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 provide 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 underlying 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 structure 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 question 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 driver 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, u32 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, u32 port_num);
319
320 /* Tell driver to send a trap for changed port capabilities */
321 void (*cap_mask_chg)(struct rvt_dev_info *rdi, u32 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, u32 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 */
rvt_set_ibdev_name(struct rvt_dev_info * rdi,const char * fmt,const char * name,const int unit)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 strscpy(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 */
rvt_get_ibdev_name(const struct rvt_dev_info * rdi)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
ibpd_to_rvtpd(struct ib_pd * ibpd)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
ibah_to_rvtah(struct ib_ah * ibah)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
ib_to_rvt(struct ib_device * ibdev)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
rvt_get_npkeys(struct rvt_dev_info * rdi)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 */
rvt_max_atomic(struct rvt_dev_info * rdi)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
rvt_size_atomic(struct rvt_dev_info * rdi)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 */
rvt_get_pkey(struct rvt_dev_info * rdi,int port_index,unsigned index)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 */
533