From: Vlad Yasevich <vyasevic@redhat.com>
To: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>,
"Skidmore, Donald C" <donald.c.skidmore@intel.com>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>
Cc: "Alexander Duyck" <alexander.duyck@gmail.com>,
"Bjørn Mork" <bjorn@mork.no>,
"e1000-devel@lists.sourceforge.net"
<e1000-devel@lists.sourceforge.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"Choi, Sy Jong" <sy.jong.choi@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David Laight" <David.Laight@ACULAB.COM>,
"Hayato Momma" <h-momma@ce.jp.nec.com>
Subject: Re: [E1000-devel] [PATCH 1/3] ixgbe, ixgbevf: Add new mbox API to enable MC promiscuous mode
Date: Tue, 17 Feb 2015 10:02:50 -0500 [thread overview]
Message-ID: <54E3581A.70900@redhat.com> (raw)
In-Reply-To: <7F861DC0615E0C47A872E6F3C5FCDDBD05E322FD@BPXM14GP.gisp.nec.co.jp>
On 02/15/2015 11:54 PM, Hiroshi Shimamoto wrote:
>>>>>>>>>>> Can you please fix up your patches based on my tree:
>>>>>>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/que
>>>>>>>>>>> ue.git
>>>>>>>>>>
>>>>>>>>>> Yes. I haven't noticed your tree.
>>>>>>>>>> Will resend patches against it.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I encountered an issue with your tree, the commit id is below.
>>>>>>>>>
>>>>>>>>> $ git log | head
>>>>>>>>> commit e6f1649780f8f5a87299bf6af04453f93d1e3d5e
>>>>>>>>> Author: Rasmus Villemoes <linux@rasmusvillemoes.dk>
>>>>>>>>> Date: Fri Jan 23 20:43:14 2015 -0800
>>>>>>>>>
>>>>>>>>> ethernet: fm10k: Actually drop 4 bits
>>>>>>>>>
>>>>>>>>> The comment explains the intention, but vid has type u16. Before
>>>> the
>>>>>>>>> inner shift, it is promoted to int, which has plenty of space for all
>>>>>>>>> vid's bits, so nothing is dropped. Use a simple mask instead.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I use the kernel from your tree in both host and guest.
>>>>>>>>>
>>>>>>>>> Assign an IPv6 for VF in guest.
>>>>>>>>> # ip -6 addr add 2001:db8::18:1/64 dev ens0
>>>>>>>>>
>>>>>>>>> Send ping packet from other server to the VM.
>>>>>>>>> # ping6 2001:db8::18:1 -I eth0
>>>>>>>>>
>>>>>>>>> The following message was shown.
>>>>>>>>> ixgbevf 0000:00:08.0: partial checksum but l4 proto=3a!
>>>>>>>>>
>>>>>>>>> If I did the same operation in the host, I saw the same error
>>>>>>>>> message in
>>>>>>> host too.
>>>>>>>>> ixgbe 0000:2d:00.0: partial checksum but l4 proto=3a!
>>>>>>>>>
>>>>>>>>> Do you have any idea about that?
>>>>>>>>
>>>>>>>> Ah, sorry about that, try this tree again:
>>>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/queue.git
>>>>>>>>
>>>>>>>> That patch was dropped for favor of a patch that Matthew Vick
>>>>>>>> put together (and recently got pushed upstream). So my queue no
>>>>>>>> longer has that patch in the queue, since it got dropped.
>>>>>>>
>>>>>>> I still see the same error, the head id is the below
>>>>>>>
>>>>>>> $ git log | head
>>>>>>> commit a072afb0b45904022b76deef3b770ee9a93cb13a
>>>>>>> Author: Nicholas Krause <xerofoify@gmail.com>
>>>>>>> Date: Mon Feb 9 00:27:00 2015 -0800
>>>>>>>
>>>>>>> igb: Remove outdated fix me comment in the
>>>>>>> function,gb_acquire_swfw_sync_i210
>>>>>>>
>>>>>>>
>>>>>>> thanks,
>>>>>>> Hiroshi
>>>>>>
>>>>>> I'm having our validation see if they can recreate the same issue
>>>>>> internally. When they get back to me I'll let you
>>>>> know
>>>>>> what we found.
