linux-kernel - RE: [PATCH net-next v14 03/13] rtase: Implement the rtase

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Message-ID: <39c9b2df2a02412b84f6e7946f012917@realtek.com>
Date:   Thu, 14 Dec 2023 12:54:11 +0000
From:   JustinLai0215 <justinlai0215@...ltek.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Larry Chiu <larry.chiu@...ltek.com>
Subject: RE: [PATCH net-next v14 03/13] rtase: Implement the rtase_down function

> 
> On Fri, 8 Dec 2023 17:47:23 +0800 Justin Lai wrote:
> > +     netif_stop_queue(dev);
> 
> You most likely want to stop the napi before you call this.
> Otherwise NAPI can do some clean up and restart the queue.
> 
> > +     /* give a racing hard_start_xmit a few cycles to complete */
> > +     synchronize_rcu();
> 
> Call netif_tx_disable() instead of stop_queue(), it takes the tx lock so you don't
> have to worry about in-flight packets.

Thanks for your suggestion, I will modify it.
> 
> > +     netif_carrier_off(dev);
> > +
> > +     for (i = 0; i < tp->int_nums; i++) {
> > +             ivec = &tp->int_vector[i];
> > +             synchronize_irq(ivec->irq);
> 
> Why?

This is redundant code, I will remove it.
> 
> > +             /* wait for any pending NAPI task to complete */
> > +             napi_disable(&ivec->napi);
> > +     }