swconfig: add SWITCH_TYPE_LINK and support sending link info to user space

So far we were sending link data as a string. It got some drawbacks:
1) Didn't allow writing clean user space apps reading link state. It was
   needed to do some screen scraping.
2) Forced whole PORT_LINK communication to be string based. Adding
   support for *setting* port link required passing string and parting
   it in the kernel space.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 47997

target/linux/generic/files/drivers/net/phy/swconfig.c

@@ -770,6 +770,53 @@ done:
 	return err;
 }
 
+static int
+swconfig_send_link(struct sk_buff *msg, struct genl_info *info, int attr,
+		   const struct switch_port_link *link)
+{
+	struct nlattr *p = NULL;
+	int err = 0;
+
+	p = nla_nest_start(msg, attr);
+	if (link->link) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_LINK))
+			goto nla_put_failure;
+	}
+	if (link->duplex) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_DUPLEX))
+			goto nla_put_failure;
+	}
+	if (link->aneg) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_ANEG))
+			goto nla_put_failure;
+	}
+	if (link->tx_flow) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_TX_FLOW))
+			goto nla_put_failure;
+	}
+	if (link->rx_flow) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_RX_FLOW))
+			goto nla_put_failure;
+	}
+	if (nla_put_u32(msg, SWITCH_LINK_SPEED, link->speed))
+		goto nla_put_failure;
+	if (link->eee & ADVERTISED_100baseT_Full) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_100BASET))
+			goto nla_put_failure;
+	}
+	if (link->eee & ADVERTISED_1000baseT_Full) {
+		if (nla_put_flag(msg, SWITCH_LINK_FLAG_EEE_1000BASET))
+			goto nla_put_failure;
+	}
+	nla_nest_end(msg, p);
+
+	return err;
+
+nla_put_failure:
+	nla_nest_cancel(msg, p);
+	return -1;
+}
+
 static int
 swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 {
@@ -794,6 +841,9 @@ swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 		val.value.ports = dev->portbuf;
 		memset(dev->portbuf, 0,
 			sizeof(struct switch_port) * dev->ports);
+	} else if (attr->type == SWITCH_TYPE_LINK) {
+		val.value.link = &dev->linkbuf;
+		memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
 	}
 
 	err = attr->get(dev, attr, &val);
@@ -824,6 +874,12 @@ swconfig_get_attr(struct sk_buff *skb, struct genl_info *info)
 		if (err < 0)
 			goto nla_put_failure;
 		break;
+	case SWITCH_TYPE_LINK:
+		err = swconfig_send_link(msg, info,
+					 SWITCH_ATTR_OP_VALUE_LINK, val.value.link);
+		if (err < 0)
+			goto nla_put_failure;
+		break;
 	default:
 		pr_debug("invalid type in attribute\n");
 		err = -EINVAL;

target/linux/generic/files/include/linux/switch.h

@@ -122,6 +122,7 @@ struct switch_dev {
 	struct mutex sw_mutex;
 	struct switch_port *portbuf;
 	struct switch_portmap *portmap;
+	struct switch_port_link linkbuf;
 
 	char buf[128];
 
@@ -148,6 +149,7 @@ struct switch_val {
 		const char *s;
 		u32 i;
 		struct switch_port *ports;
+		struct switch_port_link *link;
 	} value;
 };
 

target/linux/generic/files/include/uapi/linux/switch.h

@@ -50,6 +50,7 @@ enum {
 	SWITCH_ATTR_OP_VALUE_INT,
 	SWITCH_ATTR_OP_VALUE_STR,
 	SWITCH_ATTR_OP_VALUE_PORTS,
+	SWITCH_ATTR_OP_VALUE_LINK,
 	SWITCH_ATTR_OP_DESCRIPTION,
 	/* port lists */
 	SWITCH_ATTR_PORT,
@@ -86,6 +87,7 @@ enum switch_val_type {
 	SWITCH_TYPE_INT,
 	SWITCH_TYPE_STRING,
 	SWITCH_TYPE_PORTS,
+	SWITCH_TYPE_LINK,
 	SWITCH_TYPE_NOVAL,
 };
 
@@ -97,6 +99,20 @@ enum {
 	SWITCH_PORT_ATTR_MAX
 };
 
+/* link nested attributes */
+enum {
+	SWITCH_LINK_UNSPEC,
+	SWITCH_LINK_FLAG_LINK,
+	SWITCH_LINK_FLAG_DUPLEX,
+	SWITCH_LINK_FLAG_ANEG,
+	SWITCH_LINK_FLAG_TX_FLOW,
+	SWITCH_LINK_FLAG_RX_FLOW,
+	SWITCH_LINK_SPEED,
+	SWITCH_LINK_FLAG_EEE_100BASET,
+	SWITCH_LINK_FLAG_EEE_1000BASET,
+	SWITCH_LINK_ATTR_MAX,
+};
+
 #define SWITCH_ATTR_DEFAULTS_OFFSET	0x1000