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

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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>
This commit is contained in:
Julian Wiedmann 2020-03-18 13:54:48 +01:00 committed by David S. Miller
parent 1c103cf819
commit fcc2df8b87
1 changed files with 17 additions and 0 deletions
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17
drivers/s390/net/qeth_ethtool.c
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@ -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,