linux-kernel - Re: [PATCH v7 15/16] openvswitch: use new hashtable implementation

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Date:	Mon, 29 Oct 2012 09:29:31 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	torvalds@...ux-foundation.org, tj@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, paul.gortmaker@...driver.com,
	davem@...emloft.net, rostedt@...dmis.org, mingo@...e.hu,
	ebiederm@...ssion.com, aarcange@...hat.com, ericvh@...il.com,
	netdev@...r.kernel.org, josh@...htriplett.org,
	eric.dumazet@...il.com, axboe@...nel.dk, agk@...hat.com,
	dm-devel@...hat.com, neilb@...e.de, ccaulfie@...hat.com,
	teigland@...hat.com, Trond.Myklebust@...app.com,
	bfields@...ldses.org, fweisbec@...il.com, jesse@...ira.com,
	venkat.x.venkatsubra@...cle.com, ejt@...hat.com,
	snitzer@...hat.com, edumazet@...gle.com, linux-nfs@...r.kernel.org,
	dev@...nvswitch.org, rds-devel@....oracle.com, lw@...fujitsu.com
Subject: Re: [PATCH v7 15/16] openvswitch: use new hashtable implementation

* Sasha Levin (levinsasha928@...il.com) wrote:
[...]
> -static struct hlist_head *hash_bucket(struct net *net, const char *name)
> -{
> -	unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
> -	return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
> -}
> -
>  /**
>   *	ovs_vport_locate - find a port that has already been created
>   *
> @@ -84,13 +76,12 @@ static struct hlist_head *hash_bucket(struct net *net, const char *name)
>   */
>  struct vport *ovs_vport_locate(struct net *net, const char *name)
>  {
> -	struct hlist_head *bucket = hash_bucket(net, name);
>  	struct vport *vport;
>  	struct hlist_node *node;
> +	int key = full_name_hash(name, strlen(name));
>  
> -	hlist_for_each_entry_rcu(vport, node, bucket, hash_node)
> -		if (!strcmp(name, vport->ops->get_name(vport)) &&
> -		    net_eq(ovs_dp_get_net(vport->dp), net))
> +	hash_for_each_possible_rcu(dev_table, vport, node, hash_node, key)

Is applying hash_32() on top of full_name_hash() needed and expected ?

Thanks,

Mathieu

> +		if (!strcmp(name, vport->ops->get_name(vport)))
>  			return vport;
>  
>  	return NULL;
> @@ -174,7 +165,8 @@ struct vport *ovs_vport_add(const struct vport_parms *parms)
>  
>  	for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
>  		if (vport_ops_list[i]->type == parms->type) {
> -			struct hlist_head *bucket;
> +			int key;
> +			const char *name;
>  
>  			vport = vport_ops_list[i]->create(parms);
>  			if (IS_ERR(vport)) {
> @@ -182,9 +174,9 @@ struct vport *ovs_vport_add(const struct vport_parms *parms)
>  				goto out;
>  			}
>  
> -			bucket = hash_bucket(ovs_dp_get_net(vport->dp),
> -					     vport->ops->get_name(vport));
> -			hlist_add_head_rcu(&vport->hash_node, bucket);
> +			name = vport->ops->get_name(vport);
> +			key = full_name_hash(name, strlen(name));
> +			hash_add_rcu(dev_table, &vport->hash_node, key);
>  			return vport;
>  		}
>  	}
> @@ -225,7 +217,7 @@ void ovs_vport_del(struct vport *vport)
>  {
>  	ASSERT_RTNL();
>  
> -	hlist_del_rcu(&vport->hash_node);
> +	hash_del_rcu(&vport->hash_node);
>  
>  	vport->ops->destroy(vport);
>  }
> -- 
> 1.7.12.4
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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