[PATCH net-next 08/14] nexthop: Allow setting "offload" and "trap" indication of nexthop buckets
From: Petr Machata <petrm@nvidia.com>
Date: 2021-03-10 15:05:07
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
From: Ido Schimmel <idosch@nvidia.com>
Add a function that can be called by device drivers to set "offload" or
"trap" indication on nexthop buckets following nexthop notifications and
other changes such as a neighbour becoming invalid.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
---
Notes:
v1 (changes since RFC):
- u32 -> u16 for bucket counts / indices
include/net/nexthop.h | 2 ++
net/ipv4/nexthop.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index fd3c0debe8bf..685f208d26b5 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h@@ -220,6 +220,8 @@ int register_nexthop_notifier(struct net *net, struct notifier_block *nb, struct netlink_ext_ack *extack); int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb); void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap); +void nexthop_bucket_set_hw_flags(struct net *net, u32 id, u16 bucket_index, + bool offload, bool trap); /* caller is holding rcu or rtnl; no reference taken to nexthop */ struct nexthop *nexthop_find_by_id(struct net *net, u32 id);
diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 8b06aafc2e9e..1fce4ff39390 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c@@ -3072,6 +3072,40 @@ void nexthop_set_hw_flags(struct net *net, u32 id, bool offload, bool trap) } EXPORT_SYMBOL(nexthop_set_hw_flags); +void nexthop_bucket_set_hw_flags(struct net *net, u32 id, u16 bucket_index, + bool offload, bool trap) +{ + struct nh_res_table *res_table; + struct nh_res_bucket *bucket; + struct nexthop *nexthop; + struct nh_group *nhg; + + rcu_read_lock(); + + nexthop = nexthop_find_by_id(net, id); + if (!nexthop || !nexthop->is_group) + goto out; + + nhg = rcu_dereference(nexthop->nh_grp); + if (!nhg->resilient) + goto out; + + if (bucket_index >= nhg->res_table->num_nh_buckets) + goto out; + + res_table = rcu_dereference(nhg->res_table); + bucket = &res_table->nh_buckets[bucket_index]; + bucket->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP); + if (offload) + bucket->nh_flags |= RTNH_F_OFFLOAD; + if (trap) + bucket->nh_flags |= RTNH_F_TRAP; + +out: + rcu_read_unlock(); +} +EXPORT_SYMBOL(nexthop_bucket_set_hw_flags); + static void __net_exit nexthop_net_exit(struct net *net) { rtnl_lock();
--
2.26.2