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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 1/2] virtio: initialize iopl when device is initialized
Date: Sat, 7 Mar 2015 07:53:40 +0100
Message-ID: <CALwxeUuK=8ZRHgqAS=wyv-pG3=_F0qd1rB7mhjjAmmWDkW3ZnQ@mail.gmail.com> (raw)
In-Reply-To: <20150306154344.7057b6d4@urahara>

On Sat, Mar 7, 2015 at 12:43 AM, Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Fri, 6 Mar 2015 23:04:33 +0100
> David Marchand <david.marchand@6wind.com> wrote:
>
> > In the end, the fix would be to move rte_eal_intr_init() after
> rte_eal_dev_init().
>
>
> That would work, but was worried it would break other devices.
>

I had checked the pmds before proposing.

rte_intr_* api is called only from the pdev (meaning pci) drivers at the
moment.

rte_eal_dev_init() means we are still in the "pmd init" phase for the pdev
drivers which means we are still initialising per-driver things for them
since they have no idea of the devices to handle (the devices are
discovered later with the pci scan).
In this phase, the code tells that they are not registering interrupts (and
I don't see how they could register interrupts without knowing devices).

The only problem would be for future vdev drivers (current drivers do not
use rte_intr_*).
But this problem would occur because the driver/device datamodel is not
consistent.
If we could rework this to have devices instantiated at the same phase,
then the problem won't happen.
So, we can hope we will have reworked the driver/device datamodel in dpdk,
before this problem hits us.


I only had checked the pmds, so I may have missed something else that uses
interrupts (if any) but I think this is worth trying and fixing for 2.0.
Thomas, opinion ?


-- 
David Marchand

  reply	other threads:[~2015-03-07  6:53 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 [this message]
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
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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