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List:       linux-mm
Subject:    [PATCH 23/24] net: Add support for netmem in skb_frag
From:       "Matthew Wilcox (Oracle)" <willy () infradead ! org>
Date:       2022-11-30 22:08:02
Message-ID: 20221130220803.3657490-24-willy () infradead ! org
[Download RAW message or body]

Allow drivers to add netmem to skbs & retrieve them again.  If the
VM_BUG_ON triggers, we can add a call to compound_head() either in
this function or in page_netmem().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/skbuff.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4e464a27adaf..dabfb392ca01 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3345,6 +3345,12 @@ static inline struct page *skb_frag_page(const skb_frag_t *frag)
 	return frag->bv_page;
 }
 
+static inline struct netmem *skb_frag_netmem(const skb_frag_t *frag)
+{
+	VM_BUG_ON_PAGE(PageTail(frag->bv_page), frag->bv_page);
+	return page_netmem(frag->bv_page);
+}
+
 /**
  * __skb_frag_ref - take an addition reference on a paged fragment.
  * @frag: the paged fragment
@@ -3453,6 +3459,11 @@ static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page)
 	frag->bv_page = page;
 }
 
+static inline void __skb_frag_set_netmem(skb_frag_t *frag, struct netmem *nmem)
+{
+	__skb_frag_set_page(frag, netmem_page(nmem));
+}
+
 /**
  * skb_frag_set_page - sets the page contained in a paged fragment of an skb
  * @skb: the buffer
-- 
2.35.1


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