From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Wed, 18 Mar 2020 13:54:48 +0100
Subject: s390/qeth: allow configuration of TX queues for z/VM NICs
Git-commit: fcc2df8b8777c960c8125bc157423c76415a5419
Patch-mainline: v5.7-rc1
References: jsc#SLE-13690

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/s390/net/qeth_ethtool.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index 9052c72d5b8f..19b9c8302d36 100644
--- 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,