hv_netvsc: preserve hw_features on mtu/channels/ringparam changes

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[ Commit aefd80e874 upstream. ]

rndis_filter_device_add() is called both from netvsc_probe() when we
initially create the device and from set channels/mtu/ringparam
routines where we basically remove the device and add it back.

hw_features is reset in rndis_filter_device_add() and filled with
host data. However, we lose all additional flags which are set outside
of the driver, e.g. register_netdevice() adds NETIF_F_SOFT_FEATURES and
many others.

Unfortunately, calls to rndis_{query_hwcaps(), _set_offload_params()}
calls cannot be avoided on every RNDIS reset: host expects us to set
required features explicitly. Moreover, in theory hardware capabilities
can change and we need to reflect the change in hw_features.

Reset net->hw_features bits according to host data in
rndis_netdev_set_hwcaps(), clear corresponding feature bits
from net->features in case some features went missing (will never happen
in real life I guess but let's be consistent).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Vitaly Kuznetsov 2018-05-14 15:32:06 -07:00 • committed by Greg Kroah-Hartman

parent 284a58c02e

commit 41f24dbef1

3 changed files with 83 additions and 59 deletions

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4

drivers/net/hyperv/hyperv_net.h

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2

drivers/net/hyperv/netvsc_drv.c

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136

drivers/net/hyperv/rndis_filter.c

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