From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Thomas Monjalon <thomas@monjalon.net>,
dev@dpdk.org, Cristian Dumitrescu <cristian.dumitrescu@intel.com>,
Bruce Richardson <bruce.richardson@intel.com>,
Anatoly Burakov <anatoly.burakov@intel.com>
Subject: Re: [RFC] Remove Kernel Network Interface (KNI)
Date: Sat, 14 Jan 2023 14:21:35 -0800 [thread overview]
Message-ID: <20230114222135.GA1572@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> (raw)
In-Reply-To: <20230113152530.634e6d1e@hermes.local>
On Fri, Jan 13, 2023 at 03:25:30PM -0800, Stephen Hemminger wrote:
> On Fri, 13 Jan 2023 19:34:24 +0100
> Thomas Monjalon <thomas@monjalon.net> wrote:
>
> > 13/01/2023 18:13, Stephen Hemminger:
> > > On Fri, 13 Jan 2023 09:12:16 +0100
> > > Thomas Monjalon <thomas@monjalon.net> wrote:
> > >
> > > > 13/01/2023 06:03, Stephen Hemminger:
> > > > > The Linux special network driver for kernel networking has been
> > > > > a long term problem for DPDK. The performance benefits of KNI
> > > > > are available via virtio-user and XDP, and the simpler kernel
> > > > > interface via TAP is also available.
> > > > >
> > > > > This driver has required lots of effort to keep up with the
> > > > > kernel API changes. And the overall architecture of the driver
> > > > > is fundamentally insecure and has unfixable locking and data
> > > > > race problems. No developer has been willing to do extensive
> > > > > tests or be the maintainer.
> > > > >
> > > > > In short, the time has come to do some early spring cleaning
> > > > > and remove KNI from DPDK 23.03.
> > > >
> > > > In doc/guides/rel_notes/deprecation.rst it is announced
> > > > to be removed in 23.11. Let's keep this RFC for later :)
> > > >
> > > >
> > >
> > > For 23.03 could we add a deprecation log message when library is
> > > used and when kernel module is loaded.
> >
> > We already have a message in the lib:
> >
> > int
> > rte_kni_init(unsigned int max_kni_ifaces __rte_unused)
> > {
> > RTE_LOG(WARNING, KNI, "WARNING: KNI is deprecated and will be removed in DPDK 23.11\n");
> >
> > It is a good idea to add a message in the kernel module loading.
> >
> >
> >
> >
>
> No matter how much we tell users, guarantee someone will still miss it and complain :-)
one of the techniques we use is to remove the headers in advance of
removing the ABI. the warning becomes a lot more clear when you can't
compile anymore but your existing binaries continue to run.
prev parent reply other threads:[~2023-01-14 22:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-13 5:03 Stephen Hemminger
2023-01-13 8:12 ` Thomas Monjalon
2023-01-13 17:13 ` Stephen Hemminger
2023-01-13 18:34 ` Thomas Monjalon
2023-01-13 23:25 ` Stephen Hemminger
2023-01-14 22:21 ` Tyler Retzlaff [this message]
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