** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Yakkety)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1655420
Title:
Ubuntu - ibmveth: abnormally large TCP MSS value caused a TCP session
to hang with a zero window
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Committed
Status in linux source package in Yakkety:
Fix Committed
Status in linux source package in Zesty:
Fix Released
Bug description:
== Comment: #0 - THOMAS L. FALCON - 2017-01-10 11:54:24 ==
This bug is being mirrored for any distributions that include ibmveth
large send/receive support. In short, any distribution with ibmveth
v1.05 will be affected (releases 14.04.5/Wily+)
2 upstream commits:
1. Set GSO size and type
https://github.com/torvalds/linux/commit/7b5967389f5a8dfb9d32843830f5e2717e20995d
2. set GSO segments
https://github.com/torvalds/linux/commit/94acf164dc8f1184e8d0737be7125134c2701dbe
A VIOS fix is needed as well.
---Problem Description---
When ibmveth interface on a PowerVM logical partition received a large,
aggregated packet from firmware, the gso fields in the socket buffer shared
info were not filled in correctly. This surfaced in a bug where the TCP rx
window calculation algorithm returned a Zero Window even when there was
available space.
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