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fib_trie: Pull empty_children and full_children into tnode 

This pulls the information about the child array out of the key_vector and
places it in the tnode since that is where it is needed.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2015-03-06 09:54:39 -08:00 committed by David S. Miller
parent 56ca2adf6a
commit 6e22d174ba
1 changed files with 16 additions and 15 deletions
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31
net/ipv4/fib_trie.c
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@ -93,8 +93,6 @@ typedef unsigned int t_key;
#define IS_LEAF(n) (!(n)->bits)
struct key_vector {
t_key empty_children; /* KEYLENGTH bits needed */
t_key full_children; /* KEYLENGTH bits needed */
struct key_vector __rcu *parent;
t_key key;
@ -111,6 +109,8 @@ struct key_vector {
struct tnode {
struct rcu_head rcu;
t_key empty_children; /* KEYLENGTH bits needed */
t_key full_children; /* KEYLENGTH bits needed */
struct key_vector kv[1];
#define tn_bits kv[0].bits
};
@ -309,12 +309,12 @@ static struct tnode *tnode_alloc(int bits)
static inline void empty_child_inc(struct key_vector *n)
{
++n->empty_children ? : ++n->full_children;
++tn_info(n)->empty_children ? : ++tn_info(n)->full_children;
}
static inline void empty_child_dec(struct key_vector *n)
{
n->empty_children-- ? : n->full_children--;
tn_info(n)->empty_children-- ? : tn_info(n)->full_children--;
}
static struct key_vector *leaf_new(t_key key, struct fib_alias *fa)
@ -354,9 +354,9 @@ static struct key_vector *tnode_new(t_key key, int pos, int bits)
return NULL;
if (bits == KEYLENGTH)
tn->full_children = 1;
tnode->full_children = 1;
else
tn->empty_children = 1ul << bits;
tnode->empty_children = 1ul << bits;
tn->key = (shift < KEYLENGTH) ? (key >> shift) << shift : 0;
tn->pos = pos;
@ -396,9 +396,9 @@ static void put_child(struct key_vector *tn, unsigned long i,
isfull = tnode_full(tn, n);
if (wasfull && !isfull)
tn->full_children--;
tn_info(tn)->full_children--;
else if (!wasfull && isfull)
tn->full_children++;
tn_info(tn)->full_children++;
if (n && (tn->slen < n->slen))
tn->slen = n->slen;
@ -768,8 +768,8 @@ static inline bool should_inflate(struct key_vector *tp, struct key_vector *tn)
/* Keep root node larger */
threshold *= tp ? inflate_threshold : inflate_threshold_root;
used -= tn->empty_children;
used += tn->full_children;
used -= tn_info(tn)->empty_children;
used += tn_info(tn)->full_children;
/* if bits == KEYLENGTH then pos = 0, and will fail below */
@ -783,7 +783,7 @@ static inline bool should_halve(struct key_vector *tp, struct key_vector *tn)
/* Keep root node larger */
threshold *= tp ? halve_threshold : halve_threshold_root;
used -= tn->empty_children;
used -= tn_info(tn)->empty_children;
/* if bits == KEYLENGTH then used = 100% on wrap, and will fail below */
@ -794,10 +794,10 @@ static inline bool should_collapse(struct key_vector *tn)
{
unsigned long used = child_length(tn);
used -= tn->empty_children;
used -= tn_info(tn)->empty_children;
/* account for bits == KEYLENGTH case */
if ((tn->bits == KEYLENGTH) && tn->full_children)
if ((tn->bits == KEYLENGTH) && tn_info(tn)->full_children)
used -= KEY_MAX;
/* One child or none, time to drop us from the trie */
@ -1963,7 +1963,7 @@ static void trie_collect_stats(struct trie *t, struct trie_stat *s)
s->tnodes++;
if (n->bits < MAX_STAT_DEPTH)
s->nodesizes[n->bits]++;
s->nullpointers += n->empty_children;
s->nullpointers += tn_info(n)->empty_children;
}
}
rcu_read_unlock();
@ -2238,7 +2238,8 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
seq_indent(seq, iter->depth-1);
seq_printf(seq, " +-- %pI4/%zu %u %u %u\n",
&prf, KEYLENGTH - n->pos - n->bits, n->bits,
n->full_children, n->empty_children);
tn_info(n)->full_children,
tn_info(n)->empty_children);
} else {
__be32 val = htonl(n->key);
struct fib_alias *fa;