net: remove skb_copy_and_hash_datagram_iter()

Now that skb_copy_and_hash_datagram_iter() is no longer used, remove it.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://patch.msgid.link/20250519175012.36581-11-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: ebiggers

include/linux/skbuff.h

@@ -274,7 +274,6 @@
 			 SKB_DATA_ALIGN(sizeof(struct sk_buff)) +	\
 			 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
 
-struct ahash_request;
 struct net_device;
 struct scatterlist;
 struct pipe_inode_info;
@@ -4134,9 +4133,6 @@ static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset,
 }
 int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen,
 				   struct msghdr *msg);
-int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset,
-			   struct iov_iter *to, int len,
-			   struct ahash_request *hash);
 int skb_copy_and_crc32c_datagram_iter(const struct sk_buff *skb, int offset,
 				      struct iov_iter *to, int len, u32 *crcp);
 int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset,

net/core/datagram.c

@@ -62,7 +62,6 @@
 #include <net/tcp_states.h>
 #include <trace/events/skb.h>
 #include <net/busy_poll.h>
-#include <crypto/hash.h>
 
 #include "devmem.h"
 
@@ -484,42 +483,6 @@ static int __skb_datagram_iter(const struct sk_buff *skb, int offset,
 	return 0;
 }
 
-static size_t hash_and_copy_to_iter(const void *addr, size_t bytes, void *hashp,
-				    struct iov_iter *i)
-{
-#ifdef CONFIG_CRYPTO_HASH
-	struct ahash_request *hash = hashp;
-	struct scatterlist sg;
-	size_t copied;
-
-	copied = copy_to_iter(addr, bytes, i);
-	sg_init_one(&sg, addr, copied);
-	ahash_request_set_crypt(hash, &sg, NULL, copied);
-	crypto_ahash_update(hash);
-	return copied;
-#else
-	return 0;
-#endif
-}
-
-/**
- *	skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator
- *          and update a hash.
- *	@skb: buffer to copy
- *	@offset: offset in the buffer to start copying from
- *	@to: iovec iterator to copy to
- *	@len: amount of data to copy from buffer to iovec
- *      @hash: hash request to update
- */
-int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset,
-			   struct iov_iter *to, int len,
-			   struct ahash_request *hash)
-{
-	return __skb_datagram_iter(skb, offset, to, len, true,
-			hash_and_copy_to_iter, hash);
-}
-EXPORT_SYMBOL(skb_copy_and_hash_datagram_iter);
-
 #ifdef CONFIG_NET_CRC32C
 static size_t crc32c_and_copy_to_iter(const void *addr, size_t bytes,
 				      void *_crcp, struct iov_iter *i)