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Roopa Prabhu d297653dd6 rtnetlink: fdb dump: optimize by saving last interface markers 
fdb dumps spanning multiple skb's currently restart from the first
interface again for every skb. This results in unnecessary
iterations on the already visited interfaces and their fdb
entries. In large scale setups, we have seen this to slow
down fdb dumps considerably. On a system with 30k macs we
see fdb dumps spanning across more than 300 skbs.

To fix the problem, this patch replaces the existing single fdb
marker with three markers: netdev hash entries, netdevs and fdb
index to continue where we left off instead of restarting from the
first netdev. This is consistent with link dumps.

In the process of fixing the performance issue, this patch also
re-implements fix done by
commit 472681d57a ("net: ndo_fdb_dump should report -EMSGSIZE to rtnl_fdb_dump")
(with an internal fix from Wilson Kok) in the following ways:
- change ndo_fdb_dump handlers to return error code instead
of the last fdb index
- use cb->args strictly for dump frag markers and not error codes.
This is consistent with other dump functions.

Below results were taken on a system with 1000 netdevs
and 35085 fdb entries:
before patch:
$time bridge fdb show | wc -l
15065

real    1m11.791s
user    0m0.070s
sys 1m8.395s

(existing code does not return all macs)

after patch:
$time bridge fdb show | wc -l
35085

real    0m2.017s
user    0m0.113s
sys 0m1.942s

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: Wilson Kok <wkok@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2016-09-01 16:56:15 -07:00
..
9p 9p: switch p9_client_read() to passing struct iov_iter * 2015-04-11 22:28:27 -04:00
bluetooth Bluetooth: Add debugfs fields for hardware and firmware info 2016-07-18 09:33:28 +03:00
caif caif: fix a signedness bug in cfpkt_iterate() 2015-02-20 17:35:14 -05:00
irda irda: Convert function pointer arrays and uses to const 2014-12-10 15:33:16 -05:00
iucv s390/iucv: do not use arrays as argument 2015-09-21 16:03:04 -07:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2016-07-24 22:02:36 -07:00
netns net: Remove fib_local variable 2016-08-09 14:57:39 -07:00
nfc NFC: digital: Add support for NFC DEP Response Waiting Time 2016-07-11 02:01:14 +02:00
phonet sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
sctp sctp: change to use TCP_CLOSE_WAIT as SCTP_SS_CLOSING 2016-08-01 13:32:50 -07:00
tc_act net_sched: act_vlan: Add priority option 2016-08-18 23:13:14 -07:00
6lowpan.h 6lowpan: add 802.15.4 short addr slaac 2016-06-15 20:41:22 -07:00
Space.h
…
act_api.h net_sched: convert tcf_exts from list to pointer array 2016-08-17 19:27:51 -04:00
addrconf.h ipv6: export several functions 2016-06-15 20:41:23 -07:00
af_ieee802154.h ieee802154: af_ieee802154: fix typo in comment. 2015-09-17 13:20:05 +02:00
af_rxrpc.h rxrpc: Don't expose skbs to in-kernel users [ver #2] 2016-09-01 16:43:27 -07:00
af_unix.h unix: correctly track in-flight fds in sending process user_struct 2016-02-08 10:30:42 -05:00
af_vsock.h VSOCK: Introduce virtio_vsock_common.ko 2016-08-02 02:57:29 +03:00
ah.h
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arp.h neigh: Factor out ___neigh_lookup_noref 2015-03-04 00:23:23 -05:00
atmclip.h
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ax25.h ax25: Stop using sock->sk_protinfo. 2015-06-28 16:55:44 -07:00
ax88796.h
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bond_3ad.h bonding: 3ad: apply ad_actor settings changes immediately 2016-02-09 04:45:49 -05:00
bond_alb.h
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bond_options.h bonding: convert num_grat_arp to the new bonding option API 2015-07-27 01:05:24 -07:00
bonding.h bonding: prevent out of bound accesses 2016-07-01 06:06:09 -04:00
