[PATCH rfc v5 0/4] add frag page support in page pool

From: Yunsheng Lin
Date: Wed Jul 14 2021 - 05:35:32 EST


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

RFC v5:
1. Rename dma_addr[0] to pp_frag_count and adjust codes
according to the rename.

RFC v4:
1. Use the dma_addr[1] to store bias.
2. Default to a pagecnt_bias of PAGE_SIZE - 1.
3. other minor comment suggested by Alexander.

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 to manipulate frag count in page pool
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 | 82 +++++++++++++-
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/mm_types.h | 8 +-
include/linux/skbuff.h | 4 +-
include/net/page_pool.h | 83 +++++++++++---
net/core/page_pool.c | 140 +++++++++++++++++++++---
10 files changed, 283 insertions(+), 49 deletions(-)

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2.7.4