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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jul 2021 11:04:29.6809 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 354ce2b0-fcd5-4de4-136e-08d94d007a65 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.36];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT026.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3486 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Boris Pismenny This commit introduces new functions to support direct data placement (DDP) NIC offloads that avoid copying data from SKBs. Later patches will use this for nvme-tcp DDP offload. Signed-off-by: Boris Pismenny Signed-off-by: Ben Ben-Ishay Signed-off-by: Or Gerlitz Signed-off-by: Yoray Zack --- include/linux/skbuff.h | 9 ++++++++ net/core/datagram.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index d323ecd37448..8c1bfd7081d1 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3613,6 +3613,10 @@ __poll_t datagram_poll(struct file *file, struct socket *sock, struct poll_table_struct *wait); int skb_copy_datagram_iter(const struct sk_buff *from, int offset, struct iov_iter *to, int size); +#ifdef CONFIG_TCP_DDP +int skb_ddp_copy_datagram_iter(const struct sk_buff *from, int offset, + struct iov_iter *to, int size); +#endif static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset, struct msghdr *msg, int size) { @@ -3623,6 +3627,11 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen, int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, struct iov_iter *to, int len, struct ahash_request *hash); +#ifdef CONFIG_TCP_DDP +int skb_ddp_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len, + struct ahash_request *hash); +#endif 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 15ab9ffb27fe..d346fd5da22c 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -495,6 +495,27 @@ static int __skb_datagram_iter(const struct sk_buff *skb, int offset, return 0; } +#ifdef CONFIG_TCP_DDP +/** + * skb_ddp_copy_and_hash_datagram_iter - Copies datagrams from skb frags to + * an iterator and update a hash. If the iterator and skb frag point to the + * same page and offset, then the copy is skipped. + * @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_ddp_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, + ddp_hash_and_copy_to_iter, hash); +} +EXPORT_SYMBOL(skb_ddp_copy_and_hash_datagram_iter); +#endif + /** * skb_copy_and_hash_datagram_iter - Copy datagram to an iovec iterator * and update a hash. @@ -513,6 +534,33 @@ int skb_copy_and_hash_datagram_iter(const struct sk_buff *skb, int offset, } EXPORT_SYMBOL(skb_copy_and_hash_datagram_iter); +#ifdef CONFIG_TCP_DDP +static size_t simple_ddp_copy_to_iter(const void *addr, size_t bytes, + void *data __always_unused, + struct iov_iter *i) +{ + return ddp_copy_to_iter(addr, bytes, i); +} + +/** + * skb_ddp_copy_datagram_iter - Copies datagrams from skb frags to an + * iterator. If the iterator and skb frag point to the same page and + * offset, then the copy is skipped. + * @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 + */ +int skb_ddp_copy_datagram_iter(const struct sk_buff *skb, int offset, + struct iov_iter *to, int len) +{ + trace_skb_copy_datagram_iovec(skb, len); + return __skb_datagram_iter(skb, offset, to, len, false, + simple_ddp_copy_to_iter, NULL); +} +EXPORT_SYMBOL(skb_ddp_copy_datagram_iter); +#endif + static size_t simple_copy_to_iter(const void *addr, size_t bytes, void *data __always_unused, struct iov_iter *i) { -- 2.24.1