linux-kernel - Re: [PATCH net-next] net: hns: optimize XGE capability by reducing cpu usage

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Date:	Mon, 07 Dec 2015 01:05:09 -0800
From:	Joe Perches <joe@...ches.com>
To:	"Yankejian (Hackim Yim)" <yankejian@...wei.com>,
	David Miller <davem@...emloft.net>
Cc:	lisheng011@...wei.com, lipeng321@...wei.com,
	salil.mehta@...wei.com, huangdaode@...ilicon.com,
	xuwei5@...ilicon.com, liguozhu@...wei.com, haifeng.wei@...wei.com,
	yisen.zhuang@...wei.com, linuxarm@...wei.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: hns: optimize XGE capability by reducing
 cpu usage

On Mon, 2015-12-07 at 16:58 +0800, Yankejian (Hackim Yim) wrote:
> On 2015/12/7 11:32, Joe Perches wrote:
> > On Sun, 2015-12-06 at 22:29 -0500, David Miller wrote:
> > > > From: yankejian <yankejian@...wei.com>
> > > > Date: Sat, 5 Dec 2015 15:32:29 +0800
> > > > 
> > > > > > +#if (PAGE_SIZE < 8192)
> > > > > > +     if (hnae_buf_size(ring) == HNS_BUFFER_SIZE_2048) {
> > > > > > +             truesize = hnae_buf_size(ring);
> > > > > > +     } else {
> > > > > > +             truesize = ALIGN(size, L1_CACHE_BYTES);
> > > > > > +             last_offset = hnae_page_size(ring) - hnae_buf_size(ring);
> > > > > > +     }
> > > > > > +
> > > > > > +#else
> > > > > > +             truesize = ALIGN(size, L1_CACHE_BYTES);
> > > > > > +             last_offset = hnae_page_size(ring) - hnae_buf_size(ring);
> > > > > > +#endif
> > > > 
> > > > This is not indented properly, and it looks terrible.
> > And it makes one curious as to why last_offset isn't set
> > in the first block.
> 
> Hi Joe,

Hello.

> if hnae_buf_size que equal to HNS_BUFFER_SIZE, last_offset is useless in the routines of this function.
> so it is ignored in the first block. thanks for your suggestion.

More to the point, last_offset is initialized to 0.

It'd be clearer not to initialize it at all and
set it to 0 in the first block and not overwrite
the initialization in each subsequent block.

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