From patchwork Fri Mar 16 15:21:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Freimann X-Patchwork-Id: 36166 X-Patchwork-Delegate: maxime.coquelin@redhat.com Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 1BC767F0C; Fri, 16 Mar 2018 16:22:12 +0100 (CET) Received: from mx1.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by dpdk.org (Postfix) with ESMTP id AD8335F2B for ; Fri, 16 Mar 2018 16:22:11 +0100 (CET) Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9D69B402277A; Fri, 16 Mar 2018 15:22:10 +0000 (UTC) Received: from localhost (dhcp-192-241.str.redhat.com [10.33.192.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 025B410B00B0; Fri, 16 Mar 2018 15:22:03 +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: Fri, 16 Mar 2018 16:21:14 +0100 Message-Id: <20180316152120.13199-12-jfreimann@redhat.com> In-Reply-To: <20180316152120.13199-1-jfreimann@redhat.com> References: <20180316152120.13199-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Mar 2018 15:22:10 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 16 Mar 2018 15:22:10 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jfreimann@redhat.com' RCPT:'' Subject: [dpdk-dev] [PATCH 11/17] 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: , Errors-To: dev-bounces@dpdk.org Sender: "dev" 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 | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/lib/librte_vhost/virtio-1.1.h b/lib/librte_vhost/virtio-1.1.h index b37d621..7b37d26 100644 --- a/lib/librte_vhost/virtio-1.1.h +++ b/lib/librte_vhost/virtio-1.1.h @@ -17,4 +17,47 @@ 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 (unlikely(!vq)) + return -1; + + if (vq->used_wrap_counter == 1) + if ((desc->flags & DESC_AVAIL) && !(desc->flags & DESC_USED)) + return 1; + if (vq->used_wrap_counter == 0) + if (!(desc->flags & DESC_AVAIL) && (desc->flags & DESC_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 |= DESC_USED; + flags |= DESC_AVAIL; + } else { + flags &= ~DESC_USED; + flags &= ~DESC_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 */