netdev - RE: Ethernet issue on imx6

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Date: Fri, 13 Oct 2023 10:16:27 +0000
From: Wei Fang <wei.fang@....com>
To: Miquel Raynal <miquel.raynal@...tlin.com>, "Russell King (Oracle)"
	<linux@...linux.org.uk>
CC: Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
	"davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, dl-linux-imx <linux-imx@....com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Thomas Petazzoni
	<thomas.petazzoni@...tlin.com>, Alexandre Belloni
	<alexandre.belloni@...tlin.com>, Maxime Chevallier
	<maxime.chevallier@...tlin.com>, Andrew Lunn <andrew@...n.ch>, Stephen
 Hemminger <stephen@...workplumber.org>
Subject: RE: Ethernet issue on imx6

> -----Original Message-----
> From: Miquel Raynal <miquel.raynal@...tlin.com>
> Sent: 2023年10月13日 16:40
> To: Russell King (Oracle) <linux@...linux.org.uk>
> Cc: Wei Fang <wei.fang@....com>; Shenwei Wang
> <shenwei.wang@....com>; Clark Wang <xiaoning.wang@....com>;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; dl-linux-imx <linux-imx@....com>;
> netdev@...r.kernel.org; Thomas Petazzoni
> <thomas.petazzoni@...tlin.com>; Alexandre Belloni
> <alexandre.belloni@...tlin.com>; Maxime Chevallier
> <maxime.chevallier@...tlin.com>; Andrew Lunn <andrew@...n.ch>;
> Stephen Hemminger <stephen@...workplumber.org>
> Subject: Re: Ethernet issue on imx6
> 
> Hi Russell,
> 
> linux@...linux.org.uk wrote on Thu, 12 Oct 2023 20:39:11 +0100:
> 
> > On Thu, Oct 12, 2023 at 07:34:10PM +0200, Miquel Raynal wrote:
> > > Hello,
> > >
> > > I've been scratching my foreheads for weeks on a strange imx6
> > > network issue, I need help to go further, as I feel a bit clueless now.
> > >
> > > Here is my setup :
> > > - Custom imx6q board
> > > - Bootloader: U-Boot 2017.11 (also tried with a 2016.03)
> > > - Kernel : 4.14(.69,.146,.322), v5.10 and v6.5 with the same behavior
> > > - The MAC (fec driver) is connected to a Micrel 9031 PHY
> > > - The PHY is connected to the link partner through an industrial cable
> >
> > "industrial cable" ?
> 
> It is a "unique" hardware cable, the four Ethernet pairs are foiled
> twisted pair each and the whole cable is shielded. Additionally there
> is the 24V power supply coming from this cable. The connector is from
> ODU S22LOC-P16MCD0-920S. The structure of the cable should be similar
> to a CAT7 cable with the additional power supply line.
> 
Is it necessary to use this 'industrial cable'? Can it be replaced with CAT5 or
CAT6 cable?

I also cannot reproduce this issue with my i.MX6UL and i.MX8ULP boards.
root@...6ul7d:~# iperf3 -c 10.193.108.176 -u -b80M
Connecting to host 10.193.108.176, port 5201
[  5] local 10.193.102.126 port 46382 connected to 10.193.108.176 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.00   sec  9.53 MBytes  80.0 Mbits/sec  6903
[  5]   1.00-2.00   sec  9.54 MBytes  80.0 Mbits/sec  6909
[  5]   2.00-3.00   sec  9.54 MBytes  80.0 Mbits/sec  6906
[  5]   3.00-4.00   sec  9.54 MBytes  80.0 Mbits/sec  6906
[  5]   4.00-5.00   sec  9.54 MBytes  80.0 Mbits/sec  6905
[  5]   5.00-6.00   sec  9.54 MBytes  80.0 Mbits/sec  6907
[  5]   6.00-7.00   sec  9.54 MBytes  80.0 Mbits/sec  6906
[  5]   7.00-8.00   sec  9.53 MBytes  79.9 Mbits/sec  6901
[  5]   8.00-9.00   sec  9.54 MBytes  80.1 Mbits/sec  6911
[  5]   9.00-10.00  sec  9.53 MBytes  80.0 Mbits/sec  6903
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-10.00  sec  95.4 MBytes  80.0 Mbits/sec  0.000 ms  0/69057 (0%)  sender
[  5]   0.00-10.04  sec  95.4 MBytes  79.6 Mbits/sec  0.046 ms  0/69057 (0%)  receiver