David S. Miller writes:
> The networking never has, and probably never will, guarentee the
> alignment of packets. This means that all of your checksum support
> needs to handle completely arbitrary alignment cases.
It's not the checksum code which is broken.
> The networking also requires that unaligned load/store will work
> in the kernel. If you don't handle this, then IPX, Appletalk, and
> some of the other more esoteric protocols will simply not work
> on your platform.
I am aware that the other protocols will not work, however, since I'm
using only IP, it "should" work.
> So does the ARM code handle this?
The processor does not handle unaligned accesses by itself - you have
to take an unaligned trap handler just like the ALPHA has to. This
means that performance is hit badly.
Since I don't have a requirement for the trap handler, I have it
disabled, especially as outgoing IP packets over ethernet definitely
should always be aligned.
And thanks to Alexy for confirming the problem.
_____
|_____| ------------------------------------------------- ---+---+-
| | Russell King rmk@arm.linux.org.uk --- ---
| | | | http://www.arm.linux.org.uk/~rmk/aboutme.html / / |
| +-+-+ --- -+-
/ | THE developer of ARM Linux |+| /|\
/ | | | --- |
+-+-+ ------------------------------------------------- /\\\ |
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