cxgb3 - Safeguard TCAM size usage

Ensure that the TCAM active region size is at least 16.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index d55383610559..b82544e08689 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -485,12 +485,14 @@ static ssize_t show_##name(struct device *d, struct device_attribute *attr, \
 static ssize_t set_nfilters(struct net_device *dev, unsigned int val)
 {
         struct adapter *adap = dev->priv;
+        int min_tids = is_offload(adap) ? MC5_MIN_TIDS : 0;
 
         if (adap->flags & FULL_INIT_DONE)
                 return -EBUSY;
         if (val && adap->params.rev == 0)
                 return -EINVAL;
-        if (val > t3_mc5_size(&adap->mc5) - adap->params.mc5.nservers)
+        if (val > t3_mc5_size(&adap->mc5) - adap->params.mc5.nservers -
+            min_tids)
                 return -EINVAL;
         adap->params.mc5.nfilters = val;
         return 0;
@@ -508,7 +510,8 @@ static ssize_t set_nservers(struct net_device *dev, unsigned int val)
 
         if (adap->flags & FULL_INIT_DONE)
                 return -EBUSY;
-        if (val > t3_mc5_size(&adap->mc5) - adap->params.mc5.nfilters)
+        if (val > t3_mc5_size(&adap->mc5) - adap->params.mc5.nfilters -
+            MC5_MIN_TIDS)
                 return -EINVAL;
         adap->params.mc5.nservers = val;
         return 0;