[dpdk-dev] [PATCH v2 09/10] net/virtio: keep Rx handler whatever the Tx queue config

[Olivier Matz]

Split use_simple_rxtx into use_simple_rx and use_simple_tx,
and ensure that only use_simple_tx is updated when txq flags
forces to use the standard Tx handler.

This change is also useful for next commit (disable simple Rx
path when Rx checksum is requested).

Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
---
 drivers/net/virtio/virtio_ethdev.c      | 19 ++++++++++++-------
 drivers/net/virtio/virtio_pci.h         |  3 ++-
 drivers/net/virtio/virtio_rxtx.c        |  8 ++++----
 drivers/net/virtio/virtio_user_ethdev.c |  3 ++-
 4 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 0a4c677d7..271ebaedf 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1241,7 +1241,7 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
 {
 	struct virtio_hw *hw = eth_dev->data->dev_private;
 
-	if (hw->use_simple_rxtx) {
+	if (hw->use_simple_rx) {
 		PMD_INIT_LOG(INFO, "virtio: using simple Rx path on port %u",
 			eth_dev->data->port_id);
 		eth_dev->rx_pkt_burst = virtio_recv_pkts_vec;
@@ -1256,7 +1256,7 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
 		eth_dev->rx_pkt_burst = &virtio_recv_pkts;
 	}
 
-	if (hw->use_simple_rxtx) {
+	if (hw->use_simple_tx) {
 		PMD_INIT_LOG(INFO, "virtio: using simple Tx path on port %u",
 			eth_dev->data->port_id);
 		eth_dev->tx_pkt_burst = virtio_xmit_pkts_simple;
@@ -1741,14 +1741,19 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 			return -EBUSY;
 		}
 
-	hw->use_simple_rxtx = 1;
+	hw->use_simple_rx = 1;
+	hw->use_simple_tx = 1;
 
 #if defined RTE_ARCH_ARM64 || defined CONFIG_RTE_ARCH_ARM
-	if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
-		hw->use_simple_rxtx = 0;
+	if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON)) {
+		hw->use_simple_rx = 0;
+		hw->use_simple_tx = 0;
+	}
 #endif
-	if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF))
-		hw->use_simple_rxtx = 0;
+	if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
+		hw->use_simple_rx = 0;
+		hw->use_simple_tx = 0;
+	}
 
 	return 0;
 }
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 18caebdd7..2ff526c88 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -259,7 +259,8 @@ struct virtio_hw {
 	uint8_t	    vlan_strip;
 	uint8_t	    use_msix;
 	uint8_t     modern;
-	uint8_t     use_simple_rxtx;
+	uint8_t     use_simple_rx;
+	uint8_t     use_simple_tx;
 	uint8_t     port_id;
 	uint8_t     mac_addr[ETHER_ADDR_LEN];
 	uint32_t    notify_off_multiplier;
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index ef75ff5bd..45a9c919a 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -456,7 +456,7 @@ virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 	/* Allocate blank mbufs for the each rx descriptor */
 	nbufs = 0;
 
-	if (hw->use_simple_rxtx) {
+	if (hw->use_simple_rx) {
 		for (desc_idx = 0; desc_idx < vq->vq_nentries;
 		     desc_idx++) {
 			vq->vq_ring.avail->ring[desc_idx] = desc_idx;
@@ -478,7 +478,7 @@ virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 			break;
 
 		/* Enqueue allocated buffers */
-		if (hw->use_simple_rxtx)
+		if (hw->use_simple_rx)
 			error = virtqueue_enqueue_recv_refill_simple(vq, m);
 		else
 			error = virtqueue_enqueue_recv_refill(vq, m);
@@ -525,7 +525,7 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	/* cannot use simple rxtx funcs with multisegs or offloads */
 	if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) != VIRTIO_SIMPLE_FLAGS)
-		hw->use_simple_rxtx = 0;
+		hw->use_simple_tx = 0;
 
 	if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 		nb_desc = vq->vq_nentries;
@@ -567,7 +567,7 @@ virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
 
 	PMD_INIT_FUNC_TRACE();
 
-	if (hw->use_simple_rxtx) {
+	if (hw->use_simple_tx) {
 		for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
 			vq->vq_ring.avail->ring[desc_idx] =
 				desc_idx + mid_idx;
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index c96144434..57c964d6d 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -369,7 +369,8 @@ virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
 	 */
 	hw->use_msix = 1;
 	hw->modern   = 0;
-	hw->use_simple_rxtx = 0;
+	hw->use_simple_rx = 0;
+	hw->use_simple_tx = 0;
 	hw->virtio_user_dev = dev;
 	data->dev_flags = RTE_ETH_DEV_DETACHABLE;
 	return eth_dev;
-- 
2.11.0