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13 * it under the terms of version 2 of the GNU General Public License as
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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/rdmavt_mr.h>
61 #include <rdma/rdmavt_qp.h>
63 #define RVT_MAX_PKEY_VALUES 16
66 struct rvt_qp __rcu *qp[2];
67 struct ib_mad_agent *send_agent; /* agent for SMI (traps) */
68 struct rb_root mcast_tree;
69 spinlock_t lock; /* protect changes in this struct */
71 /* non-zero when timer is set */
72 unsigned long mkey_lease_timeout;
73 unsigned long trap_timeout;
74 __be64 gid_prefix; /* in network order */
79 u32 pma_sample_interval;
80 __be16 pma_counter_select[5];
82 u16 mkey_lease_period;
90 * Driver is expected to keep these up to date. These
91 * counters are informational only and not required to be
92 * completely accurate.
111 /* Hot-path per CPU counters to avoid cacheline trading to update */
114 u64 z_rc_delayed_comp;
115 u64 __percpu *rc_acks;
116 u64 __percpu *rc_qacks;
117 u64 __percpu *rc_delayed_comp;
119 void *priv; /* driver private data */
122 * The pkey table is allocated and maintained by the driver. Drivers
123 * need to have access to this before registering with rdmav. However
124 * rdmavt will need access to it so drivers need to proviee this during
125 * the attach port API call.
129 struct rvt_ah *sm_ah;
132 #define RVT_CQN_MAX 16 /* maximum length of cq name */
135 * Things that are driver specific, module parameters in hfi1 and qib
137 struct rvt_driver_params {
138 struct ib_device_attr props;
141 * Anything driver specific that is not covered by props
142 * For instance special module parameters. Goes here.
144 unsigned int lkey_table_size;
145 unsigned int qp_table_size;
152 char cq_name[RVT_CQN_MAX];
161 u8 reserved_operations;
164 /* Protection domain */
167 int user; /* non-zero if created from user space */
173 struct ib_ah_attr attr;
181 struct rvt_driver_provided {
183 * Which functions are required depends on which verbs rdmavt is
184 * providing and which verbs the driver is overriding. See
185 * check_support() for details.
188 /* Passed to ib core registration. Callback to create syfs files */
189 int (*port_callback)(struct ib_device *, u8, struct kobject *);
192 * Returns a string to represent the device for which is being
193 * registered. This is primarily used for error and debug messages on
196 const char * (*get_card_name)(struct rvt_dev_info *rdi);
199 * Returns a pointer to the undelying hardware's PCI device. This is
200 * used to display information as to what hardware is being referenced
201 * in an output message
203 struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi);
206 * Allocate a private queue pair data structure for driver specific
207 * information which is opaque to rdmavt. Errors are returned via
208 * ERR_PTR(err). The driver is free to return NULL or a valid
211 void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
215 * Free the driver's private qp structure.
217 void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
220 * Inform the driver the particular qp in quesiton has been reset so
221 * that it can clean up anything it needs to.
223 void (*notify_qp_reset)(struct rvt_qp *qp);
226 * Give the driver a notice that there is send work to do. It is up to
227 * the driver to generally push the packets out, this just queues the
228 * work with the driver. There are two variants here. The no_lock
229 * version requires the s_lock not to be held. The other assumes the
232 void (*schedule_send)(struct rvt_qp *qp);
233 void (*schedule_send_no_lock)(struct rvt_qp *qp);
236 * Sometimes rdmavt needs to kick the driver's send progress. That is
237 * done by this call back.
239 void (*do_send)(struct rvt_qp *qp);
242 * Get a path mtu from the driver based on qp attributes.
244 int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
245 struct ib_qp_attr *attr);
248 * Notify driver that it needs to flush any outstanding IO requests that
249 * are waiting on a qp.
251 void (*flush_qp_waiters)(struct rvt_qp *qp);
254 * Notify driver to stop its queue of sending packets. Nothing else
255 * should be posted to the queue pair after this has been called.
257 void (*stop_send_queue)(struct rvt_qp *qp);
260 * Have the drivr drain any in progress operations
262 void (*quiesce_qp)(struct rvt_qp *qp);
265 * Inform the driver a qp has went to error state.
267 void (*notify_error_qp)(struct rvt_qp *qp);
270 * Get an MTU for a qp.
272 u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
275 * Convert an mtu to a path mtu
277 int (*mtu_to_path_mtu)(u32 mtu);
280 * Get the guid of a port in big endian byte order
282 int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp,
283 int guid_index, __be64 *guid);
286 * Query driver for the state of the port.
288 int (*query_port_state)(struct rvt_dev_info *rdi, u8 port_num,
289 struct ib_port_attr *props);
292 * Tell driver to shutdown a port
294 int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);
296 /* Tell driver to send a trap for changed port capabilities */
297 void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 port_num);
300 * The following functions can be safely ignored completely. Any use of
301 * these is checked for NULL before blindly calling. Rdmavt should also
302 * be functional if drivers omit these.
