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Message-ID: <4588d437-6308-0b6c-50e9-964a877b833f@pensando.io>
Date: Fri, 21 Jun 2019 15:30:20 -0700
From: Shannon Nelson <snelson@...sando.io>
To: Michal Kubecek <mkubecek@...e.cz>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 13/18] ionic: Add initial ethtool support
On 6/20/19 7:32 PM, Michal Kubecek wrote:
> On Thu, Jun 20, 2019 at 01:24:19PM -0700, Shannon Nelson wrote:
>> Add in the basic ethtool callbacks for device information
>> and control.
>>
>> Signed-off-by: Shannon Nelson <snelson@...sando.io>
>> ---
> ...
>> +static int ionic_get_link_ksettings(struct net_device *netdev,
>> + struct ethtool_link_ksettings *ks)
>> +{
>> + struct lif *lif = netdev_priv(netdev);
>> + struct ionic_dev *idev = &lif->ionic->idev;
>> + int copper_seen = 0;
>> +
>> + ethtool_link_ksettings_zero_link_mode(ks, supported);
>> + ethtool_link_ksettings_zero_link_mode(ks, advertising);
>> +
>> + if (ionic_is_mnic(lif->ionic)) {
>> + ethtool_link_ksettings_add_link_mode(ks, supported, Backplane);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, Backplane);
>> + } else {
>> + ethtool_link_ksettings_add_link_mode(ks, supported, FIBRE);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, FIBRE);
>> +
>> + if (ionic_is_pf(lif->ionic)) {
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + Autoneg);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + Autoneg);
>> + }
>> + }
>> +
>> + switch (le16_to_cpu(idev->port_info->status.xcvr.pid)) {
>> + /* Copper */
>> + case XCVR_PID_QSFP_100G_CR4:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 100000baseCR4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 100000baseCR4_Full);
>> + copper_seen++;
>> + break;
>> + case XCVR_PID_QSFP_40GBASE_CR4:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 40000baseCR4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 40000baseCR4_Full);
>> + copper_seen++;
>> + break;
>> + case XCVR_PID_SFP_25GBASE_CR_S:
>> + case XCVR_PID_SFP_25GBASE_CR_L:
>> + case XCVR_PID_SFP_25GBASE_CR_N:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 25000baseCR_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 25000baseCR_Full);
>> + copper_seen++;
>> + break;
>> + case XCVR_PID_SFP_10GBASE_AOC:
>> + case XCVR_PID_SFP_10GBASE_CU:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 10000baseCR_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 10000baseCR_Full);
>> + copper_seen++;
>> + break;
>> +
>> + /* Fibre */
>> + case XCVR_PID_QSFP_100G_SR4:
>> + case XCVR_PID_QSFP_100G_AOC:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 100000baseSR4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 100000baseSR4_Full);
>> + break;
>> + case XCVR_PID_QSFP_100G_LR4:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 100000baseLR4_ER4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 100000baseLR4_ER4_Full);
>> + break;
>> + case XCVR_PID_QSFP_100G_ER4:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 100000baseLR4_ER4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 100000baseLR4_ER4_Full);
>> + break;
>> + case XCVR_PID_QSFP_40GBASE_SR4:
>> + case XCVR_PID_QSFP_40GBASE_AOC:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 40000baseSR4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 40000baseSR4_Full);
>> + break;
>> + case XCVR_PID_QSFP_40GBASE_LR4:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 40000baseLR4_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 40000baseLR4_Full);
>> + break;
>> + case XCVR_PID_SFP_25GBASE_SR:
>> + case XCVR_PID_SFP_25GBASE_AOC:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 25000baseSR_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 25000baseSR_Full);
>> + break;
>> + case XCVR_PID_SFP_10GBASE_SR:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 10000baseSR_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 10000baseSR_Full);
>> + break;
>> + case XCVR_PID_SFP_10GBASE_LR:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 10000baseLR_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 10000baseLR_Full);
>> + break;
>> + case XCVR_PID_SFP_10GBASE_LRM:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 10000baseLRM_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 10000baseLRM_Full);
>> + break;
>> + case XCVR_PID_SFP_10GBASE_ER:
>> + ethtool_link_ksettings_add_link_mode(ks, supported,
>> + 10000baseER_Full);
>> + ethtool_link_ksettings_add_link_mode(ks, advertising,
>> + 10000baseER_Full);
>> + break;
>> + case XCVR_PID_QSFP_100G_ACC:
>> + case XCVR_PID_QSFP_40GBASE_ER4:
>> + case XCVR_PID_SFP_25GBASE_LR:
>> + case XCVR_PID_SFP_25GBASE_ER:
>> + dev_info(lif->ionic->dev, "no decode bits for xcvr type pid=%d / 0x%x\n",
>> + idev->port_info->status.xcvr.pid,
>> + idev->port_info->status.xcvr.pid);
>> + break;
> Maybe you should rather add these modes so that they can be shown and
> set.
