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66f5d6ce53
linux/include/net
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Wei Wang 66f5d6ce53 ipv6: replace rwlock with rcu and spinlock in fib6_table 
With all the preparation work before, we are now ready to replace rwlock
with rcu and spinlock in fib6_table.
That means now all fib6_node in fib6_table are protected by rcu. And
when freeing fib6_node, call_rcu() is used to wait for the rcu grace
period before releasing the memory.
When accessing fib6_node, corresponding rcu APIs need to be used.
And all previous sessions protected by the write lock will now be
protected by the spin lock per table.
All previous sessions protected by read lock will now be protected by
rcu_read_lock().

A couple of things to note here:
1. As part of the work of replacing rwlock with rcu, the linked list of
fn->leaf now has to be rcu protected as well. So both fn->leaf and
rt->dst.rt6_next are now __rcu tagged and corresponding rcu APIs are
used when manipulating them.

2. For fn->rr_ptr, first of all, it also needs to be rcu protected now
and is tagged with __rcu and rcu APIs are used in corresponding places.
Secondly, fn->rr_ptr is changed in rt6_select() which is a reader
thread. This makes the issue a bit complicated. We think a valid
solution for it is to let rt6_select() grab the tb6_lock if it decides
to change it. As it is not in the normal operation and only happens when
there is no valid neighbor cache for the route, we think the performance
impact should be low.

3. fib6_walk_continue() has to be called with tb6_lock held even in the
route dumping related functions, e.g. inet6_dump_fib(),
fib6_tables_dump() and ipv6_route_seq_ops. It is because
fib6_walk_continue() makes modifications to the walker structure, and so
are fib6_repair_tree() and fib6_del_route(). In order to do proper
syncing between them, we need to let fib6_walk_continue() hold the lock.
We may be able to do further improvement on the way we do the tree walk
to get rid of the need for holding the spin lock. But not for now.

4. When fib6_del_route() removes a route from the tree, we no longer
mark rt->dst.rt6_next to NULL to make simultaneous reader be able to
further traverse the list with rcu. However, rt->dst.rt6_next is only
valid within this same rcu period. No one should access it later.

5. All the operation of atomic_inc(rt->rt6i_ref) is changed to be
performed before we publish this route (either by linking it to fn->leaf
or insert it in the list pointed by fn->leaf) just to be safe because as
soon as we publish the route, some read thread will be able to access it.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-07 21:22:58 +01:00
..
9p 9p: Implement show_options 2017-07-11 06:08:58 -04:00
bluetooth Bluetooth: make baswap src const 2017-09-01 22:49:47 +02:00
caif
iucv s390/iucv: do not use arrays as argument 2015-09-21 16:03:04 -07:00
netfilter netfilter: nat: Revert "netfilter: nat: convert nat bysrc hash to rhashtable" 2017-09-08 18:55:50 +02:00
netns ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob 2017-10-01 17:55:54 -07:00
nfc NFC: Add nfc_dbg() macro 2017-04-05 10:15:20 +02:00
phonet sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
sctp sctp: introduce round robin stream scheduler 2017-10-03 16:27:29 -07:00
tc_act net: sched: introduce helper to identify gact pass action 2017-09-26 20:26:45 -07:00
6lowpan.h 6lowpan: Fix IID format for Bluetooth 2017-04-12 22:02:36 +02:00
act_api.h net_sched: get rid of tcfa_rcu 2017-09-12 20:41:02 -07:00
addrconf.h net: Convert int functions to bool 2017-09-18 11:40:03 -07:00
