Re: [RFC PATCH net-next v4 1/2] net: introduce abstraction for network memory

[Shakeel Butt]

On Tue, Jan 2, 2024 at 1:27 PM Mina Almasry <almasrymina@xxxxxxxxxx> 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@xxxxxxxxxx/
>
> Signed-off-by: Mina Almasry <almasrymina@xxxxxxxxxx>
>

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 <shakeelb@xxxxxxxxxx>