| 2017-05-22 14:19:25 |
bugproxy |
bug |
|
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added bug |
| 2017-05-22 14:19:27 |
bugproxy |
tags |
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architecture-ppc64le bugnameltc-154875 severity-critical targetmilestone-inin16042 |
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| 2017-05-22 14:19:28 |
bugproxy |
ubuntu: assignee |
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Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) |
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| 2017-05-22 14:19:31 |
bugproxy |
affects |
ubuntu |
linux (Ubuntu) |
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| 2017-05-22 15:01:13 |
Manoj Iyer |
bug task added |
|
ubuntu-power-systems |
|
| 2017-05-25 16:11:49 |
Joseph Salisbury |
tags |
architecture-ppc64le bugnameltc-154875 severity-critical targetmilestone-inin16042 |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 |
|
| 2017-06-01 15:40:51 |
Manoj Iyer |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 ubuntu-16.04 |
|
| 2017-06-02 18:11:38 |
Launchpad Janitor |
linux (Ubuntu): status |
New |
Confirmed |
|
| 2017-06-03 17:40:31 |
Frank Heimes |
ubuntu-power-systems: status |
New |
Confirmed |
|
| 2017-07-19 16:21:28 |
Manoj Iyer |
linux (Ubuntu): importance |
Undecided |
Critical |
|
| 2017-07-19 16:21:30 |
Manoj Iyer |
ubuntu-power-systems: importance |
Undecided |
Critical |
|
| 2017-07-19 16:21:43 |
Manoj Iyer |
linux (Ubuntu): assignee |
Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) |
Canonical Kernel Team (canonical-kernel-team) |
|
| 2017-07-21 15:26:08 |
Frank Heimes |
ubuntu-power-systems: assignee |
|
Canonical Kernel Team (canonical-kernel-team) |
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| 2017-07-24 15:55:54 |
Manoj Iyer |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 ubuntu-16.04 |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 |
|
| 2017-07-30 13:57:51 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Xenial |
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| 2017-07-30 13:57:51 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Xenial) |
|
| 2017-07-30 13:57:51 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Artful |
|
| 2017-07-30 13:57:51 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Artful) |
|
| 2017-07-30 13:57:51 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Zesty |
|
| 2017-07-30 13:57:51 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Zesty) |
|
| 2017-07-30 13:58:00 |
Joseph Salisbury |
linux (Ubuntu Zesty): importance |
Undecided |
Critical |
|
| 2017-07-30 13:58:02 |
Joseph Salisbury |
linux (Ubuntu Xenial): importance |
Undecided |
Critical |
|
| 2017-07-30 13:58:06 |
Joseph Salisbury |
linux (Ubuntu Zesty): status |
New |
In Progress |
|
| 2017-07-30 13:58:10 |
Joseph Salisbury |
linux (Ubuntu Xenial): status |
New |
In Progress |
|
| 2017-07-30 13:58:12 |
Joseph Salisbury |
linux (Ubuntu Artful): status |
Confirmed |
In Progress |
|
| 2017-07-30 13:58:15 |
Joseph Salisbury |
linux (Ubuntu Artful): assignee |
Canonical Kernel Team (canonical-kernel-team) |
Joseph Salisbury (jsalisbury) |
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| 2017-07-30 13:58:18 |
Joseph Salisbury |
linux (Ubuntu Zesty): assignee |
|
Joseph Salisbury (jsalisbury) |
|
| 2017-07-30 13:58:21 |
Joseph Salisbury |
linux (Ubuntu Xenial): assignee |
|
Joseph Salisbury (jsalisbury) |
|
| 2017-07-31 15:02:08 |
Seth Forshee |
linux (Ubuntu Artful): status |
In Progress |
Fix Committed |
|
| 2017-08-11 10:42:37 |
Stefan Bader |
linux (Ubuntu Zesty): status |
In Progress |
Fix Committed |
|
| 2017-08-16 07:46:08 |
Launchpad Janitor |
linux (Ubuntu Artful): status |
Fix Committed |
Fix Released |
|
| 2017-08-16 07:46:08 |
Launchpad Janitor |
cve linked |
|
2017-1000111 |
|
| 2017-08-16 07:46:08 |
Launchpad Janitor |
cve linked |
|
2017-1000112 |
|
| 2017-08-16 16:34:54 |
Kleber Sacilotto de Souza |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-needed-zesty |
|
| 2017-08-16 20:19:48 |
bugproxy |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-needed-zesty |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-done-zesty |
|
| 2017-08-24 20:09:25 |
bugproxy |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-done-zesty |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-done-xenial verification-done-zesty |
|
| 2017-08-25 16:22:35 |
Joseph Salisbury |
description |
== Comment: #0 - BRYANT G. LY <bgly@us.ibm.com> - 2017-05-22 08:40:16 ==
---Problem Description---
- Issue 1: ibmveth doesn't support largesend and checksum offload features
when configured as "Trunk". Driver has explicit checks to prevent
enabling these offloads.
