From: Paolo Abeni <pabeni@redhat.com>
To: mptcp@lists.linux.dev
Cc: Geliang Tang <geliangtang@gmail.com>
Subject: [PATCH v3 mptcp-next 3/3] mptcp: shrink mptcp_out_options struct
Date: Mon, 26 Jul 2021 12:55:29 +0200 [thread overview]
Message-ID: <b16f81f297f84c8cd9c575fde823baa4eb54ea95.1627296764.git.pabeni@redhat.com> (raw)
In-Reply-To: <cover.1627296764.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
next prev parent reply other threads:[~2021-07-26 10:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 10:55 [PATCH v3 mptcp-next 0/3] mptcp: minor out optimization Paolo Abeni
2021-07-26 10:55 ` [PATCH v3 mptcp-next 1/3] Squash-to: "mptcp: move drop_other_suboptions check under pm lock" Paolo Abeni
2021-07-27 4:27 ` Geliang Tang
2021-07-26 10:55 ` [PATCH v3 mptcp-next 2/3] mptcp: optimize out option generation Paolo Abeni
2021-07-27 4:33 ` Geliang Tang
2021-07-26 10:55 ` Paolo Abeni [this message]
2021-07-28 0:40 ` [PATCH v3 mptcp-next 0/3] mptcp: minor out optimization Mat Martineau
2021-07-28 8:09 ` Matthieu Baerts
2021-07-28 10:46 ` Paolo Abeni
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