netdev - Drivers: net: Hyperv

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Date:	Tue, 22 Apr 2014 11:22:13 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	davem@...emloft.net, netdev@...r.kernel.org, olaf@...fle.de,
	jasowang@...hat.com
Subject: Drivers: net: Hyperv 

I am trying to port the various offloads (checksum, TSO etc.) that I recently 
implemented for the Hyper-V network driver to a 2.6.32 kernel and while this
code works on the upstream bits, TCP checksum offload does not seem to work
on the 2.6.32 kernel. Would you know if there is a different way to turn on
checksum offload on 2.6.32 kernels?  I am setting the relevant feature flags:

        net->features =  NETIF_F_SG | NETIF_F_RXCSUM |
                        NETIF_F_IP_CSUM | NETIF_F_TSO;

What I am observing is that when the skb is presented to the driver for transmission,
The ip_summed field in the skb is set to 0.
On the kernel tip, I see this value set to CHECKSUM_PARTIAL and the offloads
work correctly on the kernel tip. The other difference I see is that on entry into the driver,
the eth_hdr state is not correctly set in the skb.
I need to invoke skb_reset_mac_header() to get this state correctly set.
Any help would be greatly appreciated.

Regards,

K. Y

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