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net/mlx4_core: Add support for RoCE v2 entropy

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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>
This commit is contained in:
Moni Shoua 2016-01-14 17:50:37 +02:00 committed by Doug Ledford
parent fca8300629
commit 3f723f42d9
2 changed files with 38 additions and 1 deletions
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26
drivers/net/ethernet/mellanox/mlx4/qp.c
View File

@ -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;
}

13
include/linux/mlx4/qp.h
View File

@ -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 */