Re: [Xen-devel] [PATCH] libxl: do not assume Dom0 backend while getting nic info

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Sep 05, 2016 at 11:44:46AM +0200, Marek Marczykowski-Górecki wrote:
> On Mon, Sep 05, 2016 at 10:39:16AM +0100, Wei Liu wrote:
> > On Mon, Sep 05, 2016 at 11:26:04AM +0200, Marek Marczykowski-Górecki wrote:
> > > Fill backend_domid field based on backend path.
> > > 
> > > Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> > > Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> > > Signed-off-by: Marek Marczykowski-Górecki 
> > > <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> > 
> > Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> > 
> > I think this is a backport candidate?
> 
> Yes, certainly. If you want I can send a 4.7 version (function is in
> libxl.c there).
> 

That would be helpful. Please use PATCH for-4.7 tag and use the
technique I describe below to add postscript that you don't wish to be
in commit message.

> In general, should I somehow somehow request a backport in the patch
> itself? How?

State between the three dashes anything you wish to say --- the content
would be automatically stripped out when committing. I normally do like
this in commit message


libxl: fix foo

Foo is broken because of X, fix it by doing Y.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Please backport to version Z of Xen.


> 
> > > ---
> > >  tools/libxl/libxl_nic.c | 12 ++++++++++++
> > >  1 file changed, 12 insertions(+)
> > > 
> > > diff --git a/tools/libxl/libxl_nic.c b/tools/libxl/libxl_nic.c
> > > index c34b7ba..d1caa90 100644
> > > --- a/tools/libxl/libxl_nic.c
> > > +++ b/tools/libxl/libxl_nic.c
> > > @@ -309,6 +309,18 @@ static int libxl__device_nic_from_xenstore(libxl__gc 
> > > *gc,
> > >      else
> > >          nic->devid = 0;
> > >  
> > > +    rc = libxl__xs_read_checked(gc, XBT_NULL,
> > > +                                GCSPRINTF("%s/backend", libxl_path), 
> > > &tmp);
> > > +    if (rc) goto out;
> > > +
> > > +    if (!tmp) {
> > > +        LOG(ERROR, "nic %s does not exist (no backend path)", 
> > > libxl_path);
> > > +        rc = ERROR_FAIL;
> > > +        goto out;
> > > +    }
> > > +    rc = libxl__backendpath_parse_domid(gc, tmp, &nic->backend_domid);
> > > +    if (rc) goto out;
> > > +
> > >      /* nic->mtu = */
> > >  
> > >      rc = libxl__xs_read_checked(gc, XBT_NULL,
> > > -- 
> > > 2.5.5
> > > 
> 
> -- 
> Best Regards,
> Marek Marczykowski-Górecki
> Invisible Things Lab
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?



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