linux-kernel - Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for get_coalesce, set

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Message-ID: <1462622686.19332.33.camel@decadent.org.uk>
Date:	Sat, 07 May 2016 13:04:46 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Shrikrishna Khare <skhare@...are.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, pv-drivers@...are.com
Cc:	Keyong Sun <sunk@...are.com>, Manoj Tammali <tammalim@...are.com>
Subject: Re: [PATCH net-next 5/7] Driver: Vmxnet3: Add support for
 get_coalesce, set_coalesce ethtool operations

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.

Ben.

-- 
Ben Hutchings
Editing code like this is akin to sticking plasters on the bleeding stump
of a severed limb. - me, 29 June 1999
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