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