[Xen-ia64-devel] RE: Preliminary work on networking code

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

Another revision, this updated to be based on cset 8241
and a little more forward progress... still not intended
to run but raises an issue/question for Keir or Ewan:

The comms ring seems to require two consecutive pages,
one for xmit and one for rcv.  Both are obtained via
map_grant_ref.  However map_grant_ref on ia64 may
choose (like mmap) to return an address different than
the one requested.  If it does, I think the existing
netif code will break badly.  Are there two pages mapped
because PAGE_SIZE=4K on x86?  In other words, would one
16K page be sufficient for ia64?  Or do the two pages
potentially have different attributes and thus must really
be separate pages?

Thanks,
Dan

> -----Original Message-----
> From: Magenheimer, Dan (HP Labs Fort Collins) 
> Sent: Monday, November 21, 2005 5:57 PM
> To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Keir Fraser; 'Ewan Mellor'
> Subject: Preliminary work on networking code
> 
> I did a little work on netback and balloon to get them
> to compile for ia64.  (netfront compiles without changes)
> The attached patch on top of xen-unstable cset 7963 will
> compile.  A few notes:
> 
> 1) The resulting linux uses Xen-specific alloc_skb
>    and __dev_alloc_skb so this will NOT be transparently
>    paravirtualizable.  (It could be done with changes
>    to the x86 sparse files; I haven't done it.)
> 2) The resulting code isn't intended to work, just to
>    compile.  It should identify the vast majority of
>    arch-dep lines in the netback/balloon code, but
>    may entirely miss other code that will need semantic
>    changes to get networking working.
> 3) Because there are so many (25) "ifdef __ia64__"
>    it's unlikely this would be accepted into the
>    Xen tree.  More work needs to be done first.
> 4) It might be possible (using the now-unused ia64
>    patch file mechanism) to shoehorn this code into
>    the tree.
> 
> Dan
>

Attachment: compile-net-ia64.8241.patch
Description: compile-net-ia64.8241.patch

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