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From: Alex Rosenbaum <rosenbaumalex-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Jason Gunthorpe
	<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Cc: Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Majd Dibbiny <majd-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH V1 rdma-core 1/3] verbs: Enable creating QP with a given source QP number
Date: Thu, 7 Sep 2017 21:46:39 +0300	[thread overview]
Message-ID: <CAFgAxU8QqEQwCMnu=_1hjRVMHJ_242pXykxHuJ9PftxTV77TUw@mail.gmail.com> (raw)
In-Reply-To: <20170907151641.GC20644-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>

On Thu, Sep 7, 2017 at 6:16 PM, Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> wrote:
> On Thu, Sep 07, 2017 at 03:12:05PM +0300, Yishai Hadas wrote:
>> +uint32_t                source_qpn;     /* Source QP number, creation flag IBV_QP_CREATE_SOURCE_QPN should be set */
>
> I think more discussion in the man page is required for this
> feature. Eg that it is a SEND ONLY QP and only works for UD.

Verbs UD QP can handle receive of ingress packets sent with
BTH.DestQPN = ibv_qp->qp_num. This is applicable also in this case.

Also, future implementation might include RC source qpn use case. This
can be accomplished by setting the HCA's QPN to be the same as the
'source qpn' value, and returning that to the user.

We prefer not to limit the API definition in the man page.

Alex
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  parent reply	other threads:[~2017-09-07 18:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-07 12:12 [PATCH V1 rdma-core 0/3] Verbs support for source QPN Yishai Hadas
     [not found] ` <1504786327-820-1-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2017-09-07 12:12   ` [PATCH V1 rdma-core 1/3] verbs: Enable creating QP with a given source QP number Yishai Hadas
     [not found]     ` <1504786327-820-2-git-send-email-yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2017-09-07 15:16       ` Jason Gunthorpe
     [not found]         ` <20170907151641.GC20644-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-09-07 18:46           ` Alex Rosenbaum [this message]
     [not found]             ` <CAFgAxU8QqEQwCMnu=_1hjRVMHJ_242pXykxHuJ9PftxTV77TUw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-07 19:29               ` Jason Gunthorpe
     [not found]                 ` <20170907192909.GA5364-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-09-10  6:54                   ` Alex Rosenbaum
     [not found]                     ` <CAFgAxU8bkhb6tvB=1GUzqW2Dg-43Y+pZkDaXvFOE+5CEMLs6Mg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-11 16:28                       ` Jason Gunthorpe
     [not found]                         ` <20170911162854.GE32117-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-09-12 11:38                           ` Yishai Hadas
2017-09-07 12:12   ` [PATCH V1 rdma-core 2/3] mlx5: Add support for managing " Yishai Hadas
2017-09-07 12:12   ` [PATCH V1 rdma-core 3/3] mlx5: Add support for sending UD packets with source QPN Yishai Hadas
2017-09-13 11:35   ` [PATCH V1 rdma-core 0/3] Verbs support for " Yishai Hadas

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