On 4/22/2014 2:41 PM, Hefty, Sean wrote:
>> +static u8 cma_get_ib_subnet_timeout(struct rdma_cm_id *id)
>> +{
>> + struct ib_port_attr attr;
>> + int ret;
>> +
>> + ret = ib_query_port(id->device, id->port_num, &attr);
>> + return ret == 0 ? attr.subnet_timeout : 18;
>> +}
>
> Can we query the port once (or only on a change) and cache the result, rather
> than querying it for every request?
To be IBA spec compliant, SubnetTimeout could change so some new local
event would need to be added and handled to avoid the requerying.
In practice, however, that's not very likely AFAIK.
-- Hal
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