Maria Matejka [Thu, 19 Jan 2023 09:49:47 +0000 (10:49 +0100)]
Decoupling loops from threads to allow fixed thread count
On large configurations, too many threads would spawn with one thread
per loop. Therefore, threads may now run multiple loops at once. The
thread count is configurable and may be changed during run. All threads
are spawned on startup.
This change helps with memory bloating. BIRD filters need large
temporary memory blocks to store their stack and also memory management
keeps its hot page storage per-thread.
Known bugs:
* Thread autobalancing is not yet implemented.
* Low latency loops are executed together with standard loops.
Maria Matejka [Thu, 19 Jan 2023 09:56:16 +0000 (10:56 +0100)]
Table prune routine doesn't walk over lists unless needed.
If no channel is flushing, table prune doesn't walk over routes in nets
and also doesn't walk over importing channel lists. This helps to
alleviate the memory caching burdens a lot.
Maria Matejka [Thu, 19 Jan 2023 09:53:09 +0000 (10:53 +0100)]
CLI closing fix when its action is run asynchronously.
Some CLI actions, notably "show route", are run by queuing an event
somewhere else. If the user closes the socket, in case such an action is
being executed, the CLI must free the socket immediately from the error
hook but the pool must remain until the asynchronous event finishes and
cleans everything up.
Ondrej Zajicek [Fri, 9 Dec 2022 21:43:27 +0000 (22:43 +0100)]
Doc: Document issue with import tables
The import table does not work reliably together with re-evaluation of
routes due to recursive next hops or flowspec validation. We will at
least document that here, as import tables are completely redesigned and
this issue is fixed in BIRD 3.x branch.
Netlink support was added to FreeBSD recently. It is not as full-featured
as its Linux counterpart yet, however the added subset is enough to make
a routing daemon work. Specifically, it supports multiple tables,
multipath, nexthops and nexthops groups. No MPLS support yet.
The attached change adds 'bsd-netlink’ sysconf target, allowing to build
both netlink & rtsock versions on FreeBSD.
Ondrej Zajicek [Fri, 9 Dec 2022 04:51:30 +0000 (05:51 +0100)]
BGP: Improve handling of hold and keepalive timers
The effective keepalive time now scales relative to the negotiated
hold time, to maintain proportion between the keepalive time and the
hold time. This avoids issues when both keepalive and hold times
were configured, the hold time was negotiated to a smaller value,
but the keepalive time stayed the same.
Add new options 'min hold time' and 'min keepalive time', which reject
session attempts with too small hold time.
Improve validation of config options an their documentation.
Thanks to Alexander Zubkov and Sergei Goriunov for suggestions.
Ondrej Zajicek [Tue, 6 Dec 2022 18:40:02 +0000 (19:40 +0100)]
Nest: Avoid spurious announcements triggered by filtered routes
When filtered routes (enabled by 'import keep filtered' option) are
updated, they trigger announcements by rte_announce(). For regular
channels (e.g. type RA_OPTIMAL or RA_ANY) such announcement is just
ignored, but in case of RA_ACCEPTED (BGP peer with 'secondary' option)
it just reannounces the old (and still valid) best route.
The patch ensures that such no-change is ignored even for these channels.
Ondrej Zajicek [Wed, 9 Nov 2022 20:09:16 +0000 (21:09 +0100)]
Conf: Free stored old config before parsing new one
BIRD keeps a previous (old) configuration for the purpose of undo. The
existing code frees it after a new configuration is successfully parsed
during reconfiguration. That causes memory usage spikes as there are
temporarily three configurations (old, current, and new). The patch
changes it to free the old one before parsing the new one (as user
already requested a new config). The disadvantage is that undo is
not available after failed reconfiguration.
Maria Matejka [Tue, 1 Nov 2022 17:40:56 +0000 (18:40 +0100)]
Memory pages are not munmapped, instead we just madvise()
Memory unmapping causes slow address space fragmentation, leading in
extreme cases to failing to allocate pages at all. Removing this problem
by keeping all the pages allocated to us, yet calling madvise() to let
kernel dispose of them.
This adds a little complexity and overhead as we have to keep the
pointers to the free pages, therefore to hold e.g. 1 GB of 4K pages with
8B pointers, we have to store 2 MB of data.
Ondrej Zajicek [Tue, 18 Oct 2022 01:58:19 +0000 (03:58 +0200)]
Filter: Fix handling of variables in anonymous filters
Define scope for anonymous filters, and also explicitly distinguish block
scopes and function/filter scopes instead of using anonymous / named
distinction.
Anonymous filters forgot to push scope, so variables for them were in
fact defined in the top scope and therefore they shared a frame. This got
broken after rework of variables, which assumed that there is a named
scope for every function/filter.
Ondrej Zajicek [Wed, 12 Oct 2022 15:57:26 +0000 (17:57 +0200)]
Netlink: Parse onlink flag even on direct routes
While onlink flag is meaningful only with explicit next hops, it can be
defined also on direct routes. Parse it also in this case to avoid
periodic updates of the same route.
Ondrej Zajicek [Mon, 10 Oct 2022 03:06:19 +0000 (05:06 +0200)]
BGP: Add option 'next hop prefer global'
Add BGP channel option 'next hop prefer global' that modifies BGP
recursive next hop resolution to use global next hop IPv6 address instead
of link-local next hop IPv6 address for immediate next hop of received
routes.
Ondrej Zajicek [Mon, 3 Oct 2022 16:53:21 +0000 (18:53 +0200)]
Nest: Add channel config flag to distinguish new or copy
It is useful to distinguish whehter channel config returned from
channel_config_get() was allocated new, or existing from template.
Caller may want to initialize new ones.
Ondrej Zajicek [Thu, 8 Sep 2022 17:41:02 +0000 (19:41 +0200)]
BGP: Do not assume that all channels are struct bgp_channel
In principle, the channel list is a list of parent struct proto and can
contain general structures of type struct channel, That is useful e.g.
for adding MPLS channels to BGP.
Maria Matejka [Tue, 27 Sep 2022 10:17:05 +0000 (12:17 +0200)]
KRT: Fix route learning
This is a reimplementation of commit 0f2be469f897b6d9f925563bbf522438c83522ea
by Alexander Zubkov. In the master branch, changes in commit eb937358
broke setting of channel preference for alien routes learned during
scan. The preference was set only for async routes.
The original solution is extended here to accomodate for v3 specifics.
Alexander Zubkov [Wed, 21 Sep 2022 15:07:11 +0000 (17:07 +0200)]
KRT: Fix setting default preference
Changes in commit eb937358 broke setting of channel preference for alien
routes learned during scan. The preference was set only for async routes.
Move common attribute processing part of functions krt_learn_async() and
krt_learn_async() to a separate function to have only one place for such
changes.
Maria Matejka [Wed, 21 Sep 2022 14:53:17 +0000 (16:53 +0200)]
Caching eattrs in filters is not needed anymore.
After flattening the route attribute structure, the ea_list ** is derivable
from rte * by arithmetics. Caching the derived value doesn't help performance
and therefore is removed as unnecessary.