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Date: Wed, 09 Dec 2009 17:57:14 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Greg Rose <gregory.v.rose@...el.com>,
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [RFC PATCH 10/12] ixgbevf: Driver main and ethool interface
module and main header
I had a look at the ethtool part of this:
On Tue, 2009-12-08 at 14:16 -0800, Jeff Kirsher wrote:
[...]
> +#ifdef SIOCETHTOOL
What?!
> +#include <linux/uaccess.h>
> +
> +#include "ixgbevf.h"
> +
> +#ifndef ETH_GSTRING_LEN
> +#define ETH_GSTRING_LEN 32
> +#endif
You can omit most of these #ifdefs in the in-tree driver.
[...]
> +static int ixgbevf_get_settings(struct net_device *netdev,
> + struct ethtool_cmd *ecmd)
> +{
> + struct ixgbevf_adapter *adapter = netdev_priv(netdev);
> + struct ixgbe_hw *hw = &adapter->hw;
> + u32 link_speed = 0;
> + bool link_up;
> +
> + ecmd->supported = SUPPORTED_10000baseT_Full;
Not likely...
> + ecmd->autoneg = AUTONEG_DISABLE;
> + ecmd->transceiver = XCVR_DUMMY1;
> + ecmd->port = -1;
> +
> + if (!in_interrupt()) {
This is bogus; get_settings() must be called in process context with
rtnl_lock held. (If this is a workaround for the old bonding driver
locking bugs, it doesn't belong in an in-tree driver.)
> + hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
> + } else {
> + /*
> + * this is a special workaround for cases where bonding
> + * calls this routine from interrupt context
> + */
> + link_speed = adapter->link_speed;
> + link_up = adapter->link_up;
> + }
> +
> + if (link_up) {
> + ecmd->speed = (link_speed == IXGBE_LINK_SPEED_10GB_FULL) ?
> + SPEED_10000 : SPEED_1000;
> + ecmd->duplex = DUPLEX_FULL;
> + } else {
> + ecmd->speed = -1;
> + ecmd->duplex = -1;
> + }
> +
> + return 0;
> +}
> +
> +static int ixgbevf_set_settings(struct net_device *netdev,
> + struct ethtool_cmd *ecmd)
> +{
> + return -EINVAL;
> +}
Should be -EOPNOTSUPP; the settings may or may not be valid. In fact,
you should just not fill in the set_settings operation.
[...]
> +static u32 ixgbevf_get_tx_csum(struct net_device *netdev)
> +{
> + return (netdev->features & NETIF_F_IP_CSUM) != 0;
> +}
This is redundant; the default implementation does the right thing.
> +static int ixgbevf_set_tx_csum(struct net_device *netdev, u32 data)
> +{
> + if (data)
> +#ifdef NETIF_F_IPV6_CSUM
> + netdev->features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
> + else
> + netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
> +#else
> + netdev->features |= NETIF_F_IP_CSUM;
> + else
> + netdev->features &= ~NETIF_F_IP_CSUM;
> +#endif
> +
> + return 0;
> +}
Use ethtool_op_set_tx_ipv6_csum.
> +#undef ethtool_op_set_tso
> +#ifdef NETIF_F_TSO
> +static int ixgbevf_set_tso(struct net_device *netdev, u32 data)
> +{
> +#ifndef HAVE_NETDEV_VLAN_FEATURES
> + struct ixgbevf_adapter *adapter = netdev_priv(netdev);
> +#endif /* HAVE_NETDEV_VLAN_FEATURES */
> + if (data) {
> + netdev->features |= NETIF_F_TSO;
> +#ifdef NETIF_F_TSO6
> + netdev->features |= NETIF_F_TSO6;
> +#endif
> + } else {
> + netif_tx_stop_all_queues(netdev);
> + netdev->features &= ~NETIF_F_TSO;
> +#ifdef NETIF_F_TSO6
> + netdev->features &= ~NETIF_F_TSO6;
> +#endif
> +#ifndef HAVE_NETDEV_VLAN_FEATURES
> +#ifdef NETIF_F_HW_VLAN_TX
> + /* disable TSO on all VLANs if they're present */
> + if (adapter->vlgrp) {
> + int i;
> + struct net_device *v_netdev;
> + for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
> + v_netdev =
> + vlan_group_get_device(adapter->vlgrp, i);
> + if (v_netdev) {
> + v_netdev->features &= ~NETIF_F_TSO;
> +#ifdef NETIF_F_TSO6
> + v_netdev->features &= ~NETIF_F_TSO6;
> +#endif
> + vlan_group_set_device(adapter->vlgrp, i,
> + v_netdev);
> + }
> + }
> + }
> +#endif
> +#endif /* HAVE_NETDEV_VLAN_FEATURES */
> + netif_tx_start_all_queues(netdev);
> + }
> + return 0;
> +}
> +#endif /* NETIF_F_TSO */
Ew.
[...]
> +static int ixgbevf_get_regs_len(struct net_device *netdev)
> +{
> +#define IXGBE_REGS_LEN 45
> + return IXGBE_REGS_LEN * sizeof(u32);
> +}
> +
> +#define IXGBE_GET_STAT(_A_, _R_) (_A_->stats._R_)
> +
> +static char *ixgbevf_reg_names[] = {
> + "IXGBE_VFCTRL",
> + "IXGBE_VFSTATUS",
[...]
If you move ixgbevf_get_regs_len() after ixgbevf_reg_names() you can
then use ARRAY_SIZE() instead of having to keep IXGBE_REGS_LEN in sync
manually.
> +static int ixgbevf_get_eeprom(struct net_device *netdev,
> + struct ethtool_eeprom *eeprom, u8 *bytes)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static int ixgbevf_set_eeprom(struct net_device *netdev,
> + struct ethtool_eeprom *eeprom, u8 *bytes)
> +{
> + return -EOPNOTSUPP;
> +}
Just don't fill in the operations.
> +static void ixgbevf_get_drvinfo(struct net_device *netdev,
> + struct ethtool_drvinfo *drvinfo)
> +{
> + struct ixgbevf_adapter *adapter = netdev_priv(netdev);
> +
> + strncpy(drvinfo->driver, ixgbevf_driver_name, 32);
> + strncpy(drvinfo->version, ixgbevf_driver_version, 32);
> +
> + strncpy(drvinfo->fw_version, "N/A", 4);
> + strncpy(drvinfo->bus_info, pci_name(adapter->pdev), 32);
These are expected to be null-terminated, so use strlcpy().
> + drvinfo->n_stats = IXGBEVF_STATS_LEN;
> + drvinfo->testinfo_len = IXGBE_TEST_LEN;
> + drvinfo->regdump_len = ixgbevf_get_regs_len(netdev);
The ethtool core initialises these.
[...]
> +static int ixgbevf_link_test(struct ixgbevf_adapter *adapter, u64
> *data)
> +{
> + struct ixgbe_hw *hw = &adapter->hw;
> + bool link_up;
> + u32 link_speed = 0;
> + *data = 0;
> +
> + hw->mac.ops.check_link(hw, &link_speed, &link_up, true);
> + if (link_up)
> + return *data;
> + else
> + *data = 1;
> + return *data;
This is just messy.
[...]
> +static u32 ixgbevf_get_link(struct net_device *dev)
> +{
> + return netif_carrier_ok(dev) ? 1 : 0;
> +}
[...]
Use ethtool_op_get_link().
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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