Messages in this thread | | | From | "Chen, Mike Ximing" <> | Subject | RE: [RFC PATCH v12 01/17] dlb: add skeleton for DLB driver | Date | Mon, 27 Dec 2021 00:40:26 +0000 |
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> -----Original Message----- > From: Andrew Lunn <andrew@lunn.ch> > Sent: Thursday, December 23, 2021 5:23 AM > To: Chen, Mike Ximing <mike.ximing.chen@intel.com> > Cc: linux-kernel@vger.kernel.org; arnd@arndb.de; gregkh@linuxfoundation.org; Williams, Dan J > <dan.j.williams@intel.com>; pierre-louis.bossart@linux.intel.com; netdev@vger.kernel.org; > davem@davemloft.net; kuba@kernel.org > Subject: Re: [RFC PATCH v12 01/17] dlb: add skeleton for DLB driver > > On Thu, Dec 23, 2021 at 05:15:34AM +0000, Chen, Mike Ximing wrote: > > > > > > > -----Original Message----- > > > From: Andrew Lunn <andrew@lunn.ch> > > > Sent: Wednesday, December 22, 2021 4:27 PM > > > To: Chen, Mike Ximing <mike.ximing.chen@intel.com> > > > Cc: linux-kernel@vger.kernel.org; arnd@arndb.de; > > > gregkh@linuxfoundation.org; Williams, Dan J > > > <dan.j.williams@intel.com>; pierre-louis.bossart@linux.intel.com; > > > netdev@vger.kernel.org; davem@davemloft.net; kuba@kernel.org > > > Subject: Re: [RFC PATCH v12 01/17] dlb: add skeleton for DLB driver > > > > > > > > pointing to skbufs? How are the lifetimes of skbufs managed? How > > > > > do you get skbufs out of the NIC? Are you using XDP? > > > > > > > > This is not a network accelerator in the sense that it does not > > > > have direct access to the network sockets/ports. We do not use XDP. > > > > > > So not using XDP is a problem. I looked at previous versions of this > > > patch, and it is all DPDK. But DPDK is not in mainline, XDP is. In order for this to be merged into > mainline you need a mainline user of it. > > > > > > Maybe you should abandon mainline, and just get this driver merged into the DPDK fork of Linux? > > > > > Hi Andrew, > > > > I am not sure why not using XDP is a problem. As mentioned earlier, > > the DLB driver is not a part of network stack. > > > > DPDK is one of applications that can make a good use of DLB, but is > > not the only one. We have applications that access DLB directly via > > the kernel driver API without using DPDK. > > Cool. Please can you point at a repo for the code? As i said, we just need a userspace user, which gives us > a good idea how the hardware is supposed to be used, how the kAPI is to be used, and act as a good test > case for when kernel modifications are made. But it needs to be pure mainline. > > There have been a few good discussion on LWN about accelerators recently. Worth reading. > We don't have a public repo for dlb yet, but you can download the dlb software package at https://www.intel.com/content/www/us/en/download/686372/intel-dynamic-load-balancer.html. It includes dlb kernel driver and sample user applications (for both DPDK and non-DPDK users).
I will check out the discussion on LWN. Thanks for the suggestion.
Mike
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