netdev - em1 is visible to iproute2 but not ethtool or tcpdump

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Date:	Thu, 14 Mar 2013 09:54:17 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Network Development <netdev@...r.kernel.org>
Cc:	e1000-devel@...ts.sourceforge.net
Subject: em1 is visible to iproute2 but not ethtool or tcpdump

My e1000e device is em1.  It has this rather strange behavior on
Fedora's 3.8.1 (although 3.7.something did the same thing, I believe):

$ ip link show dev em1
6: em1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000
    link/ether f0:de:f1:59:f6:c9 brd ff:ff:ff:ff:ff:ff
$ strace -e socket,ioctl ethtool em1
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
Settings for em1:
ioctl(3, SIOCETHTOOL, 0x7fffa6c554d0)   = -1 ENODEV (No such device)
Cannot get device settings: No such device
ioctl(3, SIOCETHTOOL, 0x7fffa6c554d0)   = -1 ENODEV (No such device)
Cannot get wake-on-lan settings: No such device
ioctl(3, SIOCETHTOOL, 0x7fffa6c554d0)   = -1 ENODEV (No such device)
Cannot get message level: No such device
ioctl(3, SIOCETHTOOL, 0x7fffa6c554d0)   = -1 ENODEV (No such device)
Cannot get link status: No such device
No data available
+++ exited with 75 +++
$ sudo tcpdump -i em1
tcpdump: em1: SIOETHTOOL(ETHTOOL_GTSO) ioctl failed: No such device

A sufficient number of rmmod/modprobe cycles will make it work.

This is, perhaps, helpful:

$ sudo ip link set dev em1 name foobar
RTNETLINK answers: Device or resource busy
$ sudo ip link set dev em1 down
$ sudo ip link set dev em1 name foobar
$ sudo ethtool foobar
Settings for foobar:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000007 (7)
			       drv probe link
	Link detected: no
$ sudo ip link set dev foobar name em1
$ sudo ethtool em1
Settings for em1:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Speed: Unknown!
	Duplex: Unknown! (255)
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: pumbg
	Wake-on: g
	Current message level: 0x00000007 (7)
			       drv probe link
	Link detected: no
$

This bug (?) isn't a show-stopper, but it's rather annoying.  I
suspect a core networking bug, not an e1000e bug, but I cc'd the e1000
people just in case.
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