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linux-headers-6.8.0-36-generic
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rdma_vt.h
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ /* * Copyright(c) 2016 - 2019 Intel Corporation. */ #ifndef DEF_RDMA_VT_H #define DEF_RDMA_VT_H /* * Structure that low level drivers will populate in order to register with the * rdmavt layer. */ #include <linux/spinlock.h> #include <linux/list.h> #include <linux/hash.h> #include <rdma/ib_verbs.h> #include <rdma/ib_mad.h> #include <rdma/rdmavt_mr.h> #define RVT_MAX_PKEY_VALUES 16 #define RVT_MAX_TRAP_LEN 100 /* Limit pending trap list */ #define RVT_MAX_TRAP_LISTS 5 /*((IB_NOTICE_TYPE_INFO & 0x0F) + 1)*/ #define RVT_TRAP_TIMEOUT 4096 /* 4.096 usec */ struct trap_list { u32 list_len; struct list_head list; }; struct rvt_qp; struct rvt_qpn_table; struct rvt_ibport { struct rvt_qp __rcu *qp[2]; struct ib_mad_agent *send_agent; /* agent for SMI (traps) */ struct rb_root mcast_tree; spinlock_t lock; /* protect changes in this struct */ /* non-zero when timer is set */ unsigned long mkey_lease_timeout; unsigned long trap_timeout; __be64 gid_prefix; /* in network order */ __be64 mkey; u64 tid; u32 port_cap_flags; u16 port_cap3_flags; u32 pma_sample_start; u32 pma_sample_interval; __be16 pma_counter_select[5]; u16 pma_tag; u16 mkey_lease_period; u32 sm_lid; u8 sm_sl; u8 mkeyprot; u8 subnet_timeout; u8 vl_high_limit; /* * Driver is expected to keep these up to date. These * counters are informational only and not required to be * completely accurate. */ u64 n_rc_resends; u64 n_seq_naks; u64 n_rdma_seq; u64 n_rnr_naks; u64 n_other_naks; u64 n_loop_pkts; u64 n_pkt_drops; u64 n_vl15_dropped; u64 n_rc_timeouts; u64 n_dmawait; u64 n_unaligned; u64 n_rc_dupreq; u64 n_rc_seqnak; u64 n_rc_crwaits; u16 pkey_violations; u16 qkey_violations; u16 mkey_violations; /* Hot-path per CPU counters to avoid cacheline trading to update */ u64 z_rc_acks; u64 z_rc_qacks; u64 z_rc_delayed_comp; u64 __percpu *rc_acks; u64 __percpu *rc_qacks; u64 __percpu *rc_delayed_comp; void *priv; /* driver private data */ /* * The pkey table is allocated and maintained by the driver. Drivers * need to have access to this before registering with rdmav. However * rdmavt will need access to it so drivers need to provide this during * the attach port API call. */ u16 *pkey_table; struct rvt_ah *sm_ah; /* * Keep a list of traps that have not been repressed. They will be * resent based on trap_timer. */ struct trap_list trap_lists[RVT_MAX_TRAP_LISTS]; struct timer_list trap_timer; }; #define RVT_CQN_MAX 16 /* maximum length of cq name */ #define RVT_SGE_COPY_MEMCPY 0 #define RVT_SGE_COPY_CACHELESS 1 #define RVT_SGE_COPY_ADAPTIVE 2 /* * Things that are driver specific, module parameters in hfi1 and qib */ struct rvt_driver_params { struct ib_device_attr props; /* * Anything driver specific that is not covered by props * For instance special module parameters. Goes here. */ unsigned int lkey_table_size; unsigned int qp_table_size; unsigned int sge_copy_mode; unsigned int wss_threshold; unsigned int wss_clean_period; int qpn_start; int qpn_inc; int qpn_res_start; int qpn_res_end; int nports; int npkeys; int node; int psn_mask; int psn_shift; int psn_modify_mask; u32 core_cap_flags; u32 max_mad_size; u8 qos_shift; u8 max_rdma_atomic; u8 extra_rdma_atomic; u8 reserved_operations; }; /* User context */ struct rvt_ucontext { struct ib_ucontext ibucontext; }; /* Protection domain */ struct rvt_pd { struct ib_pd ibpd; bool user; }; /* Address handle */ struct rvt_ah { struct ib_ah ibah; struct rdma_ah_attr attr; u8 vl; u8 log_pmtu; }; /* * This structure is used by rvt_mmap() to validate an offset * when an mmap() request is made. The vm_area_struct then uses * this as its vm_private_data. */ struct rvt_mmap_info { struct list_head pending_mmaps; struct ib_ucontext *context; void *obj; __u64 offset; struct kref ref; u32 size; }; /* memory working set size */ struct rvt_wss { unsigned long *entries; atomic_t total_count; atomic_t clean_counter; atomic_t clean_entry; int threshold; int num_entries; long pages_mask; unsigned int clean_period; }; struct rvt_dev_info; struct rvt_swqe; struct rvt_driver_provided { /* * Which functions are required depends on which verbs rdmavt is * providing and which verbs the driver is overriding. See * check_support() for details. */ /* hot path calldowns in a single cacheline */ /* * Give the driver a notice that there is send work to do. It is up to * the driver to generally push the packets out, this just queues the * work with the driver. There are two variants here. The no_lock * version requires the s_lock not to be