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| author | Muhammad Sammar <muhammads@mellanox.com> | 2018-08-28 14:45:30 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-09-06 13:35:16 -0600 |
| commit | 142a9c287613560edf5a03c8d142c8b6ebc1995b (patch) | |
| tree | 8b1167864971972ae90d84e7a43da815748a1c55 | |
| parent | 6c75520f7e5a6a353f3b332509d205e213d05855 (diff) | |
| download | linux-142a9c287613560edf5a03c8d142c8b6ebc1995b.tar.bz2 | |
IB/ipoib: Ensure that MTU isn't less than minimum permitted
It is illegal to change MTU to a value lower than the minimum MTU
stated in ethernet spec. In addition to that we need to add 4 bytes
for encapsulation header (IPOIB_ENCAP_LEN).
Before "ifconfig ib0 mtu 0" command, succeeds while it obviously shouldn't.
Signed-off-by: Muhammad Sammar <muhammads@mellanox.com>
Reviewed-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index e3d28f9ad9c0..2d20de72e67f 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -243,7 +243,8 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu) return 0; } - if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) + if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) || + new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) return -EINVAL; priv->admin_mtu = new_mtu; |