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From: "Singh, Aman Deep" <aman.deep.singh@intel.com>
To: Huisong Li <lihuisong@huawei.com>, <dev@dpdk.org>
Cc: <thomas@monjalon.net>, <ferruh.yigit@intel.com>
Subject: Re: [dpdk-dev] [RFC V1] ethdev: fix the issue that dev uninit may be called twice
Date: Wed, 18 Aug 2021 15:17:32 +0530
Message-ID: <44a1b455-31e8-7909-3011-1643293f3210@intel.com> (raw)
In-Reply-To: <1627908397-51565-1-git-send-email-lihuisong@huawei.com>

Hi Huison,

On 8/2/2021 6:16 PM, Huisong Li wrote:
> Ethernet devices in DPDK can be released by rte_eth_dev_close() and
> rte_dev_remove(). However, these two APIs do not have explicit invocation
> restrictions. In other words, at the ethdev layer, calling
> rte_eth_dev_close() and then rte_dev_remove() or rte_eal_hotplug_remove()
> is allowed. In such a bad scenario, the primary process may be fine, but it
> may cause that dev_unint() in the secondary process will be called twice,

Shouldn't dev_unint() for Secondary process, simply return with no-action.

> and even other serious problems. So this patch fixes it.
>
> Fixes: 99a2dd955fba ("lib: remove librte_ prefix from directory names")
>
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> ---
>   lib/ethdev/ethdev_pci.h | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
>
> diff --git a/lib/ethdev/ethdev_pci.h b/lib/ethdev/ethdev_pci.h
> index 8edca82..14a0e01 100644
> --- a/lib/ethdev/ethdev_pci.h
> +++ b/lib/ethdev/ethdev_pci.h
> @@ -151,6 +151,19 @@ rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
>   	if (!eth_dev)
>   		return 0;
>   
> +	/*
> +	 * The eth_dev->data->name doesn't be cleared by the secondary precess,
Can we reprase above sentence "doesn't be cleared "
> +	 * so above "eth_dev" isn't NULL after rte_eth_dev_close() called.
> +	 * Namely, whether "eth_dev" is NULL cannot be used to determine whether
> +	 * an ethdev port has been released.
> +	 * For both primary precess and secondary precess, eth_dev->state is
s/ precess / process
> +	 * RTE_ETH_DEV_UNUSED, which means the ethdev port has been released.
> +	 */
> +	if (eth_dev->state == RTE_ETH_DEV_UNUSED) {
> +		RTE_ETHDEV_LOG(INFO, "The ethdev port has been released.");
> +		return 0;
> +	}
> +
>   	if (dev_uninit) {
>   		ret = dev_uninit(eth_dev);
>   		if (ret)

  parent reply	other threads:[~2021-08-18  9:47 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 12:46 Huisong Li
2021-08-03  2:30 ` [dpdk-dev] [RFC V2] ethdev: fix issue that dev close in PMD calls twice Huisong Li
2021-08-13  2:11   ` Huisong Li
2021-08-13  6:12     ` Thomas Monjalon
2021-08-13  8:16       ` Huisong Li
2021-08-18 11:24         ` Ferruh Yigit
2021-08-19  3:45           ` Huisong Li
2021-08-24 14:42             ` Ferruh Yigit
2021-08-25  9:53               ` Huisong Li
2021-09-04  1:23                 ` Huisong Li
2021-09-18  3:31                 ` Huisong Li
2021-09-20 14:07                 ` Ferruh Yigit
2021-09-22  3:31                   ` Huisong Li
2021-09-28  7:19                     ` Singh, Aman Deep
2021-09-30 10:54                       ` Huisong Li
2021-09-30 11:01                         ` Ferruh Yigit
2021-10-08  6:13                           ` lihuisong (C)
2021-08-18  9:47 ` Singh, Aman Deep [this message]
2021-08-24  2:10   ` [dpdk-dev] [RFC V1] ethdev: fix the issue that dev uninit may be called twice Huisong Li
2021-10-08  8:21 ` [dpdk-dev] [PATCH] ethdev: fix eth device released repeatedly Huisong Li
2021-10-08 10:23   ` Thomas Monjalon
2021-10-09  1:29     ` lihuisong (C)
2021-10-12 11:39 ` [dpdk-dev] [PATCH V2] " Huisong Li
2021-10-12 15:33   ` Thomas Monjalon
2021-10-14  3:50     ` lihuisong (C)
2021-10-14 12:32     ` lihuisong (C)
2021-10-14 12:50       ` Thomas Monjalon
2021-10-15  3:03         ` lihuisong (C)
2021-10-15  3:44 ` [dpdk-dev] [PATCH V3] " Huisong Li
2021-10-19 13:09   ` Ferruh Yigit
2021-10-21  2:31     ` lihuisong (C)
2021-10-21  2:24 ` [dpdk-dev] [PATCH V4] " Huisong Li
2021-10-21 21:19   ` Ferruh Yigit

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