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xdp: page_pool related fix to cpumap

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When converting an xdp_frame into an SKB, and sending this into the network
stack, then the underlying XDP memory model need to release associated
resources, because the network stack don't have callbacks for XDP memory
models.  The only memory model that needs this is page_pool, when a driver
use the DMA-mapping feature.

Introduce page_pool_release_page(), which basically does the same as
page_pool_unmap_page(). Add xdp_release_frame() as the XDP memory model
interface for calling it, if the memory model match MEM_TYPE_PAGE_POOL, to
save the function call overhead for others. Have cpumap call
xdp_release_frame() before xdp_scrub_frame().

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
2019-06-18 15:05:27 +02:00
committed by David S. Miller
parent 516a7593fd
commit 6bf071bf09
4 changed files with 47 additions and 1 deletions
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15
net/core/xdp.c
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@@ -381,6 +381,21 @@ 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);
int xdp_attachment_query(struct xdp_attachment_info *info,
struct netdev_bpf *bpf)
{