af_ieee802154.h ieee802154: af_ieee802154: fix typo in comment. 2015-09-17 13:20:05 +02:00
af_rxrpc.h rxrpc: Allow failed client calls to be retried 2017-08-29 10:55:20 +01:00
af_unix.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-07-21 03:38:43 +01:00
af_vsock.h VSOCK: use TCP state constants for sk_state 2017-10-05 18:44:17 -07:00
ah.h
arp.h net: convert neighbour.refcnt from atomic_t to refcount_t 2017-07-01 07:39:07 -07:00
atmclip.h
ax25.h net, ax25: convert ax25_cb.refcount from atomic_t to refcount_t 2017-07-04 22:35:19 +01:00
ax88796.h
bond_3ad.h bonding: 3ad: apply ad_actor settings changes immediately 2016-02-09 04:45:49 -05:00
bond_alb.h
bond_options.h bonding: Prevent duplicate userspace notification 2017-05-27 18:51:41 -04:00
bonding.h net: Add extack to ndo_add_slave 2017-10-04 21:39:33 -07:00
busy_poll.h net: fix compilation when busy poll is not enabled 2017-08-11 14:59:24 -07:00
calipso.h net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
cfg80211-wext.h
cfg80211.h nl80211: add authorized flag to ROAM event 2017-06-13 11:04:37 +02:00
cfg802154.h ieee802154: add netns support 2016-07-08 12:20:57 +02:00
checksum.h csum: eliminate sparse warning in remcsum_unadjust() 2017-01-20 12:12:13 -05:00
cipso_ipv4.h net, ipv4: convert cipso_v4_doi.refcount from atomic_t to refcount_t 2017-07-04 01:29:04 -07:00
cls_cgroup.h cls_cgroup: get sk_classid only from full sockets 2016-04-19 20:09:25 -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
codel.h codel: split into multiple files 2016-04-25 16:44:27 -04:00
compat.h packet: compat support for sock_fprog 2016-06-09 23:41:03 -07:00
datalink.h
dcbevent.h
dcbnl.h
devlink.h devlink: Add IPv6 header for dpipe 2017-08-31 14:42:19 -07:00
dn_dev.h
dn_fib.h net, decnet: convert dn_fib_info.fib_clntref from atomic_t to refcount_t 2017-07-04 22:35:15 +01:00
dn_neigh.h netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
dn_nsp.h
dn_route.h
dn.h
dsa.h net: dsa: remove tag ops from the switch tree 2017-10-01 04:15:07 +01:00
dsfield.h
dst_cache.h net: add dst_cache support 2016-02-16 20:21:48 -05:00
dst_metadata.h net/dst: Make skb parameter of skb{metadata_dst, tunnel_info}() const 2017-10-02 11:06:07 -07:00
dst_ops.h net: add confirm_neigh method to dst_ops 2017-02-07 13:07:46 -05:00
dst.h ipv6: replace rwlock with rcu and spinlock in fib6_table 2017-10-07 21:22:58 +01:00
erspan.h gre: introduce native tunnel support for ERSPAN 2017-08-22 14:29:30 -07:00
esp.h esp6: Reorganize esp_output 2017-04-14 10:06:42 +02:00
ethoc.h net/ethoc: support big-endian register layout 2015-09-23 15:33:15 -07:00
fib_notifier.h fib: notifier: Add VIF add and delete event types 2017-09-27 11:33:27 -07:00
fib_rules.h net: fib_rules: Implement notification logic in core 2017-08-03 15:35:59 -07:00
firewire.h
flow_dissector.h flow_dissector: Cleanup control flow 2017-09-05 11:40:08 -07:00
flow.h net: Extend struct flowi6 with multipath hash 2017-08-24 18:21:17 -07:00
fou.h fou: Add encap ops for IPv6 tunnels 2016-05-20 18:03:16 -04:00
fq_impl.h fq.h: Port memory limit mechanism from fq_codel 2016-09-30 13:29:21 +02:00
fq.h fq.h: Port memory limit mechanism from fq_codel 2016-09-30 13:29:21 +02:00
garp.h
gen_stats.h net_sched: gen_estimator: complete rewrite of rate estimators 2016-12-05 15:21:59 -05:00
genetlink.h genetlink: remove ops_list from genetlink header. 2017-06-05 10:54:55 -04:00
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: move to net/core/gro_cells.c 2017-02-08 14:38:18 -05:00
gtp.h gtp: #define #define _GTP_H_ and not #define _GTP_H 2016-07-25 17:55:43 -07:00
gue.h
