[ofw] [PATCH] DAPL v2.0: cma: disconnect can block for excessive times waiting for rdma_cm DREP timeout

[Davis, Arlin R]

>-----Original Message-----
>From: Hefty, Sean
>Sent: Friday, December 03, 2010 3:42 PM
>To: Davis, Arlin R; linux-rdma; ofw at lists.openfabrics.org
>Cc: Smith, Stan
>Subject: RE: [PATCH] DAPL v2.0: cma: disconnect can block for excessive times waiting for rdma_cm DREP
>timeout
>
>> @@ -636,13 +637,29 @@ dapls_ib_disconnect(IN DAPL_EP * ep_ptr, IN
>> DAT_CLOSE_FLAGS close_flags)
>>
>>  	/* ABRUPT close, wait for callback and DISCONNECTED state */
>>  	if (close_flags == DAT_CLOSE_ABRUPT_FLAG) {
>> +		DAPL_EVD *evd = NULL;
>> +		DAT_EVENT_NUMBER num = DAT_CONNECTION_EVENT_DISCONNECTED;
>> +
>>  		dapl_os_lock(&ep_ptr->header.lock);
>> -		while (ep_ptr->param.ep_state != DAT_EP_STATE_DISCONNECTED) {
>> +		/* limit DREP waiting, other side could be down */
>> +		while (--drep_time && ep_ptr->param.ep_state !=
>> DAT_EP_STATE_DISCONNECTED) {
>>  			dapl_os_unlock(&ep_ptr->header.lock);
>>  			dapl_os_sleep_usec(10000);
>
>gak - can't you wait on an event using some timeout interval?
>

if rdma_cm would give me separate timeout interval choices
for connect requests and disconnect requests than by all 
means I would use it for this abrupt disconnect timeout/retry 
interval.