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Jon Maxwell af6d10345c ipv6: remove max_size check inline with ipv4 
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>
 		2023-01-13 20:59:14 -08:00
..
9p net/9p: distinguish zero-copy requests 2022-12-06 07:30:55 +09:00
bluetooth Bluetooth: Add quirk to disable MWS Transport Configuration 2022-12-12 14:19:24 -08:00
caif net: remove the caif_hsi driver 2021-07-01 13:19:48 -07:00
iucv net/af_iucv: Use struct_group() to zero struct iucv_sock region 2021-11-19 11:52:25 +00:00
mana v6.2 merge window pull request 2022-12-14 09:27:13 -08:00
netfilter netfilter: nf_tables: honor set timeout and garbage collection updates 2022-12-22 10:36:37 +01:00
netns net: xsk: Don't include <linux/rculist.h> 2022-12-06 20:04:34 -08:00
nfc NFC: add NCI_UNREG flag to eliminate the race 2021-11-17 20:17:05 -08:00
phonet net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
sctp sctp: delete free member from struct sctp_sched_ops 2022-12-01 20:14:23 -08:00
tc_act net: sched: add helper support in act_ct 2022-11-08 12:15:19 +01:00
6lowpan.h
…
Space.h wan: remove sbni/granch driver 2021-08-03 13:05:26 +01:00
act_api.h net/sched: move struct action_ops definition out of ifdef 2022-12-09 09:18:07 +00:00
addrconf.h ipv6/addrconf: fix a null-ptr-deref bug for ip6_ptr 2022-07-28 10:42:44 -07:00
af_ieee802154.h
…
af_rxrpc.h rxrpc: Tidy up abort generation infrastructure 2023-01-06 09:43:32 +00:00
af_unix.h af_unix: Remove unix_table_locks. 2022-06-22 12:59:43 +01:00
af_vsock.h vsock: add API call for data ready 2022-08-23 10:43:11 +02:00
ah.h
…
amt.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
arp.h ipv4: Invalidate neighbour for broadcast address upon address addition 2022-02-21 11:44:30 +00:00
atmclip.h
…
ax25.h ax25: fix incorrect dev_tracker usage 2022-07-28 22:06:15 -07:00
ax88796.h ax88796: Fix some typo in a comment 2022-08-09 22:14:02 -07:00
bareudp.h bareudp: Move definition of struct bareudp_conf to bareudp.c 2021-12-13 12:34:09 +00:00
bond_3ad.h net: bonding: Share lacpdu_mcast_addr definition 2022-09-16 14:34:01 +01:00
bond_alb.h bonding (gcc13): synchronize bond_{a,t}lb_xmit() types 2022-11-02 20:38:13 -07:00
bond_options.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
bonding.h bond: Disable TLS features indication 2022-10-27 12:45:38 +02:00
bpf_sk_storage.h bpf: struct sock is declared twice in bpf_sk_storage header 2021-03-26 17:43:55 +01:00
busy_poll.h net: Fix a data-race around sysctl_net_busy_poll. 2022-08-24 13:46:58 +01:00
calipso.h
…
cfg80211-wext.h wifi: cfg80211: Avoid clashing function prototypes 2022-11-16 11:31:47 +02:00
cfg80211.h wifi: cfg80211: Correct example of ieee80211_iface_limit 2022-12-01 13:53:19 +01:00
cfg802154.h ieee802154: Advertize coordinators discovery 2022-11-29 15:34:22 +01:00
checksum.h powerpc/net: Implement powerpc specific csum_shift() to remove branch 2022-03-11 10:57:22 +00:00
cipso_ipv4.h cipso: Remove unused inline functions 2020-07-15 07:45:24 -07:00
cls_cgroup.h
…
codel.h codel: remove unnecessary pkt_sched.h include 2021-12-22 15:03:51 -08:00
codel_impl.h codel: remove unnecessary sock.h include 2021-12-22 15:03:47 -08:00
codel_qdisc.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
compat.h net: copy from user before calling __get_compat_msghdr 2022-07-24 18:39:17 -06:00
datalink.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
dcbevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
dcbnl.h net: dcb: add new apptrust attribute 2022-11-03 15:16:50 +01:00
devlink.h devlink: remove the registration guarantee of references 2023-01-06 12:56:19 +00:00
dropreason.h net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR 2022-10-31 20:14:27 -07:00
