[PATCH v2 06/14] datagram: introduce skb_copy_and_hash_datagram_iter helper
From: Sagi Grimberg <sagi@grimberg.me>
Date: 2018-11-20 03:01:03
Also in:
linux-block, linux-nvme
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> --- include/linux/skbuff.h | 3 +++ net/core/datagram.c | 17 +++++++++++++++++ 2 files changed, 20 insertions(+)
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..e6a4fc845f72 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c@@ -492,6 +492,23 @@ 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); +} + static size_t simple_copy_to_iter(const void *addr, size_t bytes, void *data __always_unused, struct iov_iter *i) {
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2.17.1