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 BE6694C9D for ; Thu, 6 Sep 2018 20:20:11 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 646D42BCA9; Thu, 6 Sep 2018 18:20:11 +0000 (UTC) Received: from localhost (ovpn-116-129.ams2.redhat.com [10.36.116.129]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 47753FA986; Thu, 6 Sep 2018 18:20:07 +0000 (UTC) From: Jens Freimann To: dev@dpdk.org Cc: tiwei.bie@intel.com, maxime.coquelin@redhat.com Date: Thu, 6 Sep 2018 19:19:39 +0100 Message-Id: <20180906181947.20646-4-jfreimann@redhat.com> In-Reply-To: <20180906181947.20646-1-jfreimann@redhat.com> References: <20180906181947.20646-1-jfreimann@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 06 Sep 2018 18:20:11 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 06 Sep 2018 18:20:11 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'jfreimann@redhat.com' RCPT:'' Subject: [dpdk-dev] [PATCH v5 03/11] net/virtio: add packed virtqueue helpers 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, 06 Sep 2018 18:20:12 -0000 Add helper functions to set/clear and check descriptor flags. Signed-off-by: Jens Freimann --- drivers/net/virtio/virtio_ring.h | 26 ++++++++++++++++++++++++++ drivers/net/virtio/virtqueue.h | 19 +++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h index e2c597434..f3b23f419 100644 --- a/drivers/net/virtio/virtio_ring.h +++ b/drivers/net/virtio/virtio_ring.h @@ -78,6 +78,8 @@ struct vring_packed_desc_event { struct vring { unsigned int num; + unsigned int avail_wrap_counter; + unsigned int used_wrap_counter; union { struct vring_desc_packed *desc_packed; struct vring_desc *desc; @@ -92,6 +94,30 @@ struct vring { }; }; +static inline void +_set_desc_avail(struct vring_desc_packed *desc, int wrap_counter) +{ + desc->flags |= VRING_DESC_F_AVAIL(wrap_counter) | + VRING_DESC_F_USED(!wrap_counter); +} + +static inline void +set_desc_avail(struct vring *vr, struct vring_desc_packed *desc) +{ + _set_desc_avail(desc, vr->avail_wrap_counter); +} + +static inline int +desc_is_used(struct vring_desc_packed *desc, struct vring *vr) +{ + uint16_t used, avail; + + used = !!(desc->flags & VRING_DESC_F_USED(1)); + avail = !!(desc->flags & VRING_DESC_F_AVAIL(1)); + + return used == avail && used == vr->used_wrap_counter; +} + /* The standard layout for the ring is a continuous chunk of memory which * looks like this. We assume num is a power of 2. * diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h index d2a0b651a..53fce61b4 100644 --- a/drivers/net/virtio/virtqueue.h +++ b/drivers/net/virtio/virtqueue.h @@ -245,6 +245,25 @@ struct virtio_tx_region { __attribute__((__aligned__(16))); }; +static inline uint16_t +increment_pq_index(uint16_t idx, size_t ring_size) +{ + return ++idx >= ring_size ? 0 : idx; +} + +static inline uint16_t +update_pq_avail_index(struct virtqueue *vq) +{ + uint16_t idx; + + idx = increment_pq_index(vq->vq_avail_idx, vq->vq_nentries); + if (idx == 0) + vq->vq_ring.avail_wrap_counter ^= 1; + vq->vq_avail_idx = idx; + + return vq->vq_avail_idx; +} + static inline void vring_desc_init_packed(struct vring *vr, int n) { -- 2.17.1