linux-kernel - RE: [PATCH net-next v27 07/13] rtase: Implement a function to receive packets

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Message-ID: <14b068505fda436e92b58b2ea86e45a6@realtek.com>
Date: Wed, 21 Aug 2024 09:02:41 +0000
From: Larry Chiu <larry.chiu@...ltek.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: Justin Lai <justinlai0215@...ltek.com>,
        "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>,
        "jdamato@...tly.com"
	<jdamato@...tly.com>,
        Ping-Ke Shih <pkshih@...ltek.com>
Subject: RE: [PATCH net-next v27 07/13] rtase: Implement a function to receive packets


> > > And you should have a periodic service task / work which checks for
> > > buffers being exhausted, and if they are schedule NAPI so that it tries
> > > to allocate.
> >
> > We will redefine the rtase_rx_ring_fill() to check the buffers and
> > try to get page from the pool.
> > Should we return the budget to schedule this NAPI if there are some
> > empty buffers?
> 
> I wouldn't recommend that. If system is under memory stress
> we shouldn't be adding extra load by rescheduling NAPI.

Okay, I get it, but there's a problem.
If all buffers are empty, it indicates that the memory allocation failed
multiple times. Should we keep trying to allocate or just log an error 
message and stop it?