27c9d80f51
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44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Subject: mvneta: tx queue workaround
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The hardware queue scheduling is apparently configured with fixed
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priorities, which creates a nasty fairness issue where traffic from one
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CPU can starve traffic from all other CPUs.
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Work around this issue by forcing all tx packets to go through one CPU,
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until this issue is fixed properly.
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Ref: https://github.com/openwrt/openwrt/issues/5411
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/ethernet/marvell/mvneta.c
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+++ b/drivers/net/ethernet/marvell/mvneta.c
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@@ -5294,6 +5294,16 @@ static int mvneta_setup_tc(struct net_de
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}
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}
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+#ifndef CONFIG_ARM64
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+static u16 mvneta_select_queue(struct net_device *dev, struct sk_buff *skb,
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+ struct net_device *sb_dev)
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+{
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+ /* XXX: hardware queue scheduling is broken,
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+ * use only one queue until it is fixed */
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+ return 0;
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+}
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+#endif
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+
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static const struct net_device_ops mvneta_netdev_ops = {
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.ndo_open = mvneta_open,
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.ndo_stop = mvneta_stop,
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@@ -5304,6 +5314,9 @@ static const struct net_device_ops mvnet
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.ndo_fix_features = mvneta_fix_features,
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.ndo_get_stats64 = mvneta_get_stats64,
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.ndo_eth_ioctl = mvneta_ioctl,
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+#ifndef CONFIG_ARM64
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+ .ndo_select_queue = mvneta_select_queue,
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+#endif
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.ndo_bpf = mvneta_xdp,
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.ndo_xdp_xmit = mvneta_xdp_xmit,
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.ndo_setup_tc = mvneta_setup_tc,
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