Merge tag 'batadv-next-pullrequest-20230816' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This cleanup patchset includes the following patches:

 - bump version strings, by Simon Wunderlich

 - Remove unused declarations, by Yue Haibing

 - Clean up MTU handling, by Sven Eckelmann (2 patches)

 - Clean up/remove (obsolete) functions, by Sven Eckelmann (3 patches)

* tag 'batadv-next-pullrequest-20230816' of git://git.open-mesh.org/linux-merge:
  batman-adv: Drop per algo GW section class code
  batman-adv: Keep batadv_netlink_notify_* static
  batman-adv: Drop unused function batadv_gw_bandwidth_set
  batman-adv: Check hardif MTU against runtime MTU
  batman-adv: Avoid magic value for minimum MTU
  batman-adv: Remove unused declarations
  batman-adv: Start new development cycle
====================

Link: https://lore.kernel.org/r/20230816164000.190884-1-sw@simonwunderlich.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/batman-adv/bat_iv_ogm.c

@@ -2516,6 +2516,7 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
 	},
 	.gw = {
 		.init_sel_class = batadv_iv_init_sel_class,
+		.sel_class_max = BATADV_TQ_MAX_VALUE,
 		.get_best_gw_node = batadv_iv_gw_get_best_gw_node,
 		.is_eligible = batadv_iv_gw_is_eligible,
 		.dump = batadv_iv_gw_dump,

net/batman-adv/bat_v.c

@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/jiffies.h>
 #include <linux/kref.h>
+#include <linux/limits.h>
 #include <linux/list.h>
 #include <linux/minmax.h>
 #include <linux/netdevice.h>
@@ -34,7 +35,6 @@
 #include "bat_v_elp.h"
 #include "bat_v_ogm.h"
 #include "gateway_client.h"
-#include "gateway_common.h"
 #include "hard-interface.h"
 #include "hash.h"
 #include "log.h"
@@ -512,25 +512,6 @@ static void batadv_v_init_sel_class(struct batadv_priv *bat_priv)
 	atomic_set(&bat_priv->gw.sel_class, 50);
 }
 
-static ssize_t batadv_v_store_sel_class(struct batadv_priv *bat_priv,
-					char *buff, size_t count)
-{
-	u32 old_class, class;
-
-	if (!batadv_parse_throughput(bat_priv->soft_iface, buff,
-				     "B.A.T.M.A.N. V GW selection class",
-				     &class))
-		return -EINVAL;
-
-	old_class = atomic_read(&bat_priv->gw.sel_class);
-	atomic_set(&bat_priv->gw.sel_class, class);
-
-	if (old_class != class)
-		batadv_gw_reselect(bat_priv);
-
-	return count;
-}
-
 /**
  * batadv_v_gw_throughput_get() - retrieve the GW-bandwidth for a given GW
  * @gw_node: the GW to retrieve the metric for
@@ -818,7 +799,7 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = {
 	},
 	.gw = {
 		.init_sel_class = batadv_v_init_sel_class,
-		.store_sel_class = batadv_v_store_sel_class,
+		.sel_class_max = U32_MAX,
 		.get_best_gw_node = batadv_v_gw_get_best_gw_node,
 		.is_eligible = batadv_v_gw_is_eligible,
 		.dump = batadv_v_gw_dump,

net/batman-adv/gateway_common.c

@@ -9,123 +9,14 @@
 
 #include <linux/atomic.h>
 #include <linux/byteorder/generic.h>
-#include <linux/errno.h>
-#include <linux/kstrtox.h>
-#include <linux/limits.h>
-#include <linux/math64.h>
-#include <linux/netdevice.h>
 #include <linux/stddef.h>
-#include <linux/string.h>
+#include <linux/types.h>
 #include <uapi/linux/batadv_packet.h>
 #include <uapi/linux/batman_adv.h>
 
 #include "gateway_client.h"
-#include "log.h"
 #include "tvlv.h"
 
