linux-kernel - RE: [PATCH net-next v25 02/13] rtase: Implement the .ndo

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Message-ID: <24521b998abd478f88116950488fda17@realtek.com>
Date: Tue, 30 Jul 2024 09:24:32 +0000
From: Justin Lai <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>,
        "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>, Larry Chiu <larry.chiu@...ltek.com>
Subject: RE: [PATCH net-next v25 02/13] rtase: Implement the .ndo_open function

> On Mon, 29 Jul 2024 14:21:10 +0800 Justin Lai wrote:
> > +     page = page_pool_dev_alloc_pages(tp->page_pool);
> > +     if (!page) {
> > +             netdev_err(tp->dev, "failed to alloc page\n");
> > +             goto err_out;
> > +     }
> > +
> > +     buf_addr = page_address(page);
> > +     mapping = page_pool_get_dma_addr(page);
> > +
> > +     skb = build_skb(buf_addr, PAGE_SIZE);
> 
> Don't build_skb() before packet was received.
> 
> One of the benefits of build_skb() is that the skb is supposed to be more likely
> to be still in CPU cache.

Ok, I will modify it.

Thanks
Justin