linux-kernel - RE: [PATCH] net/mlx5: unique names for per device caches

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Message-ID:
 <IA0PR12MB8713EC167DC79275451864BADC6C2@IA0PR12MB8713.namprd12.prod.outlook.com>
Date: Fri, 20 Sep 2024 16:32:22 +0000
From: Parav Pandit <parav@...dia.com>
To: Sebastian Ott <sebott@...hat.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>
Subject: RE: [PATCH] net/mlx5: unique names for per device caches

Hi Sebastian,

> From: Sebastian Ott <sebott@...hat.com>
> Sent: Friday, September 20, 2024 8:04 PM
> 
> Add the pci device name to the per device kmem_cache names to ensure
> their uniqueness. This fixes warnings like this:
> "kmem_cache of name 'mlx5_fs_fgs' already exists".
> 
> Signed-off-by: Sebastian Ott <sebott@...hat.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/fs_core.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
> b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
> index 8505d5e241e1..5d54386a5669 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
> @@ -3689,6 +3689,7 @@ void mlx5_fs_core_free(struct mlx5_core_dev
> *dev)  int mlx5_fs_core_alloc(struct mlx5_core_dev *dev)  {
>  	struct mlx5_flow_steering *steering;
> +	char name[80];
>  	int err = 0;
> 
>  	err = mlx5_init_fc_stats(dev);
> @@ -3713,10 +3714,12 @@ int mlx5_fs_core_alloc(struct mlx5_core_dev
> *dev)
>  	else
>  		steering->mode = MLX5_FLOW_STEERING_MODE_DMFS;
> 
> -	steering->fgs_cache = kmem_cache_create("mlx5_fs_fgs",
> +	snprintf(name, sizeof(name), "%s-mlx5_fs_fgs", pci_name(dev-
> >pdev));
> +	steering->fgs_cache = kmem_cache_create(name,
>  						sizeof(struct
> mlx5_flow_group), 0,
>  						0, NULL);
> -	steering->ftes_cache = kmem_cache_create("mlx5_fs_ftes",
> sizeof(struct fs_fte), 0,
> +	snprintf(name, sizeof(name), "%s-mlx5_fs_ftes", pci_name(dev-
> >pdev));
> +	steering->ftes_cache = kmem_cache_create(name, sizeof(struct
> fs_fte),
> +0,
Mlx5 SFs are attached to the auxiliary bus. Hence, they will have duplicate name and this warning will persist.
Please change it to 
pci_name(dev->pdev) to dev_name(dev->device)

This will uniformly work for PF, VF and SF.

>  						 0, NULL);
>  	if (!steering->ftes_cache || !steering->fgs_cache) {
>  		err = -ENOMEM;
> --
> 2.42.0
>