diff mbox series

[v3,02/26] netmem: Add utility functions

Message ID 20230111042214.907030-3-willy@infradead.org (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Split netmem from struct page | expand

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netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5339 this patch: 5339
netdev/cc_maintainers warning 4 maintainers not CCed: edumazet@google.com davem@davemloft.net pabeni@redhat.com kuba@kernel.org
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netdev/check_selftest success No net selftest shell script
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netdev/checkpatch fail CHECK: spaces preferred around that '*' (ctx:WxO) ERROR: spaces required around that ':' (ctx:OxW) WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
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Commit Message

Matthew Wilcox (Oracle) Jan. 11, 2023, 4:21 a.m. UTC 
netmem_page() is defined this way to preserve constness.  page_netmem()
doesn't call compound_head() because netmem users always use the head
page; it does include a debugging assert to check that it's true.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
---
 include/net/page_pool.h | 59 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
diff mbox series

Patch

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index cbea4df54918..414907e67ff6 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -96,6 +96,65 @@  NETMEM_MATCH(_refcount, _refcount);
 #undef NETMEM_MATCH
 static_assert(sizeof(struct netmem) <= sizeof(struct page));
 
+#define netmem_page(nmem) (_Generic((nmem),				\
+	const struct netmem *:	(const struct page *)nmem,		\
+	struct netmem *:	(struct page *)nmem))
+
+static inline struct netmem *page_netmem(struct page *page)
+{
+	VM_BUG_ON_PAGE(PageTail(page), page);
+	return (struct netmem *)page;
+}
+
+static inline unsigned long netmem_pfn(const struct netmem *nmem)
+{
+	return page_to_pfn(netmem_page(nmem));
+}
+
+static inline unsigned long netmem_nid(const struct netmem *nmem)
+{
+	return page_to_nid(netmem_page(nmem));
+}
+
+static inline struct netmem *virt_to_netmem(const void *x)
+{
+	return page_netmem(virt_to_head_page(x));
+}
+
+static inline void *netmem_to_virt(const struct netmem *nmem)
+{
+	return page_to_virt(netmem_page(nmem));
+}
+
+static inline void *netmem_address(const struct netmem *nmem)
+{
+	return page_address(netmem_page(nmem));
+}
+
+static inline int netmem_ref_count(const struct netmem *nmem)
+{
+	return page_ref_count(netmem_page(nmem));
+}
+
+static inline void netmem_get(struct netmem *nmem)
+{
+	struct folio *folio = (struct folio *)nmem;
+
+	folio_get(folio);
+}
+
+static inline void netmem_put(struct netmem *nmem)
+{
+	struct folio *folio = (struct folio *)nmem;
+
+	folio_put(folio);
+}
+
+static inline bool netmem_is_pfmemalloc(const struct netmem *nmem)
+{
+	return nmem->pp_magic & BIT(1);
+}
+
 /*
  * Fast allocation side cache array/stack
  *