Commit 56102c01 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jakub Kicinski
Browse files

net: page_pool: add memory provider helpers 



Add helpers for memory providers to interact with page pools.
net_mp_niov_{set,clear}_page_pool() serve to [dis]associate a net_iov
with a page pool. If used, the memory provider is responsible to match
"set" calls with "clear" once a net_iov is not going to be used by a page
pool anymore, changing a page pool, etc.

Acked-by: default avatarJakub Kicinski <kuba@kernel.org>
Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarDavid Wei <dw@davidwei.uk>
Link: https://patch.msgid.link/20250204215622.695511-10-dw@davidwei.uk


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 69e39537

include/net/page_pool/memory_provider.h

+19 −0
Original line number Diff line number Diff line
@@ -18,4 +18,23 @@ struct memory_provider_ops { 
	void (*uninstall)(void *mp_priv, struct netdev_rx_queue *rxq);

};



bool net_mp_niov_set_dma_addr(struct net_iov *niov, dma_addr_t addr);

void net_mp_niov_set_page_pool(struct page_pool *pool, struct net_iov *niov);

void net_mp_niov_clear_page_pool(struct net_iov *niov);



/**

  * net_mp_netmem_place_in_cache() - give a netmem to a page pool

  * @pool:      the page pool to place the netmem into

  * @netmem:    netmem to give

  *

  * Push an accounted netmem into the page pool's allocation cache. The caller

  * must ensure that there is space in the cache. It should only be called off

  * the mp_ops->alloc_netmems() path.

  */

static inline void net_mp_netmem_place_in_cache(struct page_pool *pool,

						netmem_ref netmem)

{

	pool->alloc.cache[pool->alloc.count++] = netmem;

}



#endif

net/core/page_pool.c

+28 −0
Original line number Diff line number Diff line
@@ -1197,3 +1197,31 @@ void page_pool_update_nid(struct page_pool *pool, int new_nid) 
	}

}

EXPORT_SYMBOL(page_pool_update_nid);



bool net_mp_niov_set_dma_addr(struct net_iov *niov, dma_addr_t addr)

{

	return page_pool_set_dma_addr_netmem(net_iov_to_netmem(niov), addr);

}



/* Associate a niov with a page pool. Should follow with a matching

 * net_mp_niov_clear_page_pool()

 */

void net_mp_niov_set_page_pool(struct page_pool *pool, struct net_iov *niov)

{

	netmem_ref netmem = net_iov_to_netmem(niov);



	page_pool_set_pp_info(pool, netmem);



	pool->pages_state_hold_cnt++;

	trace_page_pool_state_hold(pool, netmem, pool->pages_state_hold_cnt);

}



/* Disassociate a niov from a page pool. Should only be used in the

 * ->release_netmem() path.

 */

void net_mp_niov_clear_page_pool(struct net_iov *niov)

{

	netmem_ref netmem = net_iov_to_netmem(niov);



	page_pool_clear_pp_info(netmem);

}