In preparation for subsequent patches, move mbuf allocation out and
rename virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
function now receives an already allocated mbuf pointer.
Signed-off-by: Balazs Nemeth <bnem...@redhat.com>
---
lib/librte_vhost/virtio_net.c | 54 ++++++++++++++++++++++++++---------
1 file changed, 40 insertions(+), 14 deletions(-)
diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 7f621fb6d..666e7fdb8 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2166,6 +2166,23 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct
rte_mempool *mp,
return NULL;
}
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+ uint32_t data_len)
+{
+ if (rte_pktmbuf_tailroom(pkt) >= data_len)
+ return 0;
+
+ /* attach an external buffer if supported */
+ if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+ return 0;
+
+ /* check if chained buffers are allowed */
+ if (!dev->linearbuf)
+ return 0;
+ return 1;
+}
+
static __rte_noinline uint16_t
virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
@@ -2259,7 +2276,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct
vhost_virtqueue *vq,
static __rte_always_inline int
vhost_reserve_avail_batch_packed(struct virtio_net *dev,
struct vhost_virtqueue *vq,
- struct rte_mempool *mbuf_pool,
struct rte_mbuf **pkts,
uint16_t avail_idx,
uintptr_t *desc_addrs,
@@ -2304,8 +2320,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
}
vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
- pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
- if (!pkts[i])
+ if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
goto free_buf;
}
@@ -2326,16 +2341,12 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
return 0;
free_buf:
- for (i = 0; i < PACKED_BATCH_SIZE; i++)
- rte_pktmbuf_free(pkts[i]);
-
return -1;
}
static __rte_always_inline int
virtio_dev_tx_batch_packed(struct virtio_net *dev,
struct vhost_virtqueue *vq,
- struct rte_mempool *mbuf_pool,
struct rte_mbuf **pkts)
{
uint16_t avail_idx = vq->last_avail_idx;
@@ -2345,8 +2356,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
uint16_t ids[PACKED_BATCH_SIZE];
uint16_t i;
- if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
- avail_idx, desc_addrs, ids))
+ if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+ desc_addrs, ids))
return -1;
vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2396,8 +2407,8 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
VHOST_ACCESS_RO) < 0))
return -1;
- *pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
- if (unlikely(*pkts == NULL)) {
+
+ if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
if (!allocerr_warned) {
VHOST_LOG_DATA(ERR,
"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2416,7 +2427,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
dev->ifname);
allocerr_warned = true;
}
- rte_pktmbuf_free(*pkts);
return -1;
}
@@ -2459,22 +2469,38 @@ virtio_dev_tx_packed(struct virtio_net *dev,
{
uint32_t pkt_idx = 0;
uint32_t remained = count;
+ uint16_t i;
do {
rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
if (remained >= PACKED_BATCH_SIZE) {
- if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+ vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
+ pkts[pkt_idx + i] =
+ rte_pktmbuf_alloc(mbuf_pool);
+ }
+
+ if (!virtio_dev_tx_batch_packed(dev, vq,
&pkts[pkt_idx])) {
pkt_idx += PACKED_BATCH_SIZE;
remained -= PACKED_BATCH_SIZE;
+
continue;
+ } else {
+ vhost_for_each_try_unroll(i, 0,
+ PACKED_BATCH_SIZE) {
+ rte_pktmbuf_free(pkts[pkt_idx + i]);
+ }
}
}
+ pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);
+
if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
- &pkts[pkt_idx]))
+ &pkts[pkt_idx])) {
+ rte_pktmbuf_free(pkts[pkt_idx]);
break;
+ }
pkt_idx++;
remained--;
--
2.30.2
