From: Eric Biggers <ebiggers@google.com>

Instead of calling __skb_checksum() with a skb_checksum_ops struct that
does CRC32C, just call the new function skb_crc32c().  This is faster
and simpler.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 net/core/dev.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index d93bee5eb5d8c..430b3d3240d8f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3597,11 +3597,11 @@ int skb_checksum_help(struct sk_buff *skb)
 EXPORT_SYMBOL(skb_checksum_help);
 
 #ifdef CONFIG_NET_CRC32C
 int skb_crc32c_csum_help(struct sk_buff *skb)
 {
-	__le32 crc32c_csum;
+	u32 crc;
 	int ret = 0, offset, start;
 
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
 		goto out;
 
@@ -3625,14 +3625,12 @@ int skb_crc32c_csum_help(struct sk_buff *skb)
 
 	ret = skb_ensure_writable(skb, offset + sizeof(__le32));
 	if (ret)
 		goto out;
 
-	crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start,
-						  skb->len - start, ~(__u32)0,
-						  crc32c_csum_stub));
-	*(__le32 *)(skb->data + offset) = crc32c_csum;
+	crc = ~skb_crc32c(skb, start, skb->len - start, ~0);
+	*(__le32 *)(skb->data + offset) = cpu_to_le32(crc);
 	skb_reset_csum_not_inet(skb);
 out:
 	return ret;
 }
 EXPORT_SYMBOL(skb_crc32c_csum_help);
-- 
2.49.0

On 5/19/25 19:50, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Instead of calling __skb_checksum() with a skb_checksum_ops struct that
> does CRC32C, just call the new function skb_crc32c().  This is faster
> and simpler.
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>
> ---
>   net/core/dev.c | 8 +++-----
>   1 file changed, 3 insertions(+), 5 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich