include/rdma/rdma_vt.h

   1 #ifndef DEF_RDMA_VT_H
   2 #define DEF_RDMA_VT_H
   3
   4 /*
   5  * Copyright(c) 2016 - 2018 Intel Corporation.
   6  *
   7  * This file is provided under a dual BSD/GPLv2 license.  When using or
   8  * redistributing this file, you may do so under either license.
   9  *
  10  * GPL LICENSE SUMMARY
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * BSD LICENSE
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  *
  27  *  - Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  *  - Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in
  31  *    the documentation and/or other materials provided with the
  32  *    distribution.
  33  *  - Neither the name of Intel Corporation nor the names of its
  34  *    contributors may be used to endorse or promote products derived
  35  *    from this software without specific prior written permission.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  38  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  39  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  40  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  41  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  44  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  45  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  46  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  47  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  48  *
  49  */
  50
  51 /*
  52  * Structure that low level drivers will populate in order to register with the
  53  * rdmavt layer.
  54  */
  55
  56 #include <linux/spinlock.h>
  57 #include <linux/list.h>
  58 #include <linux/hash.h>
  59 #include <rdma/ib_verbs.h>
  60 #include <rdma/ib_mad.h>
  61 #include <rdma/rdmavt_mr.h>
  62 #include <rdma/rdmavt_qp.h>
  63
  64 #define RVT_MAX_PKEY_VALUES 16
  65
  66 #define RVT_MAX_TRAP_LEN 100 /* Limit pending trap list */
  67 #define RVT_MAX_TRAP_LISTS 5 /*((IB_NOTICE_TYPE_INFO & 0x0F) + 1)*/
  68 #define RVT_TRAP_TIMEOUT 4096 /* 4.096 usec */
  69
  70 struct trap_list {
  71         u32 list_len;
  72         struct list_head list;
  73 };
  74
  75 struct rvt_ibport {
  76         struct rvt_qp __rcu *qp[2];
  77         struct ib_mad_agent *send_agent;        /* agent for SMI (traps) */
  78         struct rb_root mcast_tree;
  79         spinlock_t lock;                /* protect changes in this struct */
  80
  81         /* non-zero when timer is set */
  82         unsigned long mkey_lease_timeout;
  83         unsigned long trap_timeout;
  84         __be64 gid_prefix;      /* in network order */
  85         __be64 mkey;
  86         u64 tid;
  87         u32 port_cap_flags;
  88         u16 port_cap3_flags;
  89         u32 pma_sample_start;
  90         u32 pma_sample_interval;
  91         __be16 pma_counter_select[5];
  92         u16 pma_tag;
  93         u16 mkey_lease_period;
  94         u32 sm_lid;
  95         u8 sm_sl;
  96         u8 mkeyprot;
  97         u8 subnet_timeout;
  98         u8 vl_high_limit;
  99
 100         /*
 101          * Driver is expected to keep these up to date. These
 102          * counters are informational only and not required to be
 103          * completely accurate.
 104          */
 105         u64 n_rc_resends;
 106         u64 n_seq_naks;
 107         u64 n_rdma_seq;
 108         u64 n_rnr_naks;
 109         u64 n_other_naks;
 110         u64 n_loop_pkts;
 111         u64 n_pkt_drops;
 112         u64 n_vl15_dropped;
 113         u64 n_rc_timeouts;
 114         u64 n_dmawait;
 115         u64 n_unaligned;
 116         u64 n_rc_dupreq;
 117         u64 n_rc_seqnak;
 118         u16 pkey_violations;
 119         u16 qkey_violations;
 120         u16 mkey_violations;
 121
 122         /* Hot-path per CPU counters to avoid cacheline trading to update */
 123         u64 z_rc_acks;
 124         u64 z_rc_qacks;
 125         u64 z_rc_delayed_comp;
 126         u64 __percpu *rc_acks;
 127         u64 __percpu *rc_qacks;
 128         u64 __percpu *rc_delayed_comp;
 129
 130         void *priv; /* driver private data */
 131
 132         /*
 133          * The pkey table is allocated and maintained by the driver. Drivers
 134          * need to have access to this before registering with rdmav. However
 135          * rdmavt will need access to it so drivers need to proviee this during
 136          * the attach port API call.
