From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id DEF801B7C9 for ; Mon, 29 Jan 2018 15:13:10 +0100 (CET) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 387B24E05D; Mon, 29 Jan 2018 14:13:10 +0000 (UTC) Received: from localhost (dhcp-192-241.str.redhat.com [10.33.192.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id F39BE7A033; Mon, 29 Jan 2018 14:13:04 +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: Mon, 29 Jan 2018 15:11:40 +0100 Message-Id: <20180129141143.13437-12-jfreimann@redhat.com> In-Reply-To: <20180129141143.13437-1-jfreimann@redhat.com> References: <20180129141143.13437-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Mon, 29 Jan 2018 14:13:10 +0000 (UTC) Subject: [dpdk-dev] [PATCH 11/14] 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: Mon, 29 Jan 2018 14:13:11 -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 | 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 5ca0bc33f..84039797e 100644 --- a/lib/librte_vhost/virtio-1.1.h +++ b/lib/librte_vhost/virtio-1.1.h @@ -17,4 +17,47 @@ struct vring_desc_1_1 { 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_1_1 *desc) +{ + if (!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_1_1 *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_1_1 *desc) +{ + _set_desc_used(desc, vq->used_wrap_counter); +} + #endif /* __VIRTIO_1_1_H */ -- 2.14.3