From: Jens Freimann <jfreiman@redhat.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, tiwei.bie@intel.com, zhihong.wang@intel.com
Subject: Re: [dpdk-dev] [RFC 1/2] vhost: add packed ring support to vring base requests
Date: Fri, 10 Aug 2018 09:09:02 +0200 [thread overview]
Message-ID: <20180810070902.we3jf4xfpbgu5vst@jenstp.localdomain> (raw)
In-Reply-To: <20180808152323.9660-2-maxime.coquelin@redhat.com>
On Wed, Aug 08, 2018 at 05:23:22PM +0200, Maxime Coquelin wrote:
>For consistency with Vhost kernel backend, save the wrap
>counter value into bit 31 of num's vring state field.
>
>Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>---
> lib/librte_vhost/vhost_user.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
>diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
>index a2d4c9ffc..31cfdf163 100644
>--- a/lib/librte_vhost/vhost_user.c
>+++ b/lib/librte_vhost/vhost_user.c
>@@ -648,10 +648,15 @@ static int
> vhost_user_set_vring_base(struct virtio_net *dev,
> VhostUserMsg *msg)
> {
>- dev->virtqueue[msg->payload.state.index]->last_used_idx =
>- msg->payload.state.num;
>- dev->virtqueue[msg->payload.state.index]->last_avail_idx =
>- msg->payload.state.num;
>+ struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
>+ if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
>+ vq->avail_wrap_counter = msg->payload.state.num >> 31;
>+ vq->used_wrap_counter = vq->avail_wrap_counter;
Maybe I don't understand when this is called, but the wrap counters
could have different values, no?
Apart from that:
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
regards,
Jens
next prev parent reply other threads:[~2018-08-10 7:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-08 15:23 [dpdk-dev] [RFC 0/2] vhost: packed ring support completion Maxime Coquelin
2018-08-08 15:23 ` [dpdk-dev] [RFC 1/2] vhost: add packed ring support to vring base requests Maxime Coquelin
2018-08-10 7:09 ` Jens Freimann [this message]
2018-08-14 12:09 ` Maxime Coquelin
2018-08-08 15:23 ` [dpdk-dev] [RFC 2/2] vhost: advertize packed ring layout support Maxime Coquelin
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