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Date: Fri, 27 Sep 2019 09:43:55 +0000
From: "zhangsha (A)" <zhangsha.zhang@...wei.com>
To: Aleksei Zakharov <zaharov@...ectel.ru>,
Jay Vosburgh <jay.vosburgh@...onical.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Fwd: [PATCH] bonding/802.3ad: fix slave initialization states
race
> -----Original Message-----
> From: Aleksei Zakharov [mailto:zaharov@...ectel.ru]
> Sent: 2019年9月25日 19:02
> To: Jay Vosburgh <jay.vosburgh@...onical.com>
> Cc: netdev@...r.kernel.org; zhangsha (A) <zhangsha.zhang@...wei.com>
> Subject: Re: Fwd: [PATCH] bonding/802.3ad: fix slave initialization states race
>
> ср, 25 сент. 2019 г. в 03:31, Jay Vosburgh <jay.vosburgh@...onical.com>:
> >
> > Алексей Захаров wrote:
> > [...]
> > >Right after reboot one of the slaves hangs with actor port state 71
> > >and partner port state 1.
> > >It doesn't send lacpdu and seems to be broken.
> > >Setting link down and up again fixes slave state.
> > [...]
> >
> > I think I see what failed in the first patch, could you test
> > the following patch? This one is for net-next, so you'd need to again
> > swap slave_err / netdev_err for the Ubuntu 4.15 kernel.
> >
> I've tested new patch. It seems to work. I can't reproduce the bug with this
> patch.
> There are two types of messages when link becomes up:
> First:
> bond-san: EVENT 1 llu 4294895911 slave eth2
> 8021q: adding VLAN 0 to HW filter on device eth2
> bond-san: link status definitely down for interface eth2, disabling it
> mlx4_en: eth2: Link Up
> bond-san: EVENT 4 llu 4294895911 slave eth2
> bond-san: link status up for interface eth2, enabling it in 500 ms
> bond-san: invalid new link 3 on slave eth2
> bond-san: link status definitely up for interface eth2, 10000 Mbps full duplex
> Second:
> bond-san: EVENT 1 llu 4295147594 slave eth2
> 8021q: adding VLAN 0 to HW filter on device eth2
> mlx4_en: eth2: Link Up
> bond-san: EVENT 4 llu 4295147594 slave eth2
> bond-san: link status up again after 0 ms for interface eth2
> bond-san: link status definitely up for interface eth2, 10000 Mbps full duplex
>
> These messages (especially "invalid new link") look a bit unclear from sysadmin
> point of view.
> But lacp seems to work fine, thank you!
>
I tests the patch by skipping the bond_update_speed_duplex() function when
the bond receiving a 'NETDEV_UP' event, so that I can force the bond entering status
BOND_LINK_FAIL. In this scenario, my lacp seems to work fine.
Messages I got:
[24662.081877] bond0: link status definitely down for interface eth2, disabling it
[24662.081881] bond0: first active interface up!
[24684.153871] bond0: link status up again after 0 ms for interface eth2
[24684.156846] bond0: link status definitely up for interface eth2, 10000 Mbps full duplex
[24684.156851] bond0: first active interface up!
> > diff --git a/drivers/net/bonding/bond_main.c
> > b/drivers/net/bonding/bond_main.c index 931d9d935686..5e248588259a
> > 100644
> > --- a/drivers/net/bonding/bond_main.c
> > +++ b/drivers/net/bonding/bond_main.c
> > @@ -1617,6 +1617,7 @@ int bond_enslave(struct net_device *bond_dev,
> struct net_device *slave_dev,
> > if (bond->params.miimon) {
> > if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
> > if (bond->params.updelay) {
> > +/*XXX*/slave_info(bond_dev, slave_dev, "BOND_LINK_BACK initial
> > +state\n");
> > bond_set_slave_link_state(new_slave,
> > BOND_LINK_BACK,
> >
> > BOND_SLAVE_NOTIFY_NOW); @@ -2086,8 +2087,7 @@ static int
> bond_miimon_inspect(struct bonding *bond)
> > ignore_updelay = !rcu_dereference(bond->curr_active_slave);
> >
> > bond_for_each_slave_rcu(bond, slave, iter) {
> > - slave->new_link = BOND_LINK_NOCHANGE;
> > - slave->link_new_state = slave->link;
> > + bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
> >
> > link_state = bond_check_dev_link(bond, slave->dev, 0);
> >
> > @@ -2096,8 +2096,6 @@ static int bond_miimon_inspect(struct bonding
> *bond)
> > if (link_state)
> > continue;
> >
> > - bond_propose_link_state(slave, BOND_LINK_FAIL);
> > - commit++;
> > slave->delay = bond->params.downdelay;
> > if (slave->delay) {
> > slave_info(bond->dev, slave->dev,
> > "link status down for %sinterface, disabling it in %d ms\n", @@ -2106,6
> +2104,7 @@ static int bond_miimon_inspect(struct bonding *bond)
> > (bond_is_active_slave(slave) ?
