Current File : //lib/modules/3.10.0-957.21.3.el7.centos.plus.x86_64/source/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/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 */
/*
* 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;
char cq_name[RVT_CQN_MAX];
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;
};
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.
*/
void (*schedule_send)(struct rvt_qp *qp);
void (*schedule_send_no_lock)(struct rvt_qp *qp);
/* Driver specific work request checking */
int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe);
/*
* 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);
};
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;
/* 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 */
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;
};
/**
* 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)
{
snprintf(rdi->ibdev.name, sizeof(rdi->ibdev.name), fmt, name, unit);
}
/**
* 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 rdi->ibdev.name;
}
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);
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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