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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 6 Dec 2005, at 16:09, Magenheimer, Dan (HP Labs Fort Collins) wrote:

> I'm confused: netback/interface.c:map/unmap_frontend_pages()
> and netif_map all use consecutive pages and netif->comms_area
> is set to point to the first of the two pages.  Then (also
> in netif_map) the xmit sring is set to point to the first
> page and the rcv sring is set to point to the second (of
> the two consecutive) page.
>
> Or are you saying that all of the code in netback/interface.c
> could/should be rewritten to not make this assumption? (including
> the calls to free_vm_area(netif->comms_area) which are
> freeing both pages?)
They are arbitrary memory pages that happen to be mapped consecutively 
in the kernel virtual address space by netback. They get allocated 
independently in the netfront driver (function setup_device()) and 
separate grant references are generated for them.
 -- Keir


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