| Message ID | 20210201194757.3463461-1-idosch@idosch.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | Add notifications when route hardware flags change | expand |
Hello: This series was applied to netdev/net-next.git (refs/heads/master): On Mon, 1 Feb 2021 21:47:47 +0200 you wrote: > From: Ido Schimmel <idosch@nvidia.com> > > Routes installed to the kernel can be programmed to capable devices, in > which case they are marked with one of two flags. RTM_F_OFFLOAD for > routes that offload traffic from the kernel and RTM_F_TRAP for routes > that trap packets to the kernel for processing (e.g., host routes). > > [...] Here is the summary with links: - [net-next,v2,01/10] netdevsim: fib: Convert the current occupancy to an atomic variable https://git.kernel.org/netdev/net-next/c/9e635a21cae0 - [net-next,v2,02/10] netdevsim: fib: Perform the route programming in a non-atomic context https://git.kernel.org/netdev/net-next/c/0ae3eb7b4611 - [net-next,v2,03/10] net: ipv4: Pass fib_rt_info as const to fib_dump_info() https://git.kernel.org/netdev/net-next/c/085547891de5 - [net-next,v2,04/10] net: ipv4: Publish fib_nlmsg_size() https://git.kernel.org/netdev/net-next/c/1e7bdec6bbc7 - [net-next,v2,05/10] net: ipv4: Emit notification when fib hardware flags are changed https://git.kernel.org/netdev/net-next/c/680aea08e78c - [net-next,v2,06/10] net: Pass 'net' struct as first argument to fib6_info_hw_flags_set() https://git.kernel.org/netdev/net-next/c/fbaca8f895a6 - [net-next,v2,07/10] net: Do not call fib6_info_hw_flags_set() when IPv6 is disabled https://git.kernel.org/netdev/net-next/c/efc42879ec9e - [net-next,v2,08/10] net: ipv6: Emit notification when fib hardware flags are changed https://git.kernel.org/netdev/net-next/c/907eea486888 - [net-next,v2,09/10] selftests: Extend fib tests to run with and without flags notifications https://git.kernel.org/netdev/net-next/c/d1a7a489287c - [net-next,v2,10/10] selftests: netdevsim: Add fib_notifications test https://git.kernel.org/netdev/net-next/c/19d36d2971e6 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
From: Ido Schimmel <idosch@nvidia.com> Routes installed to the kernel can be programmed to capable devices, in which case they are marked with one of two flags. RTM_F_OFFLOAD for routes that offload traffic from the kernel and RTM_F_TRAP for routes that trap packets to the kernel for processing (e.g., host routes). These flags are of interest to routing daemons since they would like to delay advertisement of routes until they are installed in hardware. This allows them to avoid packet loss or misrouted packets. Currently, routing daemons do not receive any notifications when these flags are changed, requiring them to poll the kernel tables for changes which is inefficient. This series addresses the issue by having the kernel emit RTM_NEWROUTE notifications whenever these flags change. The behavior is controlled by two sysctls (net.ipv4.fib_notify_on_flag_change and net.ipv6.fib_notify_on_flag_change) that default to 0 (no notifications). Note that even if route installation in hardware is improved to be more synchronous, these notifications are still of interest. For example, a multipath route can change from RTM_F_OFFLOAD to RTM_F_TRAP if its neighbours become invalid. A routing daemon can choose to withdraw / replace the route in that case. In addition, the deletion of a route from the kernel can prompt the installation of an identical route (already in kernel, with an higher metric) to hardware. For testing purposes, netdevsim is aligned to simulate a "real" driver that programs routes to hardware. Series overview: Patches #1-#2 align netdevsim to perform route programming in a non-atomic context Patches #3-#5 add sysctl to control IPv4 notifications Patches #6-#8 add sysctl to control IPv6 notifications Patch #9 extends existing fib tests to set sysctls before running tests Patch #10 adds test for fib notifications over netdevsim v2: * Patch #1: Use atomic64_sub() in nsim_nexthop_account()'s error path Amit Cohen (10): netdevsim: fib: Convert the current occupancy to an atomic variable netdevsim: fib: Perform the route programming in a non-atomic context net: ipv4: Pass fib_rt_info as const to fib_dump_info() net: ipv4: Publish fib_nlmsg_size() net: ipv4: Emit notification when fib hardware flags are changed net: Pass 'net' struct as first argument to fib6_info_hw_flags_set() net: Do not call fib6_info_hw_flags_set() when IPv6 is disabled net: ipv6: Emit notification when fib hardware flags are changed selftests: Extend fib tests to run with and without flags notifications selftests: netdevsim: Add fib_notifications test Documentation/networking/ip-sysctl.rst | 40 ++ .../ethernet/mellanox/mlxsw/spectrum_router.c | 23 +- drivers/net/netdevsim/fib.c | 534 ++++++++++++------ include/net/ip6_fib.h | 9 +- include/net/netns/ipv4.h | 2 + include/net/netns/ipv6.h | 1 + net/ipv4/af_inet.c | 2 + net/ipv4/fib_lookup.h | 3 +- net/ipv4/fib_semantics.c | 4 +- net/ipv4/fib_trie.c | 27 + net/ipv4/sysctl_net_ipv4.c | 9 + net/ipv6/af_inet6.c | 1 + net/ipv6/route.c | 44 ++ net/ipv6/sysctl_net_ipv6.c | 9 + .../selftests/drivers/net/mlxsw/fib.sh | 14 + .../selftests/drivers/net/netdevsim/fib.sh | 14 + .../net/netdevsim/fib_notifications.sh | 300 ++++++++++ 17 files changed, 854 insertions(+), 182 deletions(-) create mode 100755 tools/testing/selftests/drivers/net/netdevsim/fib_notifications.sh