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Date: Tue, 27 Aug 2013 18:23:38 +0000
From: "Williams, Mitch A" <mitch.a.williams@...el.com>
To: Ben Hutchings <bhutchings@...arflare.com>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"gospo@...hat.com" <gospo@...hat.com>,
"sassmann@...hat.com" <sassmann@...hat.com>
Subject: RE: [net-next RFC 3/7] i40evf: core ethtool functionality
> -----Original Message-----
> From: Ben Hutchings [mailto:bhutchings@...arflare.com]
> Sent: Tuesday, August 27, 2013 10:28 AM
> To: Kirsher, Jeffrey T
> Cc: davem@...emloft.net; Williams, Mitch A; netdev@...r.kernel.org;
> gospo@...hat.com; sassmann@...hat.com
> Subject: Re: [net-next RFC 3/7] i40evf: core ethtool functionality
>
> On Thu, 2013-08-22 at 21:53 -0700, Jeff Kirsher wrote:
> [...]
> > --- /dev/null
> > +++ b/drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c
> [...]
> > +/**
> > + * i40evf_get_settings - Get Link Speed and Duplex settings
> > + * @netdev: network interface device structure
> > + * @ecmd: ethtool command
> > + *
> > + * Reports speed/duplex settings. Because this is a VF, we don't know
> what
> > + * kind of link we really have, so we fake it.
> > + **/
> > +static int i40evf_get_settings(struct net_device *netdev,
> > + struct ethtool_cmd *ecmd)
> > +{
> > + ecmd->supported = SUPPORTED_10000baseT_Full;
>
> This is silly.
>
> > + ecmd->autoneg = AUTONEG_DISABLE;
> > + ecmd->transceiver = XCVR_DUMMY1;
> > + ecmd->port = -1;
>
> PORT_NONE, I think.
>
> > + return 0;
> > +}
> > +
> > +/**
> > + * i40evf_get_sset_count - Get length of string set
> > + * @netdev: network interface device structure
> > + * @sset: id of string set
> > + *
> > + * Reports size (in bytes) of string set.
>
> Not in bytes.
>
> > This driver only supports
> > + * strings for statistics.
> > + **/
> [...]
> > +/**
> > + * i40evf_get_strings - Get string set
> > + * @netdev: network interface device structure
> > + * @sset: id of string set
> > + * @data: buffer for string data
> > + *
> > + * Strings are concatenated into the data buffer, separated by nulls.
>
> This looks like a description of a Windows-style double-null-terminated
> string list, not an ethtool string set.
>
> > + **/
> > +static void i40evf_get_strings(struct net_device *netdev, u32 sset, u8
> *data)
> > +{
> > + struct i40evf_adapter *adapter = netdev_priv(netdev);
> > + u8 *p = data;
> > + int i;
> > +
> > + if (sset == ETH_SS_STATS) {
> > + for (i = 0; i < I40EVF_GLOBAL_STATS_LEN; i++) {
> > + memcpy(p, i40evf_gstrings_stats[i].stat_string,
> > + ETH_GSTRING_LEN);
> > + p += ETH_GSTRING_LEN;
> > + }
> > + for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
> > + snprintf(p, ETH_GSTRING_LEN, "%s.tx_queue_%u.packets",
> > + netdev->name, i);
> > + p += ETH_GSTRING_LEN;
> > + snprintf(p, ETH_GSTRING_LEN, "%s.tx_queue_%u.bytes",
> > + netdev->name, i);
> > + p += ETH_GSTRING_LEN;
> > + }
> > + for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {
> > + snprintf(p, ETH_GSTRING_LEN, "%s.rx_queue_%u.packets",
> > + netdev->name, i);
> > + p += ETH_GSTRING_LEN;
> > + snprintf(p, ETH_GSTRING_LEN, "%s.rx_queue_%u.bytes",
> > + netdev->name, i);
> > + p += ETH_GSTRING_LEN;
>
> It is completely redundant to put the device name into statistic names,
> and is liable to cause the names to be truncated. There was also a
> discussion about how to name per-queue statistics a while back, which
> seemed to end in agreement:
>
> http://thread.gmane.org/gmane.linux.network/273014/focus=12205
>
> So I think the name formats should be "tx-%u.packets" etc.
