[net-next,-v5,0/4] some optimization for page pool

Message

Yunsheng Lin Oct. 9, 2021, 9:37 a.m. UTC

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(-)