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authorBryan O'Sullivan <bos@pathscale.com>2007-03-15 14:45:12 -0700
committerRoland Dreier <rolandd@cisco.com>2007-04-18 20:20:59 -0700
commit662af5813be9aadf95ca310b7b6d1d37070c9922 (patch)
tree1ed1454f49c7699e39e840ccfad03af31ba8dee8 /drivers/infiniband
parent53c1d2c943a67fb129ed2797182305a4633531fb (diff)
downloadop-kernel-dev-662af5813be9aadf95ca310b7b6d1d37070c9922.zip
op-kernel-dev-662af5813be9aadf95ca310b7b6d1d37070c9922.tar.gz
IB/ipath: Don't allow QPs 0 and 1 to be opened multiple times
Signed-off-by: Robert Walsh <robert.walsh@qlogic.com> Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_qp.c91
1 files changed, 53 insertions, 38 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index f671fd0..16db9ac 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c
@@ -81,11 +81,51 @@ static u32 credit_table[31] = {
32768 /* 1E */
};
-static u32 alloc_qpn(struct ipath_qp_table *qpt)
+
+static void get_map_page(struct ipath_qp_table *qpt, struct qpn_map *map)
+{
+ unsigned long page = get_zeroed_page(GFP_KERNEL);
+ unsigned long flags;
+
+ /*
+ * Free the page if someone raced with us installing it.
+ */
+
+ spin_lock_irqsave(&qpt->lock, flags);
+ if (map->page)
+ free_page(page);
+ else
+ map->page = (void *)page;
+ spin_unlock_irqrestore(&qpt->lock, flags);
+}
+
+
+static int alloc_qpn(struct ipath_qp_table *qpt, enum ib_qp_type type)
{
u32 i, offset, max_scan, qpn;
struct qpn_map *map;
- u32 ret;
+ u32 ret = -1;
+
+ if (type == IB_QPT_SMI)
+ ret = 0;
+ else if (type == IB_QPT_GSI)
+ ret = 1;
+
+ if (ret != -1) {
+ map = &qpt->map[0];
+ if (unlikely(!map->page)) {
+ get_map_page(qpt, map);
+ if (unlikely(!map->page)) {
+ ret = -ENOMEM;
+ goto bail;
+ }
+ }
+ if (!test_and_set_bit(ret, map->page))
+ atomic_dec(&map->n_free);
+ else
+ ret = -EBUSY;
+ goto bail;
+ }
qpn = qpt->last + 1;
if (qpn >= QPN_MAX)
@@ -95,19 +135,7 @@ static u32 alloc_qpn(struct ipath_qp_table *qpt)
max_scan = qpt->nmaps - !offset;
for (i = 0;;) {
if (unlikely(!map->page)) {
- unsigned long page = get_zeroed_page(GFP_KERNEL);
- unsigned long flags;
-
- /*
- * Free the page if someone raced with us
- * installing it:
- */
- spin_lock_irqsave(&qpt->lock, flags);
- if (map->page)
- free_page(page);
- else
- map->page = (void *)page;
- spin_unlock_irqrestore(&qpt->lock, flags);
+ get_map_page(qpt, map);
if (unlikely(!map->page))
break;
}
@@ -151,7 +179,7 @@ static u32 alloc_qpn(struct ipath_qp_table *qpt)
qpn = mk_qpn(qpt, map, offset);
}
- ret = 0;
+ ret = -ENOMEM;
bail:
return ret;
@@ -180,29 +208,19 @@ static int ipath_alloc_qpn(struct ipath_qp_table *qpt, struct ipath_qp *qp,
enum ib_qp_type type)
{
unsigned long flags;
- u32 qpn;
int ret;
- if (type == IB_QPT_SMI)
- qpn = 0;
- else if (type == IB_QPT_GSI)
- qpn = 1;
- else {
- /* Allocate the next available QPN */
- qpn = alloc_qpn(qpt);
- if (qpn == 0) {
- ret = -ENOMEM;
- goto bail;
- }
- }
- qp->ibqp.qp_num = qpn;
+ ret = alloc_qpn(qpt, type);
+ if (ret < 0)
+ goto bail;
+ qp->ibqp.qp_num = ret;
/* Add the QP to the hash table. */
spin_lock_irqsave(&qpt->lock, flags);
- qpn %= qpt->max;
- qp->next = qpt->table[qpn];
- qpt->table[qpn] = qp;
+ ret %= qpt->max;
+ qp->next = qpt->table[ret];
+ qpt->table[ret] = qp;
atomic_inc(&qp->refcount);
spin_unlock_irqrestore(&qpt->lock, flags);
@@ -245,9 +263,7 @@ static void ipath_free_qp(struct ipath_qp_table *qpt, struct ipath_qp *qp)
if (!fnd)
return;
- /* If QPN is not reserved, mark QPN free in the bitmap. */
- if (qp->ibqp.qp_num > 1)
- free_qpn(qpt, qp->ibqp.qp_num);
+ free_qpn(qpt, qp->ibqp.qp_num);
wait_event(qp->wait, !atomic_read(&qp->refcount));
}
@@ -270,8 +286,7 @@ void ipath_free_all_qps(struct ipath_qp_table *qpt)
while (qp) {
nqp = qp->next;
- if (qp->ibqp.qp_num > 1)
- free_qpn(qpt, qp->ibqp.qp_num);
+ free_qpn(qpt, qp->ibqp.qp_num);
if (!atomic_dec_and_test(&qp->refcount) ||
!ipath_destroy_qp(&qp->ibqp))
ipath_dbg("QP memory leak!\n");
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