netdev - [RFC v3 16/18] netmem: introduce a netmem API, virt_to_head

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Message-Id: <20250529031047.7587-17-byungchul@sk.com>
Date: Thu, 29 May 2025 12:10:45 +0900
From: Byungchul Park <byungchul@...com>
To: willy@...radead.org,
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Subject: [RFC v3 16/18] netmem: introduce a netmem API, virt_to_head_netmem()

To eliminate the use of struct page in page pool, the page pool code
should use netmem descriptor and APIs instead.

As part of the work, introduce a netmem API to convert a virtual address
to a head netmem allowing the code to use it rather than the existing
API, virt_to_head_page() for struct page.

Signed-off-by: Byungchul Park <byungchul@...com>
---
 include/net/netmem.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/net/netmem.h b/include/net/netmem.h
index ef639b5c70ec..f05a8b008d00 100644
--- a/include/net/netmem.h
+++ b/include/net/netmem.h
@@ -270,6 +270,13 @@ static inline netmem_ref netmem_compound_head(netmem_ref netmem)
 	return page_to_netmem(compound_head(netmem_to_page(netmem)));
 }
 
+static inline netmem_ref virt_to_head_netmem(const void *x)
+{
+	netmem_ref netmem = virt_to_netmem(x);
+
+	return netmem_compound_head(netmem);
+}
+
 /**
  * __netmem_address - unsafely get pointer to the memory backing @netmem
  * @netmem: netmem reference to get the pointer for
-- 
2.17.1