linux-kernel - Re: [PATCH 1/4] net: wan: Add support for QMC HDLC

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Date: Wed, 24 Jan 2024 15:39:27 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Andrew Lunn <andrew@...n.ch>, Mark Brown
 <broonie@...nel.org>, Christophe Leroy <christophe.leroy@...roup.eu>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/4] net: wan: Add support for QMC HDLC

Hi Vadim,

On Wed, 24 Jan 2024 10:03:45 +0000
Vadim Fedorenko <vadim.fedorenko@...ux.dev> wrote:

[...]

> > +static void qmc_hcld_recv_complete(void *context, size_t length, unsigned int flags)
> > +{
> > +	struct qmc_hdlc_desc *desc = context;
> > +	struct net_device *netdev = desc->netdev;
> > +	struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(desc->netdev);  
> 
> a line above desc->netdev was stored in netdev. better to reuse it and 
> make declaration part consistent with qmc_hcld_xmit_complete

Yes.
Will updated in the next iteration.

[...]

> > +static netdev_tx_t qmc_hdlc_xmit(struct sk_buff *skb, struct net_device *netdev)
> > +{
> > +	struct qmc_hdlc *qmc_hdlc = netdev_to_qmc_hdlc(netdev);
> > +	struct qmc_hdlc_desc *desc;
> > +	unsigned long flags;
> > +	int ret;
> > +
> > +	spin_lock_irqsave(&qmc_hdlc->tx_lock, flags);
> > +	desc = &qmc_hdlc->tx_descs[qmc_hdlc->tx_out];
> > +	if (desc->skb) {
> > +		/* Should never happen.
> > +		 * Previous xmit should have already stopped the queue.
> > +		 */  
> 
> according to the comment it's better to make if(unlikely(desc->skb)) or
> even WARN_ONCE()
> 

Indeed. I will use WARN_ONCE() in the next iteration.

Thanks for your review,
Hervé