[PATCH v2 net-next 3/4] net: introduce common dev_page_is_reserved()

@@ -2800,12 +2800,6 @@ static void hns3_nic_alloc_rx_buffers(struct hns3_enet_ring *ring,
 	writel(i, ring->tqp->io_base + HNS3_RING_RX_RING_HEAD_REG);
 }
 
-static bool hns3_page_is_reusable(struct page *page)
-{
-	return page_to_nid(page) == numa_mem_id() &&
-		!page_is_pfmemalloc(page);
-}
-
 static bool hns3_can_reuse_page(struct hns3_desc_cb *cb)
 {
 	return (page_count(cb->priv) - cb->pagecnt_bias) == 1;

@@ -2826,7 +2820,7 @@ static void hns3_nic_reuse_page(struct sk_buff *skb, int i,
 	/* Avoid re-using remote pages, or the stack is still using the page
 	 * when page_offset rollback to zero, flag default unreuse
 	 */
-	if (unlikely(!hns3_page_is_reusable(desc_cb->priv)) ||
+	if (unlikely(dev_page_is_reserved(desc_cb->priv)) ||
 	    (!desc_cb->page_offset && !hns3_can_reuse_page(desc_cb))) {
 		__page_frag_cache_drain(desc_cb->priv, desc_cb->pagecnt_bias);
 		return;

@@ -3084,7 +3078,7 @@ static int hns3_alloc_skb(struct hns3_enet_ring *ring, unsigned int length,
 		memcpy(__skb_put(skb, length), va, ALIGN(length, sizeof(long)));
 
 		/* We can reuse buffer as-is, just make sure it is local */
-		if (likely(hns3_page_is_reusable(desc_cb->priv)))
+		if (likely(!dev_page_is_reserved(desc_cb->priv)))
 			desc_cb->reuse_flag = 1;
 		else /* This page cannot be reused so discard it */
 			__page_frag_cache_drain(desc_cb->priv,

@@ -194,17 +194,12 @@ static void fm10k_reuse_rx_page(struct fm10k_ring *rx_ring,
 					 DMA_FROM_DEVICE);
 }
 
-static inline bool fm10k_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
 				    struct page *page,
 				    unsigned int __maybe_unused truesize)
 {
 	/* avoid re-using remote pages */
-	if (unlikely(fm10k_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -266,7 +261,7 @@ static bool fm10k_add_rx_frag(struct fm10k_rx_buffer *rx_buffer,
 		memcpy(__skb_put(skb, size), va, ALIGN(size, sizeof(long)));
 
 		/* page is not reserved, we can reuse buffer as-is */
-		if (likely(!fm10k_page_is_reserved(page)))
+		if (likely(!dev_page_is_reserved(page)))
 			return true;
 
 		/* this page cannot be reused so discard it */

@@ -1843,19 +1843,6 @@ static bool i40e_cleanup_headers(struct i40e_ring *rx_ring, struct sk_buff *skb,
 	return false;
 }
 
-/**
- * i40e_page_is_reusable - check if any reuse is possible
- * @page: page struct to check
- *
- * A page is not reusable if it was allocated under low memory
- * conditions, or it's not in the same NUMA node as this CPU.
- */
-static inline bool i40e_page_is_reusable(struct page *page)
-{
-	return (page_to_nid(page) == numa_mem_id()) &&
-		!page_is_pfmemalloc(page);
-}
-
 /**
  * i40e_can_reuse_rx_page - Determine if this page can be reused by
  * the adapter for another receive

@@ -1891,7 +1878,7 @@ static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer,
 	struct page *page = rx_buffer->page;
 
 	/* Is any reuse possible? */
-	if (unlikely(!i40e_page_is_reusable(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -1141,19 +1141,6 @@ static void iavf_reuse_rx_page(struct iavf_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-/**
- * iavf_page_is_reusable - check if any reuse is possible
- * @page: page struct to check
- *
- * A page is not reusable if it was allocated under low memory
- * conditions, or it's not in the same NUMA node as this CPU.
- */
-static inline bool iavf_page_is_reusable(struct page *page)
-{
-	return (page_to_nid(page) == numa_mem_id()) &&
-		!page_is_pfmemalloc(page);
-}
-
 /**
  * iavf_can_reuse_rx_page - Determine if this page can be reused by
  * the adapter for another receive

@@ -1187,7 +1174,7 @@ static bool iavf_can_reuse_rx_page(struct iavf_rx_buffer *rx_buffer)
 	struct page *page = rx_buffer->page;
 
