netdev - [PATCH v2 net-next 0/7] Avoid local_irq_save() and use napi_alloc

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Message-Id: <20190607192040.19367-1-bigeasy@linutronix.de>
Date:   Fri,  7 Jun 2019 21:20:33 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     netdev@...r.kernel.org
Cc:     tglx@...utronix.de, "David S. Miller" <davem@...emloft.net>
Subject: [PATCH v2 net-next 0/7] Avoid local_irq_save() and use napi_alloc_frag() where possible

The first two patches remove local_irq_save() around
`netdev_alloc_cache' which does not work on -RT. Besides helping -RT it
whould benefit the users of the function since they can avoid disabling
interrupts and save a few cycles.
The remaining patches are from a time when I tried to remove
`netdev_alloc_cache' but then noticed that we still have non-NAPI
drivers using netdev_alloc_skb() and I dropped that idea. Using
napi_alloc_frag() over netdev_alloc_frag() would skip the not required
local_bh_disable() around the allocation.

v1…v2:
  - 1/7 + 2/7 use now "(in_irq() || irqs_disabled())" instead just
    "irqs_disabled()" to align with __dev_kfree_skb_any(). Pointed out
    by Eric Dumazet.

  - 6/7 has a typo less. Pointed out by Sergei Shtylyov.

  - 3/7 + 4/7 added acks from Ioana Radulescu.

Sebastian