RE: RXFH manual configuration

-----Original Message-----
From: Tariq Toukan [mailto:tariqt@mellanox.com]
Sent: Sunday, June 18, 2017 1:32 AM
To: Keller, Jacob E <jacob.e.keller@intel.com>
Cc: Linux Kernel Network Developers <redacted>; Saeed
Mahameed [off-list ref]; Eran Ben Elisha
[off-list ref]
Subject: RXFH manual configuration

Hi Jacob,

I am looking at your patch:
d4ab4286276f ethtool: correctly ensure {GS}CHANNELS doesn't conflict ...

I wonder - if I want to configure the number of channels (ethtool -L),
without being aware to the history of indirection table (manually set or
not), how can I know what is the expected behavior?
I should be able, from userspace, to query the value of
netif_is_rxfh_configured() in order to decide whether the outcome of an
ethtool -L command is correct or not.

Do you know if this indication exists?

Thanks,
Tariq

Hi,

I believe you can check the flags value, from /sys/class/net/<device>/flags, though you'll have to manually parse that. I don't think iproute2 suite shows this flag, but i suspect it could be modified to do so. Specifically you check for IFF_RXFH_CONFIGURED

Thanks,
Jake