From: Horatiu Vultur <horatiu.vultur@microchip.com>
To: <jiri@resnulli.us>, <ivecera@redhat.com>, <davem@davemloft.net>,
<kuba@kernel.org>, <roopa@cumulusnetworks.com>,
<nikolay@cumulusnetworks.com>, <andrew@lunn.ch>,
<UNGLinuxDriver@microchip.com>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<bridge@lists.linux-foundation.org>
Cc: Horatiu Vultur <horatiu.vultur@microchip.com>
Subject: [PATCH 1/3] bridge: mrp: Add br_mrp_unique_ifindex function
Date: Wed, 20 May 2020 13:09:21 +0000 [thread overview]
Message-ID: <20200520130923.3196432-2-horatiu.vultur@microchip.com> (raw)
In-Reply-To: <20200520130923.3196432-1-horatiu.vultur@microchip.com>
It is not allow to have the same net bridge port part of multiple MRP
rings. Therefore add a check if the port is used already in a different
MRP. In that case return failure.
Fixes: 9a9f26e8f7ea ("bridge: mrp: Connect MRP API with the switchdev API")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
net/bridge/br_mrp.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
index d7bc09de4c139..a5a3fa59c078a 100644
--- a/net/bridge/br_mrp.c
+++ b/net/bridge/br_mrp.c
@@ -37,6 +37,32 @@ static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
return res;
}
+static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
+{
+ struct br_mrp *mrp;
+ bool res = true;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(mrp, &br->mrp_list, list,
+ lockdep_rtnl_is_held()) {
+ struct net_bridge_port *p;
+
+ p = rcu_dereference(mrp->p_port);
+ if (p && p->dev->ifindex == ifindex) {
+ res = false;
+ break;
+ }
+
+ p = rcu_dereference(mrp->s_port);
+ if (p && p->dev->ifindex == ifindex) {
+ res = false;
+ break;
+ }
+ }
+ rcu_read_unlock();
+ return res;
+}
+
static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
struct net_bridge_port *p)
{
@@ -255,6 +281,11 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
!br_mrp_get_port(br, instance->s_ifindex))
return -EINVAL;
+ /* It is not possible to have the same port part of multiple rings */
+ if (!br_mrp_unique_ifindex(br, instance->p_ifindex) ||
+ !br_mrp_unique_ifindex(br, instance->s_ifindex))
+ return -EINVAL;
+
mrp = kzalloc(sizeof(*mrp), GFP_KERNEL);
if (!mrp)
return -ENOMEM;
--
2.26.2
next prev parent reply other threads:[~2020-05-20 11:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 13:09 [PATCH 0/3] net: bridge: mrp: Add small fixes to MRP Horatiu Vultur
2020-05-20 13:09 ` Horatiu Vultur [this message]
2020-05-21 8:16 ` [PATCH 1/3] bridge: mrp: Add br_mrp_unique_ifindex function Nikolay Aleksandrov
2020-05-21 18:49 ` Horatiu Vultur
2020-05-21 16:58 ` Nikolay Aleksandrov
2020-05-21 19:30 ` Horatiu Vultur
2020-05-20 13:09 ` [PATCH 2/3] switchdev: mrp: Remove the variable mrp_ring_state Horatiu Vultur
2020-05-20 15:56 ` Ivan Vecera
2020-05-20 13:09 ` [PATCH 3/3] bridge: mrp: Restore port state when deleting MRP instance Horatiu Vultur
2020-05-21 8:18 ` Nikolay Aleksandrov
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