On Sun, Aug 16, 2015 at 07:05:30PM +0300, Eran Ben Elisha wrote:
> From: Maor Gottlieb <ma...@mellanox.com>
>
> Set the mcast loopback prevention bit in the QPC for ETH MLX QPs (not
> RSS QPs), when the firmware supports this feature. In addition, all rx
> ring QPs need to be updated in order not to enforce loopback checks.
> This prevents getting packets we sent both from the network stack and
> the HCA. Loopback prevention is done by comparing the counter indices of
> the sent and receiving QPs. If they're equal, packets aren't
> loopback-ed.
>
> Signed-off-by: Maor Gottlieb <ma...@mellanox.com>
> Signed-off-by: Eran Ben Elisha <era...@mellanox.com>
> ---
> drivers/net/ethernet/mellanox/mlx4/en_main.c | 22 ++++++++++++++++++++
> drivers/net/ethernet/mellanox/mlx4/en_resources.c | 25
> +++++++++++++++++++++++
> drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 ++-
> 3 files changed, 49 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c
> b/drivers/net/ethernet/mellanox/mlx4/en_main.c
> index a946e4b..70e381a 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c
> @@ -123,6 +123,28 @@ void mlx4_en_update_loopback_state(struct net_device
> *dev,
> */
> if (mlx4_is_mfunc(priv->mdev->dev) || priv->validate_loopback)
> priv->flags |= MLX4_EN_FLAG_ENABLE_HW_LOOPBACK;
> +
> + mutex_lock(&priv->mdev->state_lock);
> + if (priv->mdev->dev->caps.flags2 &
> + MLX4_DEV_CAP_FLAG2_UPDATE_QP_SRC_CHECK_LB &&
> + priv->rss_map.indir_qp.qpn) {
> + int i;
> + int err = 0;
> +
> + for (i = 0; i < priv->rx_ring_num; i++) {
> + int ret;
> +
> + ret = mlx4_en_change_mcast_lb(priv,
> + &priv->rss_map.qps[i],
> + !!(features &
> + NETIF_F_LOOPBACK));
If "feature" is not changing inside the loop can we take it out just for
the code to look more readable?
> + if (!err)
> + err = ret;
> + }
> + if (err)
> + mlx4_warn(priv->mdev, "failed to change mcast
> loopback\n");
> + }
> + mutex_unlock(&priv->mdev->state_lock);
> }
>
> static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
> diff --git a/drivers/net/ethernet/mellanox/mlx4/en_resources.c
> b/drivers/net/ethernet/mellanox/mlx4/en_resources.c
> index e482fa1b..12aab5a 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/en_resources.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/en_resources.c
> @@ -69,6 +69,15 @@ void mlx4_en_fill_qp_context(struct mlx4_en_priv *priv,
> int size, int stride,
> context->pri_path.counter_index = priv->counter_index;
> context->cqn_send = cpu_to_be32(cqn);
> context->cqn_recv = cpu_to_be32(cqn);
> + if (!rss &&
> + (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_LB_SRC_CHK) &&
> + context->pri_path.counter_index !=
> + MLX4_SINK_COUNTER_INDEX(mdev->dev)) {
> + /* disable multicast loopback to qp with same counter */
> + if (!(dev->features & NETIF_F_LOOPBACK))
> + context->pri_path.fl |= MLX4_FL_ETH_SRC_CHECK_MC_LB;
> + context->pri_path.control |= MLX4_CTRL_ETH_SRC_CHECK_IF_COUNTER;
> + }
> context->db_rec_addr = cpu_to_be64(priv->res.db.dma << 2);
> if (!(dev->features & NETIF_F_HW_VLAN_CTAG_RX))
> context->param3 |= cpu_to_be32(1 << 30);
> @@ -80,6 +89,22 @@ void mlx4_en_fill_qp_context(struct mlx4_en_priv *priv,
> int size, int stride,
> }
> }
>
> +int mlx4_en_change_mcast_lb(struct mlx4_en_priv *priv, struct mlx4_qp *qp,
> + int loopback)
> +{
> + int ret;
> + struct mlx4_update_qp_params qp_params;
> +
> + memset(&qp_params, 0, sizeof(qp_params));
> + if (!loopback)
> + qp_params.flags = MLX4_UPDATE_QP_PARAMS_FLAGS_ETH_CHECK_MC_LB;
> +
> + ret = mlx4_update_qp(priv->mdev->dev, qp->qpn,
> + MLX4_UPDATE_QP_ETH_SRC_CHECK_MC_LB,
> + &qp_params);
> +
> + return ret;
> +}
>
> int mlx4_en_map_buffer(struct mlx4_buf *buf)
> {
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index 666d166..7db86d4 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -797,7 +797,8 @@ void mlx4_en_fill_qp_context(struct mlx4_en_priv *priv,
> int size, int stride,
> void mlx4_en_sqp_event(struct mlx4_qp *qp, enum mlx4_event event);
> int mlx4_en_map_buffer(struct mlx4_buf *buf);
> void mlx4_en_unmap_buffer(struct mlx4_buf *buf);
> -
> +int mlx4_en_change_mcast_lb(struct mlx4_en_priv *priv, struct mlx4_qp *qp,
> + int loopback);
> void mlx4_en_calc_rx_buf(struct net_device *dev);
> int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv);
> void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv);
> --
> 1.8.3.1
>
> --
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