>>>>>
>>>>> We did bisect, and the below looks the culprit;
>>>>>
>>>>> 32dce968dd987adfb0c00946d78dad9154f64759 is the first bad commit
>>>>> commit 32dce968dd987adfb0c00946d78dad9154f64759
>>>>> Author: Vlad Yasevich <vyasevich@gmail.com>
>>>>> Date: Sat Jan 31 10:40:18 2015 -0500
>>>>>
>>>>> ipv6: Allow for partial checksums on non-ufo packets
>>>>>
>>>>> Currntly, if we are not doing UFO on the packet, all UDP
>>>>> packets will start with CHECKSUM_NONE and thus perform full
>>>>> checksum computations in software even if device support
>>>>> IPv6 checksum offloading.
>>>>>
>>>>> Let's start start with CHECKSUM_PARTIAL if the device
>>>>> supports it and we are sending only a single packet at
>>>>> or below mtu size.
>>>>>
>>>>> Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
>>>>> Signed-off-by: David S. Miller <davem@davemloft.net>
>>>>>
>>>>> :040000 040000 4437eaf7e944f5a6136ebf668a256fee688fda3d
>>>> fade8da998d35c8da97a15f0556949ad371e5347 M net
>>>>
>>>> When I reverted the commit, the issue was solved.
>>>>
>>>> thanks,
>>>> Hiroshi
>>>
>>> I believe the issue is that this patch (32dce968dd98 - ipv6: Allow for partial checksums on non-ufo packets) is that
>> it now sets CHECKSUM_PARTIAL on all IPv6 packets including ICMPv6 ones. Our HW (82599) only supports checksum offload
>> on TCP/UDP (NETIF_F_IPV6_CSUM) so we get hung up on the skb's protocol and the fact that it is CHECKSUM_PARTIAL.
>>>
>>> Another thing that confuses me is the feature test in this patch. It checks (rt->dst.dev->features & NETIF_F_V6_CSUM)
>> but NETIF_F_V6_CSUM is a two bit field?
>>>
>>> #define NETIF_F_V6_CSUM (NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
>>>
>>> So the test would succeed if either bit was high, that doesn't seem right. I cc'd the author so maybe he could clue
>> us in.
>>
>> This has been addressed by:
>> commit bf250a1fa769f2eb8fc7a4e28b3b523e9cb67eef
>> Author: Vlad Yasevich <vyasevich@gmail.com>
>> Date: Tue Feb 10 11:37:29 2015 -0500
>>
>> ipv6: Partial checksum only UDP packets
>>
>>
>> As far the 2 bit issue, GEN_CSUM (HW_SUM) and IPV6_CSUM can not coexist at the same time.
>> See netdev_fix_features().
>>
>
> thanks for pointing it. I will test with that commit.
>
> Jeff's tree hasn't included that commit yet, right?
> Which branch has the commit?
This is in DaveM's net and net-next trees.
-vlad
>
> thanks,
> Hiroshi
>
next prev parent reply other threads:[~2015-02-17 15:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-30 11:37 [PATCH 1/3] ixgbe, ixgbevf: Add new mbox API to enable MC promiscuous mode Hiroshi Shimamoto
2015-01-30 22:13 ` Skidmore, Donald C
2015-02-04 12:57 ` [E1000-devel] " Jeff Kirsher
2015-02-05 6:10 ` Hiroshi Shimamoto
2015-02-09 6:59 ` Hiroshi Shimamoto
2015-02-09 8:20 ` Jeff Kirsher
2015-02-10 2:28 ` Hiroshi Shimamoto
2015-02-11 22:59 ` Skidmore, Donald C
2015-02-11 23:33 ` Hiroshi Shimamoto
2015-02-13 4:44 ` Hiroshi Shimamoto
2015-02-13 17:26 ` Skidmore, Donald C
2015-02-13 17:34 ` Vlad Yasevich
2015-02-16 4:54 ` Hiroshi Shimamoto
2015-02-17 15:02 ` Vlad Yasevich [this message]
2015-02-17 23:30 ` Skidmore, Donald C
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