linux-kernel - RE: [PATCH] r8152: stop submitting rx for -EPROTO

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Date:   Fri, 1 Oct 2021 03:26:48 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>
CC:     Jason-ch Chen <jason-ch.chen@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "Project_Global_Chrome_Upstream_Group@...iatek.com" 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "hsinyi@...gle.com" <hsinyi@...gle.com>,
        nic_swsd <nic_swsd@...ltek.com>
Subject: RE: [PATCH] r8152: stop submitting rx for -EPROTO

> Alan Stern <stern@...land.harvard.edu>
> [...]
> > There has been some discussion about this in the past.
> >
> > In general, -EPROTO is almost always a non-recoverable error.
> 
> Excuse me. I am confused about the above description.
> I got -EPROTO before, when I debugged another issue.
> However, the bulk transfer still worked after I resubmitted
> the transfer. I didn't do anything to recover it. That is why
> I do resubmission for -EPROTO.

I check the Linux driver and the xHCI spec.
The driver gets -EPROTO for bulk transfer, when the host
returns COMP_USB_TRANSACTION_ERROR.
According to the spec of xHCI, USB TRANSACTION ERROR
means the host did not receive a valid response from the
device (Timeout, CRC, Bad PID, unexpected NYET, etc.).
It seems to be reasonable why resubmission sometimes works.

Best Regards,
Hayes