Hardware should not aggregate any packets when generic XDP is installed.
Cc: Ariel Elior <ariel.el...@cavium.com>
Cc: everest-linux...@cavium.com
Signed-off-by: Michael Chan <michael.c...@broadcom.com>
---
net/core/dev.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index 6ebd0e7..ec08ace 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1542,6 +1542,29 @@ void dev_disable_lro(struct net_device *dev)
}
EXPORT_SYMBOL(dev_disable_lro);
+/**
+ * dev_disable_gro_hw - disable HW Generic Receive Offload on a device
+ * @dev: device
+ *
+ * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be
+ * called under RTNL. This is needed if Generic XDP is installed on
+ * the device.
+ */
+static void dev_disable_gro_hw(struct net_device *dev)
+{
+ struct net_device *lower_dev;
+ struct list_head *iter;
+
+ dev->wanted_features &= ~NETIF_F_GRO_HW;
+ netdev_update_features(dev);
+
+ if (unlikely(dev->features & NETIF_F_GRO_HW))
+ netdev_WARN(dev, "failed to disable GRO_HW!\n");
+
+ netdev_for_each_lower_dev(dev, lower_dev, iter)
+ dev_disable_gro_hw(lower_dev);
+}
+
static int call_netdevice_notifier(struct notifier_block *nb, unsigned long
val,
struct net_device *dev)
{
@@ -4564,6 +4587,7 @@ static int generic_xdp_install(struct net_device *dev,
struct netdev_bpf *xdp)
} else if (new && !old) {
static_key_slow_inc(&generic_xdp_needed);
dev_disable_lro(dev);
+ dev_disable_gro_hw(dev);
}
break;
--
1.8.3.1
