netdev - Re: [PATCH v1 net-next 05/15] nvme-tcp: Add DDP offload control path

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Message-ID: <CAKKgK4xvS9SeM3NmNKDNe5oFxxfi0m_=iHCXeXX0DGcgzG_BBA@mail.gmail.com>
Date:   Tue, 15 Dec 2020 15:33:50 +0200
From:   Shai Malin <malin1024@...il.com>
To:     Boris Pismenny <borispismenny@...il.com>,
        Boris Pismenny <borisp@...lanox.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "saeedm@...dia.com" <saeedm@...dia.com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "axboe@...com" <axboe@...com>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "edumazet@...gle.com" <edumazet@...gle.com>
Cc:     Yoray Zack <yorayz@...lanox.com>,
        "yorayz@...dia.com" <yorayz@...dia.com>,
        "boris.pismenny@...il.com" <boris.pismenny@...il.com>,
        Ben Ben-Ishay <benishay@...lanox.com>,
        "benishay@...dia.com" <benishay@...dia.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        "ogerlitz@...dia.com" <ogerlitz@...dia.com>,
        Shai Malin <smalin@...vell.com>,
        Ariel Elior <aelior@...vell.com>,
        Michal Kalderon <mkalderon@...vell.com>,
        Shai Malin <malin1024@...il.com>
Subject: Re: [PATCH v1 net-next 05/15] nvme-tcp: Add DDP offload control path

On 12/14/2020 08:38, Boris Pismenny wrote:
> On 10/12/2020 19:15, Shai Malin wrote:
> > diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index c0c33320fe65..ef96e4a02bbd 100644
> > --- a/drivers/nvme/host/tcp.c
> > +++ b/drivers/nvme/host/tcp.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/blk-mq.h>
> >  #include <crypto/hash.h>
> >  #include <net/busy_poll.h>
> > +#include <net/tcp_ddp.h>
> >
> >  #include "nvme.h"
> >  #include "fabrics.h"
> > @@ -62,6 +63,7 @@ enum nvme_tcp_queue_flags {
> >       NVME_TCP_Q_ALLOCATED    = 0,
> >       NVME_TCP_Q_LIVE         = 1,
> >       NVME_TCP_Q_POLLING      = 2,
> > +     NVME_TCP_Q_OFFLOADS     = 3,
> >  };
> >
> > The same comment from the previous version - we are concerned that perhaps
> > the generic term "offload" for both the transport type (for the Marvell work)
> > and for the DDP and CRC offload queue (for the Mellanox work) may be
> > misleading and confusing to developers and to users.
> >
> > As suggested by Sagi, we can call this NVME_TCP_Q_DDP.
> >
>
> While I don't mind changing the naming here. I wonder  why not call the
> toe you use TOE and not TCP_OFFLOAD, and then offload is free for this?

Thanks - please do change the name to NVME_TCP_Q_DDP.
The Marvell nvme-tcp-offload patch series introducing the offloading of both the
TCP as well as the NVMe/TCP layer, therefore it's not TOE.

>
> Moreover, the most common use of offload in the kernel is for partial offloads
> like this one, and not for full offloads (such as toe).

Because each vendor might implement a different partial offload I
suggest naming it
with the specific technique which is used, as was suggested - NVME_TCP_Q_DDP.