int num_entries;
 191         long pages_mask;
 192         unsigned int clean_period;
 193 };
 194
 195 struct rvt_dev_info;
 196 struct rvt_swqe;
 197 struct rvt_driver_provided {
 198         /*
 199          * Which functions are required depends on which verbs rdmavt is
 200          * providing and which verbs the driver is overriding. See
 201          * check_support() for details.
 202          */
 203
 204         /* hot path calldowns in a single cacheline */
 205
 206         /*
 207          * Give the driver a notice that there is send work to do. It is up to
 208          * the driver to generally push the packets out, this just queues the
 209          * work with the driver. There are two variants here. The no_lock
 210          * version requires the s_lock not to be held. The other assumes the
 211          * s_lock is held.
 212          */
 213         bool (*schedule_send)(struct rvt_qp *qp);
 214         bool (*schedule_send_no_lock)(struct rvt_qp *qp);
 215
 216         /*
 217          * Driver specific work request setup and checking.
 218          * This function is allowed to perform any setup, checks, or
 219          * adjustments required to the SWQE in order to be usable by
 220          * underlying protocols. This includes private data structure
 221          * allocations.
 222          */
 223         int (*setup_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe,
 224                          bool *call_send);
 225
 226         /*
 227          * Sometimes rdmavt needs to kick the driver's send progress. That is
 228          * done by this call back.
 229          */
 230         void (*do_send)(struct rvt_qp *qp);
 231
 232         /*
 233          * Returns a pointer to the undelying hardware's PCI device. This is
 234          * used to display information as to what hardware is being referenced
 235          * in an output message
 236          */
 237         struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
 238
 239         /*
 240          * Allocate a private queue pair data structure for driver specific
 241          * information which is opaque to rdmavt.  Errors are returned via
 242          * ERR_PTR(err).  The driver is free to return NULL or a valid
 243          * pointer.
 244          */
 245         void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
 246
 247         /*
 248          * Init a struture allocated with qp_priv_alloc(). This should be
 249          * called after all qp fields have been initialized in rdmavt.
 250          */
 251         int (*qp_priv_init)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 252                             struct ib_qp_init_attr *init_attr);
 253
 254         /*
 255          * Free the driver's private qp structure.
 256          */
 257         void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
 258
 259         /*
 260          * Inform the driver the particular qp in quesiton has been reset so
 261          * that it can clean up anything it needs to.
 262          */
 263         void (*notify_qp_reset)(struct rvt_qp *qp);
 264
 265         /*
 266          * Get a path mtu from the driver based on qp attributes.
 267          */
 268         int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 269                                   struct ib_qp_attr *attr);
 270
 271         /*
 272          * Notify driver that it needs to flush any outstanding IO requests that
 273          * are waiting on a qp.
 274          */
 275         void (*flush_qp_waiters)(struct rvt_qp *qp);
 276
 277         /*
 278          * Notify driver to stop its queue of sending packets. Nothing else
 279          * should be posted to the queue pair after this has been called.
 280          */
 281         void (*stop_send_queue)(struct rvt_qp *qp);
 282
 283         /*
 284          * Have the drivr drain any in progress operations
 285          */
 286         void (*quiesce_qp)(struct rvt_qp *qp);
 287
 288         /*
 289          * Inform the driver a qp has went to error state.
 290          */
 291         void (*notify_error_qp)(struct rvt_qp *qp);
 292
 293         /*
 294          * Get an MTU for a qp.
 295          */
 296         u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 297                            u32 pmtu);
 298         /*
 299          * Convert an mtu to a path mtu
 300          */
 301         int (*mtu_to_path_mtu)(u32 mtu);
 302
 303         /*
 304          * Get the guid of a port in big endian byte order
 305          */
 306         int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
 307                            int guid_index, __be64 *guid);
 308
 309         /*
 310          * Query driver for the state of the port.
