From: KY Srinivasan <kys@microsoft.com>
Date: Wed, 30 Apr 2014 17:14:31 +0000 (-0700)
Subject: hyperv: Enable sendbuf mechanism on the send path
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~289
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e;p=pandora-kernel.git

hyperv: Enable sendbuf mechanism on the send path

We send packets using a copy-free mechanism (this is the Guest to Host transport
via VMBUS). While this is obviously optimal for large packets,
it may not be optimal for small packets. Hyper-V host supports
a second mechanism for sending packets that is "copy based". We implement that
mechanism in this patch.

In this version of the patch I have addressed a comment from David Miller.

With this patch (and all of the other offload and VRSS patches), we are now able
to almost saturate a 10G interface between Linux VMs on Hyper-V
on different hosts - close to  9 Gbps as measured via iperf.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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