- Issue 2: SYN packet drops seen at destination VM. When the packet
originates, it has CHECKSUM_PARTIAL flag set and as it gets delivered to
IO server's inbound Trunk ibmveth, on validating "checksum good" bits
in ibmveth receive routine, SKB's ip_summed field is set with
CHECKSUM_UNNECESSARY flag. This packet is then bridged by OVS (or Linux
Bridge) and delivered to outbound Trunk ibmveth. At this point the
outbound ibmveth transmit routine will not set "no checksum" and
"checksum good" bits in transmit buffer descriptor, as it does so only
when the ip_summed field is CHECKSUM_PARTIAL. When this packet gets
delivered to destination VM, TCP layer receives the packet with checksum
value of 0 and with no checksum related flags in ip_summed field. This
leads to packet drops. So, TCP connections never goes through fine.
- Issue 3: First packet of a TCP connection will be dropped, if there is
no OVS flow cached in datapath. OVS while trying to identify the flow,
computes the checksum. The computed checksum will be invalid at the
receiving end, as ibmveth transmit routine zeroes out the pseudo
checksum value in the packet. This leads to packet drop.
- Issue 4: ibmveth driver doesn't have support for SKB's with frag_list.
When Physical NIC has GRO enabled and when OVS bridges these packets,
OVS vport send code will end up calling dev_queue_xmit, which in turn
calls validate_xmit_skb.
In validate_xmit_skb routine, the larger packets will get segmented into
MSS sized segments, if SKB has a frag_list and if the driver to which
they are delivered to doesn't support NETIF_F_FRAGLIST feature.
Contact Information = Bryant G. Ly/bgly@us.ibm.com
---uname output---
4.8.0-51.54
Machine Type = p8
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Increases performance greatly
The patch has been accepted upstream:
https://patchwork.ozlabs.org/patch/764533/ |
== SRU Justification ==
Commit 66aa0678ef is request to fix four issues with the ibmveth driver.
The issues are as follows:
- Issue 1: ibmveth doesn't support largesend and checksum offload features when configured as "Trunk".
- Issue 2: SYN packet drops seen at destination VM. When the packet
originates, it has CHECKSUM_PARTIAL flag set and as it gets delivered to IO
server's inbound Trunk ibmveth, on validating "checksum good" bits in ibmveth
receive routine, SKB's ip_summed field is set with CHECKSUM_UNNECESSARY flag.
- Issue 3: First packet of a TCP connection will be dropped, if there is
no OVS flow cached in datapath.
- Issue 4: ibmveth driver doesn't have support for SKB's with frag_list.
The details for the fixes to these issues are described in the commits git log.
== Comment: #0 - BRYANT G. LY <bgly@us.ibm.com> - 2017-05-22 08:40:16 ==
---Problem Description---
- Issue 1: ibmveth doesn't support largesend and checksum offload features
when configured as "Trunk". Driver has explicit checks to prevent
enabling these offloads.
