netdev - Re: [RFC TRY#2][PATCH] bgmac: pass received packet to the netif instead of copying it

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Date:	Mon, 28 Oct 2013 16:28:58 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	zajec5@...il.com
Cc:	netdev@...r.kernel.org, openwrt-devel@...ts.openwrt.org
Subject: Re: [RFC TRY#2][PATCH] bgmac: pass received packet to the netif
 instead of copying it

From: Rafa┅ Mi┅ecki <zajec5@...il.com>
Date: Mon, 28 Oct 2013 18:42:22 +0100

> Copying whole packets with skb_copy_from_linear_data_offset is a pretty
> bad idea. CPU was spending time in __copy_user_common and network
> performance was lower. With the new solution iperf-measured speed
> increased from 116Mb/s to 134Mb/s.
> 
> Another way to improve performance could be switching to build_skb. It
> is cache-specific, so will require testing of various devices.
> 
> Signed-off-by: Rafa┅ Mi┅ecki <zajec5@...il.com>

Semantically this looks good but it needs some coding style fixes:

The following is indented correctly:

> +				dma_sync_single_for_device(dma_dev,
> +							   slot->dma_addr,
> +							   BGMAC_RX_BUF_SIZE,
> +							   DMA_FROM_DEVICE);
> +				break;
>  			}

However, this is not:

> +			/* Unmap old skb, we'll pass it to the netfif */
> +			dma_unmap_single(dma_dev, old_dma_addr,
> +						BGMAC_RX_BUF_SIZE,
> +						DMA_FROM_DEVICE);
> +

Like the first case, please align the arguments on the second and subsequently
line to start at the first column after the openning parenthesis on the
first line.

Every time I see this not done correctly, it's because the person doing it
is trying to use TAB characters only to indent.  You should be using the
appropriate number of TAB _and_ SPACE characters necessary to get things
lines up properly.
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