netdev - Re: [net-next v18 2/7] net: mtip: The L2 switch driver for imx287

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Message-ID: <20250815182930.196973bb@kernel.org>
Date: Fri, 15 Aug 2025 18:29:30 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Lukasz Majewski <lukasz.majewski@...lbox.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, davem@...emloft.net, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
 <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Richard Cochran
 <richardcochran@...il.com>, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, Stefan Wahren
 <wahrenst@....net>, Simon Horman <horms@...nel.org>, Andrew Lunn
 <andrew@...n.ch>
Subject: Re: [net-next v18 2/7] net: mtip: The L2 switch driver for imx287

On Wed, 13 Aug 2025 09:07:50 +0200 Lukasz Majewski wrote:
> +	pkts = mtip_switch_rx(napi->dev, budget, &port);
> +	if (pkts == -ENOMEM) {
> +		napi_complete(napi);
> +		return 0;

And what happens next? looks like you're not unmasking the interrupt in
this case so we'll never get an IRQ until timeout kicks in?

> +	}
> +
> +	if ((port == 1 || port == 2) && fep->ndev[port - 1])
> +		mtip_switch_tx(fep->ndev[port - 1]);
> +	else
> +		mtip_switch_tx(napi->dev);
> +
> +	if (pkts < budget) {
> +		napi_complete_done(napi, pkts);

Please take napi_complete_done()'s return value into account

> +		/* Set default interrupt mask for L2 switch */
> +		writel(MCF_ESW_IMR_RXF | MCF_ESW_IMR_TXF,
> +		       fep->hwp + ESW_IMR);
> +	}