linux-kernel - Re: [PATCH v2] net/mlx5e: Use kvfree() in mlx5e_accel_fs_tcp

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Date:   Tue, 8 Nov 2022 11:45:04 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Tariq Toukan <ttoukan.linux@...il.com>
Cc:     YueHaibing <yuehaibing@...wei.com>, borisp@...dia.com,
        saeedm@...dia.com, leon@...nel.org, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, lkayal@...dia.com,
        tariqt@...dia.com, markzhang@...dia.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net/mlx5e: Use kvfree() in mlx5e_accel_fs_tcp_create()

On Tue, Nov 8, 2022 at 9:58 AM Tariq Toukan <ttoukan.linux@...il.com> wrote:
>
>
>
> On 11/8/2022 4:06 PM, YueHaibing wrote:
> > 'accel_tcp' is allocted by kvzalloc(), which should freed by kvfree().
> >
> > Fixes: f52f2faee581 ("net/mlx5e: Introduce flow steering API")
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> > v2: fix the same issue in mlx5e_accel_fs_tcp_destroy() and a commit log typo
> > ---
> >   drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
> > index 285d32d2fd08..d7c020f72401 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
> > @@ -365,7 +365,7 @@ void mlx5e_accel_fs_tcp_destroy(struct mlx5e_flow_steering *fs)
> >       for (i = 0; i < ACCEL_FS_TCP_NUM_TYPES; i++)
> >               accel_fs_tcp_destroy_table(fs, i);
> >
> > -     kfree(accel_tcp);
> > +     kvfree(accel_tcp);
> >       mlx5e_fs_set_accel_tcp(fs, NULL);
> >   }
> >
> > @@ -397,7 +397,7 @@ int mlx5e_accel_fs_tcp_create(struct mlx5e_flow_steering *fs)
> >   err_destroy_tables:
> >       while (--i >= 0)
> >               accel_fs_tcp_destroy_table(fs, i);
> > -     kfree(accel_tcp);
> > +     kvfree(accel_tcp);
> >       mlx5e_fs_set_accel_tcp(fs, NULL);
> >       return err;
> >   }
>
> Reviewed-by: Tariq Toukan <tariqt@...dia.com>
>
> Thanks for your patch.

Although this structure is 64 bytes... Not sure why kvmalloc() has
been used for this small chunk.