netdev - [RFC PATCH net-next 10/22] nexthop: Allow setting "offload" and "trap" indications on nexthops

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Message-Id: <20200908091037.2709823-11-idosch@idosch.org>
Date:   Tue,  8 Sep 2020 12:10:25 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, dsahern@...il.com,
        roopa@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [RFC PATCH net-next 10/22] nexthop: Allow setting "offload" and "trap" indications on nexthops

From: Ido Schimmel <idosch@...dia.com>

Add a function that can be called by device drivers to set "offload" or
"trap" indication on nexthops following nexthop notifications.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 include/net/nexthop.h |  1 +
 net/ipv4/nexthop.c    | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/net/nexthop.h b/include/net/nexthop.h
index 0bde1aa867c0..4147681e86d2 100644
--- a/include/net/nexthop.h
+++ b/include/net/nexthop.h
@@ -146,6 +146,7 @@ struct nh_notifier_info {
 
 int register_nexthop_notifier(struct net *net, struct notifier_block *nb);
 int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb);
+void nexthop_hw_flags_set(struct net *net, u32 id, 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 70c8ab6906ec..71605c612458 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -2080,6 +2080,27 @@ int unregister_nexthop_notifier(struct net *net, struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_nexthop_notifier);
 
+void nexthop_hw_flags_set(struct net *net, u32 id, bool offload, bool trap)
+{
+	struct nexthop *nexthop;
+
+	rcu_read_lock();
+
+	nexthop = nexthop_find_by_id(net, id);
+	if (!nexthop)
+		goto out;
+
+	nexthop->nh_flags &= ~(RTNH_F_OFFLOAD | RTNH_F_TRAP);
+	if (offload)
+		nexthop->nh_flags |= RTNH_F_OFFLOAD;
+	if (trap)
+		nexthop->nh_flags |= RTNH_F_TRAP;
+
+out:
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL(nexthop_hw_flags_set);
+
 static void __net_exit nexthop_net_exit(struct net *net)
 {
 	rtnl_lock();
-- 
2.26.2