held. The other assumes the * s_lock is held. */ bool (*schedule_send)(struct rvt_qp *qp); bool (*schedule_send_no_lock)(struct rvt_qp *qp); /* * Driver specific work request setup and checking. * This function is allowed to perform any setup, checks, or * adjustments required to the SWQE in order to be usable by * underlying protocols. This includes private data structure * allocations. */ int (*setup_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe, bool *call_send); /* * Sometimes rdmavt needs to kick the driver's send progress. That is * done by this call back. */ void (*do_send)(struct rvt_qp *qp); /* * Returns a pointer to the underlying hardware's PCI device. This is * used to display information as to what hardware is being referenced * in an output message */ struct pci_dev * (*get_pci_dev)(struct rvt_dev_info *rdi); /* * Allocate a private queue pair data structure for driver specific * information which is opaque to rdmavt. Errors are returned via * ERR_PTR(err). The driver is free to return NULL or a valid * pointer. */ void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp); /* * Init a structure allocated with qp_priv_alloc(). This should be * called after all qp fields have been initialized in rdmavt. */ int (*qp_priv_init)(struct rvt_dev_info *rdi, struct rvt_qp *qp, struct ib_qp_init_attr *init_attr); /* * Free the driver's private qp structure. */ void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp); /* * Inform the driver the particular qp in question has been reset so * that it can clean up anything it needs to. */ void (*notify_qp_reset)(struct rvt_qp *qp); /* * Get a path mtu from the driver based on qp attributes. */ int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp, struct ib_qp_attr *attr); /* * Notify driver that it needs to flush any outstanding IO requests that * are waiting on a qp. */ void (*flush_qp_waiters)(struct rvt_qp *qp); /* * Notify driver to stop its queue of sending packets. Nothing else * should be posted to the queue pair after this has been called. */ void (*stop_send_queue)(struct rvt_qp *qp); /* * Have the driver drain any in progress operations */ void (*quiesce_qp)(struct rvt_qp *qp); /* * Inform the driver a qp has went to error state. */ void (*notify_error_qp)(struct rvt_qp *qp); /* * Get an MTU for a qp. */ u32 (*mtu_from_qp)(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu); /* * Convert an mtu to a path mtu */ int (*mtu_to_path_mtu)(u32 mtu); /* * Get the guid of a port in big endian byte order */ int (*get_guid_be)(struct rvt_dev_info *rdi, struct rvt_ibport *rvp, int guid_index, __be64 *guid); /* * Query driver for the state of the port. */ int (*query_port_state)(struct rvt_dev_info *rdi, u32 port_num, struct ib_port_attr *props); /* * Tell driver to shutdown a port */ int (*shut_down_port)(struct rvt_dev_info *rdi, u32 port_num); /* Tell driver to send a trap for changed port capabilities */ void (*cap_mask_chg)(struct rvt_dev_info *rdi, u32 port_num); /* * The following functions can be safely ignored completely. Any use of * these is checked for NULL before blindly calling. Rdmavt should also * be functional if drivers omit these. */ /* Called to inform the driver that all qps should now be freed. */ unsigned (*free_all_qps)(struct rvt_dev_info *rdi); /* Driver specific AH validation */ int (*check_ah)(struct ib_device *, struct rdma_ah_attr *); /* Inform the driver a new AH has been created */ void (*notify_new_ah)(struct ib_device *, struct rdma_ah_attr *, struct rvt_ah *); /* Let the driver pick the next queue pair number*/ int (*alloc_qpn)(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt, enum ib_qp_type type, u32 port_num); /* Determine if its safe or allowed to modify the qp */ int (*check_modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr, int attr_mask, struct ib_udata *udata); /* Driver specific QP modification/notification-of */ void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr, int attr_mask, struct ib_udata *udata); /* Notify driver a mad agent has been created */ void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx); /* Notify driver a mad agent has been removed */ void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx); /* Notify driver to restart rc */ void (*notify_restart_rc)(struct rvt_qp *qp, u32 psn, int wait); /* Get and return CPU to pin CQ processing thread */ int (*comp_vect_cpu_lookup)(struct rvt_dev_info *rdi, int comp_vect); }; struct rvt_dev_info { struct ib_device ibdev; /* Keep this first. Nothing above here */ /* * Prior to calling for registration the driver will be responsible for * allocating space for this structure. * * The driver will also