[PATCH net-next] net: inline skb_add_rx_frag_netmem()

This critical helper (via skb_add_rx_frag()) is mostly used
from drivers rx fast path.

It is time to inline it, this actually saves space in vmlinux:

size vmlinux.old vmlinux
   text    data     bss     dec     hex filename
37350766        23092977        4846992 65290735        3e441ef vmlinux.old
37350600        23092977        4846992 65290569        3e44149 vmlinux

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 include/linux/skbuff.h | 13 +++++++++++--
 net/core/skbuff.c      | 11 -----------
 2 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index daa4e4944ce3f2184b193f43dbab88147ae2a7e4..9cc98f850f1d7cd01eed3fe9d17b59116b49958e 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h

@@ -2682,8 +2682,17 @@ static inline void skb_fill_page_desc_noacc(struct sk_buff *skb, int i,
 	shinfo->nr_frags = i + 1;
 }
 
-void skb_add_rx_frag_netmem(struct sk_buff *skb, int i, netmem_ref netmem,
-			    int off, int size, unsigned int truesize);
+static inline void skb_add_rx_frag_netmem(struct sk_buff *skb, int i,
+					  netmem_ref netmem, int off,
+					  int size, unsigned int truesize)
+{
+	DEBUG_NET_WARN_ON_ONCE(size > truesize);
+
+	skb_fill_netmem_desc(skb, i, netmem, off, size);
+	skb->len += size;
+	skb->data_len += size;
+	skb->truesize += truesize;
+}
 
 static inline void skb_add_rx_frag(struct sk_buff *skb, int i,
 				   struct page *page, int off, int size,

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index dc47d3efc72ed86dce5e382d505eda7bc863669a..e3aa1612ef5dce5b96deb17731d0449d79adc34f 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c

@@ -891,17 +891,6 @@ struct sk_buff *napi_alloc_skb(struct napi_struct *napi, unsigned int len)
 }
 EXPORT_SYMBOL(napi_alloc_skb);
 
-void skb_add_rx_frag_netmem(struct sk_buff *skb, int i, netmem_ref netmem,
-			    int off, int size, unsigned int truesize)
-{
-	DEBUG_NET_WARN_ON_ONCE(size > truesize);
-
-	skb_fill_netmem_desc(skb, i, netmem, off, size);
-	skb->len += size;
-	skb->data_len += size;
-	skb->truesize += truesize;
-}
-EXPORT_SYMBOL(skb_add_rx_frag_netmem);
 
 void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int size,
 			  unsigned int truesize)

-- 
2.53.0.414.gf7e9f6c205-goog

On Wed, Feb 25, 2026 at 8:12 PM Eric Dumazet [off-list ref] wrote:

This critical helper (via skb_add_rx_frag()) is mostly used
from drivers rx fast path.

It is time to inline it, this actually saves space in vmlinux:

size vmlinux.old vmlinux
   text    data     bss     dec     hex filename
37350766        23092977        4846992 65290735        3e441ef vmlinux.old
37350600        23092977        4846992 65290569        3e44149 vmlinux

Signed-off-by: Eric Dumazet <edumazet@google.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski [off-list ref]:

On Thu, 26 Feb 2026 04:12:13 +0000 you wrote:

This critical helper (via skb_add_rx_frag()) is mostly used
from drivers rx fast path.

It is time to inline it, this actually saves space in vmlinux:

size vmlinux.old vmlinux
   text    data     bss     dec     hex filename
37350766        23092977        4846992 65290735        3e441ef vmlinux.old
37350600        23092977        4846992 65290569        3e44149 vmlinux

[...]

Here is the summary with links:
  - [net-next] net: inline skb_add_rx_frag_netmem()
    https://git.kernel.org/netdev/net-next/c/6466441a5ecd

You are awesome, thank you!
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