enic: feature add: add ethtool -c/C support

Only rx_usec and tx_usec options for ethtool -C are settable as those
are the only settings that make sense to HW.  Adds driver reporting of
intr coalescing timer value in usec units rather than HW units.

Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 62 insertions, 1 deletions

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 019b1480cc0c..e56f41672b37 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -261,6 +261,62 @@ static void enic_set_msglevel(struct net_device *netdev, u32 value)
         enic->msg_enable = value;
 }
 
+static int enic_get_coalesce(struct net_device *netdev,
+        struct ethtool_coalesce *ecmd)
+{
+        struct enic *enic = netdev_priv(netdev);
+
+        ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
+        ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
+
+        return 0;
+}
+
+static int enic_set_coalesce(struct net_device *netdev,
+        struct ethtool_coalesce *ecmd)
+{
+        struct enic *enic = netdev_priv(netdev);
+        u32 tx_coalesce_usecs;
+        u32 rx_coalesce_usecs;
+
+        tx_coalesce_usecs = min_t(u32,
+                INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
+                ecmd->tx_coalesce_usecs);
+        rx_coalesce_usecs = min_t(u32,
+                INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
+                ecmd->rx_coalesce_usecs);
+
+        switch (vnic_dev_get_intr_mode(enic->vdev)) {
+        case VNIC_DEV_INTR_MODE_INTX:
+                if (tx_coalesce_usecs != rx_coalesce_usecs)
+                        return -EINVAL;
+
+                vnic_intr_coalescing_timer_set(&enic->intr[ENIC_INTX_WQ_RQ],
+                        INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
+                break;
+        case VNIC_DEV_INTR_MODE_MSI:
+                if (tx_coalesce_usecs != rx_coalesce_usecs)
+                        return -EINVAL;
+
+                vnic_intr_coalescing_timer_set(&enic->intr[0],
+                        INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
+                break;
+        case VNIC_DEV_INTR_MODE_MSIX:
+                vnic_intr_coalescing_timer_set(&enic->intr[ENIC_MSIX_WQ],
+                        INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
+                vnic_intr_coalescing_timer_set(&enic->intr[ENIC_MSIX_RQ],
+                        INTR_COALESCE_USEC_TO_HW(rx_coalesce_usecs));
+                break;
+        default:
+                break;
+        }
+
+        enic->tx_coalesce_usecs = tx_coalesce_usecs;
+        enic->rx_coalesce_usecs = rx_coalesce_usecs;
+
+        return 0;
+}
+
 static const struct ethtool_ops enic_ethtool_ops = {
         .get_settings = enic_get_settings,
         .get_drvinfo = enic_get_drvinfo,
@@ -278,6 +334,8 @@ static const struct ethtool_ops enic_ethtool_ops = {
         .set_sg = ethtool_op_set_sg,
         .get_tso = ethtool_op_get_tso,
         .set_tso = enic_set_tso,
+        .get_coalesce = enic_get_coalesce,
+        .set_coalesce = enic_set_coalesce,
         .get_flags = ethtool_op_get_flags,
         .set_flags = ethtool_op_set_flags,
 };
@@ -363,12 +421,12 @@ static void enic_mtu_check(struct enic *enic)
         u32 mtu = vnic_dev_mtu(enic->vdev);
 
         if (mtu && mtu != enic->port_mtu) {
+                enic->port_mtu = mtu;
                 if (mtu < enic->netdev->mtu)
                         printk(KERN_WARNING PFX
                                 "%s: interface MTU (%d) set higher "
                                 "than switch port MTU (%d)\n",
                                 enic->netdev->name, enic->netdev->mtu, mtu);
-                enic->port_mtu = mtu;
         }
 }
 
@@ -1990,6 +2048,9 @@ static int __devinit enic_probe(struct pci_dev *pdev,
                 goto err_out_dev_deinit;
         }
 
+        enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
+        enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
+
         netdev->netdev_ops = &enic_netdev_ops;
         netdev->watchdog_timeo = 2 * HZ;
         netdev->ethtool_ops = &enic_ethtool_ops;