[dpdk-dev] [dpdk-stable] [PATCH v3 1/7] ethdev: fix port data reset timing

[Ferruh Yigit]

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 at dpdk.org
> 
> Signed-off-by: Matan Azrad <matan at 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.
Also rte_eth_dev_pci_release() looks problematic now.

Can you please check the issue?