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xdp: allow page_pool as an allocator type in xdp_return_frame

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New allocator type MEM_TYPE_PAGE_POOL for page_pool usage.

The registered allocator page_pool pointer is not available directly
from xdp_rxq_info, but it could be (if needed).  For now, the driver
should keep separate track of the page_pool pointer, which it should
use for RX-ring page allocation.

As suggested by Saeed, to maintain a symmetric API it is the drivers
responsibility to allocate/create and free/destroy the page_pool.
Thus, after the driver have called xdp_rxq_info_unreg(), it is drivers
responsibility to free the page_pool, but with a RCU free call.  This
is done easily via the page_pool helper page_pool_destroy() (which
avoids touching any driver code during the RCU callback, which could
happen after the driver have been unloaded).

V8: address issues found by kbuild test robot
 - Address sparse should be static warnings
 - Allow xdp.o to be compiled without page_pool.o

V9: Remove inline from .c file, compiler knows best

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2018-04-17 16:46:22 +02:00 • committed by David S. Miller
parent ff7d6b27f8
commit 57d0a1c1ac
3 changed files with 65 additions and 12 deletions
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14
include/net/page_pool.h
View file

@ -117,7 +117,12 @@ void __page_pool_put_page(struct page_pool *pool,
static inline void page_pool_put_page(struct page_pool *pool, struct page *page)
{
/* When page_pool isn't compiled-in, net/core/xdp.c doesn't
* allow registering MEM_TYPE_PAGE_POOL, but shield linker.
*/
#ifdef CONFIG_PAGE_POOL
__page_pool_put_page(pool, page, false);
#endif
}
/* Very limited use-cases allow recycle direct */
static inline void page_pool_recycle_direct(struct page_pool *pool,
@ -126,4 +131,13 @@ static inline void page_pool_recycle_direct(struct page_pool *pool,
__page_pool_put_page(pool, page, true);
}
static inline bool is_page_pool_compiled_in(void)
{
#ifdef CONFIG_PAGE_POOL
return true;
#else
return false;
#endif
}
#endif /* _NET_PAGE_POOL_H */