diff options
| author | Eli Cohen <eli@mellanox.com> | 2017-01-03 23:55:24 +0200 |
|---|---|---|
| committer | Saeed Mahameed <saeedm@mellanox.com> | 2017-01-09 20:24:55 +0200 |
| commit | 0118717583cda6f4f36092853ad0345e8150b286 (patch) | |
| tree | 2abb26bf5a267973ebe6b2d48af0faa5ce340cd7 /drivers/net/ethernet/mellanox/mlx5/core/uar.c | |
| parent | a6d51b68611e98f05042ada662aed5dbe3279c1e (diff) | |
net/mlx5: Add interface to get reference to a UAR
A reference to a UAR is required to generate CQ or EQ doorbells. Since
CQ or EQ doorbells can all be generated using the same UAR area without
any effect on performance, we are just getting a reference to any
available UAR, If one is not available we allocate it but we don't waste
the blue flame registers it can provide and we will use them for
subsequent allocations.
We get a reference to such UAR and put in mlx5_priv so any kernel
consumer can make use of it.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/uar.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/uar.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/uar.c b/drivers/net/ethernet/mellanox/mlx5/core/uar.c index 6a081a8787a7..fcc0270ea72f 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/uar.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/uar.c @@ -332,6 +332,38 @@ error1: return ERR_PTR(err); } +struct mlx5_uars_page *mlx5_get_uars_page(struct mlx5_core_dev *mdev) +{ + struct mlx5_uars_page *ret; + + mutex_lock(&mdev->priv.bfregs.reg_head.lock); + if (list_empty(&mdev->priv.bfregs.reg_head.list)) { + ret = alloc_uars_page(mdev, false); + if (IS_ERR(ret)) { + ret = NULL; + goto out; + } + list_add(&ret->list, &mdev->priv.bfregs.reg_head.list); + } else { + ret = list_first_entry(&mdev->priv.bfregs.reg_head.list, + struct mlx5_uars_page, list); + kref_get(&ret->ref_count); + } +out: + mutex_unlock(&mdev->priv.bfregs.reg_head.lock); + + return ret; +} +EXPORT_SYMBOL(mlx5_get_uars_page); + +void mlx5_put_uars_page(struct mlx5_core_dev *mdev, struct mlx5_uars_page *up) +{ + mutex_lock(&mdev->priv.bfregs.reg_head.lock); + kref_put(&up->ref_count, up_rel_func); + mutex_unlock(&mdev->priv.bfregs.reg_head.lock); +} +EXPORT_SYMBOL(mlx5_put_uars_page); + static unsigned long map_offset(struct mlx5_core_dev *mdev, int dbi) { /* return the offset in bytes from the start of the page to the |