diff options
Diffstat (limited to 'nixos/modules/kernel-patches/0073-net-dsa-tag_mtk-add-padding-for-tx-packets.patch')
| -rw-r--r-- | nixos/modules/kernel-patches/0073-net-dsa-tag_mtk-add-padding-for-tx-packets.patch | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/nixos/modules/kernel-patches/0073-net-dsa-tag_mtk-add-padding-for-tx-packets.patch b/nixos/modules/kernel-patches/0073-net-dsa-tag_mtk-add-padding-for-tx-packets.patch new file mode 100644 index 0000000..2870bf8 --- /dev/null +++ b/nixos/modules/kernel-patches/0073-net-dsa-tag_mtk-add-padding-for-tx-packets.patch @@ -0,0 +1,37 @@ +From 4347079c0a187cd344ff33497784e57bac30ff46 Mon Sep 17 00:00:00 2001 +From: Felix Fietkau <nbd@nbd.name> +Date: Fri, 6 May 2022 21:38:42 +0200 +Subject: [PATCH 73/96] 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> +--- + net/dsa/tag_mtk.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c +index 415d8ece242a..1d1f9dbd9e93 100644 +--- a/net/dsa/tag_mtk.c ++++ b/net/dsa/tag_mtk.c +@@ -25,6 +25,14 @@ static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb, + 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 +-- +2.37.2 + |