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IB/qib: Remove create qp and create qp table functionality

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Rely on rdmavt functions for creation of qp and qp table.  Function to
allocate a qpn is still being provided by qib as the algorithm to allocate
a qpn in qib is different from that of the algorithm in rdmavt.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Harish Chegondi 2016-01-22 12:56:52 -08:00 committed by Doug Ledford
parent 01ba79d4dd
commit 47c7ea6d8e
4 changed files with 57 additions and 374 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/infiniband/hw/qib/qib.h
View File

@ -1136,8 +1136,9 @@ extern spinlock_t qib_devs_lock;
extern struct qib_devdata *qib_lookup(int unit);
extern u32 qib_cpulist_count;
extern unsigned long *qib_cpulist;
extern u16 qpt_mask;
extern unsigned qib_cc_table_size;
int qib_init(struct qib_devdata *, int);
int init_chip_wc_pat(struct qib_devdata *dd, u32);
int qib_enable_wc(struct qib_devdata *dd);

361
drivers/infiniband/hw/qib/qib_qp.c
View File

@ -48,7 +48,7 @@
* as qpt_mask here instead of adding the mask field to
* rvt_qpn_table.
*/
static u16 qpt_mask;
u16 qpt_mask;
static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
struct rvt_qpn_map *map, unsigned off)
@ -128,12 +128,15 @@ static void get_map_page(struct rvt_qpn_table *qpt, struct rvt_qpn_map *map,
* Allocate the next available QPN or
* zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
*/
static int alloc_qpn(struct qib_devdata *dd, struct rvt_qpn_table *qpt,
enum ib_qp_type type, u8 port, gfp_t gfp)
int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
enum ib_qp_type type, u8 port, gfp_t gfp)
{
u32 i, offset, max_scan, qpn;
struct rvt_qpn_map *map;
u32 ret;
struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
verbs_dev);
if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
unsigned n;
@ -296,18 +299,13 @@ static void remove_qp(struct qib_ibdev *dev, struct rvt_qp *qp)
/**
* qib_free_all_qps - check for QPs still in use
* @qpt: the QP table to empty
*
* There should not be any QPs still in use.
* Free memory for table.
*/
unsigned qib_free_all_qps(struct qib_devdata *dd)
unsigned qib_free_all_qps(struct rvt_dev_info *rdi)
{
struct qib_ibdev *dev = &dd->verbs_dev;
unsigned long flags;
struct rvt_qp *qp;
struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
verbs_dev);
unsigned n, qp_inuse = 0;
spinlock_t *qpt_lock_ptr; /* Pointer to make checkpatch happy */
for (n = 0; n < dd->num_pports; n++) {
struct qib_ibport *ibp = &dd->pport[n].ibport_data;
@ -321,21 +319,6 @@ unsigned qib_free_all_qps(struct qib_devdata *dd)
qp_inuse++;
rcu_read_unlock();
}
spin_lock_irqsave(&dev->rdi.qp_dev->qpt_lock, flags);
qpt_lock_ptr = &dev->rdi.qp_dev->qpt_lock;
for (n = 0; n < dev->rdi.qp_dev->qp_table_size; n++) {
qp = rcu_dereference_protected(dev->rdi.qp_dev->qp_table[n],
lockdep_is_held(qpt_lock_ptr));
RCU_INIT_POINTER(dev->rdi.qp_dev->qp_table[n], NULL);
for (; qp; qp = rcu_dereference_protected(qp->next,
lockdep_is_held(qpt_lock_ptr)))
qp_inuse++;
}
spin_unlock_irqrestore(&dev->rdi.qp_dev->qpt_lock, flags);
synchronize_rcu();
return qp_inuse;
}
