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authorSagi Grimberg <sagi@lightbitslabs.com>2018-12-03 17:52:10 -0800
committerChristoph Hellwig <hch@lst.de>2018-12-13 09:58:55 +0100
commit65d69e2505bb64f6a8d7f417f6e46e2a351174c6 (patch)
tree12a8a9edd9ef57ee9f77abf770f5f3c8d658c6f5 /net/core
parentd05f443554b3c7dc6d46e3ba9c3c4de468875d4f (diff)
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datagram: introduce skb_copy_and_hash_datagram_iter helper
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 <davem@davemloft.net> Signed-off-by: Sagi Grimberg <sagi@lightbitslabs.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/datagram.c20
1 files changed, 19 insertions, 1 deletions
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 @@ short_copy:
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)
{