On Fri, 7 Jun 2024 00:51:15 +0000 Mina Almasry wrote:
Abstrace the memory type from the page_pool so we can later add support for new memory types. Convert the page_pool to use the new netmem type abstraction, rather than use struct page directly.
As of this patch the netmem type is a no-op abstraction: it's always a struct page underneath. All the page pool internals are converted to use struct netmem instead of struct page, and the page pool now exports 2 APIs:
- The existing struct page API.
- The new struct netmem API.
Keeping the existing API is transitional; we do not want to refactor all the current drivers using the page pool at once.
The netmem abstraction is currently a no-op. The page_pool uses page_to_netmem() to convert allocated pages to netmem, and uses netmem_to_page() to convert the netmem back to pages to pass to mm APIs,
Follow up patches to this series add non-paged netmem support to the page_pool. This change is factored out on its own to limit the code churn to this 1 patch, for ease of code review.
Sorry for lack of meaningful review, busy times, in the meantime:
drivers/net/ethernet/renesas/ravb_main.c:306:16: error: incompatible integer to pointer conversion assigning to 'struct page *' from 'netmem_ref' (aka 'unsigned long') [-Wint-conversion] 306 | rx_buff->page = page_pool_alloc(priv->rx_pool[q], &rx_buff->offset, | ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 307 | &size, gfp_mask); | ~~~~~~~~~~~~~~~~