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mlx4_core: Implement SRQ object lookup from srqn

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Expose a new API mlx4_srq_lookup() to retrive a SRQ based on its
number.  This API is needed in the mlx4_ib driver CQ polling logic,
when a work completion is associated with a XRC TGT QP.  Since a
target QP may redirect to more than one XRC SRQ, the srq field in the
QP has no usage and the real XRC SRQ need to be retrived using the
information from the XRCETH IB header which is placed in the HW CQE.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Shlomo Pongratz 2013-04-10 14:26:47 +00:00 committed by Roland Dreier
parent eec9e29fc5
commit 9f550553a4
2 changed files with 17 additions and 0 deletions
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15
drivers/net/ethernet/mellanox/mlx4/srq.c
View File

@ -298,3 +298,18 @@ void mlx4_cleanup_srq_table(struct mlx4_dev *dev)
return;
mlx4_bitmap_cleanup(&mlx4_priv(dev)->srq_table.bitmap);
}
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);
srq = radix_tree_lookup(&srq_table->tree,
srqn & (dev->caps.num_srqs - 1));
spin_unlock_irqrestore(&srq_table->lock, flags);
return srq;
}
EXPORT_SYMBOL_GPL(mlx4_srq_lookup);

2
include/linux/mlx4/srq.h
View File

@ -39,4 +39,6 @@ struct mlx4_wqe_srq_next_seg {
u32 reserved2[3];
};
struct mlx4_srq *mlx4_srq_lookup(struct mlx4_dev *dev, u32 srqn);
#endif /* MLX4_SRQ_H */