From: Stephen Hemminger <stephen@networkplumber.org>
To: Matan Azrad <matan@mellanox.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] ethdev: fix rte_eth_dev_owner_unset
Date: Tue, 14 Aug 2018 09:55:21 -0700 [thread overview]
Message-ID: <20180814095521.492e575a@xeon-e3> (raw)
In-Reply-To: <AM0PR0502MB4019D2C8D2486AEDF7B95734D2380@AM0PR0502MB4019.eurprd05.prod.outlook.com>
On Tue, 14 Aug 2018 05:52:20 +0000
Matan Azrad <matan@mellanox.com> wrote:
> Hi Stephen
>
> From: Stephen Hemminger
> > The rte_eth_dev_owner_unset function is unusable because it always
> > returns -EINVAL. This is because the magic (unowned) value is flagged as not
> > valid.
> >
>
> It's OK to raise an error when you do unset for unowned device.
> It means that unset owner should be called for owned device.
>
Original code was broken. The following would always fail.
rte_eth_dev_owner_new(&owner.id);
sprintf(owner.name, "example");
rte_eth_dev_owner_set(port_id, &owner);
rte_eth_dev_owner_unset(port_id, owner.id);
That is because of:
rte_eth_dev_owner_unset(port_id, owner_id)
_rte_eth_dev_owner_set(port_id, owner_id, &new_owner) << new_owner.id == RTE_ETH_DEV_NO_OWNER (0)
if (!rte_eth_is_valid_owner_id(new_owner->id) && << new_owner->id == RTE_ETH_DEV_NO_OWNER (which is flagged as invalid)
!rte_eth_is_valid_owner_id(old_owner_id))
return -EINVAL;
The failsafe driver never checks the return value, and therefore doesn't see that it never clears ownership.
next prev parent reply other threads:[~2018-08-14 16:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-14 0:19 Stephen Hemminger
2018-08-14 5:52 ` Matan Azrad
2018-08-14 16:55 ` Stephen Hemminger [this message]
2018-08-14 19:46 ` Matan Azrad
2018-08-24 13:55 ` Ferruh Yigit
2018-08-24 14:42 ` Stephen Hemminger
2018-08-16 22:44 ` [dpdk-dev] [PATCH 0/2] ethdev: minor ownership changes Stephen Hemminger
2018-08-16 22:44 ` [dpdk-dev] [PATCH 1/2] ethdev: silence error message on rte_eth_dev_owner_unset Stephen Hemminger
2018-08-21 10:04 ` Matan Azrad
2018-08-21 15:45 ` [dpdk-dev] [PATCH v3] " Stephen Hemminger
2018-08-21 15:53 ` Matan Azrad
2018-08-27 13:01 ` Ferruh Yigit
2018-08-16 22:44 ` [dpdk-dev] [PATCH 2/2] ethdev: make rte_eth_is_valid_owner_id return bool Stephen Hemminger
2018-08-21 10:20 ` Matan Azrad
2018-08-21 15:06 ` Stephen Hemminger
2018-08-21 15:48 ` Matan Azrad
2018-08-21 18:31 ` Stephen Hemminger
2018-08-26 7:49 ` Matan Azrad
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