net/mlx5e: IPoIB, Block queue count configuration when sub interfaces are present

PKEY sub interfaces share the receive queues with the parent interface.
While setting the sub interface queue count is not supported, it is
currently possible to change the number of queues of the parent interface.
Thus we can end up with inconsistent queue sizes between the parent and its
sub interfaces.

This change disallows setting the queue count on the parent interface when
sub interfaces are present.

This is achieved by introducing an explicit reference to the parent netdev
in the mlx5i_priv of the child interface. An additional counter is also
required on the parent side to detect when sub interfaces are attached and
for proper cleanup.

The rtnl lock is taken during the ethtool op and the sub interface
ndo_init/uninit ops. There is no race here around counting the sub
interfaces, reading the sub interfaces and setting the number of
channels. The ASSERT_RTNL was added to document that.

Fixes: be98737a4faa ("net/mlx5e: Use dynamic per-channel allocations in stats")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c
index 2c73c8445e63..911cf4d23964 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c
@@ -160,6 +160,44 @@ void mlx5i_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
 	stats->tx_dropped = sstats->tx_queue_dropped;
 }
 
+struct net_device *mlx5i_parent_get(struct net_device *netdev)
+{
+	struct mlx5e_priv *priv = mlx5i_epriv(netdev);
+	struct mlx5i_priv *ipriv, *parent_ipriv;
+	struct net_device *parent_dev;
+	int parent_ifindex;
+
+	ipriv = priv->ppriv;
+
+	parent_ifindex = netdev->netdev_ops->ndo_get_iflink(netdev);
+	parent_dev = dev_get_by_index(dev_net(netdev), parent_ifindex);
+	if (!parent_dev)
+		return NULL;
+
+	parent_ipriv = netdev_priv(parent_dev);
+
+	ASSERT_RTNL();
+	parent_ipriv->num_sub_interfaces++;
+
+	ipriv->parent_dev = parent_dev;
+
+	return parent_dev;
+}
+
+void mlx5i_parent_put(struct net_device *netdev)
+{
+	struct mlx5e_priv *priv = mlx5i_epriv(netdev);
+	struct mlx5i_priv *ipriv, *parent_ipriv;
+
+	ipriv = priv->ppriv;
+	parent_ipriv = netdev_priv(ipriv->parent_dev);
+
+	ASSERT_RTNL();
+	parent_ipriv->num_sub_interfaces--;
+
+	dev_put(ipriv->parent_dev);
+}
+
 int mlx5i_init_underlay_qp(struct mlx5e_priv *priv)
 {
 	struct mlx5_core_dev *mdev = priv->mdev;