linux-kernel - Re: [PATCH v4 14/27] IB/Verbs: Reform cma_acquire

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Date:	Thu, 16 Apr 2015 15:35:15 +0200
From:	Michael Wang <yun.wang@...fitbricks.com>
To:	Hal Rosenstock <hal@....mellanox.co.il>
CC:	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Mike Marciniszyn <infinipath@...el.com>,
	Eli Cohen <eli@...lanox.com>,
	Faisal Latif <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Ira Weiny <ira.weiny@...el.com>, Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v4 14/27] IB/Verbs: Reform cma_acquire_dev()



On 04/16/2015 03:19 PM, Hal Rosenstock wrote:
[snip]
>>  
>> +static inline int cma_validate_port(struct ib_device *device, u8 port,
>> +				      union ib_gid *gid, int dev_type)
>> +{
>> +	u8 found_port;
>> +	int ret = -ENODEV;
>> +
>> +	if ((dev_type == ARPHRD_INFINIBAND) && !rdma_tech_ib(device, port))
>> +		return ret;
>> +
>> +	if ((dev_type != ARPHRD_INFINIBAND) && rdma_tech_ib(device, port))
>> +		return ret;
>> +
>> +	ret = ib_find_cached_gid(device, gid, &found_port, NULL);
>> +
>> +	if (!ret && (port == found_port))
>> +		return 0;
>> +
>> +	return ret;
> 
> Should the case where ret = 0 and port != found_port need to be handled
> the same as currently ? It looks different to me since in this case the
> port will be saved into id_priv->id.port_num whereas currently it isn't.

I get your point :-) what about:

	ret = ib_find_cached_gid(device, gid, &found_port, NULL);
	if (port != found_port)
		return -ENODEV;

	return ret

Regards,
Michael Wang

> 
> -- Hal
> 
>> +}
>> +
>>  static int cma_acquire_dev(struct rdma_id_private *id_priv,
>>  			   struct rdma_id_private *listen_id_priv)
>>  {
>>  	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
>>  	struct cma_device *cma_dev;
>> -	union ib_gid gid, iboe_gid;
>> +	union ib_gid gid, iboe_gid, *gidp;
>>  	int ret = -ENODEV;
>> -	u8 port, found_port;
>> -	enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
>> -		IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
>> +	u8 port;
>>  
>> -	if (dev_ll != IB_LINK_LAYER_INFINIBAND &&
>> +	if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
>>  	    id_priv->id.ps == RDMA_PS_IPOIB)
>>  		return -EINVAL;
>>  
>> @@ -391,41 +409,36 @@ static int cma_acquire_dev(struct rdma_id_private *id_priv,
>>  
>>  	memcpy(&gid, dev_addr->src_dev_addr +
>>  	       rdma_addr_gid_offset(dev_addr), sizeof gid);
>> -	if (listen_id_priv &&
>> -	    rdma_port_get_link_layer(listen_id_priv->id.device,
>> -				     listen_id_priv->id.port_num) == dev_ll) {
>> +
>> +	if (listen_id_priv) {
>>  		cma_dev = listen_id_priv->cma_dev;
>>  		port = listen_id_priv->id.port_num;
>> -		if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
>> -		    rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
>> -			ret = ib_find_cached_gid(cma_dev->device, &iboe_gid,
>> -						 &found_port, NULL);
>> -		else
>> -			ret = ib_find_cached_gid(cma_dev->device, &gid,
>> -						 &found_port, NULL);
>> +		gidp = rdma_tech_iboe(cma_dev->device, port) ?
>> +		       &iboe_gid : &gid;
>>  
>> -		if (!ret && (port  == found_port)) {
>> -			id_priv->id.port_num = found_port;
>> +		ret = cma_validate_port(cma_dev->device, port, gidp,
>> +					dev_addr->dev_type);
>> +		if (!ret) {
>> +			id_priv->id.port_num = port;
>>  			goto out;
>>  		}
>>  	}
>> +
>>  	list_for_each_entry(cma_dev, &dev_list, list) {
>>  		for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
>>  			if (listen_id_priv &&
>>  			    listen_id_priv->cma_dev == cma_dev &&
>>  			    listen_id_priv->id.port_num == port)
>>  				continue;
>> -			if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
>> -				if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
>> -				    rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
>> -					ret = ib_find_cached_gid(cma_dev->device, &iboe_gid, &found_port, NULL);
>> -				else
>> -					ret = ib_find_cached_gid(cma_dev->device, &gid, &found_port, NULL);
>> -
>> -				if (!ret && (port == found_port)) {
>> -					id_priv->id.port_num = found_port;
>> -					goto out;
>> -				}
>> +
>> +			gidp = rdma_tech_iboe(cma_dev->device, port) ?
>> +			       &iboe_gid : &gid;
>> +
>> +			ret = cma_validate_port(cma_dev->device, port, gidp,
>> +						dev_addr->dev_type);
>> +			if (!ret) {
>> +				id_priv->id.port_num = port;
>> +				goto out;
>>  			}
>>  		}
>>  	}
> 
--
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