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Force a sync of interfaces when VPP phy changes state

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When Linux changes link on a master interface, all of its children also change.
This is not true in VPP, where bringing down a phy while its sub-ints are up
will not change link on the sub-ints.

We are forced to undo that change by walking the sub-interfaces of a phy and
syncing their state back into linux.

For simplicity, just walk all interfaces, as others will be a no-op.

The approach may have to be revisited once netlink messages are
consumed, to ensure there is not an oscillation where netlink sets a
link, which forces all links to be reset, generating more netlink
messages, etc. Care should be taken when netlink consumption comes into
play!

DBGvpp# create sub TenGigabitEthernet3/0/0 1
DBGvpp# lcp create TenGigabitEthernet3/0/0 host-if e0
DBGvpp# lcp create TenGigabitEthernet3/0/0.1 host-if e0.1
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noop state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0  up
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UNKNOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0.1 up
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UNKNOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc noqueue state UP mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 down
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 up
DBGvpp# set int state TenGigabitEthernet3/0/0.1 down
593: e0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000

DBGvpp# set int state TenGigabitEthernet3/0/0 down
593: e0: <BROADCAST,MULTICAST> mtu 9000 qdisc mq state DOWN mode DEFAULT group default qlen 1000
594: e0.1@e0: <BROADCAST,MULTICAST,M-DOWN> mtu 9000 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
This commit is contained in:
Pim van Pelt
2021-08-13 14:33:03 +02:00
parent 7c15c84f6c
commit a3dc56c014
1 changed files with 32 additions and 8 deletions
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40
lcpng_if_sync.c
View File

@ -32,6 +32,29 @@
#include <vnet/devices/tap/tap.h>
#include <vnet/devices/netlink.h>
/* walk function to copy forward all sw interface link state flags into
* their counterpart LIP link state.
*/
static walk_rc_t
lcp_itf_pair_walk_sync_state_cb (index_t lipi, void *ctx)
{
lcp_itf_pair_t *lip;
vnet_sw_interface_t *phy;
lip = lcp_itf_pair_get (lipi);
if (!lip)
return WALK_CONTINUE;
phy = vnet_get_sw_interface_or_null (vnet_get_main(), lip->lip_phy_sw_if_index);
if (!phy) return WALK_CONTINUE;
LCP_ITF_PAIR_DBG ("walk_sync_state: lip %U flags %u",
format_lcp_itf_pair, lip,
phy->flags);
lcp_itf_set_link_state (lip, (phy->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP));
return WALK_CONTINUE;
}
static clib_error_t *
lcp_itf_admin_state_change (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
@ -49,23 +72,24 @@ lcp_itf_admin_state_change (vnet_main_t * vnm, u32 sw_if_index, u32 flags)
if (!lip) return NULL;
LCP_ITF_PAIR_INFO ("admin_state_change: %U flags %u", format_lcp_itf_pair, lip, flags);
lcp_itf_set_link_state (lip, (flags & VNET_HW_INTERFACE_FLAG_LINK_UP));
lcp_itf_set_link_state (lip, (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP));
// Sync PHY carrier changes into TAP
hi = vnet_get_hw_interface_or_null (vnm, sw_if_index);
si = vnet_get_sw_interface_or_null (vnm, lip->lip_host_sw_if_index);
if (!si || !hi) return NULL;
LCP_ITF_PAIR_INFO ("admin_state_change: hi %U si %U %u",
LCP_ITF_PAIR_DBG ("admin_state_change: hi %U si %U %u",
format_vnet_sw_if_index_name, vnm, hi->hw_if_index,
format_vnet_sw_if_index_name, vnm, si->sw_if_index,
flags);
tap_set_carrier (si->hw_if_index, (hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP));
// When Linux changes link on a master interface, all of its children also change.
// This is not true in VPP, so we are forced to undo that change by walking the
// sub-interfaces of a phy and syncing their state back into linux.
// For simplicity, just walk all interfaces.
lcp_itf_pair_walk (lcp_itf_pair_walk_sync_state_cb, 0);
tap_set_carrier (si->hw_if_index, (flags & VNET_HW_INTERFACE_FLAG_LINK_UP));
/* TODO(pim): is this right? see tap_set_speed() "Cannot open netns" error
if (flags & VNET_HW_INTERFACE_FLAG_LINK_UP) {
tap_set_speed (si->hw_if_index, hi->link_speed);
}
*/
return NULL;
}