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page_pool: export page_pool_disable_direct_recycling()

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56ef27e3 unexported page_pool_unlink_napi() and renamed it to
page_pool_disable_direct_recycling(). This is because there was no
in-tree user of page_pool_unlink_napi().

Since then Rx queue API and an implementation in bnxt got merged. In the
bnxt implementation, it broadly follows the following steps: allocate
new queue memory + page pool, stop old rx queue, swap, then destroy old
queue memory + page pool.

The existing NAPI instance is re-used so when the old page pool that is
no longer used but still linked to this shared NAPI instance is
destroyed, it will trigger warnings.

In my initial patches I unlinked a page pool from a NAPI instance
directly. Instead, export page_pool_disable_direct_recycling() and call
that instead to avoid having a driver touch a core struct.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
David Wei 2024-06-26 20:01:59 -07:00 committed by Paolo Abeni
parent e2dd0d0593
commit d7f39aee79
2 changed files with 3 additions and 1 deletions
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1
include/net/page_pool/types.h
View File

@ -229,6 +229,7 @@ struct page_pool *page_pool_create_percpu(const struct page_pool_params *params,
struct xdp_mem_info;
#ifdef CONFIG_PAGE_POOL
void page_pool_disable_direct_recycling(struct page_pool *pool);
void page_pool_destroy(struct page_pool *pool);
void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
const struct xdp_mem_info *mem);

3
net/core/page_pool.c
View File

@ -1014,7 +1014,7 @@ void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *),
pool->xdp_mem_id = mem->id;
}
static void page_pool_disable_direct_recycling(struct page_pool *pool)
void page_pool_disable_direct_recycling(struct page_pool *pool)
{
/* Disable direct recycling based on pool->cpuid.
* Paired with READ_ONCE() in page_pool_napi_local().
@ -1032,6 +1032,7 @@ static void page_pool_disable_direct_recycling(struct page_pool *pool)
WRITE_ONCE(pool->p.napi, NULL);
}
EXPORT_SYMBOL(page_pool_disable_direct_recycling);
void page_pool_destroy(struct page_pool *pool)
{