linux-kernel - RE: [PATCH v2] hv_netvsc: Fix netvsc_start

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Message-ID: <MW2PR2101MB10522D4D5EBAB469FE5B4D8BD7AA0@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Thu, 30 Apr 2020 00:06:09 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>
CC:     "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>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: RE: [PATCH v2] hv_netvsc: Fix netvsc_start_xmit's return type

From: Nathan Chancellor <natechancellor@...il.com> Sent: Tuesday, April 28, 2020 10:55 AM
> 
> Do note that netvsc_xmit still returns int because netvsc_xmit has a
> potential return from netvsc_vf_xmit, which does not return netdev_tx_t
> because of the call to dev_queue_xmit.
> 
> I am not sure if that is an oversight that was introduced by
> commit 0c195567a8f6e ("netvsc: transparent VF management") or if
> everything works properly as it is now.
> 
> My patch is purely concerned with making the definition match the
> prototype so it should be NFC aside from avoiding the CFI panic.
> 

While it probably works correctly now, I'm not too keen on just
changing the return type for netvsc_start_xmit() and assuming the
'int' that is returned from netvsc_xmit() will be correctly mapped to
the netdev_tx_t enum type.  While that mapping probably happens
correctly at the moment, this really should have a more holistic fix.

Nathan -- are you willing to look at doing the more holistic fix?  Or
should we see about asking Haiyang Zhang to do it?

Michael