tree 6876a7264b753c61c335f9a69b659ee944b5e90f
parent 63aab027cce6f133a9861b4347a61fe8445b5dac
author developer <developer@mediatek.com> 1716469197 +0800
committer developer <developer@mediatek.com> 1716533661 +0800

[][HIGH][kernel][mt7988][eth][Fix software padding processing in Ethernet Tx path]

[Description]
Fix software padding processing in Ethernet Tx path.

  It's found that 20bytes(LLC), 28bytes, and 36bytes(PPP LCP Configuration
Ack) packets with additional 4bytes special tag for dsa driver would lead
to switch Tx CRC error, followed by switch output queue stuck issue.
Therefore, Ethernet driver check skb->len <= 40(36bytes PPP LCP + 4bytes
special tag) and conduct software padding.

  Moreover, skb linearization should be checked again after conduct
software padding.

If without this patch, users might encounter problems when establishing
a PPPoE tunnel.

[Release-log]
N/A

Change-Id: Id28fa3870dc9e905207d95634fe5cd692f363761
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/9129634