1#ifndef DEF_RDMA_VT_H 2#define DEF_RDMA_VT_H 3 4/*- 5 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 6 * 7 * Copyright(c) 2016 Intel Corporation. 8 * 9 * This file is provided under a dual BSD/GPLv2 license. When using or 10 * redistributing this file, you may do so under either license. 11 * 12 * GPL LICENSE SUMMARY 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of version 2 of the GNU General Public License as 16 * published by the Free Software Foundation. 17 * 18 * This program is distributed in the hope that it will be useful, but 19 * WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 * General Public License for more details. 22 * 23 * BSD LICENSE 24 * 25 * Redistribution and use in source and binary forms, with or without 26 * modification, are permitted provided that the following conditions 27 * are met: 28 * 29 * - Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * - Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in 33 * the documentation and/or other materials provided with the 34 * distribution. 35 * - Neither the name of Intel Corporation nor the names of its 36 * contributors may be used to endorse or promote products derived 37 * from this software without specific prior written permission. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 40 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 41 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 42 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 43 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 46 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 47 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 48 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 49 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 50 */ 51 52/* 53 * Structure that low level drivers will populate in order to register with the 54 * rdmavt layer. 55 */ 56 57#include <linux/spinlock.h> 58#include <linux/list.h> 59#include <linux/hash.h> 60#include <rdma/ib_verbs.h> 61#include <rdma/rdmavt_mr.h> 62#include <rdma/rdmavt_qp.h> 63 64#define RVT_MAX_PKEY_VALUES 16 65 66struct rvt_ibport { 67 struct rvt_qp __rcu *qp[2]; 68 struct ib_mad_agent *send_agent; /* agent for SMI (traps) */ 69 struct rb_root mcast_tree; 70 spinlock_t lock; /* protect changes in this struct */ 71 72 /* non-zero when timer is set */ 73 unsigned long mkey_lease_timeout; 74 unsigned long trap_timeout; 75 __be64 gid_prefix; /* in network order */ 76 __be64 mkey; 77 u64 tid; 78 u32 port_cap_flags; 79 u32 pma_sample_start; 80 u32 pma_sample_interval; 81 __be16 pma_counter_select[5]; 82 u16 pma_tag; 83 u16 mkey_lease_period; 84 u16 sm_lid; 85 u8 sm_sl; 86 u8 mkeyprot; 87 u8 subnet_timeout; 88 u8 vl_high_limit; 89 90 /* 91 * Driver is expected to keep these up to date. These 92 * counters are informational only and not required to be 93 * completely accurate. 94 */ 95 u64 n_rc_resends; 96 u64 n_seq_naks; 97 u64 n_rdma_seq; 98 u64 n_rnr_naks; 99 u64 n_other_naks; 100 u64 n_loop_pkts; 101 u64 n_pkt_drops; 102 u64 n_vl15_dropped; 103 u64 n_rc_timeouts; 104 u64 n_dmawait; 105 u64 n_unaligned; 106 u64 n_rc_dupreq; 107 u64 n_rc_seqnak; 108 u16 pkey_violations; 109 u16 qkey_violations; 110 u16 mkey_violations; 111 112 /* Hot-path per CPU counters to avoid cacheline trading to update */ 113 u64 z_rc_acks; 114 u64 z_rc_qacks; 115 u64 z_rc_delayed_comp; 116 u64 __percpu *rc_acks; 117 u64 __percpu *rc_qacks; 118 u64 __percpu *rc_delayed_comp; 119 120 void *priv; /* driver private data */ 121 122 /* 123 * The pkey table is allocated and maintained by the driver. Drivers 124 * need to have access to this before registering with rdmav. However 125 * rdmavt will need access to it so drivers need to proviee this during 126 * the attach port API call. 127 */ 128 u16 *pkey_table; 129 130 struct rvt_ah *sm_ah; 131}; 132 133#define RVT_CQN_MAX 16 /* maximum length of cq name */ 134 135/* 136 * Things that are driver specific, module parameters in hfi1 and qib 137 */ 138struct rvt_driver_params { 139 struct ib_device_attr props; 140 141 /* 142 * Anything driver specific that is not covered by props 143 * For instance special module parameters. Goes here. 144 */ 145 unsigned int lkey_table_size; 146 unsigned int qp_table_size; 147 int qpn_start; 148 int qpn_inc; 149 int qpn_res_start; 150 int qpn_res_end; 151 int nports; 152 int npkeys; 153 char cq_name[RVT_CQN_MAX]; 154 int node; 155 int psn_mask; 156 int psn_shift; 157 int psn_modify_mask; 158 u32 core_cap_flags; 159 u32 max_mad_size; 160 u8 qos_shift; 161 u8 max_rdma_atomic; 162 u8 reserved_operations; 163}; 164 165/* Protection domain */ 166struct rvt_pd { 167 struct ib_pd ibpd; 168 int user; /* non-zero if created from user space */ 169}; 170 171/* Address handle */ 172struct rvt_ah { 173 struct ib_ah ibah; 174 struct ib_ah_attr attr; 175 atomic_t refcount; 176 u8 vl; 177 u8 log_pmtu; 178}; 179 180struct rvt_dev_info; 181struct rvt_swqe; 182struct rvt_driver_provided { 183 /* 184 * Which functions are required depends on which verbs rdmavt is 185 * providing and which verbs the driver is overriding. See 186 * check_support() for details. 