busy_poll.h net: un-inline sk_busy_loop() 2015-11-18 16:17:38 -05:00
calipso.h calipso: Add a label cache. 2016-06-27 15:06:17 -04:00
cfg80211-wext.h
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cfg80211.h cfg80211: Add mesh peer AID setting API 2016-07-06 15:04:52 +02:00
cfg802154.h ieee802154: add netns support 2016-07-08 12:20:57 +02:00
checksum.h csum: Update csum_block_add to use rotate instead of byteswap 2016-03-13 15:01:00 -04:00
cipso_ipv4.h cipso: don't use IPCB() to locate the CIPSO IP option 2015-02-11 14:46:37 -05:00
cls_cgroup.h cls_cgroup: get sk_classid only from full sockets 2016-04-19 20:09:25 -04:00
codel.h codel: split into multiple files 2016-04-25 16:44:27 -04:00
codel_impl.h codel: split into multiple files 2016-04-25 16:44:27 -04:00
codel_qdisc.h net_sched: fq_codel: cache skb->truesize into skb->cb 2016-06-25 12:19:35 -04:00
compat.h packet: compat support for sock_fprog 2016-06-09 23:41:03 -07:00
datalink.h
…
dcbevent.h
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dcbnl.h net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
devlink.h devlink: remove unused priv_size 2016-08-26 11:55:18 -07:00
dn.h
…
dn_dev.h
…
dn_fib.h
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dn_neigh.h netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
dn_nsp.h
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dn_route.h
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dsa.h net: dsa: add MDB support 2016-08-31 14:15:42 -07:00
dsfield.h
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dst.h route: move lwtunnel state to a single place 2016-04-25 16:20:09 -04:00
dst_cache.h net: add dst_cache support 2016-02-16 20:21:48 -05:00
dst_metadata.h ip_tunnel: add support for setting flow label via collect metadata 2016-03-11 15:14:26 -05:00
dst_ops.h ipv4, ipv6: Pass net into __ip_local_out and __ip6_local_out 2015-10-08 04:27:02 -07:00
esp.h
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ethoc.h net/ethoc: support big-endian register layout 2015-09-23 15:33:15 -07:00
fib_rules.h net: Add l3mdev rule 2016-06-08 11:36:02 -07:00
firewire.h
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flow.h ipv6, trace: fix tos reporting on fib6_table_lookup 2016-03-20 13:44:34 -04:00
flow_dissector.h rps: flow_dissector: Add the const for the parameter of flow_keys_have_l4 2016-09-01 16:51:08 -07:00
flowcache.h
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fou.h fou: Add encap ops for IPv6 tunnels 2016-05-20 18:03:16 -04:00
fq.h fq: add fair queuing framework 2016-04-25 16:45:53 -04:00
fq_impl.h fq: split out backlog update logic 2016-04-28 17:03:38 -04:00
garp.h
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gen_stats.h net: sched: do not acquire qdisc spinlock in qdisc/class stats dump 2016-06-07 16:37:14 -07:00
genetlink.h Revert "genl: Add genlmsg_new_unicast() for unicast message allocation" 2016-02-18 11:42:19 -05:00
geneve.h net: Remove deprecated tunnel specific UDP offload functions 2016-06-17 20:23:32 -07:00
gre.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-08-18 01:17:32 -04:00
gro_cells.h gro_cells: gro_cells_receive now return error code 2016-07-22 00:50:41 -04:00
gtp.h gtp: #define #define _GTP_H_ and not #define _GTP_H 2016-07-25 17:55:43 -07:00
gue.h
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hwbm.h net: add a hardware buffer management helper API 2016-03-14 12:19:46 -04:00
icmp.h net: snmp: kill STATS_BH macros 2016-04-27 22:48:25 -04:00
ieee80211_radiotap.h
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ieee802154_netdev.h mac802154: constify ieee802154_llsec_ops structure 2016-01-04 20:40:41 +01:00
if_inet6.h ipv6: do retries on stable privacy addresses 2015-03-23 22:12:09 -04:00