 137          */
 138         u16 *pkey_table;
 139
 140         struct rvt_ah *sm_ah;
 141
 142         /*
 143          * Keep a list of traps that have not been repressed.  They will be
 144          * resent based on trap_timer.
 145          */
 146         struct trap_list trap_lists[RVT_MAX_TRAP_LISTS];
 147         struct timer_list trap_timer;
 148 };
 149
 150 #define RVT_CQN_MAX 16 /* maximum length of cq name */
 151
 152 #define RVT_SGE_COPY_MEMCPY     0
 153 #define RVT_SGE_COPY_CACHELESS  1
 154 #define RVT_SGE_COPY_ADAPTIVE   2
 155
 156 /*
 157  * Things that are driver specific, module parameters in hfi1 and qib
 158  */
 159 struct rvt_driver_params {
 160         struct ib_device_attr props;
 161
 162         /*
 163          * Anything driver specific that is not covered by props
 164          * For instance special module parameters. Goes here.
 165          */
 166         unsigned int lkey_table_size;
 167         unsigned int qp_table_size;
 168         unsigned int sge_copy_mode;
 169         unsigned int wss_threshold;
 170         unsigned int wss_clean_period;
 171         int qpn_start;
 172         int qpn_inc;
 173         int qpn_res_start;
 174         int qpn_res_end;
 175         int nports;
 176         int npkeys;
 177         int node;
 178         int psn_mask;
 179         int psn_shift;
 180         int psn_modify_mask;
 181         u32 core_cap_flags;
 182         u32 max_mad_size;
 183         u8 qos_shift;
 184         u8 max_rdma_atomic;
 185         u8 reserved_operations;
 186 };
 187
 188 /* Protection domain */
 189 struct rvt_pd {
 190         struct ib_pd ibpd;
 191         bool user;
 192 };
 193
 194 /* Address handle */
 195 struct rvt_ah {
 196         struct ib_ah ibah;
 197         struct rdma_ah_attr attr;
 198         atomic_t refcount;
 199         u8 vl;
 200         u8 log_pmtu;
 201 };
 202
 203 /* memory working set size */
 204 struct rvt_wss {
 205         unsigned long *entries;
 206         atomic_t total_count;
 207         atomic_t clean_counter;
 208         atomic_t clean_entry;
 209
 210         int threshold;
 211         int num_entries;
 212         long pages_mask;
 213         unsigned int clean_period;
 214 };
 215
 216 struct rvt_dev_info;
 217 struct rvt_swqe;
 218 struct rvt_driver_provided {
 219         /*
 220          * Which functions are required depends on which verbs rdmavt is
 221          * providing and which verbs the driver is overriding. See
 222          * check_support() for details.
 223          */
 224
 225         /* hot path calldowns in a single cacheline */
 226
 227         /*
 228          * Give the driver a notice that there is send work to do. It is up to
 229          * the driver to generally push the packets out, this just queues the
 230          * work with the driver. There are two variants here. The no_lock
 231          * version requires the s_lock not to be held. The other assumes the
 232          * s_lock is held.
 233          */
 234         bool (*schedule_send)(struct rvt_qp *qp);
 235         bool (*schedule_send_no_lock)(struct rvt_qp *qp);
 236
 237         /*
 238          * Driver specific work request setup and checking.
 239          * This function is allowed to perform any setup, checks, or
 240          * adjustments required to the SWQE in order to be usable by
 241          * underlying protocols. This includes private data structure
 242          * allocations.
 243          */
 244         int (*setup_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe,
 245                          bool *call_send);
 246
 247         /*
 248          * Sometimes rdmavt needs to kick the driver's send progress. That is
 249          * done by this call back.
