[dpdk-dev] Which vmxnet3 pmd is to be used in dpdk 1.6.x?

Prashant Upadhyaya prashant.upadhyaya at aricent.com
Thu Mar 6 07:50:27 CET 2014


Some further update on the crash I am facing.
I am using DPDK1.6.0r1 and take over the vmxnet3 with igb_uio and then start the application. (so no external ko or vmxnet usermap etc.)
During the port initializations, the crash is happening in the following function -


and the crash is happening at the following line -
/* Check h/w version compatibility with driver. */

Any hints regarding what could be wrong ?


From: Prashant Upadhyaya
Sent: Wednesday, March 05, 2014 9:01 PM
To: 'David Marchand'
Cc: Srinivasan J; dev at dpdk.org
Subject: RE: [dpdk-dev] Which vmxnet3 pmd is to be used in dpdk 1.6.x?

Hi David,

The compilation error with debug flags on was that the functions -- vmxnet3_txq_dump, vmxnet3_rxq_dump - are defined but not used.
Not a serious error, I will try to get rid of the compiler flag which generates this.

However, I must reiterate, I _did_ bind my vmxnet3 device with igb_uio (and I did not use any .so, because I was intending to use the builtin vmxnet3 driver of dpdk 1.6.0r1), the bind succeeded, but then when I started the application, the dev init for vmxnet3 gave a core dump.
Your patch and solution seems to be suggesting the reverse, i.e. when I don't bind with igb_uio but try to use the native driver. So please do try the above combination as well.


From: David Marchand [mailto:david.marchand at 6wind.com]
Sent: Wednesday, March 05, 2014 8:41 PM
To: Prashant Upadhyaya
Cc: Srinivasan J; dev at dpdk.org<mailto:dev at dpdk.org>
Subject: Re: [dpdk-dev] Which vmxnet3 pmd is to be used in dpdk 1.6.x?

Hello Prashant,

On Wed, Mar 5, 2014 at 3:28 PM, Prashant Upadhyaya <prashant.upadhyaya at aricent.com<mailto:prashant.upadhyaya at aricent.com>> wrote:

I am also keen to know the answer to the question posted by Srini.
The real question is -- is dpdk1.6.0r1 self-sufficient so that I don't need any extensions etc., or do I still need something from outside like the usermap kernel driver etc.

Secondly, if I turn on all the debug options for the vmxnet3 pmd in the config file, 1.6.0r1 compilation runs into a problem and reports a function which is defined but not used.

Can you send your build error ? (maybe in a separate thread ?)

I am trying to bring up DPDK inside Fedora18 Guest on ESXi -- when I used DPDK1.6.0r1 (without debug options turned on for vmxnet3 pmd) the igb_uio could take over the vmxnet3 NIC but I encountered a core dump in the dev init function for the vmxnet3 driver -- anybody encountered a similar issue ?

I encountered these problems as well.

- igb_uio module does not check if you disable vmxnet3-uio pmds, it will always try to take over vmxnet3 devices.
I have a patch waiting in my working dir to cleanly disable vmxnet3-uio pmd.

- If you don't bind vmxnet3 devices to uio, but forget to enable vmxnet3-usermap pmd (by specifiying -d librte_pmd_vmxnet3.so), then internal vmxnet3-uio pmd will try to initialise and crash.
I did not look any deeper into this, the easiest way is to disable vmxnet3-uio pmd + apply the patch I will send in a few minutes, as a first workaround.

David Marchand

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