From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Matan Azrad <matan@mellanox.com>,
Thomas Monjalon <thomas@monjalon.net>,
Gaetan Rivet <gaetan.rivet@6wind.com>,
Jingjing Wu <jingjing.wu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
Neil Horman <nhorman@tuxdriver.com>,
Bruce Richardson <bruce.richardson@intel.com>,
Konstantin Ananyev <konstantin.ananyev@intel.com>,
"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [PATCH v3 1/7] ethdev: fix port data reset timing
Date: Tue, 27 Mar 2018 23:37:52 +0100 [thread overview]
Message-ID: <1aac7e4c-6f2a-7f3d-5f7c-e07e48baac6a@intel.com> (raw)
In-Reply-To: <AM4PR0501MB26574B4D8CF840957B7FBB40D2DA0@AM4PR0501MB2657.eurprd05.prod.outlook.com>
On 3/5/2018 3:12 PM, Matan Azrad wrote:
> Hi Ferruh
>
> From: Ferruh Yigit, Sent: Monday, March 5, 2018 5:07 PM
>> On 3/5/2018 2:52 PM, Matan Azrad wrote:
>>> HI
>>>
>>> From: Ferruh Yigit, Sent: Monday, March 5, 2018 1:24 PM
>>>> On 1/18/2018 4:35 PM, Matan Azrad wrote:
>>>>> rte_eth_dev_data structure is allocated per ethdev port and can be
>>>>> used to get a data of the port internally.
>>>>>
>>>>> rte_eth_dev_attach_secondary tries to find the port identifier using
>>>>> rte_eth_dev_data name field comparison and may get an identifier of
>>>>> invalid port in case of this port was released by the primary
>>>>> process because the port release API doesn't reset the port data.
>>>>>
>>>>> So, it will be better to reset the port data in release time instead
>>>>> of allocation time.
>>>>>
>>>>> Move the port data reset to the port release API.
>>>>>
>>>>> Fixes: d948f596fee2 ("ethdev: fix port data mismatched in multiple
>>>>> process model")
>>>>> Cc: stable@dpdk.org
>>>>>
>>>>> Signed-off-by: Matan Azrad <matan@mellanox.com>
>>>>> ---
>>>>> lib/librte_ether/rte_ethdev.c | 2 +-
>>>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/lib/librte_ether/rte_ethdev.c
>>>>> b/lib/librte_ether/rte_ethdev.c index 7044159..156231c 100644
>>>>> --- a/lib/librte_ether/rte_ethdev.c
>>>>> +++ b/lib/librte_ether/rte_ethdev.c
>>>>> @@ -204,7 +204,6 @@ struct rte_eth_dev *
>>>>> return NULL;
>>>>> }
>>>>>
>>>>> - memset(&rte_eth_dev_data[port_id], 0, sizeof(struct
>>>> rte_eth_dev_data));
>>>>> eth_dev = eth_dev_get(port_id);
>>>>> snprintf(eth_dev->data->name, sizeof(eth_dev->data->name),
>>>> "%s", name);
>>>>> eth_dev->data->port_id = port_id;
>>>>> @@ -252,6 +251,7 @@ struct rte_eth_dev *
>>>>> if (eth_dev == NULL)
>>>>> return -EINVAL;
>>>>>
>>>>> + memset(eth_dev->data, 0, sizeof(struct rte_eth_dev_data));
>>>>
>>>> Hi Matan,
>>>>
>>>> What most of the vdev release path does is:
>>>>
>>>> eth_dev = rte_eth_dev_allocated(...)
>>>> rte_free(eth_dev->data->dev_private);
>>>> rte_free(eth_dev->data);
>>>> rte_eth_dev_release_port(eth_dev);
>>>>
>>>> Since eth_dev->data freed, memset() it in rte_eth_dev_release_port()
>>>> will be problem.
>>>>
>>>> We don't run remove path that is why we didn't hit the issue but this
>>>> seems problem for all virtual PMDs.
>>>
>>> Yes, it is a problem and should be fixed:
>>> For vdevs which use private rte_eth_dev_data the remove order can be:
>>> private_data = eth_dev->data;
>>> rte_free(eth_dev->data->dev_private);
>>> rte_eth_dev_release_port(eth_dev); /* The last operation working
>> on ethdev structure. */
>>> rte_free(private_data);
>>
>> Do we need to save "private_data"?
>
> Just to emphasis that eth_dev structure should not more be available after rte_eth_dev_release_port().
> Maybe in the future rte_eth_dev_release_port() will zero eth_dev structure too :)
Hi Matan,
Reminder of this issue, it would be nice to fix in this release.
>
>>>
>>>
>>>> Also rte_eth_dev_pci_release() looks problematic now.
>>>
>>> Yes, again, the last operation working on ethdev structure should be
>> rte_eth_dev_release_port().
>>>
>>> So need to fix all vdevs and the rte_eth_dev_pci_release() function.
>>>
>>> Any comments?
>>>
>
next prev parent reply other threads:[~2018-03-27 22:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1511870281-15282-1-git-send-email-matan@mellanox.com>
[not found] ` <1515318351-4756-1-git-send-email-matan@mellanox.com>
2018-01-07 9:45 ` [dpdk-stable] [PATCH v2 1/6] " Matan Azrad
[not found] ` <1516293317-30748-1-git-send-email-matan@mellanox.com>
2018-01-18 16:35 ` [dpdk-stable] [PATCH v3 1/7] " Matan Azrad
2018-01-18 17:00 ` Thomas Monjalon
2018-01-19 12:38 ` Ananyev, Konstantin
2018-03-05 11:24 ` Ferruh Yigit
2018-03-05 14:52 ` Matan Azrad
2018-03-05 15:06 ` Ferruh Yigit
2018-03-05 15:12 ` Matan Azrad
2018-03-27 22:37 ` Ferruh Yigit [this message]
2018-03-28 12:07 ` Matan Azrad
2018-03-30 10:39 ` Ferruh Yigit
2018-04-19 11:07 ` Ferruh Yigit
2018-04-25 12:16 ` Matan Azrad
2018-04-25 12:30 ` [dpdk-stable] [dpdk-dev] " Ori Kam
2018-04-25 12:54 ` [dpdk-stable] " Ferruh Yigit
2018-04-25 14:01 ` Matan Azrad
2018-01-18 16:35 ` [dpdk-stable] [PATCH v3 2/7] ethdev: fix used portid allocation Matan Azrad
2018-01-18 17:00 ` Thomas Monjalon
2018-01-19 12:40 ` Ananyev, Konstantin
2018-01-20 16:48 ` Matan Azrad
2018-01-20 17:26 ` Ananyev, Konstantin
[not found] ` <1516483468-9048-1-git-send-email-matan@mellanox.com>
2018-01-20 21:24 ` [dpdk-stable] [PATCH v4 1/7] ethdev: fix port data reset timing Matan Azrad
2018-01-20 21:24 ` [dpdk-stable] [PATCH v4 2/7] ethdev: fix used portid allocation Matan Azrad
[not found] ` <1516639103-27166-1-git-send-email-matan@mellanox.com>
2018-01-22 16:38 ` [dpdk-stable] [PATCH v5 1/7] ethdev: fix port data reset timing Matan Azrad
2018-01-22 16:38 ` [dpdk-stable] [PATCH v5 2/7] ethdev: fix used portid allocation Matan Azrad
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