305 /* Called to inform the driver that all qps should now be freed. */
306 unsigned (*free_all_qps)(struct rvt_dev_info *rdi);
308 /* Driver specific AH validation */
309 int (*check_ah)(struct ib_device *, struct ib_ah_attr *);
311 /* Inform the driver a new AH has been created */
312 void (*notify_new_ah)(struct ib_device *, struct ib_ah_attr *,
315 /* Let the driver pick the next queue pair number*/
316 int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
317 enum ib_qp_type type, u8 port_num, gfp_t gfp);
319 /* Determine if its safe or allowed to modify the qp */
320 int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
321 int attr_mask, struct ib_udata *udata);
323 /* Driver specific QP modification/notification-of */
324 void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
325 int attr_mask, struct ib_udata *udata);
327 /* Driver specific work request checking */
328 int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe);
330 /* Notify driver a mad agent has been created */
331 void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
333 /* Notify driver a mad agent has been removed */
334 void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
338 struct rvt_dev_info {
339 struct ib_device ibdev; /* Keep this first. Nothing above here */
342 * Prior to calling for registration the driver will be responsible for
343 * allocating space for this structure.
345 * The driver will also be responsible for filling in certain members of
346 * dparms.props. The driver needs to fill in dparms exactly as it would
347 * want values reported to a ULP. This will be returned to the caller
348 * in rdmavt's device. The driver should also therefore refrain from
349 * modifying this directly after registration with rdmavt.
352 /* Driver specific properties */
353 struct rvt_driver_params dparms;
355 /* post send table */
356 const struct rvt_operation_params *post_parms;
358 struct rvt_mregion __rcu *dma_mr;
359 struct rvt_lkey_table lkey_table;
361 /* Driver specific helper functions */
362 struct rvt_driver_provided driver_f;
366 spinlock_t n_pds_lock; /* Protect pd allocated count */
369 spinlock_t n_ahs_lock; /* Protect ah allocated count */
371 u32 n_srqs_allocated;
372 spinlock_t n_srqs_lock; /* Protect srqs allocated count */
375 struct rvt_ibport **ports;
378 struct rvt_qp_ibdev *qp_dev;
379 u32 n_qps_allocated; /* number of QPs allocated for device */
380 u32 n_rc_qps; /* number of RC QPs allocated for device */
381 u32 busy_jiffies; /* timeout scaling based on RC QP count */
382 spinlock_t n_qps_lock; /* protect qps, rc qps and busy jiffy counts */
385 struct list_head pending_mmaps;
386 spinlock_t mmap_offset_lock; /* protect mmap_offset */
388 spinlock_t pending_lock; /* protect pending mmap list */
391 struct kthread_worker *worker; /* per device cq worker */
392 u32 n_cqs_allocated; /* number of CQs allocated for device */
393 spinlock_t n_cqs_lock; /* protect count of in use cqs */
396 u32 n_mcast_grps_allocated; /* number of mcast groups allocated */
397 spinlock_t n_mcast_grps_lock;
401 static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd)
403 return container_of(ibpd, struct rvt_pd, ibpd);
406 static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah)
408 return container_of(ibah, struct rvt_ah, ibah);
411 static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev)
413 return container_of(ibdev, struct rvt_dev_info, ibdev);
416 static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
418 return container_of(ibsrq, struct rvt_srq, ibsrq);
421 static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
423 return container_of(ibqp, struct rvt_qp, ibqp);
426 static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
429 * All ports have same number of pkeys.
431 return rdi->dparms.npkeys;
435 * Return the max atomic suitable for determining
436 * the size of the ack ring buffer in a QP.
438 static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi)
440 return rdi->dparms.max_rdma_atomic + 1;
444 * Return the indexed PKEY from the port PKEY table.
446 static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi,
450 if (index >= rvt_get_npkeys(rdi))
453 return rdi->ports[port_index]->pkey_table[index];
457 * rvt_lookup_qpn - return the QP with the given QPN
459 * @qpn: the QP number to look up
461 * The caller must hold the rcu_read_lock(), and keep the lock until
462 * the returned qp is no longer in use.
464 /* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */
465 static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
466 struct rvt_ibport *rvp,
467 u32 qpn) __must_hold(RCU)
469 struct rvt_qp *qp = NULL;
471 if (unlikely(qpn <= 1)) {
472 qp = rcu_dereference(rvp->qp[qpn]);
474 u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);
476 for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
477 qp = rcu_dereference(qp->next))
478 if (qp->ibqp.qp_num == qpn)
484 struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
485 void rvt_dealloc_device(struct rvt_dev_info *rdi);
486 int rvt_register_device(struct rvt_dev_info *rvd);
487 void rvt_unregister_device(struct rvt_dev_info *rvd);
488 int rvt_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);
489 int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port,
490 int port_index, u16 *pkey_table);
491 int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
493 int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey);
494 int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
495 u32 len, u64 vaddr, u32 rkey, int acc);
496 int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
497 struct rvt_sge *isge, struct ib_sge *sge, int acc);
498 struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid);
500 #endif /* DEF_RDMA_VT_H */