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/* 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_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 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;
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 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);
* Init a struture 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 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->, fmt, name, unit);
strlcpy(rdi->, dev_name(&rdi->, 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->;
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 +
* 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;
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 */