Re: [dpdk-dev] [PATCH 00/22] Add DLB2 PMD

[Jerin Jacob <jerinjacobk@gmail.com>]

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.


>