lkml.org 
[lkml]   [2019]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 10/10] Replace tasklets with workqueues
On Thu, Jul 25, 2019 at 04:36:20PM +0200, Maksym Planeta wrote:
> Is this one better?
>
> Replace tasklets with workqueues in rxe driver. The reason for this
> replacement is that tasklets are supposed to run atomically, although the
> actual code may block.
>
> Modify the SKB destructor for outgoing SKB's to schedule QP tasks only if
> the QP is not destroyed itself.
>
> Add a variable "pending_skb_down" to ensure that reference counting for a QP
> is decremented only when QP access related to this skb is over.
>
> Separate part of pool element cleanup code to allow this code to be called
> in the very end of cleanup, even if some of cleanup is scheduled for
> asynchronous execution. Example, when it was happening is destructor for a
> QP.
>
> Disallow calling of task functions "directly". This allows to simplify logic
> inside rxe_task.c
>
> Schedule rxe_qp_do_cleanup onto high-priority system workqueue, because this
> function can be scheduled from normal system workqueue.
>
> Before destroying a QP, wait until all references to this QP are gone.
> Previously the problem was that outgoing SKBs could be freed after the QP
> these SKBs refer to is destroyed.
>
> Add blocking rxe_run_task to replace __rxe_do_task that was calling task
> function directly.

Mostly but it would also be good to describe the use after free and
races more specifically

Jason

\
 
 \ /
  Last update: 2019-07-25 20:50    [W:0.091 / U:1.216 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site