lkml.org 
[lkml]   [2017]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH net 3/3] net: mvpp2: do not call txq_done from the Tx path when Tx irqs are used
From
From: Antoine Tenart <antoine.tenart@free-electrons.com>
Date: Mon, 23 Oct 2017 15:24:31 +0200

> When Tx IRQs are used, txq_bufs_free() can be called from both the Tx
> path and from NAPI poll(). This led to CPU stalls as if these two tasks
> (Tx and Poll) are scheduled on two CPUs at the same time, DMA unmapping
> operations are done on the same txq buffers.
>
> This patch adds a check not to call txq_done() from the Tx path if Tx
> interrupts are used as it does not make sense to do so.
>
> Fixes: edc660fa09e2 ("net: mvpp2: replace TX coalescing interrupts with hrtimer")
> Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>

Applied.

\
 
 \ /
  Last update: 2017-10-24 11:37    [W:0.198 / U:0.188 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site