From: Jakub Kicinski Date: Tue, 3 Feb 2026 01:49:31 +0000 (-0800) Subject: Merge branch 'ipv6-misc-changes-in-output-path' X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8755aae4aa7569f079135a0590dbd0f7adcfacf4;p=thirdparty%2Fkernel%2Flinux.git Merge branch 'ipv6-misc-changes-in-output-path' Eric Dumazet says: ==================== 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% ==================== Link: https://patch.msgid.link/20260130210303.3888261-1-edumazet@google.com Signed-off-by: Jakub Kicinski --- 8755aae4aa7569f079135a0590dbd0f7adcfacf4