linux-kernel - Re: [PATCH] RDMA/mana_ib: Use v2 version of cfg_rx_steer

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Message-ID: <20230508060938.GA6195@unreal>
Date:   Mon, 8 May 2023 09:09:38 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     Long Li <longli@...rosoft.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/mana_ib: Use v2 version of cfg_rx_steer_req to
 enable RX coalescing

On Sun, May 07, 2023 at 09:39:27PM +0000, Haiyang Zhang wrote:
> 
> 
> > -----Original Message-----
> > From: Leon Romanovsky <leon@...nel.org>
> > Sent: Sunday, May 7, 2023 4:11 AM
> > To: Long Li <longli@...rosoft.com>
> > Cc: Jason Gunthorpe <jgg@...pe.ca>; Ajay Sharma
> > <sharmaajay@...rosoft.com>; Dexuan Cui <decui@...rosoft.com>; KY
> > Srinivasan <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>;
> > Wei Liu <wei.liu@...nel.org>; David S. Miller <davem@...emloft.net>; Eric
> > Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo
> > Abeni <pabeni@...hat.com>; linux-rdma@...r.kernel.org; linux-
> > hyperv@...r.kernel.org; netdev@...r.kernel.org; linux-
> > kernel@...r.kernel.org
> > Subject: Re: [PATCH] RDMA/mana_ib: Use v2 version of cfg_rx_steer_req to
> > enable RX coalescing
> > 
> > On Fri, May 05, 2023 at 11:51:48AM -0700, longli@...uxonhyperv.com
> > wrote:
> > > From: Long Li <longli@...rosoft.com>
> > >
> > > With RX coalescing, one CQE entry can be used to indicate multiple packets
> > > on the receive queue. This saves processing time and PCI bandwidth over
> > > the CQ.
> > >
> > > Signed-off-by: Long Li <longli@...rosoft.com>
> > > ---
> > >  drivers/infiniband/hw/mana/qp.c |  5 ++++-
> > >  include/net/mana/mana.h         | 17 +++++++++++++++++
> > >  2 files changed, 21 insertions(+), 1 deletion(-)
> > 
> > Why didn't you change mana_cfg_vport_steering() too?
> 
> The mana_cfg_vport_steering() is for mana_en (Enthernet) driver, not the
> mana_ib driver.
> 
> The changes for mana_en will be done in a separate patch together with
> changes for mana_en RX code patch to support multiple packets / CQE.

I'm aware of the difference between mana_en and mana_ib.

The change you proposed doesn't depend on "support multiple packets / CQE."
and works perfectly with one packet/CQE also, does it?

Thanks

> 
> Thanks,
> - Haiyang
>