s390/qeth: add VNICC get/set timeout support

HiperSockets allow configuring so called VNIC Characteristics (VNICC)
that influence how the underlying hardware handles packets. For VNICCs,
additional commands for getting and setting timeouts are available.
Currently, the learning VNICC uses these commands.

* Learning VNICC: If learning is enabled on a qeth device, the device
  learns the source MAC addresses of outgoing packets and incoming
  packets to those learned MAC addresses are received.

For learning, the timeout specifies the idle period in seconds, after
which the underlying hardware removes a learned MAC address again.

This patch adds support for the IPA commands that are required to get
and set the current timeout values for the learning VNIC characteristic.
Also, it introduces the sysfs interface that allows users to configure
the timeout.

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

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c
index 01936f7dbe7e..4608daedb204 100644
--- a/drivers/s390/net/qeth_l2_sys.c
+++ b/drivers/s390/net/qeth_l2_sys.c
@@ -309,6 +309,47 @@ static u32 qeth_l2_vnicc_sysfs_attr_to_char(const char *attr_name)
 	return 0;
 }
 
+/* get current timeout setting */
+static ssize_t qeth_vnicc_timeout_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+	u32 timeout;
+	int rc;
+
+	if (!card)
+		return -EINVAL;
+
+	rc = qeth_l2_vnicc_get_timeout(card, &timeout);
+	if (rc == -EBUSY)
+		return sprintf(buf, "n/a (BridgePort)\n");
+	if (rc == -EOPNOTSUPP)
+		return sprintf(buf, "n/a\n");
+	return rc ? rc : sprintf(buf, "%d\n", timeout);
+}
+
+/* change timeout setting */
+static ssize_t qeth_vnicc_timeout_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+	u32 timeout;
+	int rc;
+
+	if (!card)
+		return -EINVAL;
+
+	rc = kstrtou32(buf, 10, &timeout);
+	if (rc)
+		return rc;
+
+	mutex_lock(&card->conf_mutex);
+	rc = qeth_l2_vnicc_set_timeout(card, timeout);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
+}
+
 /* get current setting of characteristic */
 static ssize_t qeth_vnicc_char_show(struct device *dev,
 				    struct device_attribute *attr, char *buf)
@@ -359,6 +400,8 @@ static DEVICE_ATTR(flooding, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store);
 static DEVICE_ATTR(mcast_flooding, 0644, qeth_vnicc_char_show,
 		   qeth_vnicc_char_store);
 static DEVICE_ATTR(learning, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store);
+static DEVICE_ATTR(learning_timeout, 0644, qeth_vnicc_timeout_show,
+		   qeth_vnicc_timeout_store);
 static DEVICE_ATTR(takeover_setvmac, 0644, qeth_vnicc_char_show,
 		   qeth_vnicc_char_store);
 static DEVICE_ATTR(takeover_learning, 0644, qeth_vnicc_char_show,
@@ -371,6 +414,7 @@ static struct attribute *qeth_l2_vnicc_attrs[] = {
 	&dev_attr_flooding.attr,
 	&dev_attr_mcast_flooding.attr,
 	&dev_attr_learning.attr,
+	&dev_attr_learning_timeout.attr,
 	&dev_attr_takeover_setvmac.attr,
 	&dev_attr_takeover_learning.attr,
 	&dev_attr_bridge_invisible.attr,