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xdp: remove unused {__,}xdp_release_frame()

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__xdp_build_skb_from_frame() was the last user of
{__,}xdp_release_frame(), which detaches pages from the page_pool.
All the consumers now recycle Page Pool skbs and page, except mlx5,
stmmac and tsnep drivers, which use page_pool_release_page() directly
(might change one day). It's safe to assume this functionality is not
needed anymore and can be removed (in favor of recycling).

Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://lore.kernel.org/r/20230313215553.1045175-5-aleksander.lobakin@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexander Lobakin 2023-03-13 22:55:53 +01:00 committed by Alexei Starovoitov
parent 9c94bbf9a8
commit d4e492338d
2 changed files with 0 additions and 44 deletions
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29
include/net/xdp.h
View File

@ -317,35 +317,6 @@ void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq);
void xdp_return_frame_bulk(struct xdp_frame *xdpf,
struct xdp_frame_bulk *bq);
/* When sending xdp_frame into the network stack, then there is no
* return point callback, which is needed to release e.g. DMA-mapping
* resources with page_pool. Thus, have explicit function to release
* frame resources.
*/
void __xdp_release_frame(void *data, struct xdp_mem_info *mem);
static inline void xdp_release_frame(struct xdp_frame *xdpf)
{
struct xdp_mem_info *mem = &xdpf->mem;
struct skb_shared_info *sinfo;
int i;
/* Curr only page_pool needs this */
if (mem->type != MEM_TYPE_PAGE_POOL)
return;
if (likely(!xdp_frame_has_frags(xdpf)))
goto out;
sinfo = xdp_get_shared_info_from_frame(xdpf);
for (i = 0; i < sinfo->nr_frags; i++) {
struct page *page = skb_frag_page(&sinfo->frags[i]);
__xdp_release_frame(page_address(page), mem);
}
out:
__xdp_release_frame(xdpf->data, mem);
}
static __always_inline unsigned int xdp_get_frame_len(struct xdp_frame *xdpf)
{
struct skb_shared_info *sinfo;

15
net/core/xdp.c
View File

@ -531,21 +531,6 @@ void xdp_return_buff(struct xdp_buff *xdp)
}
EXPORT_SYMBOL_GPL(xdp_return_buff);
/* Only called for MEM_TYPE_PAGE_POOL see xdp.h */
void __xdp_release_frame(void *data, struct xdp_mem_info *mem)
{
struct xdp_mem_allocator *xa;
struct page *page;
rcu_read_lock();
xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
page = virt_to_head_page(data);
if (xa)
page_pool_release_page(xa->page_pool, page);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(__xdp_release_frame);
void xdp_attachment_setup(struct xdp_attachment_info *info,
struct netdev_bpf *bpf)
{