 250          */
 251         void (*do_send)(struct rvt_qp *qp);
 252
 253         /* Passed to ib core registration. Callback to create syfs files */
 254         int (*port_callback)(struct ib_device *, u8, struct kobject *);
 255
 256         /*
 257          * Returns a pointer to the undelying hardware's PCI device. This is
 258          * used to display information as to what hardware is being referenced
 259          * in an output message
 260          */
 261         struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
 262
 263         /*
 264          * Allocate a private queue pair data structure for driver specific
 265          * information which is opaque to rdmavt.  Errors are returned via
 266          * ERR_PTR(err).  The driver is free to return NULL or a valid
 267          * pointer.
 268          */
 269         void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
 270
 271         /*
 272          * Init a struture allocated with qp_priv_alloc(). This should be
 273          * called after all qp fields have been initialized in rdmavt.
 274          */
 275         int (*qp_priv_init)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 276                             struct ib_qp_init_attr *init_attr);
 277
 278         /*
 279          * Free the driver's private qp structure.
 280          */
 281         void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
 282
 283         /*
 284          * Inform the driver the particular qp in quesiton has been reset so
 285          * that it can clean up anything it needs to.
 286          */
 287         void (*notify_qp_reset)(struct rvt_qp *qp);
 288
 289         /*
 290          * Get a path mtu from the driver based on qp attributes.
 291          */
 292         int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 293                                   struct ib_qp_attr *attr);
 294
 295         /*
 296          * Notify driver that it needs to flush any outstanding IO requests that
 297          * are waiting on a qp.
 298          */
 299         void (*flush_qp_waiters)(struct rvt_qp *qp);
 300
 301         /*
 302          * Notify driver to stop its queue of sending packets. Nothing else
 303          * should be posted to the queue pair after this has been called.
 304          */
 305         void (*stop_send_queue)(struct rvt_qp *qp);
 306
 307         /*
 308          * Have the drivr drain any in progress operations
 309          */
 310         void (*quiesce_qp)(struct rvt_qp *qp);
 311
 312         /*
 313          * Inform the driver a qp has went to error state.
 314          */
 315         void (*notify_error_qp)(struct rvt_qp *qp);
 316
 317         /*
 318          * Get an MTU for a qp.
 319          */
 320         u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
 321                            u32 pmtu);
 322         /*
 323          * Convert an mtu to a path mtu
 324          */
 325         int (*mtu_to_path_mtu)(u32 mtu);
 326
 327         /*
 328          * Get the guid of a port in big endian byte order
 329          */
 330         int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
 331                            int guid_index, __be64 *guid);
 332
 333         /*
 334          * Query driver for the state of the port.
 335          */
 336         int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num,
 337                                 struct ib_port_attr *props);
 338
 339         /*
 340          * Tell driver to shutdown a port
 341          */
 342         int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);
 343
 344         /* Tell driver to send a trap for changed  port capabilities */
 345         void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num);
 346
 347         /*
 348          * The following functions can be safely ignored completely. Any use of
 349          * these is checked for NULL before blindly calling. Rdmavt should also
 350          * be functional if drivers omit these.
 351          */
 352
 353         /* Called to inform the driver that all qps should now be freed. */
 354         unsigned (*free_all_qps)(struct rvt_dev_info *rdi);
 355
 356         /* Driver specific AH validation */
 357         int (*check_ah)(struct ib_device *, struct rdma_ah_attr *);
 358
 359         /* Inform the driver a new AH has been created */
 360         void (*notify_new_ah)(struct ib_device *, struct rdma_ah_attr *,
 361                               struct rvt_ah *);
 362
 363         /* Let the driver pick the next queue pair number*/
 364         int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
 365                          enum ib_qp_type type, u8 port_num);
 366
 367         /* Determine if its safe or allowed to modify the qp */
 368         int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
 369                                int attr_mask, struct ib_udata *udata);
 370
 371         /* Driver specific QP modification/notification-of */
 372         void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
 373                           int attr_mask, struct ib_udata *udata);
 374
 375         /* Notify driver a mad agent has been created */
 376         void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
 377
 378         /* Notify driver a mad agent has been removed */
 379         void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
 380
 381         /* Notify driver to restart rc */
 382         void (*notify_restart_rc)(struct rvt_qp *qp, u32 psn, int wait);
 383
 384         /* Get and return CPU to pin CQ processing thread */
 385         int (*comp_vect_cpu_lookup)(struct rvt_dev_info *rdi, int comp_vect);
 386 };
 387
 388 struct rvt_dev_info {
 389         struct ib_device ibdev; /* Keep this first. Nothing above here */
 390
 391         /*
 392          * Prior to calling for registration the driver will be responsible for
 393          * allocating space for this structure.
