[net-next,v3,0/4] introduce page_pool_alloc() API

Message

Yunsheng Lin June 9, 2023, 1:17 p.m. UTC

In [1] & [2], there are usecases for veth and virtio_net to
use frag support in page pool to reduce memory usage, and it
may request different frag size depending on the head/tail
room space for xdp_frame/shinfo and mtu/packet size. When the
requested frag size is large enough that a single page can not
be split into more than one frag, using frag support only have
performance penalty because of the extra frag count handling
for frag support.

So this patchset provides a page pool API for the driver to
allocate memory with least memory utilization and performance
penalty when it doesn't know the size of memory it need
beforehand.

1. https://patchwork.kernel.org/project/netdevbpf/patch/[e-mail]/
2. https://patchwork.kernel.org/project/netdevbpf/patch/[e-mail]/

V3: Incorporate changes from the disscusion with Alexander,
    mostly the inline wraper, PAGE_POOL_DMA_USE_PP_FRAG_COUNT
    change split to separate patch and comment change.
V2: Add patch to remove PP_FLAG_PAGE_FRAG flags and mention
    virtio_net usecase in the cover letter.
V1: Drop RFC tag and page_pool_frag patch.

Yunsheng Lin (4):
  page_pool: frag API support for 32-bit arch with 64-bit DMA
  page_pool: unify frag_count handling in page_pool_is_last_frag()
  page_pool: introduce page_pool_alloc() API
  page_pool: remove PP_FLAG_PAGE_FRAG flag

 .../net/ethernet/hisilicon/hns3/hns3_enet.c   |   3 +-
 .../marvell/octeontx2/nic/otx2_common.c       |   2 +-
 .../net/ethernet/mellanox/mlx5/core/en_main.c |  11 +-
 drivers/net/wireless/mediatek/mt76/mac80211.c |   2 +-
 include/net/page_pool.h                       | 131 +++++++++++++++---
 net/core/page_pool.c                          |  26 ++--
 net/core/skbuff.c                             |   2 +-
 7 files changed, 139 insertions(+), 38 deletions(-)