From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sagi Grimberg Subject: Re: [PATCH] IB/core: Don't drain the receive queue for srq attached queue-pair Date: Tue, 26 Apr 2016 22:18:00 +0300 Message-ID: <571FBEE8.20009@grimberg.me> References: <1461682538-19647-1-git-send-email-sagi@grimberg.me> <571F841D.3010909@opengridcomputing.com> <20160426154328.GA12398@lst.de> <912C9E71-05E3-4ED9-9B41-137E131E3A71@oracle.com> <571F9084.2040506@opengridcomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <571F9084.2040506-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Steve Wise , Chuck Lever , Christoph Hellwig Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.org >>> On Apr 26, 2016, at 11:43 AM, Christoph Hellwig wrote: >>> >>> Just curious: what takes care of draining SRQs when we unregister them >>> after all queues are gone? >> >> Conversely, I would think that a consumer that uses SRQ >> would want a similar drain mechanism to guarantee there >> are no more posted Receives for the associated QP, and >> thus it is safe to destroy it. > > I don't think there is anything now that handles draining an SRQ, nor > ensuring a QP's RQEs are completed/consumed from its SRQ when draining > the QP. There is no "QP's RQEs" in s SRQ, this is a misconception. A SRQ is just a bunch of receive buffers. The QP is assigned and completion time (when the incoming recv is processed). -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html