@ -374,57 +357,11 @@ struct rvt_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
return qp;
}
/**
* qib_reset_qp - initialize the QP state to the reset state
* @qp: the QP to reset
* @type: the QP type
*/
static void qib_reset_qp(struct rvt_qp *qp, enum ib_qp_type type)
void notify_qp_reset(struct rvt_qp *qp)
{
struct qib_qp_priv *priv = qp->priv;
qp->remote_qpn = 0;
qp->qkey = 0;
qp->qp_access_flags = 0;
atomic_set(&priv->s_dma_busy, 0);
qp->s_flags &= RVT_S_SIGNAL_REQ_WR;
qp->s_hdrwords = 0;
qp->s_wqe = NULL;
qp->s_draining = 0;
qp->s_next_psn = 0;
qp->s_last_psn = 0;
qp->s_sending_psn = 0;
qp->s_sending_hpsn = 0;
qp->s_psn = 0;
qp->r_psn = 0;
qp->r_msn = 0;
if (type == IB_QPT_RC) {
qp->s_state = IB_OPCODE_RC_SEND_LAST;
qp->r_state = IB_OPCODE_RC_SEND_LAST;
} else {
qp->s_state = IB_OPCODE_UC_SEND_LAST;
qp->r_state = IB_OPCODE_UC_SEND_LAST;
}
qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
qp->r_nak_state = 0;
qp->r_aflags = 0;
qp->r_flags = 0;
qp->s_head = 0;
qp->s_tail = 0;
qp->s_cur = 0;
qp->s_acked = 0;
qp->s_last = 0;
qp->s_ssn = 1;
qp->s_lsn = 0;
qp->s_mig_state = IB_MIG_MIGRATED;
memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
qp->r_head_ack_queue = 0;
qp->s_tail_ack_queue = 0;
qp->s_num_rd_atomic = 0;
if (qp->r_rq.wq) {
qp->r_rq.wq->head = 0;
qp->r_rq.wq->tail = 0;
}
qp->r_sge.num_sge = 0;
}
static void clear_mr_refs(struct rvt_qp *qp, int clr_sends)
@ -733,7 +670,7 @@ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
spin_lock_irq(&qp->r_lock);
spin_lock(&qp->s_lock);
clear_mr_refs(qp, 1);
qib_reset_qp(qp, ibqp->qp_type);
rvt_reset_qp(&dev->rdi, qp, ibqp->qp_type);
}
break;
@ -979,246 +916,33 @@ __be32 qib_compute_aeth(struct rvt_qp *qp)
return cpu_to_be32(aeth);
}
/**
* qib_create_qp - create a queue pair for a device
* @ibpd: the protection domain who's device we create the queue pair for
* @init_attr: the attributes of the queue pair
* @udata: user data for libibverbs.so
*
* Returns the queue pair on success, otherwise returns an errno.
*
* Called by the ib_create_qp() core verbs function.
*/
struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata)
void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp, gfp_t gfp)
{
struct rvt_qp *qp;
int err;
struct rvt_swqe *swq = NULL;
struct qib_ibdev *dev;
struct qib_devdata *dd;
size_t sz;
size_t sg_list_sz;
struct ib_qp *ret;
gfp_t gfp;
struct qib_qp_priv *priv;
if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
init_attr->cap.max_send_wr > ib_qib_max_qp_wrs ||
init_attr->create_flags & ~(IB_QP_CREATE_USE_GFP_NOIO))
return ERR_PTR(-EINVAL);
priv = kzalloc(sizeof(*priv), gfp);
if (!priv)
return ERR_PTR(-ENOMEM);
priv->owner = qp;
/* GFP_NOIO is applicable in RC QPs only */
if (init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO &&
init_attr->qp_type != IB_QPT_RC)
return ERR_PTR(-EINVAL);
gfp = init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO ?
GFP_NOIO : GFP_KERNEL;
/* Check receive queue parameters if no SRQ is specified. */
if (!init_attr->srq) {
if (init_attr->cap.max_recv_sge > ib_qib_max_sges ||
init_attr->cap.max_recv_wr > ib_qib_max_qp_wrs) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
if (init_attr->cap.max_send_sge +
init_attr->cap.max_send_wr +
init_attr->cap.max_recv_sge +
