> -----Original Message-----
> From: Xia, Chenbo <[email protected]>
> Sent: 2020?7?29? 10:53
> To: Maxime Coquelin <[email protected]>; [email protected];
> [email protected]; Liu, Yong <[email protected]>; Wang, Yinan
> <[email protected]>
> Cc: [email protected]; Yigit, Ferruh <[email protected]>;
> [email protected]
> Subject: RE: [PATCH v2 2/3] net/vhost: fix queue update
>
>
> > -----Original Message-----
> > From: Maxime Coquelin <[email protected]>
> > Sent: Wednesday, July 29, 2020 12:50 AM
> > To: [email protected]; [email protected]; Xia, Chenbo
> > <[email protected]>; Liu, Yong <[email protected]>; Wang, Yinan
> > <[email protected]>
> > Cc: [email protected]; Yigit, Ferruh <[email protected]>;
> > [email protected]; Maxime Coquelin
> > <[email protected]>
> > Subject: [PATCH v2 2/3] net/vhost: fix queue update
> >
> > Now that the vhost library saves the guest notifications enablement value
> in its
> > virtqueues metadata, it is not necessary to do it in the vring_state_changed
> > callback.
> >
> > One effect of the patch is also to prevent possible deadlock happening in
> vhost
> > library.
> >
> > Fixes: 604052ae5395 ("net/vhost: support queue update")
> >
> > Reported-by: Yinan Wang <[email protected]>
> > Tested-by: Yinan Wang <[email protected]>
> > Signed-off-by: Maxime Coquelin <[email protected]>
> > ---
> > drivers/net/vhost/rte_eth_vhost.c | 28 +++++++++-------------------
> > 1 file changed, 9 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/net/vhost/rte_eth_vhost.c
> > b/drivers/net/vhost/rte_eth_vhost.c
> > index bbf79b2c0e..951929c663 100644
> > --- a/drivers/net/vhost/rte_eth_vhost.c
> > +++ b/drivers/net/vhost/rte_eth_vhost.c
> > @@ -94,7 +94,6 @@ struct vhost_queue {
> > struct rte_mempool *mb_pool;
> > uint16_t port;
> > uint16_t virtqueue_id;
> > - bool intr_en;
> > struct vhost_stats stats;
> > };
> >
> > @@ -547,8 +546,6 @@ eth_rxq_intr_enable(struct rte_eth_dev *dev,
> uint16_t
> > qid)
> > rte_vhost_enable_guest_notification(vq->vid, (qid << 1) + 1, 1);
> > rte_wmb();
> >
> > - vq->intr_en = true;
> > -
> > return ret;
> > }
> >
> > @@ -574,8 +571,6 @@ eth_rxq_intr_disable(struct rte_eth_dev *dev,
> uint16_t
> > qid)
> > rte_vhost_enable_guest_notification(vq->vid, (qid << 1) + 1, 0);
> > rte_wmb();
> >
> > - vq->intr_en = false;
> > -
> > return 0;
> > }
> >
> > @@ -841,7 +836,6 @@ vring_conf_update(int vid, struct rte_eth_dev
> *eth_dev,
> > uint16_t vring_id)
> > struct rte_eth_conf *dev_conf = ð_dev->data->dev_conf;
> > struct pmd_internal *internal = eth_dev->data->dev_private;
> > struct rte_vhost_vring vring;
> > - struct vhost_queue *vq;
> > int rx_idx = vring_id % 2 ? (vring_id - 1) >> 1 : -1;
> > int ret = 0;
> >
> > @@ -853,21 +847,17 @@ vring_conf_update(int vid, struct rte_eth_dev
> > *eth_dev, uint16_t vring_id)
> > rte_atomic32_read(&internal->dev_attached) &&
> > rte_atomic32_read(&internal->started) &&
> > dev_conf->intr_conf.rxq) {
> > - vq = eth_dev->data->rx_queues[rx_idx];
> > ret = rte_vhost_get_vhost_vring(vid, vring_id, &vring);
> > - if (!ret) {
> > - if (vring.kickfd !=
> > - eth_dev->intr_handle->efds[rx_idx]) {
> > - VHOST_LOG(INFO,
> > - "kickfd for rxq-%d was changed.\n",
> > - rx_idx);
> > - eth_dev->intr_handle->efds[rx_idx] =
> > - vring.kickfd;
> > - }
> > + if (ret) {
> > + VHOST_LOG(ERR, "Failed to get vring %d
> > information.\n",
> > + vring_id);
> > + return ret;
> > + }
> >
> > - rte_vhost_enable_guest_notification(vid, vring_id,
> > - vq->intr_en);
> > - rte_wmb();
> > + if (vring.kickfd != eth_dev->intr_handle->efds[rx_idx]) {
> > + VHOST_LOG(INFO, "kickfd for rxq-%d was
> changed.\n",
> > + rx_idx);
> > + eth_dev->intr_handle->efds[rx_idx] = vring.kickfd;
> > }
> > }
> >
> > --
> > 2.26.2
>
> Reviewed-by: Chenbo Xia <[email protected]>
Tested-by: Yinan Wang <[email protected]>
