netdev - [PATCH net-next v4 0/4] skbuff: Optimize SKB coalescing for page pool

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Message-Id: <20231129031201.32014-1-liangchen.linux@gmail.com>
Date: Wed, 29 Nov 2023 11:11:57 +0800
From: Liang Chen <liangchen.linux@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com
Cc: netdev@...r.kernel.org,
	linux-mm@...ck.org,
	liangchen.linux@...il.com
Subject: [PATCH net-next v4 0/4] skbuff: Optimize SKB coalescing for page pool

The combination of the following condition was excluded from skb coalescing:

from->pp_recycle = 1
from->cloned = 1
to->pp_recycle = 1

With page pool in use, this combination can be quite common(ex.
NetworkMananger may lead to the additional packet_type being registered,
thus the cloning). In scenarios with a higher number of small packets, it
can significantly affect the success rate of coalescing.

This patchset aims to optimize this scenario and enable coalescing of this
particular combination. That also involves supporting multiple users
referencing the same fragment of a pp page to accomondate the need to
increment the "from" SKB page's pp page reference count.

Changes from v2:
- use page_pool_unref_page instead of page_pool_deref_page
- leave pp page checking logic in skbuff.c

Liang Chen (4):
  page_pool: Rename pp_frag_count to pp_ref_count
  page_pool: halve BIAS_MAX for multiple user references of a fragment
  skbuff: Add a function to check if a page belongs to page_pool
  skbuff: Optimization of SKB coalescing for page pool

 .../net/ethernet/mellanox/mlx5/core/en_rx.c   |  4 +-
 include/linux/mm_types.h                      |  2 +-
 include/net/page_pool/helpers.h               | 45 +++++++++--------
 include/net/page_pool/types.h                 |  2 +-
 net/core/page_pool.c                          | 14 +++---
 net/core/skbuff.c                             | 48 ++++++++++++++-----
 6 files changed, 71 insertions(+), 44 deletions(-)

-- 
2.31.1