[dpdk-dev] [PATCH 2/2] virtio: don't claim to support LRO

[Stephen Hemminger]

The current virtio supports Transmit Segmentation Offload, but
does not really support Large Receive Offload. The driver was confusing
the two offloads.

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/net/virtio/virtio_ethdev.c | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index ca607904fa37..00a3122780ba 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1659,11 +1659,8 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 {
 	const struct rte_eth_rxmode *rxmode = &dev->data->dev_conf.rxmode;
 	struct virtio_hw *hw = dev->data->dev_private;
-	uint64_t req_features;
-	int ret;
 
 	PMD_INIT_LOG(DEBUG, "configure");
-	req_features = VIRTIO_PMD_DEFAULT_GUEST_FEATURES;
 
 	/* Virtio does L4 checksum but not L3! */
 	if (rxmode->hw_ip_checksum) {
@@ -1671,23 +1668,10 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 			    "virtio does not support IP checksum");
 		return -ENOTSUP;
 	}
-	if (rxmode->enable_lro)
-		req_features |=
-			(1ULL << VIRTIO_NET_F_GUEST_TSO4) |
-			(1ULL << VIRTIO_NET_F_GUEST_TSO6);
-
-	/* if request features changed, reinit the device */
-	if (req_features != hw->req_guest_features) {
-		ret = virtio_init_device(dev, req_features);
-		if (ret < 0)
-			return ret;
-	}
 
-	if (rxmode->enable_lro &&
-		(!vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
-			!vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4))) {
+	if (rxmode->enable_lro) {
 		PMD_DRV_LOG(NOTICE,
-			"lro not available on this host");
+			    "virtio does not support Large Receive Offload");
 		return -ENOTSUP;
 	}
 
@@ -1913,8 +1897,6 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 	}
 	tso_mask = (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
 		(1ULL << VIRTIO_NET_F_GUEST_TSO6);
-	if ((host_features & tso_mask) == tso_mask)
-		dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_TCP_LRO;
 
 	dev_info->tx_offload_capa = 0;
 	if (hw->guest_features & (1ULL << VIRTIO_NET_F_CSUM)) {
-- 
2.11.0