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Paolo Abeni 911362c70d net: add dst_cache support 
This patch add a generic, lockless dst cache implementation.
The need for lock is avoided updating the dst cache fields
only in per cpu scope, and requiring that the cache manipulation
functions are invoked with the local bh disabled.

The refresh_ts and reset_ts fields are used to ensure the cache
consistency in case of cuncurrent cache update (dst_cache_set*) and
reset operation (dst_cache_reset).

Consider the following scenario:

CPU1:                                   	CPU2:
  <cache lookup with emtpy cache: it fails>
  <get dst via uncached route lookup>
						<related configuration changes>
                                        	dst_cache_reset()
  dst_cache_set()

The dst entry set passed to dst_cache_set() should not be used
for later dst cache lookup, because it's obtained using old
configuration values.

Since the refresh_ts is updated only on dst_cache lookup, the
cached value in the above scenario will be discarded on the next
lookup.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Suggested-and-acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2016-02-16 20:21:48 -05:00
..
6lowpan 6lowpan: fix debugfs interface entry name 2015-12-20 08:21:00 +01:00
9p Rework and error handling fixes, primarily in the fscatch and fd transports. 2016-01-24 12:39:09 -08:00
802
…
8021q net: Rename NETIF_F_ALL_CSUM to NETIF_F_CSUM_MASK 2015-12-15 16:50:08 -05:00
appletalk
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atm net: Generalise wq_has_sleeper helper 2015-11-30 14:47:33 -05:00
ax25 net: add validation for the socket syscall protocol argument 2015-12-14 16:09:30 -05:00
batman-adv batman-adv: Convert batadv_tt_common_entry to kref 2016-02-10 23:24:06 +08:00
bluetooth Bluetooth: Fix incorrect removing of IRKs 2016-01-29 11:47:24 +01:00
bridge bridge: mdb: Passing the port-group pointer to br_mdb module 2016-02-09 04:42:47 -05:00
caif net: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA 2015-12-01 15:45:05 -05:00
can can: avoid using timeval for uapi 2015-10-13 17:42:34 +02:00
ceph libceph: remove outdated comment 2016-01-21 19:36:09 +01:00
core net: add dst_cache support 2016-02-16 20:21:48 -05:00
dcb net/dcb: make dcbnl.c explicitly non-modular 2015-10-09 07:52:27 -07:00
dccp inet: refactor inet[6]_lookup functions to take skb 2016-02-11 03:54:14 -05:00
decnet net: add validation for the socket syscall protocol argument 2015-12-14 16:09:30 -05:00
dns_resolver net: dns_resolver: convert time_t to time64_t 2015-11-18 16:27:46 -05:00
dsa dsa: Register netdev before phy 2016-01-07 14:31:26 -05:00
ethernet net: Add eth_platform_get_mac_address() helper. 2016-01-06 16:31:56 -05:00
hsr net/hsr: fix a warning message 2015-11-23 14:56:15 -05:00
ieee802154 sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
ipv4 net: ip_tunnel: remove 'csum_help' argument to iptunnel_handle_offloads 2016-02-12 05:52:16 -05:00
ipv6 net: ip_tunnel: remove 'csum_help' argument to iptunnel_handle_offloads 2016-02-12 05:52:16 -05:00
ipx
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irda irda: fix a potential use-after-free in ircomm_param_request 2016-01-29 22:56:46 -08:00
iucv af_iucv: Validate socket address length in iucv_sock_bind() 2016-01-19 14:21:08 -05:00
key af_key: fix two typos 2015-10-23 03:05:19 -07:00
l2tp inet: create IPv6-equivalent inet_hash function 2016-02-11 03:54:14 -05:00
l3mdev net: Add netif_is_l3_slave 2015-10-07 04:27:43 -07:00
lapb
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llc tcp: fix recv with flags MSG_WAITALL | MSG_PEEK 2015-07-27 01:06:53 -07:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-02-01 15:56:08 -08:00
mac802154 mac802154: constify ieee802154_llsec_ops structure 2016-01-04 20:40:41 +01:00
mpls Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-12-17 22:08:28 -05:00
netfilter net: ip_tunnel: remove 'csum_help' argument to iptunnel_handle_offloads 2016-02-12 05:52:16 -05:00
netlabel
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netlink openvswitch: allow management from inside user namespaces 2016-02-11 09:53:19 -05:00
netrom netfilter: Remove spurios included of netfilter.h 2015-06-18 21:14:32 +02:00
nfc NFC 4.5 pull request 2016-01-04 21:48:15 -05:00
openvswitch openvswitch: allow management from inside user namespaces 2016-02-11 09:53:19 -05:00
packet packet: tpacket_snd gso and checksum offload 2016-02-09 06:43:50 -05:00
phonet sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
rds rds: duplicate include net/tcp.h 2016-02-11 09:45:24 -05:00
rfkill rfkill: fix rfkill_fop_read wait_event usage 2016-01-26 11:32:05 +01:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-01-12 18:57:02 -08:00
sched net_sched: drr: check for NULL pointer in drr_dequeue 2016-01-29 17:26:44 -08:00
sctp sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
sunrpc Initial roundup of 4.5 merge window patches 2016-01-23 18:45:06 -08:00
switchdev switchdev: Require RTNL mutex to be held when sending FDB notifications 2016-01-28 16:21:31 -08:00
tipc tipc: refactor node xmit and fix memory leaks 2016-02-16 15:58:40 -05:00
unix net: drop write-only stack variable 2016-02-07 14:06:26 -05:00
vmw_vsock Revert "Merge branch 'vsock-virtio'" 2015-12-08 21:55:49 -05:00
wimax net:wimax: Fix doucble word "the the" in networking.xml 2015-08-09 22:43:52 -07:00
wireless regulatory: fix world regulatory domain data 2016-01-14 11:10:13 +01:00
x25
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xfrm net: preserve IP control block during GSO segmentation 2016-01-15 14:35:24 -05:00
Kconfig net: add dst_cache support 2016-02-16 20:21:48 -05:00
Makefile net: Introduce L3 Master device abstraction 2015-09-29 20:40:32 -07:00
compat.c
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socket.c kmemcg: account certain kmem allocations to memcg 2016-01-14 16:00:49 -08:00
sysctl_net.c net: sysctl: fix a kmemleak warning 2015-10-23 06:22:08 -07:00