/* 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 */