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mptcp: shrink mptcp_out_options struct

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After the previous patch we can alias with a union several
fields in mptcp_out_options. Such struct is stack allocated and
memset() for each plain TCP out packet. Every saved byted counts.

Before:
pahole -EC mptcp_out_options
 # ...
/* size: 136, cachelines: 3, members: 17 */

After:
pahole -EC mptcp_out_options
 # ...
/* size: 56, cachelines: 1, members: 9 */

Signed-off-by: Paolo Abeni <pabeni@redhat.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:
Paolo Abeni 2021-08-24 16:26:14 -07:00 committed by David S. Miller
parent 1bff1e43a3
commit d7b2690837
1 changed files with 17 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

26
include/net/mptcp.h
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@ -58,10 +58,6 @@ struct mptcp_addr_info {
struct mptcp_out_options {
#if IS_ENABLED(CONFIG_MPTCP)
u16 suboptions;
u64 sndr_key;
u64 rcvr_key;
u64 ahmac;
struct mptcp_addr_info addr;
struct mptcp_rm_list rm_list;
u8 join_id;
u8 backup;
@ -69,11 +65,23 @@ struct mptcp_out_options {
reset_transient:1,
csum_reqd:1,
allow_join_id0:1;
u32 nonce;
u64 thmac;
u32 token;
u8 hmac[20];
struct mptcp_ext ext_copy;
union {
struct {
u64 sndr_key;
u64 rcvr_key;
};
struct {
struct mptcp_addr_info addr;
u64 ahmac;
};
struct mptcp_ext ext_copy;
struct {
u32 nonce;
u32 token;
u64 thmac;
u8 hmac[20];
};
};
#endif
};