netdev - Re: [PATCH] ucc_geth: Reset BQL queue when stopping device

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Date:   Mon, 28 Jan 2019 10:48:52 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Mathias Thore <mathias.thore@...inera.com>, leoyang.li@....com,
        netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        david.gounaris@...inera.com, joakim.tjernlund@...inera.com
Subject: Re: [PATCH] ucc_geth: Reset BQL queue when stopping device

Hi,

Le 28/01/2019 à 10:07, Mathias Thore a écrit :
> After a timeout event caused by for example a broadcast storm, when
> the MAC and PHY are reset, the BQL TX queue needs to be reset as
> well. Otherwise, the device will exhibit severe performance issues
> even after the storm has ended.

What are the symptomns ?

Is this reset needed on any network driver in that case, or is it 
something particular for the ucc_geth ?
For instance, the freescale fs_enet doesn't have that reset. Should it 
have it too ?

Christophe

> 
> Co-authored-by: David Gounaris <david.gounaris@...inera.com>
> Signed-off-by: Mathias Thore <mathias.thore@...inera.com>
> ---
>   drivers/net/ethernet/freescale/ucc_geth.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
> index c3d539e209ed..eb3e65e8868f 100644
> --- a/drivers/net/ethernet/freescale/ucc_geth.c
> +++ b/drivers/net/ethernet/freescale/ucc_geth.c
> @@ -1879,6 +1879,8 @@ static void ucc_geth_free_tx(struct ucc_geth_private *ugeth)
>   	u16 i, j;
>   	u8 __iomem *bd;
>   
> +	netdev_reset_queue(ugeth->ndev);
> +
>   	ug_info = ugeth->ug_info;
>   	uf_info = &ug_info->uf_info;
>   
>