Re: [dpdk-dev] [PATCH v3 2/2] ethdev: complete closing of port

[Thomas Monjalon <thomas@monjalon.net>]

16/10/2018 13:24, Andrew Rybchenko:
> On 10/15/18 2:20 AM, Thomas Monjalon wrote:
> > After closing a port, it cannot be restarted.
> > So there is no reason to not free all associated resources.
> >
> > The last step was done with rte_eth_dev_detach() which is deprecated.
> > Instead of blindly removing the associated rte_device, the driver should
> > check if no more port (ethdev, cryptodev, etc) is open for the device.
> >
> > The last ethdev freeing which were done by rte_eth_dev_detach(),
> > are now done at the end of rte_eth_dev_close().
> >
> > If the driver is trying to free the port again, the function
> > rte_eth_dev_release_port() will abort with -ENODEV error.
> >
> > Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> > ---
> >   drivers/net/bnxt/bnxt_ethdev.c    | 4 ----
> >   drivers/net/vhost/rte_eth_vhost.c | 4 ----
> >   lib/librte_ethdev/rte_ethdev.c    | 9 +++------
> >   lib/librte_ethdev/rte_ethdev.h    | 3 +--
> >   4 files changed, 4 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
> > index ff41cb0fa..183b40821 100644
> > --- a/drivers/net/bnxt/bnxt_ethdev.c
> > +++ b/drivers/net/bnxt/bnxt_ethdev.c
> > @@ -712,10 +712,6 @@ static void bnxt_dev_close_op(struct rte_eth_dev *eth_dev)
> >   	if (bp->dev_stopped == 0)
> >   		bnxt_dev_stop_op(eth_dev);
> >   
> > -	if (eth_dev->data->mac_addrs != NULL) {
> > -		rte_free(eth_dev->data->mac_addrs);
> > -		eth_dev->data->mac_addrs = NULL;
> > -	}
> >   	if (bp->grp_info != NULL) {
> >   		rte_free(bp->grp_info);
> >   		bp->grp_info = NULL;
> > diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
> > index 986bf9633..b9cefbbe5 100644
> > --- a/drivers/net/vhost/rte_eth_vhost.c
> > +++ b/drivers/net/vhost/rte_eth_vhost.c
> > @@ -998,12 +998,8 @@ eth_dev_close(struct rte_eth_dev *dev)
> >   		for (i = 0; i < dev->data->nb_tx_queues; i++)
> >   			rte_free(dev->data->tx_queues[i]);
> >   
> > -	rte_free(dev->data->mac_addrs);
> >   	free(internal->dev_name);
> >   	free(internal->iface_name);
> > -	rte_free(internal);
> > -
> > -	dev->data->dev_private = NULL;
> >   }
> >   
> >   static int
> 
> It looks like above snippets should be a part of previous changeset.

No, this is related to close function.

> > --- a/lib/librte_ethdev/rte_ethdev.c
> > +++ b/lib/librte_ethdev/rte_ethdev.c
> > @@ -367,6 +367,8 @@ rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
> >   {
> >   	if (eth_dev == NULL)
> >   		return -EINVAL;
> > +	if (eth_dev->state == RTE_ETH_DEV_UNUSED)
> > +		return -ENODEV;
> >   
> >   	rte_eth_dev_shared_data_prepare();
> >   
> > @@ -1384,12 +1386,7 @@ rte_eth_dev_close(uint16_t port_id)
> >   	dev->data->dev_started = 0;
> >   	(*dev->dev_ops->dev_close)(dev);
> >   
> > -	dev->data->nb_rx_queues = 0;
> > -	rte_free(dev->data->rx_queues);
> > -	dev->data->rx_queues = NULL;
> > -	dev->data->nb_tx_queues = 0;
> > -	rte_free(dev->data->tx_queues);
> > -	dev->data->tx_queues = NULL;
> > +	rte_eth_dev_release_port(dev);
> >   }
> >   
> >   int
> 
> Right now it introduces resource leak for resources which are
> freed by PCI drivers in uninit.

No, these resources are freed by rte_eth_dev_release_port.