be responsible for filling in certain members of * dparms.props. The driver needs to fill in dparms exactly as it would * want values reported to a ULP. This will be returned to the caller * in rdmavt's device. The driver should also therefore refrain from * modifying this directly after registration with rdmavt. */ /* Driver specific properties */ struct rvt_driver_params dparms; /* post send table */ const struct rvt_operation_params *post_parms; /* opcode translation table */ const enum ib_wc_opcode *wc_opcode; /* Driver specific helper functions */ struct rvt_driver_provided driver_f; struct rvt_mregion __rcu *dma_mr; struct rvt_lkey_table lkey_table; /* Internal use */ int n_pds_allocated; spinlock_t n_pds_lock; /* Protect pd allocated count */ int n_ahs_allocated; spinlock_t n_ahs_lock; /* Protect ah allocated count */ u32 n_srqs_allocated; spinlock_t n_srqs_lock; /* Protect srqs allocated count */ int flags; struct rvt_ibport **ports; /* QP */ struct rvt_qp_ibdev *qp_dev; u32 n_qps_allocated; /* number of QPs allocated for device */ u32 n_rc_qps; /* number of RC QPs allocated for device */ u32 busy_jiffies; /* timeout scaling based on RC QP count */ spinlock_t n_qps_lock; /* protect qps, rc qps and busy jiffy counts */ /* memory maps */ struct list_head pending_mmaps; spinlock_t mmap_offset_lock; /* protect mmap_offset */ u32 mmap_offset; spinlock_t pending_lock; /* protect pending mmap list */ /* CQ */ u32 n_cqs_allocated; /* number of CQs allocated for device */ spinlock_t n_cqs_lock; /* protect count of in use cqs */ /* Multicast */ u32 n_mcast_grps_allocated; /* number of mcast groups allocated */ spinlock_t n_mcast_grps_lock; /* Memory Working Set Size */ struct rvt_wss *wss; }; /** * rvt_set_ibdev_name - Craft an IB device name from client info * @rdi: pointer to the client rvt_dev_info structure * @name: client specific name * @unit: client specific unit number. */ static inline void rvt_set_ibdev_name(struct rvt_dev_info *rdi, const char *fmt, const char *name, const int unit) { /* * FIXME: rvt and its users want to touch the ibdev before * registration and have things like the name work. We don't have the * infrastructure in the core to support this directly today, hack it * to work by setting the name manually here. */ dev_set_name(&rdi->ibdev.dev, fmt, name, unit); strscpy(rdi->ibdev.name, dev_name(&rdi->ibdev.dev), IB_DEVICE_NAME_MAX); } /** * rvt_get_ibdev_name - return the IB name * @rdi: rdmavt device * * Return the registered name of the device. */ static inline const char *rvt_get_ibdev_name(const struct rvt_dev_info *rdi) { return dev_name(&rdi->ibdev.dev); } static inline struct rvt_pd *ibpd_to_rvtpd(struct ib_pd *ibpd) { return container_of(ibpd, struct rvt_pd, ibpd); } static inline struct rvt_ah *ibah_to_rvtah(struct ib_ah *ibah) { return container_of(ibah, struct rvt_ah, ibah); } static inline struct rvt_dev_info *ib_to_rvt(struct ib_device *ibdev) { return container_of(ibdev, struct rvt_dev_info, ibdev); } static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi) { /* * All ports have same number of pkeys. */ return rdi->dparms.npkeys; } /* * Return the max atomic suitable for determining * the size of the ack ring buffer in a QP. */ static inline unsigned int rvt_max_atomic(struct rvt_dev_info *rdi) { return rdi->dparms.max_rdma_atomic + rdi->dparms.extra_rdma_atomic + 1; } static inline unsigned int rvt_size_atomic(struct rvt_dev_info *rdi) { return rdi->dparms.max_rdma_atomic + rdi->dparms.extra_rdma_atomic; } /* * Return the indexed PKEY from the port PKEY table. */ static inline u16 rvt_get_pkey(struct rvt_dev_info *rdi, int port_index, unsigned index) { if (index >= rvt_get_npkeys(rdi)) return 0; else return rdi->ports[port_index]->pkey_table[index]; } struct rvt_dev_info *rvt_alloc_device(size_t size, int nports); void rvt_dealloc_device(struct rvt_dev_info *rdi); int rvt_register_device(struct rvt_dev_info *rvd); void rvt_unregister_device(struct rvt_dev_info *rvd); int rvt_check_ah(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr); int rvt_init_port(struct rvt_dev_info *rdi, struct rvt_ibport *port, int port_index, u16 *pkey_table); int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key, int access); int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey); int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge, u32 len, u64 vaddr, u32 rkey, int acc); int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd, struct rvt_sge *isge, struct rvt_sge *last_sge, struct ib_sge *sge, int acc); struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid, u16 lid); #endif /* DEF_RDMA_VT_H */
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