1. 13 10月, 2016 2 次提交
  2. 24 9月, 2016 1 次提交
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  10. 09 7月, 2016 1 次提交
  11. 10 6月, 2016 1 次提交
    • V
      netvsc: get rid of completion timeouts · 5362855a
      Vitaly Kuznetsov 提交于
      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: NVitaly Kuznetsov <vkuznets@redhat.com>
      Acked-by: NHaiyang Zhang <haiyangz@microsoft.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5362855a
  12. 06 6月, 2016 4 次提交