[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

** No longer affects: linux (Ubuntu Xenial)

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Changed in: ubuntu-power-systems
   Status: Fix Committed => Fix Released

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Changed in: ubuntu-power-systems
   Status: In Progress => Fix Committed

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Tags removed: triage-a
** Tags added: triage-g

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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Re: [Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Daniel Axtens]

Hi Frank,

Yes, that is how I see it - these changes can go through, but we need
good docs to point people to as there is an incredibly high likelihood
of misconfiguration at various points.

Regards,
Daniel

On Tue, Dec 19, 2017 at 3:46 AM, Frank Heimes
<1692...@bugs.launchpad.net> wrote:
> Siva and Daniel, may I just ask where we are on this?
> Well it looks to me that Siva/IBM sees this more as a miss-configuration, so 
> that the changes in comment #18 are _not_ needed. Daniel, do you see it now 
> the same way?
> But in this case this needs to be documented somewhere, so that we can point 
> customers, too it - right?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1692538
>
> Title:
>   Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA
>
> Status in The Ubuntu-power-systems project:
>   In Progress
> Status in linux package in Ubuntu:
>   Fix Released
> Status in linux source package in Xenial:
>   In Progress
> Status in linux source package in Zesty:
>   Fix Released
> Status in linux source package in Artful:
>   Fix Released
>
> Bug description:
>
>   == 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  - 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/b...@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/
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu-power-systems/+bug/1692538/+subscriptions

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Frank Heimes]

Siva and Daniel, may I just ask where we are on this?
Well it looks to me that Siva/IBM sees this more as a miss-configuration, so 
that the changes in comment #18 are _not_ needed. Daniel, do you see it now the 
same way?
But in this case this needs to be documented somewhere, so that we can point 
customers, too it - right?

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Andrew Cloke]

** Tags removed: triage-g
** Tags added: triage-a

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Daniel Axtens]

Hi Siva,

Thank you for your quick and thoughtful response.

I will ask about the default MTU for the veth interface to see if the
user increased it themselves.

I'm not sure I completely understand what you mean about largesend
offload being disabled after retransmits. I'm also not completely sure
if it's largesend offload or just large packets that are causing issues.
If I have understood correctly (e.g.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/com.ibm.aix.performance/tcp_large_send_offload.htm)
large-send offload is what Linux would call TCP Segmentation Offload
(TSO) - does that match your understanding?

Here's my concern. The code I'm looking at (let's look at Zesty, so
v4.10) is in ibmveth.c, ibmveth_poll(). There we see:

 if (length > netdev->mtu + ETH_HLEN) {
ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
adapter->rx_large_packets++;
 }

Then ibmveth_rx_mss_helper() has the following - setting GSO on
regardless of the large_pkt bit:

 /* if mss is not set through Large Packet bit/mss in rx buffer,
  * expect that the mss will be written to the tcp header checksum.
  */
 tcph = (struct tcphdr *)(skb->data + offset);
 if (lrg_pkt) {
skb_shinfo(skb)->gso_size = mss;
 } else if (offset) {
skb_shinfo(skb)->gso_size = ntohs(tcph->check);
tcph->check = 0;
 }

It looks to me that Linux will interpret a packet from the veth adaptor
as a GSO/GRO packet based only on whether or not the size of the
received packet is greater than the linux-side MTU plus the header size
- not based on whether AIX thinks it is transmitting a LSO packet.

To put it another way - if I have understood correctly - there are two
ways we could end up with a GSO/GRO packet coming out of a veth adaptor.
The ibmveth_rx_mss_helper path is taken when the size of the packet is
greater than MTU+ETH_HLEN, which can happen when:

 1) The AIX end has turned on LSO, so the large_packet bit is set
 2) Large-send is off in AIX but there is a mis-matched MTU between AIX and 
Linux

In the first case case, you say that AIX will turn off largesend, which
will fix the issue. But in the second case, if I have understood
correctly, AIX will not be able to do anything. Unless you are saying
that AIX will dynamically reduce the MTU for a connection in the
presence of a number of re-transmits?

This isn't necessarily wrong behaviour from AIX - Linux can't do
anything in this situation either; a 'hop' that can participate in Path
MTU Discovery would be needed.

If I understand it, then, the optimal configuration would be for the AIX
LPAR to set an MTU of 1500/9000 and turn on LSO for veth on the AIX side
- does that sound right?

Thanks again!
Regards,
Daniel

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Daniel Axtens]

Hi Bryant,

So, to be crystal clear, IBM's position is if customers are using this
setup, that they should set the MTU in their AIX partitions to 1500? (or
9000 if using jumbo frames)

Is this documented anywhere on your website that we can point users to?

