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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: Moni Shoua <monis@mellanox.com> Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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2 changed files with 38 additions and 1 deletions
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@ -167,6 +167,12 @@ static int __mlx4_qp_modify(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
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context->log_page_size = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
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}
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if ((cur_state == MLX4_QP_STATE_RTR) &&
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(new_state == MLX4_QP_STATE_RTS) &&
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dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_ROCE_V1_V2)
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context->roce_entropy =
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cpu_to_be16(mlx4_qp_roce_entropy(dev, qp->qpn));
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*(__be32 *) mailbox->buf = cpu_to_be32(optpar);
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memcpy(mailbox->buf + 8, context, sizeof *context);
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@ -921,3 +927,23 @@ int mlx4_qp_to_ready(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
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return 0;
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}
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EXPORT_SYMBOL_GPL(mlx4_qp_to_ready);
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u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn)
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{
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struct mlx4_qp_context context;
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struct mlx4_qp qp;
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int err;
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qp.qpn = qpn;
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err = mlx4_qp_query(dev, &qp, &context);
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if (!err) {
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u32 dest_qpn = be32_to_cpu(context.remote_qpn) & 0xffffff;
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u16 folded_dst = folded_qp(dest_qpn);
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u16 folded_src = folded_qp(qpn);
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return (dest_qpn != qpn) ?
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((folded_dst ^ folded_src) | 0xC000) :
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folded_src | 0xC000;
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}
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return 0xdead;
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}
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@ -204,7 +204,8 @@ struct mlx4_qp_context {
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u32 reserved1;
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__be32 next_send_psn;
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__be32 cqn_send;
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u32 reserved2[2];
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__be16 roce_entropy;
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__be16 reserved2[3];
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__be32 last_acked_psn;
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__be32 ssn;
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__be32 params2;
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@ -487,4 +488,14 @@ static inline struct mlx4_qp *__mlx4_qp_lookup(struct mlx4_dev *dev, u32 qpn)
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void mlx4_qp_remove(struct mlx4_dev *dev, struct mlx4_qp *qp);
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static inline u16 folded_qp(u32 q)
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{
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u16 res;
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res = ((q & 0xff) ^ ((q & 0xff0000) >> 16)) | (q & 0xff00);
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return res;
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}
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u16 mlx4_qp_roce_entropy(struct mlx4_dev *dev, u32 qpn);
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#endif /* MLX4_QP_H */
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