[PATCH net-next v3 2/8] xsk: support get page by addr

[Xuan Zhuo <xuanzhuo@linux.alibaba.com>]

xsk adds an interface and returns the page corresponding to
data. virtio-net does not initialize dma, so it needs page to construct
scatterlist to pass to vring.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
---
 include/net/xdp_sock_drv.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
index 4e295541e396..1d08b5d8d15f 100644
--- a/include/net/xdp_sock_drv.h
+++ b/include/net/xdp_sock_drv.h
@@ -72,6 +72,12 @@ static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
 	return xp_get_frame_dma(xskb);
 }
 
+static inline struct page *xsk_buff_xdp_get_page(struct xsk_buff_pool *pool, u64 addr)
+{
+	addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
+	return pool->umem->pgs[addr >> PAGE_SHIFT];
+}
+
 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
 {
 	return xp_alloc(pool);
@@ -207,6 +213,11 @@ static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
 	return 0;
 }
 
+static inline struct page *xsk_buff_xdp_get_page(struct xsk_buff_pool *pool, u64 addr)
+{
+	return NULL;
+}
+
 static inline struct xdp_buff *xsk_buff_alloc(struct xsk_buff_pool *pool)
 {
 	return NULL;
-- 
2.31.0