ila.h ila: Add generic ILA translation facility 2015-12-15 23:25:20 -05:00
inet6_connection_sock.h ipv6: remove unused in6_addr struct 2016-03-22 15:45:44 -04:00
inet6_hashtables.h tcp/dccp: do not touch listener sk_refcnt under synflood 2016-04-04 22:11:20 -04:00
inet_common.h ip4ip6: Support for GSO/GRO 2016-05-20 18:03:17 -04:00
inet_connection_sock.h tcp/dccp: fix another race at listener dismantle 2016-02-18 11:35:51 -05:00
inet_ecn.h ipv6: suppress sparse warnings in IP6_ECN_set_ce() 2016-08-13 15:08:00 -07:00
inet_frag.h ipv4: namespacify ip fragment max dist sysctl knob 2016-02-16 20:42:54 -05:00
inet_hashtables.h tcp/dccp: do not touch listener sk_refcnt under synflood 2016-04-04 22:11:20 -04:00
inet_sock.h ipv6: Allow request socks to contain IPv6 options. 2016-06-27 15:05:28 -04:00
inet_timewait_sock.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-20 06:08:27 -07:00
inetpeer.h inet: tcp: fix inetpeer_set_addr_v4() 2015-12-16 00:14:12 -05:00
ip.h net/ipv4: Introduce IPSKB_FRAG_SEGS bit to inet_skb_parm.flags 2016-07-19 16:40:22 -07:00
ip6_checksum.h ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
ip6_fib.h ipv6: Check rt->dst.from for the DST_NOCACHE route 2015-11-15 17:12:37 -05:00
ip6_route.h net: ipv6: Move ip6_route_get_saddr to inline 2016-06-17 21:25:29 -07:00
ip6_tunnel.h ipv6: hide ip6_encap_hlen/ip6_tnl_encap definitions 2016-05-29 22:24:21 -07:00
ip_fib.h route: check and remove route cache when we get route 2016-02-18 11:31:36 -05:00
ip_tunnels.h gre: better support for ICMP messages for gre+ipv6 2016-06-18 22:11:39 -07:00
ip_vs.h ipvs: update real-server binding of outgoing connections in SIP-pe 2016-06-06 09:47:25 +09:00
ipcomp.h
…
ipconfig.h
…
ipv6.h Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/selinux into next 2016-07-07 10:15:34 +10:00
ipx.h switch ipxrtr_route_packet() from iovec to msghdr 2014-11-24 04:28:49 -05:00
iw_handler.h cfg80211/wext: fix message ordering 2016-01-29 17:13:43 +01:00
kcm.h kcm: Use stream parser 2016-08-17 19:36:23 -04:00
l3mdev.h net: ipv6: Address selection needs to consider L3 domains 2016-06-17 21:25:29 -07:00
lapb.h
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lib80211.h
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llc.h
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llc_c_ac.h
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llc_c_ev.h
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llc_c_st.h llc: Make llc_conn_ev_qfyr_t function pointer arrays const 2014-12-10 15:21:24 -05:00
llc_conn.h net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
llc_if.h
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llc_pdu.h
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llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h llc: Make llc_sap_action_t function pointer arrays const 2014-12-10 15:21:24 -05:00
llc_sap.h
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lwtunnel.h net: lwtunnel: Handle fragmentation 2016-08-30 22:27:18 -07:00
mac80211.h mac80211: Add ieee80211_hw pointer to get_expected_throughput 2016-08-05 14:23:25 +02:00
mac802154.h ieee802154: cleanup WARN_ON for fc fetch 2016-07-08 13:23:12 +02:00
mip6.h
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mld.h
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mpls.h
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mpls_iptunnel.h mpls: multipath route support 2015-10-23 06:26:42 -07:00
mrp.h
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ncsi.h net/ncsi: Package and channel management 2016-07-19 20:49:17 -07:00
ndisc.h 6lowpan: introduce 6lowpan-nd 2016-06-15 20:41:23 -07:00
neighbour.h net: add explicit logging and stat for neighbour table overflow 2015-08-10 13:46:21 -07:00
net_namespace.h treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
