linux-kernel - Re: [PATCH] net: ftgmac100: Enable TX interrupt to avoid TX timeout

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Message-ID: <80f1cd36-c806-4e09-9eac-a70891f50323@lunn.ch>
Date: Thu, 5 Sep 2024 22:50:54 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jacky Chou <jacky_chou@...eedtech.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ftgmac100: Enable TX interrupt to avoid TX timeout

On Wed, Sep 04, 2024 at 06:31:16PM +0800, Jacky Chou wrote:
> Currently, the driver only enables RX interrupt to handle RX
> packets and TX resources. Sometimes there is not RX traffic,
> so the TX resource needs to wait for RX interrupt to free.
> This situation will toggle the TX timeout watchdog when the MAC
> TX ring has no more resources to transmit packets.
> Therefore, enable TX interrupt to release TX resources at any time.

This looks reasonable. FTGMAC100_INT_ALL is used when NAPI polling is
not being used, so the extra interrupts should not cause additional
load.

Is this a fix? How easy is it to trigger the issue?

   Andrew