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From: Huawei Xie <huawei.xie@intel.com>
To: dev@dpdk.org
Date: Sun, 25 Oct 2015 23:35:04 +0800
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Subject: [dpdk-dev] [PATCH v5 7/7] virtio: pick simple rx/tx func
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Changes in v4:
Check merge-able feature when select simple rx/tx functions.
simple rx/tx func is chose when merge-able rx is disabled and user specifies single segment and
no offload support.
Signed-off-by: Huawei Xie <huawei.xie@intel.com>
---
drivers/net/virtio/virtio_rxtx.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 947fc46..0f1daf2 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -53,6 +53,7 @@
#include "virtio_logs.h"
#include "virtio_ethdev.h"
+#include "virtio_pci.h"
#include "virtqueue.h"
#include "virtio_rxtx.h"
@@ -62,6 +63,10 @@
#define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
#endif
+
+#define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
+ ETH_TXQ_FLAGS_NOOFFLOADS)
+
static int use_simple_rxtx;
static void
@@ -459,6 +464,7 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
const struct rte_eth_txconf *tx_conf)
{
uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
+ struct virtio_hw *hw = dev->data->dev_private;
struct virtqueue *vq;
uint16_t tx_free_thresh;
int ret;
@@ -471,6 +477,15 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
return -EINVAL;
}
+ /* Use simple rx/tx func if single segment and no offloads */
+ if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
+ !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+ PMD_INIT_LOG(INFO, "Using simple rx/tx path");
+ dev->tx_pkt_burst = virtio_xmit_pkts_simple;
+ dev->rx_pkt_burst = virtio_recv_pkts_vec;
+ use_simple_rxtx = 1;
+ }
+
ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
nb_desc, socket_id, &vq);
if (ret < 0) {
--
1.8.1.4