Yeah, I was thinking about that. I'll look at adding them in a separate
patchset.
>
>> + case XCVR_PID_UNKNOWN:
>> + break;
>> + default:
>> + dev_info(lif->ionic->dev, "unknown xcvr type pid=%d / 0x%x\n",
>> + idev->port_info->status.xcvr.pid,
>> + idev->port_info->status.xcvr.pid);
>> + break;
>> + }
> Up to this point, you always set each bit in both supported and
> advertised modes. Thus you could set the modes in only one of the
> bitmaps and copy it to the other here.
Good idea - that would clean up some of this silliness.
>
>> +
>> + ethtool_link_ksettings_add_link_mode(ks, supported, Pause);
>> + if (idev->port_info->config.pause_type)
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, Pause);
>> +
>> + if (idev->port_info->config.fec_type == PORT_FEC_TYPE_FC)
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, FEC_BASER);
>> + else if (idev->port_info->config.fec_type == PORT_FEC_TYPE_RS)
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, FEC_RS);
>> + else
>> + ethtool_link_ksettings_add_link_mode(ks, advertising, FEC_NONE);
> Is it correct to set these FEC bits only in advertising and not in
> supported?
Hmmm... good catch.
>
>> +static int ionic_set_link_ksettings(struct net_device *netdev,
>> + const struct ethtool_link_ksettings *ks)
>> +{
>> + struct lif *lif = netdev_priv(netdev);
>> + struct ionic *ionic = lif->ionic;
>> + struct ionic_dev *idev = &lif->ionic->idev;
>> + u8 fec_type = PORT_FEC_TYPE_NONE;
>> + u32 req_rs, req_b;
>> + int err = 0;
>> +
>> + /* set autoneg */
>> + if (ks->base.autoneg != idev->port_info->config.an_enable) {
>> + idev->port_info->config.an_enable = ks->base.autoneg;
> IMHO you should only save the value if the command below succeeds,
> otherwise next time you will be comparing against the value which wasn't
> actually set.
Yes, thanks.
>
>> + mutex_lock(&ionic->dev_cmd_lock);
>> + ionic_dev_cmd_port_autoneg(idev, ks->base.autoneg);
>> + err = ionic_dev_cmd_wait(ionic, devcmd_timeout);
>> + mutex_unlock(&ionic->dev_cmd_lock);
>> + if (err)
>> + return err;
>> + }
>> +
>> + /* set speed */
>> + if (ks->base.speed != le32_to_cpu(idev->port_info->config.speed)) {
>> + idev->port_info->config.speed = cpu_to_le32(ks->base.speed);
> Same here.
Sure.
