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Date: Tue, 16 Oct 2012 19:07:13 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Ming Lei <ming.lei@...onical.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Oliver Neukum <oneukum@...e.de>,
Alan Stern <stern@...land.harvard.edu>, netdev@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH] net/core: support runtime PM on net_device
On Wednesday 10 of October 2012 20:58:33 Ming Lei wrote:
> In ioctl path on net_device, the physical deivce is often
> touched, but the physical device may have been put into runtime
> suspend state already, so cause some utilitis(ifconfig, ethtool,
> ...) to return failure in this situation.
>
> This patch enables runtime PM on net_device and mark it as
> no_callbacks, and resumes the net_device if physical device
> is to be accessed, then suspends it after completion of the
> access.
>
> This patch fixes the problem above.
>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
Well, it looks good in principle.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> net/core/dev.c | 83 +++++++++++++++++++++++++++++++-------------------
> net/core/ethtool.c | 9 ++++--
> net/core/net-sysfs.c | 4 +++
> 3 files changed, 63 insertions(+), 33 deletions(-)
>
> diff --git a/net/core/dev.c b/net/core/dev.c
> index de2bad7..d46d4ed 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -135,6 +135,7 @@
> #include <linux/net_tstamp.h>
> #include <linux/static_key.h>
> #include <net/flow_keys.h>
> +#include <linux/pm_runtime.h>
>
> #include "net-sysfs.h"
>
> @@ -4966,39 +4967,24 @@ static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cm
> /*
> * Perform the SIOCxIFxxx calls, inside rtnl_lock()
> */
> -static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
> +static int __dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
> {
> int err;
> struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
> const struct net_device_ops *ops;
>
> - if (!dev)
> - return -ENODEV;
> -
> ops = dev->netdev_ops;
>
> switch (cmd) {
> case SIOCSIFFLAGS: /* Set interface flags */
> return dev_change_flags(dev, ifr->ifr_flags);
>
> - case SIOCSIFMETRIC: /* Set the metric on the interface
> - (currently unused) */
> - return -EOPNOTSUPP;
> -
> case SIOCSIFMTU: /* Set the MTU of a device */
> return dev_set_mtu(dev, ifr->ifr_mtu);
>
> case SIOCSIFHWADDR:
> return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
>
> - case SIOCSIFHWBROADCAST:
> - if (ifr->ifr_hwaddr.sa_family != dev->type)
> - return -EINVAL;
> - memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
> - min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
> - call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
> - return 0;
> -
> case SIOCSIFMAP:
> if (ops->ndo_set_config) {
> if (!netif_device_present(dev))
> @@ -5022,21 +5008,6 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
> if (!netif_device_present(dev))
> return -ENODEV;
> return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
> -
> - case SIOCSIFTXQLEN:
> - if (ifr->ifr_qlen < 0)
> - return -EINVAL;
> - dev->tx_queue_len = ifr->ifr_qlen;
> - return 0;
> -
> - case SIOCSIFNAME:
> - ifr->ifr_newname[IFNAMSIZ-1] = '\0';
> - return dev_change_name(dev, ifr->ifr_newname);
> -
> - case SIOCSHWTSTAMP:
> - err = net_hwtstamp_validate(ifr);
> - if (err)
> - return err;
> /* fall through */
>
> /*
> @@ -5072,6 +5043,56 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
> return err;
> }
>
> +static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
> +{
> + int err;
> + struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
> + const struct net_device_ops *ops;
> +
> + if (!dev)
> + return -ENODEV;
> +
> + ops = dev->netdev_ops;
> +
> + switch (cmd) {
> + case SIOCSIFMETRIC: /* Set the metric on the interface
> + (currently unused) */
> + return -EOPNOTSUPP;
> +
> + case SIOCSIFHWBROADCAST:
> + if (ifr->ifr_hwaddr.sa_family != dev->type)
> + return -EINVAL;
> + memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
> + min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
> + call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
> + return 0;
> +
> + case SIOCSIFTXQLEN:
> + if (ifr->ifr_qlen < 0)
> + return -EINVAL;
> + dev->tx_queue_len = ifr->ifr_qlen;
> + return 0;
> +
> + case SIOCSIFNAME:
> + ifr->ifr_newname[IFNAMSIZ-1] = '\0';
> + return dev_change_name(dev, ifr->ifr_newname);
> +
> + case SIOCSHWTSTAMP:
> + err = net_hwtstamp_validate(ifr);
> + if (err)
> + return err;
> + }
> +
> + if (pm_runtime_get_sync(&dev->dev) < 0)
> + return -ENODEV;
> +
> + err = __dev_ifsioc(net, ifr, cmd);
> +
> + pm_runtime_put(&dev->dev);
> +
> + return err;
> +}
> +
> /*
> * This function handles all "interface"-type I/O control requests. The actual
> * 'doing' part of this is dev_ifsioc above.
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index 4d64cc2..2dc43da 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -25,6 +25,7 @@
> #include <linux/slab.h>
> #include <linux/rtnetlink.h>
> #include <linux/sched.h>
> +#include <linux/pm_runtime.h>
>
> /*
> * Some useful ethtool_ops methods that're device independent.
> @@ -1464,10 +1465,13 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
> return -EPERM;
> }
>
> + if ((ret = pm_runtime_get_sync(&dev->dev)) < 0)
> + return -ENODEV;
> +
> if (dev->ethtool_ops->begin) {
> rc = dev->ethtool_ops->begin(dev);
> if (rc < 0)
> - return rc;
> + goto exit;
> }
> old_features = dev->features;
>
> @@ -1648,6 +1652,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
>
> if (old_features != dev->features)
> netdev_features_change(dev);
> -
> +exit:
> + pm_runtime_put(&dev->dev);
> return rc;
> }
> diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
> index bcf02f6..c9adb89 100644
> --- a/net/core/net-sysfs.c
> +++ b/net/core/net-sysfs.c
> @@ -23,6 +23,7 @@
> #include <linux/export.h>
> #include <linux/jiffies.h>
> #include <net/wext.h>
> +#include <linux/pm_runtime.h>
>
> #include "net-sysfs.h"
>
> @@ -1415,6 +1416,9 @@ int netdev_register_kobject(struct net_device *net)
> if (error)
> return error;
>
> + pm_runtime_no_callbacks(dev);
> + pm_runtime_enable(dev);
> +
> error = register_queue_kobjects(net);
> if (error) {
> device_del(dev);
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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