From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Coquelin Subject: [PATCH v5 02/15] vhost: add helpers for packed virtqueues Date: Fri, 22 Jun 2018 15:43:14 +0200 Message-ID: <20180622134327.18973-3-maxime.coquelin@redhat.com> References: <20180622134327.18973-1-maxime.coquelin@redhat.com> Cc: mst@redhat.com, jasowang@redhat.com, wexu@redhat.com, Maxime Coquelin To: tiwei.bie@intel.com, zhihong.wang@intel.com, jfreimann@redhat.com, dev@dpdk.org Return-path: Received: from mx1.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by dpdk.org (Postfix) with ESMTP id 632B21BB15 for ; Fri, 22 Jun 2018 15:43:45 +0200 (CEST) In-Reply-To: <20180622134327.18973-1-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" From: Jens Freimann Add some helper functions to check descriptor flags and check if a vring is of type packed. Signed-off-by: Jens Freimann Signed-off-by: Maxime Coquelin --- lib/librte_vhost/vhost.h | 6 ++++++ lib/librte_vhost/virtio-packed.h | 16 ++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index bf2059198..34a614c97 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -319,6 +319,12 @@ struct virtio_net { struct vhost_user_extern_ops extern_ops; } __rte_cache_aligned; +static __rte_always_inline bool +vq_is_packed(struct virtio_net *dev) +{ + return dev->features & (1ull << VIRTIO_F_RING_PACKED); +} + #define VHOST_LOG_PAGE 4096 /* diff --git a/lib/librte_vhost/virtio-packed.h b/lib/librte_vhost/virtio-packed.h index 744b3991b..21fe5045b 100644 --- a/lib/librte_vhost/virtio-packed.h +++ b/lib/librte_vhost/virtio-packed.h @@ -19,4 +19,20 @@ struct vring_desc_packed { uint16_t flags; }; + +static inline int +desc_is_avail(struct vring_desc_packed *desc, uint16_t wrap_counter) +{ + if (wrap_counter == 1) { + if ((desc->flags & VRING_DESC_F_AVAIL) && + !(desc->flags & VRING_DESC_F_USED)) + return 1; + } else { + if (!(desc->flags & VRING_DESC_F_AVAIL) && + (desc->flags & VRING_DESC_F_USED)) + return 1; + } + return 0; +} + #endif /* __VIRTIO_PACKED_H */ -- 2.14.4