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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
52 * Structure that low level drivers will populate in order to register with the
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>
64 #define RVT_MAX_PKEY_VALUES 16
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 */
72 struct list_head list;
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 */
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 */
90 u32 pma_sample_interval;
91 __be16 pma_counter_select[5];
93 u16 mkey_lease_period;
101 * Driver is expected to keep these up to date. These
102 * counters are informational only and not required to be
103 * completely accurate.
122 /* Hot-path per CPU counters to avoid cacheline trading to update */
125 u64 z_rc_delayed_comp;
126 u64 __percpu *rc_acks;
127 u64 __percpu *rc_qacks;
128 u64 __percpu *rc_delayed_comp;
130 void *priv; /* driver private data */
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.
140 struct rvt_ah *sm_ah;
143 * Keep a list of traps that have not been repressed. They will be
144 * resent based on trap_timer.
146 struct trap_list trap_lists[RVT_MAX_TRAP_LISTS];
147 struct timer_list trap_timer;
150 #define RVT_CQN_MAX 16 /* maximum length of cq name */
152 #define RVT_SGE_COPY_MEMCPY 0
153 #define RVT_SGE_COPY_CACHELESS 1
154 #define RVT_SGE_COPY_ADAPTIVE 2
157 * Things that are driver specific, module parameters in hfi1 and qib
159 struct rvt_driver_params {
160 struct ib_device_attr props;
163 * Anything driver specific that is not covered by props
164 * For instance special module parameters. Goes here.
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;
185 u8 extra_rdma_atomic;
186 u8 reserved_operations;
190 struct rvt_ucontext {
191 struct ib_ucontext ibucontext;
194 /* Protection domain */
203 struct rdma_ah_attr attr;
209 /* memory working set size */
211 unsigned long *entries;
212 atomic_t total_count;
213 atomic_t clean_counter;
214 atomic_t clean_entry;
219 unsigned int clean_period;
224 struct rvt_driver_provided {
226 * Which functions are required depends on which verbs rdmavt is
227 * providing and which verbs the driver is overriding. See
228 * check_support() for details.
231 /* hot path calldowns in a single cacheline */
234 * Give the driver a notice that there is send work to do. It is up to
235 * the driver to generally push the packets out, this just queues the
236 * work with the driver. There are two variants here. The no_lock
237 * version requires the s_lock not to be held. The other assumes the
240 bool (*schedule_send)(struct rvt_qp *qp);
241 bool (*schedule_send_no_lock)(struct rvt_qp *qp);
244 * Driver specific work request setup and checking.
245 * This function is allowed to perform any setup, checks, or
246 * adjustments required to the SWQE in order to be usable by
247 * underlying protocols. This includes private data structure
250 int (*setup_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe,
254 * Sometimes rdmavt needs to kick the driver's send progress. That is
255 * done by this call back.
257 void (*do_send)(struct rvt_qp *qp);
260 * Returns a pointer to the undelying hardware's PCI device. This is
261 * used to display information as to what hardware is being referenced
262 * in an output message
264 struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
267 * Allocate a private queue pair data structure for driver specific
268 * information which is opaque to rdmavt. Errors are returned via
269 * ERR_PTR(err). The driver is free to return NULL or a valid
272 void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
275 * Init a struture allocated with qp_priv_alloc(). This should be
276 * called after all qp fields have been initialized in rdmavt.
278 int (*qp_priv_init)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
279 struct ib_qp_init_attr *init_attr);
282 * Free the driver's private qp structure.
284 void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
287 * Inform the driver the particular qp in quesiton has been reset so
288 * that it can clean up anything it needs to.
290 void (*notify_qp_reset)(struct rvt_qp *qp);
293 * Get a path mtu from the driver based on qp attributes.
295 int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
296 struct ib_qp_attr *attr);
299 * Notify driver that it needs to flush any outstanding IO requests that
300 * are waiting on a qp.
302 void (*flush_qp_waiters)(struct rvt_qp *qp);
305 * Notify driver to stop its queue of sending packets. Nothing else
306 * should be posted to the queue pair after this has been called.
