ionic: add support for ethtool extended stat link_down_count

Following the example of 'commit 9a0f830f8026 ("ethtool: linkstate:
add a statistic for PHY down events")', added support for link down
events.

Add callback ionic_get_link_ext_stats to ionic_ethtool.c to support
link_down_count, a property of netdev that gets reported exclusively
on physical link down events.

Run ethtool -I <devname> to display the device link down count.

Signed-off-by: Nitya Sunkad <nitya.sunkad@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index 9b2b96f..3a6b0a9 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -104,6 +104,15 @@ static void ionic_get_regs(struct net_device *netdev, struct ethtool_regs *regs,
        memcpy_fromio(p + offset, lif->ionic->idev.dev_cmd_regs->words, size);
 }
 
+static void ionic_get_link_ext_stats(struct net_device *netdev,
+                                    struct ethtool_link_ext_stats *stats)
+{
+       struct ionic_lif *lif = netdev_priv(netdev);
+
+       if (lif->ionic->pdev->is_physfn)
+               stats->link_down_events = lif->link_down_count;
+}
+
 static int ionic_get_link_ksettings(struct net_device *netdev,
                                    struct ethtool_link_ksettings *ks)
 {
@@ -1074,6 +1083,7 @@ static const struct ethtool_ops ionic_ethtool_ops = {
        .get_regs_len           = ionic_get_regs_len,
        .get_regs               = ionic_get_regs,
        .get_link               = ethtool_op_get_link,
+       .get_link_ext_stats     = ionic_get_link_ext_stats,
        .get_link_ksettings     = ionic_get_link_ksettings,
        .set_link_ksettings     = ionic_set_link_ksettings,
        .get_coalesce           = ionic_get_coalesce,

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 957027e..6ccc1ea 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -168,6 +168,7 @@ static void ionic_link_status_check(struct ionic_lif *lif)
                }
        } else {
                if (netif_carrier_ok(netdev)) {
+                       lif->link_down_count++;
                        netdev_info(netdev, "Link down\n");
                        netif_carrier_off(netdev);
                }

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index c9c4c46..fd2ea67 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -201,6 +201,7 @@ struct ionic_lif {
        u64 hw_features;
        bool registered;
        u16 lif_type;
+       unsigned int link_down_count;
        unsigned int nmcast;
        unsigned int nucast;
        unsigned int nvlans;