[dpdk-dev] [PATCH] net/tap: release port upon close
wangyunjian
wangyunjian at huawei.com
Thu Sep 17 14:35:36 CEST 2020
> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas at monjalon.net]
> Sent: Sunday, September 13, 2020 5:17 PM
> To: wangyunjian <wangyunjian at huawei.com>
> Cc: dev at dpdk.org; ferruh.yigit at intel.com; Lilijun (Jerry)
> <jerry.lilijun at huawei.com>; xudingke <xudingke at huawei.com>;
> keith.wiles at intel.com
> Subject: Re: [dpdk-dev] [PATCH] net/tap: release port upon close
>
> Hi,
>
> 28/08/2020 14:37, wangyunjian:
> > @@ -1078,6 +1085,23 @@ tap_dev_close(struct rte_eth_dev *dev)
> > +
> > + /* mac_addrs must not be freed alone because part of dev_private */
> > + dev->data->mac_addrs = NULL;
> > +
> > + internals = dev->data->dev_private;
> > + TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
> > + tuntap_types[internals->type], rte_socket_id());
> > +
> > + if (internals->ioctl_sock != -1) {
> > + close(internals->ioctl_sock);
> > + internals->ioctl_sock = -1;
> > + }
> > + rte_free(dev->process_private);
> > + dev->process_private = NULL;
> > + if (tap_devices_count == 1)
> > + rte_mp_action_unregister(TAP_MP_KEY);
> > + tap_devices_count--;
> > }
> [...]
> > @@ -2446,12 +2466,11 @@ static int
> > rte_pmd_tap_remove(struct rte_vdev_device *dev) {
> >
> > struct rte_eth_dev *eth_dev = NULL;
> >
> > - struct pmd_internals *internals;
> >
> > /* find the ethdev entry */
> > eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
> > if (!eth_dev)
> >
> > - return -ENODEV;
> > + return 0;
> >
> > /* mac_addrs must not be freed alone because part of dev_private
> */
> > eth_dev->data->mac_addrs = NULL;
>
> The line above can be removed because mac_addrs is not freed in secondary
> process, and it is redundant with tap_dev_close().
Thanks for the suggestion.
I have fixed it in v2.
https://patchwork.dpdk.org/patch/78048/
>
> >
> > if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> > return rte_eth_dev_release_port(eth_dev);
>
> There is an inconsistency in secondary process if tap_dev_close() is not called
> from .remove (unplug) but can be called from .dev_close (rte_eth_dev_close).
>
> I think the process type check must be done inside tap_dev_close(), so the
> process private resources can be freed.
>
> >
> > tap_dev_close(eth_dev);
> >
>
> This blank line can be removed in my opinion.
OK
>
> > - internals = eth_dev->data->dev_private;
> > - TAP_LOG(DEBUG, "Closing %s Ethernet device on numa %u",
> > - tuntap_types[internals->type], rte_socket_id());
> > -
> > - close(internals->ioctl_sock);
> > - rte_free(eth_dev->process_private);
> > - if (tap_devices_count == 1)
> > - rte_mp_action_unregister(TAP_MP_KEY);
> > - tap_devices_count--;
> > rte_eth_dev_release_port(eth_dev);
> >
> > return 0;
>
>
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