diff mbox series

[net,09/16] net/mlx5e: reset XPS on error flow if netdev isn't registered yet

Message ID 20210519060523.17875-10-saeed@kernel.org (mailing list archive)
State Accepted
Commit 77ecd10d0a8aaa6e4871d8c63626e4c9fc5e47db
Delegated to: Netdev Maintainers
Headers show
Series [net,01/16] {net, RDMA}/mlx5: Fix override of log_max_qp by other device | expand

Checks

Context Check Description
netdev/cover_letter success Pull request
netdev/fixes_present success Link
netdev/patch_count warning Series longer than 15 patches
netdev/tree_selection success Clearly marked for net
netdev/subject_prefix success Link
netdev/cc_maintainers fail 2 blamed authors not CCed: maximmi@mellanox.com tariqt@mellanox.com; 4 maintainers not CCed: maximmi@mellanox.com tariqt@mellanox.com linux-rdma@vger.kernel.org leon@kernel.org
netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 25 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
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Commit Message

Saeed Mahameed May 19, 2021, 6:05 a.m. UTC 
From: Saeed Mahameed <saeedm@nvidia.com>

mlx5e_attach_netdev can be called prior to registering the netdevice:
Example stack:

ipoib_new_child_link ->
ipoib_intf_init->
rdma_init_netdev->
mlx5_rdma_setup_rn->

mlx5e_attach_netdev->
mlx5e_num_channels_changed ->
mlx5e_set_default_xps_cpumasks ->
netif_set_xps_queue ->
__netif_set_xps_queue -> kmalloc

If any later stage fails at any point after mlx5e_num_channels_changed()
returns, XPS allocated maps will never be freed as they
are only freed during netdev unregistration, which will never happen for
yet to be registered netdevs.

Fixes: 3909a12e7913 ("net/mlx5e: Fix configuration of XPS cpumasks and netdev queues in corner cases")
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index bca832cdc4cb..89937b055070 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -5229,6 +5229,11 @@  static void mlx5e_update_features(struct net_device *netdev)
 	rtnl_unlock();
 }
 
+static void mlx5e_reset_channels(struct net_device *netdev)
+{
+	netdev_reset_tc(netdev);
+}
+
 int mlx5e_attach_netdev(struct mlx5e_priv *priv)
 {
 	const bool take_rtnl = priv->netdev->reg_state == NETREG_REGISTERED;
@@ -5283,6 +5288,7 @@  int mlx5e_attach_netdev(struct mlx5e_priv *priv)
 	profile->cleanup_tx(priv);
 
 out:
+	mlx5e_reset_channels(priv->netdev);
 	set_bit(MLX5E_STATE_DESTROYING, &priv->state);
 	cancel_work_sync(&priv->update_stats_work);
 	return err;
@@ -5300,6 +5306,7 @@  void mlx5e_detach_netdev(struct mlx5e_priv *priv)
 
 	profile->cleanup_rx(priv);
 	profile->cleanup_tx(priv);
+	mlx5e_reset_channels(priv->netdev);
 	cancel_work_sync(&priv->update_stats_work);
 }