Remove semaphore umr_common:sem used to limit concurrent access to umr qp
and introduce an atomic value 'users' to keep track of the same. Use a
wait_event to block when the limit is reached.
Signed-off-by: Binoy Jayan <binoy.jayan@xxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/main.c | 6 +-----
drivers/infiniband/hw/mlx5/mlx5_ib.h | 7 ++++++-
drivers/infiniband/hw/mlx5/mr.c | 6 ++++--
3 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 63036c7..9de716c 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2437,10 +2437,6 @@ static void destroy_umrc_res(struct mlx5_ib_dev *dev)
ib_dealloc_pd(dev->umrc.pd);
}
-enum {
- MAX_UMR_WR = 128,
-};
-
static int create_umr_res(struct mlx5_ib_dev *dev)
{
struct ib_qp_init_attr *init_attr = NULL;
@@ -2520,7 +2516,7 @@ static int create_umr_res(struct mlx5_ib_dev *dev)
dev->umrc.cq = cq;
dev->umrc.pd = pd;
- sema_init(&dev->umrc.sem, MAX_UMR_WR);
+ init_waitqueue_head(&dev->umrc.wq);
ret = mlx5_mr_cache_init(dev);
if (ret) {
mlx5_ib_warn(dev, "mr cache init failed %d\n", ret);
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index dcdcd19..de31b5f 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -533,7 +533,12 @@ struct umr_common {
struct ib_qp *qp;
/* control access to UMR QP
*/
- struct semaphore sem;
+ wait_queue_head_t wq;
+ atomic_t users;
+};
+
+enum {
+ MAX_UMR_WR = 128,
};
enum {
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 1593856..dfaf6f6 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -867,7 +867,8 @@ static inline int mlx5_ib_post_send_wait(struct mlx5_ib_dev *dev,
mlx5_ib_init_umr_context(&umr_context);
umrwr->wr.wr_cqe = &umr_context.cqe;
- down(&umrc->sem);
+ /* limit number of concurrent ib_post_send() on qp */
+ wait_event(umrc->wq, atomic_add_unless(&umrc->users, 1, MAX_UMR_WR));
err = ib_post_send(umrc->qp, &umrwr->wr, &bad);
if (err) {
mlx5_ib_warn(dev, "UMR post send failed, err %d\n", err);
@@ -879,7 +880,8 @@ static inline int mlx5_ib_post_send_wait(struct mlx5_ib_dev *dev,
err = -EFAULT;
}
}
- up(&umrc->sem);
+ atomic_dec(&umrc->users);
+ wake_up(&umrc->wq);
return err;
}
--
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