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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: tiwei.bie@intel.com, zhihong.wang@intel.com, jfreimann@redhat.com,
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Cc: mst@redhat.com, jasowang@redhat.com, wexu@redhat.com,
Maxime Coquelin <maxime.coquelin@redhat.com>
Date: Fri, 6 Jul 2018 09:07:17 +0200
Message-Id: <20180706070722.2043-11-maxime.coquelin@redhat.com>
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Subject: [dpdk-dev] [PATCH v9 10/15] vhost: create descriptor mapping
function
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/virtio_net.c | 70 ++++++++++++++++++++++++-------------------
1 file changed, 40 insertions(+), 30 deletions(-)
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 44b9daf4a..058786871 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -291,6 +291,40 @@ virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
}
}
+static __rte_always_inline int
+map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
+ struct buf_vector *buf_vec, uint16_t *vec_idx,
+ uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
+{
+ uint16_t vec_id = *vec_idx;
+
+ while (desc_len) {
+ uint64_t desc_addr;
+ uint64_t desc_chunck_len = desc_len;
+
+ if (unlikely(vec_id >= BUF_VECTOR_MAX))
+ return -1;
+
+ desc_addr = vhost_iova_to_vva(dev, vq,
+ desc_iova,
+ &desc_chunck_len,
+ perm);
+ if (unlikely(!desc_addr))
+ return -1;
+
+ buf_vec[vec_id].buf_iova = desc_iova;
+ buf_vec[vec_id].buf_addr = desc_addr;
+ buf_vec[vec_id].buf_len = desc_chunck_len;
+
+ desc_len -= desc_chunck_len;
+ desc_iova += desc_chunck_len;
+ vec_id++;
+ }
+ *vec_idx = vec_id;
+
+ return 0;
+}
+
static __rte_always_inline int
fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint32_t avail_idx, uint16_t *vec_idx,
@@ -300,7 +334,7 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
uint16_t vec_id = *vec_idx;
uint32_t len = 0;
- uint64_t dlen, desc_avail, desc_iova;
+ uint64_t dlen;
struct vring_desc *descs = vq->desc;
struct vring_desc *idesc = NULL;
@@ -337,37 +371,13 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
return -1;
}
-
len += descs[idx].len;
- desc_avail = descs[idx].len;
- desc_iova = descs[idx].addr;
-
- while (desc_avail) {
- uint64_t desc_addr;
- uint64_t desc_chunck_len = desc_avail;
-
- if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
- free_ind_table(idesc);
- return -1;
- }
- desc_addr = vhost_iova_to_vva(dev, vq,
- desc_iova,
- &desc_chunck_len,
- perm);
- if (unlikely(!desc_addr)) {
- free_ind_table(idesc);
- return -1;
- }
-
- buf_vec[vec_id].buf_iova = desc_iova;
- buf_vec[vec_id].buf_addr = desc_addr;
- buf_vec[vec_id].buf_len = desc_chunck_len;
- buf_vec[vec_id].desc_idx = idx;
-
- desc_avail -= desc_chunck_len;
- desc_iova += desc_chunck_len;
- vec_id++;
+ if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
+ descs[idx].addr, descs[idx].len,
+ perm))) {
+ free_ind_table(idesc);
+ return -1;
}
if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
--
2.14.4