netdev - RE: [PATCH v7 04/23] Revert "nvme-tcp: remove the unused queue_size member in nvme_tcp

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Date:   Wed, 26 Oct 2022 11:52:53 +0000
From:   Shai Malin <smalin@...dia.com>
To:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>,
        Aurelien Aptel <aaptel@...dia.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        Chaitanya Kulkarni <chaitanyak@...dia.com>,
        Or Gerlitz <ogerlitz@...dia.com>,
        Yoray Zack <yorayz@...dia.com>,
        Boris Pismenny <borisp@...dia.com>,
        "aurelien.aptel@...il.com" <aurelien.aptel@...il.com>,
        "malin1024@...il.com" <malin1024@...il.com>
Subject: RE: [PATCH v7 04/23] Revert "nvme-tcp: remove the unused queue_size
 member in nvme_tcp_queue"

On Wed, 26 Oct 2022 at 12:02, Sagi Grimberg <sagi@...mberg.me> wrote:
> >> This reverts commit fb8745d040ef5b9080003325e56b91fefe1022bb.
> >>
> >> The newly added NVMeTCP offload requires the field
> >> nvme_tcp_queue->queue_size in the patch
> >> "nvme-tcp: Add DDP offload control path" in nvme_tcp_offload_socket().
> >> The queue size is part of struct ulp_ddp_config
> >> parameters.
> >
> > Please never do reverts if you just bring something back for an entirely
> > differenet reason.
> 
> Agreed.

Sure.

> 
> > And I think we need a really good justification of
> > why you have a code path that can get the queue struct and not the
> > controller, which really should not happen.
> 
> What is wrong with just using either ctrl->sqsize/NVME_AQ_DEPTH based
> on the qid?

Thanks, we will use ctrl->sqsize.
No need to use NVME_AQ_DEPTH as the offload is used only with IO queues.