Re: [PATCH for-rc] IB/cma: Allow XRG INI QPs to set their local ACK timeout

[Haakon Bugge]

> On 9 Feb 2022, at 16:04, Leon Romanovsky <leon@xxxxxxxxxx> wrote:
> 
> On Wed, Feb 09, 2022 at 02:23:00PM +0100, Håkon Bugge wrote:
>> XRC INI QPs should be able to adjust their local ACK timeout.
>> 
>> Fixes: 2c1619edef61 ("IB/cma: Define option to set ack timeout and pack tos_set")
>> Signed-off-by: Håkon Bugge <haakon.bugge@xxxxxxxxxx>
>> Suggested-by: Avneesh Pant <avneesh.pant@xxxxxxxxxx>
>> 
>> ---
>> 
>> To avoid excessive discussions around the *if (WARN_ON( ...*
>> construct, just saying that it has been sanctioned by Jason here:
>> 
>> https://lore.kernel.org/linux-rdma/20210413135120.GT7405@xxxxxxxxxx/
> 
> And I think that this is wrong, because it cane be triggered by user.
> 1. Create cm_id with any QP type you want - ucma_create_id()
> 2. Call to set option - ucma_set_option()
> 3. See WARN_ON.

Yes, this one is callable from user-space. Right. Will send a v2.


Thxs, Håkon

> 
> Thanks
> 
>> ---
>> drivers/infiniband/core/cma.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
>> index 0f5f0d7..006ea9c 100644
>> --- a/drivers/infiniband/core/cma.c
>> +++ b/drivers/infiniband/core/cma.c
>> @@ -2811,7 +2811,7 @@ int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
>> {
>> 	struct rdma_id_private *id_priv;
>> 
>> -	if (id->qp_type != IB_QPT_RC)
>> +	if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI))
>> 		return -EINVAL;
>> 
>> 	id_priv = container_of(id, struct rdma_id_private, id);
>> -- 
>> 1.8.3.1