netdev - Re: [PATCH net-next v3 13/14] ravb: Update ravb_emac_init

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Date:   Tue, 12 Oct 2021 21:25:44 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next v3 13/14] ravb: Update ravb_emac_init_gbeth()

On 10/12/21 9:23 PM, Biju Das wrote:

>>>>> This patch enables Receive/Transmit port of TOE and removes the
>>>>> setting of promiscuous bit from EMAC configuration mode register.
>>>>>
>>>>> This patch also update EMAC configuration mode comment from "PAUSE
>>>>> prohibition" to "EMAC Mode: PAUSE prohibition; Duplex; TX; RX; CRC
>>>>> Pass Through".
>>>>
>>>>    I'm not sure why you set ECMR.RCPT while you don't have the
>>>> checksum offloaded...
>>>>
>>>>> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
>>>>> ---
>>>>> v2->v3:
>>>>>  * Enabled TPE/RPE of TOE, as disabling causes loopback test to fail
>>>>>  * Documented CSR0 register bits
>>>>>  * Removed PRM setting from EMAC configuration mode
>>>>>  * Updated EMAC configuration mode.
>>>>> v1->v2:
>>>>>  * No change
>>>>> V1:
>>>>>  * New patch.
>>>>> ---
>>>>>  drivers/net/ethernet/renesas/ravb.h      | 6 ++++++
>>>>>  drivers/net/ethernet/renesas/ravb_main.c | 5 +++--
>>>>>  2 files changed, 9 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/renesas/ravb.h
>>>>> b/drivers/net/ethernet/renesas/ravb.h
>>>>> index 69a771526776..08062d73df10 100644
>>>>> --- a/drivers/net/ethernet/renesas/ravb.h
>>>>> +++ b/drivers/net/ethernet/renesas/ravb.h
>>>>> @@ -204,6 +204,7 @@ enum ravb_reg {
>>>>>  	TLFRCR	= 0x0758,
>>>>>  	RFCR	= 0x0760,
>>>>>  	MAFCR	= 0x0778,
>>>>> +	CSR0    = 0x0800,	/* RZ/G2L only */
>>>>>  };
>>>>>
>>>>>
>>>>> @@ -964,6 +965,11 @@ enum CXR31_BIT {
>>>>>  	CXR31_SEL_LINK1	= 0x00000008,
>>>>>  };
>>>>>
>>>>> +enum CSR0_BIT {
>>>>> +	CSR0_TPE	= 0x00000010,
>>>>> +	CSR0_RPE	= 0x00000020,
>>>>> +};
>>>>> +
>>>>
>>>>   Is this really needed if you have ECMR.RCPT cleared?
>>>
>>> Yes it is required. Please see the current log and log with the
>>> changes you suggested
>>>
>>> root@...rc-rzg2l:/rzg2l-test-scripts# ./eth_t_001.sh
>>> [   39.646891] ravb 11c20000.ethernet eth0: Link is Down
>>> [   39.715127] ravb 11c30000.ethernet eth1: Link is Down
>>> [   39.895680] Microchip KSZ9131 Gigabit PHY 11c20000.ethernet-
>> ffffffff:07: attached PHY driver (mii_bus:phy_addr=11c20000.ethernet-
>> ffffffff:07, irq=POLL)
>>> [   39.966370] Microchip KSZ9131 Gigabit PHY 11c30000.ethernet-
>> ffffffff:07: attached PHY driver (mii_bus:phy_addr=11c30000.ethernet-
>> ffffffff:07, irq=POLL)
>>> [   42.988573] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
>>> [   42.995119] ravb 11c20000.ethernet eth0: Link is Up - 1Gbps/Full -
>> flow control off
>>> [   43.052541] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
>>> [   43.055710] ravb 11c30000.ethernet eth1: Link is Up - 1Gbps/Full -
>> flow control off
>>>
>>> EXIT|PASS||[422391:43:00] ||
>>>
>>> root@...rc-rzg2l:/rzg2l-test-scripts#
>>>
>>>
>>> with the changes you suggested
>>> ----------------------------
>>>
>>> root@...rc-rzg2l:/rzg2l-test-scripts# ./eth_t_001.sh
>>> [   23.300520] ravb 11c20000.ethernet eth0: Link is Down
>>> [   23.535604] ravb 11c30000.ethernet eth1: device will be stopped after
>> h/w processes are done.
>>> [   23.547267] ravb 11c30000.ethernet eth1: Link is Down
>>> [   23.802667] Microchip KSZ9131 Gigabit PHY 11c20000.ethernet-
>> ffffffff:07: attached PHY driver (mii_bus:phy_addr=11c20000.ethernet-
>> ffffffff:07, irq=POLL)
>>> [   24.031711] ravb 11c30000.ethernet eth1: failed to switch device to
>> config mode
>>> RTNETLINK answers: Connection timed out
>>>
>>> EXIT|FAIL||[422391:42:32] Failed to bring up ETH1||
>>>
>>> root@...rc-rzg2l:/rzg2l-test-scripts#
>>
>>    Hm... :-/
>>    What if you only clear ECMR.RCPT but continue to set CSR0?
> 
> We already seen, RCPT=0, RCSC=1 with similar Hardware checksum function like R-Car,
> System crashes.

   I didn't tell you to set ECMR.RCSC this time. :-)

> Regards,
> Biju

MBR, Sergey