e1000e, 3.4.1, , jumbo frames are not working

[Denys Fedoryshchenko]

Just tried to enable larger mtu on interface, and failed, even i try to 
disable both of mentioned in dmesg offloads.

05:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit 
Ethernet Controller (Copper) (rev 01)
05:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit 
Ethernet Controller (Copper) (rev 01)

L2TP ~ # ethtool -i eth0
driver: e1000e
version: 1.9.5-k
firmware-version: 1.0-0
bus-info: 0000:05:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes

Here is what i did:
ifconfig eth1 mtu 2000
got dmesg:
[ 9160.679354] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be 
enabled when both receive checksum offload and receive hashing are 
enabled.  Disable one of the receive offload features before enabling 
jumbos.

ethtool -K eth1 rxhash off
dmesg:
[ 9194.208856] e1000e 0000:05:00.1: eth1: Reset adapter
[ 9197.295425] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None

Lost connectivity for few seconds, then again i tried to:
ifconfig eth1 mtu 2000

dmesg:
[ 9207.797616] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be 
enabled when both receive checksum offload and receive hashing are 
enabled.  Disable one of the receive offload features before enabling 
jumbos.

ethtool -K eth1 rx off
[ 9222.398034] e1000e 0000:05:00.1: eth1: Reset adapter
[ 9225.497550] e1000e: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: None

Again, tried: ifconfig eth1 mtu 2000
dmesg:
[ 9254.795445] e1000e 0000:05:00.0: eth0: Jumbo frames cannot be 
enabled when both receive checksum offload and receive hashing are 
enabled.  Disable one of the receive offload features before enabling 
jumbos.

L2TP ~ # ethtool -k eth1
Offload parameters for eth1:
rx-checksumming: off
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: off

L2TP ~ # ethtool -d eth1
MAC Registers
-------------
0x00000: CTRL (Device control register)  0x40144241
      Endian mode (buffers):             little
      Link reset:                        normal
      Set link up:                       1
      Invert Loss-Of-Signal:             no
      Receive flow control:              disabled
      Transmit flow control:             disabled
      VLAN mode:                         enabled
      Auto speed detect:                 disabled
      Speed select:                      1000Mb/s
      Force speed:                       no
      Force duplex:                      no
0x00008: STATUS (Device status register) 0x02080787
      Duplex:                            full
      Link up:                           link config
      TBI mode:                          disabled
      Link speed:                        1000Mb/s
      Bus type:                          PCI Express
      Port number:                       1
0x00100: RCTL (Receive control register) 0x04008002
      Receiver:                          enabled
      Store bad packets:                 disabled
      Unicast promiscuous:               disabled
      Multicast promiscuous:             disabled
      Long packet:                       disabled
      Descriptor minimum threshold size: 1/2
      Broadcast accept mode:             accept
      VLAN filter:                       disabled
      Canonical form indicator:          disabled
      Discard pause frames:              filtered
      Pass MAC control frames:           don't pass
      Receive buffer size:               2048
0x02808: RDLEN (Receive desc length)     0x00001000
0x02810: RDH   (Receive desc head)       0x00000046
0x02818: RDT   (Receive desc tail)       0x00000040
0x02820: RDTR  (Receive delay timer)     0x00000020
0x00400: TCTL (Transmit ctrl register)   0x3103F0FA
      Transmitter:                       enabled
      Pad short packets:                 enabled
      Software XOFF Transmission:        disabled
      Re-transmit on late collision:     enabled
0x03808: TDLEN (Transmit desc length)    0x00001000
0x03810: TDH   (Transmit desc head)      0x00000098
0x03818: TDT   (Transmit desc tail)      0x00000099
0x03820: TIDV  (Transmit delay timer)    0x00000008
PHY type:                                unknown


---
Denys Fedoryshchenko, Network Engineer, Virtual ISP S.A.L.
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