init_attr->cap.max_recv_wr == 0) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
priv->s_hdr = kzalloc(sizeof(*priv->s_hdr), gfp);
if (!priv->s_hdr) {
kfree(priv);
return ERR_PTR(-ENOMEM);
}
init_waitqueue_head(&priv->wait_dma);
INIT_WORK(&priv->s_work, qib_do_send);
INIT_LIST_HEAD(&priv->iowait);
switch (init_attr->qp_type) {
case IB_QPT_SMI:
case IB_QPT_GSI:
if (init_attr->port_num == 0 ||
init_attr->port_num > ibpd->device->phys_port_cnt) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
case IB_QPT_UC:
case IB_QPT_RC:
case IB_QPT_UD:
sz = sizeof(struct rvt_sge) *
init_attr->cap.max_send_sge +
sizeof(struct rvt_swqe);
swq = __vmalloc((init_attr->cap.max_send_wr + 1) * sz,
gfp, PAGE_KERNEL);
if (swq == NULL) {
ret = ERR_PTR(-ENOMEM);
goto bail;
}
sz = sizeof(*qp);
sg_list_sz = 0;
if (init_attr->srq) {
struct rvt_srq *srq = ibsrq_to_rvtsrq(init_attr->srq);
return priv;
}
if (srq->rq.max_sge > 1)
sg_list_sz = sizeof(*qp->r_sg_list) *
(srq->rq.max_sge - 1);
} else if (init_attr->cap.max_recv_sge > 1)
sg_list_sz = sizeof(*qp->r_sg_list) *
(init_attr->cap.max_recv_sge - 1);
qp = kzalloc(sz + sg_list_sz, gfp);
if (!qp) {
ret = ERR_PTR(-ENOMEM);
goto bail_swq;
}
RCU_INIT_POINTER(qp->next, NULL);
priv = kzalloc(sizeof(*priv), gfp);
if (!priv) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp_hdr;
}
priv->owner = qp;
priv->s_hdr = kzalloc(sizeof(*priv->s_hdr), gfp);
if (!priv->s_hdr) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp;
}
qp->priv = priv;
qp->timeout_jiffies =
usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1000UL);
if (init_attr->srq)
sz = 0;
else {
qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
sizeof(struct rvt_rwqe);
if (gfp != GFP_NOIO)
qp->r_rq.wq = vmalloc_user(
sizeof(struct rvt_rwq) +
qp->r_rq.size * sz);
else
qp->r_rq.wq = __vmalloc(
sizeof(struct rvt_rwq) +
qp->r_rq.size * sz,
gfp, PAGE_KERNEL);
void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
{
struct qib_qp_priv *priv = qp->priv;
if (!qp->r_rq.wq) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp;
}
}
/*
* ib_create_qp() will initialize qp->ibqp
* except for qp->ibqp.qp_num.
*/
spin_lock_init(&qp->r_lock);
spin_lock_init(&qp->s_lock);
spin_lock_init(&qp->r_rq.lock);
atomic_set(&qp->refcount, 0);
init_waitqueue_head(&qp->wait);
init_waitqueue_head(&priv->wait_dma);
init_timer(&qp->s_timer);
qp->s_timer.data = (unsigned long)qp;
INIT_WORK(&priv->s_work, qib_do_send);
INIT_LIST_HEAD(&priv->iowait);
INIT_LIST_HEAD(&qp->rspwait);
qp->state = IB_QPS_RESET;
qp->s_wq = swq;
qp->s_size = init_attr->cap.max_send_wr + 1;
qp->s_max_sge = init_attr->cap.max_send_sge;
if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
qp->s_flags = RVT_S_SIGNAL_REQ_WR;
dev = to_idev(ibpd->device);
dd = dd_from_dev(dev);
err = alloc_qpn(dd, &dev->rdi.qp_dev->qpn_table,
init_attr->qp_type, init_attr->port_num, gfp);
if (err < 0) {
ret = ERR_PTR(err);
vfree(qp->r_rq.wq);
goto bail_qp;
}
qp->ibqp.qp_num = err;
qp->port_num = init_attr->port_num;
qib_reset_qp(qp, init_attr->qp_type);
break;
default:
/* Don't support raw QPs */
ret = ERR_PTR(-ENOSYS);
goto bail;
}
init_attr->cap.max_inline_data = 0;
/*
* Return the address of the RWQ as the offset to mmap.
* See qib_mmap() for details.
