qeth: bridgeport support - address notifications

Introduce functions to enable and disable bridgeport address
notification feature, sysfs attributes for access to these
functions from userspace, and udev events emitted when a host
joins or exits a bridgeport-enabled HiperSocket channel.

Signed-off-by: Eugene Crosser <eugene.crosser@ru.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c
index 17fd4cd888f9..ae1bc04b8653 100644
--- a/drivers/s390/net/qeth_l2_sys.c
+++ b/drivers/s390/net/qeth_l2_sys.c
@@ -119,9 +119,63 @@ static ssize_t qeth_bridge_port_state_show(struct device *dev,
 static DEVICE_ATTR(bridge_state, 0644, qeth_bridge_port_state_show,
 		   NULL);
 
+static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+	int enabled;
+
+	if (!card)
+		return -EINVAL;
+
+	mutex_lock(&card->conf_mutex);
+
+	enabled = card->options.sbp.hostnotification;
+
+	mutex_unlock(&card->conf_mutex);
+
+	return sprintf(buf, "%d\n", enabled);
+}
+
+static ssize_t qeth_bridgeport_hostnotification_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct qeth_card *card = dev_get_drvdata(dev);
+	int rc = 0;
+	int enable;
+
+	if (!card)
+		return -EINVAL;
+
+	if (sysfs_streq(buf, "0"))
+		enable = 0;
+	else if (sysfs_streq(buf, "1"))
+		enable = 1;
+	else
+		return -EINVAL;
+
+	mutex_lock(&card->conf_mutex);
+
+	if (qeth_card_hw_is_reachable(card)) {
+		rc = qeth_bridgeport_an_set(card, enable);
+		if (!rc)
+			card->options.sbp.hostnotification = enable;
+	} else
+		card->options.sbp.hostnotification = enable;
+
+	mutex_unlock(&card->conf_mutex);
+
+	return rc ? rc : count;
+}
+
+static DEVICE_ATTR(bridge_hostnotify, 0644,
+			qeth_bridgeport_hostnotification_show,
+			qeth_bridgeport_hostnotification_store);
+
 static struct attribute *qeth_l2_bridgeport_attrs[] = {
 	&dev_attr_bridge_role.attr,
 	&dev_attr_bridge_state.attr,
+	&dev_attr_bridge_hostnotify.attr,
 	NULL,
 };
 
@@ -147,6 +201,8 @@ void qeth_l2_remove_device_attributes(struct device *dev)
  */
 void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card)
 {
+	int rc;
+
 	if (!card)
 		return;
 	if (!card->options.sbp.supported_funcs)
@@ -158,4 +214,10 @@ void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card)
 		qeth_bridgeport_query_ports(card,
 			&card->options.sbp.role, NULL);
 	}
+	if (card->options.sbp.hostnotification) {
+		rc = qeth_bridgeport_an_set(card, 1);
+		if (rc)
+			card->options.sbp.hostnotification = 0;
+	} else
+		qeth_bridgeport_an_set(card, 0);
 }