netdev - Re: [PATCH net-next v14 06/13] rtase: Implement .ndo_start

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Date: Thu, 14 Dec 2023 09:24:11 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: JustinLai0215 <justinlai0215@...ltek.com>
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 06/13] rtase: Implement .ndo_start_xmit
 function

On Thu, 14 Dec 2023 13:00:29 +0000 JustinLai0215 wrote:
> > I don't see how this is called, the way you split the submission makes it a bit
> > hard to review, oh well. Anyway - if you pass the NAPI budget here - that's not
> > right, it may be 0, and you'd loop forever.
> > For Tx - you should try to reap some fixed number of packets, say 128, the
> > budget is for Rx, not for Tx.  
> 
> Even if the budget is 0, this function will not loop forever, it will just run all tx_left.
> Or what changes would you like us to make?

Ah, good point. It does seem a little accidental to me :S
In that case perhaps always consume all completed packets?
@budget should not constrain Tx completions directly, see:
https://www.kernel.org/doc/html/next/networking/napi.html