netdev - Re: [PATCH net-next v3] bnxt_en: New Broadcom ethernet driver.

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Message-ID: <20151018222150.427d5311@xeon-e3>
Date:	Sun, 18 Oct 2015 22:21:50 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Michael Chan <mchan@...adcom.com>
Cc:	<davem@...emloft.net>, <prashant@...adcom.com>,
	<eddie.wai@...adcom.com>, <huangjw@...adcom.com>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v3] bnxt_en: New Broadcom ethernet driver.

On Sat, 17 Oct 2015 00:21:44 -0400
Michael Chan <mchan@...adcom.com> wrote:

> +static inline u32 bnxt_tx_avail(struct bnxt *bp, struct bnxt_tx_ring_info *txr)
> +{
> +	/* Tell compiler to fetch tx indices from memory. */
> +	barrier();

Actually, you are telling compiler not to reorder. Which may not
be sufficient on some platforms. 


> +	return bp->tx_ring_size -
> +		((txr->tx_prod - txr->tx_cons) & bp->tx_ring_mask);
> +}
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