linux-kernel - Re: [PATCH v0 1/6] nvme-fabrics: introduce connect

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Date: Fri, 16 Feb 2024 10:49:09 +0100
From: Christoph Hellwig <hch@....de>
To: Daniel Wagner <dwagner@...e.de>
Cc: James Smart <james.smart@...adcom.com>, Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	Hannes Reinecke <hare@...e.de>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v0 1/6] nvme-fabrics: introduce connect_sync option

On Fri, Feb 16, 2024 at 09:45:21AM +0100, Daniel Wagner wrote:
> The TCP and RDMA transport are doing a synchronous connect, meaning the
> syscal returns with the final result, that is. it either failed or
> succeeded.
> 
> This isn't the case for FC. This transport just setups and triggers
> the connect and returns without waiting on the result.

That's really weird and unexpected.  James, can you explain the reason
behind this?

> Introduce a flag
> to allow user space to control the behavior, wait or don't wait.

I'd expect this to be the default, but I'll wait to hear more about
the rationale.  If we keep the async default the option looks sensible.