On Tue, Jan 2, 2024 at 1:27 PM Mina Almasry [off-list ref] wrote:

Add the netmem_ref type, an abstraction for network memory.

To add support for new memory types to the net stack, we must first
abstract the current memory type. Currently parts of the net stack
use struct page directly:

- page_pool
- drivers
- skb_frag_t

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 compiler type checking we need to introduce a new type.

netmem_ref 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/ (local)

Signed-off-by: Mina Almasry <redacted>

I think you forgot to update the commit message to replace netmem_ref
with netmem. Also you can mention that you took the approach similar
to 'struct encoded_page'. Otherwise LGTM.

Reviewed-by: Shakeel Butt <redacted>