QoS SL=>VL issue in user mode librdmacm‏

QoS SL=>VL issue in user mode librdmacm‏

[Prasanna Vv]

Hi
I configure QoS in user mode  using librdmacm call:
rdma_set_option(cm_id, RDMA_OPTION_ID,RDMA_OPTION_ID_TOS, &tos, sizeof _tos)

After the connection is established, i query ibv_query_qp (and also 
cm_id->route.path_rec->sl) to check SL, which is correct as per the qos 
choice from qos_policy.config settings.

But the data transfer is not happening in correct VL as per SL=>VL.

For example if SL is 3 the data transfer VL should be 3 (based on 
SL2VLmaptable).
Instead data is always transfered on VL:0, irrepective of SL value.

Interestingly, the same thing is working properly in kernel mode when i 
set tos using the call:
  rdma_set_service_type(cm_id, conn->c_tos);
If i use kernel mode rdma cm, SL=>VL is correct, data transfer post send 
takes place on VL based on SL.

Do you have clue why the user mode libibverb is not tranfering on VL 
based on SL.

Thanks,
Prasanna

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QoS SL=>VL issue in user mode librdmacm‏

[Prasanna Vv]

Hi
I configure QoS in user mode  using librdmacm call:
rdma_set_option(cm_id, RDMA_OPTION_ID,RDMA_OPTION_ID_TOS, &tos, sizeof 
_tos)

After the connection is established, i query ibv_query_qp (and also 
cm_id->route.path_rec->sl) to check SL, which is correct as per the qos 
choice from qos_policy.config settings.

But the data transfer is not happening in correct VL as per SL=>VL.

For example if SL is 3 the data transfer VL should be 3 (based on 
SL2VLmaptable).
Instead data is always transfered on VL:0, irrepective of SL value.

Interestingly, the same thing is working properly in kernel mode when i 
set tos using the call:
  rdma_set_service_type(cm_id, conn->c_tos);
If i use kernel mode rdma cm, SL=>VL is correct, data transfer post send 
takes place on VL based on SL.

Do you have clue why the user mode libibverb is not tranfering on VL 
based on SL.

Thanks,
Prasanna

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