From: Stephen Hemminger <stephen@networkplumber.org>
Date: Fri, 27 Jul 2018 20:43:22 +0000 (-0700)
Subject: net: report min and max mtu network device settings
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3e7a50ceb11e;p=linux.git
net: report min and max mtu network device settings
Report the minimum and maximum MTU allowed on a device
via netlink so that it can be displayed by tools like
ip link.
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 553c438cabe31..43391e2d1153a 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -164,6 +164,8 @@ enum {
IFLA_CARRIER_UP_COUNT,
IFLA_CARRIER_DOWN_COUNT,
IFLA_NEW_IFINDEX,
+ IFLA_MIN_MTU,
+ IFLA_MAX_MTU,
__IFLA_MAX
};
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 92b6fa5d5f6ed..510d4f765a134 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1015,6 +1015,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ nla_total_size(4) /* IFLA_IF_NETNSID */
+ nla_total_size(4) /* IFLA_CARRIER_UP_COUNT */
+ nla_total_size(4) /* IFLA_CARRIER_DOWN_COUNT */
+ + nla_total_size(4) /* IFLA_MIN_MTU */
+ + nla_total_size(4) /* IFLA_MAX_MTU */
+ 0;
}
@@ -1601,6 +1603,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||
nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
+ nla_put_u32(skb, IFLA_MIN_MTU, dev->min_mtu) ||
+ nla_put_u32(skb, IFLA_MAX_MTU, dev->max_mtu) ||
nla_put_u32(skb, IFLA_GROUP, dev->group) ||
nla_put_u32(skb, IFLA_PROMISCUITY, dev->promiscuity) ||
nla_put_u32(skb, IFLA_NUM_TX_QUEUES, dev->num_tx_queues) ||
@@ -1732,6 +1736,8 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_IF_NETNSID] = { .type = NLA_S32 },
[IFLA_CARRIER_UP_COUNT] = { .type = NLA_U32 },
[IFLA_CARRIER_DOWN_COUNT] = { .type = NLA_U32 },
+ [IFLA_MIN_MTU] = { .type = NLA_U32 },
+ [IFLA_MAX_MTU] = { .type = NLA_U32 },
};
static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {