[v3 PATCH 1/2] netprio_cgroup: Remove update_netdev_tables() since it is unnecessary

[v3 PATCH 1/2] netprio_cgroup: Remove update_netdev_tables() since it is unnecessary

[Srivatsa S. Bhat]

The update_netdev_tables() function appears to be unnecessary, since the
write_update_netdev_table() function will adjust the priomaps as and when
required anyway. So drop the usage of update_netdev_tables() entirely.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---

 net/core/netprio_cgroup.c |   32 --------------------------------
 1 files changed, 0 insertions(+), 32 deletions(-)

diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index c75e3f9..fd339bb0 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -109,32 +109,6 @@ static int write_update_netdev_table(struct net_device *dev)
 	return ret;
 }
 
-static int update_netdev_tables(void)
-{
-	int ret = 0;
-	struct net_device *dev;
-	u32 max_len;
-	struct netprio_map *map;
-
-	rtnl_lock();
-	max_len = atomic_read(&max_prioidx) + 1;
-	for_each_netdev(&init_net, dev) {
-		map = rtnl_dereference(dev->priomap);
-		/*
-		 * don't allocate priomap if we didn't
-		 * change net_prio.ifpriomap (map == NULL),
-		 * this will speed up skb_update_prio.
-		 */
-		if (map && map->priomap_len < max_len) {
-			ret = extend_netdev_table(dev, max_len);
-			if (ret < 0)
-				break;
-		}
-	}
-	rtnl_unlock();
-	return ret;
-}
-
 static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp)
 {
 	struct cgroup_netprio_state *cs;
@@ -153,12 +127,6 @@ static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp)
 		goto out;
 	}
 
-	ret = update_netdev_tables();
-	if (ret < 0) {
-		put_prioidx(cs->prioidx);
-		goto out;
-	}
-
 	return &cs->css;
 out:
 	kfree(cs);

[v3 PATCH 2/2] netprio_cgroup: Use memcpy instead of the for-loop to copy priomap

[Srivatsa S. Bhat]

Replace the current (inefficient) for-loop with memcpy, to copy priomap.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---

 net/core/netprio_cgroup.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index fd339bb0..45c503e 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -73,7 +73,6 @@ static int extend_netdev_table(struct net_device *dev, u32 new_len)
 			   ((sizeof(u32) * new_len));
 	struct netprio_map *new_priomap = kzalloc(new_size, GFP_KERNEL);
 	struct netprio_map *old_priomap;
-	int i;
 
 	old_priomap  = rtnl_dereference(dev->priomap);
 
@@ -82,10 +81,10 @@ static int extend_netdev_table(struct net_device *dev, u32 new_len)
 		return -ENOMEM;
 	}
 
-	for (i = 0;
-	     old_priomap && (i < old_priomap->priomap_len);
-	     i++)
-		new_priomap->priomap[i] = old_priomap->priomap[i];
+	if (old_priomap)
+		memcpy(new_priomap->priomap, old_priomap->priomap,
+		       old_priomap->priomap_len *
+		       sizeof(old_priomap->priomap[0]));
 
 	new_priomap->priomap_len = new_len;
 

Re: [v3 PATCH 1/2] netprio_cgroup: Remove update_netdev_tables() since it is unnecessary

[David Miller]

From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Thu, 13 Sep 2012 12:02:25 +0530

> The update_netdev_tables() function appears to be unnecessary, since the
> write_update_netdev_table() function will adjust the priomaps as and when
> required anyway. So drop the usage of update_netdev_tables() entirely.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>

Applied to net-next

Re: [v3 PATCH 2/2] netprio_cgroup: Use memcpy instead of the for-loop to copy priomap

[David Miller]

From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Date: Thu, 13 Sep 2012 12:02:34 +0530

> Replace the current (inefficient) for-loop with memcpy, to copy priomap.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>

Applied to net-next