DPDK patches and discussions
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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, 30 Sep 2015 10:28:53 +0200
Message-ID: <CALwxeUuiFpPKeSOh11ANmJwbkTi3fSO6AVAi-TLWBNs0nTP66g@mail.gmail.com> (raw)
In-Reply-To: <20150929122542.419781cc@urahara>

On Tue, Sep 29, 2015 at 9:25 PM, Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Tue, 10 Mar 2015 09:14:28 -0400
> Neil Horman <nhorman@tuxdriver.com> wrote:
>
> >
> > I don't see how this works for all cases.  The constructor is called
> once when
> > the library is first loaded.  What if you have multiple independent
> (i.e. not
> > forked children) processes that are using the dpdk in parallel?  Only the
> > process that triggered the library load will have io permissions set
> > appropriately.  I think what you need is to have every application that
> expects
> > to call through the transmit path or poll the receive path call iopl,
> which I
> > think speaks to having this requirement documented, so each application
> can call
> > iopl prior to calling fork/daemonize/etc.
> >
>
> I am still seeing this problem with DPDK 2.0 and 2.1.
> It seems to me that doing the iopl init in eal_init is the only safe way.
> Other workaround is to have application calling iopl_init before eal_init
> but that kind of violates the current method of all things being
> initialized
> by eal_init
>

Putting it in the virtio pmd constructor is my preferred solution and we
don't need to pollute the eal for virtio (specific to x86, btw).


-- 
David Marchand

  reply	other threads:[~2015-09-30  8:28 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 [this message]
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
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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