[PATCH net-next 7/8] s390/qeth: implement ndo_bridge_getlink for learning_sync

Julian Wiedmann
2020-09-10T17:24:10Z

Documentation/networking/switchdev.txt and 'man bridge' indicate that the
learning_sync bridge attribute is used to indicate whether a given
device will sync MAC addresses learned on its device port to a master
bridge FDB.

learning_sync attribute can not be read while interface is offline (down).
See
'commit e6e771b3d897 ("s390/qeth: detach netdevice while card is offline")'
We return EOPNOTSUPP and not EONODEV in this case, because EONOTSUPP is the
only rc that is tolerated by 'bridge -d link show'.

Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
---
drivers/s390/net/qeth_l2_main.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index ef2962e03546..338bc62556cf 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -33,6 +33,7 @@ static void qeth_bridge_state_change(struct qeth_card *card,
struct qeth_ipa_cmd *cmd);
static void qeth_addr_change_event(struct qeth_card *card,
struct qeth_ipa_cmd *cmd);
+static bool qeth_bridgeport_is_in_use(struct qeth_card *card);
static void qeth_l2_vnicc_set_defaults(struct qeth_card *card);
static void qeth_l2_vnicc_init(struct qeth_card *card);
static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc,
@@ -836,6 +837,25 @@ static int qeth_l2_dev2br_an_set(struct qeth_card *card, bool enable)
return rc;
}

+static int qeth_l2_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
+ struct net_device *dev, u32 filter_mask,
+ int nlflags)
+{
+ struct qeth_priv *priv = netdev_priv(dev);
+ struct qeth_card *card = dev->ml_priv;
+ u16 mode = BRIDGE_MODE_UNDEF;
+
+ /* Do not even show qeth devs that cannot do bridge_setlink */
+ if (!priv->brport_hw_features || !netif_device_present(dev) ||
+ qeth_bridgeport_is_in_use(card))
+ return -EOPNOTSUPP;
+
+ return ndo_dflt_bridge_getlink(skb, pid, seq, dev,
+ mode, priv->brport_features,
+ priv->brport_hw_features,
+ nlflags, filter_mask, NULL);
+}
+
static const struct net_device_ops qeth_l2_netdev_ops = {
.ndo_open = qeth_open,
.ndo_stop = qeth_stop,
@@ -851,7 +871,8 @@ static const struct net_device_ops qeth_l2_netdev_ops = {
.ndo_vlan_rx_kill_vid = qeth_l2_vlan_rx_kill_vid,
.ndo_tx_timeout = qeth_tx_timeout,
.ndo_fix_features = qeth_fix_features,
- .ndo_set_features = qeth_set_features
+ .ndo_set_features = qeth_set_features,
+ .ndo_bridge_getlink = qeth_l2_bridge_getlink,
};

static const struct net_device_ops qeth_osn_netdev_ops = {
--
2.17.1