*/
if (udata && udata->outlen >= sizeof(__u64)) {
if (!qp->r_rq.wq) {
__u64 offset = 0;
err = ib_copy_to_udata(udata, &offset,
sizeof(offset));
if (err) {
ret = ERR_PTR(err);
goto bail_ip;
}
} else {
u32 s = sizeof(struct rvt_rwq) + qp->r_rq.size * sz;
qp->ip = rvt_create_mmap_info(&dev->rdi, s,
ibpd->uobject->context,
qp->r_rq.wq);
if (!qp->ip) {
ret = ERR_PTR(-ENOMEM);
goto bail_ip;
}
err = ib_copy_to_udata(udata, &(qp->ip->offset),
sizeof(qp->ip->offset));
if (err) {
ret = ERR_PTR(err);
goto bail_ip;
}
}
}
spin_lock(&dev->n_qps_lock);
if (dev->n_qps_allocated == ib_qib_max_qps) {
spin_unlock(&dev->n_qps_lock);
ret = ERR_PTR(-ENOMEM);
goto bail_ip;
}
dev->n_qps_allocated++;
spin_unlock(&dev->n_qps_lock);
if (qp->ip) {
spin_lock_irq(&dev->rdi.pending_lock);
list_add(&qp->ip->pending_mmaps, &dev->rdi.pending_mmaps);
spin_unlock_irq(&dev->rdi.pending_lock);
}
ret = &qp->ibqp;
goto bail;
bail_ip:
if (qp->ip)
kref_put(&qp->ip->ref, rvt_release_mmap_info);
else
vfree(qp->r_rq.wq);
free_qpn(&dev->rdi.qp_dev->qpn_table, qp->ibqp.qp_num);
bail_qp:
kfree(priv->s_hdr);
kfree(priv);
bail_qp_hdr:
kfree(qp);
bail_swq:
vfree(swq);
bail:
return ret;
}
/**
@ -1276,31 +1000,6 @@ int qib_destroy_qp(struct ib_qp *ibqp)
return 0;
}
/**
* qib_init_qpn_table - initialize the QP number table for a device
* @qpt: the QPN table
*/
void qib_init_qpn_table(struct qib_devdata *dd, struct rvt_qpn_table *qpt)
{
spin_lock_init(&qpt->lock);
qpt->last = 1; /* start with QPN 2 */
qpt->nmaps = 1;
qpt_mask = dd->qpn_mask;
}
/**
* qib_free_qpn_table - free the QP number table for a device
* @qpt: the QPN table
*/
void qib_free_qpn_table(struct rvt_qpn_table *qpt)
{
int i;
for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
if (qpt->map[i].page)
free_page((unsigned long) qpt->map[i].page);
}
/**
* qib_get_credit - flush the send work queue of a QP
* @qp: the qp who's send work queue to flush

48
drivers/infiniband/hw/qib/qib_verbs.c
View File

@ -1904,29 +1904,11 @@ int qib_register_ib_device(struct qib_devdata *dd)
unsigned i, ctxt;
int ret;
/* allocate parent object */
dev->rdi.qp_dev = kzalloc(sizeof(*dev->rdi.qp_dev), GFP_KERNEL);
if (!dev->rdi.qp_dev)
return -ENOMEM;
dev->rdi.qp_dev->qp_table_size = ib_qib_qp_table_size;
dev->rdi.qp_dev->qp_table_bits = ilog2(ib_qib_qp_table_size);
get_random_bytes(&dev->qp_rnd, sizeof(dev->qp_rnd));
dev->rdi.qp_dev->qp_table = kmalloc_array(
dev->rdi.qp_dev->qp_table_size,
sizeof(*dev->rdi.qp_dev->qp_table),
GFP_KERNEL);
if (!dev->rdi.qp_dev->qp_table) {
ret = -ENOMEM;
goto err_qpt;
}
for (i = 0; i < dev->rdi.qp_dev->qp_table_size; i++)
RCU_INIT_POINTER(dev->rdi.qp_dev->qp_table[i], NULL);
for (i = 0; i < dd->num_pports; i++)
init_ibport(ppd + i);
/* Only need to initialize non-zero fields. */
spin_lock_init(&dev->rdi.qp_dev->qpt_lock);
spin_lock_init(&dev->n_cqs_lock);
spin_lock_init(&dev->n_qps_lock);
spin_lock_init(&dev->n_srqs_lock);
@ -1935,7 +1917,7 @@ int qib_register_ib_device(struct qib_devdata *dd)
dev->mem_timer.function = mem_timer;
dev->mem_timer.data = (unsigned long) dev;
qib_init_qpn_table(dd, &dev->rdi.qp_dev->qpn_table);
qpt_mask = dd->qpn_mask;
INIT_LIST_HEAD(&dev->piowait);
INIT_LIST_HEAD(&dev->dmawait);
@ -2032,7 +2014,7 @@ int qib_register_ib_device(struct qib_devdata *dd)
ibdev->modify_srq = qib_modify_srq;
ibdev->query_srq = qib_query_srq;
ibdev->destroy_srq = qib_destroy_srq;