-/**
- * batadv_parse_throughput() - parse supplied string buffer to extract
- *  throughput information
- * @net_dev: the soft interface net device
- * @buff: string buffer to parse
- * @description: text shown when throughput string cannot be parsed
- * @throughput: pointer holding the returned throughput information
- *
- * Return: false on parse error and true otherwise.
- */
-bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
-			     const char *description, u32 *throughput)
-{
-	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
-	u64 lthroughput;
-	char *tmp_ptr;
-	int ret;
-
-	if (strlen(buff) > 4) {
-		tmp_ptr = buff + strlen(buff) - 4;
-
-		if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
-			bw_unit_type = BATADV_BW_UNIT_MBIT;
-
-		if (strncasecmp(tmp_ptr, "kbit", 4) == 0 ||
-		    bw_unit_type == BATADV_BW_UNIT_MBIT)
-			*tmp_ptr = '\0';
-	}
-
-	ret = kstrtou64(buff, 10, &lthroughput);
-	if (ret) {
-		batadv_err(net_dev,
-			   "Invalid throughput speed for %s: %s\n",
-			   description, buff);
-		return false;
-	}
-
-	switch (bw_unit_type) {
-	case BATADV_BW_UNIT_MBIT:
-		/* prevent overflow */
-		if (U64_MAX / 10 < lthroughput) {
-			batadv_err(net_dev,
-				   "Throughput speed for %s too large: %s\n",
-				   description, buff);
-			return false;
-		}
-
-		lthroughput *= 10;
-		break;
-	case BATADV_BW_UNIT_KBIT:
-	default:
-		lthroughput = div_u64(lthroughput, 100);
-		break;
-	}
-
-	if (lthroughput > U32_MAX) {
-		batadv_err(net_dev,
-			   "Throughput speed for %s too large: %s\n",
-			   description, buff);
-		return false;
-	}
-
-	*throughput = lthroughput;
-
-	return true;
-}
-
-/**
- * batadv_parse_gw_bandwidth() - parse supplied string buffer to extract
- *  download and upload bandwidth information
- * @net_dev: the soft interface net device
- * @buff: string buffer to parse
- * @down: pointer holding the returned download bandwidth information
- * @up: pointer holding the returned upload bandwidth information
- *
- * Return: false on parse error and true otherwise.
- */
-static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
-				      u32 *down, u32 *up)
-{
-	char *slash_ptr;
-	bool ret;
-
-	slash_ptr = strchr(buff, '/');
-	if (slash_ptr)
-		*slash_ptr = 0;
-
-	ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
-				      down);
-	if (!ret)
-		return false;
-
-	/* we also got some upload info */
-	if (slash_ptr) {
-		ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
-					      "upload gateway speed", up);
-		if (!ret)
-			return false;
-	}
-
-	return true;
-}
-
 /**
  * batadv_gw_tvlv_container_update() - update the gw tvlv container after
  *  gateway setting change
@@ -155,57 +46,6 @@ void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
 	}
 }
 
-/**
- * batadv_gw_bandwidth_set() - Parse and set download/upload gateway bandwidth
- *  from supplied string buffer
- * @net_dev: netdev struct of the soft interface
- * @buff: the buffer containing the user data
- * @count: number of bytes in the buffer
- *
- * Return: 'count' on success or a negative error code in case of failure
- */
-ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
-				size_t count)
-{
-	struct batadv_priv *bat_priv = netdev_priv(net_dev);
-	u32 down_curr;
-	u32 up_curr;
-	u32 down_new = 0;
-	u32 up_new = 0;
-	bool ret;
-
-	down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
-	up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
-
-	ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
-	if (!ret)
-		return -EINVAL;
-
-	if (!down_new)
-		down_new = 1;
-
-	if (!up_new)
-		up_new = down_new / 5;
-
-	if (!up_new)
-		up_new = 1;
-
-	if (down_curr == down_new && up_curr == up_new)
-		return count;
-
-	batadv_gw_reselect(bat_priv);
-	batadv_info(net_dev,
-		    "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
-		    down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
-		    down_new / 10, down_new % 10, up_new / 10, up_new % 10);
-
-	atomic_set(&bat_priv->gw.bandwidth_down, down_new);
-	atomic_set(&bat_priv->gw.bandwidth_up, up_new);
-	batadv_gw_tvlv_container_update(bat_priv);
-
-	return count;
-}
-
 /**
  * batadv_gw_tvlv_ogm_handler_v1() - process incoming gateway tvlv container
  * @bat_priv: the bat priv with all the soft interface information

net/batman-adv/gateway_common.h

@@ -9,9 +9,6 @@
 
 #include "main.h"
 
-#include <linux/netdevice.h>
-#include <linux/types.h>
-
 /**
  * enum batadv_bandwidth_units - bandwidth unit types
  */
@@ -27,12 +24,8 @@ enum batadv_bandwidth_units {
 #define BATADV_GW_MODE_CLIENT_NAME	"client"
 #define BATADV_GW_MODE_SERVER_NAME	"server"
 
-ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
-				size_t count);
 void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv);
 void batadv_gw_init(struct batadv_priv *bat_priv);
 void batadv_gw_free(struct batadv_priv *bat_priv);
-bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
-			     const char *description, u32 *throughput);
 
 #endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */

net/batman-adv/hard-interface.c

@@ -9,6 +9,7 @@
 
 #include <linux/atomic.h>
 #include <linux/byteorder/generic.h>
+#include <linux/compiler.h>
 #include <linux/container_of.h>
 #include <linux/errno.h>
 #include <linux/gfp.h>
@@ -699,9 +700,14 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	struct batadv_priv *bat_priv;
 	__be16 ethertype = htons(ETH_P_BATMAN);
 	int max_header_len = batadv_max_header_len();
+	unsigned int required_mtu;
+	unsigned int hardif_mtu;
 	int ret;
 
-	if (hard_iface->net_dev->mtu < ETH_MIN_MTU + max_header_len)
+	hardif_mtu = READ_ONCE(hard_iface->net_dev->mtu);
+	required_mtu = READ_ONCE(soft_iface->mtu) + max_header_len;
+
+	if (hardif_mtu < ETH_MIN_MTU + max_header_len)
 		return -EINVAL;
 
