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From: Marvin Liu <yong.liu@intel.com>
To: maxime.coquelin@redhat.com,
tiwei.bie@intel.com,
zhihong.wang@intel.com
Cc: dev@dpdk.org,
Marvin Liu <yong.liu@intel.com>
Date: Fri, 20 Sep 2019 00:36:28 +0800
Message-Id: <20190919163643.24130-2-yong.liu@intel.com>
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<20190919163643.24130-1-yong.liu@intel.com>
Subject: [dpdk-dev] [PATCH v2 01/16] vhost: add single packet enqueue
function
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Add vhost enqueue function for single packet and meanwhile left space
for flush used ring function.
Signed-off-by: Marvin Liu <yong.liu@intel.com>
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 5b85b832d..2b5c47145 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -774,6 +774,70 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
return error;
}
+/*
+ * Returns -1 on fail, 0 on success
+ */
+static __rte_always_inline int
+vhost_enqueue_single_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mbuf *pkt, struct buf_vector *buf_vec, uint16_t *nr_descs)
+{
+ uint16_t nr_vec = 0;
+
+ uint16_t avail_idx;
+ uint16_t max_tries, tries = 0;
+
+ uint16_t buf_id = 0;
+ uint32_t len = 0;
+ uint16_t desc_count;
+
+ uint32_t size = pkt->pkt_len + dev->vhost_hlen;
+ avail_idx = vq->last_avail_idx;
+
+ if (rxvq_is_mergeable(dev))
+ max_tries = vq->size - 1;
+ else
+ max_tries = 1;
+
+ uint16_t num_buffers = 0;
+
+ while (size > 0) {
+ /*
+ * if we tried all available ring items, and still
+ * can't get enough buf, it means something abnormal
+ * happened.
+ */
+ if (unlikely(++tries > max_tries))
+ return -1;
+
+ if (unlikely(fill_vec_buf_packed(dev, vq,
+ avail_idx, &desc_count,
+ buf_vec, &nr_vec,
+ &buf_id, &len,
+ VHOST_ACCESS_RW) < 0)) {
+ return -1;
+ }
+
+ len = RTE_MIN(len, size);
+
+ size -= len;
+
+ avail_idx += desc_count;
+ if (avail_idx >= vq->size)
+ avail_idx -= vq->size;
+
+ *nr_descs += desc_count;
+ num_buffers += 1;
+ }
+
+ if (copy_mbuf_to_desc(dev, vq, pkt,
+ buf_vec, nr_vec,
+ num_buffers) < 0) {
+ return 0;
+ }
+
+ return 0;
+}
+
static __rte_noinline uint32_t
virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
struct rte_mbuf **pkts, uint32_t count)
@@ -831,6 +895,35 @@ virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
return pkt_idx;
}
+static __rte_unused int16_t
+virtio_dev_rx_single_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct rte_mbuf *pkt)
+{
+ struct buf_vector buf_vec[BUF_VECTOR_MAX];
+ uint16_t nr_descs = 0;
+
+ rte_smp_rmb();
+ if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
+ &nr_descs) < 0)) {
+ VHOST_LOG_DEBUG(VHOST_DATA,
+ "(%d) failed to get enough desc from vring\n",
+ dev->vid);
+ return -1;
+ }
+
+ VHOST_LOG_DEBUG(VHOST_DATA, "(%d) current index %d | end index %d\n",
+ dev->vid, vq->last_avail_idx,
+ vq->last_avail_idx + nr_descs);
+
+ vq->last_avail_idx += nr_descs;
+ if (vq->last_avail_idx >= vq->size) {
+ vq->last_avail_idx -= vq->size;
+ vq->avail_wrap_counter ^= 1;
+ }
+
+ return 0;
+}
+
static __rte_noinline uint32_t
virtio_dev_rx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
struct rte_mbuf **pkts, uint32_t count)
--
2.17.1