On 14/07/2023 05.53, Jakub Kicinski wrote:

On Thu, 13 Jul 2023 14:48:45 +0000 Haiyang Zhang wrote:

quoted

Add page pool for RX buffers for faster buffer cycle and reduce CPU
usage.

Get an extra ref count of a page after allocation, so after upper
layers put the page, it's still referenced by the pool. We can reuse
it as RX buffer without alloc a new page.

Please use the real page_pool API from include/net/page_pool.h
We've moved past every driver reinventing the wheel, sorry.

+1

Quoting[1]: Documentation/networking/page_pool.rst

  Basic use involves replacing alloc_pages() calls with the 
page_pool_alloc_pages() call.
  Drivers should use page_pool_dev_alloc_pages() replacing 
dev_alloc_pages().


[1] https://kernel.org/doc/html/latest/networking/page_pool.html