linux-kernel - Re: [PATCH net-next v20 07/13] rtase: Implement a function to receive packets

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Message-ID: <20240617080232.620a2452@kernel.org>
Date: Mon, 17 Jun 2024 08:02:32 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Justin Lai <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>, "jiri@...nulli.us" <jiri@...nulli.us>, "horms@...nel.org"
 <horms@...nel.org>, "rkannoth@...vell.com" <rkannoth@...vell.com>, "Ping-Ke
 Shih" <pkshih@...ltek.com>, Larry Chiu <larry.chiu@...ltek.com>
Subject: Re: [PATCH net-next v20 07/13] rtase: Implement a function to
 receive packets

On Mon, 17 Jun 2024 06:44:55 +0000 Justin Lai wrote:
> > > +             /* make sure discriptor has been updated */
> > > +             rmb();  
> > 
> > Barriers are between things. What is this barrier between?  
> 
> At the end of this do while loop, it fetches the next descriptor. This
> barrier is mainly used between fetching the next descriptor and using
> the next descriptor, to ensure that the content of the next descriptor is
> completely fetched before using it.

What does it mean to "fetch the next descriptor"? The prefetch?
Prefetches are not ordered at all.