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| author | Felix Fietkau <nbd@nbd.name> | 2022-05-06 21:54:48 +0200 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2022-05-06 21:55:52 +0200 |
| commit | ae64d0624c30000f0549e418e4d592f09eb63795 (patch) | |
| tree | e587c575950fbae9d59cc37121f16e3ce43a1964 /target/linux | |
| parent | 53fc6e9edeae7364847bd1a7a81a331feeb56172 (diff) | |
| download | upstream-ae64d0624c30000f0549e418e4d592f09eb63795.tar.gz upstream-ae64d0624c30000f0549e418e4d592f09eb63795.tar.bz2 upstream-ae64d0624c30000f0549e418e4d592f09eb63795.zip | |
kernel: fix corrupted padding on small packets with mt753x dsa
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry-picked from commit 203ffc4ca75d43ac32b164c5a474e3ce36999809)
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/generic/pending-5.10/705-net-dsa-tag_mtk-add-padding-for-tx-packets.patch | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.10/705-net-dsa-tag_mtk-add-padding-for-tx-packets.patch b/target/linux/generic/pending-5.10/705-net-dsa-tag_mtk-add-padding-for-tx-packets.patch new file mode 100644 index 0000000000..e27ac3595f --- /dev/null +++ b/target/linux/generic/pending-5.10/705-net-dsa-tag_mtk-add-padding-for-tx-packets.patch @@ -0,0 +1,29 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Fri, 6 May 2022 21:38:42 +0200 +Subject: [PATCH] net: dsa: tag_mtk: add padding for tx packets + +Padding for transmitted packets needs to account for the special tag. +With not enough padding, garbage bytes are inserted by the switch at the +end of small packets. + +Fixes: 5cd8985a1909 ("net-next: dsa: add Mediatek tag RX/TX handler") +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 + u8 xmit_tpid; + u8 *mtk_tag; + ++ /* The Ethernet switch we are interfaced with needs packets to be at ++ * least 64 bytes (including FCS) otherwise their padding might be ++ * 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; ++ + /* Build the special tag after the MAC Source Address. If VLAN header + * is present, it's required that VLAN header and special tag is + * being combined. Only in this way we can allow the switch can parse |