netdev - [PATCH net-next v3 0/7] net: lockless stop/wake combo macros

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Message-Id: <20230405223134.94665-1-kuba@kernel.org>
Date:   Wed,  5 Apr 2023 15:31:27 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        herbert@...dor.apana.org.au, alexander.duyck@...il.com,
        hkallweit1@...il.com, andrew@...n.ch, willemb@...gle.com,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v3 0/7] net: lockless stop/wake combo macros

A lot of drivers follow the same scheme to stop / start queues
without introducing locks between xmit and NAPI tx completions.
I'm guessing they all copy'n'paste each other's code.
The original code dates back all the way to e1000 and Linux 2.6.19.

v3:
 - render the info as part of documentation, maybe someone will
   notice and use it (patches 1, 2, 3 are new)
 - use the __after_atomic barrier
 - add last patch to avoid a barrier in the wake path
more detailed change logs in the patches.

v2: https://lore.kernel.org/all/20230401051221.3160913-2-kuba@kernel.org/
 - really flip the unlikely into a likely in __netif_tx_queue_maybe_wake()
 - convert if / else into pre-init of _ret
v1: https://lore.kernel.org/all/20230322233028.269410-1-kuba@kernel.org/
 - perdicate -> predicate
 - on race use start instead of wake and make a note of that
   in the doc / comment at the start
rfc: https://lore.kernel.org/all/20230311050130.115138-1-kuba@kernel.org/

Jakub Kicinski (7):
  docs: net: reformat driver.rst from a list to sections
  docs: net: move the probe and open/close sections of driver.rst up
  docs: net: use C syntax highlight in driver.rst
  net: provide macros for commonly copied lockless queue stop/wake code
  ixgbe: use new queue try_stop/try_wake macros
  bnxt: use new queue try_stop/try_wake macros
  net: piggy back on the memory barrier in bql when waking queues

 Documentation/networking/driver.rst           | 119 ++++++++-----
 drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  42 +----
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |  42 ++---
 include/linux/netdevice.h                     |   3 +-
 include/net/netdev_queues.h                   | 165 ++++++++++++++++++
 5 files changed, 264 insertions(+), 107 deletions(-)
 create mode 100644 include/net/netdev_queues.h

-- 
2.39.2