Messages in this thread Patch in this message | | | From | Jonathan Toppins <> | Subject | [PATCH net v3 2/2] bonding: 802.3ad: fix no transmission of LACPDUs | Date | Mon, 15 Aug 2022 11:08:35 -0400 |
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This is caused by the global variable ad_ticks_per_sec being zero as demonstrated by the reproducer script discussed below. This causes all timer values in __ad_timer_to_ticks to be zero, resulting in the periodic timer to never fire.
To reproduce: Run the script in `tools/testing/selftests/drivers/net/bonding/bond-break-lacpdu-tx.sh` which puts bonding into a state where it never transmits LACPDUs.
line 44: ip link add fbond type bond mode 4 miimon 200 \ xmit_hash_policy 1 ad_actor_sys_prio 65535 lacp_rate fast setting bond param: ad_actor_sys_prio given: params.ad_actor_system = 0 call stack: bond_option_ad_actor_sys_prio() -> bond_3ad_update_ad_actor_settings() -> set ad.system.sys_priority = bond->params.ad_actor_sys_prio -> ad.system.sys_mac_addr = bond->dev->dev_addr; because params.ad_actor_system == 0 results: ad.system.sys_mac_addr = bond->dev->dev_addr
line 48: ip link set fbond address 52:54:00:3B:7C:A6 setting bond MAC addr call stack: bond->dev->dev_addr = new_mac
line 52: ip link set fbond type bond ad_actor_sys_prio 65535 setting bond param: ad_actor_sys_prio given: params.ad_actor_system = 0 call stack: bond_option_ad_actor_sys_prio() -> bond_3ad_update_ad_actor_settings() -> set ad.system.sys_priority = bond->params.ad_actor_sys_prio -> ad.system.sys_mac_addr = bond->dev->dev_addr; because params.ad_actor_system == 0 results: ad.system.sys_mac_addr = bond->dev->dev_addr
line 60: ip link set veth1-bond down master fbond given: params.ad_actor_system = 0 params.mode = BOND_MODE_8023AD ad.system.sys_mac_addr == bond->dev->dev_addr call stack: bond_enslave -> bond_3ad_initialize(); because first slave -> if ad.system.sys_mac_addr != bond->dev->dev_addr return results: Nothing is run in bond_3ad_initialize() because dev_add equals sys_mac_addr leaving the global ad_ticks_per_sec zero as it is never initialized anywhere else.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Jonathan Toppins <jtoppins@redhat.com> ---
Notes: v2: * split this fix from the reproducer v3: * rebased to latest net/master
drivers/net/bonding/bond_3ad.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index d7fb33c078e8..957d30db6f95 100644 --- a/drivers/net/bonding/bond_3ad.c +++ b/drivers/net/bonding/bond_3ad.c @@ -84,7 +84,8 @@ enum ad_link_speed_type { static const u8 null_mac_addr[ETH_ALEN + 2] __long_aligned = { 0, 0, 0, 0, 0, 0 }; -static u16 ad_ticks_per_sec; + +static u16 ad_ticks_per_sec = 1000 / AD_TIMER_INTERVAL; static const int ad_delta_in_ticks = (AD_TIMER_INTERVAL * HZ) / 1000; static const u8 lacpdu_mcast_addr[ETH_ALEN + 2] __long_aligned = -- 2.31.1
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