netdev - [PATCH net-next v2 0/3] net: dev: PREEMPT

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Message-Id: <20220204201259.1095226-1-bigeasy@linutronix.de>
Date:   Fri,  4 Feb 2022 21:12:56 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Toke Høiland-Jørgensen <toke@...e.dk>
Subject: [PATCH net-next v2 0/3] net: dev: PREEMPT_RT fixups.

Hi,

this series removes or replaces preempt_disable() and local_irq_save()
sections which are problematic on PREEMPT_RT.
Patch 2 makes netif_rx() work from any context after I found suggestions
for it in an old thread. Should that work, then the context-specific
variants could be removed.

Already sketched the removal at
   https://git.kernel.org/pub/scm/linux/kernel/git/bigeasy/staging.git/log/?h=nettree


v1…v2:
  - #1 and #2
    - merge patch 1 und 2 from the series (as per Toke).
    - updated patch description and corrected the first commit number (as
      per Eric).
   - #2
     - Provide netif_rx() as in v1 and additionally __netif_rx() without
       local_bh disable()+enable() for the loopback driver. __netif_rx() is
       not exported (loopback is built-in only) so it won't be used
       drivers. If this doesn't work then we can still export/ define a
       wrapper as Eric suggested.
     - Added a comment that netif_rx() considered legacy.
   - #3
     - Moved ____napi_schedule() into rps_ipi_queued() and
       renamed it napi_schedule_rps().

v1:
   https://lore.kernel.org/all/20220202122848.647635-1-bigeasy@linutronix.de

Sebastian