Implement support for receiving merged buffers in virtio when packed
virtqueues are enabled.
Signed-off-by: Jens Freimann <jfreim...@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 4 --
drivers/net/virtio/virtio_rxtx.c | 103 +++++++++++++++++++++++++++--
drivers/net/virtio/virtqueue.h | 1 +
3 files changed, 98 insertions(+), 10 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c
b/drivers/net/virtio/virtio_ethdev.c
index b02c65598..f2e515838 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1331,10 +1331,6 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
{
struct virtio_hw *hw = eth_dev->data->dev_private;
- /*
- * workarount for packed vqs which don't support
- * mrg_rxbuf at this point
- */
if (vtpci_packed_queue(hw)) {
eth_dev->rx_pkt_burst = &virtio_recv_pkts_packed;
} else if (hw->use_simple_rx) {
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 3f5fa7366..577786b7e 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -195,6 +195,79 @@ vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
dp->next = VQ_RING_DESC_CHAIN_END;
}
+static void
+virtio_refill_packed(struct virtqueue *vq, uint16_t used_idx,
+ struct virtnet_rx *rxvq)
+{
+ struct vq_desc_extra *dxp;
+ struct vring_desc_packed *descs = vq->vq_ring.desc_packed;
+ struct vring_desc_packed *desc;
+ struct rte_mbuf *nmb;
+
+ nmb = rte_mbuf_raw_alloc(rxvq->mpool);
+ if (unlikely(nmb == NULL)) {
+ struct rte_eth_dev *dev
+ = &rte_eth_devices[rxvq->port_id];
+ dev->data->rx_mbuf_alloc_failed++;
+ return;
+ }
+
+ desc = &descs[used_idx];
+
+ dxp = &vq->vq_descx[used_idx];
+
+ dxp->cookie = nmb;
+ dxp->ndescs = 1;
+
+ desc->addr = VIRTIO_MBUF_ADDR(nmb, vq) +
+ RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size;
+ desc->len = nmb->buf_len - RTE_PKTMBUF_HEADROOM +
+ vq->hw->vtnet_hdr_size;
+ desc->flags |= VRING_DESC_F_WRITE;
+}
+
+static uint16_t
+virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
+ struct rte_mbuf **rx_pkts,
+ uint32_t *len,
+ uint16_t num,
+ struct virtnet_rx *rx_queue)
+{
+ struct rte_mbuf *cookie;
+ uint16_t used_idx;
+ struct vring_desc_packed *desc;
+ uint16_t i;
+
+ for (i = 0; i < num; i++) {
+ used_idx = vq->vq_used_cons_idx;
+ desc = &vq->vq_ring.desc_packed[used_idx];
+ if (!desc_is_used(desc, &vq->vq_ring))
+ return i;
+ len[i] = desc->len;
+ cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
+
+ if (unlikely(cookie == NULL)) {
+ PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie
at %u",
+ vq->vq_used_cons_idx);
+ break;
+ }
+ rte_prefetch0(cookie);
+ rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
+ rx_pkts[i] = cookie;
+
+ virtio_refill_packed(vq, used_idx, rx_queue);
+
+ rte_smp_wmb();
+ if (vq->vq_used_cons_idx == 0)
+ vq->vq_ring.used_wrap_counter ^= 1;
+ set_desc_avail(&vq->vq_ring, desc);
+ vq->vq_used_cons_idx = increment_pq_index(vq->vq_used_cons_idx,
+ vq->vq_nentries);
+ }
+
+ return i;
+}
+
static uint16_t
virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
uint32_t *len, uint16_t num)
@@ -1436,12 +1509,16 @@ virtio_recv_mergeable_pkts(void *rx_queue,
uint16_t extra_idx;
uint32_t seg_res;
uint32_t hdr_size;
+ uint32_t rx_num = 0;
nb_rx = 0;
if (unlikely(hw->started == 0))
return nb_rx;
- nb_used = VIRTQUEUE_NUSED(vq);
+ if (vtpci_packed_queue(vq->hw))
+ nb_used = VIRTIO_MBUF_BURST_SZ;
+ else
+ nb_used = VIRTQUEUE_NUSED(vq);
virtio_rmb();
@@ -1454,13 +1531,21 @@ virtio_recv_mergeable_pkts(void *rx_queue,
seg_res = 0;
hdr_size = hw->vtnet_hdr_size;
+ vq->vq_used_idx = vq->vq_used_cons_idx;
+
while (i < nb_used) {
struct virtio_net_hdr_mrg_rxbuf *header;
if (nb_rx == nb_pkts)
break;
- num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
+ if (vtpci_packed_queue(vq->hw))
+ num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
+ len, 1, (struct virtnet_rx *)rx_queue);
+ else
+ num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
+ if (num == 0)
+ return nb_rx;
if (num != 1)
continue;
@@ -1513,9 +1598,13 @@ virtio_recv_mergeable_pkts(void *rx_queue,
uint16_t rcv_cnt =
RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
- uint32_t rx_num =
- virtqueue_dequeue_burst_rx(vq,
- rcv_pkts, len, rcv_cnt);
+ if (vtpci_packed_queue(vq->hw))
+ rx_num =
virtqueue_dequeue_burst_rx_packed(vq,
+ rcv_pkts, len, rcv_cnt,
+ (struct virtnet_rx
*)rx_queue);
+ else
+ rx_num = virtqueue_dequeue_burst_rx(vq,
+ rcv_pkts, len, rcv_cnt);
i += rx_num;
rcv_cnt = rx_num;
} else {
@@ -1559,6 +1648,9 @@ virtio_recv_mergeable_pkts(void *rx_queue,
rxvq->stats.packets += nb_rx;
+ if (vtpci_packed_queue(vq->hw))
+ return nb_rx;
+
/* Allocate new mbuf for the used descriptor */
while (likely(!virtqueue_full(vq))) {
new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
@@ -1578,7 +1670,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
if (likely(nb_enqueued)) {
vq_update_avail_idx(vq);
-
if (unlikely(virtqueue_kick_prepare(vq))) {
virtqueue_notify(vq);
PMD_RX_LOG(DEBUG, "Notified");
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 531ba8c65..735066486 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -171,6 +171,7 @@ struct virtqueue {
* trails vq_ring.used->idx.
*/
uint16_t vq_used_cons_idx;
+ uint16_t vq_used_idx;
uint16_t vq_nentries; /**< vring desc numbers */
uint16_t vq_free_cnt; /**< num of desc available */
uint16_t vq_avail_idx; /**< sync until needed */
--
2.17.1