ibdev->create_qp = qib_create_qp;
ibdev->create_qp = NULL;
ibdev->modify_qp = qib_modify_qp;
ibdev->query_qp = qib_query_qp;
ibdev->destroy_qp = qib_destroy_qp;
@ -2071,9 +2053,21 @@ int qib_register_ib_device(struct qib_devdata *dd)
dd->verbs_dev.rdi.driver_f.get_pci_dev = qib_get_pci_dev;
dd->verbs_dev.rdi.driver_f.check_ah = qib_check_ah;
dd->verbs_dev.rdi.driver_f.notify_new_ah = qib_notify_new_ah;
dd->verbs_dev.rdi.flags = (RVT_FLAG_QP_INIT_DRIVER |
RVT_FLAG_CQ_INIT_DRIVER);
dd->verbs_dev.rdi.driver_f.alloc_qpn = alloc_qpn;
dd->verbs_dev.rdi.driver_f.qp_priv_alloc = qp_priv_alloc;
dd->verbs_dev.rdi.driver_f.qp_priv_free = qp_priv_free;
dd->verbs_dev.rdi.driver_f.free_all_qps = qib_free_all_qps;
dd->verbs_dev.rdi.driver_f.notify_qp_reset = notify_qp_reset;
dd->verbs_dev.rdi.flags = RVT_FLAG_CQ_INIT_DRIVER;
dd->verbs_dev.rdi.dparms.lkey_table_size = qib_lkey_table_size;
dd->verbs_dev.rdi.dparms.qp_table_size = ib_qib_qp_table_size;
dd->verbs_dev.rdi.dparms.qpn_start = 1;
dd->verbs_dev.rdi.dparms.qpn_res_start = QIB_KD_QP;
dd->verbs_dev.rdi.dparms.qpn_res_end = QIB_KD_QP; /* Reserve one QP */
dd->verbs_dev.rdi.dparms.qpn_inc = 1;
dd->verbs_dev.rdi.dparms.qos_shift = 1;
dd->verbs_dev.rdi.dparms.nports = dd->num_pports;
dd->verbs_dev.rdi.dparms.npkeys = qib_get_npkeys(dd);
@ -2122,8 +2116,6 @@ err_tx:
sizeof(struct qib_pio_header),
dev->pio_hdrs, dev->pio_hdrs_phys);
err_hdrs:
kfree(dev->rdi.qp_dev->qp_table);
err_qpt:
qib_dev_err(dd, "cannot register verbs: %d!\n", -ret);
bail:
return ret;
@ -2132,7 +2124,6 @@ bail:
void qib_unregister_ib_device(struct qib_devdata *dd)
{
struct qib_ibdev *dev = &dd->verbs_dev;
u32 qps_inuse;
qib_verbs_unregister_sysfs(dd);
@ -2149,13 +2140,7 @@ void qib_unregister_ib_device(struct qib_devdata *dd)
if (!list_empty(&dev->memwait))
qib_dev_err(dd, "memwait list not empty!\n");
qps_inuse = qib_free_all_qps(dd);
if (qps_inuse)
qib_dev_err(dd, "QP memory leak! %u still in use\n",
qps_inuse);
del_timer_sync(&dev->mem_timer);
qib_free_qpn_table(&dev->rdi.qp_dev->qpn_table);
while (!list_empty(&dev->txreq_free)) {
struct list_head *l = dev->txreq_free.next;
struct qib_verbs_txreq *tx;
@ -2169,7 +2154,6 @@ void qib_unregister_ib_device(struct qib_devdata *dd)
dd->pport->sdma_descq_cnt *
sizeof(struct qib_pio_header),
dev->pio_hdrs, dev->pio_hdrs_phys);
kfree(dev->rdi.qp_dev->qp_table);
}
/*

19
drivers/infiniband/hw/qib/qib_verbs.h
View File

@ -464,10 +464,6 @@ __be32 qib_compute_aeth(struct rvt_qp *qp);
struct rvt_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn);
struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata);
int qib_destroy_qp(struct ib_qp *ibqp);
int qib_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
@ -477,12 +473,15 @@ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_qp_init_attr *init_attr);
unsigned qib_free_all_qps(struct qib_devdata *dd);
void qib_init_qpn_table(struct qib_devdata *dd, struct rvt_qpn_table *qpt);
void qib_free_qpn_table(struct rvt_qpn_table *qpt);
/*
* Functions provided by qib driver for rdmavt to use
*/
unsigned qib_free_all_qps(struct rvt_dev_info *rdi);
void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp, gfp_t gfp);
void qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp);
void notify_qp_reset(struct rvt_qp *qp);
int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
enum ib_qp_type type, u8 port, gfp_t gfp);
#ifdef CONFIG_DEBUG_FS