From: Shannon Nelson <snelson@pensando.io>
To: Andrew Lunn <andrew@lunn.ch>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH v3 net-next 13/19] ionic: Add initial ethtool support
Date: Fri, 19 Jul 2019 13:20:25 -0700 [thread overview]
Message-ID: <087d62dc-5a73-b924-8b03-d92fc03acd23@pensando.io> (raw)
In-Reply-To: <20190719190715.GO25635@lunn.ch>
On 7/19/19 12:07 PM, Andrew Lunn wrote:
> On Fri, Jul 19, 2019 at 11:41:28AM -0700, Shannon Nelson wrote:
>> On 7/18/19 7:40 PM, Andrew Lunn wrote:
>>> On Thu, Jul 18, 2019 at 05:12:07PM -0700, Shannon Nelson wrote:
>>>> On 7/17/19 8:28 PM, Andrew Lunn wrote:
>>>>> On Fri, Jul 12, 2019 at 10:16:31PM -0700, Shannon Nelson wrote:
>>>>>> On 7/8/19 7:14 PM, Andrew Lunn wrote:
>>>>>>>> +static int ionic_set_pauseparam(struct net_device *netdev,
>>>>>>>> + struct ethtool_pauseparam *pause)
>>>>>>>> +{
>>>>>>>> + struct lif *lif = netdev_priv(netdev);
>>>>>>>> + struct ionic *ionic = lif->ionic;
>>>>>>>> + struct ionic_dev *idev = &lif->ionic->idev;
>>>>>>>> +
>>>>>>>> + u32 requested_pause;
>>>>>>>> + u32 cur_autoneg;
>>>>>>>> + int err;
>>>>>>>> +
>>>>>>>> + cur_autoneg = idev->port_info->config.an_enable ? AUTONEG_ENABLE :
>>>>>>>> + AUTONEG_DISABLE;
>>>>>>>> + if (pause->autoneg != cur_autoneg) {
>>>>>>>> + netdev_info(netdev, "Please use 'ethtool -s ...' to change autoneg\n");
>>>>>>>> + return -EOPNOTSUPP;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + /* change both at the same time */
>>>>>>>> + requested_pause = PORT_PAUSE_TYPE_LINK;
>>>>>>>> + if (pause->rx_pause)
>>>>>>>> + requested_pause |= IONIC_PAUSE_F_RX;
>>>>>>>> + if (pause->tx_pause)
>>>>>>>> + requested_pause |= IONIC_PAUSE_F_TX;
>>>>>>>> +
>>>>>>>> + if (requested_pause == idev->port_info->config.pause_type)
>>>>>>>> + return 0;
>>>>>>>> +
>>>>>>>> + idev->port_info->config.pause_type = requested_pause;
>>>>>>>> +
>>>>>>>> + mutex_lock(&ionic->dev_cmd_lock);
>>>>>>>> + ionic_dev_cmd_port_pause(idev, requested_pause);
>>>>>>>> + err = ionic_dev_cmd_wait(ionic, devcmd_timeout);
>>>>>>>> + mutex_unlock(&ionic->dev_cmd_lock);
>>>>>>>> + if (err)
>>>>>>>> + return err;
>>>>>>> Hi Shannon
>>>>>>>
>>>>>>> I've no idea what the firmware black box is doing, but this looks
>>>>>>> wrong.
>>>>>>>
>>>>>>> pause->autoneg is about if the results of auto-neg should be used or
>>>>>>> not. If false, just configure the MAC with the pause settings and you
>>>>>>> are done. If the interface is being forced, so autoneg in general is
>>>>>>> disabled, just configure the MAC and you are done.
>>>>>>>
>>>>>>> If pause->autoneg is true and the interface is using auto-neg as a
>>>>>>> whole, you pass the pause values to the PHY for it to advertise and
>>>>>>> trigger an auto-neg. Once autoneg has completed, and the resolved
>>>>>>> settings are available, the MAC is configured with the resolved
>>>>>>> values.
>>>>>>>
>>>>>>> Looking at this code, i don't see any difference between configuring
>>>>>>> the MAC or configuring the PHY. I would expect pause->autoneg to be
>>>>>>> part of requested_pause somehow, so the firmware knows what is should
>>>>>>> do.
>>>>>>>
>>>>>>> Andrew
>>>>>> In this device there's actually very little the driver can do to directly
>>>>>> configure the mac or phy besides passing through to the firmware what the
>>>>>> user has requested - that happens here for the pause values, and in
>>>>>> ionic_set_link_ksettings() for autoneg. The firmware is managing the port
>>>>>> based on these requests with the help of internally configured rules defined
>>>>>> in a customer setting.
