Ido Schimmel c3852ef7f2 ipv4: fib: Replay events when registering FIB notifier ... Commit b90eb75494 ("fib: introduce FIB notification infrastructure") introduced a new notification chain to notify listeners (f.e., switchdev drivers) about addition and deletion of routes. However, upon registration to the chain the FIB tables can already be populated, which means potential listeners will have an incomplete view of the tables. Solve that by dumping the FIB tables and replaying the events to the passed notification block. The dump itself is done using RCU in order not to starve consumers that need RTNL to make progress. The integrity of the dump is ensured by reading the FIB change sequence counter before and after the dump under RTNL. This allows us to avoid the problematic situation in which the dumping process sends a ENTRY_ADD notification following ENTRY_DEL generated by another process holding RTNL. Callers of the registration function may pass a callback that is executed in case the dump was inconsistent with current FIB tables. The number of retries until a consistent dump is achieved is set to a fixed number to prevent callers from looping for long periods of time. In case current limit proves to be problematic in the future, it can be easily converted to be configurable using a sysctl. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-12-03 19:29:35 -05:00
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acpi	Merge branches 'acpica-fixes', 'acpi-cppc-fixes' and 'acpi-tools-fixes'	2016-11-18 21:34:42 +01:00
asm-generic	default exported asm symbols to zero	2016-12-02 08:51:22 -08:00
clocksource
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2016-10-10 11:19:47 +08:00
drm	drm: Don't force all planes to be added to the state due to zpos	2016-10-26 18:48:05 +02:00
dt-bindings	dt-bindings: net: add EEE capability constants	2016-11-29 19:38:31 -05:00
keys
kvm
linux	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-03 12:29:53 -05:00
math-emu
media	Linux 4.8	2016-10-05 16:43:53 -03:00
memory
misc
net	ipv4: fib: Replay events when registering FIB notifier	2016-12-03 19:29:35 -05:00
pcmcia
ras
rdma	Merge of primary rdma-core code for 4.9	2016-10-09 17:04:33 -07:00
rxrpc
scsi
soc	powerpc updates for 4.9 #2	2016-10-14 11:07:42 -07:00
sound
target	target: Make EXTENDED_COPY 0xe4 failure return COPY TARGET DEVICE NOT REACHABLE	2016-10-19 21:22:32 -07:00
trace	net/phy: add trace events for mdio accesses	2016-11-24 11:55:43 -05:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-03 12:29:53 -05:00
video	fbdev changes for 4.9	2016-10-12 11:01:37 -07:00
xen	xen: features and fixes for 4.9-rc0	2016-10-06 11:19:10 -07:00
Kbuild