* why ibv_wc src_qp is zero
@ 2019-08-21 12:14 Liu, Changcheng
2019-08-21 12:25 ` Jason Gunthorpe
0 siblings, 1 reply; 3+ messages in thread
From: Liu, Changcheng @ 2019-08-21 12:14 UTC (permalink / raw)
To: linux-rdma
Hi all,
Does anyone know the usage of the src_qp field in struct ibv_wc?
I’m using RC transport type with only Send Operation on Send Queue.
On the requester side, when SQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value.
On the responder side, when RQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value too.
Why the ibv_wc::src_qp field is zero instead of recording the peer's qp number?
--Thanks
Changcheng
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: why ibv_wc src_qp is zero
2019-08-21 12:14 why ibv_wc src_qp is zero Liu, Changcheng
@ 2019-08-21 12:25 ` Jason Gunthorpe
2019-08-21 12:30 ` Liu, Changcheng
0 siblings, 1 reply; 3+ messages in thread
From: Jason Gunthorpe @ 2019-08-21 12:25 UTC (permalink / raw)
To: Liu, Changcheng; +Cc: linux-rdma
On Wed, Aug 21, 2019 at 08:14:36PM +0800, Liu, Changcheng wrote:
> Hi all,
> Does anyone know the usage of the src_qp field in struct ibv_wc?
>
> I’m using RC transport type with only Send Operation on Send Queue.
> On the requester side, when SQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value.
> On the responder side, when RQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value too.
> Why the ibv_wc::src_qp field is zero instead of recording the peer's qp number?
It is only supported for UD QPs
Jason
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: why ibv_wc src_qp is zero
2019-08-21 12:25 ` Jason Gunthorpe
@ 2019-08-21 12:30 ` Liu, Changcheng
0 siblings, 0 replies; 3+ messages in thread
From: Liu, Changcheng @ 2019-08-21 12:30 UTC (permalink / raw)
To: Jason Gunthorpe; +Cc: linux-rdma
On 09:25 Wed 21 Aug, Jason Gunthorpe wrote:
> On Wed, Aug 21, 2019 at 08:14:36PM +0800, Liu, Changcheng wrote:
> > Hi all,
> > Does anyone know the usage of the src_qp field in struct ibv_wc?
> >
> > I’m using RC transport type with only Send Operation on Send Queue.
> > On the requester side, when SQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value.
> > On the responder side, when RQ WR is finished, there’s one WCE is on CQ. ibv_wc::src_qp is checked with zero value too.
> > Why the ibv_wc::src_qp field is zero instead of recording the peer's qp number?
>
> It is only supported for UD QPs
Thanks a lot for your info. I'll check it the protocol.
--Thanks
Changcheng
>
> Jason
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-08-21 12:14 why ibv_wc src_qp is zero Liu, Changcheng
2019-08-21 12:25 ` Jason Gunthorpe
2019-08-21 12:30 ` Liu, Changcheng
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