[ofa-general] iWARP: Zero STag, OFED 1.3 vs 1.4

[Steve Wise]

Actually I see that this is cxgb3 based on your log information.

Try setting num_sge to 0.


Steve Wise wrote:
> Is this with the Chelsio RNIC?
>
>
>
>
> Philip Frey1 wrote:
>>
>> Hello,
>>
>> I recently upgraded from OFED 1.3 to 1.4 and the behaviour of an STag 
>> of zero seems to have changed.
>>
>> Before, the following code worked:
>>
>>         /* create send work request (for synchronization)*/
>>         sge.addr = 0;
>>         sge.length = 0;
>>         sge.lkey = 0;
>>
>>         send_wr.wr_id = tx_wr_id++;
>>         send_wr.next = NULL;
>>         send_wr.sg_list = &sge;
>>         send_wr.num_sge = 1;
>>         send_wr.opcode = IBV_WR_SEND;
>>         send_wr.send_flags = 0;
>>
>>         /* post send synchronization WR */
>>         ret = ibv_post_send(ctx_conn.qp, &send_wr, &bad_wr);
>>         if (ret) {
>>                 msg_Err("RDMA: failed to post send");
>>                 return -1;
>>         }
>>
>> but now it results in the following error:
>>
>> Jan 13 17:34:46 borus kernel: iwch_ev_dispatch - CQE Err qpid 0xa0 
>> opcode 3 status 0x1 type 1 wrid.hi 0x0 wrid.lo 0x80000000
>> Jan 13 17:34:46 borus kernel: post_qp_event - AE qpid 0xa0 opcode 3 
>> status 0x1 type 1 wrid.hi 0x0 wrid.lo 0x80000000
>>
>> I wanted to do a zero-length send w/o a memory region to solve the 
>> issue that the MPA initiator must send the first FPDU.
>>
>> Question1: Why didn't that result in an error before?
>> Question2: Is there a way of doing a zero-length operation w/o having 
>> to create a MR?
>>
>> Many thanks for you advice,
>>  Philip
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>>
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