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Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for get_coalesce, set_coalesce ethtool operations

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for get_coalesce, set_coalesce ethtool operations
Date 2016-05-07 19:50 +0200
Message-ID <rwewy-5Wi-1@gated-at.bofh.it> (permalink)
References <rvXcl-6kA-5@gated-at.bofh.it> <rvXcl-6kA-9@gated-at.bofh.it> <rw9dv-1ix-9@gated-at.bofh.it>
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From: Ben Hutchings <ben@decadent.org.uk>
Date: Sat, 07 May 2016 13:04:46 +0100

> On Fri, 2016-05-06 at 16:12 -0700, Shrikrishna Khare wrote:
> [...]
>> +static int
>> +vmxnet3_set_coalesce(struct net_device *netdev, struct ethtool_coalesce *ec)
>> +{
> [...]
>> +	switch (ec->rx_coalesce_usecs) {
>> +	case VMXNET3_COALESCE_DEFAULT:
>> +	case VMXNET3_COALESCE_DISABLED:
>> +	case VMXNET3_COALESCE_ADAPT:
>> +		if (ec->tx_max_coalesced_frames ||
>> +		    ec->tx_max_coalesced_frames_irq ||
>> +		    ec->rx_max_coalesced_frames_irq) {
>> +			return -EINVAL;
>> +		}
>> +		memset(adapter->coal_conf, 0, sizeof(*adapter->coal_conf));
>> +		adapter->coal_conf->coalMode = ec->rx_coalesce_usecs;
>> +		break;
>> +	case VMXNET3_COALESCE_STATIC:
> [...]
> 
> I don't want to see drivers introducing magic values for fields that
> are denominated in microseconds (especially not for 0, which is the
> correct way to specify 'no coalescing').  If the current
> ethtool_coalesce structure is inadequate, propose an extension.

Agreed.

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[PATCH net-next 5/7] Driver: Vmxnet3: Add support for get_coalesce, set_coalesce ethtool operations Shrikrishna Khare <skhare@vmware.com> - 2016-05-07 01:20 +0200
  Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for  get_coalesce, set_coalesce ethtool operations Ben Hutchings <ben@decadent.org.uk> - 2016-05-07 14:10 +0200
    Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for  get_coalesce, set_coalesce ethtool operations David Miller <davem@davemloft.net> - 2016-05-07 19:50 +0200
    Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for get_coalesce,  set_coalesce ethtool operations Shrikrishna Khare <skhare@vmware.com> - 2016-05-08 23:00 +0200
      Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for  get_coalesce, set_coalesce ethtool operations Ben Hutchings <ben@decadent.org.uk> - 2016-05-09 02:20 +0200
        RE: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for  get_coalesce, set_coalesce ethtool operations David Laight <David.Laight@ACULAB.COM> - 2016-05-10 13:30 +0200
          Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for  get_coalesce, set_coalesce ethtool operations Ben Hutchings <ben@decadent.org.uk> - 2016-05-10 14:10 +0200

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