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Add sync of VPP mtu changes into Linux interfaces

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This is a straight foward copy of the VPP L3 (packet) MTU into the Linux
host interface, for any change on an interface/sub-int for which a LIP is
defined.

As with Linux itself, no care is taken to ensure that the parent interface
(e0) has a higher MTU than the child interface (e0.10).

DBGvpp# create sub TenGigabitEthernet3/0/0 10
DBGvpp# lcp create TenGigabitEthernet3/0/0 host-if e0
DBGvpp# lcp create TenGigabitEthernet3/0/0.10 host-if e0.10
602: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set interface mtu packet 9216 TenGigabitEthernet3/0/0
602: e0: <BROADCAST,MULTICAST> mtu 9216 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set interface mtu packet 9050 TenGigabitEthernet3/0/0
602: e0: <BROADCAST,MULTICAST> mtu 9050 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set interface mtu packet 9050 TenGigabitEthernet3/0/0.10
602: e0: <BROADCAST,MULTICAST> mtu 9050 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9050 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set interface mtu packet 1500 TenGigabitEthernet3/0/0.10
602: e0: <BROADCAST,MULTICAST> mtu 9050 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set interface mtu packet 1500 TenGigabitEthernet3/0/0
602: e0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
603: e0.10@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
This commit is contained in:
Pim van Pelt
2021-08-13 15:02:31 +02:00
parent d8c988273e
commit 39bfa1615f
1 changed files with 27 additions and 0 deletions
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27
lcpng_if_sync.c
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@ -95,3 +95,30 @@ lcp_itf_admin_state_change (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
}
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(lcp_itf_admin_state_change);
static clib_error_t *
lcp_itf_mtu_change (vnet_main_t *vnm, u32 sw_if_index, u32 flags)
{
const lcp_itf_pair_t *lip;
vnet_sw_interface_t *si;
LCP_ITF_PAIR_DBG ("mtu_change: sw %U %u", format_vnet_sw_if_index_name, vnm,
sw_if_index, flags);
// Sync interface state changes into host
lip = lcp_itf_pair_get (lcp_itf_pair_find_by_phy (sw_if_index));
if (!lip)
return NULL;
si = vnet_get_sw_interface_or_null (vnm, sw_if_index);
if (!si)
return NULL;
LCP_ITF_PAIR_INFO ("mtu_change: %U mtu %u", format_lcp_itf_pair, lip,
si->mtu[VNET_MTU_L3]);
vnet_netlink_set_link_mtu (lip->lip_vif_index, si->mtu[VNET_MTU_L3]);
return NULL;
}
VNET_SW_INTERFACE_MTU_CHANGE_FUNCTION (lcp_itf_mtu_change);