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

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Date:   Tue, 12 Oct 2021 21:03:03 +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 8:52 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?

MBR, Sergey