From: Jason Gunthorpe <jgg@nvidia.com>
To: Bob Pearson <rpearsonhpe@gmail.com>
Cc: "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: another change breaks rxe
Date: Fri, 30 Oct 2020 08:47:32 -0300 [thread overview]
Message-ID: <20201030114732.GC2620339@nvidia.com> (raw)
In-Reply-To: <32fa9c9f-5816-7474-b821-ccccd4cb5af0@gmail.com>
On Fri, Oct 30, 2020 at 12:41:12AM -0500, Bob Pearson wrote:
> breaks rxe because it does use IB_USER_VERBS_CMD_POST_SEND. rxe
> posts wqes to a work queue in shared memory and then calls
> ibv_post_send with zero wqes as a doorbell to the kernel which uses
> this as a hint to go read the shared memory.
Gah, siw and rxe are open coding this stuff (wrongly!) in rdma-core
This would be a lot better to use an eventfd
Jason
next prev parent reply other threads:[~2020-10-30 11:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 5:41 another change breaks rxe Bob Pearson
2020-10-30 11:47 ` Jason Gunthorpe [this message]
2020-10-30 12:50 ` Bernard Metzler
2020-10-30 16:28 ` Jason Gunthorpe
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