[dpdk-dev] [PATCH 20/22] net/tap: enable port detach on secondary process

[Wiles, Keith]

> On Jun 7, 2018, at 5:38 AM, Qi Zhang <qi.z.zhang at intel.com> wrote:
> 
> Previously, detach port on secondary process will mess primary
> process and cause same device can't be attached again, by take
> advantage of rte_eth_release_port_local, we can support this with
> minor change.

Previously, detach ports on secondary process will mess with the primary
process and cause the device to be not able to attach again. Taking
advantage of the rte_eth_release_port_local call we can fix the problem
with minor changes.

> 
> Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
> ---
> drivers/net/tap/rte_eth_tap.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
> index 5531fe9d9..56d3b6cc9 100644
> --- a/drivers/net/tap/rte_eth_tap.c
> +++ b/drivers/net/tap/rte_eth_tap.c
> @@ -1759,6 +1759,7 @@ rte_pmd_tap_probe(struct rte_vdev_device *dev)
> 		}
> 		/* TODO: request info from primary to set up Rx and Tx */
> 		eth_dev->dev_ops = &ops;
> +		eth_dev->device = &dev->device;
> 		rte_eth_dev_probing_finish(eth_dev);
> 		return 0;
> 	}
> @@ -1827,12 +1828,24 @@ rte_pmd_tap_remove(struct rte_vdev_device *dev)
> {
> 	struct rte_eth_dev *eth_dev = NULL;
> 	struct pmd_internals *internals;
> +	const char *name;
> 	int i;
> 
> +	name = rte_vdev_device_name(dev);
> 	/* find the ethdev entry */
> -	eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
> +	eth_dev = rte_eth_dev_allocated(name);
> 	if (!eth_dev)
> -		return 0;
> +		return -ENODEV;
> +
> +	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
> +		/* detach device on local pprocess only */

/pprocess/process/
> +		if (strlen(rte_vdev_device_args(dev)) == 0)

What does strlen() do with a null string returned by rte_vdev_device_args(), I believe it just returns with zero, but we need to make sure. If it does not then we must protect strlen().

> +			return rte_eth_dev_release_port_local(eth_dev);
> +		/**
> +		 * else this is a private device for current process
> +		 * so continue with normal detach scenario
> +		 */
> +	}
> 
> 	internals = eth_dev->data->dev_private;
> 
> -- 
> 2.13.6
> 

Regards,
Keith