187 */ 188 189 /* Passed to ib core registration. Callback to create syfs files */ 190 int (*port_callback)(struct ib_device *, u8, struct kobject *); 191 192 /* 193 * Returns a string to represent the device for which is being 194 * registered. This is primarily used for error and debug messages on 195 * the console. 196 */ 197 const char * (*get_card_name)(struct rvt_dev_info *rdi); 198 199 /* 200 * Returns a pointer to the undelying hardware's PCI device. This is 201 * used to display information as to what hardware is being referenced 202 * in an output message 203 */ 204 struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi); 205 206 /* 207 * Allocate a private queue pair data structure for driver specific 208 * information which is opaque to rdmavt. Errors are returned via 209 * ERR_PTR(err). The driver is free to return NULL or a valid 210 * pointer. 211 */ 212 void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp, 213 gfp_t gfp); 214 215 /* 216 * Free the driver's private qp structure. 217 */ 218 void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp); 219 220 /* 221 * Inform the driver the particular qp in quesiton has been reset so 222 * that it can clean up anything it needs to. 223 */ 224 void (*notify_qp_reset)(struct rvt_qp *qp); 225 226 /* 227 * Give the driver a notice that there is send work to do. It is up to 228 * the driver to generally push the packets out, this just queues the 229 * work with the driver. There are two variants here. The no_lock 230 * version requires the s_lock not to be held. The other assumes the 231 * s_lock is held. 232 */ 233 void (*schedule_send)(struct rvt_qp *qp); 234 void (*schedule_send_no_lock)(struct rvt_qp *qp); 235 236 /* 237 * Sometimes rdmavt needs to kick the driver's send progress. That is 238 * done by this call back. 239 */ 240 void (*do_send)(struct rvt_qp *qp); 241 242 /* 243 * Get a path mtu from the driver based on qp attributes. 244 */ 245 int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp, 246 struct ib_qp_attr *attr); 247 248 /* 249 * Notify driver that it needs to flush any outstanding IO requests that 250 * are waiting on a qp. 251 */ 252 void (*flush_qp_waiters)(struct rvt_qp *qp); 253 254 /* 255 * Notify driver to stop its queue of sending packets. Nothing else 256 * should be posted to the queue pair after this has been called. 257 */ 258 void (*stop_send_queue)(struct rvt_qp *qp); 259 260 /* 261 * Have the drivr drain any in progress operations 262 */ 263 void (*quiesce_qp)(struct rvt_qp *qp); 264 265 /* 266 * Inform the driver a qp has went to error state. 267 */ 268 void (*notify_error_qp)(struct rvt_qp *qp); 269 270 /* 271 * Get an MTU for a qp. 272 */ 273 u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp, 274 u32 pmtu); 275 /* 276 * Convert an mtu to a path mtu 277 */ 278 int (*mtu_to_path_mtu)(u32 mtu); 279 280 /* 281 * Get the guid of a port in big endian byte order 282 */ 283 int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp, 284 int guid_index, __be64 *guid); 285 286 /* 287 * Query driver for the state of the port. 288 */ 289 int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num, 290 struct ib_port_attr *props); 291 292 /* 293 * Tell driver to shutdown a port 294 */ 295 int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num); 296 297 /* Tell driver to send a trap for changed port capabilities */ 298 void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num); 299 300 /* 301 * The following functions can be safely ignored completely. Any use of 302 * these is checked for NULL before blindly calling. Rdmavt should also 303 * be functional if drivers omit these. 304 */ 305 306 /* Called to inform the driver that all qps should now be freed. */ 307 unsigned (*free_all_qps)(struct rvt_dev_info *rdi); 308 309 /* Driver specific AH validation */ 310 int (*check_ah)(struct ib_device *, struct ib_ah_attr *); 311 312 /* Inform the driver a new AH has been created */ 313 void (*notify_new_ah)(struct ib_device *, struct ib_ah_attr *, 314 struct rvt_ah *); 315 316 /* Let the driver pick the next queue pair number*/ 317 int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt, 318 enum ib_qp_type type, u8 port_num, gfp_t gfp); 319 320 /* Determine if its safe or allowed to modify the qp */ 321 int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr, 322 int attr_mask, struct ib_udata *udata); 323 324 /* Driver specific QP modification/notification-of */ 325 void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr, 326 int attr_mask, struct ib_udata *udata); 327 328 /* Driver specific work request checking */ 329 int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe); 330 331 /* Notify driver a mad agent has been created */ 332 void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx); 333 334 /* Notify driver a mad agent has been removed */ 335 void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx); 336 337}; 338 339struct rvt_dev_info { 340 struct ib_device ibdev; /* Keep this first. Nothing above here */ 341 342 /* 343 * Prior to calling for registration the driver will be responsible for 344 * allocating space for this structure. 