packet received in a wrong rx-queue?

packet received in a wrong rx-queue?

[Jon Zhou]

There are 2 packets in the traffic

#1 create PDP context request, IPV4--UDP--GTP, src_ip=A and dst_ip=B,src_port=C,dst_port=D

#2 create PDP context response, IPV4--UDP--GTP,src_ip=B, dst_ip=A, src_port=D,dst_port=C

I suppose both of them will be received in same rx-queue but actually it doesn't
Anything need to check?

ethtool -i eth5
driver: ixgbe
version: 3.3.9-NAPI
firmware-version: 0.9-3
bus-info: 0000:08:00.1

regards
jon





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Re: packet received in a wrong rx-queue?

[David Miller]

From: Jon Zhou <Jon.Zhou@jdsu.com>
Date: Wed, 18 May 2011 02:00:50 -0700

> There are 2 packets in the traffic
> 
> #1 create PDP context request, IPV4--UDP--GTP, src_ip=A and dst_ip=B,src_port=C,dst_port=D
> 
> #2 create PDP context response, IPV4--UDP--GTP,src_ip=B, dst_ip=A, src_port=D,dst_port=C
> 
> I suppose both of them will be received in same rx-queue but actually it doesn't

Well, for hardware flow steering, it's not expected to.

RE: packet received in a wrong rx-queue?

[Jon Zhou]

[-- Attachment #1: Type: text/plain, Size: 1488 bytes --]

Anyone can help to check the traffic file?

Thanks
jon

> -----Original Message-----
> From: Jon Zhou [mailto:Jon.Zhou@jdsu.com]
> Sent: Wednesday, May 18, 2011 5:01 PM
> To: e1000-devel@lists.sourceforge.net; netdev@vger.kernel.org
> Subject: [E1000-devel] packet received in a wrong rx-queue?
> 
> There are 2 packets in the traffic
> 
> #1 create PDP context request, IPV4--UDP--GTP, src_ip=A and
> dst_ip=B,src_port=C,dst_port=D
> 
> #2 create PDP context response, IPV4--UDP--GTP,src_ip=B, dst_ip=A,
> src_port=D,dst_port=C
> 
> I suppose both of them will be received in same rx-queue but actually
> it doesn't
> Anything need to check?
> 
> ethtool -i eth5
> driver: ixgbe
> version: 3.3.9-NAPI
> firmware-version: 0.9-3
> bus-info: 0000:08:00.1
> 
> regards
> jon
> 
> 
> 
> 
> 
> -----------------------------------------------------------------------
> -------
> What Every C/C++ and Fortran developer Should Know!
> Read this article and learn how Intel has extended the reach of its
> next-generation tools to help Windows* and Linux* C/C++ and Fortran
> developers boost performance applications - including clusters.
> http://p.sf.net/sfu/intel-dev2devmay
> _______________________________________________
> E1000-devel mailing list
> E1000-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/e1000-devel
> To learn more about Intel® Ethernet, visit
> http://communities.intel.com/community/wired

[-- Attachment #2: UpdatePdpContextTransaction12-WithCreatePdpDeletePdp.pcap --]
[-- Type: application/octet-stream, Size: 1187 bytes --]

Re: packet received in a wrong rx-queue?

[David Miller]

From: Jon Zhou <Jon.Zhou@jdsu.com>
Date: Wed, 18 May 2011 18:26:07 -0700

> Anyone can help to check the traffic file?

I told you yesterday that this behavior is expected.

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RE: packet received in a wrong rx-queue?

[Jon Zhou]

> -----Original Message-----
> From: David Miller [mailto:davem@davemloft.net]
> Sent: Thursday, May 19, 2011 9:32 AM
> To: Jon Zhou
> Cc: e1000-devel@lists.sourceforge.net; netdev@vger.kernel.org
> Subject: Re: packet received in a wrong rx-queue?
> 
> From: Jon Zhou <Jon.Zhou@jdsu.com>
> Date: Wed, 18 May 2011 18:26:07 -0700
> 
> > Anyone can help to check the traffic file?
> 
> I told you yesterday that this behavior is expected.

form the 82599 datasheet, the hash algorithm is consist of src/dst ip, src/dst port,protocol
why it got different hash value with same ip/port pair?

Re: packet received in a wrong rx-queue?

[David Miller]

From: Jon Zhou <Jon.Zhou@jdsu.com>
Date: Wed, 18 May 2011 20:22:07 -0700

> form the 82599 datasheet, the hash algorithm is consist of src/dst
> ip, src/dst port,protocol why it got different hash value with same
> ip/port pair?

The same reason why feeding different sets of discrete 32-bit and
16-bit values to a cryptographic hash results in a different final
hash value.

Our software RPS/RFS implementation used to have this quality too.

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RE: packet received in a wrong rx-queue?

[Jon Zhou]

> -----Original Message-----
> From: David Miller [mailto:davem@davemloft.net]
> Sent: Thursday, May 19, 2011 11:36 AM
> To: Jon Zhou
> Cc: e1000-devel@lists.sourceforge.net; netdev@vger.kernel.org
> Subject: Re: packet received in a wrong rx-queue?
> 
> From: Jon Zhou <Jon.Zhou@jdsu.com>
> Date: Wed, 18 May 2011 20:22:07 -0700
> 
> > form the 82599 datasheet, the hash algorithm is consist of src/dst
> > ip, src/dst port,protocol why it got different hash value with same
> > ip/port pair?
> 
> The same reason why feeding different sets of discrete 32-bit and
> 16-bit values to a cryptographic hash results in a different final
> hash value.
> 
> Our software RPS/RFS implementation used to have this quality too.

Even that it gets different hash value, both packets should be delivered to same rx-queue,

Because they are belong to same flow?

Re: packet received in a wrong rx-queue?

[David Miller]

From: Jon Zhou <Jon.Zhou@jdsu.com>
Date: Thu, 19 May 2011 18:48:02 -0700

> Even that it gets different hash value, both packets should be delivered to same rx-queue,
> 
> Because they are belong to same flow?

That's not how it works.  They go to different queues, because the bits
are different for the flow keys in each direction.

I think we've brought this discussion to a conclusion, and that this
behavior is intentional.

Thank you.

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next-generation tools to help Windows* and Linux* C/C++ and Fortran 
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