[RFC V3 PATCH 03/26] net/netpolicy: get device queue irq information

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxx>

Net policy needs to know device information. Currently, it's enough to
only get irq information of rx and tx queues.

This patch introduces ndo ops to do so, not ethtool ops.
Because there are already several ways to get irq information in
userspace. It's not necessory to extend the ethtool.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
 include/linux/netdevice.h |  5 +++++
 include/linux/netpolicy.h |  7 +++++++
 net/core/netpolicy.c      | 14 ++++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 876293d..e1b5685 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1125,6 +1125,9 @@ struct netdev_xdp {
  * int(*ndo_netpolicy_init)(struct net_device *dev,
  *			    struct netpolicy_info *info);
  *	This function is used to init and get supported policy.
+ * int (*ndo_get_irq_info)(struct net_device *dev,
+ *			   struct netpolicy_dev_info *info);
+ *	This function is used to get irq information of rx and tx queues
  *
  */
 struct net_device_ops {
@@ -1314,6 +1317,8 @@ struct net_device_ops {
 #ifdef CONFIG_NETPOLICY
 	int			(*ndo_netpolicy_init)(struct net_device *dev,
 						      struct netpolicy_info *info);
+	int			(*ndo_get_irq_info)(struct net_device *dev,
+						    struct netpolicy_dev_info *info);
 #endif /* CONFIG_NETPOLICY */
 };
 
diff --git a/include/linux/netpolicy.h b/include/linux/netpolicy.h
index ca1f131..fc87d9b 100644
--- a/include/linux/netpolicy.h
+++ b/include/linux/netpolicy.h
@@ -23,6 +23,13 @@ enum netpolicy_name {
 
 extern const char *policy_name[];
 
+struct netpolicy_dev_info {
+	u32	rx_num;
+	u32	tx_num;
+	u32	*rx_irq;
+	u32	*tx_irq;
+};
+
 struct netpolicy_info {
 	enum netpolicy_name	cur_policy;
 	unsigned long avail_policy[BITS_TO_LONGS(NET_POLICY_MAX)];
diff --git a/net/core/netpolicy.c b/net/core/netpolicy.c
index c1c0dc0..882f0de 100644
--- a/net/core/netpolicy.c
+++ b/net/core/netpolicy.c
@@ -36,6 +36,20 @@
 #include <net/net_namespace.h>
 #include <net/rtnetlink.h>
 
+static int netpolicy_get_dev_info(struct net_device *dev,
+				  struct netpolicy_dev_info *d_info)
+{
+	if (!dev->netdev_ops->ndo_get_irq_info)
+		return -ENOTSUPP;
+	return dev->netdev_ops->ndo_get_irq_info(dev, d_info);
+}
+
+static void netpolicy_free_dev_info(struct netpolicy_dev_info *d_info)
+{
+	kfree(d_info->rx_irq);
+	kfree(d_info->tx_irq);
+}
+
 const char *policy_name[NET_POLICY_MAX] = {
 	"NONE"
 };
-- 
2.5.5