[PATCH rfc v3 0/4] add frag page support in page pool

This patchset adds frag page support in page pool and
enable skb's page frag recycling based on page pool in
hns3 drvier.

RFC v3:
1. Implement the semantic of "page recycling only wait for the
   page pool user instead of all user of a page" 
2. Support the frag allocation of different sizes
3. Merge patch 4 & 5 to one patch as it does not make sense to
   use page_pool_dev_alloc_pages() API directly with elevated
   refcnt.
4. other minor comment suggested by Alexander.

RFC v2:
1. Split patch 1 to more reviewable one.
2. Repurpose the lower 12 bits of the dma address to store the
   pagecnt_bias as suggested by Alexander.
3. support recycling to pool->alloc for elevated refcnt case
   too.


Yunsheng Lin (4):
  page_pool: keep pp info as long as page pool owns the page
  page_pool: add interface for getting and setting pagecnt_bias
  page_pool: add frag page recycling support in page pool
  net: hns3: support skb's frag page recycling based on page pool

 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |  79 ++++++++++++-
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.h |   3 +
 drivers/net/ethernet/marvell/mvneta.c           |   6 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c |   2 +-
 drivers/net/ethernet/ti/cpsw.c                  |   2 +-
 drivers/net/ethernet/ti/cpsw_new.c              |   2 +-
 include/linux/skbuff.h                          |   4 +-
 include/net/page_pool.h                         |  58 +++++++--
 net/core/page_pool.c                            | 150 +++++++++++++++++++++---
 9 files changed, 262 insertions(+), 44 deletions(-)

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2.7.4