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Message-ID: <20260130210303.3888261-1-edumazet@google.com>
Date: Fri, 30 Jan 2026 21:02:55 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>,
Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/8] ipv6: misc changes in output path
Small optimizations mostly in ip6_xmit() path.
TX performance increases by about 3 %.
Patches 5-7: add dst4_mtu() and dst6_mtu() to save space.
Last patch colocates inet6_cork in inet_cork_full.
This series reduces kernel size by 494 bytes on x86_64:
scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 4/2 grow/shrink: 9/23 up/down: 665/-1159 (-494)
Function old new delta
ip6_finish_output_gso_slowpath_drop - 197 +197
ip6_xmit 1452 1595 +143
do_ipv6_getsockopt 2855 2950 +95
kzalloc_noprof - 55 +55
ip4ip6_err 918 955 +37
__icmp_send 1499 1532 +33
do_ip_getsockopt 2573 2605 +32
__ip6_append_data 4109 4137 +28
__pfx_kzalloc_noprof - 16 +16
__pfx_ip6_finish_output_gso_slowpath_drop - 16 +16
ipmr_prepare_xmit 1232 1238 +6
ip6_forward 1905 1909 +4
ip6_cork_release 108 111 +3
ipv6_push_nfrag_opts 489 486 -3
ipv6_push_frag_opts 90 87 -3
ip6_finish_output2 1446 1437 -9
ip6_tnl_xmit 2639 2627 -12
ip6_default_advmss 176 160 -16
__ip6_rt_update_pmtu 1087 1071 -16
tcp_v6_syn_recv_sock 1715 1696 -19
tcp_v4_syn_recv_sock 1107 1088 -19
__ip_make_skb 1339 1320 -19
ip_setup_cork 406 385 -21
ip6_setup_cork 732 710 -22
rawv6_push_pending_frames 581 556 -25
ip6_push_pending_frames 184 157 -27
udpv6_splice_eof 203 170 -33
ip6_flush_pending_frames 220 183 -37
ip6_append_data 349 312 -37
udp_v6_push_pending_frames 155 115 -40
sit_tunnel_xmit 1957 1914 -43
__pfx_dst_mtu 64 - -64
tcp_v4_mtu_reduced 289 220 -69
tcp_v6_mtu_reduced 209 139 -70
ip6_make_skb 574 484 -90
ip6_finish_output 827 697 -130
dst_mtu 160 - -160
fib6_nh_mtu_change 511 336 -175
Total: Before=22584400, After=22583906, chg -0.00%
Eric Dumazet (8):
ipv6: pass proto by value to ipv6_push_nfrag_opts() and
ipv6_push_frag_opts()
ipv6: add some unlikely()/likely() clauses in ip6_output.c
ipv6: use __skb_push() in ip6_xmit()
ipv6: use SKB_DROP_REASON_PKT_TOO_BIG in ip6_xmit()
inet: add dst4_mtu() and dst6_mtu() helpers
ipv6: use dst6_mtu() instead of dst_mtu()
ipv4: use dst4_mtu() instead of dst_mtu()
ipv6: colocate inet6_cork in inet_cork_full
include/linux/ipv6.h | 8 ---
include/net/dst.h | 6 ++
include/net/inet_sock.h | 10 +++
include/net/ip6_route.h | 6 ++
include/net/ipv6.h | 16 ++---
net/ipv4/icmp.c | 2 +-
net/ipv4/ip_output.c | 4 +-
net/ipv4/ip_sockglue.c | 2 +-
net/ipv4/ipmr.c | 2 +-
net/ipv4/netfilter/nf_reject_ipv4.c | 2 +-
net/ipv4/tcp_ipv4.c | 13 ++--
net/ipv6/exthdrs.c | 55 +++++++-------
net/ipv6/ip6_gre.c | 2 +-
net/ipv6/ip6_output.c | 108 ++++++++++++++--------------
net/ipv6/ip6_tunnel.c | 6 +-
net/ipv6/ipv6_sockglue.c | 4 +-
net/ipv6/raw.c | 2 +-
net/ipv6/route.c | 10 +--
net/ipv6/sit.c | 2 +-
net/ipv6/tcp_ipv6.c | 9 +--
20 files changed, 144 insertions(+), 125 deletions(-)
--
2.53.0.rc1.225.gd81095ad13-goog
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