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From: Gregory Etelson <getelson@nvidia.com>
To: "Van Haaren, Harry" <harry.van.haaren@intel.com>
CC: "dev@dpdk.org" <dev@dpdk.org>, "Richardson, Bruce"
<bruce.richardson@intel.com>, "owen.hilyard@unh.edu" <owen.hilyard@unh.edu>
Subject: Re: [PATCH] rust: RFC/demo of safe API for Dpdk Eal, Eth and Rxq
Thread-Topic: [PATCH] rust: RFC/demo of safe API for Dpdk Eal, Eth and Rxq
Thread-Index: AQHbr6r1ijGnPC1ap0e+6CWAdV93u7OoNgYAgAEX6wCAAvBHrIAGyB+AgATktQCABK7JgA==
Date: Wed, 30 Apr 2025 18:28:49 +0000
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--_000_IA1PR12MB6330872DB96BB9D83EF7EFF2A5832IA1PR12MB6330namp_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hello Harry,
I've been experimenting with lcore workers.
Please check out the new helloworld example: https://github.com/getelson-a=
t-mellanox/rdpdk/blob/safe-q/examples/helloworld.rs
There are 2 options for the example configuration:
1 Start RDPDK workers on the same cores as EAL:
cargo run --example helloworld -- -a <PCI address> -l 0,1,3,5
2 Start RDPDK workers on dedicated cores:
cargo run --example helloworld -- -a 0000:43:00.0 -l 0,1,3,5 -- -l 2-8
Regards,
Gregory
________________________________
From: Gregory Etelson <getelson@nvidia.com>
Sent: Sunday, April 27, 2025 21:50
To: Van Haaren, Harry <harry.van.haaren@intel.com>
Cc: Gregory Etelson <getelson@nvidia.com>; dev@dpdk.org <dev@dpdk.org>; Ric=
hardson, Bruce <bruce.richardson@intel.com>; owen.hilyard@unh.edu <owen.hil=
yard@unh.edu>
Subject: Re: [PATCH] rust: RFC/demo of safe API for Dpdk Eal, Eth and Rxq
Hello Harry,
> > I implemented a working echo server with your API.
> > The code is here: https://github.com/getelson-at-mellanox/rdpdk/tree/sa=
fe-q
>
> Ah cool! Great to see the API working.
>
> Reviewing the "echo.rs" code, the MbuffMempoolHandle ergonomics can perha=
ps be improved,
> I'll try work on that and have some API suggestions to the mailing list s=
oon.
>
> I see the echo.rs code uses a normal "std::thread::spawn" (not DPDK lcore=
s), there is
> some design to do here to ensuring that best practices are used;
> - any dataplane threads are registered as lcores (for best performance, m=
empool caches etc)
> - registered lcores are also unregistered when a thread ends (potentially=
allowing lcore-id reuse??)
> I haven't thought about this much, but had a brief discussion with Bruce =
(who is on holidays now).
>
> Suggesting that mempools & lcores are the two next up API sets to "Rustif=
y" :)
>
I see 2 issues with the DPDK lcore API:
Unsafe "extern" lcore callback is not considered as new thread and compiler
will not run arguments Send verifications.
Also lcore arguments use generic 'void *' pointer.
Maybe Rust DPDK library needs native lcore implementation.
Differnet thread agrument types can we wrapped with a macro call.
