Date: Sat, 19 Oct 2013 20:02:51 +0330 From: h bagade <bagadeh@gmail.com> To: Raimundo Santos <raitech@gmail.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Netmap and in-kernel IPFW interactions! Message-ID: <CAARSjE0DN=OsH6m8ufujA5A-8Kuh34bHQD%2BsVVu-SJ0skz2YiQ@mail.gmail.com> In-Reply-To: <CAGQ6iC_WAxuB%2BHgy4H1r6cgN0kxFRf=Zb%2BT5UAZTKnnKD%2BxVqA@mail.gmail.com> References: <CAARSjE3xe6uzYDA_scB8LT8jozUZ0%2B_SM5v1VwGt9RhxG_NEKQ@mail.gmail.com> <CAGQ6iC_WAxuB%2BHgy4H1r6cgN0kxFRf=Zb%2BT5UAZTKnnKD%2BxVqA@mail.gmail.com>
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On Sat, Oct 19, 2013 at 6:58 PM, Raimundo Santos <raitech@gmail.com> wrote:
> On 19 October 2013 06:00, h bagade <bagadeh@gmail.com> wrote:
>
> > Hi Everybody,
> >
> >
> Hello!
>
>
> > I have compiled my kernel with support of netmap without any changes on
> > ipfw. Afterwards, I defined ipfw rules and surprisingly they worked!!
> >
> >
> Being netmap-ed your kernel doesn't mean you are really using it. If your
> data continue to take normal paths, ie, do not touch netmap, it will be
> there to the in kernel classifier take care.
>
>
> > Before my experiment on ipfw, I'd thought because packets are reached to
> > userspace directly by means of netmap, so in-kernel ipfw won't be able to
> > check them in between?!
> >
> >
> You must open the netmap device and interact with it, no more, no less. As
> the OPERATION section of netmap(4) states:
>
> netmap clients must first open the open("/dev/netmap")
>
> If your NIC driver doesn't support netmap, you end up with the normal path
> to frames and packets.
>
>
> > Could anyone clarify me how in-kernel tools are able to work even after
> > netmap is used?
> >
>
> So, to clarify you, you must clarify us: how are you *using* it, actually?
>
> Best Regards,
> Raimundo Santos
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I've changed em and igb drivers too. In this situation, I think that they
are using netmap and grow-up performance is a sign of the change. I've
used pkt-gen for performance checking.
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