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Message-Id: <20230110061123.338427-8-saeed@kernel.org> Date: Mon, 9 Jan 2023 22:11:14 -0800 From: Saeed Mahameed <saeed@...nel.org> To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com> Cc: Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>, Dragos Tatulea <dtatulea@...dia.com> Subject: [net 07/16] net/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent From: Dragos Tatulea <dtatulea@...dia.com> A user is able to configure an arbitrary number of rx queues when creating an interface via netlink. This doesn't work for child PKEY interfaces because the child interface uses the parent receive channels. Although the child shares the parent's receive channels, the number of rx queues is important for the channel_stats array: the parent's rx channel index is used to access the child's channel_stats. So the array has to be at least as large as the parent's rx queue size for the counting to work correctly and to prevent out of bound accesses. This patch checks for the mentioned scenario and returns an error when trying to create the interface. The error is propagated to the user. Fixes: be98737a4faa ("net/mlx5e: Use dynamic per-channel allocations in stats") Signed-off-by: Dragos Tatulea <dtatulea@...dia.com> Reviewed-by: Tariq Toukan <tariqt@...dia.com> Signed-off-by: Saeed Mahameed <saeedm@...dia.com> --- .../net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c index 28795fb6bccc..03e681297937 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c @@ -168,6 +168,15 @@ static int mlx5i_pkey_dev_init(struct net_device *dev) return -EINVAL; } + if (dev->num_rx_queues < parent_dev->real_num_rx_queues) { + mlx5_core_warn(priv->mdev, + "failed to create child device with rx queues [%d] less than parent's [%d]\n", + dev->num_rx_queues, + parent_dev->real_num_rx_queues); + mlx5i_parent_put(dev); + return -EINVAL; + } + /* Get QPN to netdevice hash table from parent */ parent_ipriv = netdev_priv(parent_dev); ipriv->qpn_htbl = parent_ipriv->qpn_htbl; -- 2.39.0
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