From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by dpdk.org (Postfix) with ESMTP id ADA091CACB for ; Thu, 5 Apr 2018 12:11:25 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4EAA7722EA; Thu, 5 Apr 2018 10:11:25 +0000 (UTC) Received: from localhost (dhcp-192-241.str.redhat.com [10.33.192.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id F0D0C215CDAF; Thu, 5 Apr 2018 10:11:24 +0000 (UTC) From: Jens Freimann To: dev@dpdk.org Cc: tiwei.bie@intel.com, yliu@fridaylinux.org, maxime.coquelin@redhat.com, mst@redhat.com Date: Thu, 5 Apr 2018 12:10:23 +0200 Message-Id: <20180405101031.26468-14-jfreimann@redhat.com> In-Reply-To: <20180405101031.26468-1-jfreimann@redhat.com> References: <20180405101031.26468-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 05 Apr 2018 10:11:25 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 05 Apr 2018 10:11:25 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jfreimann@redhat.com' RCPT:'' Subject: [dpdk-dev] [PATCH v3 13/21] vhost: add helpers for packed virtqueues X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Apr 2018 10:11:26 -0000 Add some helper functions to set/check descriptor flags and toggle the used wrap counter. Signed-off-by: Jens Freimann --- lib/librte_vhost/virtio-1.1.h | 44 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/lib/librte_vhost/virtio-1.1.h b/lib/librte_vhost/virtio-1.1.h index 7b48caed7..e77d7aa6c 100644 --- a/lib/librte_vhost/virtio-1.1.h +++ b/lib/librte_vhost/virtio-1.1.h @@ -15,4 +15,48 @@ struct vring_desc_packed { uint16_t flags; }; +static inline void +toggle_wrap_counter(struct vhost_virtqueue *vq) +{ + vq->used_wrap_counter ^= 1; +} + +static inline int +desc_is_avail(struct vhost_virtqueue *vq, struct vring_desc_packed *desc) +{ + if (vq->used_wrap_counter == 1) { + if ((desc->flags & VRING_DESC_F_AVAIL) && + !(desc->flags & VRING_DESC_F_USED)) + return 1; + } + if (vq->used_wrap_counter == 0) { + if (!(desc->flags & VRING_DESC_F_AVAIL) && + (desc->flags & VRING_DESC_F_USED)) + return 1; + } + return 0; +} + +static inline void +_set_desc_used(struct vring_desc_packed *desc, int wrap_counter) +{ + uint16_t flags = desc->flags; + + if (wrap_counter == 1) { + flags |= VRING_DESC_F_USED; + flags |= VRING_DESC_F_AVAIL; + } else { + flags &= ~VRING_DESC_F_USED; + flags &= ~VRING_DESC_F_AVAIL; + } + + desc->flags = flags; +} + +static inline void +set_desc_used(struct vhost_virtqueue *vq, struct vring_desc_packed *desc) +{ + _set_desc_used(desc, vq->used_wrap_counter); +} + #endif /* __VIRTIO_PACKED_H */ -- 2.14.3