[RFC PATCH net-next v1 0/4] Abstract page from net stack

[Mina Almasry]

Currently these components in the net stack use the struct page
directly:

1. Drivers.
2. Page pool.
3. skb_frag_t.

To add support for new (non struct page) memory types to the net stack, we
must first abstract the current memory type.

Originally the plan was to reuse struct page* for the new memory types,
and to set the LSB on the page* to indicate it's not really a page.
However, for safe compiler type checking we need to introduce a new type.

struct netmem is introduced to abstract the underlying memory type.
Currently it's a no-op abstraction that is always a struct page underneath.
In parallel there is an undergoing effort to add support for devmem to the
net stack:

https://lore.kernel.org/netdev/20231208005250.2910004-1-almasrymina@xxxxxxxxxx/

Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Yunsheng Lin <linyunsheng@xxxxxxxxxx>
Cc: Willem de Bruijn <willemdebruijn.kernel@xxxxxxxxx>

Mina Almasry (4):
  vsock/virtio: use skb_frag_page() helper
  net: introduce abstraction for network memory
  net: add netmem_t to skb_frag_t
  net: page_pool: use netmem_t instead of struct page in API

 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 15 ++--
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c |  8 ++-
 drivers/net/ethernet/engleder/tsnep_main.c    | 22 +++---
 drivers/net/ethernet/freescale/fec_main.c     | 33 ++++++---
 .../net/ethernet/hisilicon/hns3/hns3_enet.c   | 14 ++--
 drivers/net/ethernet/intel/idpf/idpf_txrx.c   |  2 +-
 drivers/net/ethernet/intel/idpf/idpf_txrx.h   | 15 ++--
 drivers/net/ethernet/marvell/mvneta.c         | 24 ++++---
 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 18 +++--
 .../marvell/octeontx2/nic/otx2_common.c       |  8 ++-
 drivers/net/ethernet/mediatek/mtk_eth_soc.c   | 22 +++---
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  | 27 ++++---
 .../net/ethernet/mellanox/mlx5/core/en_rx.c   | 28 ++++----
 .../ethernet/microchip/lan966x/lan966x_fdma.c | 16 +++--
 drivers/net/ethernet/microsoft/mana/mana_en.c | 10 +--
 drivers/net/ethernet/socionext/netsec.c       | 25 ++++---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 48 ++++++++-----
 drivers/net/ethernet/ti/cpsw.c                | 11 +--
 drivers/net/ethernet/ti/cpsw_new.c            | 11 +--
 drivers/net/ethernet/ti/cpsw_priv.c           | 12 ++--
 drivers/net/ethernet/wangxun/libwx/wx_lib.c   | 18 +++--
 drivers/net/veth.c                            |  5 +-
 drivers/net/vmxnet3/vmxnet3_drv.c             |  7 +-
 drivers/net/vmxnet3/vmxnet3_xdp.c             | 20 +++---
 drivers/net/wireless/mediatek/mt76/dma.c      |  4 +-
 drivers/net/wireless/mediatek/mt76/mt76.h     |  5 +-
 .../net/wireless/mediatek/mt76/mt7915/mmio.c  |  4 +-
 drivers/net/xen-netfront.c                    |  4 +-
 include/linux/skbuff.h                        | 11 ++-
 include/net/netmem.h                          | 35 +++++++++
 include/net/page_pool/helpers.h               | 72 ++++++++++---------
 include/net/page_pool/types.h                 |  9 +--
 net/bpf/test_run.c                            |  2 +-
 net/core/page_pool.c                          | 39 +++++-----
 net/core/skbuff.c                             |  2 +-
 net/core/xdp.c                                |  3 +-
 net/kcm/kcmsock.c                             |  9 ++-
 net/vmw_vsock/virtio_transport.c              |  2 +-
 38 files changed, 381 insertions(+), 239 deletions(-)
 create mode 100644 include/net/netmem.h

-- 
2.43.0.472.g3155946c3a-goog