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Date: Thu, 16 Jul 2015 19:48:07 +0800 From: Ding Tianhong <dingtianhong@...wei.com> To: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>, "j.vosburgh@...il.com >> Jay Vosburgh" <j.vosburgh@...il.com>, "vfalico@...il.com >> Veaceslav Falico" <vfalico@...il.com>, Andy Gospodarek <gospo@...ulusnetworks.com>, Netdev <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, <fengtiantian@...wei.com>, "hahaer.guo@...wei.com >> Guozhibin (Hahaer)" <hahaer.guo@...wei.com> Subject: Re: [PATCH] bonding: correct the MAC address for "follow" fail_over_mac policy On 2015/7/16 17:24, Nikolay Aleksandrov wrote: > On 07/16/2015 10:30 AM, Ding Tianhong wrote: >> The "follow" fail_over_mac policy is useful for multiport devices that >> either become confused or incur a performance penalty when multiple >> ports are programmed with the same MAC address, but the same MAC >> address still may happened by this steps for this policy: >> >> 1) echo +eth0 > /sys/class/net/bond0/bonding/slaves >> bond0 has the same mac address with eth0, it is MAC1. >> >> 2) echo +eth1 > /sys/class/net/bond0/bonding/slaves >> eth1 is backup, eth1 has MAC2. >> >> 3) ifconfig eth0 down >> eth1 became active slave, bond will swap MAC for eth0 and eth1, >> so eth1 has MAC1, and eth0 has MAC2. >> >> 4) ifconfig eth1 down >> there is no active slave, and eth1 still has MAC1, eth2 has MAC2. >> >> 5) ifconfig eth0 up >> the eth0 became active slave again, the bond set eth0 to MAC1. >> >> Something wrong here, then if you set eth1 up, the eth0 and eth1 will have the same >> MAC address, it will break this policy for ACTIVE_BACKUP mode. >> >> This patch will fix this problem by finding the old active slave and >> swap them MAC address before change active slave. >> >> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com> >> --- >> drivers/net/bonding/bond_main.c | 20 ++++++++++++++++++++ >> 1 file changed, 20 insertions(+) >> > > This doesn't seem to be true: > ~# cat /sys/class/net/bond0/bonding/fail_over_mac > follow 2 > root@...ian:~# ip l sh eth1 > 3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > root@...ian:~# ip l sh eth2 > 4: eth2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:4f:a5:99 brd ff:ff:ff:ff:ff:ff > root@...ian:~# ip l sh bond0 > 26: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > > *eth1 is the first and active slave and bond0 has taken its mac. > Now trying your steps: > Step 3) (bringing down the active eth1) > root@...ian:~# ip l set eth1 down > root@...ian:~# ip l sh bond0 > 26: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > root@...ian:~# ip l sh eth1 > 3: eth1: <BROADCAST,MULTICAST,SLAVE> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT group default qlen 1000 > link/ether 52:54:00:4f:a5:99 brd ff:ff:ff:ff:ff:ff > root@...ian:~# ip l sh eth2 > 4: eth2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > > *The mac addresses of eth1 and eth2 are correctly swapped, so far so good. > > Step 4) (bringing down the active eth2) > root@...ian:~# ip l set eth2 down > 3: eth1: <BROADCAST,MULTICAST,SLAVE> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT group default qlen 1000 > link/ether 52:54:00:4f:a5:99 brd ff:ff:ff:ff:ff:ff > 4: eth2: <BROADCAST,MULTICAST,SLAVE> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT group default qlen 1000 > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > 26: bond0: <NO-CARRIER,BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > > *eth2 has kept the mac address of the bond and they're both down now > > Step 5) (bring eth1 up again and observe the macs) > ~# ip l set eth1 up > 3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > 4: eth2: <BROADCAST,MULTICAST,SLAVE> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT group default qlen 1000 > link/ether 52:54:00:4f:a5:99 brd ff:ff:ff:ff:ff:ff > 26: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > > *The macs are correctly swapped and there's no such bug. > > Step 6(?) bring eth2 up > ~# ip l set eth2 up > 3: eth1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > 4: eth2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master bond0 state UP mode DEFAULT group default qlen 1000 > link/ether 52:54:00:4f:a5:99 brd ff:ff:ff:ff:ff:ff > 26: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default > link/ether 52:54:00:3f:47:69 brd ff:ff:ff:ff:ff:ff > > *Still correct. > > Also the mac address that gets set is dev_addr which is changed when > the swapping is done, if you'd like to get the original mac address > you should be using slave->perm_hwaddr. > Hi Nik: Which kernel version do you use, I test this on kernel 3.19.8 and 4.2-rc2, this problem exist on both version, maybe I miss something? Ding > Cheers, > Nik > > . > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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