 	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
@@ -734,18 +740,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 		    hard_iface->net_dev->name);
 
 	if (atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
+	    hardif_mtu < required_mtu)
 		batadv_info(hard_iface->soft_iface,
 			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
-			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + max_header_len);
+			    hard_iface->net_dev->name, hardif_mtu,
+			    required_mtu);
 
 	if (!atomic_read(&bat_priv->fragmentation) &&
-	    hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
+	    hardif_mtu < required_mtu)
 		batadv_info(hard_iface->soft_iface,
 			    "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
-			    hard_iface->net_dev->name, hard_iface->net_dev->mtu,
-			    ETH_DATA_LEN + max_header_len);
+			    hard_iface->net_dev->name, hardif_mtu,
+			    required_mtu);
 
 	if (batadv_hardif_is_iface_up(hard_iface))
 		batadv_hardif_activate_interface(hard_iface);

net/batman-adv/main.h

@@ -13,7 +13,7 @@
 #define BATADV_DRIVER_DEVICE "batman-adv"
 
 #ifndef BATADV_SOURCE_VERSION
-#define BATADV_SOURCE_VERSION "2023.1"
+#define BATADV_SOURCE_VERSION "2023.3"
 #endif
 
 /* B.A.T.M.A.N. parameters */

net/batman-adv/netlink.c

@@ -377,7 +377,7 @@ static int batadv_netlink_mesh_fill(struct sk_buff *msg,
  *
  * Return: 0 on success, < 0 on error
  */
-int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
+static int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv)
 {
 	struct sk_buff *msg;
 	int ret;
@@ -548,15 +548,12 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
 		 * algorithm in use implements the GW API
 		 */
 
-		u32 sel_class_max = 0xffffffffu;
+		u32 sel_class_max = bat_priv->algo_ops->gw.sel_class_max;
 		u32 sel_class;
 
 		attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
 		sel_class = nla_get_u32(attr);
 
-		if (!bat_priv->algo_ops->gw.store_sel_class)
-			sel_class_max = BATADV_TQ_MAX_VALUE;
-
 		if (sel_class >= 1 && sel_class <= sel_class_max) {
 			atomic_set(&bat_priv->gw.sel_class, sel_class);
 			batadv_gw_reselect(bat_priv);
@@ -858,7 +855,7 @@ static int batadv_netlink_hardif_fill(struct sk_buff *msg,
  *
  * Return: 0 on success, < 0 on error
  */
-int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
+static int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
 					struct batadv_hard_iface *hard_iface)
 {
 	struct sk_buff *msg;
@@ -1073,7 +1070,7 @@ static int batadv_netlink_vlan_fill(struct sk_buff *msg,
  *
  * Return: 0 on success, < 0 on error
  */
-int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
+static int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
 				      struct batadv_softif_vlan *vlan)
 {
 	struct sk_buff *msg;

net/batman-adv/netlink.h

@@ -21,12 +21,6 @@ int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
 				  u8 result, u32 test_time, u64 total_bytes,
 				  u32 cookie);
 
-int batadv_netlink_notify_mesh(struct batadv_priv *bat_priv);
-int batadv_netlink_notify_hardif(struct batadv_priv *bat_priv,
-				 struct batadv_hard_iface *hard_iface);
-int batadv_netlink_notify_vlan(struct batadv_priv *bat_priv,
-			       struct batadv_softif_vlan *vlan);
-
 extern struct genl_family batadv_netlink_family;
 
 #endif /* _NET_BATMAN_ADV_NETLINK_H_ */

net/batman-adv/routing.h

@@ -27,10 +27,6 @@ int batadv_recv_frag_packet(struct sk_buff *skb,
 			    struct batadv_hard_iface *iface);
 int batadv_recv_bcast_packet(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
-int batadv_recv_tt_query(struct sk_buff *skb,
-			 struct batadv_hard_iface *recv_if);
-int batadv_recv_roam_adv(struct sk_buff *skb,
-			 struct batadv_hard_iface *recv_if);
 int batadv_recv_unicast_tvlv(struct sk_buff *skb,
 			     struct batadv_hard_iface *recv_if);
 int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,

net/batman-adv/soft-interface.c

@@ -154,7 +154,7 @@ static int batadv_interface_set_mac_addr(struct net_device *dev, void *p)
 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
 {
 	/* check ranges */
-	if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev))
+	if (new_mtu < ETH_MIN_MTU || new_mtu > batadv_hardif_min_mtu(dev))
 		return -EINVAL;
 
 	dev->mtu = new_mtu;

net/batman-adv/types.h

@@ -2191,11 +2191,10 @@ struct batadv_algo_gw_ops {
 	void (*init_sel_class)(struct batadv_priv *bat_priv);
 
 	/**
-	 * @store_sel_class: parse and stores a new GW selection class
-	 *  (optional)
+	 * @sel_class_max: maximum allowed GW selection class
 	 */
-	ssize_t (*store_sel_class)(struct batadv_priv *bat_priv, char *buff,
-				   size_t count);
+	u32 sel_class_max;
+
 	/**
 	 * @get_best_gw_node: select the best GW from the list of available
 	 *  nodes (optional)