I ask because I have asked one of your customers/our users to do this in
a support context and they were unhappy about the performance impact. So
if this is the official line, can we have some official documentation of
it?

Regards,
Daniel

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Title:
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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Daniel Axtens]

Just as an update: I am working with Jay V on a set of patches to drop
the oversized packets at the openvswitch/bridge level to prevent the
crash I mentioned.

But that is not sufficient to solve the underlying problem: there will
still be packet loss when there's an MTU mismatch here. A device in AIX
with a 64k MTU being bridged (via openvswitch or a native bridge) to a
device with a 1500 or 9000 byte MTU is never going to work reliably and
efficiently, and IBM will need to figure out how they want to solve
this.

Regards,
Daniel

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

Our support team has encountered a case where ibmveth + openvswitch + bnx2x has
lead to some issues, which IBM should probably be aware of before
turning on large segments in more places.

Here's a summary from support for that issue:

==

[Issue: we see a firmware assertion from an IBM branded bnx2x card.
Decoding the dump with the help of upstream shows that the assert is
caused by a packet with GSO on and gso_size > ~9700 bytes being passed
to the card. We traced the packets through the system, and came up
with this root cause. The system uses ibmveth to talk to AIX LPARs, a
bnx2x network card to talk to the world, and Open vSwitch to tie them
together. There is no VIOS involvement - the card is attached to the
Linux partition.]

The packets causing the issue come through the ibmveth interface -
from the AIX LPAR. The veth protocol is 'special' - communication
between LPARs on the same chassis can use very large (64k) frames to
reduce overhead. Normal networks cannot handle such large packets, so
traditionally, the VIOS partition would signal to the AIX partitions
that it was 'special', and AIX would send regular, ethernet-sized
packets to VIOS, which VIOS would then send out.

This signalling between VIOS and AIX is done in a way that is not
standards-compliant, and so was never made part of Linux. Instead, the
Linux driver has always understood large frames and passed them up the
network stack.

In some cases (e.g. with TCP), multiple TCP segments are coalesced
into one large packet. In Linux, this goes through the generic receive
offload code, using a similar mechanism to GSO. These segments can be
very large which presents as a very large MSS (maximum segment size)
or gso_size.

Normally, the large packet is simply passed to whatever network
application on Linux is going to consume it, and everything is OK.

However, in this case, the packets go through Open vSwitch, and are
then passed to the bnx2x driver. The bnx2x driver/hardware supports
TSO and GSO, but with a restriction: the maximum segment size is
limited to around 9700 bytes. Normally this is more than adequate as
jumbo frames are limited to 9000 bytes. However, if a large packet
with large (>9700 byte) TCP segments arrives through ibmveth, and is
passed to bnx2x, the hardware will panic.

Turning off TSO prevents the crash as the kernel resegments the data
and assembles the packets in software. This has a performance cost.

Clearly at the very least, bnx2x should not crash in this case, and I
am working towards a patch for that.

However, this still leaves us with some issues. The only thing the
bnx2x driver can sensibly do is drop the packet, which will prevent
the crash. However, there will still be issues with large packets:
when they are dropped, the other side will eventually realise that the
data is missing and ask for a retransmit, but the retransmit might
also be too big - there's no way of signalling back to the AIX LPAR
that it should reduce the MSS. Even if the data eventually gets
through there will be a latency/throughput/performance hit.

==

Seeing as IBM seems to be in active development in this area - indeed
this code explicitly deals with ibmveth + ovs, could some one from IBM review 
this?

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

Needs testing for Xenial.

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Andrew Cloke]

** Changed in: ubuntu-power-systems
   Status: Fix Committed => In Progress

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Title:
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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Changed in: ubuntu-power-systems
   Status: Confirmed => In Progress

** Changed in: ubuntu-power-systems
   Status: In Progress => Fix Committed

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[bugproxy]

** Tags removed: targetmilestone-inin16042
** Tags added: targetmilestone-inin16043

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Title:
  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.10.0-33.37

---
linux (4.10.0-33.37) zesty; urgency=low

  * linux: 4.10.0-33.37 -proposed tracker (LP: #1709303)

  * CVE-2017-1000112
- Revert "udp: consistently apply ufo or fragmentation"
- udp: consistently apply ufo or fragmentation

  * CVE-2017-1000111
- Revert "net-packet: fix race in packet_set_ring on PACKET_RESERVE"
- packet: fix tp_reserve race in packet_set_ring

