linux-kernel - [Aspeed,ncsi-rx, v1 0/1] net: ftgmac100: Fix AST2600EVB NCSI RX issue

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Date:   Mon, 11 Jan 2021 15:58:59 -0500
From:   Hongwei Zhang <hongweiz@....com>
To:     Dylan Hung <dylan_hung@...eedtech.com>,
        Joel Stanley <joel@....id.au>, <linux-aspeed@...ts.ozlabs.org>,
        <linux-kernel@...r.kernel.org>, <openbmc@...ts.ozlabs.org>,
        Jakub Kicinski <kuba@...nel.org>,
        David S Miller <davem@...emloft.net>
CC:     Hongwei Zhang <hongweiz@....com>, netdev <netdev@...r.kernel.org>,
        Andrew Jeffery <andrew@...id.au>
Subject: [Aspeed,ncsi-rx, v1 0/1] net: ftgmac100: Fix AST2600EVB NCSI RX issue

> 
> Hi Hongwei,
> 
> The NCSI should run on 3.3V RMII.  According your log, you enabled NCSI on 
> ftgmac100@...60000 which can only support 1.8V I/O voltage.
> Did you observe the same error on ftgmac100@...70000 (MAC3) or ftgmac100@...90000 (MAC4)?
> 

Hi Dylan,

Thanks for your review and input, you're correct, this issue is not observed on
AST2600 MAC4 (ftgmac100@...90000).

Though this issue is caused by using NCSI incompatible MAC ftgmac100@...60000,
we thought this patch is still having value, by providing an extra option to
user to be able to use ftgmac100@...60000 for NCSI, and this is also true for
AST2500.

--Hongwei
 
> > -----Original Message-----
> > From: Linux-aspeed
> > [mailto:linux-aspeed-bounces+dylan_hung=aspeedtech.com@...ts.ozlabs.or
> > g]
> > On Behalf Of Joel Stanley
> > Sent: 2020?12?22? 10:26 AM
> > To: Hongwei Zhang <hongweiz@....com>; Ryan Chen 
> > <ryan_chen@...eedtech.com>
> > Cc: linux-aspeed <linux-aspeed@...ts.ozlabs.org>; netdev 
> > <netdev@...r.kernel.org>; OpenBMC Maillist <openbmc@...ts.ozlabs.org>; 
> > Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; Jakub 
> > Kicinski <kuba@...nel.org>; David S Miller <davem@...emloft.net>
> > Subject: Re: [Aspeed, ncsi-rx, v1 0/1] net: ftgmac100: Fix AST2600EVB 
> > NCSI RX issue
> > 
> > On Mon, 21 Dec 2020 at 17:01, Hongwei Zhang <hongweiz@....com> wrote:
> > >
> > > Dear Reviewer,
> > >
> > > When FTGMAC100 driver is used on other NCSI Ethernet controllers, 
> > > few controllers have compatible issue. One example is Intel I210 
> > > Ethernet controller on AST2600 BMC, with FTGMAC100 driver, it always 
> > > trigger RXDES0_RX_ERR error, cause NCSI initialization failure, 
> > > removing FTGMAC100_RXDES0_RX_ERR bit from RXDES0_ANY_ERROR fix the issue.
> > 
> > I work with a few systems that use the i210 on the 2600. We haven't 
> > seen this issue in our testing.
> > 
> > Is there something specific about the setup that you use to trigger this?
> > 
> > Ryan, is this an issue that Aspeed is aware of?
> > 
> > Cheers,
> > 
> > Joel

Hello Joel,

Thanks for your review, please see my response to Dylan, he pointed out
the root cause of the issue.

-- Hongwei

> > 
> > >
> > > Here are part of the debug logs:
> > > ......
> > > [   35.075552] ftgmac100_hard_start_xmit TXDESO=b000003c
> > > [   35.080843] ftgmac100 1e660000.ethernet eth0: tx_complete_packet 55
> > > [   35.087141] ftgmac100 1e660000.ethernet eth0: rx_packet_error
> > RXDES0=0xb0070040
> > > [   37.067831] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
> > > ............
> > >
> > > This patch add a configurable flag, FTGMAC100_RXDES0_RX_ERR_CHK, in
> > > FTGMAC100  driver, it is YES by default, so keep the orignal define 
> > > of RXDES0_ANY_ERROR. If it is needed, user can set the flag to NO to 
> > > remove the RXDES0_RX_ERR bit, to fix the issue.
> > >
> > > Hongwei Zhang (1):
> > >   net: ftgmac100: Fix AST2600 EVB NCSI RX issue
> > >
> > >  drivers/net/ethernet/faraday/Kconfig     | 9 +++++++++
> > >  drivers/net/ethernet/faraday/ftgmac100.h | 8 ++++++++
> > >  2 files changed, 17 insertions(+)
> > >
> > > --
> > > 2.17.1
> > >
>