From: Bruce Richardson <bruce.richardson@intel.com>
To: "Wang, Xiao W" <xiao.w.wang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v3 1/3] fm10k: enable FTAG based forwarding
Date: Fri, 26 Feb 2016 14:48:52 +0000 [thread overview]
Message-ID: <20160226144852.GC21628@bricha3-MOBL3> (raw)
In-Reply-To: <B7F2E978279D1D49A3034B7786DACF403DBAD229@SHSMSX101.ccr.corp.intel.com>
On Fri, Feb 26, 2016 at 09:24:06AM +0000, Wang, Xiao W wrote:
> Hi,
>
> > -----Original Message-----
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > Sent: Friday, February 26, 2016 5:06 PM
> > To: Wang, Xiao W <xiao.w.wang@intel.com>
> > Cc: Richardson, Bruce <bruce.richardson@intel.com>; Chen, Jing D
> > <jing.d.chen@intel.com>; dev@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH v3 1/3] fm10k: enable FTAG based forwarding
> >
> > 2016-02-26 04:31, Wang, Xiao W:
> > > From: Richardson, Bruce
> > > > On Thu, Feb 25, 2016 at 03:45:45PM +0000, Chen, Jing D wrote:
> > > > > From: Richardson, Bruce
> > > > > > On Thu, Feb 25, 2016 at 10:04:02AM +0000, Chen, Jing D wrote:
> > > > > > > This feature is trying to use FTAG (a unique tech in fm10k)
> > > > > > > instead of mac/vlan to forward packets. App need a way to tell
> > > > > > > PMD driver that which forwarding style it would like to use.
> > > > > >
> > > > > > Why not just specify this in the port configuration at setup time?
> > > > > >
> > > > >
> > > > > Please educate me. I think the port configuration flags are also
> > > > > common to all PMD Drivers. Is it possible to add a flag like
> > "RTE_USE_FTAG"
> > > > and pass to PMD driver?
> > > > >
> > > > They are.
> > > > For something PMD specific, like FTAG, it's always a challenge, and
> > > > I don't know off the top of my head if there is a simple option.
> > > > However, given the choice between an mbuf flag and a port config
> > > > flag, I'd always choose the former.
> > > > Other alternatives would be to have a fm10k specific API in the
> > > > fm10k driver alone.
> > > >
> > > > I'll let Thomas as ethdev maintainer comment if he has other
> > > > suggestions as to how to handle this case. I suspect this won't be
> > > > the first device-specific piece of functionality we need to deal with.
> > > >
> > > > /Bruce
> > >
> > > Whatever method we choose, we have to find a way for the user to
> > > express his need for FTAG, it maybe a build time config option, or a
> > > port config flag (no such flag now), or a fast path flag in mbuf (no
> > > such flag now) etc. For the customer Topsec's use case, they use FTAG
> > > for all the TX packets, so all the above methods (per build config,
> > > per port config, per mbuf config) can meet their need. Since the pmd
> > > frame work is for common, it's hard to add new fields only for one specific
> > NIC, so I add a build time config and make an introduction in the doc.
> > >
> > > Thanks for the discussion, Thomas, do you have any suggestions?
> >
> > I don't understand why you say this feature is specific to fm10k. Can we
> > imagine another NIC having this capability?
>
> As you know, fm10k has a switch logic between the Mac and Phy, every packets
> Sent out from the host will be switched inside the NIC, other NICs don't have
> a switch inside, and the FTAG feature is related to the switch function.
>
> As introduced in the second patch:
> The FM10K family of NICs support the addition of a Fabric Tag (FTAG) to carry
> special information. The FTAG is placed at the beginning of the frame, it contains
> information such as where the packet comes from and goes, and the vlan tag. In
> FTAG based forwarding mode, the switch logic forwards packets according to
> glort (global resource tag) information, rather than the mac and vlan table.
> So this is a feature specific to fm10k.
>
> Best Regards,
> Xiao
If it is fm10k specific, how about just adding a public function to the fm10k
driver to turn it on. The user app will be non-portable across NICs, but
that's the price of using nic-specific features.
/Bruce
> > I think it must be an port configuration, as Bruce suggested.
