netdev - Re: [RFC PATCH net-next 0/6] net/smc: Spread workload over multiple cores

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Date:   Thu, 27 Jan 2022 11:14:37 +0800
From:   Tony Lu <tonylu@...ux.alibaba.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Leon Romanovsky <leon@...nel.org>, kgraul@...ux.ibm.com,
        kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org,
        RDMA mailing list <linux-rdma@...r.kernel.org>
Subject: Re: [RFC PATCH net-next 0/6] net/smc: Spread workload over multiple
 cores

On Wed, Jan 26, 2022 at 11:28:06AM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 26, 2022 at 03:23:22PM +0800, Tony Lu wrote:
> > On Sun, Jan 16, 2022 at 11:00:33AM +0200, Leon Romanovsky wrote:
> > > 
> > > Please CC RDMA mailing list next time.
> > > 
> > > Why didn't you use already existed APIs in drivers/infiniband/core/cq.c?
> > > ib_cq_pool_get() will do most if not all of your open-coded CQ spreading
> > > logic.
> > 
> > I am working on replacing with ib_cq_pool_get(), this need ib_poll_context
> > to indicate the poller which provides by ib_poll_handler(). It's okay
> > for now, but for the callback function. When it polled a ib_wc, it
> > would call wc->wr_cqe->done(cq, wc), which is the union with wr_id. The
> > wr_id is heavily used in SMC.
> 
> Part of using the new interface is converting to use wr_cqe, you
> should just do that work instead of trying to duplicate a core API in
> a driver.

Thanks for your advice. This patch set aims to improve performance with
current API in SMC protocol, which is more urgent. I will do that work
with new API in the next separate patch.That work may require a lot of
revisions, I will issue patches after a full discussion with Karsten
and finalization of the solution.

Thanks,
Tony Lu