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net: page_pool: add memory provider helpers

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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: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David Wei <dw@davidwei.uk>
Link: https://patch.msgid.link/20250204215622.695511-10-dw@davidwei.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavel Begunkov
2025-02-04 13:56:20 -08:00
committed by Jakub Kicinski
parent 69e39537b6
commit 56102c013f
2 changed files with 47 additions and 0 deletions
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19
include/net/page_pool/memory_provider.h
View File

@@ -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

28
net/core/page_pool.c
View File

@@ -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);
}