  * ThunderX: soft lockup on 4.8+ kernels when running qemu-efi with vhost=on
(LP: #1673564)
- irqchip/gic-v3: Add missing system register definitions
- arm64: KVM: Do not use stack-protector to compile EL2 code
- KVM: arm/arm64: vgic-v3: Use PREbits to infer the number of ICH_APxRn_EL2
  registers
- KVM: arm/arm64: vgic-v3: Fix nr_pre_bits bitfield extraction
- arm64: Add a facility to turn an ESR syndrome into a sysreg encoding
- KVM: arm/arm64: vgic-v3: Add accessors for the ICH_APxRn_EL2 registers
- KVM: arm64: Make kvm_condition_valid32() accessible from EL2
- KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2
- KVM: arm64: vgic-v3: Add ICV_BPR1_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_IGRPEN1_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_IAR1_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_EOIR1_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_AP1Rn_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler
- KVM: arm64: vgic-v3: Enable trapping of Group-1 system registers
- KVM: arm64: Enable GICv3 Group-1 sysreg trapping via command-line
- KVM: arm64: vgic-v3: Add ICV_BPR0_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_IGNREN0_EL1 handler
- KVM: arm64: vgic-v3: Add misc Group-0 handlers
- KVM: arm64: vgic-v3: Enable trapping of Group-0 system registers
- KVM: arm64: Enable GICv3 Group-0 sysreg trapping via command-line
- arm64: Add MIDR values for Cavium cn83XX SoCs
- [Config] CONFIG_CAVIUM_ERRATUM_30115=y
- arm64: Add workaround for Cavium Thunder erratum 30115
- KVM: arm64: vgic-v3: Add ICV_DIR_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_RPR_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_CTLR_EL1 handler
- KVM: arm64: vgic-v3: Add ICV_PMR_EL1 handler
- KVM: arm64: Enable GICv3 common sysreg trapping via command-line
- KVM: arm64: vgic-v3: Log which GICv3 system registers are trapped
- arm64: KVM: Make unexpected reads from WO registers inject an undef
- KVM: arm64: Log an error if trapping a read-from-write-only GICv3 access
- KVM: arm64: Log an error if trapping a write-to-read-only GICv3 access

  * ibmvscsis: Do not send aborted task response (LP: #1689365)
- target: Fix unknown fabric callback queue-full errors
- ibmvscsis: Do not send aborted task response
- ibmvscsis: Clear left-over abort_cmd pointers
- ibmvscsis: Fix the incorrect req_lim_delta

  * hisi_sas performance improvements (LP: #1708734)
- scsi: hisi_sas: define hisi_sas_device.device_id as int
- scsi: hisi_sas: optimise the usage of hisi_hba.lock
- scsi: hisi_sas: relocate sata_done_v2_hw()
- scsi: hisi_sas: optimise DMA slot memory

  * hisi_sas driver reports mistakes timed out task for internal abort
(LP: #1708730)
- scsi: hisi_sas: fix timeout check in hisi_sas_internal_task_abort()

  * scsi: hisi_sas: add null check before indirect pointer dereference
(LP: #1708714)
- scsi: hisi_sas: add null check before indirect pointer dereference

  * [LTCTest][Opal][FW860.20] HMI recoverable errors failed to recover and
system goes to dump state. (LP: #1684054)
- powerpc/64: Fix HMI exception on LE with CONFIG_RELOCATABLE=y

  * Set CONFIG_SATA_HIGHBANK=y on armhf (LP: #1703430)
- [Config] CONFIG_SATA_HIGHBANK=y

  * Adt tests of src:linux time out often on armhf lxc containers (LP: #1705495)
- [Packaging] tests -- reduce rebuild test to one flavour

  * support Hip07/08 I2C controller (LP: #1708293)
- ACPI / APD: Add clock frequency for Hisilicon Hip07/08 I2C controller
- i2c: designware: Add ACPI HID for Hisilicon Hip07/08 I2C controller

  * Mute key LED does not work on HP ProBook 440 (LP: #1705586)
- ALSA: hda - Add HP ZBook 15u G3 Conexant CX20724 GPIO mute leds
- ALSA: hda - Add mute led support for HP ProBook 440 G4

  * Hisilicon D05 onboard fibre NIC link indicator LEDs don't work
(LP: #1704903)
- net: hns: add acpi function of xge led control

  * zesty unable to handle kernel NULL pointer dereference (LP: #1680904)
- drm/i915: Do not drop pagetables when empty

