mlx4_core: Implement SRQ object lookup from srqn (9f550553) · Commits · 戴 / test

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>

drivers/net/ethernet/mellanox/mlx4/srq.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -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);

include/linux/mlx4/srq.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 */

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