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net/mlx4_en: Implement mcast loopback prevention for ETH qps 

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 <maorg@mellanox.com>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Maor Gottlieb 2015-10-15 14:44:39 +03:00 committed by Doug Ledford
parent 9a89283597
commit 74194fb9c8
3 changed files with 49 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/net/ethernet/mellanox/mlx4/en_main.c
View File

@ -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;
int loopback = !!(features & NETIF_F_LOOPBACK);
for (i = 0; i < priv->rx_ring_num; i++) {
int ret;
ret = mlx4_en_change_mcast_lb(priv,
&priv->rss_map.qps[i],
loopback);
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)

25
drivers/net/ethernet/mellanox/mlx4/en_resources.c
View File

@ -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)
{

3
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -798,7 +798,8 @@ 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);