linux-kernel - Re: [PATCH net-next v23 04/13] rtase: Implement the interrupt routine and rtase

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Message-ID: <20240711183640.02241a9a@kernel.org>
Date: Thu, 11 Jul 2024 18:36:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Justin Lai <justinlai0215@...ltek.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <andrew@...n.ch>,
 <jiri@...nulli.us>, <horms@...nel.org>, <rkannoth@...vell.com>,
 <jdamato@...tly.com>, <pkshih@...ltek.com>, <larry.chiu@...ltek.com>
Subject: Re: [PATCH net-next v23 04/13] rtase: Implement the interrupt
 routine and rtase_poll

On Wed, 10 Jul 2024 11:32:25 +0800 Justin Lai wrote:
> +#ifdef CONFIG_NET_POLL_CONTROLLER
> +/* Polling 'interrupt' - used by things like netconsole to send skbs
> + * without having to re-enable interrupts. It's not called while
> + * the interrupt routine is executing.
> + */
> +static void rtase_netpoll(struct net_device *dev)
> +{
> +	const struct rtase_private *tp = netdev_priv(dev);
> +	const struct pci_dev *pdev = tp->pdev;
> +
> +	disable_irq(pdev->irq);
> +	rtase_interrupt(pdev->irq, dev);

Why do you need to implement a separate netpoll handler?
netpoll is optional, if driver doesn't implement it core
will just core your NAPI handlers with a budget of 0 (to
only clean up Tx, see NAPI documentation).

disable_irq() sleeps, you most definitely can't call it here.
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