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RDMA/mlx5: Replace spinlock protected write with atomic var

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mkey variant calculation was spinlock protected to make it atomic, replace
that with one atomic variable.

Link: https://lore.kernel.org/r/20200310082238.239865-4-leon@kernel.org
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Saeed Mahameed 2020-03-10 10:22:29 +02:00 committed by Jason Gunthorpe
parent a3cfdd3928
commit f743ff3b37
3 changed files with 3 additions and 10 deletions
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2
drivers/infiniband/hw/mlx5/main.c
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@ -6390,7 +6390,7 @@ static int mlx5_ib_stage_init_init(struct mlx5_ib_dev *dev)
spin_lock_init(&dev->reset_flow_resource_lock);
xa_init(&dev->odp_mkeys);
xa_init(&dev->sig_mrs);
spin_lock_init(&dev->mkey_lock);
atomic_set(&dev->mkey_var, 0);
spin_lock_init(&dev->dm.lock);
dev->dm.dev = mdev;

5
drivers/infiniband/hw/mlx5/mlx5_ib.h
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@ -993,10 +993,7 @@ struct mlx5_ib_dev {
*/
struct mlx5_ib_resources devr;
/* protect mkey key part */
spinlock_t mkey_lock;
u8 mkey_key;
atomic_t mkey_var;
struct mlx5_mr_cache cache;
struct timer_list delay_timer;
/* Prevents soft lock on massive reg MRs */

6
drivers/infiniband/hw/mlx5/mr.c
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@ -54,12 +54,8 @@ static void
assign_mkey_variant(struct mlx5_ib_dev *dev, struct mlx5_core_mkey *mkey,
u32 *in)
{
u8 key = atomic_inc_return(&dev->mkey_var);
void *mkc;
u8 key;
spin_lock_irq(&dev->mkey_lock);
key = dev->mkey_key++;
spin_unlock_irq(&dev->mkey_lock);
mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
MLX5_SET(mkc, mkc, mkey_7_0, key);