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

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Message-ID: <20240729191559.1683ec63@kernel.org>
Date: Mon, 29 Jul 2024 19:15:59 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Justin Lai <justinlai0215@...ltek.com>
Cc: <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <andrew@...n.ch>,
 <jiri@...nulli.us>, <horms@...nel.org>, <rkannoth@...vell.com>,
 <jdamato@...tly.com>, <pkshih@...ltek.com>, <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.