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netdev-linux: Add MTU check before setting MTU.

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Following patch check if current MTU needs to be changed before
issuing set-mtu ioctl.

Suggested-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Pravin B Shelar
2012-01-25 15:44:26 -08:00
parent fe4a02e4fa
commit 153e54814d
1 changed files with 4 additions and 0 deletions
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4
lib/netdev-linux.c
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@@ -1030,6 +1030,10 @@ netdev_linux_set_mtu(const struct netdev *netdev_, int mtu)
struct ifreq ifr; struct ifreq ifr;
int error; int error;
if (netdev_dev->cache_valid & VALID_MTU &&
netdev_dev->mtu == mtu) {
return 0;
}
ifr.ifr_mtu = mtu; ifr.ifr_mtu = mtu;
error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr, error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
SIOCSIFMTU, "SIOCSIFMTU"); SIOCSIFMTU, "SIOCSIFMTU");