net_ratelimit.h
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netevent.h neigh: Send a notification when DELAY_PROBE_TIME changes 2016-07-05 09:06:29 -07:00
netlabel.h netlabel: Implement CALIPSO config functions for SMACK. 2016-06-27 15:06:18 -04:00
netlink.h netlink: kill nla_put_u64() 2016-05-16 13:46:23 -04:00
netprio_cgroup.h net: wrap sock->sk_cgrp_prioidx and ->sk_classid inside a struct 2015-12-08 22:02:33 -05:00
netrom.h
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nexthop.h
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nl802154.h ieee802154: add netns support 2016-07-08 12:20:57 +02:00
p8022.h
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ping.h net: ping: make ping_v6_sendmsg static 2016-03-23 22:09:58 -04:00
pkt_cls.h net_sched: properly handle failure case of tcf_exts_init() 2016-08-22 17:02:31 -07:00
pkt_sched.h net: sched: convert qdisc linked list to hashtable 2016-08-10 17:19:02 -07:00
pptp.h pptp: Refactor the struct and macros of PPTP codes 2016-08-15 10:55:53 -07:00
protocol.h udp: Remove udp_offloads 2016-04-07 16:53:30 -04:00
psnap.h
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raw.h sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
rawv6.h
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red.h
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regulatory.h cfg80211: allow wiphy specific regdomain management 2014-12-17 11:49:55 +01:00
request_sock.h inet: reqsk_alloc() needs to take care of dead listeners 2016-04-04 22:11:19 -04:00
rose.h
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route.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-04-23 18:51:33 -04:00
rtnetlink.h net: rtnetlink: add support for the IFLA_STATS_LINK_XSTATS_SLAVE attribute 2016-06-30 06:15:04 -04:00
sch_generic.h net: minor optimization in qdisc_qstats_cpu_drop() 2016-08-25 16:45:29 -07:00
scm.h unix: correctly track in-flight fds in sending process user_struct 2016-02-08 10:30:42 -05:00
secure_seq.h
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slhc_vj.h
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snmp.h net: snmp: fix 64bit stats on 32bit arches 2016-04-28 11:49:45 -04:00
sock.h net: remove clear_sk() method 2016-08-23 23:25:29 -07:00
sock_reuseport.h soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind 2016-01-19 14:44:23 -05:00
stp.h
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strparser.h kcm: Remove TCP specific references from kcm and strparser 2016-08-28 23:32:41 -04:00
switchdev.h rtnetlink: fdb dump: optimize by saving last interface markers 2016-09-01 16:56:15 -07:00
tcp.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-08-30 00:54:02 -04:00
tcp_states.h inet: add TCP_NEW_SYN_RECV state 2015-03-12 22:58:12 -04:00
timewait_sock.h inet: remove BUG_ON() in twsk_destructor() 2015-07-09 15:12:20 -07:00
transp_v6.h ipv6: add new struct ipcm6_cookie 2016-05-03 16:08:14 -04:00
tso.h net: tso: add support for IPv6 2015-10-26 22:24:22 -07:00
udp.h net: diag: support SOCK_DESTROY for UDP sockets 2016-08-23 23:12:27 -07:00
udp_tunnel.h vxlan: Add new UDP encapsulation offload type for VXLAN-GPE 2016-06-17 20:23:32 -07:00
udplite.h net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter() 2015-02-04 01:34:15 -05:00
vsock_addr.h
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vxlan.h net: Remove deprecated tunnel specific UDP offload functions 2016-06-17 20:23:32 -07:00
wext.h
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wimax.h
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x25.h
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x25device.h
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xfrm.h net: xfrm: kill XFRM_INC_STATS_BH() 2016-04-27 22:48:23 -04:00