  * hns: use after free in hns_nic_net_xmit_hw (LP: #1704885)
- net: hns: Fix a skb used after free bug

  * [ARM64] config EDAC_GHES=y depends on EDAC_MM_EDAC=y (LP: #1706141)
- [Config] set EDAC_MM_EDAC=y for ARM64

  * [Hyper-V] hv_netvsc: Exclude non-TCP port numbers from vRSS hashing
(LP: #1690174)
- hv_netvsc: Exclude non-TCP port numbers from vRSS hashing

  * 

[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

** Description changed:

+ 
+ == 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  - 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 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 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 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/b...@us.ibm.com 
-  
+  - 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/b...@us.ibm.com
+ 
  ---uname output---
  4.8.0-51.54
-  
- Machine Type = p8 
-  
+ 
+ Machine Type = p8
+ 
  ---Debugger---
  A 

[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[bugproxy]

--- Comment From b...@us.ibm.com 2017-08-24 16:07 EDT---
Works for us.

** Tags added: verification-done-xenial

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

There is now a Xenial test kernel, which has a backport of commit
66aa0678efc2. The test kernels can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1692538/xenial

Can you test these kernels and see if they resolve this bug?

Thanks in advance!

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[bugproxy]

--- Comment From b...@us.ibm.com 2017-08-16 16:14 EDT---
I added the tag: verification-done-zesty

** Tags removed: verification-needed-zesty
** Tags added: verification-done-zesty

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Kleber Sacilotto de Souza]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
zesty' to 'verification-done-zesty'. If the problem still exists, change
the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-zesty

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.12.0-11.12

---
linux (4.12.0-11.12) artful; urgency=low

  * linux: 4.12.0-11.12 -proposed tracker (LP: #1709929)

  * CVE-2017-1000111
- packet: fix tp_reserve race in packet_set_ring

  * CVE-2017-1000112
- udp: consistently apply ufo or fragmentation

  * Please only recommend or suggest initramfs-tools | linux-initramfs-tool for
kernels able to boot without initramfs (LP: #1700972)
- Revert "UBUNTU: [Debian] Don't depend on initramfs-tools"
- [Debian] Don't depend on initramfs-tools

  * Miscellaneous Ubuntu changes
- SAUCE: (noup) Update spl to 0.6.5.11-ubuntu1, zfs to 0.6.5.11-1ubuntu3
- SAUCE: powerpc: Always initialize input array when calling 
epapr_hypercall()

  * Miscellaneous upstream changes
- selftests: typo correction for memory-hotplug test
- selftests: check hot-pluggagble memory for memory-hotplug test
- selftests: check percentage range for memory-hotplug test
- selftests: add missing test name in memory-hotplug test
- selftests: fix memory-hotplug test

 -- Seth Forshee   Thu, 10 Aug 2017 13:37:00
-0500

** Changed in: linux (Ubuntu Artful)
   Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000111

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000112

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Stefan Bader]

** Changed in: linux (Ubuntu Zesty)
   Status: In Progress => Fix Committed

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Seth Forshee]

** Changed in: linux (Ubuntu Artful)
   Status: In Progress => Fix Committed

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Artful)
   Importance: Critical
 Assignee: Canonical Kernel Team (canonical-kernel-team)
   Status: Confirmed

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Zesty)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu Zesty)
   Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
   Status: New => In Progress

** Changed in: linux (Ubuntu Artful)
   Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Artful)
 Assignee: Canonical Kernel Team (canonical-kernel-team) => Joseph 
Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Zesty)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

I had a build failure with Xenial.  There are some prereq commits
required that I am working on identifying now.

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Tags added: triage-g

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Frank Heimes]

** Changed in: ubuntu-power-systems
 Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

I built Xenial, Zesty and Artful test kernels with commit 66aa0678efc2.
The test kernels can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1692538/

Can you test these kernels and see if they resolve this bug?

Thanks in advance!

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Critical

** Changed in: ubuntu-power-systems
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu)
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Canonical Kernel Team (canonical-kernel-team)

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  Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Frank Heimes]

** Changed in: ubuntu-power-systems
   Status: New => Confirmed

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux (Ubuntu)
   Status: New => Confirmed

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Tags added: ubuntu-16.04

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Joseph Salisbury]

** Tags added: kernel-da-key

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[Bug 1692538] Re: Ubuntu 16.04.02: ibmveth: Support to enable LSO/CSO for Trunk VEA

[Manoj Iyer]

** Also affects: ubuntu-power-systems
   Importance: Undecided
   Status: New

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