[dpdk-dev] [PATCH V3] ethdev: fix eth device released repeatedly

[Ferruh Yigit]

On 10/15/2021 4:44 AM, Huisong Li wrote:
> In secondary process, rte_eth_dev_close() doesn't clear eth_dev->data.
> If calling rte_dev_remove() after rte_eth_dev_close(),
> in rte_eth_dev_pci_generic_remove() function, the released eth device still
> can be found by its name in shared memory. As a result, the eth device will
> be released repeatedly. The state of the eth device is modified to
> RTE_ETH_DEV_UNUSED after rte_eth_dev_close(). So this state can be used to
> avoid this problem.
> 

Hi Huisong,

Can you please add Fixes line, and stable tag if the change is requested
for backport?


> Signed-off-by: Huisong Li <lihuisong at huawei.com>
> ---
> v2 -> v3:
>   * fix the commit log description and the comment inside the code.
> v1 -> v2:
>    * fix the commit log description.
> RFC -> v1:
>    * fix commit log and add a judgment for secondary process.
> ---
>   lib/ethdev/ethdev_pci.h | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/lib/ethdev/ethdev_pci.h b/lib/ethdev/ethdev_pci.h
> index 8edca82ce8..fcabae02fa 100644
> --- a/lib/ethdev/ethdev_pci.h
> +++ b/lib/ethdev/ethdev_pci.h
> @@ -151,6 +151,16 @@ rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
>   	if (!eth_dev)
>   		return 0;
>   
> +	/*
> +	 * In secondary process, a released eth device can be found by its name
> +	 * in shared memory.
> +	 * If the state of the eth device is RTE_ETH_DEV_UNUSED, it means the
> +	 * eth device has been released.
> +	 */
> +	if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
> +	    eth_dev->state == RTE_ETH_DEV_UNUSED)
> +		return 0;
> +
>   	if (dev_uninit) {
>   		ret = dev_uninit(eth_dev);
>   		if (ret)
>