dsa.h net: dsa: move tag_8021q headers to their proper place 2022-11-22 20:41:53 -08:00
dsfield.h
…
dst.h net: add atomic_long_t to net_device_stats fields 2022-11-16 12:48:44 +00:00
dst_cache.h wireguard: device: reset peer src endpoint when netns exits 2021-11-29 19:50:45 -08:00
dst_metadata.h xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF 2022-12-05 21:58:27 -08:00
dst_ops.h ipv6: remove max_size check inline with ipv4 2023-01-13 20:59:14 -08:00
erspan.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
esp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
espintcp.h
…
ethoc.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
failover.h net: failover: add net device refcount tracker 2021-12-06 16:06:02 -08:00
fib_notifier.h
…
fib_rules.h fib: expand fib_rule_policy 2021-12-16 07:18:35 -08:00
firewire.h firewire: net: Make use of get_unaligned_be48(), put_unaligned_be48() 2022-07-28 22:21:54 -07:00
flow.h net: Remove DECnet leftovers from flow.h. 2022-10-03 12:41:59 +01:00
flow_dissector.h flow_dissector: Add L2TPv3 dissectors 2022-09-20 09:13:38 +02:00
flow_offload.h net: flow_offload: add support for ARP frame matching 2022-11-14 11:24:16 +00:00
fou.h
…
fq.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
fq_impl.h wifi: mac80211: add support for restricting netdev features per vif 2022-12-01 15:09:10 +01:00
garp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
gen_stats.h net: sched: Remove Qdisc::running sequence counter 2021-10-18 12:54:41 +01:00
genetlink.h mptcp: more detailed error reporting on endpoint creation 2022-11-21 13:09:07 +00:00
geneve.h net: geneve: fix array of flexible structures warnings 2022-10-31 10:43:04 +00:00
gre.h ip_gre: add csum offload support for gre header 2021-01-29 20:39:14 -08:00
gro.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-08-25 16:07:42 -07:00
gro_cells.h
…
gtp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
gue.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
hwbm.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
icmp.h ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages 2021-06-28 14:29:45 -07:00
ieee80211_radiotap.h ieee80211: radiotap: fix -Wcast-qual warnings 2022-02-04 16:25:21 +01:00
ieee802154_netdev.h Merge tag 'ieee802154-for-net-next-2022-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next 2022-10-26 15:24:36 +01:00
if_inet6.h ipv6: fix locking issues with loops over idev->addr_list 2022-04-06 22:09:39 -07:00
ife.h
…
ila.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet6_connection_sock.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet6_hashtables.h net: allow unbound socket for packets in VRF when tcp_l3mdev_accept set 2022-07-29 11:58:54 +01:00
inet_common.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
inet_connection_sock.h net: Add a bhash2 table hashed by port and address 2022-08-24 19:30:07 -07:00
inet_dscp.h ipv6: Define dscp_t and stop taking ECN bits into account in fib6-rules 2022-02-07 20:12:45 -08:00
inet_ecn.h net: add skb_get_dsfield() helper 2021-10-15 11:33:08 +01:00
inet_frag.h net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT 2022-10-31 20:14:27 -07:00
inet_hashtables.h tcp: Add TIME_WAIT sockets in bhash2. 2022-12-30 07:25:52 +00:00
inet_sock.h net: allow unbound socket for packets in VRF when tcp_l3mdev_accept set 2022-07-29 11:58:54 +01:00
inet_timewait_sock.h tcp: Add TIME_WAIT sockets in bhash2. 2022-12-30 07:25:52 +00:00
inetpeer.h
…
ioam6.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
ip.h net: use struct_group to copy ip/ipv6 header addresses 2022-11-17 10:42:45 +01:00
ip6_checksum.h net: move gro definitions to include/net/gro.h 2021-11-16 13:16:54 +00:00
ip6_fib.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