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 wireless: radiotap: rewrite the radiotap header file 2017-01-25 16:00:33 +01:00
ieee802154_netdev.h mac802154: constify ieee802154_llsec_ops structure 2016-01-04 20:40:41 +01:00
if_inet6.h net, ipv6: convert ifacaddr6.aca_refcnt from atomic_t to refcount_t 2017-07-04 01:29:04 -07:00
ife.h net: Introduce ife encapsulation module 2017-02-03 15:16:45 -05:00
ila.h ila: Add generic ILA translation facility 2015-12-15 23:25:20 -05:00
inet6_connection_sock.h inet: drop ->bind_conflict 2017-01-18 13:04:28 -05:00
inet6_hashtables.h net: ipv6: add second dif to inet6 socket lookups 2017-08-07 11:39:22 -07:00
inet_common.h net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
inet_connection_sock.h tcp: ULP infrastructure 2017-06-15 12:12:40 -04:00
inet_ecn.h net-ipv6: remove unused IP6_ECN_clear() function 2017-10-01 17:55:54 -07:00
inet_frag.h Revert "net: fix percpu memory leaks" 2017-09-03 11:01:05 -07:00
inet_hashtables.h net: ipv4: add second dif to inet socket lookups 2017-08-07 11:39:21 -07:00
inet_sock.h net/tcp-fastopen: Add new API support 2017-01-25 14:04:38 -05:00
inet_timewait_sock.h ipv4: Namespaceify tcp_tw_recycle and tcp_max_tw_buckets knob 2016-12-29 11:38:31 -05:00
inetpeer.h inetpeer: remove AVL implementation in favor of RB tree 2017-07-17 08:59:01 -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: replace rwlock with rcu and spinlock in fib6_table 2017-10-07 21:22:58 +01:00
ip6_route.h ipv6: prepare fib6_age() for exception table 2017-10-07 21:22:57 +01:00
ip6_tunnel.h ip6_tunnel: Allow policy-based routing through tunnels 2017-04-21 13:21:30 -04:00
ip_fib.h net: ipv4: remove fib_weight 2017-09-29 06:19:32 +01:00
ip_tunnels.h ipv4: speedup ipv6 tunnels dismantle 2017-09-19 16:32:24 -07:00
ip_vs.h ipvs: remove unused function ip_vs_set_state_timeout 2017-04-28 12:00:10 +02:00
ip.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-08-21 17:06:42 -07:00
ipcomp.h
ipconfig.h
ipv6.h net/ipv6: Convert icmpv6_push_pending_frames to void 2017-10-06 09:52:31 -07:00
ipx.h net, ipx: convert ipx_route.refcnt from atomic_t to refcount_t 2017-07-04 22:35:17 +01:00
iw_handler.h wext: uninline stream addition functions 2017-01-13 09:38:42 +01:00
kcm.h kcm: Use stream parser 2016-08-17 19:36:23 -04:00
l3mdev.h net: ipv4: Do not drop to make_route if oif is l3mdev 2016-10-13 12:05:26 -04:00
lapb.h net, lapb: convert lapb_cb.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
lib80211.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
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
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h net, llc: convert llc_sap.refcnt from atomic_t to refcount_t 2017-07-04 22:35:15 +01:00
lwtunnel.h net: add extack arg to lwtunnel build state 2017-05-30 11:55:32 -04:00
mac80211.h mac80211: fix VLAN handling with TXQs 2017-09-05 11:28:43 +02:00
mac802154.h ieee802154: cleanup WARN_ON for fc fetch 2016-07-08 13:23:12 +02:00
mip6.h
mld.h
mpls_iptunnel.h net: mpls: Increase max number of labels for lwt encap 2017-04-01 20:21:44 -07:00
mpls.h openvswitch: use mpls_hdr 2016-10-03 02:00:22 -04:00
mrp.h
ncsi.h net/ncsi: fix ncsi_vlan_rx_{add,kill}_vid references 2017-09-05 09:11:45 -07:00
ndisc.h net: convert neighbour.refcnt from atomic_t to refcount_t 2017-07-01 07:39:07 -07:00
neighbour.h neigh: make strucrt neigh_table::entry_size unsigned int 2017-09-25 20:36:17 -07:00
net_namespace.h net: core: Make the FIB notification chain generic 2017-08-03 15:35:59 -07:00
net_ratelimit.h
netevent.h neigh: Send a notification when DELAY_PROBE_TIME changes 2016-07-05 09:06:29 -07:00
