> -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of linhaifeng > Sent: Thursday, January 29, 2015 6:30 PM > To: dev at dpdk.org > Subject: [dpdk-dev] [PATCH] vhost: notify guest to fill buffer when there is > no > buffer > > From: Linhaifeng <haifeng.lin at huawei.com> > > If we found there is no buffer we should notify virtio_net to > fill buffers. > > We use mz send buffers from VM to VM,found that the other VM > stop to receive data after many hours. > > Signed-off-by: Linhaifeng <haifeng.lin at huawei.com> > --- > lib/librte_vhost/vhost_rxtx.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/lib/librte_vhost/vhost_rxtx.c b/lib/librte_vhost/vhost_rxtx.c > index ccfd82f..013c526 100644 > --- a/lib/librte_vhost/vhost_rxtx.c > +++ b/lib/librte_vhost/vhost_rxtx.c > @@ -87,9 +87,14 @@ virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id, > /*check that we have enough buffers*/ > if (unlikely(count > free_entries)) > count = free_entries; > - > - if (count == 0) > + /* If there is no buffers we should notify guest to fill. > + * This is need when guest use virtio_net driver(not pmd). > + */ > + if (count == 0) { > + if (!(vq->avail->flags & > VRING_AVAIL_F_NO_INTERRUPT)) > + eventfd_write((int)vq->kickfd, 1); > return 0; > + }
Haifeng: Is it the root cause and is it protocol required? Could you give a detailed description for that scenario? > > res_end_idx = res_base_idx + count; > /* vq->last_used_idx_res is atomically updated. */ > -- > 1.9.0 >
