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-rw-r--r--target/linux/generic/pending-5.10/691-net-add-sysfs-attribute-for-enabling-threaded-NAPI.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.10/691-net-add-sysfs-attribute-for-enabling-threaded-NAPI.patch b/target/linux/generic/pending-5.10/691-net-add-sysfs-attribute-for-enabling-threaded-NAPI.patch
new file mode 100644
index 0000000000..279ae2c25a
--- /dev/null
+++ b/target/linux/generic/pending-5.10/691-net-add-sysfs-attribute-for-enabling-threaded-NAPI.patch
@@ -0,0 +1,74 @@
+From: Felix Fietkau <nbd@nbd.name>
+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 <eric.dumazet@gmail.com>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- 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,