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- From: Felix Fietkau <[email protected]>
- Date: Fri, 21 Aug 2020 15:07:54 +0200
- Subject: [PATCH] net: add sysfs attribute for enabling threaded NAPI
- This can be used to enable threaded NAPI on drivers that did not explicitly
- request it.
- Suggested-by: Eric Dumazet <[email protected]>
- Signed-off-by: Felix Fietkau <[email protected]>
- ---
- --- a/net/core/net-sysfs.c
- +++ b/net/core/net-sysfs.c
- @@ -472,6 +472,52 @@ static ssize_t proto_down_store(struct d
- }
- NETDEVICE_SHOW_RW(proto_down, fmt_dec);
-
- +static int change_napi_threaded(struct net_device *dev, unsigned long val)
- +{
- + struct napi_struct *napi;
- +
- + if (list_empty(&dev->napi_list))
- + return -EOPNOTSUPP;
- +
- + list_for_each_entry(napi, &dev->napi_list, dev_list) {
- + if (val)
- + set_bit(NAPI_STATE_THREADED, &napi->state);
- + else
- + clear_bit(NAPI_STATE_THREADED, &napi->state);
- + }
- +
- + return 0;
- +}
- +
- +static ssize_t napi_threaded_store(struct device *dev,
- + struct device_attribute *attr,
- + const char *buf, size_t len)
- +{
- + return netdev_store(dev, attr, buf, len, change_napi_threaded);
- +}
- +
- +static ssize_t napi_threaded_show(struct device *dev,
- + struct device_attribute *attr,
- + char *buf)
- +{
- + struct net_device *netdev = to_net_dev(dev);
- + struct napi_struct *napi;
- + bool enabled = false;
- +
- + if (!rtnl_trylock())
- + return restart_syscall();
- +
- + list_for_each_entry(napi, &netdev->napi_list, dev_list) {
- + if (test_bit(NAPI_STATE_THREADED, &napi->state))
- + enabled = true;
- + }
- +
- + rtnl_unlock();
- +
- + return sprintf(buf, fmt_dec, enabled);
- +}
- +static DEVICE_ATTR_RW(napi_threaded);
- +
- static ssize_t phys_port_id_show(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- @@ -564,6 +610,7 @@ static struct attribute *net_class_attrs
- &dev_attr_tx_queue_len.attr,
- &dev_attr_gro_flush_timeout.attr,
- &dev_attr_napi_defer_hard_irqs.attr,
- + &dev_attr_napi_threaded.attr,
- &dev_attr_phys_port_id.attr,
- &dev_attr_phys_port_name.attr,
- &dev_attr_phys_switch_id.attr,
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