ip6_route.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ip6_tunnel.h ip_gre, ip6_gre: Fix race condition on o_seqno in collect_md mode 2022-04-25 11:40:45 +01:00
ip_fib.h ipv4: Use dscp_t in struct fib_entry_notifier_info 2022-04-11 17:37:50 -07:00
ip_tunnels.h net: Add helper function to parse netlink msg of ip_tunnel_parm 2022-10-03 07:59:06 +01:00
ip_vs.h ipvs: run_estimation should control the kthread tasks 2022-12-10 22:44:43 +01:00
ipcomp.h xfrm: ipcomp: add extack to ipcomp{4,6}_init_state 2022-09-29 07:18:00 +02:00
ipconfig.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ipv6.h IPv6/GRO: generic helper to remove temporary HBH/jumbo header in driver 2022-12-12 15:41:44 -08:00
ipv6_frag.h net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT 2022-10-31 20:14:27 -07:00
ipv6_stubs.h bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt() 2022-09-02 20:34:32 -07:00
iw_handler.h
…
kcm.h
…
l3mdev.h l3mdev: add infrastructure for table to VRF mapping 2020-06-20 17:22:22 -07:00
lag.h
…
lapb.h net: lapb: Make "lapb_t1timer_running" able to detect an already running timer 2021-03-23 14:14:50 -07:00
lib80211.h
…
llc.h llc: fix out-of-bound array index in llc_sk_dev_hash() 2021-11-07 19:25:29 +00:00
llc_c_ac.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_c_ev.h
…
llc_c_st.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_conn.h llc: add net device refcount tracker 2021-12-07 20:44:59 -08:00
llc_if.h llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
llc_pdu.h net: llc: fix skb_over_panic 2021-07-27 13:05:56 +01:00
llc_s_ac.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_s_ev.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
llc_s_st.h add missing includes and forward declarations to networking includes under linux/ 2022-07-28 11:29:36 +02:00
llc_sap.h
…
lwtunnel.h netfilter: add netfilter hooks to SRv6 data plane 2021-08-30 01:51:36 +02:00
mac80211.h wifi: mac80211: add support for restricting netdev features per vif 2022-12-01 15:09:10 +01:00
mac802154.h mac802154: Drop IEEE802154_HW_RX_DROP_BAD_CKSUM 2022-10-12 12:57:19 +02:00
macsec.h net: macsec: remove the prepare flag from the MACsec offloading context 2022-09-23 06:56:08 -07:00
mctp.h mctp: Use output netdev to allocate skb headroom 2022-04-01 12:04:15 +01:00
mctpdevice.h mctp: Pass flow data & flow release events to drivers 2021-10-29 13:23:51 +01:00
mip6.h
…
mld.h mld: add new workqueues for process mld events 2021-03-26 15:14:56 -07:00
mpls.h net: Make mpls_entry_encode() available for generic users 2020-05-29 21:20:20 -07:00
mpls_iptunnel.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
mptcp.h mptcp: remove MPTCP 'ifdef' in TCP SYN cookies 2022-12-12 13:11:24 -08:00
mrp.h mrp: introduce active flags to prevent UAF when applicant uninit 2022-11-18 12:14:55 +00:00
ncsi.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ndisc.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-03-03 11:55:12 -08:00
neighbour.h net: neigh: decrement the family specific qlen 2022-11-18 10:29:50 +00:00
net_debug.h net: add CONFIG_DEBUG_NET 2022-05-11 12:43:10 +01:00
net_failover.h
…
net_namespace.h net: add a refcount tracker for kernel sockets 2022-10-24 11:04:43 +01:00
net_ratelimit.h
…
net_trackers.h net: add networking namespace refcount tracker 2021-12-10 06:38:26 -08:00
netevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
netlabel.h
…
netlink.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-11-03 13:21:54 -07:00
netprio_cgroup.h
…
netrom.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
nexthop.h net: ipv4: Fix rtnexthop len when RTA_FLOW is present 2021-09-24 14:07:10 +01:00
nl802154.h ieee802154: Advertize coordinators discovery 2022-11-29 15:34:22 +01:00
nsh.h
…
p8022.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
