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path: root/drivers/infiniband/hw/qib/qib_qp.c
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Diffstat (limited to 'drivers/infiniband/hw/qib/qib_qp.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_qp.c90
1 files changed, 59 insertions, 31 deletions
diff --git a/drivers/infiniband/hw/qib/qib_qp.c b/drivers/infiniband/hw/qib/qib_qp.c
index e16751f8639..7e7e16fbee9 100644
--- a/drivers/infiniband/hw/qib/qib_qp.c
+++ b/drivers/infiniband/hw/qib/qib_qp.c
@@ -34,6 +34,7 @@
#include <linux/err.h>
#include <linux/vmalloc.h>
+#include <linux/jhash.h>
#include "qib.h"
@@ -204,6 +205,13 @@ static void free_qpn(struct qib_qpn_table *qpt, u32 qpn)
clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
}
+static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn)
+{
+ return jhash_1word(qpn, dev->qp_rnd) &
+ (dev->qp_table_size - 1);
+}
+
+
/*
* Put the QP into the hash table.
* The hash table holds a reference to the QP.
@@ -211,22 +219,23 @@ static void free_qpn(struct qib_qpn_table *qpt, u32 qpn)
static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
{
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
- unsigned n = qp->ibqp.qp_num % dev->qp_table_size;
unsigned long flags;
+ unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
spin_lock_irqsave(&dev->qpt_lock, flags);
+ atomic_inc(&qp->refcount);
if (qp->ibqp.qp_num == 0)
- ibp->qp0 = qp;
+ rcu_assign_pointer(ibp->qp0, qp);
else if (qp->ibqp.qp_num == 1)
- ibp->qp1 = qp;
+ rcu_assign_pointer(ibp->qp1, qp);
else {
qp->next = dev->qp_table[n];
- dev->qp_table[n] = qp;
+ rcu_assign_pointer(dev->qp_table[n], qp);
}
- atomic_inc(&qp->refcount);
spin_unlock_irqrestore(&dev->qpt_lock, flags);
+ synchronize_rcu();
}
/*
@@ -236,29 +245,32 @@ static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
{
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
- struct qib_qp *q, **qpp;
+ unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
unsigned long flags;
- qpp = &dev->qp_table[qp->ibqp.qp_num % dev->qp_table_size];
-
spin_lock_irqsave(&dev->qpt_lock, flags);
if (ibp->qp0 == qp) {
- ibp->qp0 = NULL;
atomic_dec(&qp->refcount);
+ rcu_assign_pointer(ibp->qp0, NULL);
} else if (ibp->qp1 == qp) {
- ibp->qp1 = NULL;
atomic_dec(&qp->refcount);
- } else
+ rcu_assign_pointer(ibp->qp1, NULL);
+ } else {
+ struct qib_qp *q, **qpp;
+
+ qpp = &dev->qp_table[n];
for (; (q = *qpp) != NULL; qpp = &q->next)
if (q == qp) {
- *qpp = qp->next;
- qp->next = NULL;
atomic_dec(&qp->refcount);
+ rcu_assign_pointer(*qpp, qp->next);
+ qp->next = NULL;
break;
}
+ }
spin_unlock_irqrestore(&dev->qpt_lock, flags);
+ synchronize_rcu();
}
/**
@@ -280,21 +292,24 @@ unsigned qib_free_all_qps(struct qib_devdata *dd)
if (!qib_mcast_tree_empty(ibp))
qp_inuse++;
- if (ibp->qp0)
+ rcu_read_lock();
+ if (rcu_dereference(ibp->qp0))
qp_inuse++;
- if (ibp->qp1)
+ if (rcu_dereference(ibp->qp1))
qp_inuse++;
+ rcu_read_unlock();
}
spin_lock_irqsave(&dev->qpt_lock, flags);
for (n = 0; n < dev->qp_table_size; n++) {
qp = dev->qp_table[n];
- dev->qp_table[n] = NULL;
+ rcu_assign_pointer(dev->qp_table[n], NULL);
for (; qp; qp = qp->next)
qp_inuse++;
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
+ synchronize_rcu();
return qp_inuse;
}
@@ -309,25 +324,28 @@ unsigned qib_free_all_qps(struct qib_devdata *dd)
*/
struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
{
- struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
- unsigned long flags;
- struct qib_qp *qp;
+ struct qib_qp *qp = NULL;
- spin_lock_irqsave(&dev->qpt_lock, flags);
+ if (unlikely(qpn <= 1)) {
+ rcu_read_lock();
+ if (qpn == 0)
+ qp = rcu_dereference(ibp->qp0);
+ else
+ qp = rcu_dereference(ibp->qp1);
+ } else {
+ struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
+ unsigned n = qpn_hash(dev, qpn);
- if (qpn == 0)
- qp = ibp->qp0;
- else if (qpn == 1)
- qp = ibp->qp1;
- else
- for (qp = dev->qp_table[qpn % dev->qp_table_size]; qp;
- qp = qp->next)
+ rcu_read_lock();
+ for (qp = dev->qp_table[n]; rcu_dereference(qp); qp = qp->next)
if (qp->ibqp.qp_num == qpn)
break;
+ }
if (qp)
- atomic_inc(&qp->refcount);
+ if (unlikely(!atomic_inc_not_zero(&qp->refcount)))
+ qp = NULL;
- spin_unlock_irqrestore(&dev->qpt_lock, flags);
+ rcu_read_unlock();
return qp;
}
@@ -765,8 +783,10 @@ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
}
}
- if (attr_mask & IB_QP_PATH_MTU)
+ if (attr_mask & IB_QP_PATH_MTU) {
qp->path_mtu = pmtu;
+ qp->pmtu = ib_mtu_enum_to_int(pmtu);
+ }
if (attr_mask & IB_QP_RETRY_CNT) {
qp->s_retry_cnt = attr->retry_cnt;
@@ -781,8 +801,12 @@ int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
if (attr_mask & IB_QP_MIN_RNR_TIMER)
qp->r_min_rnr_timer = attr->min_rnr_timer;
- if (attr_mask & IB_QP_TIMEOUT)
+ if (attr_mask & IB_QP_TIMEOUT) {
qp->timeout = attr->timeout;
+ qp->timeout_jiffies =
+ usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
+ 1000UL);
+ }
if (attr_mask & IB_QP_QKEY)
qp->qkey = attr->qkey;
@@ -1013,6 +1037,10 @@ struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
ret = ERR_PTR(-ENOMEM);
goto bail_swq;
}
+ RCU_INIT_POINTER(qp->next, NULL);
+ qp->timeout_jiffies =
+ usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
+ 1000UL);
if (init_attr->srq)
sz = 0;
else {