From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH DOCDAY] netif.h: describe request/response
 structures in terms of binary layout
Date: Wed, 25 Feb 2015 12:34:45 +0000
Message-ID: <1424867685.20243.87.camel@citrix.com>
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Cc: keir@xen.org, tim@xen.org, ian.jackson@eu.citrix.com, jbeulich@suse.com, Wei Liu <wei.liu2@citrix.com>, Roger Pau =?ISO-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
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On Wed, 2015-02-25 at 12:16 +0000, Ian Campbell wrote:
> In RFC style, rather than relying on the implicit assumptions of a
> particular C ABI.
> 
> I have also confirmed, using the Python gdb extension technique in
> [0], that the struct offsets (in a Linux binary at least) are the same
> as described here.
[...]
> [] http://stackoverflow.com/questions/9788679/how-to-get-the-relative-adress-of-a-field-in-a-structure-dump-c,

I had intended after the cut to include for reference:

struct xen_netif_tx_request {
    gref => 0
    offset => 4
    flags => 6
    id => 8
    size => 10
}
struct xen_netif_extra_info {
    type => 0
    flags => 1
    u => 2
}
struct xen_netif_tx_response {
    id => 0
    status => 2
}
struct xen_netif_rx_request {
    id => 0
    gref => 4
}
struct xen_netif_rx_response {
    id => 0
    offset => 2
    flags => 4
    status => 6
}

(same for all arches, of course)

Ian.