netdev - Re: [PATCH 02/11] IB/ipoib: Return IPoIB devices matching connection parameters

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Message-ID: <20150615172210.GB14982@obsidianresearch.com>
Date:	Mon, 15 Jun 2015 11:22:10 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Haggai Eran <haggaie@...lanox.com>
Cc:	Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, Liran Liss <liranl@...lanox.com>,
	Guy Shapiro <guysh@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Yotam Kenneth <yotamke@...lanox.com>
Subject: Re: [PATCH 02/11] IB/ipoib: Return IPoIB devices matching connection
 parameters

On Mon, Jun 15, 2015 at 11:47:07AM +0300, Haggai Eran wrote:

> +/* Called with an RCU read lock taken */

Add _rcu to the name? That is the standard convention.

> +/* returns an IPoIB netdev on top a given ipoib device matching a pkey_index
> + * and address, if one exists. */
> +static struct net_device *ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
> +						    const union ib_gid *gid,
> +						    u16 pkey_index,
> +						    const struct sockaddr *addr)
> +{
> +	struct ipoib_dev_priv *child_priv;
> +	struct net_device *net_dev = NULL;
> +
> +	if (priv->pkey_index == pkey_index &&
> +	    (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
> +		net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
> +		if (net_dev)
> +			return net_dev;

As I said already, this should not even look at the sockaddr unless
there are multiple possible hits on the other parameters, and there
should be a comment explaining the sockaddr is only a hack to make up
for having an incomplete LLADDR.

That way people not using same guid children do not get incorrect
functionality..

> +static struct net_device *ipoib_get_net_dev_by_params(
> +		struct ib_device *dev, u8 port, u16 pkey,
> +		const union ib_gid *gid, const struct sockaddr *addr)

[..]

> +	ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
> +	if (ret)
> +		return NULL;
> +
> +	if (!rdma_protocol_ib(dev, port))
> +		return NULL;

This if should be first I'd think.


> +	dev_list = ib_get_client_data(dev, &ipoib_client);
> +	if (!dev_list)
> +		return NULL;

Is the locking OK here? This access protected by lists_rwsem -
but for instance ib_unregister_device holds only the device_mutex when
calling client->remove, which kfree's dev_list. Looks wrong to me.

Jason
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