> > "active " : "backup ") : "",
> > bond->params.downdelay *
> > bond->params.miimon);
> > + slave->link = BOND_LINK_FAIL;
> > }
> > /*FALLTHRU*/
> > case BOND_LINK_FAIL:
> > @@ -2121,7 +2120,7 @@ static int bond_miimon_inspect(struct bonding
> *bond)
> > }
> >
> > if (slave->delay <= 0) {
> > - slave->new_link = BOND_LINK_DOWN;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_DOWN);
> > commit++;
> > continue;
> > }
> > @@ -2133,15 +2132,13 @@ static int bond_miimon_inspect(struct bonding
> *bond)
> > if (!link_state)
> > continue;
> >
> > - bond_propose_link_state(slave, BOND_LINK_BACK);
> > - commit++;
> > slave->delay = bond->params.updelay;
> > -
> > if (slave->delay) {
> > slave_info(bond->dev, slave->dev, "link status up, enabling
> it in %d ms\n",
> > ignore_updelay ? 0 :
> > bond->params.updelay *
> > bond->params.miimon);
> > + slave->link = BOND_LINK_BACK;
> > }
> > /*FALLTHRU*/
> > case BOND_LINK_BACK:
> > @@ -2158,7 +2155,7 @@ static int bond_miimon_inspect(struct bonding
> *bond)
> > slave->delay = 0;
> >
> > if (slave->delay <= 0) {
> > - slave->new_link = BOND_LINK_UP;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_UP);
> > commit++;
> > ignore_updelay = false;
> > continue; @@ -2196,7 +2193,7 @@ static
> > void bond_miimon_commit(struct bonding *bond)
> > struct slave *slave, *primary;
> >
> > bond_for_each_slave(bond, slave, iter) {
> > - switch (slave->new_link) {
> > + switch (slave->link_new_state) {
> > case BOND_LINK_NOCHANGE:
> > /* For 802.3ad mode, check current slave speed and
> > * duplex again in case its port was disabled
> > after @@ -2268,8 +2265,8 @@ static void bond_miimon_commit(struct
> > bonding *bond)
> >
> > default:
> > slave_err(bond->dev, slave->dev, "invalid new link %d on
> slave\n",
> > - slave->new_link);
> > - slave->new_link = BOND_LINK_NOCHANGE;
> > + slave->link_new_state);
> > + bond_propose_link_state(slave,
> > + BOND_LINK_NOCHANGE);
> >
> > continue;
> > }
> > @@ -2677,13 +2674,13 @@ static void bond_loadbalance_arp_mon(struct
> bonding *bond)
> > bond_for_each_slave_rcu(bond, slave, iter) {
> > unsigned long trans_start =
> > dev_trans_start(slave->dev);
> >
> > - slave->new_link = BOND_LINK_NOCHANGE;
> > + bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
> >
> > if (slave->link != BOND_LINK_UP) {
> > if (bond_time_in_interval(bond, trans_start, 1) &&
> > bond_time_in_interval(bond,
> > slave->last_rx, 1)) {
> >
> > - slave->new_link = BOND_LINK_UP;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_UP);
> > slave_state_changed = 1;
> >
> > /* primary_slave has no meaning in
> > round-robin @@ -2708,7 +2705,7 @@ static void
> bond_loadbalance_arp_mon(struct bonding *bond)
> > if (!bond_time_in_interval(bond, trans_start, 2) ||
> > !bond_time_in_interval(bond,
> > slave->last_rx, 2)) {
> >
> > - slave->new_link = BOND_LINK_DOWN;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_DOWN);
> > slave_state_changed = 1;
> >
> > if (slave->link_failure_count <
> > UINT_MAX) @@ -2739,8 +2736,8 @@ static void
> bond_loadbalance_arp_mon(struct bonding *bond)
> > goto re_arm;
> >
> > bond_for_each_slave(bond, slave, iter) {
> > - if (slave->new_link != BOND_LINK_NOCHANGE)
> > - slave->link = slave->new_link;
> > + if (slave->link_new_state != BOND_LINK_NOCHANGE)
> > + slave->link = slave->link_new_state;
> > }
> >
> > if (slave_state_changed) { @@ -2763,9 +2760,9 @@
> > static void bond_loadbalance_arp_mon(struct bonding *bond) }
> >
> > /* Called to inspect slaves for active-backup mode ARP monitor link
> > state
> > - * changes. Sets new_link in slaves to specify what action should
> > take
> > - * place for the slave. Returns 0 if no changes are found, >0 if
> > changes
> > - * to link states must be committed.
