netdev - RE: [net-next 2/7] bna: Tx and Rx Optimizations

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Date:	Fri, 7 Dec 2012 10:46:22 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Rasesh Mody" <rmody@...cade.com>, <davem@...emloft.net>,
	<netdev@...r.kernel.org>
Cc:	<bhutchings@...arflare.com>,
	<adapter_linux_open_src_team@...cade.com>
Subject: RE: [net-next 2/7] bna: Tx and Rx Optimizations

>  #define BNA_QE_INDX_ADD(_qe_idx, _qe_num, _q_depth)			\
>  	((_qe_idx) = ((_qe_idx) + (_qe_num)) & ((_q_depth) - 1))
> 
> +#define BNA_QE_INDX_INC(_idx, _q_depth)					\
> +do {									\
> +	(_idx)++;							\
> +	if ((_idx) == (_q_depth))					\
> +		(_idx) = 0;						\
> +} while (0)
> +

If q_depth has to be a power of 2 (implied by BNA_QE_IND_ADD())
then you should mask in BNA_QE_INDX_INC() to save the conditional.
Or just:
#define BNA_QE_INDX_INC(_idx, _q_depth) BNA_QE_INDX_ADD(_idx, 1, _q_depth)

	David



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