Date: Mon, 31 Jul 2006 14:44:21 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Ian FREISLICH <if@hetzner.co.za> Cc: current@freebsd.org Subject: Re: em promiscuous mode bug? Message-ID: <20060731054421.GB35573@cdnetworks.co.kr> In-Reply-To: <E1G7Q8J-0003t9-LC@hetzner.co.za> References: <20060726022235.GB14991@cdnetworks.co.kr> <E1G7Q8J-0003t9-LC@hetzner.co.za>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Jul 31, 2006 at 07:16:03AM +0200, Ian FREISLICH wrote: > Pyun YongHyeon wrote: > > On Tue, Jul 25, 2006 at 08:07:04AM +0200, Ian FREISLICH wrote: > > > Hi > > > > > > It seems that placing an em(4) interface into promiscuous mode the > > > card stops doing hardware offload of 802.1Q tagging, in fact, it > > > stops tagging entirely if vlanhwtag is enabled on the card. > > > > > > With vlanhwtag: > > > 15:40:48.050645 00:00:5e:00:01:02 > 01:00:5e:00:00:12, ethertype IPv4 (0x0 > 800), length 70: (tos 0x10, ttl 255, id 44821, offset 0, flags [DF], proto: VRR > P (112), length: 56) 196.30.82.61 > 224.0.0.18: VRRPv2, Advertisement, vrid 2, > prio 10, authtype none, intvl 1s, length 36, addrs(7): 157.248.206.115,76.246.4 > 2.167,148.235.231.80,70.180.123.113,201.169.28.232,19.31.18.203,59.148.50.175 > > > > > > Without vlanhwtag: > > > 15:40:57.419522 00:00:5e:00:01:02 > 01:00:5e:00:00:12, ethertype 802.1Q (0 > x8100), length 74: vlan 1001, p 0, ethertype IPv4, (tos 0x10, ttl 255, id 44867 > , offset 0, flags [DF], proto: VRRP (112), length: 56) 196.30.82.61 > 224.0.0.1 > 8: VRRPv2, Advertisement, vrid 2, prio 10, authtype none, intvl 1s, length 36, > addrs(7): 157.248.206.115,76.246.42.176,8.148.142.115,171.178.137.11,211.216.40 > .239,67.124.122.122,253.155.32.152 > > > > > > The interface is placed in promiscuous mode by the carp driver. > > > > > > em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 > > > options=cb<RXCSUM,TXCSUM,VLAN_MTU,POLLING,VLAN_HWCSUM> > > > ether 00:04:23:cf:50:00 > > > media: Ethernet autoselect (1000baseTX <full-duplex>) > > > status: active > > > > > > vlan1001: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1 > 500 > > > inet 196.30.82.62 netmask 0xfffffff0 broadcast 196.30.82.63 > > > ether 00:04:23:cf:50:00 > > > media: Ethernet autoselect (1000baseTX <full-duplex>) > > > status: active > > > vlan: 1001 parent interface: em0 > > > > > > carp1001: flags=49<UP,LOOPBACK,RUNNING> mtu 1500 > > > inet 196.30.82.60 netmask 0xfffffff0 > > > carp: BACKUP vhid 2 advbase 1 advskew 0 > > > > > > > Hardware VLAN tagging was disabled in em(4) when it operates > > in promiscuous mode and em(4) will insert a VLAN tag in the > > driver. > > Um, no. When an em interface with hardware VLAN tagging enabled > is placed in promiscuous mode, it just _stops_ tagging. Entirely. > The 802.1Q vlan just breaks. > Would you try latest em(4) in CURRENT?(if_em.c, rev. 1.122) > Ian > > -- > Ian Freislich -- Regards, Pyun YongHyeon
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060731054421.GB35573>