308 void (*stop_send_queue)(struct rvt_qp *qp);
311 * Have the drivr drain any in progress operations
313 void (*quiesce_qp)(struct rvt_qp *qp);
316 * Inform the driver a qp has went to error state.
318 void (*notify_error_qp)(struct rvt_qp *qp);
321 * Get an MTU for a qp.
323 u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
326 * Convert an mtu to a path mtu
328 int (*mtu_to_path_mtu)(u32 mtu);
331 * Get the guid of a port in big endian byte order
333 int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
334 int guid_index, __be64 *guid);
337 * Query driver for the state of the port.
339 int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num,
340 struct ib_port_attr *props);
343 * Tell driver to shutdown a port
345 int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);
347 /* Tell driver to send a trap for changed port capabilities */
348 void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num);
351 * The following functions can be safely ignored completely. Any use of
352 * these is checked for NULL before blindly calling. Rdmavt should also
353 * be functional if drivers omit these.
356 /* Called to inform the driver that all qps should now be freed. */
357 unsigned (*free_all_qps)(struct rvt_dev_info *rdi);
359 /* Driver specific AH validation */
360 int (*check_ah)(struct ib_device *, struct rdma_ah_attr *);
362 /* Inform the driver a new AH has been created */
363 void (*notify_new_ah)(struct ib_device *, struct rdma_ah_attr *,
366 /* Let the driver pick the next queue pair number*/
367 int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
368 enum ib_qp_type type, u8 port_num);
370 /* Determine if its safe or allowed to modify the qp */
371 int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
372 int attr_mask, struct ib_udata *udata);
374 /* Driver specific QP modification/notification-of */
375 void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
376 int attr_mask, struct ib_udata *udata);
378 /* Notify driver a mad agent has been created */
379 void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
381 /* Notify driver a mad agent has been removed */
382 void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
384 /* Notify driver to restart rc */
385 void (*notify_restart_rc)(struct rvt_qp *qp, u32 psn, int wait);
387 /* Get and return CPU to pin CQ processing thread */
388 int (*comp_vect_cpu_lookup)(struct rvt_dev_info *rdi, int comp_vect);
391 struct rvt_dev_info {
392 struct ib_device ibdev; /* Keep this first. Nothing above here */
395 * Prior to calling for registration the driver will be responsible for
396 * allocating space for this structure.
398 * The driver will also be responsible for filling in certain members of
399 * dparms.props. The driver needs to fill in dparms exactly as it would
400 * want values reported to a ULP. This will be returned to the caller
401 * in rdmavt's device. The driver should also therefore refrain from
402 * modifying this directly after registration with rdmavt.
405 /* Driver specific properties */
406 struct rvt_driver_params dparms;
408 /* post send table */
409 const struct rvt_operation_params *post_parms;
411 /* opcode translation table */
412 const enum ib_wc_opcode *wc_opcode;
414 /* Driver specific helper functions */
415 struct rvt_driver_provided driver_f;
417 struct rvt_mregion __rcu *dma_mr;
418 struct rvt_lkey_table lkey_table;
422 spinlock_t n_pds_lock; /* Protect pd allocated count */
425 spinlock_t n_ahs_lock; /* Protect ah allocated count */
427 u32 n_srqs_allocated;
428 spinlock_t n_srqs_lock; /* Protect srqs allocated count */
431 struct rvt_ibport **ports;
434 struct rvt_qp_ibdev *qp_dev;
435 u32 n_qps_allocated; /* number of QPs allocated for device */
436 u32 n_rc_qps; /* number of RC QPs allocated for device */
437 u32 busy_jiffies; /* timeout scaling based on RC QP count */
438 spinlock_t n_qps_lock; /* protect qps, rc qps and busy jiffy counts */
441 struct list_head pending_mmaps;
442 spinlock_t mmap_offset_lock; /* protect mmap_offset */
444 spinlock_t pending_lock; /* protect pending mmap list */
447 u32 n_cqs_allocated; /* number of CQs allocated for device */
448 spinlock_t n_cqs_lock; /* protect count of in use cqs */
451 u32 n_mcast_grps_allocated; /* number of mcast groups allocated */
452 spinlock_t n_mcast_grps_lock;
454 /* Memory Working Set Size */
459 * rvt_set_ibdev_name - Craft an IB device name from client info
460 * @rdi: pointer to the client rvt_dev_info structure
461 * @name: client specific name
462 * @unit: client specific unit number.
