lkml.org 
[lkml]   [2018]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 4.9 39/62] net: dcb: For wild-card lookups, use priority -1, not 0
Date
From: Petr Machata <petrm@mellanox.com>

[ 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>
---
net/dcb/dcbnl.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 3202d75329b5..a1116701287f 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -1764,7 +1764,7 @@ 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;
}

@@ -1799,7 +1799,8 @@ 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);

@@ -1827,7 +1828,8 @@ 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 {
@@ -1860,7 +1862,8 @@ 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);

--
2.17.1
\
 
 \ /
  Last update: 2018-09-02 15:15    [W:0.208 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site