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
