swconfig: add API for setting port link speed

Some switches can force link speed for a port. Let's add API that will
allow drivers to export this feature.

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

SVN-Revision: 48142

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

@@ -127,6 +127,16 @@ swconfig_get_pvid(struct switch_dev *dev, const struct switch_attr *attr,
 	return dev->ops->get_port_pvid(dev, val->port_vlan, &val->value.i);
 }
 
+static int
+swconfig_set_link(struct switch_dev *dev, const struct switch_attr *attr,
+			struct switch_val *val)
+{
+	if (!dev->ops->set_port_link)
+		return -EOPNOTSUPP;
+
+	return dev->ops->set_port_link(dev, val->port_vlan, val->value.link);
+}
+
 static int
 swconfig_get_link(struct switch_dev *dev, const struct switch_attr *attr,
 			struct switch_val *val)
@@ -206,7 +216,7 @@ static struct switch_attr default_port[] = {
 		.type = SWITCH_TYPE_LINK,
 		.name = "link",
 		.description = "Get port link information",
-		.set = NULL,
+		.set = swconfig_set_link,
 		.get = swconfig_get_link,
 	}
 };
@@ -282,6 +292,12 @@ static const struct nla_policy port_policy[SWITCH_PORT_ATTR_MAX+1] = {
 	[SWITCH_PORT_FLAG_TAGGED] = { .type = NLA_FLAG },
 };
 
+static struct nla_policy link_policy[SWITCH_LINK_ATTR_MAX] = {
+	[SWITCH_LINK_FLAG_DUPLEX] = { .type = NLA_FLAG },
+	[SWITCH_LINK_FLAG_ANEG] = { .type = NLA_FLAG },
+	[SWITCH_LINK_SPEED] = { .type = NLA_U32 },
+};
+
 static inline void
 swconfig_lock(void)
 {
@@ -594,6 +610,22 @@ swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 	return 0;
 }
 
+static int
+swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
+		    struct switch_port_link *link)
+{
+	struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
+
+	if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy))
+		return -EINVAL;
+
+	link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
+	link->aneg = !!tb[SWITCH_LINK_FLAG_ANEG];
+	link->speed = nla_get_u32(tb[SWITCH_LINK_SPEED]);
+
+	return 0;
+}
+
 static int
 swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 {
@@ -644,6 +676,21 @@ swconfig_set_attr(struct sk_buff *skb, struct genl_info *info)
 			err = 0;
 		}
 		break;
+	case SWITCH_TYPE_LINK:
+		val.value.link = &dev->linkbuf;
+		memset(&dev->linkbuf, 0, sizeof(struct switch_port_link));
+
+		if (info->attrs[SWITCH_ATTR_OP_VALUE_LINK]) {
+			err = swconfig_parse_link(skb,
+						  info->attrs[SWITCH_ATTR_OP_VALUE_LINK],
+						  val.value.link);
+			if (err < 0)
+				goto error;
+		} else {
+			val.len = 0;
+			err = 0;
+		}
+		break;
 	default:
 		goto error;
 	}

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

@@ -95,6 +95,8 @@ struct switch_dev_ops {
 
 	int (*get_port_link)(struct switch_dev *dev, int port,
 			     struct switch_port_link *link);
+	int (*set_port_link)(struct switch_dev *dev, int port,
+			     struct switch_port_link *link);
 	int (*get_port_stats)(struct switch_dev *dev, int port,
 			      struct switch_port_stats *stats);
 };