netdev - bnx2: can't disable rx-vlan-offload?

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Message-ID: <DUB123-W35654C3B747AEBC067DAF8EDAD0@phx.gbl>
Date:	Tue, 14 Oct 2014 18:05:28 +0200
From:	Lukas Tribus <luky-37@...mail.com>
To:	Sony Chacko <sony.chacko@...gic.com>,
	"Dept-HSGLinuxNICDev@...gic.com" <dept-hsglinuxnicdev@...gic.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: bnx2: can't disable rx-vlan-offload?

Hi!


For a passive, libpcap based sniffer I'm trying to disable rx vlan
offload on a bnx2 card (vlan capture filter in libpcap doesn't work
correctly), but I'm not able to:

disabling rxvlan fails:

root@...ffer:~# ethtool -K eth1 rxvlan off
Could not change any device features
root@...ffer:~#
root@...ffer:~# ethtool -k eth1
Features for eth1:
rx-checksumming: on
tx-checksumming: on
        tx-checksum-ipv4: on
        tx-checksum-ip-generic: off [fixed]
        tx-checksum-ipv6: on
        tx-checksum-fcoe-crc: off [fixed]
        tx-checksum-sctp: off [fixed]
scatter-gather: on
        tx-scatter-gather: on
        tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
        tx-tcp-segmentation: on
        tx-tcp-ecn-segmentation: on
        tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on [requested off]
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-ipip-segmentation: off [fixed]
tx-sit-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
root@...ffer:~#
root@...ffer:~# ethtool -i eth1
driver: bnx2
version: 2.2.4
firmware-version: 5.0.9 bc 5.0.6 NCSI 2.0.3
bus-info: 0000:01:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no
root@...ffer:~#

dmesg bnx2 lines:
[    6.974972] bnx2: Broadcom NetXtreme II Gigabit Ethernet Driver bnx2 v2.2.4 (Aug 05, 2013)
[    6.975681] bnx2 0000:01:00.0 eth0: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem da000000, IRQ 36, node addr 00:26:b9:51:ba:59
[    6.976631] bnx2 0000:01:00.1 eth1: Broadcom NetXtreme II BCM5716 1000Base-T (C0) PCI Express found at mem dc000000, IRQ 48, node addr 00:26:b9:51:ba:5a


I'm using Ubuntus 3.13 kernel and ethtool version 3.13, but I previously
tried ethtool 3.1 on both ubuntu 3.8 kernel and a vanilla 3.14.21
kernel as well.


Any ideas or workarounds that may help disabling rx vlan acceleration?




Thanks!

Lukas


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