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kernel: fix mtk dsa tag padding

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The padding intended to avoid corrupted non-zero padding payload was
accidentally adding too many padding bytes, tripping up some setups.
Fix this by using eth_skb_pad instead.
Fixes #11942.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9307c27539805de021fb7163f6ad6dc08992331b)
This commit is contained in:
Felix Fietkau 2023-03-02 12:58:16 +01:00
parent cfce8ab388
commit 7b05a8d05d
1 changed files with 2 additions and 3 deletions
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5
target/linux/generic/pending-5.10/705-net-dsa-tag_mtk-add-padding-for-tx-packets.patch
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@ -12,7 +12,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/dsa/tag_mtk.c
+++ b/net/dsa/tag_mtk.c
@@ -25,6 +25,14 @@ static struct sk_buff *mtk_tag_xmit(stru
@@ -25,6 +25,13 @@ static struct sk_buff *mtk_tag_xmit(stru
u8 xmit_tpid;
u8 *mtk_tag;
@ -21,8 +21,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ * corrupted. With tags enabled, we need to make sure that packets are
+ * at least 68 bytes (including FCS and tag).
+ */
+ if (__skb_put_padto(skb, ETH_ZLEN + MTK_HDR_LEN, false))
+ return NULL;
+ eth_skb_pad(skb);
+
/* Build the special tag after the MAC Source Address. If VLAN header
* is present, it's required that VLAN header and special tag is