>
>> + mutex_lock(&ionic->dev_cmd_lock);
>> + ionic_dev_cmd_port_speed(idev, ks->base.speed);
>> + err = ionic_dev_cmd_wait(ionic, devcmd_timeout);
>> + mutex_unlock(&ionic->dev_cmd_lock);
>> + if (err)
>> + return err;
>> + }
>> +
>> + /* set FEC */
>> + req_rs = ethtool_link_ksettings_test_link_mode(ks, advertising, FEC_RS);
>> + req_b = ethtool_link_ksettings_test_link_mode(ks, advertising, FEC_BASER);
>> + if (req_rs && req_b) {
>> + netdev_info(netdev, "Only select one FEC mode at a time\n");
>> + return -EINVAL;
>> +
>> + } else if (req_b &&
>> + idev->port_info->config.fec_type != PORT_FEC_TYPE_FC) {
>> + fec_type = PORT_FEC_TYPE_FC;
>> + } else if (req_rs &&
>> + idev->port_info->config.fec_type != PORT_FEC_TYPE_RS) {
>> + fec_type = PORT_FEC_TYPE_RS;
>> + } else if (!(req_rs | req_b) &&
>> + idev->port_info->config.fec_type != PORT_FEC_TYPE_NONE) {
>> + fec_type = PORT_FEC_TYPE_NONE;
>> + }
> AFAICS if userspace requests a mode which is already set, you end up
> with fec_type = PORT_FEC_TYPE_NONE here. This doesn't seem right.
> I assume you would rather want to skip the setting below in such case.
I'll double check that - thanks.
>
>> +
>> + idev->port_info->config.fec_type = fec_type;
>> + mutex_lock(&ionic->dev_cmd_lock);
>> + ionic_dev_cmd_port_fec(idev, PORT_FEC_TYPE_NONE);
> Shouldn't the argument be fec_type here?
Ugh... yes.
>
>> + err = ionic_dev_cmd_wait(ionic, devcmd_timeout);
>> + mutex_unlock(&ionic->dev_cmd_lock);
>> + if (err)
>> + return err;
>> +
>> + return 0;
>> +}
> ...
>> +static int ionic_set_ringparam(struct net_device *netdev,
>> + struct ethtool_ringparam *ring)
>> +{
>> + struct lif *lif = netdev_priv(netdev);
>> + bool running;
>> + int i, j;
>> +
>> + if (ring->rx_mini_pending || ring->rx_jumbo_pending) {
>> + netdev_info(netdev, "Changing jumbo or mini descriptors not supported\n");
>> + return -EINVAL;
>> + }
>> +
>> + i = ring->tx_pending & (ring->tx_pending - 1);
>> + j = ring->rx_pending & (ring->rx_pending - 1);
>> + if (i || j) {
>> + netdev_info(netdev, "Descriptor count must be a power of 2\n");
>> + return -EINVAL;
>> + }
>> +
>> + if (ring->tx_pending > IONIC_MAX_TXRX_DESC ||
>> + ring->tx_pending < IONIC_MIN_TXRX_DESC ||
>> + ring->rx_pending > IONIC_MAX_TXRX_DESC ||
>> + ring->rx_pending < IONIC_MIN_TXRX_DESC) {
>> + netdev_info(netdev, "Descriptors count must be in the range [%d-%d]\n",
>> + IONIC_MIN_TXRX_DESC, IONIC_MAX_TXRX_DESC);
>> + return -EINVAL;
>> + }
> The upper bounds have been already checked in ethtool_set_ringparam() so
> that the two conditions can never be satisfied here.
>
> ...
>> +static int ionic_set_channels(struct net_device *netdev,
>> + struct ethtool_channels *ch)
>> +{
>> + struct lif *lif = netdev_priv(netdev);
>> + bool running;
>> +
>> + if (!ch->combined_count || ch->other_count ||
>> + ch->rx_count || ch->tx_count)
>> + return -EINVAL;
>> +
>> + if (ch->combined_count > lif->ionic->ntxqs_per_lif)
>> + return -EINVAL;
> This has been already checked in ethtool_set_channels().
That's what I get for copying from an existing driver. I'll check those
and clean them up.
>
> Michal Kubecek
Thanks!
sln
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