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Date: Sun, 28 Jun 2009 23:36:02 +0200
From: Jarek Poplawski <jarkao2@...il.com>
To: Paweł Staszewski <pstaszewski@...are.pl>,
David Miller <davem@...emloft.net>
Cc: Robert Olsson <robert@...ur.slu.se>,
Robert Olsson <Robert.Olsson@...a.slu.se>,
"Jorge Boncompte [DTI2]" <jorge@...2.net>,
Eric Dumazet <dada1@...mosbay.com>,
Robert Olsson <robert.olsson@....uu.se>,
Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: rib_trie / Fix inflate_threshold_root. Now=15 size=11 bits
To David Miller:
since among patches tested negatively by Pawel are current 2 fixes
from 2.6.31-rc, I hope they weren't sent to -stable yet. Otherwise,
please withdraw them until they are tested alone. Thanks.
To Pawel:
On Sun, Jun 28, 2009 at 05:48:19PM +0200, Paweł Staszewski wrote:
>
> After apply this patch something is wrong
>
> Traffic is not forwarded
> no info in dmesg / no info from bgp
> and also i can't connect to bgpd process
>
> I revert kernel to past version with first Jarek patch
>
Since checking this can take time I attach here a patch with only
changes which are currently in 2.6.31-rc. Of course, this part can be
broken as well, so it's up to you: if you could try it with caution
somewhere it would be very helpful; otherwise don't bother.
It could be applied to 2.6.29 with or without this currently working
patch.
Thanks,
Jarek P.
--- (for 2.6.29.x, .28 or .27)
diff -Nurp a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
--- a/net/ipv4/fib_trie.c 2009-06-27 20:25:06.000000000 +0200
+++ b/net/ipv4/fib_trie.c 2009-06-28 23:06:02.000000000 +0200
@@ -123,6 +123,7 @@ struct tnode {
union {
struct rcu_head rcu;
struct work_struct work;
+ struct tnode *tnode_free;
};
struct node *child[0];
};
@@ -161,6 +162,8 @@ static void tnode_put_child_reorg(struct
static struct node *resize(struct trie *t, struct tnode *tn);
static struct tnode *inflate(struct trie *t, struct tnode *tn);
static struct tnode *halve(struct trie *t, struct tnode *tn);
+/* tnodes to free after resize(); protected by RTNL */
+static struct tnode *tnode_free_head;
static struct kmem_cache *fn_alias_kmem __read_mostly;
static struct kmem_cache *trie_leaf_kmem __read_mostly;
@@ -385,6 +388,24 @@ static inline void tnode_free(struct tno
call_rcu(&tn->rcu, __tnode_free_rcu);
}
+static void tnode_free_safe(struct tnode *tn)
+{
+ BUG_ON(IS_LEAF(tn));
+ tn->tnode_free = tnode_free_head;
+ tnode_free_head = tn;
+}
+
+static void tnode_free_flush(void)
+{
+ struct tnode *tn;
+
+ while ((tn = tnode_free_head)) {
+ tnode_free_head = tn->tnode_free;
+ tn->tnode_free = NULL;
+ tnode_free(tn);
+ }
+}
+
static struct leaf *leaf_new(void)
{
struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
@@ -495,7 +516,7 @@ static struct node *resize(struct trie *
/* No children */
if (tn->empty_children == tnode_child_length(tn)) {
- tnode_free(tn);
+ tnode_free_safe(tn);
return NULL;
}
/* One child */
@@ -509,7 +530,7 @@ static struct node *resize(struct trie *
/* compress one level */
node_set_parent(n, NULL);
- tnode_free(tn);
+ tnode_free_safe(tn);
return n;
}
/*
@@ -670,7 +691,7 @@ static struct node *resize(struct trie *
/* compress one level */
node_set_parent(n, NULL);
- tnode_free(tn);
+ tnode_free_safe(tn);
return n;
}
@@ -756,7 +777,7 @@ static struct tnode *inflate(struct trie
put_child(t, tn, 2*i, inode->child[0]);
put_child(t, tn, 2*i+1, inode->child[1]);
- tnode_free(inode);
+ tnode_free_safe(inode);
continue;
}
@@ -801,9 +822,9 @@ static struct tnode *inflate(struct trie
put_child(t, tn, 2*i, resize(t, left));
put_child(t, tn, 2*i+1, resize(t, right));
- tnode_free(inode);
+ tnode_free_safe(inode);
}
- tnode_free(oldtnode);
+ tnode_free_safe(oldtnode);
return tn;
nomem:
{
@@ -885,7 +906,7 @@ static struct tnode *halve(struct trie *
put_child(t, newBinNode, 1, right);
put_child(t, tn, i/2, resize(t, newBinNode));
}
- tnode_free(oldtnode);
+ tnode_free_safe(oldtnode);
return tn;
nomem:
{
@@ -983,12 +1004,14 @@ fib_find_node(struct trie *t, u32 key)
return NULL;
}
-static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
+static void trie_rebalance(struct trie *t, struct tnode *tn)
{
int wasfull;
- t_key cindex, key = tn->key;
+ t_key cindex, key;
struct tnode *tp;
+ key = tn->key;
+
while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) {
cindex = tkey_extract_bits(key, tp->pos, tp->bits);
wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
@@ -998,6 +1021,7 @@ static struct node *trie_rebalance(struc
(struct node *)tn, wasfull);
tp = node_parent((struct node *) tn);
+ tnode_free_flush();
if (!tp)
break;
tn = tp;
@@ -1007,7 +1031,10 @@ static struct node *trie_rebalance(struc
if (IS_TNODE(tn))
tn = (struct tnode *)resize(t, (struct tnode *)tn);
- return (struct node *)tn;
+ rcu_assign_pointer(t->trie, (struct node *)tn);
+ tnode_free_flush();
+
+ return;
}
/* only used from updater-side */
@@ -1155,7 +1182,7 @@ static struct list_head *fib_insert_node
/* Rebalance the trie */
- rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
+ trie_rebalance(t, tp);
done:
return fa_head;
}
@@ -1575,7 +1602,7 @@ static void trie_leaf_remove(struct trie
if (tp) {
t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits);
put_child(t, (struct tnode *)tp, cindex, NULL);
- rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
+ trie_rebalance(t, tp);
} else
rcu_assign_pointer(t->trie, NULL);
--
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