X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fnetdev-linux.c;h=49475360db0344bf834bd6847c9006a3280b7855;hb=a79c50f3df6197381c0ad8e91216ba2c5253473d;hp=9ff286ee4fe75b0031c2f24dae02a66622dbb0f9;hpb=a57a8488da2e6e02f515230d42a958126971ba8e;p=openvswitch

diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index 9ff286ee..49475360 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -802,9 +802,9 @@ netdev_linux_recv(struct netdev *netdev_, void *data, size_t size)
     }
 
     for (;;) {
-        ssize_t retval = read(netdev->fd, data, size);
+        ssize_t retval = recv(netdev->fd, data, size, MSG_TRUNC);
         if (retval >= 0) {
-            return retval;
+            return retval <= size ? retval : -EMSGSIZE;
         } else if (errno != EINTR) {
             if (errno != EAGAIN) {
                 VLOG_WARN_RL(&rl, "error receiving Ethernet packet on %s: %s",
@@ -1030,6 +1030,10 @@ netdev_linux_set_mtu(const struct netdev *netdev_, int mtu)
     struct ifreq ifr;
     int error;
 
+    if (netdev_dev->cache_valid & VALID_MTU &&
+        netdev_dev->mtu == mtu) {
+        return 0;
+    }
     ifr.ifr_mtu = mtu;
     error = netdev_linux_do_ioctl(netdev_get_name(netdev_), &ifr,
                                   SIOCSIFMTU, "SIOCSIFMTU");