Re: [dpdk-dev] [PATCH] mbuf: extend pktmbuf pool private structure

[Shahaf Shuler <shahafs@mellanox.com>]

Monday, November 18, 2019 6:12 PM, Stephen Hemminger:
> Subject: Re: [dpdk-dev] [PATCH] mbuf: extend pktmbuf pool private
> structure
> 
> On Mon, 18 Nov 2019 10:02:55 +0000
> Shahaf Shuler <shahafs@mellanox.com> wrote:
> 
> > With the API and ABI freeze ahead, it will be good to reserve some
> > bits on the private structure for future use.
> >
> > Otherwise we will potentially need to maintain two different private
> > structure during 2020 period.
> >
> > There is already one use case for those reserved bits[1]
> >
> > The reserved field should be set to 0 by the user.
> >
> > [1]
> >
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
> >
> hes.dpdk.org%2Fpatch%2F63077%2F&amp;data=02%7C01%7Cshahafs%40m
> ellanox.
> >
> com%7C261be5d5bd344538663c08d76c420fcb%7Ca652971c7d2e4d9ba6a4d14
> 9256f4
> >
> 61b%7C0%7C0%7C637096903295807188&amp;sdata=ruzHICpeUCNXbw4XXD
> Xj1ZOP35Z
> > ZoUtgWbSPHYSKDFo%3D&amp;reserved=0
> >
> > Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
> > ---
> 
> Understand the motivation but in my experience until you know what it is
> for, this doesn't work. And it creates lots of dead ends.

See cross reference [1]. I already have use case for it and understand how it is going to be used.
This is exactly why I am pushing this patch for 19.11. 

> 
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wi
> kipedia.org%2Fwiki%2FYou_aren%2527t_gonna_need_it&amp;data=02%7C0
> 1%7Cshahafs%40mellanox.com%7C261be5d5bd344538663c08d76c420fcb%7C
> a652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C637096903295807188&a
> mp;sdata=U8wYu7M85a9F%2BrGxaaxpOce6Pedh4THo4%2Fi03Sj2OV0%3D&
> amp;reserved=0