devlink: allow driver to update progress of flash update

Introduce a function to be called from drivers during flash. It sends
notification to userspace about flash update progress.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/devlink.h

@@ -741,6 +741,14 @@ void
 devlink_health_reporter_state_update(struct devlink_health_reporter *reporter,
 				     enum devlink_health_reporter_state state);
 
+void devlink_flash_update_begin_notify(struct devlink *devlink);
+void devlink_flash_update_end_notify(struct devlink *devlink);
+void devlink_flash_update_status_notify(struct devlink *devlink,
+					const char *status_msg,
+					const char *component,
+					unsigned long done,
+					unsigned long total);
+
 #if IS_ENABLED(CONFIG_NET_DEVLINK)
 
 void devlink_compat_running_version(struct net_device *dev,

include/uapi/linux/devlink.h

@@ -104,6 +104,8 @@ enum devlink_command {
 	DEVLINK_CMD_HEALTH_REPORTER_DUMP_CLEAR,
 
 	DEVLINK_CMD_FLASH_UPDATE,
+	DEVLINK_CMD_FLASH_UPDATE_END,		/* notification only */
+	DEVLINK_CMD_FLASH_UPDATE_STATUS,	/* notification only */
 
 	/* add new commands above here */
 	__DEVLINK_CMD_MAX,
@@ -331,6 +333,9 @@ enum devlink_attr {
 
 	DEVLINK_ATTR_FLASH_UPDATE_FILE_NAME,	/* string */
 	DEVLINK_ATTR_FLASH_UPDATE_COMPONENT,	/* string */
+	DEVLINK_ATTR_FLASH_UPDATE_STATUS_MSG,	/* string */
+	DEVLINK_ATTR_FLASH_UPDATE_STATUS_DONE,	/* u64 */
+	DEVLINK_ATTR_FLASH_UPDATE_STATUS_TOTAL,	/* u64 */
 
 	/* add new attributes above here, update the policy in devlink.c */
 

net/core/devlink.c

@@ -2673,6 +2673,108 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
 	return devlink->ops->reload(devlink, info->extack);
 }
 
+static int devlink_nl_flash_update_fill(struct sk_buff *msg,
+					struct devlink *devlink,
+					enum devlink_command cmd,
+					const char *status_msg,
+					const char *component,
+					unsigned long done, unsigned long total)
+{
+	void *hdr;
+
+	hdr = genlmsg_put(msg, 0, 0, &devlink_nl_family, 0, cmd);
+	if (!hdr)
+		return -EMSGSIZE;
+
+	if (devlink_nl_put_handle(msg, devlink))
+		goto nla_put_failure;
+
+	if (cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS)
+		goto out;
+
+	if (status_msg &&
+	    nla_put_string(msg, DEVLINK_ATTR_FLASH_UPDATE_STATUS_MSG,
+			   status_msg))
+		goto nla_put_failure;
+	if (component &&
+	    nla_put_string(msg, DEVLINK_ATTR_FLASH_UPDATE_COMPONENT,
+			   component))
+		goto nla_put_failure;
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_FLASH_UPDATE_STATUS_DONE,
+			      done, DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_FLASH_UPDATE_STATUS_TOTAL,
+			      total, DEVLINK_ATTR_PAD))
+		goto nla_put_failure;
+
+out:
+	genlmsg_end(msg, hdr);
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+static void __devlink_flash_update_notify(struct devlink *devlink,
+					  enum devlink_command cmd,
+					  const char *status_msg,
+					  const char *component,
+					  unsigned long done,
+					  unsigned long total)
+{
+	struct sk_buff *msg;
+	int err;
+
+	WARN_ON(cmd != DEVLINK_CMD_FLASH_UPDATE &&
+		cmd != DEVLINK_CMD_FLASH_UPDATE_END &&
+		cmd != DEVLINK_CMD_FLASH_UPDATE_STATUS);
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return;
+
+	err = devlink_nl_flash_update_fill(msg, devlink, cmd, status_msg,
+					   component, done, total);
+	if (err)
+		goto out_free_msg;
+
+	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
+				msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
+	return;
+
+out_free_msg:
+	nlmsg_free(msg);
+}
+
+void devlink_flash_update_begin_notify(struct devlink *devlink)
+{
+	__devlink_flash_update_notify(devlink,
+				      DEVLINK_CMD_FLASH_UPDATE,
+				      NULL, NULL, 0, 0);
+}
+EXPORT_SYMBOL_GPL(devlink_flash_update_begin_notify);
+
+void devlink_flash_update_end_notify(struct devlink *devlink)
+{
+	__devlink_flash_update_notify(devlink,
+				      DEVLINK_CMD_FLASH_UPDATE_END,
+				      NULL, NULL, 0, 0);
+}
+EXPORT_SYMBOL_GPL(devlink_flash_update_end_notify);
+
+void devlink_flash_update_status_notify(struct devlink *devlink,
+					const char *status_msg,
+					const char *component,
+					unsigned long done,
+					unsigned long total)
+{
+	__devlink_flash_update_notify(devlink,
+				      DEVLINK_CMD_FLASH_UPDATE_STATUS,
+				      status_msg, component, done, total);
+}
+EXPORT_SYMBOL_GPL(devlink_flash_update_status_notify);
+
 static int devlink_nl_cmd_flash_update(struct sk_buff *skb,
 				       struct genl_info *info)
 {