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-rw-r--r--include/linux/netdevice.h20
-rw-r--r--include/uapi/linux/if_link.h1
-rw-r--r--net/core/dev.c18
-rw-r--r--net/core/net-sysfs.c22
-rw-r--r--net/core/rtnetlink.c25
5 files changed, 85 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3ca60b070ef0..875f869dc38a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -728,6 +728,16 @@ struct netdev_fcoe_hbainfo {
};
#endif
+#define MAX_PHYS_PORT_ID_LEN 32
+
+/* This structure holds a unique identifier to identify the
+ * physical port used by a netdevice.
+ */
+struct netdev_phys_port_id {
+ unsigned char id[MAX_PHYS_PORT_ID_LEN];
+ unsigned char id_len;
+};
+
/*
* This structure defines the management hooks for network devices.
* The following hooks can be defined; unless noted otherwise, they are
@@ -932,6 +942,12 @@ struct netdev_fcoe_hbainfo {
* that determine carrier state from physical hardware properties (eg
* network cables) or protocol-dependent mechanisms (eg
* USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
+ *
+ * int (*ndo_get_phys_port_id)(struct net_device *dev,
+ * struct netdev_phys_port_id *ppid);
+ * Called to get ID of physical port of this device. If driver does
+ * not implement this, it is assumed that the hw is not able to have
+ * multiple net devices on single physical port.
*/
struct net_device_ops {
int (*ndo_init)(struct net_device *dev);
@@ -1060,6 +1076,8 @@ struct net_device_ops {
struct nlmsghdr *nlh);
int (*ndo_change_carrier)(struct net_device *dev,
bool new_carrier);
+ int (*ndo_get_phys_port_id)(struct net_device *dev,
+ struct netdev_phys_port_id *ppid);
};
/*
@@ -2315,6 +2333,8 @@ extern int dev_set_mac_address(struct net_device *,
struct sockaddr *);
extern int dev_change_carrier(struct net_device *,
bool new_carrier);
+extern int dev_get_phys_port_id(struct net_device *dev,
+ struct netdev_phys_port_id *ppid);
extern int dev_hard_start_xmit(struct sk_buff *skb,
struct net_device *dev,
struct netdev_queue *txq);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 03f6170ab337..04c0e7a5d484 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -143,6 +143,7 @@ enum {
IFLA_NUM_TX_QUEUES,
IFLA_NUM_RX_QUEUES,
IFLA_CARRIER,
+ IFLA_PHYS_PORT_ID,
__IFLA_MAX
};
diff --git a/net/core/dev.c b/net/core/dev.c
index dfd9f5d56ae0..58eb802584b9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4989,6 +4989,24 @@ int dev_change_carrier(struct net_device *dev, bool new_carrier)
EXPORT_SYMBOL(dev_change_carrier);
/**
+ * dev_get_phys_port_id - Get device physical port ID
+ * @dev: device
+ * @ppid: port ID
+ *
+ * Get device physical port ID
+ */
+int dev_get_phys_port_id(struct net_device *dev,
+ struct netdev_phys_port_id *ppid)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ if (!ops->ndo_get_phys_port_id)
+ return -EOPNOTSUPP;
+ return ops->ndo_get_phys_port_id(dev, ppid);
+}
+EXPORT_SYMBOL(dev_get_phys_port_id);
+
+/**
* dev_new_index - allocate an ifindex
* @net: the applicable net namespace
*
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 981fed397d1d..8826b0d1e0cc 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -334,6 +334,27 @@ static ssize_t store_group(struct device *dev, struct device_attribute *attr,
return netdev_store(dev, attr, buf, len, change_group);
}
+static ssize_t show_phys_port_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct net_device *netdev = to_net_dev(dev);
+ ssize_t ret = -EINVAL;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (dev_isalive(netdev)) {
+ struct netdev_phys_port_id ppid;
+
+ ret = dev_get_phys_port_id(netdev, &ppid);
+ if (!ret)
+ ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
+ }
+ rtnl_unlock();
+
+ return ret;
+}
+
static struct device_attribute net_class_attributes[] = {
__ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
@@ -355,6 +376,7 @@ static struct device_attribute net_class_attributes[] = {
__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
store_tx_queue_len),
__ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
+ __ATTR(phys_port_id, S_IRUGO, show_phys_port_id, NULL),
{}
};
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 3de740834d1f..0b2972c59b97 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -767,7 +767,8 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
+ rtnl_vfinfo_size(dev, ext_filter_mask) /* IFLA_VFINFO_LIST */
+ rtnl_port_size(dev) /* IFLA_VF_PORTS + IFLA_PORT_SELF */
+ rtnl_link_get_size(dev) /* IFLA_LINKINFO */
- + rtnl_link_get_af_size(dev); /* IFLA_AF_SPEC */
+ + rtnl_link_get_af_size(dev) /* IFLA_AF_SPEC */
+ + nla_total_size(MAX_PHYS_PORT_ID_LEN); /* IFLA_PHYS_PORT_ID */
}
static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
@@ -846,6 +847,24 @@ static int rtnl_port_fill(struct sk_buff *skb, struct net_device *dev)
return 0;
}
+static int rtnl_phys_port_id_fill(struct sk_buff *skb, struct net_device *dev)
+{
+ int err;
+ struct netdev_phys_port_id ppid;
+
+ err = dev_get_phys_port_id(dev, &ppid);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ if (nla_put(skb, IFLA_PHYS_PORT_ID, ppid.id_len, ppid.id))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
int type, u32 pid, u32 seq, u32 change,
unsigned int flags, u32 ext_filter_mask)
@@ -913,6 +932,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
goto nla_put_failure;
}
+ if (rtnl_phys_port_id_fill(skb, dev))
+ goto nla_put_failure;
+
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
if (attr == NULL)
@@ -1113,6 +1135,7 @@ const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_PROMISCUITY] = { .type = NLA_U32 },
[IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
[IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
+ [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
};
EXPORT_SYMBOL(ifla_policy);
generated by cgit v1.2.3 (git 2.46.0) at 2025-07-29 01:38:39 +0000