Example is here:
https://github.com/getelson-at-mellanox/rdpdk/blob/37494bcae1fcf06bb4338519=
f931c2130105e576/examples/echo.rs#L88
Regards,
Gregory
--_000_IA1PR12MB6330872DB96BB9D83EF7EFF2A5832IA1PR12MB6330namp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
Hello Harry,</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
I've been experimenting with lcore workers.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
Please check out the new helloworld example: <a href=3D"https://githu=
b.com/getelson-at-mellanox/rdpdk/blob/safe-q/examples/helloworld.rs" id=3D"=
OWA7a51a07b-97ea-b10c-f04a-a6e94f3d1b64" class=3D"OWAAutoLink">
https://github.com/getelson-at-mellanox/rdpdk/blob/safe-q/examples/hellowor=
ld.rs</a></div>
<div id=3D"appendonsend"></div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; c=
olor: rgb(0, 0, 0);">
There are 2 options for the example configuration:</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
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1 Start RDPDK workers on the same cores as EAL: <br>
cargo run --example helloworld -- -a <PCI address> -l 0=
,1,3,5<br>
<br>
2 Start RDPDK workers on dedicated cores:<br>
cargo run --example helloworld -- -a 0000:43:00.0 -l 0,1,3,5 =
-- -l 2-8</div>
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Regards,</div>
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Gregory</div>
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<hr style=3D"display: inline-block; width: 98%;">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><span style=3D"font-family: Calibri, =
sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Gregor=
y Etelson <getelson@nvidia.com><br>
<b>Sent:</b> Sunday, April 27, 2025 21:50<br>
<b>To:</b> Van Haaren, Harry <harry.van.haaren@intel.com><br>
<b>Cc:</b> Gregory Etelson <getelson@nvidia.com>; dev@dpdk.org &=
lt;dev@dpdk.org>; Richardson, Bruce <bruce.richardson@intel.com>; =
owen.hilyard@unh.edu <owen.hilyard@unh.edu><br>
<b>Subject:</b> Re: [PATCH] rust: RFC/demo of safe API for Dpdk Eal, E=
th and Rxq</span>
<div> </div>
</div>
<div style=3D"font-size: 11pt;">Hello Harry,<br>
<br>
> > I implemented a working echo server with your API.<br>
> > The code is here: <a href=3D"https://github.com/getelson-at-mella=
nox/rdpdk/tree/safe-q" id=3D"OWA7afd59b3-9b37-32bc-9bc0-16ca5a27245c" class=
=3D"OWAAutoLink" data-auth=3D"NotApplicable">
https://github.com/getelson-at-mellanox/rdpdk/tree/safe-q</a><br>
><br>
> Ah cool! Great to see the API working.<br>
><br>
> Reviewing the "echo.rs" code, the MbuffMempoolHandle ergonom=
ics can perhaps be improved,<br>
> I'll try work on that and have some API suggestions to the mailing lis=
t soon.<br>
><br>
> I see the echo.rs code uses a normal "std::thread::spawn" (n=
ot DPDK lcores), there is<br>
> some design to do here to ensuring that best practices are used;<br>
> - any dataplane threads are registered as lcores (for best performance=
, mempool caches etc)<br>
> - registered lcores are also unregistered when a thread ends (potentia=
lly allowing lcore-id reuse??)<br>
> I haven't thought about this much, but had a brief discussion with Bru=
ce (who is on holidays now).<br>
><br>
> Suggesting that mempools & lcores are the two next up API sets to =
"Rustify" :)<br>
><br>
<br>
I see 2 issues with the DPDK lcore API:<br>
<br>
Unsafe "extern" lcore callback is not considered as new thread an=
d compiler<br>
will not run arguments Send verifications.<br>
<br>
Also lcore arguments use generic 'void *' pointer.<br>
<br>
Maybe Rust DPDK library needs native lcore implementation.<br>
<br>
Differnet thread agrument types can we wrapped with a macro call.<br>
Example is here:<br>
<a href=3D"https://github.com/getelson-at-mellanox/rdpdk/blob/37494bcae1fcf=
06bb4338519f931c2130105e576/examples/echo.rs#L88" id=3D"OWA7e93c2eb-d2f9-0d=
ea-b07b-d81f00fcbd6b" class=3D"OWAAutoLink" data-auth=3D"NotApplicable">htt=
ps://github.com/getelson-at-mellanox/rdpdk/blob/37494bcae1fcf06bb4338519f93=
1c2130105e576/examples/echo.rs#L88</a><br>
<br>
Regards,<br>
Gregory<br>
<br>
</div>
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