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

[ Upstream commit 08193d1a893c802c4b807e4d522865061f4e9f4f ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index bae7d78aa06895dd9237abc6f1bc2ae3db23f38b..fbeacbc2be5dafd49963d518985be84839606a00 100644 (file)
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1765,7 +1765,7 @@ 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;
        }
 
@@ -1800,7 +1800,8 @@ 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);
 
@@ -1828,7 +1829,8 @@ 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 {
@@ -1861,7 +1863,8 @@ 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);