From: David Marchand <david.marchand@6wind.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 2/2] virtio: change io privilege level as early as possible
Date: Wed, 14 Oct 2015 10:00:07 +0200 [thread overview]
Message-ID: <CALwxeUvfb2CWKW4AOHtinoOW+Y45=FRmCwAPgB+26moFa1Tonw@mail.gmail.com> (raw)
In-Reply-To: <20151013170706.376bbdd8@xeon-e3>
On Wed, Oct 14, 2015 at 2:07 AM, Stephen Hemminger <
stephen@networkplumber.org> wrote:
> On Thu, 1 Oct 2015 07:25:45 -0400
> Neil Horman <nhorman@tuxdriver.com> wrote:
>
> > On Wed, Sep 30, 2015 at 05:37:05PM +0200, Thomas Monjalon wrote:
> > > 2015-09-30 10:52, Neil Horman:
>
> > > I think it may be solved by calling iopl in the constructor.
> > > We just need an extra call in rte_virtio_pmd_init() to detect iopl
> failures.
> > > We can also simply move rte_eal_intr_init() after rte_eal_dev_init().
> > > Please read my previous post on this topic:
> > >
> http://thread.gmane.org/gmane.comp.networking.dpdk.devel/14761/focus=22341
> > >
> > > About the multiprocess case, I don't see the problem as the RX/TX and
> interrupt
> > > threads are forked in the rte_eal_init() context which should call
> iopl even in
> > > secondary processes.
> > >
> >
> > I'm not talking about secondary processes here (i.e. processes forked
> from a
> > parent that was the process which initialized the dpdk). I'm referring
> to two
> > completely independent processes, both of which link to and use the dpdk.
> >
> > Though I think we're saying the same thing. When you say 'constructor'
> above,
> > you don't mean 'constructor' in the strict sense, but rather the pmd init
> > routine (the one called from rte_eal_vdev_init and rte_eal_dev_init).
> If this
> > is the case, then yes, that works fine, since each process linking to
> the DPDK
> > will enter those routines and call iopl. In fact, if thats the case,
> then no
> > call is needed in the constructor at all.
>
> I think this patch should be rebased and resubmitted for 2.2.
>
> It fixes a real problem (virtio link state). The driver changed directory
> and the the patch could be redone to minimize changes.
>
I am testing Thomas proposal (just moving the intr_init() call), else I
will rebase this patch.
--
David Marchand
next prev parent reply other threads:[~2015-10-14 8:00 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-06 0:45 [dpdk-dev] [PATCH 0/2] virtio: bugfixes Stephen Hemminger
2015-03-06 0:45 ` [dpdk-dev] [PATCH 1/2] virtio: initialize iopl when device is initialized Stephen Hemminger
2015-03-06 3:41 ` Ouyang, Changchun
2015-03-06 16:20 ` Stephen Hemminger
2015-03-06 16:33 ` David Marchand
2015-03-06 16:55 ` Stephen Hemminger
2015-03-06 22:04 ` David Marchand
2015-03-06 23:43 ` Stephen Hemminger
2015-03-07 6:53 ` David Marchand
2015-03-09 11:05 ` David Marchand
2015-03-09 14:56 ` [dpdk-dev] [PATCH 0/2] fix virtio interrupt handling David Marchand
2015-03-09 14:56 ` [dpdk-dev] [PATCH 1/2] eal/linux: move plugin load to very start of eal init David Marchand
2015-03-09 15:21 ` Neil Horman
[not found] ` <CALwxeUs4hPbYDPBUfz9u2AoiCoj_wwTsAyj=_1xxzuT6LLW6nw@mail.gmail.com>
2015-03-10 10:55 ` Neil Horman
2015-10-14 0:05 ` Stephen Hemminger
2015-10-14 9:55 ` David Marchand
2015-03-09 14:56 ` [dpdk-dev] [PATCH 2/2] virtio: change io privilege level as early as possible David Marchand
2015-03-10 13:14 ` Neil Horman
2015-09-29 19:25 ` Stephen Hemminger
2015-09-30 8:28 ` David Marchand
2015-09-30 14:52 ` Neil Horman
2015-09-30 15:37 ` Thomas Monjalon
2015-09-30 17:26 ` Stephen Hemminger
2015-10-01 11:25 ` Neil Horman
2015-10-12 20:08 ` Stephen Hemminger
2015-10-14 0:07 ` Stephen Hemminger
2015-10-14 8:00 ` David Marchand [this message]
2015-10-14 9:49 ` David Marchand
2015-10-14 9:50 ` [dpdk-dev] [PATCH] eal: move interrupt init after device init David Marchand
2015-10-14 11:32 ` David Marchand
2015-10-20 21:22 ` Thomas Monjalon
2015-07-29 17:26 ` [dpdk-dev] [PATCH 1/2] virtio: initialize iopl when device is initialized Thomas Monjalon
2015-03-06 0:45 ` [dpdk-dev] [PATCH 2/2] virtio: allow running w/o vlan filtering Stephen Hemminger
2015-03-06 3:39 ` Ouyang, Changchun
2015-03-06 16:24 ` Stephen Hemminger
2015-07-29 12:56 ` Thomas Monjalon
2015-07-30 1:23 ` Ouyang, Changchun
2015-08-04 12:51 ` Vincent JARDIN
2015-08-05 1:01 ` Ouyang, Changchun
2015-08-05 1:22 ` Stephen Hemminger
2015-08-05 10:49 ` Vincent JARDIN
2015-10-21 13:58 ` Thomas Monjalon
2017-02-15 8:38 ` Thomas Monjalon
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