On Sun, 15 Dec 2019 09:11:20 -0800, Stephen Hemminger wrote:

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On Wed, 11 Dec 2019 14:26:27 -0800, Haiyang Zhang wrote:    

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Host can provide send indirection table messages anytime after RSS is
enabled by calling rndis_filter_set_rss_param(). So the host provided
table values may be overwritten by the initialization in
rndis_set_subchannel().

To prevent this problem, move the tx_table initialization before calling
rndis_filter_set_rss_param().

Fixes: a6fb6aa3cfa9 ("hv_netvsc: Set tx_table to equal weight after    

subchannels open")    

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Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>    

Applied, but there are two more problems with this code:
 - you should not reset the indirection table if it was configured by
   the user to something other than the default (use the
   netif_is_rxfh_configured() helper to check for that)    

For Send indirection table (tx_table) ethtool doesn't have the option 
to set it, and it's usually provided by the host. So we always initialize 
it...
But, yes, for Receive indirection table (rx_table), I will make a fix, so 
it will be set to default only for new devices, or changing the number 
of channels; otherwise it will remain the same during operations like 
changing MTU, ringparam.

Thank you!

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 - you should use the ethtool_rxfh_indir_default() wrapper    

For rx_table, we already use it:
                rndis_device->rx_table[i] = ethtool_rxfh_indir_default(
For tx_table, I know it's the same operation (%, mod), but this wrapper 
function's name is for rx_table. Should we use it for tx_table too?
  

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Please fix the former problem in the net tree, and after net is merged
into linux/master and net-next in a week or two please follow up with
the fix for the latter for net-next.    

Sure.

Thanks,
- Haiyang
  

As Haiyang said, this send indirection table is unique to Hyper-V it is not part of
any of the other device models. It is not supported by ethtool. It would not be
appropriate to repurpose the existing indirection tool; the device already uses
the receive indirection table for RSS.

I see, I got confused by the use of the term RSS.