linux-kernel - [PATCH net-next -v5 0/4] some optimization for page pool

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Date:   Sat, 9 Oct 2021 17:37:20 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, <akpm@...ux-foundation.org>,
        <hawk@...nel.org>, <ilias.apalodimas@...aro.org>,
        <peterz@...radead.org>, <yuzhao@...gle.com>, <jhubbard@...dia.com>,
        <will@...nel.org>, <willy@...radead.org>, <jgg@...pe.ca>,
        <mcroce@...rosoft.com>, <willemb@...gle.com>,
        <cong.wang@...edance.com>, <pabeni@...hat.com>,
        <haokexin@...il.com>, <nogikh@...gle.com>, <elver@...gle.com>,
        <memxor@...il.com>, <vvs@...tuozzo.com>, <linux-mm@...ck.org>,
        <edumazet@...gle.com>, <alexander.duyck@...il.com>,
        <dsahern@...il.com>
Subject: [PATCH net-next -v5 0/4] some optimization for page pool

Patch 1: disable dma mapping support for 32-bit arch with 64-bit
         DMA.
Patch 2 - 4: pp page frag tracking support

The small packet drop test show no notiable performance degradation
when page pool is disabled.

V5: Keep the put_page()/get_page() semantics.

V4:
    1. Change error code to EOPNOTSUPP in patch 1.
    2. Drop patch 2.
    3. Use pp_frag_count to indicate if a pp page can be tracked,
       to avoid breaking the mlx5 driver.

V3:
    1. add patch 1/4/6/7.
    2. use pp_magic to identify pp page uniquely too.
    3. avoid unnecessary compound_head() calling.

V2: add patch 2, adjust the commit log accroding to the discussion
    in V1, and fix a compiler error reported by kernel test robot.

Yunsheng Lin (4):
  page_pool: disable dma mapping support for 32-bit arch with 64-bit DMA
  page_pool: change BIAS_MAX to support incrementing
  mm: introduce __get_page() and __put_page()
  skbuff: keep track of pp page when pp_frag_count is used

 include/linux/mm.h       | 21 ++++++++++++++-------
 include/linux/mm_types.h | 13 +------------
 include/linux/skbuff.h   | 30 ++++++++++++++++++++----------
 include/net/page_pool.h  | 36 ++++++++++++++++++++++++------------
 mm/swap.c                |  6 +++---
 net/core/page_pool.c     | 29 +++++++++--------------------
 net/core/skbuff.c        | 10 ++++++++--
 7 files changed, 79 insertions(+), 66 deletions(-)

-- 
2.33.0