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net/mlx4_core: Use RCU to perform radix tree lookup for SRQ
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:
parent
57c970c2e8
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@ -45,15 +45,12 @@ void mlx4_srq_event(struct mlx4_dev *dev, u32 srqn, int event_type)
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struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
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struct mlx4_srq *srq;
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spin_lock(&srq_table->lock);
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rcu_read_lock();
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srq = radix_tree_lookup(&srq_table->tree, srqn & (dev->caps.num_srqs - 1));
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rcu_read_unlock();
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if (srq)
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atomic_inc(&srq->refcount);
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spin_unlock(&srq_table->lock);
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if (!srq) {
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else {
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mlx4_warn(dev, "Async event for bogus SRQ %08x\n", srqn);
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return;
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}
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@ -301,12 +298,11 @@ struct mlx4_srq *mlx4_srq_lookup(struct mlx4_dev *dev, u32 srqn)
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{
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struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
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struct mlx4_srq *srq;
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unsigned long flags;
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spin_lock_irqsave(&srq_table->lock, flags);
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rcu_read_lock();
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srq = radix_tree_lookup(&srq_table->tree,
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srqn & (dev->caps.num_srqs - 1));
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spin_unlock_irqrestore(&srq_table->lock, flags);
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rcu_read_unlock();
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return srq;
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}
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