 394          *
 395          * The driver will also be responsible for filling in certain members of
 396          * dparms.props. The driver needs to fill in dparms exactly as it would
 397          * want values reported to a ULP. This will be returned to the caller
 398          * in rdmavt's device. The driver should also therefore refrain from
 399          * modifying this directly after registration with rdmavt.
 400          */
 401
 402         /* Driver specific properties */
 403         struct rvt_driver_params dparms;
 404
 405         /* post send table */
 406         const struct rvt_operation_params *post_parms;
 407
 408         /* opcode translation table */
 409         const enum ib_wc_opcode *wc_opcode;
 410
 411         /* Driver specific helper functions */
 412         struct rvt_driver_provided driver_f;
 413
 414         struct rvt_mregion __rcu *dma_mr;
 415         struct rvt_lkey_table lkey_table;
 416
 417         /* Internal use */
 418         int n_pds_allocated;
 419         spinlock_t n_pds_lock; /* Protect pd allocated count */
 420
 421         int n_ahs_allocated;
 422         spinlock_t n_ahs_lock; /* Protect ah allocated count */
 423
 424         u32 n_srqs_allocated;
 425         spinlock_t n_srqs_lock; /* Protect srqs allocated count */
 426
 427         int flags;
 428         struct rvt_ibport **ports;
 429
 430         /* QP */
 431         struct rvt_qp_ibdev *qp_dev;
 432         u32 n_qps_allocated;    /* number of QPs allocated for device */
 433         u32 n_rc_qps;           /* number of RC QPs allocated for device */
 434         u32 busy_jiffies;       /* timeout scaling based on RC QP count */
 435         spinlock_t n_qps_lock;  /* protect qps, rc qps and busy jiffy counts */
 436
 437         /* memory maps */
 438         struct list_head pending_mmaps;
 439         spinlock_t mmap_offset_lock; /* protect mmap_offset */
 440         u32 mmap_offset;
 441         spinlock_t pending_lock; /* protect pending mmap list */
 442
 443         /* CQ */
 444         u32 n_cqs_allocated;    /* number of CQs allocated for device */
 445         spinlock_t n_cqs_lock; /* protect count of in use cqs */
 446
 447         /* Multicast */
 448         u32 n_mcast_grps_allocated; /* number of mcast groups allocated */
 449         spinlock_t n_mcast_grps_lock;
 450
 451         /* Memory Working Set Size */
 452         struct rvt_wss *wss;
 453 };
 454
 455 /**
 456  * rvt_set_ibdev_name - Craft an IB device name from client info
 457  * @rdi: pointer to the client rvt_dev_info structure
 458  * @name: client specific name
 459  * @unit: client specific unit number.
 460  */
 461 static inline void rvt_set_ibdev_name(struct rvt_dev_info *rdi,
 462                                       const char *fmt, const char *name,
 463                                       const int unit)
 464 {
 465         /*
 466          * FIXME: rvt and its users want to touch the ibdev before
 467          * registration and have things like the name work. We don't have the
 468          * infrastructure in the core to support this directly today, hack it
 469          * to work by setting the name manually here.
