From: Stephen Hemminger Date: Fri, 10 Aug 2007 22:22:13 +0000 (-0700) Subject: [IPV4] fib_trie: cleanup X-Git-Tag: v2.6.24-rc1~1454^2~814 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0680191642c27c81c9be4557d9c6aa3487c15f69;p=linux-2.6 [IPV4] fib_trie: cleanup Try this out: * replace macro's with inlines * get rid of places doing multiple evaluations of NODE_PARENT [akpm@linux-foundation.org: rcu_dereference wants an lval] Signed-off-by: Andrew Morton Signed-off-by: David S. Miller --- diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 9ca786a6fd..f28f9f5f24 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -93,15 +93,8 @@ typedef unsigned int t_key; #define T_TNODE 0 #define T_LEAF 1 #define NODE_TYPE_MASK 0x1UL -#define NODE_PARENT(node) \ - ((struct tnode *)rcu_dereference(((node)->parent & ~NODE_TYPE_MASK))) - #define NODE_TYPE(node) ((node)->parent & NODE_TYPE_MASK) -#define NODE_SET_PARENT(node, ptr) \ - rcu_assign_pointer((node)->parent, \ - ((unsigned long)(ptr)) | NODE_TYPE(node)) - #define IS_TNODE(n) (!(n->parent & T_LEAF)) #define IS_LEAF(n) (n->parent & T_LEAF) @@ -174,6 +167,19 @@ static void tnode_free(struct tnode *tn); static struct kmem_cache *fn_alias_kmem __read_mostly; static struct trie *trie_local = NULL, *trie_main = NULL; +static inline struct tnode *node_parent(struct node *node) +{ + struct tnode *ret; + + ret = (struct tnode *)(node->parent & ~NODE_TYPE_MASK); + return rcu_dereference(ret); +} + +static inline void node_set_parent(struct node *node, struct tnode *ptr) +{ + rcu_assign_pointer(node->parent, + (unsigned long)ptr | NODE_TYPE(node)); +} /* rcu_read_lock needs to be hold by caller from readside */ @@ -446,7 +452,7 @@ static void tnode_put_child_reorg(struct tnode *tn, int i, struct node *n, int w tn->full_children++; if (n) - NODE_SET_PARENT(n, tn); + node_set_parent(n, tn); rcu_assign_pointer(tn->child[i], n); } @@ -481,7 +487,7 @@ static struct node *resize(struct trie *t, struct tnode *tn) continue; /* compress one level */ - NODE_SET_PARENT(n, NULL); + node_set_parent(n, NULL); tnode_free(tn); return n; } @@ -636,7 +642,7 @@ static struct node *resize(struct trie *t, struct tnode *tn) /* compress one level */ - NODE_SET_PARENT(n, NULL); + node_set_parent(n, NULL); tnode_free(tn); return n; } @@ -961,24 +967,21 @@ fib_find_node(struct trie *t, u32 key) static struct node *trie_rebalance(struct trie *t, struct tnode *tn) { int wasfull; - t_key cindex, key; - struct tnode *tp = NULL; - - key = tn->key; + t_key cindex, key = tn->key; + struct tnode *tp; - while (tn != NULL && NODE_PARENT(tn) != NULL) { - - tp = NODE_PARENT(tn); + 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)); tn = (struct tnode *) resize (t, (struct tnode *)tn); tnode_put_child_reorg((struct tnode *)tp, cindex,(struct node*)tn, wasfull); - if (!NODE_PARENT(tn)) + tp = node_parent((struct node *) tn); + if (!tp) break; - - tn = NODE_PARENT(tn); + tn = tp; } + /* Handle last (top) tnode */ if (IS_TNODE(tn)) tn = (struct tnode*) resize(t, (struct tnode *)tn); @@ -1031,7 +1034,7 @@ fib_insert_node(struct trie *t, int *err, u32 key, int plen) pos = tn->pos + tn->bits; n = tnode_get_child(tn, tkey_extract_bits(key, tn->pos, tn->bits)); - BUG_ON(n && NODE_PARENT(n) != tn); + BUG_ON(n && node_parent(n) != tn); } else break; } @@ -1083,7 +1086,7 @@ fib_insert_node(struct trie *t, int *err, u32 key, int plen) if (t->trie && n == NULL) { /* Case 2: n is NULL, and will just insert a new leaf */ - NODE_SET_PARENT(l, tp); + node_set_parent((struct node *)l, tp); cindex = tkey_extract_bits(key, tp->pos, tp->bits); put_child(t, (struct tnode *)tp, cindex, (struct node *)l); @@ -1114,7 +1117,7 @@ fib_insert_node(struct trie *t, int *err, u32 key, int plen) goto err; } - NODE_SET_PARENT(tn, tp); + node_set_parent((struct node *)tn, tp); missbit = tkey_extract_bits(key, newpos, 1); put_child(t, tn, missbit, (struct node *)l); @@ -1495,12 +1498,13 @@ backtrace: if (chopped_off <= pn->bits) { cindex &= ~(1 << (chopped_off-1)); } else { - if (NODE_PARENT(pn) == NULL) + struct tnode *parent = node_parent((struct node *) pn); + if (!parent) goto failed; /* Get Child's index */ - cindex = tkey_extract_bits(pn->key, NODE_PARENT(pn)->pos, NODE_PARENT(pn)->bits); - pn = NODE_PARENT(pn); + cindex = tkey_extract_bits(pn->key, parent->pos, parent->bits); + pn = parent; chopped_off = 0; #ifdef CONFIG_IP_FIB_TRIE_STATS @@ -1536,7 +1540,7 @@ static int trie_leaf_remove(struct trie *t, t_key key) check_tnode(tn); n = tnode_get_child(tn ,tkey_extract_bits(key, tn->pos, tn->bits)); - BUG_ON(n && NODE_PARENT(n) != tn); + BUG_ON(n && node_parent(n) != tn); } l = (struct leaf *) n; @@ -1551,7 +1555,7 @@ static int trie_leaf_remove(struct trie *t, t_key key) t->revision++; t->size--; - tp = NODE_PARENT(n); + tp = node_parent(n); tnode_free((struct tnode *) n); if (tp) { @@ -1703,7 +1707,7 @@ static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) p = (struct tnode*) trie; /* Start */ } else - p = (struct tnode *) NODE_PARENT(c); + p = node_parent(c); while (p) { int pos, last; @@ -1740,7 +1744,7 @@ static struct leaf *nextleaf(struct trie *t, struct leaf *thisleaf) up: /* No more children go up one step */ c = (struct node *) p; - p = (struct tnode *) NODE_PARENT(p); + p = node_parent(c); } return NULL; /* Ready. Root of trie */ } @@ -2043,7 +2047,7 @@ rescan: } /* Current node exhausted, pop back up */ - p = NODE_PARENT(tn); + p = node_parent((struct node *)tn); if (p) { cindex = tkey_extract_bits(tn->key, p->pos, p->bits)+1; tn = p; @@ -2317,7 +2321,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v) if (v == SEQ_START_TOKEN) return 0; - if (!NODE_PARENT(n)) { + if (!node_parent(n)) { if (iter->trie == trie_local) seq_puts(seq, ":\n"); else