s390/qeth: allow configuration of TX queues for z/VM NICs

Add support for ETHTOOL_SCHANNELS to change the count of active
TX queues.

Since all TX queue structs are pre-allocated and -registered, we just
need to trivially adjust dev->real_num_tx_queues.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index 9052c72..19b9c83 100644 (file)
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -175,6 +175,22 @@ static void qeth_get_channels(struct net_device *dev,
        channels->combined_count = 0;
 }
 
+static int qeth_set_channels(struct net_device *dev,
+                            struct ethtool_channels *channels)
+{
+       struct qeth_card *card = dev->ml_priv;
+
+       if (IS_IQD(card) || !IS_VM_NIC(card))
+               return -EOPNOTSUPP;
+
+       if (channels->rx_count == 0 || channels->tx_count == 0)
+               return -EINVAL;
+       if (channels->tx_count > card->qdio.no_out_queues)
+               return -EINVAL;
+
+       return netif_set_real_num_tx_queues(dev, channels->tx_count);
+}
+
 static int qeth_get_tunable(struct net_device *dev,
                            const struct ethtool_tunable *tuna, void *data)
 {
@@ -410,6 +426,7 @@ const struct ethtool_ops qeth_ethtool_ops = {
        .get_sset_count = qeth_get_sset_count,
        .get_drvinfo = qeth_get_drvinfo,
        .get_channels = qeth_get_channels,
+       .set_channels = qeth_set_channels,
        .get_tunable = qeth_get_tunable,
        .set_tunable = qeth_set_tunable,
        .get_link_ksettings = qeth_get_link_ksettings,