[PATCH 5/6] net: thunderx: Switchon carrier only upon interface link up

[Sunil Kovvuri]

Hi Pavel Fedin,

Are running Fedora 21 on Cavium ThunderX ?
Do you see linkup notification (dmesg) ?

If you see the existing driver (pasted snippet below), it does call
netif_carrier_on() upon receiving l
ink up notification from BGX driver.

===
case NIC_MBOX_MSG_BGX_LINK_CHANGE:
        .........
       if (nic->link_up) {
       netdev_info(nic->netdev, "%s: Link is Up %d Mbps %s\n",
                  nic->netdev->name, nic->speed,
                 nic->duplex == DUPLEX_FULL ?
                 "Full duplex" : "Half duplex");
       netif_carrier_on(nic->netdev);
       netif_tx_start_all_queues(nic->netdev);
========

This patch removes calling carrier on by default.


Thanks,
Sunil.

On Tue, Dec 1, 2015 at 9:02 PM, Pavel Fedin <p.fedin at samsung.com> wrote:
>  Hello!
>
>  This one causes the network to stop working on Fedora 21. Probably has to do with NetworkManager, which sees something unexpected.
> IP address is never set up and connection is never activated, despite it has UP flag.
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia
>
>
>> -----Original Message-----
>> From: netdev-owner at vger.kernel.org [mailto:netdev-owner at vger.kernel.org] On Behalf Of Sunil
>> Goutham
>> Sent: Tuesday, December 01, 2015 12:14 PM
>> To: netdev at vger.kernel.org
>> Cc: linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
>> Sunil.Goutham at caviumnetworks.com; Sunil Goutham
>> Subject: [PATCH 5/6] net: thunderx: Switchon carrier only upon interface link up
>>
>> From: Sunil Goutham <sgoutham at cavium.com>
>>
>> Call netif_carrier_on() only if interface's link is up. Switching this on
>> upon IFF_UP by default, is causing issues with ethernet channel bonding
>> in LACP mode. Initial NETDEV_CHANGE notification was being skipped.
>>
>> Also fixed some issues with link/speed/duplex reporting via ethtool.
>>
>> Signed-off-by: Sunil Goutham <sgoutham at cavium.com>
>> ---
>>  .../net/ethernet/cavium/thunder/nicvf_ethtool.c    |   16 +++++++++++++++-
>>  drivers/net/ethernet/cavium/thunder/nicvf_main.c   |    4 +---
>>  drivers/net/ethernet/cavium/thunder/thunder_bgx.c  |    2 ++
>>  3 files changed, 18 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
>> b/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
>> index af54c10..a12b2e3 100644
>> --- a/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
>> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
>> @@ -112,6 +112,13 @@ static int nicvf_get_settings(struct net_device *netdev,
>>
>>       cmd->supported = 0;
>>       cmd->transceiver = XCVR_EXTERNAL;
>> +
>> +     if (!nic->link_up) {
>> +             cmd->duplex = DUPLEX_UNKNOWN;
>> +             ethtool_cmd_speed_set(cmd, SPEED_UNKNOWN);
>> +             return 0;
>> +     }
>> +
>>       if (nic->speed <= 1000) {
>>               cmd->port = PORT_MII;
>>               cmd->autoneg = AUTONEG_ENABLE;
>> @@ -125,6 +132,13 @@ static int nicvf_get_settings(struct net_device *netdev,
>>       return 0;
>>  }
>>
>> +static u32 nicvf_get_link(struct net_device *netdev)
>> +{
>> +     struct nicvf *nic = netdev_priv(netdev);
>> +
>> +     return nic->link_up;
>> +}
>> +
>>  static void nicvf_get_drvinfo(struct net_device *netdev,
>>                             struct ethtool_drvinfo *info)
>>  {
>> @@ -660,7 +674,7 @@ static int nicvf_set_channels(struct net_device *dev,
>>
>>  static const struct ethtool_ops nicvf_ethtool_ops = {
>>       .get_settings           = nicvf_get_settings,
>> -     .get_link               = ethtool_op_get_link,
>> +     .get_link               = nicvf_get_link,
>>       .get_drvinfo            = nicvf_get_drvinfo,
>>       .get_msglevel           = nicvf_get_msglevel,
>>       .set_msglevel           = nicvf_set_msglevel,
>> diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
>> b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
>> index 7f709cb..dde8dc7 100644
>> --- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
>> +++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
>> @@ -1057,6 +1057,7 @@ int nicvf_stop(struct net_device *netdev)
>>
>>       netif_carrier_off(netdev);
>>       netif_tx_stop_all_queues(nic->netdev);
>> +     nic->link_up = false;
>>
>>       /* Teardown secondary qsets first */
>>       if (!nic->sqs_mode) {
>> @@ -1211,9 +1212,6 @@ int nicvf_open(struct net_device *netdev)
>>       nic->drv_stats.txq_stop = 0;
>>       nic->drv_stats.txq_wake = 0;
>>
>> -     netif_carrier_on(netdev);
>> -     netif_tx_start_all_queues(netdev);
>> -
>>       return 0;
>>  cleanup:
>>       nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0);
>> diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
>> b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
>> index 2076ac3..d9f27ad 100644
>> --- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
>> +++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
>> @@ -612,6 +612,8 @@ static void bgx_poll_for_link(struct work_struct *work)
>>               lmac->last_duplex = 1;
>>       } else {
>>               lmac->link_up = 0;
>> +             lmac->last_speed = SPEED_UNKNOWN;
>> +             lmac->last_duplex = DUPLEX_UNKNOWN;
>>       }
>>
>>       if (lmac->last_link != lmac->link_up) {
>> --
>> 1.7.1
>>
>> --
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