On 2/13/2023 5:31 PM, Shepard Siegel wrote: > Yes, what is different here is that the MBUF size is communicated > from the PMD to the hardware which *changes its behavior* of data motion > to optimize throughput and latency as a function of that setting. And it > does that per-queue. And can be done at runtime (that's the > dynamic part). ... To the best our knowledge, other PMDs use this as a > host-software setting only - and their DPDK naive DMA engines just use > the same fixed settings (respecting PCIe, of course). > > Hope that helps. If it is contentious in any way, we are fine with > removing that line. We added it as users have remarked it is a unique > capability they think we should point out. >
Just trying to clarify the feature you are referring, this helps to your users too. I was thinking this feature is already granted and if there is more details in the documented feature, but it is not granted and OK to keep as it is. > -Shep > > > On Mon, Feb 13, 2023 at 12:23 PM Ferruh Yigit <ferruh.yi...@amd.com > <mailto:ferruh.yi...@amd.com>> wrote: > > On 2/13/2023 5:09 PM, Shepard Siegel wrote: > > Hi Ferruh, > > > > Yes, there will probably be next versions in the future. If you don't > > mind making the marker length adjustment, that would be great. > > > > Regarding MBUF (re)sizing - Arkville supports the ability to > configure > > or reconfigure the MBUF size used on a per-queue basis. This > feature is > > useful when the are conflicting motivations for using smaller/larger > > MBUF sizes. For example, user can switch a queue to use a size > best for > > that queue's application workload. > > > > Application can allocate multiple mempool with different sizes and set > these to specific queues, this is same for all PMDs, is ark PMD doing > something specific here? Or are you referring to something else? > > And what does 'dynamic' emphasis means here? > > > > -Shep > > > > > > On Mon, Feb 13, 2023 at 10:46 AM Ferruh Yigit > <ferruh.yi...@amd.com <mailto:ferruh.yi...@amd.com> > > <mailto:ferruh.yi...@amd.com <mailto:ferruh.yi...@amd.com>>> wrote: > > > > On 2/13/2023 2:58 PM, Shepard Siegel wrote: > > > Add detail for the existing Arkville configurations FX0 and FX1. > > > Corrected minor errors of omission. > > > > > > Signed-off-by: Shepard Siegel > <shepard.sie...@atomicrules.com <mailto:shepard.sie...@atomicrules.com> > > <mailto:shepard.sie...@atomicrules.com > <mailto:shepard.sie...@atomicrules.com>>> > > > --- > > > doc/guides/nics/ark.rst | 18 ++++++++++++++++++ > > > 1 file changed, 18 insertions(+) > > > > > > diff --git a/doc/guides/nics/ark.rst b/doc/guides/nics/ark.rst > > > index ba00f14e80..edaa02dc96 100644 > > > --- a/doc/guides/nics/ark.rst > > > +++ b/doc/guides/nics/ark.rst > > > @@ -52,6 +52,10 @@ board. While specific capabilities such as > > number of physical > > > hardware queue-pairs are negotiated; the driver is designed to > > > remain constant over a broad and extendable feature set. > > > > > > +* FPGA Vendors Supported: AMD/Xilinx and Intel > > > +* Number of RX/TX Queue-Pairs: up to 128 > > > +* PCIe Endpoint Technology: Gen3, Gen4, Gen5 > > > + > > > Intentionally, Arkville by itself DOES NOT provide common NIC > > > capabilities such as offload or receive-side scaling (RSS). > > > These capabilities would be viewed as a gate-level "tax" on > > > @@ -303,6 +307,18 @@ ARK PMD supports the following Arkville RTL > > PCIe instances including: > > > * ``1d6c:101e`` - AR-ARKA-FX1 [Arkville 64B DPDK Data Mover for > > Agilex R-Tile] > > > * ``1d6c:101f`` - AR-TK242 [2x100GbE Packet Capture Device] > > > > > > +Arkville RTL Core Configurations > > > +------------------------------------- > > > + > > > > The title marker length (-) should be same as title length, > can you > > please fix if there will be next version, if not I can fix while > > merging. > > > > > > > +Arkville's RTL core may be configured by the user with > different > > > +datapath widths to balance throughput against FPGA logic area. > > The ARK PMD > > > +has introspection on the RTL core configuration and acts > accordingly. > > > +All Arkville configurations present identical RTL > user-facing AXI > > stream > > > +interfaces for both AMD/Xilinx and Intel FPGAs. > > > + > > > +* ARK-FX0 - 256-bit 32B datapath (PCIe Gen3, Gen4) > > > +* ARK-FX1 - 512-bit 64B datapath (PCIe Gen3, Gen4, Gen5) > > > + > > > DPDK and Arkville Firmware Versioning > > > ------------------------------------- > > > > > > @@ -334,6 +350,8 @@ Supported Features > > > ------------------ > > > > > > * Dynamic ARK PMD extensions > > > +* Dynamic per-queue MBUF (re)sizing up to 32KB > > > > What is this feature? What does it mean to size/resize mbuf > dynamically? > > > > > +* SR-IOV, VF-based queue-segregation > > > * Multiple receive and transmit queues > > > * Jumbo frames up to 9K > > > * Hardware Statistics > > >