>>>>> I get that. But the firmware needs to conform to what Linux
>>>>> expects. And what i see here does not conform. That is why i gave a
>>>>> bit of detail in my reply.
>>>>>
>>>>> What exactly does the firmware do? Once we know that, we can figure
>>>>> out when the driver should return -EOPNOTSUPP because of firmware
>>>>> limitations, and what it can configure and should return 0.
>>>> Because this is fairly smart FW, it handles this as expected. I can add
>>>> this as another comment in the code.
>>> Hi Shannon
>>>
>>> Looking at the code, i don't see how it can handle this
>>> correctly. Please look at my comments, particularly the meaning of
>>> pause->autoneg and describe how the firmware does the right thing,
>>> given what information it is passed.
>>>
>> I guess I'm not sure how much better I can answer your question. Like
>> several other devices, we don't support selecting pause->autoneg. The
>> firmware manages the PHY itself, the driver doesn't have direct access to
>> the PHY. The driver passes the tx and rx pause info down to the firmware in
>> a command request. The NIC firmware does an autoneg if autoneg is enabled
>> on the port.
> Hi Shannon
>
> Thanks. That was the information i was looking for.
>
> Please return -EOPNOTSUPP if pause->autoneg indicates autoneg results
> should not be used. Your firmware does not support it, so the driver
> should error out. Also the get function should use a hard coded value
> for pause->autoneg.
>
> If you ever fix your firmware, you can add full support for pause
> configuration.
>
>
Thanks for the help,
sln
next prev parent reply other threads:[~2019-07-19 20:20 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 19:25 [PATCH v3 net-next 00/19] Add ionic driver Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 01/19] ionic: Add basic framework for IONIC Network device driver Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 02/19] ionic: Add hardware init and device commands Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 03/19] ionic: Add port management commands Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 04/19] ionic: Add basic lif support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 05/19] ionic: Add interrupts and doorbells Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 06/19] ionic: Add basic adminq support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 07/19] ionic: Add adminq action Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 08/19] ionic: Add notifyq support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 09/19] ionic: Add the basic NDO callbacks for netdev support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 10/19] ionic: Add management of rx filters Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 11/19] ionic: Add Rx filter and rx_mode ndo support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 12/19] ionic: Add async link status check and basic stats Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 13/19] ionic: Add initial ethtool support Shannon Nelson
2019-07-08 22:04 ` Andrew Lunn
2019-07-09 5:15 ` Michal Kubecek
2019-07-09 22:35 ` Shannon Nelson
2019-07-11 19:10 ` Shannon Nelson
2019-07-09 2:14 ` Andrew Lunn
2019-07-13 5:16 ` Shannon Nelson
2019-07-18 3:28 ` Andrew Lunn
2019-07-19 0:12 ` Shannon Nelson
2019-07-19 2:40 ` Andrew Lunn
2019-07-19 18:41 ` Shannon Nelson
2019-07-19 19:07 ` Andrew Lunn
2019-07-19 20:20 ` Shannon Nelson [this message]
2019-07-09 2:27 ` Andrew Lunn
2019-07-09 22:42 ` Shannon Nelson
2019-07-18 3:21 ` Andrew Lunn
2019-07-18 17:05 ` Shannon Nelson
2019-07-18 17:28 ` Andrew Lunn
2019-07-18 17:54 ` Shannon Nelson
2019-07-09 2:30 ` Andrew Lunn
2019-07-13 5:32 ` Shannon Nelson
2019-07-18 3:31 ` Andrew Lunn
2019-07-18 17:14 ` Shannon Nelson
2019-07-09 5:25 ` Michal Kubecek
2019-07-09 22:34 ` Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 14/19] ionic: Add Tx and Rx handling Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 15/19] ionic: Add netdev-event handling Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 16/19] ionic: Add driver stats Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 17/19] ionic: Add RSS support Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 18/19] ionic: Add coalesce and other features Shannon Nelson
2019-07-08 19:25 ` [PATCH v3 net-next 19/19] ionic: Add basic devlink interface Shannon Nelson
2019-07-08 19:34 ` Jiri Pirko
2019-07-08 19:58 ` Shannon Nelson
2019-07-08 20:03 ` Jiri Pirko
2019-07-08 22:58 ` Shannon Nelson
2019-07-09 6:56 ` Jiri Pirko
2019-07-09 19:13 ` Shannon Nelson
2019-07-10 6:48 ` Jiri Pirko
2019-07-10 17:06 ` Shannon Nelson
2019-07-09 1:26 ` Jakub Kicinski
2019-07-09 19:06 ` Shannon Nelson
2019-07-09 2:58 ` [PATCH v3 net-next 00/19] Add ionic driver David Miller
2019-07-09 3:01 ` Shannon Nelson
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