From: Erez Shitrit <erezsh@mellanox.com>
Date: Sun, 7 Jun 2015 10:36:11 +0000 (+0300)
Subject: IB/ipoib: Set MTU to max allowed by mode when mode changes
X-Git-Tag: v4.2-rc3~26^2~7
X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=edcd2a7474ba3b47e54c3c9a300287342de74766

IB/ipoib: Set MTU to max allowed by mode when mode changes

When switching between modes (datagram / connected) change the MTU
accordingly.
datagram mode up to 4K, connected mode up to (64K - 0x10).

Signed-off-by: ELi Cohen <eli@mellanox.com>
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 59604a7e5e3e..b2943c84a5dd 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -232,6 +232,7 @@ int ipoib_set_mode(struct net_device *dev, const char *buf)
 		ipoib_warn(priv, "enabling connected mode "
 			   "will cause multicast packet drops\n");
 		netdev_update_features(dev);
+		dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
 		rtnl_unlock();
 		priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;