[ofa-general] Question: Verbs API Error code recover

[Wei Fang]

Hi, Dotan:

When I got that error, I quit my program and use ib_rmda_bw prorgam to 
test Infiniband link. It still fails like this:

ib_rdma_bw 10.8.6.3
19068: | port=18515 | ib_port=1 | size=65536 | tx_depth=100 | iters=1000 
| duplex=0 | cma=0 |
19068: Local address:  LID 0x01, QPN 0x2e0404, PSN 0xc39344 RKey 
0x4c003101 VAddr 0x00002a958bc000
19068: Remote address: LID 0x3d9, QPN 0x140404, PSN 0x77012a, RKey 
0x74003100 VAddr 0x00002a958bc000

19068:main: Completion with error at client:
19068:main: Failed status 12: wr_id 3
19068:main: scnt=100, ccnt=0



Dotan Barak wrote:
> Hi.
>
> Wei Fang wrote:
>> Hi, All:
>>
>> I'm new here just some days ago. Right now I'm facing a problem to 
>> using OFED 1.2.5's verb api.   In my programming, I use RDMA Write 
>> function to transfer data ( ibv_post_send ). Then I use ibv_poll_cq 
>> to get this CQ's finish.  Sometimes, ibv_poll_cq's return error is 
>> IBV_WC_RETRY_EXC_ERR (error code is 12).  When this error code 
>> happen,  any next transfer will always fail.  In this case, I have to 
>> restart computer.  Anyone can tell me how to recover this error 
>> without quit program or restart PC?
>>
>
> If you have a completion with status IBV_WC_RETRY_EXC_ERR your QP 
> state will be moved to error, so all of the WR that you will post 
> after this will fail too.
> If you have this failure you need to reconnect the QPs (i don't know 
> why you need to restart the computer in order to fix this ....).
>
>
> I think that you need to check why you got this completion status from 
> the first place (did the remote side close the QP?)
>
> Dotan
>
>

-- 
Best Regards

Wei Fang

Hermes Microvision Inc.

(Tel)       (408)597-8600
(Fax)       (408)597-8601
(Direct Tel)(408)597-8646

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