IB/mlx4: Utilize macro to calculate SQ spare size
The macro MLX4_IB_SQ_HEADROOM calculates the spare room needed to be left. Use it instead of hard-coding the HW prefetch size. Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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@ -401,7 +401,7 @@ static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
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* We need to leave 2 KB + 1 WR of headroom in the SQ to
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* allow HW to prefetch.
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*/
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qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + 1;
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qp->sq_spare_wqes = MLX4_IB_SQ_HEADROOM(qp->sq.wqe_shift);
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qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr +
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qp->sq_spare_wqes);
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