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References: <1599855987-25976-1-git-send-email-timothy.mcdaniel@intel.com>
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From: Jerin Jacob <jerinjacobk@gmail.com>
Date: Wed, 30 Sep 2020 00:16:27 +0530
Message-ID: <CALBAE1OC4_kb_xCJxxfPkf6i1TZ3NwkD-0p4gaWCUjYSLQ0jiA@mail.gmail.com>
To: Timothy McDaniel <timothy.mcdaniel@intel.com>,
Thomas Monjalon <thomas@monjalon.net>,
David Marchand <david.marchand@redhat.com>, Liang Ma <liang.j.ma@intel.com>
Cc: dpdk-dev <dev@dpdk.org>, Erik Gabriel Carrillo <erik.g.carrillo@intel.com>,
Gage Eads <gage.eads@intel.com>, "Van Haaren,
Harry" <harry.van.haaren@intel.com>, Jerin Jacob <jerinj@marvell.com>
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Subject: Re: [dpdk-dev] [PATCH 00/22] Add DLB2 PMD
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On Sat, Sep 12, 2020 at 2:00 AM Timothy McDaniel
<timothy.mcdaniel@intel.com> wrote:
>
> The following patch series adds support for a new eventdev PMD. The DLB2
> PMD adds support for the Intel Dynamic Load Balancer 2.0 (DLB2)
> hardware.
> The DLB2 is a PCIe device that provides load-balanced, prioritized
> scheduling of core-to-core communication. The device consists of
> queues and arbiters that connect producer and consumer cores, and
> implements load-balanced queueing features including:
> - Lock-free multi-producer/multi-consumer operation.
> - Multiple priority levels for varying traffic types.
> - 'Direct' traffic (i.e. multi-producer/single-consumer)
> - Simple unordered load-balanced distribution.
> - Atomic lock-free load balancing across multiple consumers.
> - Queue element reordering feature allowing ordered load-balanced
> distribution.
>
> The DLB2 hardware supports both load balanced and directed ports and
> queues. Unlike other eventdev devices already in the repo, not all
> DLB2 ports and queues are equally capable. In particular, directed
> ports are limited to a single link, and must be connected to a
> directed queue. Additionally, even though LDB ports may link multiple queues,
> the number of queues that may be linked is limited by hardware.
>
> While reviewing the code, please be aware that this PMD has full
> control over the DLB2 hardware. Intel will be extending the DLB2 PMD
> in the future (not as part of this first series) with a mode that we
> refer to as the bifurcated PMD. The bifurcated PMD communicates with a
> kernel driver to configure the device, ports, and queues, and memory
> maps device MMIO so datapath operations occur purely in user-space.
> Note that the DLB2 hardware is a successor of the DLB hardware, and
> as such is structured similarly, both in terms of code layout and
> implementation.
>
> The framework to support both the PF PMD and bifurcated PMD exists in
> this patchset, and is why the iface.[ch] layer is present.
>
> Depends-on: patch-77466 ("eventdev: add PCI probe named convenience function")
> Depends-on: series-12160 ("Eventdev ABI changes")
> Depends-on: patch-77460 ("eal: add umonitor umwait to x86 cpuflags")
Cc: Thomas and David
There is a duplicate for patch-77460 as
https://patches.dpdk.org/patch/76554/ from different authors,
and both are open comments to be closed.
@McDaniel, Timothy and @Liang Ma , We need to have this eal patch on
master before I merge this
patch series in eventdev-next. Please check.
>