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net/mlx4_core: Use RCU to perform radix tree lookup for SRQ

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Radix tree lookup can be performed without locking.

Fixes: 225c7b1fee ("IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Suggested-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Leon Romanovsky 2016-09-20 14:39:41 +03:00 committed by David S. Miller
parent 57c970c2e8
commit 30353bfc43
1 changed files with 5 additions and 9 deletions
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14
drivers/net/ethernet/mellanox/mlx4/srq.c
View file

@ -45,15 +45,12 @@ void mlx4_srq_event(struct mlx4_dev *dev, u32 srqn, int event_type)
struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
struct mlx4_srq *srq;
spin_lock(&srq_table->lock);
rcu_read_lock();
srq = radix_tree_lookup(&srq_table->tree, srqn & (dev->caps.num_srqs - 1));
rcu_read_unlock();
if (srq)
atomic_inc(&srq->refcount);
spin_unlock(&srq_table->lock);
if (!srq) {
else {
mlx4_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
return;
}
@ -301,12 +298,11 @@ struct mlx4_srq *mlx4_srq_lookup(struct mlx4_dev *dev, u32 srqn)
{
struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
struct mlx4_srq *srq;
unsigned long flags;
spin_lock_irqsave(&srq_table->lock, flags);
rcu_read_lock();
srq = radix_tree_lookup(&srq_table->tree,
srqn & (dev->caps.num_srqs - 1));
spin_unlock_irqrestore(&srq_table->lock, flags);
rcu_read_unlock();
return srq;
}