Linux 4.6-rc6

[cris-mirror.git] / include / rdma / rdma_vt.h

#ifndef DEF_RDMA_VT_H
#define DEF_RDMA_VT_H

/*
 * Copyright(c) 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 * 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/rdmavt_mr.h>
#include <rdma/rdmavt_qp.h>

#define RVT_MAX_PKEY_VALUES 16

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;
        u32 pma_sample_start;
        u32 pma_sample_interval;
        __be16 pma_counter_select[5];
        u16 pma_tag;
        u16 mkey_lease_period;
        u16 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;
        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 proviee this during
         * the attach port API call.
         */
        u16 *pkey_table;

        struct rvt_ah *sm_ah;
};

#define RVT_CQN_MAX 16 /* maximum length of cq name */

/*
 * 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;
        int qpn_start;
        int qpn_inc;
        int qpn_res_start;
        int qpn_res_end;
        int nports;
        int npkeys;
        u8 qos_shift;
        char cq_name[RVT_CQN_MAX];
        int node;
        int max_rdma_atomic;
        int psn_mask;
        int psn_shift;
        int psn_modify_mask;
        u32 core_cap_flags;
        u32 max_mad_size;
};

/* Protection domain */
struct rvt_pd {
        struct ib_pd ibpd;
        int user;               /* non-zero if created from user space */
};

/* Address handle */
struct rvt_ah {
        struct ib_ah ibah;
        struct ib_ah_attr attr;
        atomic_t refcount;
        u8 vl;
        u8 log_pmtu;
};

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.
         */

        /* Passed to ib core registration. Callback to create syfs files */
        int (*port_callback)(struct ib_device *, u8, struct kobject *);

        /*
         * Returns a string to represent the device for which is being
         * registered. This is primarily used for error and debug messages on
         * the console.
         */
        const char * (*get_card_name)(struct rvt_dev_info *rdi);

        /*
         * Returns a pointer to the undelying 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.
         */
        void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
                                gfp_t gfp);

        /*
         * 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 quesiton has been reset so
         * that it can clean up anything it needs to.
         */
        void (*notify_qp_reset)(struct rvt_qp *qp);

        /*
         * 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.
         */
        void (*schedule_send)(struct rvt_qp *qp);
        void (*schedule_send_no_lock)(struct rvt_qp *qp);

        /*
         * Sometimes rdmavt needs to kick the driver's send progress. That is
         * done by this call back.
         */
        void (*do_send)(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 drivr 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, u8 port_num,
                                struct ib_port_attr *props);

        /*
         * Tell driver to shutdown a port
         */
        int (*shut_down_port)(struct rvt_dev_info *rdi, u8 port_num);

        /* Tell driver to send a trap for changed  port capabilities */
        void (*cap_mask_chg)(struct rvt_dev_info *rdi, u8 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 ib_ah_attr *);

        /* Inform the driver a new AH has been created */
        void (*notify_new_ah)(struct ib_device *, struct ib_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, u8 port_num, gfp_t gfp);

        /* 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);

        /* Driver specific work request checking */
        int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe);

        /* 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);

};

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;

        struct rvt_mregion __rcu *dma_mr;
        struct rvt_lkey_table lkey_table;

        /* Driver specific helper functions */
        struct rvt_driver_provided driver_f;

        /* 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 */
        struct kthread_worker *worker; /* per device cq worker */
        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;

};

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 struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
{
        return container_of(ibsrq, struct rvt_srq, ibsrq);
}

static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
{
        return container_of(ibqp, struct rvt_qp, ibqp);
}

static inline unsigned rvt_get_npkeys(struct rvt_dev_info *rdi)
{
        /*
         * All ports have same number of pkeys.
         */
        return rdi->dparms.npkeys;
}

/*
 * 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];
}

/**
 * rvt_lookup_qpn - return the QP with the given QPN
 * @ibp: the ibport
 * @qpn: the QP number to look up
 *
 * The caller must hold the rcu_read_lock(), and keep the lock until
 * the returned qp is no longer in use.
 */
/* TODO: Remove this and put in rdmavt/qp.h when no longer needed by drivers */
static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
                                            struct rvt_ibport *rvp,
                                            u32 qpn) __must_hold(RCU)
{
        struct rvt_qp *qp = NULL;

        if (unlikely(qpn <= 1)) {
                qp = rcu_dereference(rvp->qp[qpn]);
        } else {
                u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);

                for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
                        qp = rcu_dereference(qp->next))
                        if (qp->ibqp.qp_num == qpn)
                                break;
        }
        return qp;
}

struct rvt_dev_info *rvt_alloc_device(size_t size, int nports);
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 ib_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_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 ib_sge *sge, int acc);
struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid);

#endif          /* DEF_RDMA_VT_H */