OpenWrt/LEDE Project

  • Status Closed
  • Percent Complete
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Jan Hoffmann - 23.08.2021
Last edited by Ted Hess - 20.10.2021

FS#3990 - lantiq: gswip: packets larger than 1496 bytes dropped when VLAN is used

This issue occurs with current master on a Fritzbox 7412 and 7362 SL.

When a switch port is using tagged VLAN, any packets sent from the device which are larger than 1496 bytes are dropped. Incoming packets are received correctly.

Comparison of the old swconfig driver with the new DSA driver shows that a lower value is now written to the GSWIP_MAC_FLEN register. Now it is 1526 (VLAN_ETH_FRAME_LEN + 8), while it was 1534 before (1518 + 8 + 4 * 2, which corresponds to “MAC frame + 8-byte special tag + 4-byte VLAN tag * 2” according to comments in the vendor driver). Increasing this to the old value seems to fix the issue.

Closed by  Ted Hess
20.10.2021 11:17
Reason for closing:  Fixed


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