 470          */
 471         dev_set_name(&rdi->ibdev.dev, fmt, name, unit);
 472         strlcpy(rdi->ibdev.name, dev_name(&rdi->ibdev.dev), IB_DEVICE_NAME_MAX);
 473 }
 474
 475 /**
 476  * rvt_get_ibdev_name - return the IB name
 477  * @rdi: rdmavt device
 478  *
 479  * Return the registered name of the device.
 480  */
 481 static inline const char *rvt_get_ibdev_name(const struct rvt_dev_info *rdi)
 482 {
 483         return dev_name(&rdi->ibdev.dev);
 484 }
 485
 486 static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
 487 {
 488         return container_of(ibpd, struct rvt_pd, ibpd);
 489 }
 490
 491 static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
 492 {
 493         return container_of(ibah, struct rvt_ah, ibah);
 494 }
 495
 496 static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
 497 {
 498         return  container_of(ibdev, struct rvt_dev_info, ibdev);
 499 }
 500
 501 static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
 502 {
 503         return container_of(ibsrq, struct rvt_srq, ibsrq);
 504 }
 505
 506 static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
 507 {
 508         return container_of(ibqp, struct rvt_qp, ibqp);
 509 }
 510
 511 static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
 512 {
 513         /*
 514          * All ports have same number of pkeys.
 515          */
 516         return rdi->dparms.npkeys;
 517 }
 518
 519 /*
 520  * Return the max atomic suitable for determining
 521  * the size of the ack ring buffer in a QP.
 522  */
 523 static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi)
 524 {
 525         return rdi->dparms.max_rdma_atomic + 1;
 526 }
 527
 528 /*
 529  * Return the indexed PKEY from the port PKEY table.
 530  */
 531 static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi,
 532                                int port_index,
 533                                unsigned index)
 534 {
 535         if (index >= rvt_get_npkeys(rdi))
 536                 return 0;
 537         else
 538                 return rdi->ports[port_index]->pkey_table[index];
 539 }
 540
 541 /**
 542  * rvt_lookup_qpn - return the QP with the given QPN
 543  * @ibp: the ibport
 544  * @qpn: the QP number to look up
 545  *
 546  * The caller must hold the rcu_read_lock(), and keep the lock until
 547  * the returned qp is no longer in use.
 548  */
 549 /* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */
 550 static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
 551                                             struct rvt_ibport *rvp,
 552                                             u32 qpn) __must_hold(RCU)
 553 {
 554         struct rvt_qp *qp = NULL;
 555
 556         if (unlikely(qpn <= 1)) {
 557                 qp = rcu_dereference(rvp->qp[qpn]);
 558         } else {
 559                 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);
 560
 561                 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
 562                         qp = rcu_dereference(qp->next))
 563                         if (qp->ibqp.qp_num == qpn)
 564                                 break;
 565         }
 566         return qp;
 567 }
 568
 569 /**
 570  * rvt_mod_retry_timer - mod a retry timer
 571  * @qp - the QP
 572  * Modify a potentially already running retry timer
 573  */
 574 static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
 575 {
 576         struct ib_qp *ibqp = &qp->ibqp;
 577         struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
 578
 579         lockdep_assert_held(&qp->s_lock);
 580         qp->s_flags |= RVT_S_TIMER;
 581         /* 4.096 usec. * (1 << qp->timeout) */
 582         mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies +
 583                   rdi->busy_jiffies);
 584 }
 585
 586 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
 587 void rvt_dealloc_device(struct rvt_dev_info *rdi);
 588 int rvt_register_device(struct rvt_dev_info *rvd, u32 driver_id);
 589 void rvt_unregister_device(struct rvt_dev_info *rvd);
 590 int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
 591 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
 592                   int port_index, u16 *pkey_table);
 593 int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
 594                     int access);
 595 int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey);
 596 int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
 597                 u32 len, u64 vaddr, u32 rkey, int acc);
 598 int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
 599                 struct rvt_sge *isge, struct rvt_sge *last_sge,
 600                 struct ib_sge *sge, int acc);
 601 struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
 602                                  u16 lid);
 603
 604 #endif          /* DEF_RDMA_VT_H */