page_pool.h net: page_pool: introduce ethtool stats 2022-04-15 10:43:47 +01:00
pie.h
…
ping.h inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
pkt_cls.h net: sched: cls_api: introduce tc_cls_bind_class() helper 2022-10-02 16:07:17 +01:00
pkt_sched.h net/sched: taprio: allow user input of per-tc max SDU 2022-09-29 18:52:05 -07:00
pptp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
protocol.h tcp/udp: Make early_demux back namespacified. 2022-07-15 18:50:35 -07:00
psample.h psample: Add a fwd declaration for skbuff 2021-08-09 15:34:21 -07:00
psnap.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
raw.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-07-14 15:27:35 -07:00
rawv6.h raw: convert raw sockets to RCU 2022-06-19 10:00:02 +01:00
red.h treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
regulatory.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
request_sock.h tcp: Use BPF timeout setting for SYN ACK RTO 2022-02-02 14:45:18 +00:00
rose.h net: rose: add netdev ref tracker to 'struct rose_sock' 2022-08-01 11:59:23 -07:00
route.h Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2022-07-25 13:25:39 +01:00
rpl.h net: ipv6: Use struct_size() helper and kcalloc() 2020-06-23 20:27:09 -07:00
rsi_91x.h
…
rtnetlink.h rtnetlink: Honour NLM_F_ECHO flag in rtnl_delete_link 2022-10-31 18:10:21 -07:00
rtnh.h
…
sch_generic.h net/sched: query offload capabilities through ndo_setup_tc() 2022-09-29 18:52:01 -07:00
scm.h fs: Move __scm_install_fd() to __receive_fd() 2020-07-13 11:03:44 -07:00
secure_seq.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
seg6.h udp6: Use Segment Routing Header for dest address if present 2022-01-04 12:17:35 +00:00
seg6_hmac.h
…
seg6_local.h
…
selftests.h net: selftest: fix build issue if INET is disabled 2021-04-28 14:06:45 -07:00
slhc_vj.h
…
smc.h net/smc: Pass on DMBE bit mask in IRQ handler 2022-07-27 13:24:42 +01:00
snmp.h
…
sock.h net: simplify sk_page_frag 2022-12-19 17:28:50 -08:00
sock_reuseport.h soreuseport: Fix socket selection for SO_INCOMING_CPU. 2022-10-25 11:35:16 +02:00
stp.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
strparser.h tls: rx: remove the message decrypted tracking 2022-07-18 11:24:10 +01:00
switchdev.h bridge: switchdev: Allow device drivers to install locked FDB entries 2022-11-09 19:06:13 -08:00
tc_wrapper.h net/sched: fix retpoline wrapper compilation on configs without tc filters 2022-12-28 12:11:32 +00:00
tcp.h bpf-next-for-netdev 2022-12-12 11:27:42 -08:00
tcp_states.h
…
timewait_sock.h
…
tipc.h
…
tls.h net/tls: Describe ciphers sizes by const structs 2022-09-22 17:27:41 -07:00
tls_toe.h
…
transp_v6.h inet6: Remove inet6_destroy_sock(). 2022-10-24 09:40:39 +01:00
tso.h net: tso: inline tso_count_descs() 2022-12-12 15:04:39 -08:00
tun_proto.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
udp.h udp: track the forward memory release threshold in an hot cacheline 2022-10-24 10:52:50 +01:00
udp_tunnel.h net: Change the udp encap_err_rcv to allow use of {ip,ipv6}_icmp_error() 2022-11-08 16:42:28 +00:00
udplite.h tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct(). 2022-10-12 17:50:37 -07:00
vsock_addr.h
…
vxlan.h drivers: vxlan: vnifilter: per vni stats 2022-03-01 08:38:02 +00:00
wext.h
…
x25.h
…
x25device.h
…
xdp.h xdp: Adjust xdp_frame layout to avoid using bitfields 2022-09-26 13:28:19 -07:00
xdp_priv.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
xdp_sock.h net: Don't include filter.h from net/sock.h 2021-12-29 08:48:14 -08:00
xdp_sock_drv.h xsk: Remove unused xsk_buff_discard 2022-09-30 07:55:46 -07:00
xfrm.h bpf-next-for-netdev 2022-12-12 11:27:42 -08:00
xsk_buff_pool.h xsk: Inherit need_wakeup flag for shared sockets 2022-09-22 17:16:22 +02:00