 311          */
 312         int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num,
 313                                 struct ib_port_attr *props);
 314
 315         /*
 316          * Tell driver to shutdown a port
 317          */
 318         int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);
 319
 320         /* Tell driver to send a trap for changed  port capabilities */
 321         void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num);
 322
 323         /*
 324          * The following functions can be safely ignored completely. Any use of
 325          * these is checked for NULL before blindly calling. Rdmavt should also
 326          * be functional if drivers omit these.
 327          */
 328
 329         /* Called to inform the driver that all qps should now be freed. */
 330         unsigned (*free_all_qps)(struct rvt_dev_info *rdi);
 331
 332         /* Driver specific AH validation */
 333         int (*check_ah)(struct ib_device *, struct rdma_ah_attr *);
 334
 335         /* Inform the driver a new AH has been created */
 336         void (*notify_new_ah)(struct ib_device *, struct rdma_ah_attr *,
 337                               struct rvt_ah *);
 338
 339         /* Let the driver pick the next queue pair number*/
 340         int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
 341                          enum ib_qp_type type, u8 port_num);
 342
 343         /* Determine if its safe or allowed to modify the qp */
 344         int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
 345                                int attr_mask, struct ib_udata *udata);
 346
 347         /* Driver specific QP modification/notification-of */
 348         void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
 349                           int attr_mask, struct ib_udata *udata);
 350
 351         /* Notify driver a mad agent has been created */
 352         void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
 353
 354         /* Notify driver a mad agent has been removed */
 355         void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
 356
 357         /* Notify driver to restart rc */
 358         void (*notify_restart_rc)(struct rvt_qp *qp, u32 psn, int wait);
 359
 360         /* Get and return CPU to pin CQ processing thread */
 361         int (*comp_vect_cpu_lookup)(struct rvt_dev_info *rdi, int comp_vect);
 362 };
 363
 364 struct rvt_dev_info {
 365         struct ib_device ibdev; /* Keep this first. Nothing above here */
 366
 367         /*
 368          * Prior to calling for registration the driver will be responsible for
 369          * allocating space for this structure.
 370          *
 371          * The driver will also be responsible for filling in certain members of
 372          * dparms.props. The driver needs to fill in dparms exactly as it would
 373          * want values reported to a ULP. This will be returned to the caller
 374          * in rdmavt's device. The driver should also therefore refrain from
 375          * modifying this directly after registration with rdmavt.
 376          */
 377
 378         /* Driver specific properties */
 379         struct rvt_driver_params dparms;
 380
 381         /* post send table */
 382         const struct rvt_operation_params *post_parms;
 383
 384         /* opcode translation table */
 385         const enum ib_wc_opcode *wc_opcode;
 386
 387         /* Driver specific helper functions */
 388         struct rvt_driver_provided driver_f;
 389
 390         struct rvt_mregion __rcu *dma_mr;
 391         struct rvt_lkey_table lkey_table;
 392
 393         /* Internal use */
 394         int n_pds_allocated;
 395         spinlock_t n_pds_lock; /* Protect pd allocated count */
 396
 397         int n_ahs_allocated;
 398         spinlock_t n_ahs_lock; /* Protect ah allocated count */
 399
 400         u32 n_srqs_allocated;
 401         spinlock_t n_srqs_lock; /* Protect srqs allocated count */
 402
 403         int flags;
 404         struct rvt_ibport **ports;
 405
 406         /* QP */
 407         struct rvt_qp_ibdev *qp_dev;
 408         u32 n_qps_allocated;    /* number of QPs allocated for device */
 409         u32 n_rc_qps;           /* number of RC QPs allocated for device */
 410         u32 busy_jiffies;       /* timeout scaling based on RC QP count */
 411         spinlock_t n_qps_lock;  /* protect qps, rc qps and busy jiffy counts */
 412
 413         /* memory maps */
 414         struct list_head pending_mmaps;
 415         spinlock_t mmap_offset_lock; /* protect mmap_offset */
 416         u32 mmap_offset;
 417         spinlock_t pending_lock; /* protect pending mmap list */
 418
 419         /* CQ */
 420         u32 n_cqs_allocated;    /* number of CQs allocated for device */
 421         spinlock_t n_cqs_lock; /* protect count of in use cqs */
 422
 423         /* Multicast */
 424         u32 n_mcast_grps_allocated; /* number of mcast groups allocated */
 425         spinlock_t n_mcast_grps_lock;
 426
 427         /* Memory Working Set Size */
 428         struct rvt_wss *wss;
 429 };
 430
 431 /**
 432  * rvt_set_ibdev_name - Craft an IB device name from client info
 433  * @rdi: pointer to the client rvt_dev_info structure
 434  * @name: client specific name
 435  * @unit: client specific unit number.
