From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Coquelin Subject: [PATCH v3 1/2] vhost: add packed ring support to vring base requests Date: Thu, 18 Oct 2018 11:41:49 +0200 Message-ID: <20181018094150.11219-2-maxime.coquelin@redhat.com> References: <20181018094150.11219-1-maxime.coquelin@redhat.com> Cc: Maxime Coquelin To: dev@dpdk.org, jfreimann@redhat.com, tiwei.bie@intel.com, zhihong.wang@intel.com, jasowang@redhat.com, mst@redhat.com Return-path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id A30D11B120 for ; Thu, 18 Oct 2018 11:42:05 +0200 (CEST) In-Reply-To: <20181018094150.11219-1-maxime.coquelin@redhat.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" For packed ring layout, we need save and restore avail and used indexes, and their wrap counter values. Signed-off-by: Maxime Coquelin --- lib/librte_vhost/vhost_user.c | 41 ++++++++++++++++++++++++++++++----- 1 file changed, 35 insertions(+), 6 deletions(-) diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 508228a3c..ff80bef8e 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -696,10 +696,24 @@ vhost_user_set_vring_base(struct virtio_net **pdev, int main_fd __rte_unused) { struct virtio_net *dev = *pdev; - 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]; + uint64_t val = msg->payload.state.num; + + if (vq_is_packed(dev)) { + /* + * Bit[0:14]: avail index + * Bit[15]: avail wrap counter + * Bit[16:30]: used index + * Bit[31]: used wrap counter + */ + vq->last_avail_idx = val & 0x7fff; + vq->avail_wrap_counter = (val & (0x1 << 15)) >> 15; + vq->last_used_idx = (val & (0x7fff << 16)) >> 16; + vq->used_wrap_counter = (val & (0x1 << 31)) >> 31; + } else { + vq->last_used_idx = msg->payload.state.num; + vq->last_avail_idx = msg->payload.state.num; + } return VH_RESULT_OK; } @@ -1208,6 +1222,7 @@ vhost_user_get_vring_base(struct virtio_net **pdev, { struct virtio_net *dev = *pdev; struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; + uint64_t val; /* We have to stop the queue (virtio) if it is running. */ vhost_destroy_device_notify(dev); @@ -1215,8 +1230,22 @@ vhost_user_get_vring_base(struct virtio_net **pdev, dev->flags &= ~VIRTIO_DEV_READY; dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED; - /* Here we are safe to get the last avail index */ - msg->payload.state.num = vq->last_avail_idx; + /* Here we are safe to get the indexes */ + if (vq_is_packed(dev)) { + /* + * Bit[0:14]: avail index + * Bit[15]: avail wrap counter + * Bit[16:30]: used index + * Bit[31]: used wrap counter + */ + val = vq->last_avail_idx & 0x7fff; + val |= vq->avail_wrap_counter << 15; + val |= (vq->last_used_idx & 0x7fff) << 16; + val |= vq->used_wrap_counter << 31; + msg->payload.state.num = val; + } else { + msg->payload.state.num = vq->last_avail_idx; + } RTE_LOG(INFO, VHOST_CONFIG, "vring base idx:%d file:%d\n", msg->payload.state.index, -- 2.17.1