[Intel-wired-lan] [net] ixgbe: fix older devices that do not support IXGBE_MRQC_L3L4TXSWEN

[Xuguizhu (Guzhu Xu, Intelligent Computing Business Dept)]

Hi guys:
	We would like to know what kind of issues this patch may cause before it is modified, or what triggers you to make this change. How can we reproduce this issue in the lab? The cards we can find in our lab are 82599, X540 and X550. Please guide us to verify this issue, thank you very much. After comparing the data sheets of the 82599 and X550, we found that the L3L4TXSWEN bit in the 82599 NIC is reserved, but this flag is writable.

-----邮件原件-----
发件人: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] 代表 Bowers, AndrewX
发送时间: 2019年1月31日 3:40
收件人: intel-wired-lan at lists.osuosl.org
主题: Re: [Intel-wired-lan] [net] ixgbe: fix older devices that do not support IXGBE_MRQC_L3L4TXSWEN

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On 
> Behalf Of Jeff Kirsher
> Sent: Monday, January 28, 2019 9:45 AM
> To: intel-wired-lan at lists.osuosl.org
> Subject: [Intel-wired-lan] [net] ixgbe: fix older devices that do not 
> support IXGBE_MRQC_L3L4TXSWEN
> 
> The enabling L3/L4 filtering for transmit switched packets for all 
> devices caused unforeseen issue on older devices when trying to send 
> UDP traffic in an ordered sequence.  This bit was originally intended 
> for X550 devices, which supported this feature, so limit the scope of 
> this bit to only X550 devices.
> 
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

Tested-by: Andrew Bowers <andrewx.bowers at intel.com>


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