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| author | Muhammad Sammar <muhammads@mellanox.com> | 2018-08-28 14:45:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-20 18:46:02 +0100 |
| commit | a618cca0438ba548cc15eef748560a1fd4174903 (patch) | |
| tree | 540811bf641174f27d87472ded25ca21cc7ad14c /drivers/infiniband/ulp | |
| parent | 2543eeba256ae4a7bbfa0c8531e34371bfe306f6 (diff) | |
| download | linux-a618cca0438ba548cc15eef748560a1fd4174903.tar.gz linux-a618cca0438ba548cc15eef748560a1fd4174903.tar.bz2 linux-a618cca0438ba548cc15eef748560a1fd4174903.zip | |
IB/ipoib: Ensure that MTU isn't less than minimum permitted
[ Upstream commit 142a9c287613560edf5a03c8d142c8b6ebc1995b ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/infiniband/ulp')
| -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 78dd36daac00..d8cb5bbe6eb5 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; |