[PATCH net-next v2 02/10] netdevsim: add warnings on unexpected UDP tunnel port errors

[Jakub Kicinski]

We should never see a removal of a port which is not in the table
or adding a port to an occupied entry in the table. To make sure
such errors don't escape the checks in the test script add a
warning/kernel spat.

Error injection will not trigger those, nor should it ever put
us in a bad state.

Signed-off-by: Jakub Kicinski <k...@kernel.org>
---
 drivers/net/netdevsim/udp_tunnels.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/netdevsim/udp_tunnels.c 
b/drivers/net/netdevsim/udp_tunnels.c
index 22c06a76033c..ad65b860bd7b 100644
--- a/drivers/net/netdevsim/udp_tunnels.c
+++ b/drivers/net/netdevsim/udp_tunnels.c
@@ -22,11 +22,13 @@ nsim_udp_tunnel_set_port(struct net_device *dev, unsigned 
int table,
                msleep(ns->udp_ports.sleep);
 
        if (!ret) {
-               if (ns->udp_ports.ports[table][entry])
+               if (ns->udp_ports.ports[table][entry]) {
+                       WARN(1, "entry already in use\n");
                        ret = -EBUSY;
-               else
+               } else {
                        ns->udp_ports.ports[table][entry] =
                                be16_to_cpu(ti->port) << 16 | ti->type;
+               }
        }
 
        netdev_info(dev, "set [%d, %d] type %d family %d port %d - %d\n",
@@ -50,10 +52,13 @@ nsim_udp_tunnel_unset_port(struct net_device *dev, unsigned 
int table,
        if (!ret) {
                u32 val = be16_to_cpu(ti->port) << 16 | ti->type;
 
-               if (val == ns->udp_ports.ports[table][entry])
+               if (val == ns->udp_ports.ports[table][entry]) {
                        ns->udp_ports.ports[table][entry] = 0;
-               else
+               } else {
+                       WARN(1, "entry not installed %x vs %x\n",
+                            val, ns->udp_ports.ports[table][entry]);
                        ret = -ENOENT;
+               }
        }
 
        netdev_info(dev, "unset [%d, %d] type %d family %d port %d - %d\n",
-- 
2.26.2