Re: [PATCH 1/2] net/virtio: do not re-enter clean up routines

[Luca Boccassi <bluca@debian.org>]

On Fri, 2018-11-02 at 12:03 +0100, Maxime Coquelin wrote:
> 
> On 11/2/18 10:57 AM, Maxime Coquelin wrote:
> > 
> > 
> > On 11/1/18 3:45 PM, Luca Boccassi wrote:
> > > On Mon, 2017-07-17 at 19:05 -0400, Charles (Chas) Williams wrote:
> > > > .dev_uninit calls .dev_stop and .dev_close.  The work that is
> > > > done in
> > > > those routines doesn't need repeated.  Use started and opened
> > > > to
> > > > track
> > > > the adapter's status.
> > > > 
> > > > Signed-off-by: Chas Williams <ciwillia@brocade.com>
> > > > ---
> > > >   drivers/net/virtio/virtio_ethdev.c | 15 ++++++++++++---
> > > >   drivers/net/virtio/virtio_pci.h    |  4 +++-
> > > >   2 files changed, 15 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/drivers/net/virtio/virtio_ethdev.c
> > > > b/drivers/net/virtio/virtio_ethdev.c
> > > > index 00a3122..eff0545 100644
> > > > --- a/drivers/net/virtio/virtio_ethdev.c
> > > > +++ b/drivers/net/virtio/virtio_ethdev.c
> > > > @@ -609,6 +609,10 @@ virtio_dev_close(struct rte_eth_dev *dev)
> > > >       PMD_INIT_LOG(DEBUG, "virtio_dev_close");
> > > > +    if (!hw->opened)
> > > > +        return;
> > > > +    hw->opened = false;
> > > > +
> > > >       /* reset the NIC */
> > > >       if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
> > > >           VTPCI_OPS(hw)->set_config_irq(hw,
> > > > VIRTIO_MSI_NO_VECTOR);
> > > > @@ -1696,6 +1700,8 @@ virtio_dev_configure(struct rte_eth_dev
> > > > *dev)
> > > >               return -EBUSY;
> > > >           }
> > > > +    hw->opened = true;
> > > > +
> > > >       return 0;
> > > >   }
> > > > @@ -1759,7 +1765,7 @@ virtio_dev_start(struct rte_eth_dev *dev)
> > > >           VIRTQUEUE_DUMP(txvq->vq);
> > > >       }
> > > > -    hw->started = 1;
> > > > +    hw->started = true;
> > > >       /* Initialize Link state */
> > > >       virtio_dev_link_update(dev, 0);
> > > > @@ -1824,10 +1830,13 @@ virtio_dev_stop(struct rte_eth_dev
> > > > *dev)
> > > >       PMD_INIT_LOG(DEBUG, "stop");
> > > > +    if (!hw->started)
> > > > +        return;
> > > > +    hw->started = false;
> > > > +
> > > >       if (intr_conf->lsc || intr_conf->rxq)
> > > >           rte_intr_disable(dev->intr_handle);
> > > > -    hw->started = 0;
> > > >       memset(&link, 0, sizeof(link));
> > > >       virtio_dev_atomic_write_link_status(dev, &link);
> > > >   }
> > > > @@ -1844,7 +1853,7 @@ virtio_dev_link_update(struct rte_eth_dev
> > > > *dev,
> > > > __rte_unused int wait_to_complet
> > > >       link.link_duplex = ETH_LINK_FULL_DUPLEX;
> > > >       link.link_speed  = SPEED_10G;
> > > > -    if (hw->started == 0) {
> > > > +    if (!hw->started) {
> > > >           link.link_status = ETH_LINK_DOWN;
> > > >       } else if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS)) {
> > > >           PMD_INIT_LOG(DEBUG, "Get link status from hw");
> > > > diff --git a/drivers/net/virtio/virtio_pci.h
> > > > b/drivers/net/virtio/virtio_pci.h
> > > > index 18caebd..65bad2d 100644
> > > > --- a/drivers/net/virtio/virtio_pci.h
> > > > +++ b/drivers/net/virtio/virtio_pci.h
> > > > @@ -35,6 +35,7 @@
> > > >   #define _VIRTIO_PCI_H_
> > > >   #include <stdint.h>
> > > > +#include <stdbool.h>
> > > >   #include <rte_pci.h>
> > > >   #include <rte_ethdev.h>
> > > > @@ -253,7 +254,7 @@ struct virtio_hw {
> > > >       uint64_t    req_guest_features;
> > > >       uint64_t    guest_features;
> > > >       uint32_t    max_queue_pairs;
> > > > -    uint16_t    started;
> > > > +    bool        started;
> > > >       uint16_t    max_mtu;
> > > >       uint16_t    vtnet_hdr_size;
> > > >       uint8_t        vlan_strip;
> > > > @@ -268,6 +269,7 @@ struct virtio_hw {
> > > >       struct virtio_pci_common_cfg *common_cfg;
> > > >       struct virtio_net_config *dev_cfg;
> > > >       void        *virtio_user_dev;
> > > > +    bool        opened;
> > > >       struct virtqueue **vqs;
> > > >   };
> > > 
> > > Hi Maxime,
> > > 
> > > Any chance this could be reviewed and taken care of, please? It's
> > > been
> > > forgotten in the queue for a year, but we still use it.
> > > I have sent 2/2 separately so ignore that (I didn't notice this
> > > series
> > > was still pending review).
> > > 
> > > Thanks!
> > > 
> > 
> > 
> > Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> > 
> > I'll certainly have to rebase it, but it should be trivial.
> > And as discussed on IRC, it fixes a real issue, so will have to be
> > backported to stable. I'll take care of it.
> > 
> > Regards,
> > Maxime
> 
> Applied to dpdk-next-virtio/master
> 
> If you have some time, please have a look at the branch to ensure the
> rebase is correct.
> 
> Thanks,
> Maxime

Looks good to me, thank you very much!

-- 
Kind regards,
Luca Boccassi