Messages in this thread | | | Date | Thu, 09 Jun 2016 11:43:17 -0700 (PDT) | Subject | Re: [PATCH net-next v3] netvsc: get rid of completion timeouts | From | David Miller <> |
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From: Vitaly Kuznetsov <vkuznets@redhat.com> Date: Thu, 9 Jun 2016 12:44:03 +0200
> I'm hitting 5 second timeout in rndis_filter_set_rss_param() while setting > RSS parameters for the device. When this happens we end up returning > -ETIMEDOUT from the function and rndis_filter_device_add() falls back to > setting > > net_device->max_chn = 1; > net_device->num_chn = 1; > net_device->num_sc_offered = 0; > > but after a moment the rndis request succeeds and subchannels start to > appear. netvsc_sc_open() does unconditional nvscdev->num_sc_offered-- and > it becomes U32_MAX-1. Consequent rndis_filter_device_remove() will hang > while waiting for all U32_MAX-1 subchannels to appear and this is not > going to happen. > > The immediate issue could be solved by adding num_sc_offered > 0 check to > netvsc_sc_open() but we're getting out of sync with the host and it's not > easy to adjust things later, e.g. in this particular case we'll be creating > queues without a user request for it and races are expected. Same applies > to other parts of the driver which have the same completion timeout. > > Following the trend in drivers/hv/* code I suggest we remove all these > timeouts completely. As a guest we can always trust the host we're running > on and if the host screws things up there is no easy way to recover anyway. > > Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> > Acked-by: Haiyang Zhang <haiyangz@microsoft.com>
Applied.
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