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@@ -0,0 +1,29 @@
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+From: Felix Fietkau <[email protected]>
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+Date: Fri, 6 May 2022 21:38:42 +0200
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+Subject: [PATCH] net: dsa: tag_mtk: add padding for tx packets
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+
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+Padding for transmitted packets needs to account for the special tag.
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+With not enough padding, garbage bytes are inserted by the switch at the
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+end of small packets.
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+
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+Fixes: 5cd8985a1909 ("net-next: dsa: add Mediatek tag RX/TX handler")
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+Signed-off-by: Felix Fietkau <[email protected]>
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+---
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+
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+--- a/net/dsa/tag_mtk.c
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++++ b/net/dsa/tag_mtk.c
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+@@ -25,6 +25,14 @@ static struct sk_buff *mtk_tag_xmit(stru
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+ u8 xmit_tpid;
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+ u8 *mtk_tag;
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+
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++ /* The Ethernet switch we are interfaced with needs packets to be at
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++ * least 64 bytes (including FCS) otherwise their padding might be
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++ * corrupted. With tags enabled, we need to make sure that packets are
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++ * at least 68 bytes (including FCS and tag).
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++ */
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++ if (__skb_put_padto(skb, ETH_ZLEN + MTK_HDR_LEN, false))
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++ return NULL;
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++
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+ /* Build the special tag after the MAC Source Address. If VLAN header
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+ * is present, it's required that VLAN header and special tag is
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+ * being combined. Only in this way we can allow the switch can parse
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Felix Fietkau