[PATCH v5 06/13] datagram: introduce skb_copy_and_hash_datagram_iter helper

[Sagi Grimberg]

From: Sagi Grimberg <s...@lightbitslabs.com>

Introduce a helper to copy datagram into an iovec iterator
but also update a predefined hash. This is useful for
consumers of skb_copy_datagram_iter to also support inflight
data digest without having to finish to copy and only then
traverse the iovec and calculate the digest hash.

Acked-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sagi Grimberg <s...@lightbitslabs.com>
---
 include/linux/skbuff.h |  3 +++
 net/core/datagram.c    | 20 +++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0ba687454267..b0b8d5653f0d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3309,6 +3309,9 @@ 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_datagram_from_iter(struct sk_buff *skb, int offset,
                                 struct iov_iter *from, int len);
 int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm);
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 382543302ae5..ef262282c8be 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -465,7 +465,7 @@ int __skb_datagram_iter(const struct sk_buff *skb, int 
offset,
                        if (copy > len)
                                copy = len;
                        if (__skb_datagram_iter(frag_iter, offset - start,
-                                               to, copy, short_copy, cb, data))
+                                               to, copy, fault_short, cb, 
data))
                                goto fault;
                        if ((len -= copy) == 0)
                                return 0;
@@ -492,6 +492,24 @@ int __skb_datagram_iter(const struct sk_buff *skb, int 
offset,
        return 0;
 }
 
+/**
+ *     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);
+
 static size_t simple_copy_to_iter(const void *addr, size_t bytes,
                void *data __always_unused, struct iov_iter *i)
 {
-- 
2.17.1