[dpdk-dev] [PATCH v4] ixgbe: Drop flow control frames from VFs

Zhang, Helin helin.zhang at intel.com
Fri Oct 23 09:14:26 CEST 2015



From: Vladislav Zolotarov [mailto:vladz at cloudius-systems.com] 
Sent: Friday, October 23, 2015 2:57 PM
To: Zhang, Helin
Cc: Lu, Wenzhuo; dev at dpdk.org
Subject: RE: [dpdk-dev] [PATCH v4] ixgbe: Drop flow control frames from VFs


On Oct 23, 2015 9:30 AM, "Zhang, Helin" <helin.zhang at intel.com> wrote:
>
>
>
> From: Vladislav Zolotarov [mailto:vladz at cloudius-systems.com]
> Sent: Friday, October 23, 2015 2:24 PM
> To: Zhang, Helin
> Cc: Lu, Wenzhuo; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v4] ixgbe: Drop flow control frames from VFs
>
>
> On Oct 23, 2015 9:02 AM, "Zhang, Helin" <helin.zhang at intel.com> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Lu, Wenzhuo
> > > Sent: Friday, October 23, 2015 1:52 PM
> > > To: dev at dpdk.org
> > > Cc: Zhang, Helin; Lu, Wenzhuo
> > > Subject: [PATCH v4] ixgbe: Drop flow control frames from VFs
> > >
> > > This patch will drop flow control frames from being transmitted from VSIs.
> > > With this patch in place a malicious VF cannot send flow control or PFC packets
> > > out on the wire.
> The whole idea of this (and similar i40e patches sent before) is really confusing.
> If u want to disable FC feature for VFs then go and disable the feature. Why keep (not malicious) user think that he/she has enabled the feature while u silently block it?
>
> Helin: I don't think disabling FC is equal to filtering out any pause frames. How about the software application constructs a pause frame and then tries to send it out?
But not disabling FC for the user and silently preventing it is bogus. First, the conventional user should not be affected. I think this patch (and all its clones) should be extended to, first, disable the FC Tx feature for the relevant devices and only then adding any anti malicious filtering. 
 
Helin: Disabling FC will disable both PF and VF FC, I don't find out where can disable VF FC only. Am I wrong?

>
> > >
> > > V2:
> > > Reword the comments.
> > >
> > > V3:
> > > Move the check of set_ethertype_anti_spoofing to the top of the function, to
> > > avoid occupying an ethertype_filter entity without using it.
> > >
> > > V4:
> > > Remove the useless braces and return.
> > >
> > > Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
> > Acked-by: Helin Zhang <helin.zhang at intel.com>
> >


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