 436  */
 437 static inline void rvt_set_ibdev_name(struct rvt_dev_info *rdi,
 438                                       const char *fmt, const char *name,
 439                                       const int unit)
 440 {
 441         /*
 442          * FIXME: rvt and its users want to touch the ibdev before
 443          * registration and have things like the name work. We don't have the
 444          * infrastructure in the core to support this directly today, hack it
 445          * to work by setting the name manually here.
 446          */
 447         dev_set_name(&rdi->ibdev.dev, fmt, name, unit);
 448         strlcpy(rdi->ibdev.name, dev_name(&rdi->ibdev.dev), IB_DEVICE_NAME_MAX);
 449 }
 450
 451 /**
 452  * rvt_get_ibdev_name - return the IB name
 453  * @rdi: rdmavt device
 454  *
 455  * Return the registered name of the device.
 456  */
 457 static inline const char *rvt_get_ibdev_name(const struct rvt_dev_info *rdi)
 458 {
 459         return dev_name(&rdi->ibdev.dev);
 460 }
 461
 462 static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
 463 {
 464         return container_of(ibpd, struct rvt_pd, ibpd);
 465 }
 466
 467 static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
 468 {
 469         return container_of(ibah, struct rvt_ah, ibah);
 470 }
 471
 472 static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
 473 {
 474         return  container_of(ibdev, struct rvt_dev_info, ibdev);
 475 }
 476
 477 static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
 478 {
 479         /*
 480          * All ports have same number of pkeys.
 481          */
 482         return rdi->dparms.npkeys;
 483 }
 484
 485 /*
 486  * Return the max atomic suitable for determining
 487  * the size of the ack ring buffer in a QP.
 488  */
 489 static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi)
 490 {
 491         return rdi->dparms.max_rdma_atomic +
 492                 rdi->dparms.extra_rdma_atomic + 1;
 493 }
 494
 495 static inline unsigned int rvt_size_atomic(struct rvt_dev_info *rdi)
 496 {
 497         return rdi->dparms.max_rdma_atomic +
 498                 rdi->dparms.extra_rdma_atomic;
 499 }
 500
 501 /*
 502  * Return the indexed PKEY from the port PKEY table.
 503  */
 504 static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi,
 505                                int port_index,
 506                                unsigned index)
 507 {
 508         if (index >= rvt_get_npkeys(rdi))
 509                 return 0;
 510         else
 511                 return rdi->ports[port_index]->pkey_table[index];
 512 }
 513
 514 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
 515 void rvt_dealloc_device(struct rvt_dev_info *rdi);
 516 int rvt_register_device(struct rvt_dev_info *rvd);
 517 void rvt_unregister_device(struct rvt_dev_info *rvd);
 518 int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
 519 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
 520                   int port_index, u16 *pkey_table);
 521 int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
 522                     int access);
 523 int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey);
 524 int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
 525                 u32 len, u64 vaddr, u32 rkey, int acc);
 526 int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
 527                 struct rvt_sge *isge, struct rvt_sge *last_sge,
 528                 struct ib_sge *sge, int acc);
 529 struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
 530                                  u16 lid);
 531
 532 #endif          /* DEF_RDMA_VT_H */