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

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Date:   Thu, 27 Jan 2022 08:21:07 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, 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 Thu, Jan 27, 2022 at 11:14:37AM +0800, Tony Lu wrote:
> 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. 

This code existed from 2017, it is hard to agree with "urgent" claim.

Thanks