[OpenWrt-Devel] [PATCH] netifd: Support for configurable default packet steering

[Hans Dedecker]

Default packet steering behavior can be configured via the parameter force_ps
in the global section; the default value is true to keep backwards compatibility.
Device packet steering (rps/xps) config can still be used to override the
default behavior.
This allows you to disable packet steering for all devices without the need
to define a device config list which disables receive/transmit packet steering

Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 config.c |  6 ++++++
 device.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 device.h |  3 +++
 3 files changed, 58 insertions(+), 7 deletions(-)

diff --git a/config.c b/config.c
index 48c4fbf..77ebb45 100644
--- a/config.c
+++ b/config.c
@@ -306,6 +306,12 @@ config_init_globals(void)
 	const char *ula_prefix = uci_lookup_option_string(
 			uci_ctx, globals, "ula_prefix");
 	interface_ip_set_ula_prefix(ula_prefix);
+
+	const char *force_ps = uci_lookup_option_string(
+			uci_ctx, globals, "force_ps");
+
+	if (force_ps)
+		device_set_force_ps(strcmp(force_ps, "1") ? false : true);
 }
 
 static void
diff --git a/device.c b/device.c
index 092c2d9..afe917c 100644
--- a/device.c
+++ b/device.c
@@ -29,6 +29,7 @@
 #include "config.h"
 
 static struct avl_tree devices;
+static bool force_ps = true;
 
 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
 	[DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
@@ -244,15 +245,19 @@ device_init_settings(struct device *dev, struct blob_attr **tb)
 		s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 	}
 
-	if ((cur = tb[DEV_ATTR_RPS]))
+	if ((cur = tb[DEV_ATTR_RPS])) {
 		s->rps = blobmsg_get_bool(cur);
+		s->flags |= DEV_OPT_RPS;
+	}
 	else
-		s->rps = true;
+		s->rps = force_ps;
 
-	if ((cur = tb[DEV_ATTR_XPS]))
+	if ((cur = tb[DEV_ATTR_XPS])) {
 		s->xps = blobmsg_get_bool(cur);
+		s->flags |= DEV_OPT_XPS;
+	}
 	else
-		s->xps = true;
+		s->xps = force_ps;
 
 	device_set_disabled(dev, disabled);
 }
@@ -370,8 +375,8 @@ int device_init(struct device *dev, const struct device_type *type, const char *
 
 	system_if_clear_state(dev);
 	device_check_state(dev);
-	dev->settings.rps = true;
-	dev->settings.xps = true;
+	dev->settings.rps = force_ps;
+	dev->settings.xps = force_ps;
 
 	return 0;
 }
@@ -723,6 +728,41 @@ device_reset_old(void)
 	}
 }
 
+void
+device_set_force_ps(bool state)
+{
+	struct device *dev;
+
+	if (state == force_ps)
+		return;
+
+	force_ps = state;
+
+	avl_for_each_element(&devices, dev, avl) {
+		struct device_settings *s = &dev->settings;
+		unsigned int apply_mask = 0;
+
+		if (!(s->flags & DEV_OPT_RPS)) {
+			s->rps = force_ps;
+			apply_mask |= DEV_OPT_RPS;
+		}
+
+		if (!(s->flags & DEV_OPT_XPS)) {
+			s->xps = force_ps;
+			apply_mask |= DEV_OPT_XPS;
+		}
+
+		if (!apply_mask)
+			continue;
+
+		if (!(dev->external || (dev->present && dev->active)) ||
+				dev->config_pending)
+			continue;
+
+		system_if_apply_settings(dev, s, apply_mask);
+	}
+}
+
 struct device *
 device_create(const char *name, const struct device_type *type,
 	      struct blob_attr *config)
@@ -758,8 +798,10 @@ device_create(const char *name, const struct device_type *type,
 	if (odev)
 		device_replace(dev, odev);
 
-	if (!config_init && dev->config_pending)
+	if (!config_init && dev->config_pending) {
 		type->config_init(dev);
+		dev->config_pending = false;
+	}
 
 	return dev;
 }
diff --git a/device.h b/device.h
index 753e1fa..d80142b 100644
--- a/device.h
+++ b/device.h
@@ -78,6 +78,8 @@ enum {
 	DEV_OPT_IGMPVERSION		= (1 << 7),
 	DEV_OPT_MLDVERSION		= (1 << 8),
 	DEV_OPT_NEIGHREACHABLETIME	= (1 << 9),
+	DEV_OPT_RPS			= (1 << 10),
+	DEV_OPT_XPS			= (1 << 11),
 };
 
 /* events broadcasted to all users of a device */
@@ -206,6 +208,7 @@ device_apply_config(struct device *dev, const struct device_type *type,
 
 void device_reset_config(void);
 void device_reset_old(void);
+void device_set_force_ps(bool state);
 
 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name);
 int device_init(struct device *iface, const struct device_type *type, const char *ifname);
-- 
1.9.1
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