From: Andrew Lunn <andrew@lunn.ch>
To: Shannon Nelson <snelson@pensando.io>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH v3 net-next 13/19] ionic: Add initial ethtool support
Date: Thu, 18 Jul 2019 05:28:14 +0200 [thread overview]
Message-ID: <20190718032814.GH6962@lunn.ch> (raw)
In-Reply-To: <10c66ecf-6d67-d206-b496-6f8139f218a8@pensando.io>
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.
Andrew
next prev parent reply other threads:[~2019-07-18 3:28 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 [this message]
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
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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