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bridge: mrp: Add br_mrp_unique_ifindex function

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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: 9a9f26e8f7 ("bridge: mrp: Connect MRP API with the switchdev API")
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Horatiu Vultur 2020-05-21 23:19:05 +00:00 committed by David S. Miller
parent a74707396c
commit 7aa38018be
1 changed files with 25 additions and 0 deletions
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25
net/bridge/br_mrp.c
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@ -37,6 +37,26 @@ 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;
list_for_each_entry_rcu(mrp, &br->mrp_list, list,
lockdep_rtnl_is_held()) {
struct net_bridge_port *p;
p = rtnl_dereference(mrp->p_port);
if (p && p->dev->ifindex == ifindex)
return false;
p = rtnl_dereference(mrp->s_port);
if (p && p->dev->ifindex == ifindex)
return false;
}
return true;
}
static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
struct net_bridge_port *p)
{
@ -255,6 +275,11 @@ 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;