devlink: create a special NDO for getting the devlink instance

Instead of iterating over all devlink ports add a NDO which
will return the devlink instance from the driver.

v2: add the netdev_to_devlink() helper (Michal)
v3: check that devlink has ops (Florian)
v4: hold devlink_mutex (Jiri)

Suggested-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ffbddd03242bec627f00508ba300d6b9253c35cf..58e83bd7a861a8c10f2738ed19003cb619352a6e 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -941,6 +941,8 @@ struct dev_ifalias {
        char ifalias[];
 };
 
+struct devlink;
+
 /*
  * This structure defines the management hooks for network devices.
  * The following hooks can be defined; unless noted otherwise, they are
@@ -1249,6 +1251,10 @@ struct dev_ifalias {
  *     that got dropped are freed/returned via xdp_return_frame().
  *     Returns negative number, means general error invoking ndo, meaning
  *     no frames were xmit'ed and core-caller will free all frames.
+ * struct devlink *(*ndo_get_devlink)(struct net_device *dev);
+ *     Get devlink instance associated with a given netdev.
+ *     Called with a reference on the netdevice and devlink locks only,
+ *     rtnl_lock is not held.
  */
 struct net_device_ops {
        int                     (*ndo_init)(struct net_device *dev);
@@ -1447,6 +1453,7 @@ struct net_device_ops {
                                                u32 flags);
        int                     (*ndo_xsk_async_xmit)(struct net_device *dev,
                                                      u32 queue_id);
+       struct devlink *        (*ndo_get_devlink)(struct net_device *dev);
 };
 
 /**

diff --git a/include/net/devlink.h b/include/net/devlink.h
index f9f7fe974652b78c333b7899c53ce9ca9d754744..7f5a0bdca22802d05567cbe0faf2b4f97fc07e6b 100644 (file)
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -538,6 +538,15 @@ static inline struct devlink *priv_to_devlink(void *priv)
        return container_of(priv, struct devlink, priv);
 }
 
+static inline struct devlink *netdev_to_devlink(struct net_device *dev)
+{
+#if IS_ENABLED(CONFIG_NET_DEVLINK)
+       if (dev->netdev_ops->ndo_get_devlink)
+               return dev->netdev_ops->ndo_get_devlink(dev);
+#endif
+       return NULL;
+}
+
 struct ib_device;
 
 #if IS_ENABLED(CONFIG_NET_DEVLINK)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 05e04ea0a5c796e94fba28a31da267666af283d4..24bfbd2d71e74bc1122770eb2a831fcd76af56ae 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -6397,9 +6397,6 @@ static void __devlink_compat_running_version(struct devlink *devlink,
        struct sk_buff *msg;
        int rem, err;
 
-       if (!devlink->ops->info_get)
-               return;
-
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
                return;
@@ -6431,55 +6428,36 @@ free_msg:
 void devlink_compat_running_version(struct net_device *dev,
                                    char *buf, size_t len)
 {
-       struct devlink_port *devlink_port;
        struct devlink *devlink;
 
        mutex_lock(&devlink_mutex);
-       list_for_each_entry(devlink, &devlink_list, list) {
-               mutex_lock(&devlink->lock);
-               list_for_each_entry(devlink_port, &devlink->port_list, list) {
-                       if (devlink_port->type == DEVLINK_PORT_TYPE_ETH &&
-                           devlink_port->type_dev == dev) {
-                               __devlink_compat_running_version(devlink,
-                                                                buf, len);
-                               mutex_unlock(&devlink->lock);
-                               goto out;
-                       }
-               }
-               mutex_unlock(&devlink->lock);
-       }
-out:
+       devlink = netdev_to_devlink(dev);
+       if (!devlink || !devlink->ops || !devlink->ops->info_get)
+               goto unlock_list;
+
+       mutex_lock(&devlink->lock);
+       __devlink_compat_running_version(devlink, buf, len);
+       mutex_unlock(&devlink->lock);
+unlock_list:
        mutex_unlock(&devlink_mutex);
 }
 
 int devlink_compat_flash_update(struct net_device *dev, const char *file_name)
 {
-       struct devlink_port *devlink_port;
        struct devlink *devlink;
+       int ret = -EOPNOTSUPP;
 
        mutex_lock(&devlink_mutex);
-       list_for_each_entry(devlink, &devlink_list, list) {
-               mutex_lock(&devlink->lock);
-               list_for_each_entry(devlink_port, &devlink->port_list, list) {
-                       int ret = -EOPNOTSUPP;
-
-                       if (devlink_port->type != DEVLINK_PORT_TYPE_ETH ||
-                           devlink_port->type_dev != dev)
-                               continue;
+       devlink = netdev_to_devlink(dev);
+       if (!devlink || !devlink->ops || !devlink->ops->flash_update)
+               goto unlock_list;
 
-                       mutex_unlock(&devlink_mutex);
-                       if (devlink->ops->flash_update)
-                               ret = devlink->ops->flash_update(devlink,
-                                                                file_name,
-                                                                NULL, NULL);
-                       mutex_unlock(&devlink->lock);
-                       return ret;
-               }
-               mutex_unlock(&devlink->lock);
-       }
+       mutex_lock(&devlink->lock);
+       ret = devlink->ops->flash_update(devlink, file_name, NULL, NULL);
+       mutex_unlock(&devlink->lock);
+unlock_list:
        mutex_unlock(&devlink_mutex);
-
-       return -EOPNOTSUPP;
+       return ret;
 }
 
 static int __init devlink_init(void)