From: Paolo Abeni <pabeni@redhat.com>
To: mptcp@lists.linux.dev
Subject: [PATCH mptcp-next 2/2] mptcp: shrink mptcp_out_options struct
Date: Fri, 23 Jul 2021 19:06:06 +0200 [thread overview]
Message-ID: <35052720a5d781e597cef76c3f298520198b0001.1627059686.git.pabeni@redhat.com> (raw)
In-Reply-To: <cover.1627059686.git.pabeni@redhat.com>
After the previous patch we can alias with an 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>
---
include/net/mptcp.h | 26 +++++++++++++++++---------
1 file 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
};
--
2.26.3
prev parent reply other threads:[~2021-07-23 17:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-23 17:06 [PATCH mptcp-next 0/2] mptcp: minor out optimization Paolo Abeni
2021-07-23 17:06 ` [PATCH mptcp-next 1/2] mptcp: optimize out option generation Paolo Abeni
2021-07-26 3:21 ` Geliang Tang
2021-07-26 9:44 ` Paolo Abeni
2021-07-26 10:02 ` Geliang Tang
2021-07-26 10:06 ` Paolo Abeni
2021-07-23 17:06 ` Paolo Abeni [this message]
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