igc: Expose tx-usecs coalesce setting to user

When users attempt to obtain the coalesce setting using the
ethtool command, current code always returns 0 for tx-usecs.
This is because I225/6 always uses a queue pair setting, hence
tx_coalesce_usecs does not return a value during the
igc_ethtool_get_coalesce() callback process. The pair queue
condition checking in igc_ethtool_get_coalesce() is removed by
this patch so that the user gets information of the value of tx-usecs.

Even if i225/6 is using queue pair setting, there is no harm in
notifying the user of the tx-usecs. The implementation of the current
code may have previously been a copy of the legacy code i210.
Since I225 has the queue pair setting enabled, tx-usecs will always adhere
to the user-set rx-usecs value. An error message will appear when the user
attempts to set the tx-usecs value for the input parameters because,
by default, they should only set the rx-usecs value.

This patch also adds the helper function to get the
previous rx coalesce value similar to tx coalesce.

How to test:
User can get the coalesce value using ethtool command.

Example command:
Get: ethtool -c <interface>

Previous output:

rx-usecs: 3
rx-frames: n/a
rx-usecs-irq: n/a
rx-frames-irq: n/a

tx-usecs: 0
tx-frames: n/a
tx-usecs-irq: n/a
tx-frames-irq: n/a

New output:

rx-usecs: 3
rx-frames: n/a
rx-usecs-irq: n/a
rx-frames-irq: n/a

tx-usecs: 3
tx-frames: n/a
tx-usecs-irq: n/a
tx-frames-irq: n/a

Fixes: 8c5ad0dae93c ("igc: Add ethtool support")
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20230919170331.1581031-1-anthony.l.nguyen@intel.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 93bce72..7ab6dd5 100644 (file)
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -868,6 +868,18 @@ static void igc_ethtool_get_stats(struct net_device *netdev,
        spin_unlock(&adapter->stats64_lock);
 }
 
+static int igc_ethtool_get_previous_rx_coalesce(struct igc_adapter *adapter)
+{
+       return (adapter->rx_itr_setting <= 3) ?
+               adapter->rx_itr_setting : adapter->rx_itr_setting >> 2;
+}
+
+static int igc_ethtool_get_previous_tx_coalesce(struct igc_adapter *adapter)
+{
+       return (adapter->tx_itr_setting <= 3) ?
+               adapter->tx_itr_setting : adapter->tx_itr_setting >> 2;
+}
+
 static int igc_ethtool_get_coalesce(struct net_device *netdev,
                                    struct ethtool_coalesce *ec,
                                    struct kernel_ethtool_coalesce *kernel_coal,
@@ -875,17 +887,8 @@ static int igc_ethtool_get_coalesce(struct net_device *netdev,
 {
        struct igc_adapter *adapter = netdev_priv(netdev);
 
-       if (adapter->rx_itr_setting <= 3)
-               ec->rx_coalesce_usecs = adapter->rx_itr_setting;
-       else
-               ec->rx_coalesce_usecs = adapter->rx_itr_setting >> 2;
-
-       if (!(adapter->flags & IGC_FLAG_QUEUE_PAIRS)) {
-               if (adapter->tx_itr_setting <= 3)
-                       ec->tx_coalesce_usecs = adapter->tx_itr_setting;
-               else
-                       ec->tx_coalesce_usecs = adapter->tx_itr_setting >> 2;
-       }
+       ec->rx_coalesce_usecs = igc_ethtool_get_previous_rx_coalesce(adapter);
+       ec->tx_coalesce_usecs = igc_ethtool_get_previous_tx_coalesce(adapter);
 
        return 0;
 }
@@ -910,8 +913,12 @@ static int igc_ethtool_set_coalesce(struct net_device *netdev,
            ec->tx_coalesce_usecs == 2)
                return -EINVAL;
 
-       if ((adapter->flags & IGC_FLAG_QUEUE_PAIRS) && ec->tx_coalesce_usecs)
+       if ((adapter->flags & IGC_FLAG_QUEUE_PAIRS) &&
+           ec->tx_coalesce_usecs != igc_ethtool_get_previous_tx_coalesce(adapter)) {
+               NL_SET_ERR_MSG_MOD(extack,
+                                  "Queue Pair mode enabled, both Rx and Tx coalescing controlled by rx-usecs");
                return -EINVAL;
+       }
 
        /* If ITR is disabled, disable DMAC */
        if (ec->rx_coalesce_usecs == 0) {