 	/* Is any reuse possible? */
-	if (unlikely(!iavf_page_is_reusable(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -728,15 +728,6 @@ bool ice_alloc_rx_bufs(struct ice_ring *rx_ring, u16 cleaned_count)
 	return !!cleaned_count;
 }
 
-/**
- * ice_page_is_reserved - check if reuse is possible
- * @page: page struct to check
- */
-static bool ice_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 /**
  * ice_rx_buf_adjust_pg_offset - Prepare Rx buffer for reuse
  * @rx_buf: Rx buffer to adjust

@@ -776,7 +767,7 @@ ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf, int rx_buf_pgcnt)
 	struct page *page = rx_buf->page;
 
 	/* avoid re-using remote pages */
-	if (unlikely(ice_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -8215,18 +8215,13 @@ static void igb_reuse_rx_page(struct igb_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool igb_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 static bool igb_can_reuse_rx_page(struct igb_rx_buffer *rx_buffer)
 {
 	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
 	struct page *page = rx_buffer->page;
 
 	/* avoid re-using remote pages */
-	if (unlikely(igb_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -1648,18 +1648,13 @@ static void igc_reuse_rx_page(struct igc_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool igc_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 static bool igc_can_reuse_rx_page(struct igc_rx_buffer *rx_buffer)
 {
 	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
 	struct page *page = rx_buffer->page;
 
 	/* avoid re-using remote pages */
-	if (unlikely(igc_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -1940,11 +1940,6 @@ static void ixgbe_reuse_rx_page(struct ixgbe_ring *rx_ring,
 	new_buff->pagecnt_bias	= old_buff->pagecnt_bias;
 }
 
-static inline bool ixgbe_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 static bool ixgbe_can_reuse_rx_page(struct ixgbe_rx_buffer *rx_buffer,
 				    int rx_buffer_pgcnt)
 {

@@ -1952,7 +1947,7 @@ static bool ixgbe_can_reuse_rx_page(struct ixgbe_rx_buffer *rx_buffer,
 	struct page *page = rx_buffer->page;
 
 	/* avoid re-using remote pages */
-	if (unlikely(ixgbe_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -781,18 +781,13 @@ static void ixgbevf_reuse_rx_page(struct ixgbevf_ring *rx_ring,
 	new_buff->pagecnt_bias = old_buff->pagecnt_bias;
 }
 
-static inline bool ixgbevf_page_is_reserved(struct page *page)
-{
-	return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
-}
-
 static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer)
 {
 	unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
 	struct page *page = rx_buffer->page;
 
 	/* avoid re-using remote pages */
-	if (unlikely(ixgbevf_page_is_reserved(page)))
+	if (unlikely(dev_page_is_reserved(page)))
 		return false;
 
 #if (PAGE_SIZE < 8192)

@@ -212,11 +212,6 @@ static inline u32 mlx5e_decompress_cqes_start(struct mlx5e_rq *rq,
 	return mlx5e_decompress_cqes_cont(rq, wq, 1, budget_rem) - 1;
 }
 
-static inline bool mlx5e_page_is_reserved(struct page *page)
-{
-	return page_is_pfmemalloc(page) || page_to_nid(page) != numa_mem_id();
-}
-
 static inline bool mlx5e_rx_cache_put(struct mlx5e_rq *rq,
 				      struct mlx5e_dma_info *dma_info)
 {

@@ -229,7 +224,7 @@ static inline bool mlx5e_rx_cache_put(struct mlx5e_rq *rq,
 		return false;
 	}
 
-	if (unlikely(mlx5e_page_is_reserved(dma_info->page))) {
+	if (unlikely(dev_page_is_reserved(dma_info->page))) {
 		stats->cache_waive++;
 		return false;
 	}

@@ -2938,6 +2938,21 @@ static inline struct page *dev_alloc_page(void)
 	return dev_alloc_pages(0);
 }
 
+/**
+ * dev_page_is_reserved - check whether a page can be reused for network Rx
+ * @page: the page to test
+ *
+ * A page shouldn't be considered for reusing/recycling if it was allocated
+ * under memory pressure or at a distant memory node.
+ *
+ * Returns true if this page should be returned to page allocator, false
+ * otherwise.
+ */
+static inline bool dev_page_is_reserved(const struct page *page)
+{
+	return page_is_pfmemalloc(page) || page_to_nid(page) != numa_mem_id();
+}
+
 /**
  *	skb_propagate_pfmemalloc - Propagate pfmemalloc if skb is allocated after RX page
  *	@page: The page that was allocated from skb_alloc_page