[dpdk-dev] [PATCH] eal: fix device hotplug

[David Marchand]

On Tue, Nov 2, 2021 at 10:35 AM Jiang, YuX <yux.jiang at intel.com> wrote:
> > -----Original Message-----
> > From: David Marchand <david.marchand at redhat.com>
> > Sent: Tuesday, November 2, 2021 3:53 PM
> > To: dev at dpdk.org
> > Cc: Jiang, YuX <yux.jiang at intel.com>; Harman Kalra <hkalra at marvell.com>
> > Subject: [PATCH] eal: fix device hotplug
> >
> > The device event interrupt handler was always freed.
> >
> > Bugzilla ID: 845
> > Fixes: c2bd9367e18f ("lib: remove direct access to interrupt handle")
> >
> > Signed-off-by: David Marchand <david.marchand at redhat.com>
> > ---
> >  lib/eal/linux/eal_dev.c | 12 +++++++++---
> >  1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/lib/eal/linux/eal_dev.c b/lib/eal/linux/eal_dev.c index
> > 06820a3666..925cdba553 100644
> > --- a/lib/eal/linux/eal_dev.c
> > +++ b/lib/eal/linux/eal_dev.c
> > @@ -317,10 +317,12 @@ rte_dev_event_monitor_start(void)
> >               goto exit;
> >       }
> >
> > -     if (rte_intr_type_set(intr_handle, RTE_INTR_HANDLE_DEV_EVENT))
> > +     ret = rte_intr_type_set(intr_handle,
> > RTE_INTR_HANDLE_DEV_EVENT);
> > +     if (ret)
> >               goto exit;
> >
> > -     if (rte_intr_fd_set(intr_handle, -1))
> > +     ret = rte_intr_fd_set(intr_handle, -1);
> > +     if (ret)
> >               goto exit;
> >
> >       ret = dev_uev_socket_fd_create();
> > @@ -339,7 +341,10 @@ rte_dev_event_monitor_start(void)
> >       monitor_refcount++;
> >
> >  exit:
> > -     rte_intr_instance_free(intr_handle);
> > +     if (ret) {
> > +             rte_intr_instance_free(intr_handle);
> > +             intr_handle = NULL;
> > +     }
> >       rte_rwlock_write_unlock(&monitor_lock);
> >       return ret;
> >  }
> > @@ -370,6 +375,7 @@ rte_dev_event_monitor_stop(void)
> >
> >       close(rte_intr_fd_get(intr_handle));
> >       rte_intr_instance_free(intr_handle);
> > +     intr_handle = NULL;
> >
> >       monitor_refcount--;
> >
> > --
> > 2.23.0
> Hi David,
>
> The patch https://patchwork.dpdk.org/project/dpdk/patch/20211102075259.3392-1-david.marchand@redhat.com/
> failed to verify.
>
> after executing "device_del dev1" in the qemu window, the testpmd window hangs to death and output as following:
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)
> EAL: Cannot find bus for device (0000:00:05.0)

Replying on the ml, since the discussion mainly happened in bugzilla.
This first patch was not enough, another issue was caught in the pci
bus hotplug code.


-- 
David Marchand