Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3e7a50ce authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

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: default avatarStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3260155a

include/uapi/linux/if_link.h

+2 −0
Original line number Diff line number Diff line
@@ -164,6 +164,8 @@ enum { 
	IFLA_CARRIER_UP_COUNT,

	IFLA_CARRIER_DOWN_COUNT,

	IFLA_NEW_IFINDEX,

	IFLA_MIN_MTU,

	IFLA_MAX_MTU,

	__IFLA_MAX

};

net/core/rtnetlink.c

+6 −0
Original line number Diff line number Diff line
@@ -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] = {