Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3f723f42 authored by Moni Shoua's avatar Moni Shoua Committed by Doug Ledford
Browse files

net/mlx4_core: Add support for RoCE v2 entropy 



In RoCE v2 we need to choose a source UDP port, we do so by using
entropy over the source and dest QPNs.

Signed-off-by: default avatarMoni Shoua <monis@mellanox.com>
Signed-off-by: default avatarMatan Barak <matanb@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent fca83006

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

+26 −0
Original line number Diff line number Diff line
@@ -167,6 +167,12 @@ static int __mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt, 
		context->log_page_size   = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;

	}



	if ((cur_state == MLX4_QP_STATE_RTR) &&

	    (new_state == MLX4_QP_STATE_RTS) &&

	    dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_ROCE_V1_V2)

		context->roce_entropy =

			cpu_to_be16(mlx4_qp_roce_entropy(dev, qp->qpn));



	*(__be32 *) mailbox->buf = cpu_to_be32(optpar);

	memcpy(mailbox->buf + 8, context, sizeof *context);
@@ -921,3 +927,23 @@ int mlx4_qp_to_ready(struct mlx4_dev *dev, struct mlx4_mtt *mtt, 
	return 0;

}

EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);



u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn)

{

	struct mlx4_qp_context context;

	struct mlx4_qp qp;

	int err;



	qp.qpn = qpn;

	err = mlx4_qp_query(dev, &qp, &context);

	if (!err) {

		u32 dest_qpn = be32_to_cpu(context.remote_qpn) & 0xffffff;

		u16 folded_dst = folded_qp(dest_qpn);

		u16 folded_src = folded_qp(qpn);



		return (dest_qpn != qpn) ?

			((folded_dst ^ folded_src) | 0xC000) :

			folded_src | 0xC000;

	}

	return 0xdead;

}

include/linux/mlx4/qp.h

+12 −1
Original line number Diff line number Diff line
@@ -204,7 +204,8 @@ struct mlx4_qp_context { 
	u32			reserved1;

	__be32			next_send_psn;

	__be32			cqn_send;

	u32			reserved2[2];

	__be16                  roce_entropy;

	__be16                  reserved2[3];

	__be32			last_acked_psn;

	__be32			ssn;

	__be32			params2;
@@ -487,4 +488,14 @@ static inline struct mlx4_qp *__mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn) 


void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp);



static inline u16 folded_qp(u32 q)

{

	u16 res;



	res = ((q & 0xff) ^ ((q & 0xff0000) >> 16)) | (q & 0xff00);

	return res;

}



u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn);



#endif /* MLX4_QP_H */