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

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 (5): 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 page recycling support based on elevated refcnt page_pool: support page frag API for 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 | 50 +++++-- net/core/page_pool.c | 172 ++++++++++++++++++++---- 9 files changed, 266 insertions(+), 54 deletions(-)