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27 lines
779 B
Diff
27 lines
779 B
Diff
Subject: NET: skip GRO for otherhost packets
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For network drivers using napi_gro_receive, packets are run through GRO,
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even when the destination MAC address does not match, and they're supposed
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to be delivered to another host behind a different bridge port.
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This can be very expensive, because for drivers without TSO or scatter-
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gather, this can only be undone by copying the skb and checksumming it
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again.
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Fix this by leaving skbs with PACKET_OTHERHOST untouched.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -3967,6 +3967,9 @@ static enum gro_result dev_gro_receive(s
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enum gro_result ret;
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int grow;
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+ if (skb->pkt_type == PACKET_OTHERHOST)
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+ goto normal;
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+
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if (!(skb->dev->features & NETIF_F_GRO))
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goto normal;
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