netdev - Re: [PATCH 2/6 bpf-next] Clean up xsk reuseq API

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Date:   Thu, 27 Jun 2019 19:31:26 -0700
From:   "Jonathan Lemon" <jonathan.lemon@...il.com>
To:     "Jakub Kicinski" <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com, saeedm@...lanox.com,
        maximmi@...lanox.com, brouer@...hat.com, kernel-team@...com
Subject: Re: [PATCH 2/6 bpf-next] Clean up xsk reuseq API



On 27 Jun 2019, at 15:38, Jakub Kicinski wrote:

> On Thu, 27 Jun 2019 15:08:32 -0700, Jonathan Lemon wrote:
>> The reuseq is actually a recycle stack, only accessed from the kernel 
>> side.
>> Also, the implementation details of the stack should belong to the 
>> umem
>> object, and not exposed to the caller.
>>
>> Clean up and rename for consistency in preparation for the next 
>> patch.
>>
>> Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
>
> Prepare/swap is to cater to how drivers should be written - being able
> to allocate resources independently of those currently used.  Allowing
> for changing ring sizes and counts on the fly.  This patch makes it
> harder to write drivers in the way we are encouraging people to.
>
> IOW no, please don't do this.

The main reason I rewrote this was to provide the same type
of functionality as realloc() - no need to allocate/initialize a new
array if the old one would still end up being used.  This would seem
to be a win for the typical case of having the interface go up/down.

Perhaps I should have named the function differently?
-- 
Jonathan