Commit 56ad5ba3 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

nexthop: Allow setting "offload" and "trap" indication of nexthop buckets 



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: default avatarIdo Schimmel <idosch@nvidia.com>
Reviewed-by: default avatarPetr Machata <petrm@nvidia.com>
Reviewed-by: default avatarDavid Ahern <dsahern@kernel.org>
Signed-off-by: default avatarPetr Machata <petrm@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c37c7e0

include/net/nexthop.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv4/nexthop.c

+34 −0
Original line number Diff line number Diff line
@@ -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();