net: dcb: For wild-card lookups, use priority -1, not 0

The function dcb_app_lookup walks the list of specified DCB APP entries,
looking for one that matches a given criteria: ifindex, selector,
protocol ID and optionally also priority. The "don't care" value for
priority is set to 0, because that priority has not been allowed under
CEE regime, which predates the IEEE standardization.

Under IEEE, 0 is a valid priority number. But because dcb_app_lookup
considers zero a wild card, attempts to add an APP entry with priority 0
fail when other entries exist for a given ifindex / selector / PID
triplet.

Fix by changing the wild-card value to -1.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 2589a6b78aa175a207cf592e5c8b611ca95f232e..013fdb6fa07abbd73bbcf303550ed0693a27a86e 100644 (file)
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1786,7 +1786,7 @@ static struct dcb_app_type *dcb_app_lookup(const struct dcb_app *app,
                if (itr->app.selector == app->selector &&
                    itr->app.protocol == app->protocol &&
                    itr->ifindex == ifindex &&
-                   (!prio || itr->app.priority == prio))
+                   ((prio == -1) || itr->app.priority == prio))
                        return itr;
        }
 
@@ -1821,7 +1821,8 @@ u8 dcb_getapp(struct net_device *dev, struct dcb_app *app)
        u8 prio = 0;
 
        spin_lock_bh(&dcb_lock);
-       if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
+       itr = dcb_app_lookup(app, dev->ifindex, -1);
+       if (itr)
                prio = itr->app.priority;
        spin_unlock_bh(&dcb_lock);
 
@@ -1849,7 +1850,8 @@ int dcb_setapp(struct net_device *dev, struct dcb_app *new)
 
        spin_lock_bh(&dcb_lock);
        /* Search for existing match and replace */
-       if ((itr = dcb_app_lookup(new, dev->ifindex, 0))) {
+       itr = dcb_app_lookup(new, dev->ifindex, -1);
+       if (itr) {
                if (new->priority)
                        itr->app.priority = new->priority;
                else {
@@ -1882,7 +1884,8 @@ u8 dcb_ieee_getapp_mask(struct net_device *dev, struct dcb_app *app)
        u8 prio = 0;
 
        spin_lock_bh(&dcb_lock);
-       if ((itr = dcb_app_lookup(app, dev->ifindex, 0)))
+       itr = dcb_app_lookup(app, dev->ifindex, -1);
+       if (itr)
                prio |= 1 << itr->app.priority;
        spin_unlock_bh(&dcb_lock);