Re: aoe fails on sparc64

["David S. Miller" <davem@davemloft.net>]

From: Ed L Cashin <ecashin@coraid.com>
Date: Wed, 31 Aug 2005 11:50:55 -0400

> Jim MacBaine <jmacbaine@gmail.com> writes:
> 
> > Aug 31 15:18:49 sunny kernel: devfs_mk_dir: invalid argument.<6>
> > etherd/e0.0: unknown partition table
> > Aug 31 15:18:49 sunny kernel: aoe: 0011d8xxxxxx e0.0 v4000 has
> > 67553994410557440
> > sectors
> 
> OK.  67553994410557440 is 61440 byte swapped in 64 bits, and 30MB is
> 61440 sectors, so this should be a simple byte order fix.

More strangely, the upper and lower 32-bit words are swapped.
The bytes within each 32-bit word are swapped correctly.

So the calculation maybe should be something like:

	__le32 *p = (__le32 *) &id[100 << 1];
	u32 high32 = le32_to_cpup(p);
	u32 low32 = le32_to_cpup(p + 1);

	ssize = (((u64)high32 << 32) | (u64) low32);

But that doesn't make any sense, and even ide_fix_driveid() in
drivers/ide/ide-iops.c does a le64_to_cpu() for this value:

	id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);

I wonder if this is some artifact of how AOE devices encode
this field when sending it to the client.