netdev - Re: [PATCH v12 net-next 1/1] hv_sock: introduce Hyper-V Sockets

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Date:	Tue, 28 Jun 2016 08:42:48 -0700
From:	Rick Jones <rick.jones2@....com>
To:	Dexuan Cui <decui@...rosoft.com>,
	David Miller <davem@...emloft.net>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"cavery@...hat.com" <cavery@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"joe@...ches.com" <joe@...ches.com>
Subject: Re: [PATCH v12 net-next 1/1] hv_sock: introduce Hyper-V Sockets

On 06/28/2016 02:59 AM, Dexuan Cui wrote:
> The idea here is: IMO the syscalls sys_read()/write() shoudn't return
> -ENOMEM, so I have to make sure the buffer allocation succeeds?
>
> I tried to use kmalloc with __GFP_NOFAIL, but I hit a warning in
> in mm/page_alloc.c:
> WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
>
> What error code do you think I should return?
> EAGAIN, ERESTARTSYS, or something else?
>
> May I have your suggestion? Thanks!

What happens as far as errno is concerned when an application makes a 
read() call against a (say TCP) socket associated with a connection 
which has been reset?  Is it limited to those errno values listed in the 
read() manpage, or does it end-up getting an errno value from those 
listed in the recv() manpage?  Or, perhaps even one not (presently) 
listed in either?

rick jones