464 static inline void rvt_set_ibdev_name(struct rvt_dev_info *rdi,
465 const char *fmt, const char *name,
469 * FIXME: rvt and its users want to touch the ibdev before
470 * registration and have things like the name work. We don't have the
471 * infrastructure in the core to support this directly today, hack it
472 * to work by setting the name manually here.
474 dev_set_name(&rdi->ibdev.dev, fmt, name, unit);
475 strlcpy(rdi->ibdev.name, dev_name(&rdi->ibdev.dev), IB_DEVICE_NAME_MAX);
479 * rvt_get_ibdev_name - return the IB name
480 * @rdi: rdmavt device
482 * Return the registered name of the device.
484 static inline const char *rvt_get_ibdev_name(const struct rvt_dev_info *rdi)
486 return dev_name(&rdi->ibdev.dev);
489 static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
491 return container_of(ibpd, struct rvt_pd, ibpd);
494 static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
496 return container_of(ibah, struct rvt_ah, ibah);
499 static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
501 return container_of(ibdev, struct rvt_dev_info, ibdev);
504 static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
506 return container_of(ibsrq, struct rvt_srq, ibsrq);
509 static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
511 return container_of(ibqp, struct rvt_qp, ibqp);
514 static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
517 * All ports have same number of pkeys.
519 return rdi->dparms.npkeys;
523 * Return the max atomic suitable for determining
524 * the size of the ack ring buffer in a QP.
526 static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi)
528 return rdi->dparms.max_rdma_atomic +
529 rdi->dparms.extra_rdma_atomic + 1;
532 static inline unsigned int rvt_size_atomic(struct rvt_dev_info *rdi)
534 return rdi->dparms.max_rdma_atomic +
535 rdi->dparms.extra_rdma_atomic;
539 * Return the indexed PKEY from the port PKEY table.
541 static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi,
545 if (index >= rvt_get_npkeys(rdi))
548 return rdi->ports[port_index]->pkey_table[index];
552 * rvt_lookup_qpn - return the QP with the given QPN
554 * @qpn: the QP number to look up
556 * The caller must hold the rcu_read_lock(), and keep the lock until
557 * the returned qp is no longer in use.
559 /* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */
560 static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
561 struct rvt_ibport *rvp,
562 u32 qpn) __must_hold(RCU)
564 struct rvt_qp *qp = NULL;
566 if (unlikely(qpn <= 1)) {
567 qp = rcu_dereference(rvp->qp[qpn]);
569 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);
571 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
572 qp = rcu_dereference(qp->next))
573 if (qp->ibqp.qp_num == qpn)
580 * rvt_mod_retry_timer - mod a retry timer
582 * @shift - timeout shift to wait for multiple packets
583 * Modify a potentially already running retry timer
585 static inline void rvt_mod_retry_timer_ext(struct rvt_qp *qp, u8 shift)
587 struct ib_qp *ibqp = &qp->ibqp;
588 struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
590 lockdep_assert_held(&qp->s_lock);
591 qp->s_flags |= RVT_S_TIMER;
592 /* 4.096 usec. * (1 << qp->timeout) */
593 mod_timer(&qp->s_timer, jiffies + rdi->busy_jiffies +
594 (qp->timeout_jiffies << shift));
597 static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
599 return rvt_mod_retry_timer_ext(qp, 0);
602 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
603 void rvt_dealloc_device(struct rvt_dev_info *rdi);
604 int rvt_register_device(struct rvt_dev_info *rvd, u32 driver_id);
605 void rvt_unregister_device(struct rvt_dev_info *rvd);
606 int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
607 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
608 int port_index, u16 *pkey_table);
609 int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
611 int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey);
612 int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
613 u32 len, u64 vaddr, u32 rkey, int acc);
614 int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
615 struct rvt_sge *isge, struct rvt_sge *last_sge,
616 struct ib_sge *sge, int acc);
617 struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
620 #endif /* DEF_RDMA_VT_H */