> From: Gangfeng Huang [gangfeng.hu...@ni.com]
> Sent: Wednesday, October 28, 2015 6:47 PM
> To: e1000-devel@lists.sourceforge.net
> Subject: [E1000-devel] [PATCH net-next 1/2] igb: add function to set I210
> transmit mode
>
> I210 supports two transmit modes, legacy and Qav. The transmit mode is
> configured in TQAVCTRL.QavMode register. Before this patch igb driver
> only support legacy mode. This patch makes it possible to configure the
> transmit mode.
Should the i211 (largely similar part) support this as well?
>
> Example:
> Get the transmit mode:
> $ echo /sys/class/net/eth0/qav_mode
I think you mean "$ cat /sys/class/net/eth0/qav_mode
> 0
> Set transmit mode to qav mode
> $ echo 1 > /sys/class/net/eth0/qav_mode
>
> Tested:
> Setting /sys/class/net/eth0/qav_mode to Qav mode,
> 1) Switch back and forth between Qav mode and legacy mode
> 2) Send/recv packets in both mode.
> Signed-off-by: Gangfeng Huang <gangfeng.hu...@ni.com>
> ---
> drivers/net/ethernet/intel/igb/e1000_defines.h | 21 +++
> drivers/net/ethernet/intel/igb/e1000_regs.h | 7 +
> drivers/net/ethernet/intel/igb/igb.h | 5 +
> drivers/net/ethernet/intel/igb/igb_main.c | 182
> +++++++++++++++++++++++-
> 4 files changed, 213 insertions(+), 2 deletions(-)
> <snip>
> ...
> #define MAXIMUM_ETHERNET_VLAN_SIZE 1522
I notice that if I enable qav_mode I am unable to set the MTU beyond 1514,
however there does not seem to be any check to either keep qav_mode from being
enabled on larger MTUs or to change the MTU to a lower size if qav_mode is
enabled on a system with jumbo frames:
----------------------------
u1485:[0]/root> cat /sys/class/net/eth3/qav_mode
1
u1485:[0]/root> ifconfig eth3|grep MTU
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
u1485:[0]/root> ifconfig eth3 mtu 9000
SIOCSIFMTU: Invalid argument
u1485:[0]/root> echo 0 > /sys/class/net/eth3/qav_mode
u1485:[0]/root> ifconfig eth3 mtu 9000
u1485:[0]/root> echo 1 > /sys/class/net/eth3/qav_mode
u1485:[0]/root> ifconfig eth3|grep MTU
UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
u1485:[0]/root> cat /sys/class/net/eth3/qav_mode
1
u1485:[0]/root>
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