text: #ifndef DEF_RDMA_VT_H
  #define DEF_RDMA_VT_H
  
  /*
   * Copyright(c) 2016 - 2018 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/ib_mad.h>
  #include <rdma/rdmavt_mr.h>
  #include <rdma/rdmavt_qp.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_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;
  	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;
  
  	/*
  	 * 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 reserved_operations;
  };
  
  /* 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;
  	atomic_t refcount;
  	u8 vl;
  	u8 log_pmtu;
  };
  
  /* 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);
  
  	/* Passed to ib core registration. Callback to create syfs files */
  	int (*port_callback)(struct ib_device *, u8, struct kobject *);
  
  	/*
  	 * 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.  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);
  
  	/*
  	 * 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);
  
  	/*
  	 * 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 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, u8 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);
  	strlcpy(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 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 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 + 1;
  }
  
  /*
   * 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;
  }
  
  /**
   * rvt_mod_retry_timer - mod a retry timer
   * @qp - the QP
   * Modify a potentially already running retry timer
   */
  static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
  {
  	struct ib_qp *ibqp = &qp->ibqp;
  	struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
  
  	lockdep_assert_held(&qp->s_lock);
  	qp->s_flags |= RVT_S_TIMER;
  	/* 4.096 usec. * (1 << qp->timeout) */
  	mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies +
  		  rdi->busy_jiffies);
  }
  
  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, u32 driver_id);
  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 */
  