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authorWei Wang <weiwan@google.com>2021-02-08 11:34:10 -0800
committerDavid S. Miller <davem@davemloft.net>2021-02-09 15:27:28 -0800
commit5fdd2f0e5c64846bf3066689b73fc3b8dddd1c74 (patch)
treeab2d0435cdb77c248fd654c88521119dec3d10d4 /net/core/net-sysfs.c
parent29863d41bb6e1d969c62fdb15b0961806942960e (diff)
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net: add sysfs attribute to control napi threaded mode
This patch adds a new sysfs attribute to the network device class. Said attribute provides a per-device control to enable/disable the threaded mode for all the napi instances of the given network device, without the need for a device up/down. User sets it to 1 or 0 to enable or disable threaded mode. Note: when switching between threaded and the current softirq based mode for a napi instance, it will not immediately take effect if the napi is currently being polled. The mode switch will happen for the next time napi_schedule() is called. Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Co-developed-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Co-developed-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Wei Wang <weiwan@google.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/net-sysfs.c')
-rw-r--r--net/core/net-sysfs.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 91afb0b6de69..307628fdf380 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -538,6 +538,45 @@ static ssize_t phys_switch_id_show(struct device *dev,
}
static DEVICE_ATTR_RO(phys_switch_id);
+static ssize_t threaded_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct net_device *netdev = to_net_dev(dev);
+ ssize_t ret = -EINVAL;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (dev_isalive(netdev))
+ ret = sprintf(buf, fmt_dec, netdev->threaded);
+
+ rtnl_unlock();
+ return ret;
+}
+
+static int modify_napi_threaded(struct net_device *dev, unsigned long val)
+{
+ int ret;
+
+ if (list_empty(&dev->napi_list))
+ return -EOPNOTSUPP;
+
+ if (val != 0 && val != 1)
+ return -EOPNOTSUPP;
+
+ ret = dev_set_threaded(dev, val);
+
+ return ret;
+}
+
+static ssize_t threaded_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return netdev_store(dev, attr, buf, len, modify_napi_threaded);
+}
+static DEVICE_ATTR_RW(threaded);
+
static struct attribute *net_class_attrs[] __ro_after_init = {
&dev_attr_netdev_group.attr,
&dev_attr_type.attr,
@@ -570,6 +609,7 @@ static struct attribute *net_class_attrs[] __ro_after_init = {
&dev_attr_proto_down.attr,
&dev_attr_carrier_up_count.attr,
&dev_attr_carrier_down_count.attr,
+ &dev_attr_threaded.attr,
NULL,
};
ATTRIBUTE_GROUPS(net_class);