> > What about a field in struct rte_eth_conf?
next prev parent reply other threads:[~2016-02-26 14:49 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-25 8:07 [dpdk-dev] [PATCH 0/3] " Wang Xiao W
2016-01-25 8:07 ` [dpdk-dev] [PATCH 1/3] " Wang Xiao W
2016-02-02 3:07 ` Qiu, Michael
2016-02-02 10:03 ` Wang, Xiao W
2016-02-02 10:50 ` [dpdk-dev] [PATCH v2 0/3] " Wang Xiao W
2016-02-02 10:50 ` [dpdk-dev] [PATCH v2 1/3] " Wang Xiao W
2016-02-03 6:52 ` Chen, Jing D
2016-02-04 2:39 ` Wang, Xiao W
2016-02-04 3:38 ` [dpdk-dev] [PATCH v3 0/3] " Wang Xiao W
2016-02-04 3:38 ` [dpdk-dev] [PATCH v3 1/3] " Wang Xiao W
2016-02-24 15:42 ` Bruce Richardson
2016-02-24 16:37 ` Thomas Monjalon
2016-02-24 17:05 ` Bruce Richardson
2016-02-25 10:04 ` Chen, Jing D
2016-02-25 13:35 ` Bruce Richardson
2016-02-25 15:45 ` Chen, Jing D
2016-02-25 16:14 ` Bruce Richardson
2016-02-26 4:31 ` Wang, Xiao W
2016-02-26 9:06 ` Thomas Monjalon
2016-02-26 9:24 ` Wang, Xiao W
2016-02-26 14:48 ` Bruce Richardson [this message]
2016-02-26 15:00 ` David Marchand
2016-02-26 16:33 ` Bruce Richardson
2016-02-29 1:47 ` Wang, Xiao W
2016-02-26 20:48 ` Thomas Monjalon
2016-03-01 5:36 ` [dpdk-dev] [PATCH v4 0/3] " Wang Xiao W
2016-03-01 5:36 ` [dpdk-dev] [PATCH v4 1/3] " Wang Xiao W
2016-03-01 7:35 ` Thomas Monjalon
2016-03-01 11:06 ` Wang, Xiao W
2016-03-01 22:37 ` Stephen Hemminger
2016-03-02 6:05 ` Wang, Xiao W
2016-03-02 13:47 ` Thomas Monjalon
2016-03-02 11:19 ` [dpdk-dev] [PATCH v5 0/2] " Wang Xiao W
2016-03-02 11:19 ` [dpdk-dev] [PATCH v5 1/2] " Wang Xiao W
2016-03-10 16:32 ` Bruce Richardson
2016-03-02 11:19 ` [dpdk-dev] [PATCH v5 2/2] doc: add introduction for fm10k " Wang Xiao W
2016-03-08 7:57 ` [dpdk-dev] [PATCH v5 0/2] fm10k: enable " Liu, Yong
2016-03-10 3:34 ` Wang, Xiao W
2016-03-10 16:40 ` Bruce Richardson
2016-03-01 5:36 ` [dpdk-dev] [PATCH v4 2/3] doc: add introduction for fm10k " Wang Xiao W
2016-03-01 5:36 ` [dpdk-dev] [PATCH v4 3/3] doc: update release note for fm10k FTAG support Wang Xiao W
2016-02-04 3:38 ` [dpdk-dev] [PATCH v3 2/3] doc: add introduction for fm10k FTAG based forwarding Wang Xiao W
2016-02-22 14:06 ` Mcnamara, John
2016-02-04 3:38 ` [dpdk-dev] [PATCH v3 3/3] doc: update release note for fm10k FTAG support Wang Xiao W
2016-02-22 13:51 ` Mcnamara, John
2016-02-04 9:47 ` [dpdk-dev] [PATCH v3 0/3] fm10k: enable FTAG based forwarding Chen, Jing D
2016-02-02 10:50 ` [dpdk-dev] [PATCH v2 2/3] doc: add introduction for fm10k " Wang Xiao W
2016-02-02 10:50 ` [dpdk-dev] [PATCH v2 3/3] doc: update release note for fm10k FTAG support Wang Xiao W
2016-01-25 8:07 ` [dpdk-dev] [PATCH 2/3] doc: add introduction for fm10k FTAG based forwarding Wang Xiao W
2016-01-25 8:07 ` [dpdk-dev] [PATCH 3/3] doc: update release note for fm10k FTAG support Wang Xiao W
2016-02-01 16:20 ` Mcnamara, John
2016-01-26 6:01 ` [dpdk-dev] [PATCH 0/3] fm10k: enable FTAG based forwarding Liu, Yong
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