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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 */
153 * Things that are driver specific, module parameters in hfi1 and qib
155 struct rvt_driver_params {
156 struct ib_device_attr props;
159 * Anything driver specific that is not covered by props
160 * For instance special module parameters. Goes here.
162 unsigned int lkey_table_size;
163 unsigned int qp_table_size;
178 u8 reserved_operations;
181 /* Protection domain */
190 struct rdma_ah_attr attr;
198 struct rvt_driver_provided {
200 * Which functions are required depends on which verbs rdmavt is
201 * providing and which verbs the driver is overriding. See
202 * check_support() for details.
205 /* hot path calldowns in a single cacheline */
208 * Give the driver a notice that there is send work to do. It is up to
209 * the driver to generally push the packets out, this just queues the
210 * work with the driver. There are two variants here. The no_lock
211 * version requires the s_lock not to be held. The other assumes the
214 void (*schedule_send)(struct rvt_qp *qp);
215 void (*schedule_send_no_lock)(struct rvt_qp *qp);
217 /* Driver specific work request checking */
218 int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe);
221 * Sometimes rdmavt needs to kick the driver's send progress. That is
222 * done by this call back.
224 void (*do_send)(struct rvt_qp *qp);
226 /* Passed to ib core registration. Callback to create syfs files */
227 int (*port_callback)(struct ib_device *, u8, struct kobject *);
230 * Returns a pointer to the undelying hardware's PCI device. This is
231 * used to display information as to what hardware is being referenced
232 * in an output message
234 struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
237 * Allocate a private queue pair data structure for driver specific
238 * information which is opaque to rdmavt. Errors are returned via
239 * ERR_PTR(err). The driver is free to return NULL or a valid
242 void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
245 * Free the driver's private qp structure.
247 void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
250 * Inform the driver the particular qp in quesiton has been reset so
251 * that it can clean up anything it needs to.
253 void (*notify_qp_reset)(struct rvt_qp *qp);
256 * Get a path mtu from the driver based on qp attributes.
258 int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
259 struct ib_qp_attr *attr);
262 * Notify driver that it needs to flush any outstanding IO requests that
263 * are waiting on a qp.
265 void (*flush_qp_waiters)(struct rvt_qp *qp);
268 * Notify driver to stop its queue of sending packets. Nothing else
269 * should be posted to the queue pair after this has been called.
271 void (*stop_send_queue)(struct rvt_qp *qp);
274 * Have the drivr drain any in progress operations
276 void (*quiesce_qp)(struct rvt_qp *qp);
279 * Inform the driver a qp has went to error state.
281 void (*notify_error_qp)(struct rvt_qp *qp);
284 * Get an MTU for a qp.
286 u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
289 * Convert an mtu to a path mtu
291 int (*mtu_to_path_mtu)(u32 mtu);
294 * Get the guid of a port in big endian byte order
296 int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
297 int guid_index, __be64 *guid);
300 * Query driver for the state of the port.
302 int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num,
303 struct ib_port_attr *props);
306 * Tell driver to shutdown a port
308 int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);
310 /* Tell driver to send a trap for changed port capabilities */
311 void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num);
314 * The following functions can be safely ignored completely. Any use of
315 * these is checked for NULL before blindly calling. Rdmavt should also
316 * be functional if drivers omit these.
319 /* Called to inform the driver that all qps should now be freed. */
320 unsigned (*free_all_qps)(struct rvt_dev_info *rdi);
322 /* Driver specific AH validation */
323 int (*check_ah)(struct ib_device *, struct rdma_ah_attr *);
325 /* Inform the driver a new AH has been created */
326 void (*notify_new_ah)(struct ib_device *, struct rdma_ah_attr *,
329 /* Let the driver pick the next queue pair number*/
330 int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
331 enum ib_qp_type type, u8 port_num);
333 /* Determine if its safe or allowed to modify the qp */
334 int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
335 int attr_mask, struct ib_udata *udata);
337 /* Driver specific QP modification/notification-of */
338 void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
339 int attr_mask, struct ib_udata *udata);
341 /* Notify driver a mad agent has been created */
342 void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
344 /* Notify driver a mad agent has been removed */
345 void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
347 /* Notify driver to restart rc */
348 void (*notify_restart_rc)(struct rvt_qp *qp, u32 psn, int wait);
350 /* Get and return CPU to pin CQ processing thread */
351 int (*comp_vect_cpu_lookup)(struct rvt_dev_info *rdi, int comp_vect);
354 struct rvt_dev_info {
355 struct ib_device ibdev; /* Keep this first. Nothing above here */
358 * Prior to calling for registration the driver will be responsible for
359 * allocating space for this structure.
361 * The driver will also be responsible for filling in certain members of
362 * dparms.props. The driver needs to fill in dparms exactly as it would
363 * want values reported to a ULP. This will be returned to the caller
364 * in rdmavt's device. The driver should also therefore refrain from
365 * modifying this directly after registration with rdmavt.