- Issue 2: SYN packet drops seen at destination VM. When the packet
originates, it has CHECKSUM_PARTIAL flag set and as it gets delivered to
IO server's inbound Trunk ibmveth, on validating "checksum good" bits
in ibmveth receive routine, SKB's ip_summed field is set with
CHECKSUM_UNNECESSARY flag. This packet is then bridged by OVS (or Linux
Bridge) and delivered to outbound Trunk ibmveth. At this point the
outbound ibmveth transmit routine will not set "no checksum" and
"checksum good" bits in transmit buffer descriptor, as it does so only
when the ip_summed field is CHECKSUM_PARTIAL. When this packet gets
delivered to destination VM, TCP layer receives the packet with checksum
value of 0 and with no checksum related flags in ip_summed field. This
leads to packet drops. So, TCP connections never goes through fine.
- Issue 3: First packet of a TCP connection will be dropped, if there is
no OVS flow cached in datapath. OVS while trying to identify the flow,
computes the checksum. The computed checksum will be invalid at the
receiving end, as ibmveth transmit routine zeroes out the pseudo
checksum value in the packet. This leads to packet drop.
- Issue 4: ibmveth driver doesn't have support for SKB's with frag_list.
When Physical NIC has GRO enabled and when OVS bridges these packets,
OVS vport send code will end up calling dev_queue_xmit, which in turn
calls validate_xmit_skb.
In validate_xmit_skb routine, the larger packets will get segmented into
MSS sized segments, if SKB has a frag_list and if the driver to which
they are delivered to doesn't support NETIF_F_FRAGLIST feature.
Contact Information = Bryant G. Ly/bgly@us.ibm.com
---uname output---
4.8.0-51.54
Machine Type = p8
---Debugger---
A debugger is not configured
---Steps to Reproduce---
Increases performance greatly
The patch has been accepted upstream:
https://patchwork.ozlabs.org/patch/764533/ |
|
| 2017-08-28 10:14:27 |
Launchpad Janitor |
linux (Ubuntu Zesty): status |
Fix Committed |
Fix Released |
|
| 2017-08-28 10:14:27 |
Launchpad Janitor |
cve linked |
|
2017-7487 |
|
| 2017-09-12 22:40:03 |
bugproxy |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16042 triage-g ubuntu-16.04 verification-done-xenial verification-done-zesty |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16043 triage-g ubuntu-16.04 verification-done-xenial verification-done-zesty |
|
| 2017-09-18 14:13:21 |
Manoj Iyer |
ubuntu-power-systems: status |
Confirmed |
In Progress |
|
| 2017-09-18 14:14:28 |
Manoj Iyer |
ubuntu-power-systems: status |
In Progress |
Fix Committed |
|
| 2017-11-06 14:42:10 |
Andrew Cloke |
ubuntu-power-systems: status |
Fix Committed |
In Progress |
|
| 2017-11-17 13:24:38 |
Daniel Axtens |
bug |
|
|
added subscriber Daniel Axtens |
| 2017-11-20 15:25:44 |
Manoj Iyer |
ubuntu-power-systems: status |
In Progress |
Fix Released |
|
| 2017-11-20 15:25:52 |
Manoj Iyer |
ubuntu-power-systems: status |
Fix Released |
In Progress |
|
| 2017-11-21 06:45:28 |
Dominique Poulain |
bug |
|
|
added subscriber Dominique Poulain |
| 2017-12-18 14:50:51 |
Andrew Cloke |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16043 triage-g ubuntu-16.04 verification-done-xenial verification-done-zesty |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16043 triage-a ubuntu-16.04 verification-done-xenial verification-done-zesty |
|
| 2018-01-16 14:46:46 |
Manoj Iyer |
tags |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16043 triage-a ubuntu-16.04 verification-done-xenial verification-done-zesty |
architecture-ppc64le bugnameltc-154875 kernel-da-key severity-critical targetmilestone-inin16043 triage-g ubuntu-16.04 verification-done-xenial verification-done-zesty |
|
| 2018-01-22 14:43:01 |
Manoj Iyer |
ubuntu-power-systems: status |
In Progress |
Fix Committed |
|
| 2018-02-26 14:55:18 |
Manoj Iyer |
ubuntu-power-systems: status |
Fix Committed |
Fix Released |
|
| 2018-10-29 15:30:45 |
Joseph Salisbury |
bug task deleted |
linux (Ubuntu Xenial) |
|
|
