[PATCH] mlx4_en: fix transmit of packages when blue frame is enabled

[David Laight]

> What is this __iowrite64_copy... oh I see
> 
> Nice, somebody _AGAIN_ added a bunch of "generic" IO 
> accessors that are utterly wrong on all archs except
> x86 (ok, -almost-).
> There isn't a single bloody memory barrier in there !

Actually memory barriers shouldn't really be added to
any of these 'accessor' functions.
(Or, at least, ones without barriers should be provided.)

The driver may want to to a series of writes, then a
single barrier, before a final write of a command (etc).

in_le32() from io.h is specially horrid!

	David