368 /* Driver specific properties */
369 struct rvt_driver_params dparms;
371 /* post send table */
372 const struct rvt_operation_params *post_parms;
374 /* Driver specific helper functions */
375 struct rvt_driver_provided driver_f;
377 struct rvt_mregion __rcu *dma_mr;
378 struct rvt_lkey_table lkey_table;
382 spinlock_t n_pds_lock; /* Protect pd allocated count */
385 spinlock_t n_ahs_lock; /* Protect ah allocated count */
387 u32 n_srqs_allocated;
388 spinlock_t n_srqs_lock; /* Protect srqs allocated count */
391 struct rvt_ibport **ports;
394 struct rvt_qp_ibdev *qp_dev;
395 u32 n_qps_allocated; /* number of QPs allocated for device */
396 u32 n_rc_qps; /* number of RC QPs allocated for device */
397 u32 busy_jiffies; /* timeout scaling based on RC QP count */
398 spinlock_t n_qps_lock; /* protect qps, rc qps and busy jiffy counts */
401 struct list_head pending_mmaps;
402 spinlock_t mmap_offset_lock; /* protect mmap_offset */
404 spinlock_t pending_lock; /* protect pending mmap list */
407 u32 n_cqs_allocated; /* number of CQs allocated for device */
408 spinlock_t n_cqs_lock; /* protect count of in use cqs */
411 u32 n_mcast_grps_allocated; /* number of mcast groups allocated */
412 spinlock_t n_mcast_grps_lock;
417 * rvt_set_ibdev_name - Craft an IB device name from client info
418 * @rdi: pointer to the client rvt_dev_info structure
419 * @name: client specific name
420 * @unit: client specific unit number.
422 static inline void rvt_set_ibdev_name(struct rvt_dev_info *rdi,
423 const char *fmt, const char *name,
426 snprintf(rdi->ibdev.name, sizeof(rdi->ibdev.name), fmt, name, unit);
430 * rvt_get_ibdev_name - return the IB name
431 * @rdi: rdmavt device
433 * Return the registered name of the device.
435 static inline const char *rvt_get_ibdev_name(const struct rvt_dev_info *rdi)
437 return rdi->ibdev.name;
440 static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
442 return container_of(ibpd, struct rvt_pd, ibpd);
445 static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
447 return container_of(ibah, struct rvt_ah, ibah);
450 static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
452 return container_of(ibdev, struct rvt_dev_info, ibdev);
455 static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
457 return container_of(ibsrq, struct rvt_srq, ibsrq);
460 static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
462 return container_of(ibqp, struct rvt_qp, ibqp);
465 static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
468 * All ports have same number of pkeys.
470 return rdi->dparms.npkeys;
474 * Return the max atomic suitable for determining
475 * the size of the ack ring buffer in a QP.
477 static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi)
479 return rdi->dparms.max_rdma_atomic + 1;
483 * Return the indexed PKEY from the port PKEY table.
485 static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi,
489 if (index >= rvt_get_npkeys(rdi))
492 return rdi->ports[port_index]->pkey_table[index];
496 * rvt_lookup_qpn - return the QP with the given QPN
498 * @qpn: the QP number to look up
500 * The caller must hold the rcu_read_lock(), and keep the lock until
501 * the returned qp is no longer in use.
503 /* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */
504 static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
505 struct rvt_ibport *rvp,
506 u32 qpn) __must_hold(RCU)
508 struct rvt_qp *qp = NULL;
510 if (unlikely(qpn <= 1)) {
511 qp = rcu_dereference(rvp->qp[qpn]);
513 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);
515 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
516 qp = rcu_dereference(qp->next))
517 if (qp->ibqp.qp_num == qpn)
524 * rvt_mod_retry_timer - mod a retry timer
526 * Modify a potentially already running retry timer
528 static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
530 struct ib_qp *ibqp = &qp->ibqp;
531 struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
533 lockdep_assert_held(&qp->s_lock);
534 qp->s_flags |= RVT_S_TIMER;
535 /* 4.096 usec. * (1 << qp->timeout) */
536 mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies +
540 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
541 void rvt_dealloc_device(struct rvt_dev_info *rdi);
542 int rvt_register_device(struct rvt_dev_info *rvd, u32 driver_id);
543 void rvt_unregister_device(struct rvt_dev_info *rvd);
544 int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
545 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
546 int port_index, u16 *pkey_table);
547 int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
549 int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey);
550 int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
551 u32 len, u64 vaddr, u32 rkey, int acc);
552 int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
553 struct rvt_sge *isge, struct rvt_sge *last_sge,
554 struct ib_sge *sge, int acc);
555 struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
558 #endif /* DEF_RDMA_VT_H */