netdev - [PATCH v9 net-next 0/4] add multi-buff support for xdp running in generic mode

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Date: Mon, 12 Feb 2024 10:50:53 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
	kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	bpf@...r.kernel.org,
	toke@...hat.com,
	willemdebruijn.kernel@...il.com,
	jasowang@...hat.com,
	sdf@...gle.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com
Subject: [PATCH v9 net-next 0/4] add multi-buff support for xdp running in generic mode

Introduce multi-buffer support for xdp running in generic mode not always
linearizing the skb in netif_receive_generic_xdp routine.
Introduce generic percpu page_pools allocator.

Changes since v8:
- fix veth regression introduce in veth.sh selftest
Changes since v7:
- fix sparse warnings
Changes since v6:
- remove patch 4/5 'net: page_pool: make stats available just for global pools'
- rename netif_skb_segment_for_xdp() in
  skb_cow_data_for_xdp()/skb_pp_cow_data()
- rename net_page_pool_alloc() in net_page_pool_create()
- rename page_pool percpu pointer in system_page_pool
- set percpu page_pool memory size
Changes since v5:
- move percpu page_pool pointer out of softnet_data in a dedicated variable
- make page_pool stats available just for global pools
- rely on netif_skb_segment_for_xdp utility routine in veth driver
Changes since v4:
- fix compilation error if page_pools are not enabled
Changes since v3:
- introduce page_pool in softnet_data structure
- rely on page_pools for xdp_generic code
Changes since v2:
- rely on napi_alloc_frag() and napi_build_skb() to build the new skb
Changes since v1:
- explicitly keep the skb segmented in netif_skb_check_for_generic_xdp() and
  do not rely on pskb_expand_head()

Lorenzo Bianconi (4):
  net: add generic percpu page_pool allocator
  xdp: rely on skb pointer reference in do_xdp_generic and
    netif_receive_generic_xdp
  xdp: add multi-buff support for xdp running in generic mode
  veth: rely on skb_pp_cow_data utility routine

 drivers/net/tun.c             |   4 +-
 drivers/net/veth.c            |  74 +------------------
 include/linux/netdevice.h     |   2 +-
 include/linux/skbuff.h        |   4 ++
 include/net/page_pool/types.h |   3 +
 net/core/dev.c                | 131 +++++++++++++++++++++++++++-------
 net/core/page_pool.c          |  23 ++++--
 net/core/skbuff.c             |  97 ++++++++++++++++++++++++-
 8 files changed, 231 insertions(+), 107 deletions(-)

-- 
2.43.0