From: Erez Shitrit <erezsh@xxxxxxxxxxxx>
This patch checks if there is a driver below that
needs to be updated on the new MTU and calls it
accordingly.
Signed-off-by: Erez Shitrit <erezsh@xxxxxxxxxxxx>
Reviewed by: Alex Vesker <valex@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
---
drivers/infiniband/ulp/ipoib/ipoib_main.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 2869d1adb1de..28068140800c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -233,6 +233,7 @@ static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_featu
static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
+ int ret = 0;
/* dev->mtu > 2K ==> connected mode */
if (ipoib_cm_admin_enabled(dev)) {
@@ -256,9 +257,23 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
ipoib_dbg(priv, "MTU must be smaller than the underlying "
"link layer MTU - 4 (%u)\n", priv->mcast_mtu);
- dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
+ new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
- return 0;
+ if (priv->rn_ops->ndo_change_mtu) {
+ bool carrier_status = netif_carrier_ok(dev);
+
+ netif_carrier_off(dev);
+
+ /* notify lower level on the real mtu */
+ ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
+
+ if (carrier_status)
+ netif_carrier_on(dev);
+ } else {
+ dev->mtu = new_mtu;
+ }
+
+ return ret;
}
/* Called with an RCU read lock taken */
--
2.12.2
--
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