> > + * changes. Sets proposed link state in slaves to specify what
> > + action
> > + * should take place for the slave. Returns 0 if no changes are
> > + found, >0
> > + * if changes to link states must be committed.
> > *
> > * Called with rcu_read_lock held.
> > */
> > @@ -2777,12 +2774,12 @@ static int bond_ab_arp_inspect(struct bonding
> *bond)
> > int commit = 0;
> >
> > bond_for_each_slave_rcu(bond, slave, iter) {
> > - slave->new_link = BOND_LINK_NOCHANGE;
> > + bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
> > last_rx = slave_last_rx(bond, slave);
> >
> > if (slave->link != BOND_LINK_UP) {
> > if (bond_time_in_interval(bond, last_rx, 1)) {
> > - slave->new_link = BOND_LINK_UP;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_UP);
> > commit++;
> > }
> > continue;
> > @@ -2810,7 +2807,7 @@ static int bond_ab_arp_inspect(struct bonding
> *bond)
> > if (!bond_is_active_slave(slave) &&
> > !rcu_access_pointer(bond->current_arp_slave) &&
> > !bond_time_in_interval(bond, last_rx, 3)) {
> > - slave->new_link = BOND_LINK_DOWN;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_DOWN);
> > commit++;
> > }
> >
> > @@ -2823,7 +2820,7 @@ static int bond_ab_arp_inspect(struct bonding
> *bond)
> > if (bond_is_active_slave(slave) &&
> > (!bond_time_in_interval(bond, trans_start, 2) ||
> > !bond_time_in_interval(bond, last_rx, 2))) {
> > - slave->new_link = BOND_LINK_DOWN;
> > + bond_propose_link_state(slave,
> > + BOND_LINK_DOWN);
> > commit++;
> > }
> > }
> > @@ -2843,7 +2840,7 @@ static void bond_ab_arp_commit(struct bonding
> *bond)
> > struct slave *slave;
> >
> > bond_for_each_slave(bond, slave, iter) {
> > - switch (slave->new_link) {
> > + switch (slave->link_new_state) {
> > case BOND_LINK_NOCHANGE:
> > continue;
> >
> > @@ -2893,8 +2890,9 @@ static void bond_ab_arp_commit(struct bonding
> *bond)
> > continue;
> >
> > default:
> > - slave_err(bond->dev, slave->dev, "impossible: new_link %d on
> slave\n",
> > - slave->new_link);
> > + slave_err(bond->dev, slave->dev,
> > + "impossible: link_new_state %d on slave\n",
> > + slave->link_new_state);
> > continue;
> > }
> >
> > @@ -3133,6 +3131,7 @@ static int bond_slave_netdev_event(unsigned long
> event,
> > * let link-monitoring (miimon) set it right when correct
> > * speeds/duplex are available.
> > */
> > +/*XXX*/slave_info(bond_dev, slave_dev, "EVENT %lu llu %lu\n", event,
> > +slave->last_link_up);
> > if (bond_update_speed_duplex(slave) &&
> > BOND_MODE(bond) == BOND_MODE_8023AD) {
> > if (slave->last_link_up) diff --git
> > a/include/net/bonding.h b/include/net/bonding.h index
> > f7fe45689142..d416af72404b 100644
> > --- a/include/net/bonding.h
> > +++ b/include/net/bonding.h
> > @@ -159,7 +159,6 @@ struct slave {
> > unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
> > s8 link; /* one of BOND_LINK_XXXX */
> > s8 link_new_state; /* one of BOND_LINK_XXXX */
> > - s8 new_link;
> > u8 backup:1, /* indicates backup slave. Value corresponds with
> > BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
> > inactive:1, /* indicates inactive slave */ @@ -549,7
> > +548,7 @@ static inline void bond_propose_link_state(struct slave
> > *slave, int state)
> >
> > static inline void bond_commit_link_state(struct slave *slave, bool
> > notify) {
> > - if (slave->link == slave->link_new_state)
> > + if (slave->link_new_state == BOND_LINK_NOCHANGE)
> > return;
> >
> > slave->link = slave->link_new_state;
> >
> >
> > ---
> > -Jay Vosburgh, jay.vosburgh@...onical.com
>
>
>
> --
> Best Regards,
> Aleksei Zakharov
> System administrator
> Selectel - hosting for professionals
> tel: +7 (812) 677-80-36
>
> www.selectel.com
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