mptcp: generate the data checksum

This patch added a new member named csum in struct mptcp_ext, implemented
a new function named mptcp_generate_data_checksum().

Generate the data checksum in mptcp_sendmsg_frag, save it in mpext->csum.

Note that we must generate the csum for zero window probe, too.

Do the csum update incrementally, to avoid multiple csum computation
when the data is appended to existing skb.

Note that in a later patch we will skip unneeded csum related operation.
Changes not included here to keep the delta small.

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This commit is contained in:

Geliang Tang

2021-06-18 11:40:11 -07:00

committed by

David S. Miller

parent 752e906732

commit d0cc298745

3 changed files with 25 additions and 1 deletions

									
										include/net/mptcp.h
									
		+1
		
												View File
												
				@@ -23,6 +23,7 @@ struct mptcp_ext {

					u64		data_seq;

					u32		subflow_seq;

					u16		data_len;

					__sum16		csum;

					u8		use_map:1,

							dsn64:1,

							data_fin:1,