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

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Message-ID: <20240612174311.7bd028e1@kernel.org>
Date: Wed, 12 Jun 2024 17:43:11 -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>,
 <pkshih@...ltek.com>, <larry.chiu@...ltek.com>
Subject: Re: [PATCH net-next v20 07/13] rtase: Implement a function to
 receive packets

On Fri, 7 Jun 2024 16:43:15 +0800 Justin Lai wrote:
> +static int rx_handler(struct rtase_ring *ring, int budget)
> +{
> +	const struct rtase_private *tp = ring->ivec->tp;
> +	union rtase_rx_desc *desc_base = ring->desc;
> +	u32 pkt_size, cur_rx, delta, entry, status;
> +	struct net_device *dev = tp->dev;
> +	union rtase_rx_desc *desc;
> +	struct sk_buff *skb;
> +	int workdone = 0;
> +
> +	cur_rx = ring->cur_idx;
> +	entry = cur_rx % RTASE_NUM_DESC;
> +	desc = &desc_base[entry];
> +
> +	do {
> +		/* make sure discriptor has been updated */
> +		rmb();

Barriers are between things. What is this barrier between?

> +		status = le32_to_cpu(desc->desc_status.opts1);
> +
> +		if (status & RTASE_DESC_OWN)
> +			break;