netdev - Re: [Patch 3/3] IB/ib_cm: hang in cm_destroy

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Date:	Wed, 23 Apr 2014 13:58:10 -0500
From:	Carol Soto <clsoto@...ux.vnet.ibm.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>,
	"roland@...nel.org" <roland@...nel.org>,
	"hal.rosenstock@...il.com" <hal.rosenstock@...il.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"brking@...ux.vnet.ibm.com" <brking@...ux.vnet.ibm.com>
Subject: Re: [Patch 3/3] IB/ib_cm: hang in cm_destroy_id during PCI error
 injection


On 4/23/2014 1:15 PM, Hefty, Sean wrote:
>> Index: b/drivers/infiniband/core/cm.c
>> ===================================================================
>> --- a/drivers/infiniband/core/cm.c
>> +++ b/drivers/infiniband/core/cm.c
>> @@ -161,6 +161,7 @@ struct cm_port {
>>   	struct ib_mad_agent *mad_agent;
>>   	struct kobject port_obj;
>>   	u8 port_num;
>> +	u8 device_fatal;
>>   	struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
>>   };
>>
>> @@ -168,6 +169,7 @@ struct cm_device {
>>   	struct list_head list;
>>   	struct ib_device *ib_device;
>>   	struct device *device;
>> +	struct ib_event_handler event_handler;
>>   	u8 ack_delay;
>>   	struct cm_port *port[0];
>>   };
>> @@ -258,6 +260,10 @@ static int cm_alloc_msg(struct cm_id_pri
>>   	struct ib_mad_agent *mad_agent;
>>   	struct ib_mad_send_buf *m;
>>   	struct ib_ah *ah;
>> +	struct cm_port *port = cm_id_priv->av.port;
>> +
>> +	if (port->device_fatal)
>> +		return -EIO;
>>
>>   	mad_agent = cm_id_priv->av.port->mad_agent;
>>   	ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
>> @@ -290,6 +296,9 @@ static int cm_alloc_response_msg(struct
>>   	struct ib_mad_send_buf *m;
>>   	struct ib_ah *ah;
>>
>> +	if (port->device_fatal)
>> +		return -EIO;
>> +
>>   	ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
>>   				  mad_recv_wc->recv_buf.grh, port->port_num);
>>   	if (IS_ERR(ah))
>> @@ -3764,6 +3773,33 @@ static void cm_remove_port_fs(struct cm_
>>   	kobject_put(&port->port_obj);
>>   }
>>
>> +static void ib_cm_event_handler(struct ib_event_handler *handler,
>> +				struct ib_event *event)
>> +{
>> +	struct cm_device *cm_dev;
>> +	struct cm_port *port = NULL;
>> +
>> +	cm_dev = container_of(handler, struct cm_device, event_handler);
>> +	switch (event->event) {
>> +	case IB_EVENT_PORT_ACTIVE:
>> +		port = cm_dev->port[event->element.port_num - 1];
>> +		if (port == NULL)
>> +			return;
>> +		if (port->port_num == event->element.port_num)
>> +			port->device_fatal = 0;
>> +		break;
>> +	case IB_EVENT_DEVICE_FATAL:
>> +		port = cm_dev->port[event->element.port_num - 1];
>> +		if (port == NULL)
>> +			return;
>> +		if (port->port_num == event->element.port_num)
>> +			port->device_fatal = 1;
>> +		break;
> This is a device level event, not a port event.  The port_num value may not be valid.
The first patch of the series(IB/mlx4: send a IB_EVENT_DEVICE_FATAL to 
users during PCI error injection), when mlx4 send the IB_EVENT_DEVICE_FATAL
event I am passing the port number to that field so in that way I was 
able to make it work. Any other suggestions are welcome.

Thanks
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