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authorPaolo Abeni <pabeni@redhat.com>2021-08-25 02:26:14 +0300
committerDavid S. Miller <davem@davemloft.net>2021-08-25 13:02:34 +0300
commitd7b269083786dca3b1b0141bde6cea834062b691 (patch)
tree7ea30ec79213588b734c1d1e5bcf338244f8f798 /include/net/mptcp.h
parent1bff1e43a30e2f7500a49d47fd26a425643a6a37 (diff)
downloadlinux-d7b269083786dca3b1b0141bde6cea834062b691.tar.xz
mptcp: shrink mptcp_out_options struct
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>
Diffstat (limited to 'include/net/mptcp.h')
-rw-r--r--include/net/mptcp.h26
1 files changed, 17 insertions, 9 deletions
diff --git a/include/net/mptcp.h b/include/net/mptcp.h
index 8b5af683a818..3236010afa29 100644
--- a/include/net/mptcp.h
+++ b/include/net/mptcp.h
@@ -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
};