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IB/IPoIB: Forward MTU change to driver below

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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@mellanox.com>
Reviewed by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Erez Shitrit 2017-05-23 11:42:52 +03:00 committed by Doug Ledford
parent 98e77d9fd7
commit ed7b521d8a
1 changed files with 17 additions and 2 deletions
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19
drivers/infiniband/ulp/ipoib/ipoib_main.c
View file

@ -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 */