Initial commit

target/linux/mvebu/patches-6.6/700-mvneta-tx-queue-workaround.patch

@@ -0,0 +1,43 @@
+From: Felix Fietkau <nbd@nbd.name>
+Subject: mvneta: tx queue workaround
+
+The hardware queue scheduling is apparently configured with fixed
+priorities, which creates a nasty fairness issue where traffic from one
+CPU can starve traffic from all other CPUs.
+
+Work around this issue by forcing all tx packets to go through one CPU,
+until this issue is fixed properly.
+
+Ref: https://github.com/openwrt/openwrt/issues/5411
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -5294,6 +5294,16 @@ static int mvneta_setup_tc(struct net_de
+ 	}
+ }
+ 
++#ifndef CONFIG_ARM64
++static u16 mvneta_select_queue(struct net_device *dev, struct sk_buff *skb,
++			       struct net_device *sb_dev)
++{
++	/* XXX: hardware queue scheduling is broken,
++	 * use only one queue until it is fixed */
++	return 0;
++}
++#endif
++
+ static const struct net_device_ops mvneta_netdev_ops = {
+ 	.ndo_open            = mvneta_open,
+ 	.ndo_stop            = mvneta_stop,
+@@ -5304,6 +5314,9 @@ static const struct net_device_ops mvnet
+ 	.ndo_fix_features    = mvneta_fix_features,
+ 	.ndo_get_stats64     = mvneta_get_stats64,
+ 	.ndo_eth_ioctl        = mvneta_ioctl,
++#ifndef CONFIG_ARM64
++	.ndo_select_queue    = mvneta_select_queue,
++#endif
+ 	.ndo_bpf	     = mvneta_xdp,
+ 	.ndo_xdp_xmit        = mvneta_xdp_xmit,
+ 	.ndo_setup_tc	     = mvneta_setup_tc,