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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2021-06-08 16:59:51 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-06-23 14:42:41 +0200 |
| commit | aba26b38388e69c12c588f952c77d491c60afec6 (patch) | |
| tree | 557dd3cd1ee7807f77ef6fec06feb6f31f88881b | |
| parent | deeeb65c6ee404f2d1fb80b38b2730645c0f4663 (diff) | |
| download | linux-stable-aba26b38388e69c12c588f952c77d491c60afec6.tar.gz linux-stable-aba26b38388e69c12c588f952c77d491c60afec6.tar.bz2 linux-stable-aba26b38388e69c12c588f952c77d491c60afec6.zip | |
vrf: fix maximum MTU
[ Upstream commit 9bb392f62447d73cc7dd7562413a2cd9104c82f8 ]
My initial goal was to fix the default MTU, which is set to 65536, ie above
the maximum defined in the driver: 65535 (ETH_MAX_MTU).
In fact, it's seems more consistent, wrt min_mtu, to set the max_mtu to
IP6_MAX_MTU (65535 + sizeof(struct ipv6hdr)) and use it by default.
Let's also, for consistency, set the mtu in vrf_setup(). This function
calls ether_setup(), which set the mtu to 1500. Thus, the whole mtu config
is done in the same function.
Before the patch:
$ ip link add blue type vrf table 1234
$ ip link list blue
9: blue: <NOARP,MASTER> mtu 65536 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether fa:f5:27:70:24:2a brd ff:ff:ff:ff:ff:ff
$ ip link set dev blue mtu 65535
$ ip link set dev blue mtu 65536
Error: mtu greater than device maximum.
Fixes: 5055376a3b44 ("net: vrf: Fix ping failed when vrf mtu is set to 0")
CC: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/vrf.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index b9b7e00b72a8..bc96ac0c5769 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -1184,9 +1184,6 @@ static int vrf_dev_init(struct net_device *dev) dev->flags = IFF_MASTER | IFF_NOARP; - /* MTU is irrelevant for VRF device; set to 64k similar to lo */ - dev->mtu = 64 * 1024; - /* similarly, oper state is irrelevant; set to up to avoid confusion */ dev->operstate = IF_OPER_UP; netdev_lockdep_set_classes(dev); @@ -1620,7 +1617,8 @@ static void vrf_setup(struct net_device *dev) * which breaks networking. */ dev->min_mtu = IPV6_MIN_MTU; - dev->max_mtu = ETH_MAX_MTU; + dev->max_mtu = IP6_MAX_MTU; + dev->mtu = dev->max_mtu; } static int vrf_validate(struct nlattr *tb[], struct nlattr *data[], |