netlabel.h net: convert netlbl_lsm_cache.refcount from atomic_t to refcount_t 2017-07-01 07:39:09 -07:00
netlink.h netlink: fix nla_put_{u8,u16,u32} for KASAN 2017-09-25 20:18:27 -07:00
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 net, netrom: convert nr_node.refcount from atomic_t to refcount_t 2017-07-04 22:35:17 +01:00
nexthop.h
nl802154.h ieee802154: add netns support 2016-07-08 12:20:57 +02:00
nsh.h net: add NSH header structures and helpers 2017-08-29 15:16:52 -07:00
p8022.h
ping.h net: ping: make ping_v6_sendmsg static 2016-03-23 22:09:58 -04:00
pkt_cls.h net: sched: remove cops->tcf_cl_offload 2017-08-11 13:47:01 -07:00
pkt_sched.h net: sched: Add helpers to identify classids 2017-08-11 13:47:00 -07:00
pptp.h pptp: Refactor the struct and macros of PPTP codes 2016-08-15 10:55:53 -07:00
protocol.h IPv4: early demux can return an error code 2017-10-01 03:55:47 +01:00
psample.h net: Introduce psample, a new genetlink channel for packet sampling 2017-01-24 13:44:28 -05:00
psnap.h
raw.h net: ipv4: add second dif to raw socket lookups 2017-08-07 11:39:21 -07:00
rawv6.h net: ipv6: add second dif to raw socket lookups 2017-08-07 11:39:22 -07:00
red.h ktime: Get rid of the union 2016-12-25 17:21:22 +01:00
regulatory.h
request_sock.h net: convert sock.sk_refcnt from atomic_t to refcount_t 2017-07-01 07:39:08 -07:00
rose.h
route.h udp: perform source validation for mcast early demux 2017-10-01 03:55:47 +01:00
rtnetlink.h rtnetlink: remove __rtnl_af_unregister 2017-10-04 10:33:59 -07:00
sch_generic.h net_sched: no need to free qdisc in RCU callback 2017-09-19 16:30:03 -07:00
scm.h sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h> 2017-03-02 08:42:31 +01:00
secure_seq.h tcp: Namespaceify sysctl_tcp_timestamps 2017-06-08 10:53:29 -04:00
seg6_hmac.h ipv6: sr: add core files for SR HMAC support 2016-11-09 20:40:06 -05:00
seg6.h ipv6: sr: add support for ip4ip6 encapsulation 2017-08-25 17:10:23 -07:00
slhc_vj.h
smc.h smc: netlink interface for SMC sockets 2017-01-09 16:07:41 -05:00
snmp.h net: snmp: fix 64bit stats on 32bit arches 2016-04-28 11:49:45 -04:00
sock_reuseport.h soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind 2016-01-19 14:44:23 -05:00
sock.h tcp: implement rb-tree based retransmit queue 2017-10-07 00:28:54 +01:00
Space.h
stp.h
strparser.h strparser: initialize all callbacks 2017-08-24 21:57:50 -07:00
switchdev.h net: switchdev: Remove bridge bypass support from switchdev 2017-08-07 14:48:48 -07:00
tcp_states.h
tcp.h tcp: implement rb-tree based retransmit queue 2017-10-07 00:28:54 +01:00
timewait_sock.h inet: remove BUG_ON() in twsk_destructor() 2015-07-09 15:12:20 -07:00
tls.h tls: kernel TLS support 2017-06-15 12:12:40 -04:00
transp_v6.h ipv6: add new struct ipcm6_cookie 2016-05-03 16:08:14 -04:00
tso.h net: define the TSO header size in net/tso.h 2017-08-23 20:42:09 -07:00
tun_proto.h vxlan: factor out VXLAN-GPE next protocol 2017-08-29 15:16:52 -07:00
udp_tunnel.h net: add infrastructure to un-offload UDP tunnel port 2017-07-24 13:52:59 -07:00
udp.h IPv4: early demux can return an error code 2017-10-01 03:55:47 +01:00
udplite.h udp: use a separate rx queue for packet reception 2017-05-16 15:41:29 -04:00
vsock_addr.h
vxlan.h vxlan: factor out VXLAN-GPE next protocol 2017-08-29 15:16:52 -07:00
wext.h dev_ioctl: copy only the smaller struct iwreq for wext 2017-06-14 13:52:44 +02:00
wimax.h
x25.h net, x25: convert x25_neigh.refcnt from atomic_t to refcount_t 2017-07-04 22:35:18 +01:00
x25device.h
xfrm.h xfrm: Add support for network devices capable of removing the ESP trailer 2017-08-31 09:04:03 +02:00