>
> [...]
> > +/**
> > + * i40evf_get_drvinto - Get driver info
> > + * @netdev: network interface device structure
> > + * @drvinfo: ethool driver info structure
> > + *
> > + * Returns information about the driver and device for display to the
> user.
> > + **/
> > +static void i40evf_get_drvinfo(struct net_device *netdev,
> > + struct ethtool_drvinfo *drvinfo)
> > +{
> > + struct i40evf_adapter *adapter = netdev_priv(netdev);
> > +
> > + strncpy(drvinfo->driver, i40evf_driver_name, 32);
> > + strncpy(drvinfo->version, i40evf_driver_version, 32);
> > +
> > + strncpy(drvinfo->fw_version, "N/A", 4);
>
> If there is no firmware version then don't set fw_version at all.
>
> > + strncpy(drvinfo->bus_info, pci_name(adapter->pdev), 32);
>
> Use strlcpy() not strncpy() for all of the other strings.
>
> > + drvinfo->n_stats = I40EVF_STATS_LEN;
> > + drvinfo->regdump_len = 0;
>
> Don't set these at all, as they are initialised by the ethtool core
> based on other driver operations.
>
> [...]
> > +static void i40evf_get_ringparam(struct net_device *netdev,
> > + struct ethtool_ringparam *ring)
> > +{
> > + struct i40evf_adapter *adapter = netdev_priv(netdev);
> > + struct i40e_ring *tx_ring = &adapter->tx_rings[0];
> > + struct i40e_ring *rx_ring = &adapter->rx_rings[0];
> > +
> > + ring->rx_max_pending = I40EVF_MAX_RXD;
> > + ring->tx_max_pending = I40EVF_MAX_TXD;
> > + ring->rx_mini_max_pending = 0;
> > + ring->rx_jumbo_max_pending = 0;
> > + ring->rx_pending = rx_ring->count;
> > + ring->tx_pending = tx_ring->count;
> > + ring->rx_mini_pending = 0;
> > + ring->rx_jumbo_pending = 0;
> > +}
>
> No need to set the unsupported fields to 0.
>
> [...]
> > +static int i40evf_get_coalesce(struct net_device *netdev,
> > + struct ethtool_coalesce *ec)
> > +{
> > + struct i40evf_adapter *adapter = netdev_priv(netdev);
> > + struct i40e_vsi *vsi = &adapter->vsi;
> > +
> > + ec->tx_max_coalesced_frames_irq = vsi->work_limit;
> > + ec->rx_max_coalesced_frames_irq = vsi->work_limit;
>
> Use the fields without the '_irq' suffix. The '_irq' suffixed fields
> are there for some NICs that change coalescing behaviour depending on
> whether the previous IRQ is still being handled.
>
> [...]
> > +static int i40evf_set_coalesce(struct net_device *netdev,
> > + struct ethtool_coalesce *ec)
> > +{
> > + struct i40evf_adapter *adapter = netdev_priv(netdev);
> > + struct i40e_hw *hw = &adapter->hw;
> > + struct i40e_vsi *vsi = &adapter->vsi;
> > + struct i40e_q_vector *q_vector;
> > + int i;
> > +
> > + if (ec->tx_max_coalesced_frames_irq || ec->rx_max_coalesced_frames_irq)
> > + vsi->work_limit = ec->tx_max_coalesced_frames_irq;
> [...]
>
> Again, use the fields without the '_irq' suffix.
>
> Ben.
>
Thanks for the review, Ben. I'll fix all of these before we send this out again.
-Mitch
> --
> Ben Hutchings, Staff Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
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