[dpdk-stable] patch 'net/virtio: revert not claiming LRO support' has been queued to stable release 17.08.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.08.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/24/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 74a7ac7e7037928d40242f541be4aa3938f5ad42 Mon Sep 17 00:00:00 2001
From: Olivier Matz <olivier.matz at 6wind.com>
Date: Thu, 7 Sep 2017 14:13:38 +0200
Subject: [PATCH] net/virtio: revert not claiming LRO support

[ upstream commit ec9f3d122a58934a2c52ae984be7114d03234a11 ]

This reverts
commit 701a64622c26 ("net/virtio: do not claim to support LRO")

Setting rxmode->enable_lro is a way to tell the host that the guest is
ok to receive tso packets. From the guest point of view, it is like
enabling LRO on a physical driver.

Fixes: 701a64622c26 ("net/virtio: do not claim to support LRO")

Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
Acked-by: Yuanhan Liu <yliu at fridaylinux.org>
---
 drivers/net/virtio/virtio_ethdev.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index e320811..eb2d95a 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1659,9 +1659,11 @@ 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;
 
 	if (dev->data->dev_conf.intr_conf.rxq) {
 		ret = virtio_init_device(dev, hw->req_guest_features);
@@ -1675,10 +1677,23 @@ 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 (rxmode->enable_lro) {
+	/* 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))) {
 		PMD_DRV_LOG(NOTICE,
-			    "virtio does not support Large Receive Offload");
+			"Large Receive Offload not available on this host");
 		return -ENOTSUP;
 	}
 
@@ -1904,6 +1919,8 @@ 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)) {
-- 
2.7.4