Changes in v3: - Replaced the struct netmem union with an opaque netmem_ref type. - Added func docs to the netmem helpers and type. - Renamed the skb_frag_t fields since it's no longer a bio_vec ----------- Changes in v2: - Reverted changes to the page_pool. The page pool now retains the same API, so that we don't have to touch many existing drivers. The devmem TCP series will include the changes to the page pool. - Addressed comments. This series is a prerequisite to the devmem TCP series. For a full snapshot of the code which includes these changes, feel free to check: https://github.com/mina/linux/commits/tcpdevmem-rfcv5/ ----------- 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 (3): vsock/virtio: use skb_frag_*() helpers net: introduce abstraction for network memory net: add netmem_ref to skb_frag_t include/linux/skbuff.h | 92 ++++++++++++++++++++++---------- include/net/netmem.h | 41 ++++++++++++++ net/core/skbuff.c | 22 +++++--- net/kcm/kcmsock.c | 10 +++- net/vmw_vsock/virtio_transport.c | 6 +-- 5 files changed, 133 insertions(+), 38 deletions(-) create mode 100644 include/net/netmem.h -- 2.43.0.472.g3155946c3a-goog
