Jon Maxwell 0f22c8a6ef ipv6: remove max_size check inline with ipv4 ... commit af6d10345c upstream. In ip6_dst_gc() replace: if (entries > gc_thresh) With: if (entries > ops->gc_thresh) Sending Ipv6 packets in a loop via a raw socket triggers an issue where a route is cloned by ip6_rt_cache_alloc() for each packet sent. This quickly consumes the Ipv6 max_size threshold which defaults to 4096 resulting in these warnings: [1] 99.187805] dst_alloc: 7728 callbacks suppressed [2] Route cache is full: consider increasing sysctl net.ipv6.route.max_size. . . [300] Route cache is full: consider increasing sysctl net.ipv6.route.max_size. When this happens the packet is dropped and sendto() gets a network is unreachable error: remaining pkt 200557 errno 101 remaining pkt 196462 errno 101 . . remaining pkt 126821 errno 101 Implement David Aherns suggestion to remove max_size check seeing that Ipv6 has a GC to manage memory usage. Ipv4 already does not check max_size. Here are some memory comparisons for Ipv4 vs Ipv6 with the patch: Test by running 5 instances of a program that sends UDP packets to a raw socket 5000000 times. Compare Ipv4 and Ipv6 performance with a similar program. Ipv4: Before test: MemFree: 29427108 kB Slab: 237612 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 2881 3990 192 42 2 : tunables 0 0 0 During test: MemFree: 29417608 kB Slab: 247712 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 44394 44394 192 42 2 : tunables 0 0 0 After test: MemFree: 29422308 kB Slab: 238104 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 Ipv6 with patch: Errno 101 errors are not observed anymore with the patch. Before test: MemFree: 29422308 kB Slab: 238104 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 During Test: MemFree: 29431516 kB Slab: 240940 kB ip6_dst_cache 11980 12064 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 After Test: MemFree: 29441816 kB Slab: 238132 kB ip6_dst_cache 1902 2432 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 Tested-by: Andrea Mayer <andrea.mayer@uniroma2.it> Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230112012532.311021-1-jmaxwell37@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Cc: "Jitindar Singh, Suraj" <surajjs@amazon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-01-15 18:54:51 +01:00
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ila	…
netfilter	…
Kconfig	…
Makefile	…
addrconf.c	net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX	2023-12-20 17:00:15 +01:00
addrconf_core.c	…
addrlabel.c	…
af_inet6.c	ipv4, ipv6: Use splice_eof() to flush	2024-01-10 17:10:27 +01:00
ah6.c	…
anycast.c	…
calipso.c	…
datagram.c	…
esp6.c	net: ipv6: fix return value check in esp_remove_trailer	2023-10-25 12:03:06 +02:00
esp6_offload.c	…
exthdrs.c	…
exthdrs_core.c	…
exthdrs_offload.c	…
fib6_notifier.c	…
fib6_rules.c	…
fou6.c	…
icmp.c	…
inet6_connection_sock.c	…
inet6_hashtables.c	…
ioam6.c	…
ioam6_iptunnel.c	…
ip6_checksum.c	…
ip6_fib.c	ipv6: fix potential NULL deref in fib6_add()	2023-12-13 18:39:06 +01:00
ip6_flowlabel.c	…
ip6_gre.c	net:ipv6: check return value of pskb_trim()	2023-07-27 08:50:45 +02:00
ip6_icmp.c	…
ip6_input.c	ipv6: ignore dst hint for multipath routes	2023-09-19 12:28:01 +02:00
ip6_offload.c	…
ip6_offload.h	…
ip6_output.c	net: annotate data-races around sk->sk_tsflags	2024-01-10 17:10:23 +01:00
ip6_tunnel.c	…
ip6_udp_tunnel.c	…
ip6_vti.c	ip6_vti: fix slab-use-after-free in decode_session6	2023-08-23 17:52:32 +02:00
ip6mr.c	ip6mr: Fix skb_under_panic in ip6mr_cache_report()	2023-08-11 12:08:17 +02:00
ipcomp6.c	…
ipv6_sockglue.c	…
mcast.c	…
mcast_snoop.c	…
mip6.c	…
ndisc.c	neighbour: annotate lockless accesses to n->nud_state	2023-10-10 22:00:42 +02:00
netfilter.c	…
output_core.c	…
ping.c	net: annotate data-races around sk->sk_tsflags	2024-01-10 17:10:23 +01:00
proc.c	…
protocol.c	…
raw.c	net: annotate data-races around sk->sk_tsflags	2024-01-10 17:10:23 +01:00
reassembly.c	…
route.c	ipv6: remove max_size check inline with ipv4	2024-01-15 18:54:51 +01:00
rpl.c	…
rpl_iptunnel.c	…
seg6.c	…
seg6_hmac.c	…
seg6_iptunnel.c	…
seg6_local.c	…
sit.c	…
syncookies.c	dccp/tcp: Call security_inet_conn_request() after setting IPv6 addresses.	2023-11-20 11:52:16 +01:00
sysctl_net_ipv6.c	…
tcp_ipv6.c	ipv4, ipv6: Use splice_eof() to flush	2024-01-10 17:10:27 +01:00
tcpv6_offload.c	…
tunnel6.c	…
udp.c	udp: annotate data-races around udp->encap_type	2024-01-10 17:10:28 +01:00
udp_impl.h	…
udp_offload.c	…
udplite.c	…
xfrm6_input.c	udp: annotate data-races around udp->encap_type	2024-01-10 17:10:28 +01:00
xfrm6_output.c	…
xfrm6_policy.c	xfrm6: fix inet6_dev refcount underflow problem	2023-10-25 12:03:12 +02:00
xfrm6_protocol.c	…
xfrm6_state.c	…
xfrm6_tunnel.c	…