netdev - Re: [PATCH net-next 1/4] net: ethernet: am65-cpsw: call netif_carrier

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Message-ID: <20250115181318.2dd11693@fedora.home>
Date: Wed, 15 Jan 2025 18:13:18 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Roger Quadros <rogerq@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Russell King
 <linux@...linux.org.uk>, Alexei Starovoitov <ast@...nel.org>, Daniel
 Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>,
 John Fastabend <john.fastabend@...il.com>, Siddharth Vadapalli
 <s-vadapalli@...com>, srk@...com, danishanwar@...com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] net: ethernet: am65-cpsw: call
 netif_carrier_on/off() when appropriate

Hello Roger,

On Wed, 15 Jan 2025 18:43:00 +0200
Roger Quadros <rogerq@...nel.org> wrote:

> Call netif_carrier_on/off when link is up/down.
> When link is up only wake TX netif queue if network device is
> running.
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> index dcb6662b473d..36c29d3db329 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> @@ -2155,6 +2155,7 @@ static void am65_cpsw_nuss_mac_link_down(struct phylink_config *config, unsigned
>  	cpsw_sl_ctl_clr(port->slave.mac_sl, mac_control);
>  
>  	am65_cpsw_qos_link_down(ndev);
> +	netif_carrier_off(ndev);

You shouldn't need to do that, phylink does that for you :
https://elixir.bootlin.com/linux/v6.13-rc3/source/drivers/net/phy/phylink.c#L1434

Are you facing any specific problem that motivates that patch ?

>  	netif_tx_stop_all_queues(ndev);
>  }
>  
> @@ -2196,7 +2197,9 @@ static void am65_cpsw_nuss_mac_link_up(struct phylink_config *config, struct phy
>  	cpsw_ale_control_set(common->ale, port->port_id, ALE_PORT_STATE, ALE_PORT_STATE_FORWARD);
>  
>  	am65_cpsw_qos_link_up(ndev, speed);
> -	netif_tx_wake_all_queues(ndev);
> +	netif_carrier_on(ndev);

Same here, phylink will set the carrier on by itself.

Thanks,

Maxime