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Documentation: networking: Add a caveat to nexthop_compat_mode sysctl

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[ Upstream commit bbe4b41259a3e255a16d795486d331c1670b4e75 ]

net.ipv4.nexthop_compat_mode was added when nexthop objects were added to
provide the view of nexthop objects through the usual lens of the route
UAPI. As nexthop objects evolved, the information provided through this
lens became incomplete. For example, details of resilient nexthop groups
are obviously omitted.

Now that 16-bit nexthop group weights are a thing, the 8-bit UAPI cannot
convey the >8-bit weight accurately. Instead of inventing workarounds for
an obsolete interface, just document the expectations of inaccuracy.

Fixes: b72a6a7ab957 ("net: nexthop: Increase weight to u16")
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/b575e32399ccacd09079b2a218255164535123bd.1733740749.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Petr Machata 2024-12-09 12:05:31 +01:00 committed by Greg Kroah-Hartman
parent fe92740276
commit 3f5bf3dc6f
1 changed files with 6 additions and 0 deletions
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6
Documentation/networking/ip-sysctl.rst
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@ -2170,6 +2170,12 @@ nexthop_compat_mode - BOOLEAN
understands the new API, this sysctl can be disabled to achieve full
performance benefits of the new API by disabling the nexthop expansion
and extraneous notifications.
Note that as a backward-compatible mode, dumping of modern features
might be incomplete or wrong. For example, resilient groups will not be
shown as such, but rather as just a list of next hops. Also weights that
do not fit into 8 bits will show incorrectly.
Default: true (backward compat mode)
fib_notify_on_flag_change - INTEGER