netdev - RE: [net-next PATCH 4/5] be2net: get rid of AMAP

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Message-ID: <CF9D1877D81D214CB0CA0669EFAE020C65638C@CMEXMB1.ad.emulex.com>
Date:	Fri, 28 Sep 2012 07:05:27 +0000
From:	"Perla, Sathya" <Sathya.Perla@...lex.Com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [net-next PATCH 4/5] be2net: get rid of AMAP_SET/GET macros in
 TX path

>-----Original Message-----
>From: David Miller [mailto:davem@...emloft.net]
>
>> endianness is handled even in this patch. The call to wrb_fill_hdr()
>> is followed by be_dws_cpu_to_le() to handle this.
>
>That swap_dws() thing is the most inefficient thing I've ever seen.
>
>Instead of being able to benefit from compile time optimizations
>such as byte swaps of constants, you do everything hidden from the
>compiler so nothing gets optimized.

I'd like to clarify that swap_dws() was being used/needed even in the old code. 
The AMAP_SET_BITS() macros (that this patch removes) did nothing to take care of endian byte-swapping.
They are just calculating the mask/shift values of each bit-field and setting the value
in host-endian.

But, as you are convinced that this patch doesn't provide much value, I'll just drop it and 
re-send the patch set....
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