[dpdk-web] [PATCH] update Arm roadmap for 20.08

[dpdk-web] [PATCH] update Arm roadmap for 20.08

[Honnappa Nagarahalli]

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
 content/roadmap/_index.md | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/content/roadmap/_index.md b/content/roadmap/_index.md
index 4dd7b3e..3766b1d 100644
--- a/content/roadmap/_index.md
+++ b/content/roadmap/_index.md
@@ -13,6 +13,12 @@ This list is obviously neither complete nor guaranteed.
 
 - flow action object API
 - flow sampling and mirroring API
+- Bit operations APIs for PMDs
+- rte_atomic API deprecation with-in DPDK
+- Use C11 atomic semantics in mbuf, eventdev, eal interrupts
+- CPU frequency calculation using generic counter for Arm platforms
+- LPM library integration with RCU library
+- Change IO barriers to align with other-multi-copy atomicity memory model for Armv8-a
 - performance optimizations in mlx drivers for Arm platforms
 - mlx5 memory management options, and queue stop/start
 - mlx5 eCPRI matching and Tx scheduling for 5G
@@ -32,7 +38,7 @@ This list is obviously neither complete nor guaranteed.
 
 ### Nice to have - Future {#future}
 ----
-- integrate RCU deferred resource reclamation API with LPM and hash libraries
+- integrate RCU deferred resource reclamation API with hash library
 - lock-free l3fwd algorithms
 - multi-process rework
 - automatic UIO/VFIO binding
-- 
2.17.1

Re: [dpdk-web] [PATCH] update Arm roadmap for 20.08

[Thomas Monjalon]

09/06/2020 05:28, Honnappa Nagarahalli:
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

Additional explanation:
Was announced in the dpdk-dev mailing list:
http://mails.dpdk.org/archives/dev/2020-June/169542.html

> +- Bit operations APIs for PMDs
> +- rte_atomic API deprecation with-in DPDK

Deprecation is not a feature to coordinate in the roadmap I think.

> +- Use C11 atomic semantics in mbuf, eventdev, eal interrupts
> +- CPU frequency calculation using generic counter for Arm platforms
> +- LPM library integration with RCU library

I would word it in reverse order: isn't it the RCU lib which is integrated in LPM?

> +- Change IO barriers to align with other-multi-copy atomicity memory model for Armv8-a

I don't understand "other-multi-copy atomicity".

Re: [dpdk-web] [PATCH] update Arm roadmap for 20.08

[Honnappa Nagarahalli]

Thanks Thomas for your comments.

> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Tuesday, June 9, 2020 3:08 AM
> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> Cc: web@dpdk.org; nd <nd@arm.com>
> Subject: Re: [PATCH] update Arm roadmap for 20.08
> 
> 09/06/2020 05:28, Honnappa Nagarahalli:
> > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> 
> Additional explanation:
> Was announced in the dpdk-dev mailing list:
> http://mails.dpdk.org/archives/dev/2020-June/169542.html
> 
> > +- Bit operations APIs for PMDs
> > +- rte_atomic API deprecation with-in DPDK
> 
> Deprecation is not a feature to coordinate in the roadmap I think.
Ok, no problem. I just wanted to make sure that the community is on-board in reviewing the patch and making decisions. I guess the proposal on the mailing list is enough for that?

> 
> > +- Use C11 atomic semantics in mbuf, eventdev, eal interrupts
> > +- CPU frequency calculation using generic counter for Arm platforms
> > +- LPM library integration with RCU library
> 
> I would word it in reverse order: isn't it the RCU lib which is integrated in LPM?
I guess it is more about which library was created first. I will reverse the order.

> 
> > +- Change IO barriers to align with other-multi-copy atomicity memory
> model for Armv8-a
> 
> I don't understand "other-multi-copy atomicity".
There were few references provided in the patch. They are at [1], [2] and [3]. But, I guess it is not clear what this work item means exactly. I can change it as follows:

"Change IO barriers to use 'DMB' instruction for Armv8-a"

The patch itself is trivial. But, it is a basic change affecting all the drivers for Arm platforms. So, I would like to call out everyone's attention.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22ec71615d824f4f11d38d0e55a88d8956b7e45f
[2] https://www.youtube.com/watch?v=i6DayghhA8Q
[3] https://www.cl.cam.ac.uk/~pes20/armv8-mca/

> 

Re: [dpdk-web] [PATCH] update Arm roadmap for 20.08

[Thomas Monjalon]

Thanks for the replies.
Feel free to send a v2 that I can merge.


09/06/2020 17:54, Honnappa Nagarahalli:
> Thanks Thomas for your comments.
> 
> > -----Original Message-----
> > From: Thomas Monjalon <thomas@monjalon.net>
> > Sent: Tuesday, June 9, 2020 3:08 AM
> > To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> > Cc: web@dpdk.org; nd <nd@arm.com>
> > Subject: Re: [PATCH] update Arm roadmap for 20.08
> > 
> > 09/06/2020 05:28, Honnappa Nagarahalli:
> > > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > 
> > Additional explanation:
> > Was announced in the dpdk-dev mailing list:
> > http://mails.dpdk.org/archives/dev/2020-June/169542.html
> > 
> > > +- Bit operations APIs for PMDs
> > > +- rte_atomic API deprecation with-in DPDK
> > 
> > Deprecation is not a feature to coordinate in the roadmap I think.
> Ok, no problem. I just wanted to make sure that the community is on-board in reviewing the patch and making decisions. I guess the proposal on the mailing list is enough for that?
> 
> > 
> > > +- Use C11 atomic semantics in mbuf, eventdev, eal interrupts
> > > +- CPU frequency calculation using generic counter for Arm platforms
> > > +- LPM library integration with RCU library
> > 
> > I would word it in reverse order: isn't it the RCU lib which is integrated in LPM?
> I guess it is more about which library was created first. I will reverse the order.
> 
> > 
> > > +- Change IO barriers to align with other-multi-copy atomicity memory
> > model for Armv8-a
> > 
> > I don't understand "other-multi-copy atomicity".
> There were few references provided in the patch. They are at [1], [2] and [3]. But, I guess it is not clear what this work item means exactly. I can change it as follows:
> 
> "Change IO barriers to use 'DMB' instruction for Armv8-a"
> 
> The patch itself is trivial. But, it is a basic change affecting all the drivers for Arm platforms. So, I would like to call out everyone's attention.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=22ec71615d824f4f11d38d0e55a88d8956b7e45f
> [2] https://www.youtube.com/watch?v=i6DayghhA8Q
> [3] https://www.cl.cam.ac.uk/~pes20/armv8-mca/
> 
> > 
> 
>