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Date:   Wed, 13 Dec 2023 18:05:23 -0800
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Message-ID: <20231214020530.2267499-1-almasrymina@google.com>
Subject: [RFC PATCH net-next v1 0/4] Abstract page from net stack
From:   Mina Almasry <almasrymina@google.com>
To:     linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        bpf@vger.kernel.org
Cc:     Mina Almasry <almasrymina@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
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        "=?UTF-8?q?Christian=20K=C3=B6nig?=" <christian.koenig@amd.com>,
        Michael Chan <michael.chan@broadcom.com>,
        "David S. Miller" <davem@davemloft.net>,
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        John Fastabend <john.fastabend@gmail.com>,
        Wei Fang <wei.fang@nxp.com>,
        Shenwei Wang <shenwei.wang@nxp.com>,
        Clark Wang <xiaoning.wang@nxp.com>,
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        John Crispin <john@phrozen.org>,
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        Mark Lee <Mark-MC.Lee@mediatek.com>,
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        <angelogioacchino.delregno@collabora.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        Horatiu Vultur <horatiu.vultur@microchip.com>,
        UNGLinuxDriver@microchip.com,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Jassi Brar <jaswinder.singh@linaro.org>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>,
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        Jose Abreu <joabreu@synopsys.com>,
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        Siddharth Vadapalli <s-vadapalli@ti.com>,
        Ravi Gunasekaran <r-gunasekaran@ti.com>,
        Roger Quadros <rogerq@kernel.org>,
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        Mengyuan Lou <mengyuanlou@net-swift.com>,
        Ronak Doshi <doshir@vmware.com>,
        VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
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        Stefano Stabellini <sstabellini@kernel.org>,
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        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <martin.lau@linux.dev>,
        Song Liu <song@kernel.org>,
        Yonghong Song <yonghong.song@linux.dev>,
        KP Singh <kpsingh@kernel.org>,
        Stanislav Fomichev <sdf@google.com>,
        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
        Stefan Hajnoczi <stefanha@redhat.com>,
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        "=?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?=" <mic@digikod.net>,
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        Nick Desaulniers <ndesaulniers@google.com>,
        Bill Wendling <morbo@google.com>,
        Justin Stitt <justinstitt@google.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
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        Willem de Bruijn <willemdebruijn.kernel@gmail.com>
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Precedence: bulk

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@google.=
com/

Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Christian K=C3=B6nig <christian.koenig@amd.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Yunsheng Lin <linyunsheng@huawei.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>

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

--=20
2.43.0.472.g3155946c3a-goog