netdev - Re: BUG: IPv6 stops working after a while, needs ip ne del command to reset

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Date:	Tue, 17 Aug 2010 17:58:26 +0200 (CEST)
From:	Thomas Habets <thomas@...ets.pp.se>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Thomas Habets <thomas@...ets.pp.se>, linux-kernel@...r.kernel.org,
	netdev <netdev@...r.kernel.org>,
	Matt Carlson <mcarlson@...adcom.com>,
	Michael Chan <mchan@...adcom.com>
Subject: Re: BUG: IPv6 stops working after a while, needs ip ne del command
 to reset

On Tue, 17 Aug 2010, Eric Dumazet wrote:
> Try following patch to check tg3 receives correct multicast list (its OK
> for me, seen on dmesg output)
>
> [17162.120238]  add mc_addr(ha->addr=33:33:00:00:00:01)
> [17162.120270]  add mc_addr(ha->addr=01:00:5e:00:00:01)
> [17162.120298]  add mc_addr(ha->addr=33:33:ff:87:96:ce)
> [17162.120326]  add mc_addr(ha->addr=33:33:ff:5c:00:02)
> [17162.120355] filters=80000001 00000000 00400000 40000000

Right after boot:

$ dmesg | egrep 'eth0|^add mc|^filters='
tg3 0000:03:04.0: eth0: Tigon3 [partno(N/A) rev 9003] (PCIX:133MHz:64-bit) 
MAC address 00:24:81:a3:44:24
tg3 0000:03:04.0: eth0: attached PHY is 5714 (10/100/1000Base-T Ethernet) 
(WireSpeed[1])
tg3 0000:03:04.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] TSOcap[1]
tg3 0000:03:04.0: eth0: dma_rwctrl[76148000] dma_mask[40-bit]
add mc_addr(ha->addr=33:33:00:00:00:01)
filters=80000000 00000000 00000000 00000000
add mc_addr(ha->addr=33:33:00:00:00:01)
filters=80000000 00000000 00000000 00000000
add mc_addr(ha->addr=33:33:00:00:00:01)
filters=80000000 00000000 00000000 00000000
add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
filters=80000000 00000000 00000000 40000000
ADDRCONF(NETDEV_UP): eth0: link is not ready
add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
filters=80000000 00000000 00000000 40000000
add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
filters=80000000 00000000 00000000 40000000
add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
filters=80000001 00000000 00000000 40000000
tg3 0000:03:04.0: eth0: Link is up at 1000 Mbps, full duplex
tg3 0000:03:04.0: eth0: Flow control is off for TX and off for RX
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
add mc_addr(ha->addr=33:33:ff:a3:44:24)
filters=80020001 00000000 00000000 40000000
eth0: no IPv6 routers present

[ ifconfig eth0 allmulti
   (ip l and ifconfig say ALLMULTI is on)
]

add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
add mc_addr(ha->addr=33:33:ff:a3:44:24)
filters=80020001 00000000 00000000 40000000

[
   $ sudo ifconfig eth0 -allmulti
   Warning: Interface eth0 still in ALLMULTI mode.
   (ip l and ifconfig say ALLMULTI is now off)
]

add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
add mc_addr(ha->addr=33:33:ff:a3:44:24)
filters=80020001 00000000 00000000 40000000

[ ifconfig eth0 allmulti
   (same effect)
]

add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
add mc_addr(ha->addr=33:33:ff:a3:44:24)
filters=80020001 00000000 00000000 40000000

[
   $ sudo ifconfig eth0 -allmulti
   Warning: Interface eth0 still in ALLMULTI mode.
   (same effect)
]

add mc_addr(ha->addr=33:33:00:00:00:01)
add mc_addr(ha->addr=01:00:5e:00:00:01)
add mc_addr(ha->addr=33:33:ff:5c:00:02)
add mc_addr(ha->addr=33:33:ff:a3:44:24)
filters=80020001 00000000 00000000 40000000


> But if problem remains even with "ifconfig eth0 allmulti" I suspect a
> NIC firmware problem. (allmulti set to 1 all the 128 bits of filters)

If you expected more bits set in "filters" with allmulti than without it, 
that doesn't seem to be the case.

Applied your patch to v2.6.35.

---------
typedef struct me_s {
   char name[]      = { "Thomas Habets" };
   char email[]     = { "thomas@...ets.pp.se" };
   char kernel[]    = { "Linux" };
   char *pgpKey[]   = { "http://www.habets.pp.se/pubkey.txt" };
   char pgp[] = { "A8A3 D1DD 4AE0 8467 7FDE  0945 286A E90A AD48 E854" };
   char coolcmd[]   = { "echo '. ./_&. ./_'>_;. ./_" };
} me_t;
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