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| author | Pavel Emelyanov <xemul@openvz.org> | 2007-11-26 20:12:58 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:55:04 -0800 |
| commit | 82d8a867ffaed7fe58e789103b32c0fc6b79dafd (patch) | |
| tree | 091c5c972c97a4a3433b9c291990068115fbdbfd /net/core/dev.c | |
| parent | 8d8ad9d7c4bfe79bc91b7fc419ecfb9dcdfe6a51 (diff) | |
| download | lwn-82d8a867ffaed7fe58e789103b32c0fc6b79dafd.tar.gz lwn-82d8a867ffaed7fe58e789103b32c0fc6b79dafd.zip | |
[NET]: Make macro to specify the ptype_base size
Currently this size is 16, but as the comment says this
is so only because all the chains (except one) has the
length 1. I think, that some day this may change, so
growing this hash will be much easier.
Besides, symbolic names are read better than magic constants.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index d0e23d8310ff..d0d2675aaed6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -150,8 +150,11 @@ * 86DD IPv6 */ +#define PTYPE_HASH_SIZE (16) +#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) + static DEFINE_SPINLOCK(ptype_lock); -static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */ +static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; static struct list_head ptype_all __read_mostly; /* Taps */ #ifdef CONFIG_NET_DMA @@ -362,7 +365,7 @@ void dev_add_pack(struct packet_type *pt) if (pt->type == htons(ETH_P_ALL)) list_add_rcu(&pt->list, &ptype_all); else { - hash = ntohs(pt->type) & 15; + hash = ntohs(pt->type) & PTYPE_HASH_MASK; list_add_rcu(&pt->list, &ptype_base[hash]); } spin_unlock_bh(&ptype_lock); @@ -391,7 +394,7 @@ void __dev_remove_pack(struct packet_type *pt) if (pt->type == htons(ETH_P_ALL)) head = &ptype_all; else - head = &ptype_base[ntohs(pt->type) & 15]; + head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; list_for_each_entry(pt1, head, list) { if (pt == pt1) { @@ -1420,7 +1423,8 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) } rcu_read_lock(); - list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) { + list_for_each_entry_rcu(ptype, + &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { if (ptype->type == type && !ptype->dev && ptype->gso_segment) { if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { err = ptype->gso_send_check(skb); @@ -2077,7 +2081,8 @@ ncls: goto out; type = skb->protocol; - list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) { + list_for_each_entry_rcu(ptype, + &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { if (ptype->type == type && (!ptype->dev || ptype->dev == skb->dev)) { if (pt_prev) @@ -2525,7 +2530,7 @@ static void *ptype_get_idx(loff_t pos) ++i; } - for (t = 0; t < 16; t++) { + for (t = 0; t < PTYPE_HASH_SIZE; t++) { list_for_each_entry_rcu(pt, &ptype_base[t], list) { if (i == pos) return pt; @@ -2559,10 +2564,10 @@ static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) hash = 0; nxt = ptype_base[0].next; } else - hash = ntohs(pt->type) & 15; + hash = ntohs(pt->type) & PTYPE_HASH_MASK; while (nxt == &ptype_base[hash]) { - if (++hash >= 16) + if (++hash >= PTYPE_HASH_SIZE) return NULL; nxt = ptype_base[hash].next; } @@ -4398,7 +4403,7 @@ static int __init net_dev_init(void) goto out; INIT_LIST_HEAD(&ptype_all); - for (i = 0; i < 16; i++) + for (i = 0; i < PTYPE_HASH_SIZE; i++) INIT_LIST_HEAD(&ptype_base[i]); if (register_pernet_subsys(&netdev_net_ops)) |