From: Andrew Schwartzmeyer <andschwa@microsoft.com>
Date: Wed, 12 Aug 2015 00:14:32 +0000 (-0700)
Subject: hv_netvsc: Implement set_channels ethtool op
X-Git-Tag: omap-for-v4.3/fixes-rc1~110^2~186
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5960e6e2b5c52520cec5888c3feb71b71ba1980;p=pandora-kernel.git

hv_netvsc: Implement set_channels ethtool op

This enables the use of ethtool --set-channels devname combined N to
change the number of vRSS queues. Separate rx, tx, and other parameters
are not supported. The maximum is rsscap.num_recv_que. It passes the
given value to rndis_filter_device_add through the device_info->num_chn
field.

If the procedure fails, it attempts to recover to the prior state. If
the recovery fails, it logs an error and aborts.

Current num_chn is saved and restored when changing the MTU.

Signed-off-by: Andrew Schwartzmeyer <andschwa@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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