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authorMohammed Gamal <mgamal@redhat.com>2017-10-16 15:20:32 +0200
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2017-10-16 16:00:44 -0400
commite1043a4bb9fce6cfc7d55c5767e429a18ac8c4eb (patch)
tree5dee0a6c3911c54c07de1a0842e9c284de9f345f /drivers/net/xen-netback
parenteac779aa509d453a55da0ea4302bdb79c4e0854f (diff)
xen-netfront, xen-netback: Use correct minimum MTU values
RFC791 specifies the minimum MTU to be 68, while xen-net{front|back} drivers use a minimum value of 0. When set MTU to 0~67 with xen_net{front|back} driver, the network will become unreachable immediately, the guest can no longer be pinged. xen_net{front|back} should not allow the user to set this value which causes network problems. Reported-by: Chen Shi <cheshi@redhat.com> Signed-off-by: Mohammed Gamal <mgamal@redhat.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r--drivers/net/xen-netback/interface.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index ee8ed9da00ad..4491ca5aee90 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -486,7 +486,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
- dev->min_mtu = 0;
+ dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
/*