345 * 346 * The driver will also be responsible for filling in certain members of 347 * dparms.props. The driver needs to fill in dparms exactly as it would 348 * want values reported to a ULP. This will be returned to the caller 349 * in rdmavt's device. The driver should also therefore refrain from 350 * modifying this directly after registration with rdmavt. 351 */ 352 353 /* Driver specific properties */ 354 struct rvt_driver_params dparms; 355 356 /* post send table */ 357 const struct rvt_operation_params *post_parms; 358 359 struct rvt_mregion __rcu *dma_mr; 360 struct rvt_lkey_table lkey_table; 361 362 /* Driver specific helper functions */ 363 struct rvt_driver_provided driver_f; 364 365 /* Internal use */ 366 int n_pds_allocated; 367 spinlock_t n_pds_lock; /* Protect pd allocated count */ 368 369 int n_ahs_allocated; 370 spinlock_t n_ahs_lock; /* Protect ah allocated count */ 371 372 u32 n_srqs_allocated; 373 spinlock_t n_srqs_lock; /* Protect srqs allocated count */ 374 375 int flags; 376 struct rvt_ibport **ports; 377 378 /* QP */ 379 struct rvt_qp_ibdev *qp_dev; 380 u32 n_qps_allocated; /* number of QPs allocated for device */ 381 u32 n_rc_qps; /* number of RC QPs allocated for device */ 382 u32 busy_jiffies; /* timeout scaling based on RC QP count */ 383 spinlock_t n_qps_lock; /* protect qps, rc qps and busy jiffy counts */ 384 385 /* memory maps */ 386 struct list_head pending_mmaps; 387 spinlock_t mmap_offset_lock; /* protect mmap_offset */ 388 u32 mmap_offset; 389 spinlock_t pending_lock; /* protect pending mmap list */ 390 391 /* CQ */ 392 struct kthread_worker *worker; /* per device cq worker */ 393 u32 n_cqs_allocated; /* number of CQs allocated for device */ 394 spinlock_t n_cqs_lock; /* protect count of in use cqs */ 395 396 /* Multicast */ 397 u32 n_mcast_grps_allocated; /* number of mcast groups allocated */ 398 spinlock_t n_mcast_grps_lock; 399 400}; 401 402static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd) 403{ 404 return container_of(ibpd, struct rvt_pd, ibpd); 405} 406 407static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah) 408{ 409 return container_of(ibah, struct rvt_ah, ibah); 410} 411 412static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev) 413{ 414 return container_of(ibdev, struct rvt_dev_info, ibdev); 415} 416 417static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq) 418{ 419 return container_of(ibsrq, struct rvt_srq, ibsrq); 420} 421 422static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp) 423{ 424 return container_of(ibqp, struct rvt_qp, ibqp); 425} 426 427static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi) 428{ 429 /* 430 * All ports have same number of pkeys. 431 */ 432 return rdi->dparms.npkeys; 433} 434 435/* 436 * Return the max atomic suitable for determining 437 * the size of the ack ring buffer in a QP. 438 */ 439static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi) 440{ 441 return rdi->dparms.max_rdma_atomic + 1; 442} 443 444/* 445 * Return the indexed PKEY from the port PKEY table. 446 */ 447static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi, 448 int port_index, 449 unsigned index) 450{ 451 if (index >= rvt_get_npkeys(rdi)) 452 return 0; 453 else 454 return rdi->ports[port_index]->pkey_table[index]; 455} 456 457/** 458 * rvt_lookup_qpn - return the QP with the given QPN 459 * @ibp: the ibport 460 * @qpn: the QP number to look up 461 * 462 * The caller must hold the rcu_read_lock(), and keep the lock until 463 * the returned qp is no longer in use. 464 */ 465/* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */ 466static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi, 467 struct rvt_ibport *rvp, 468 u32 qpn) __must_hold(RCU) 469{ 470 struct rvt_qp *qp = NULL; 471 472 if (unlikely(qpn <= 1)) { 473 qp = rcu_dereference(rvp->qp[qpn]); 474 } else { 475 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits); 476 477 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp; 478 qp = rcu_dereference(qp->next)) 479 if (qp->ibqp.qp_num == qpn) 480 break; 481 } 482 return qp; 483} 484 485struct rvt_dev_info *rvt_alloc_device(size_t size, int nports); 486void rvt_dealloc_device(struct rvt_dev_info *rdi); 487int rvt_register_device(struct rvt_dev_info *rvd); 488void rvt_unregister_device(struct rvt_dev_info *rvd); 489int rvt_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr); 490int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port, 491 int port_index, u16 *pkey_table); 492int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key, 493 int access); 494int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey); 495int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge, 496 u32 len, u64 vaddr, u32 rkey, int acc); 497int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, 498 struct rvt_sge *isge, struct ib_sge *sge, int acc); 499struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid); 500 501#endif /* DEF_RDMA_VT_H */ 502