#define __ro_after_init
#endif /* < KERNEL_VERSION(4, 10, 0) */
+
+/* <DECLARE_EWMA> */
+
+#include <linux/version.h>
+#include_next <linux/average.h>
+
+#include <linux/bug.h>
+
+#ifdef DECLARE_EWMA
+#undef DECLARE_EWMA
+#endif /* DECLARE_EWMA */
+
+/*
+ * Exponentially weighted moving average (EWMA)
+ *
+ * This implements a fixed-precision EWMA algorithm, with both the
+ * precision and fall-off coefficient determined at compile-time
+ * and built into the generated helper funtions.
+ *
+ * The first argument to the macro is the name that will be used
+ * for the struct and helper functions.
+ *
+ * The second argument, the precision, expresses how many bits are
+ * used for the fractional part of the fixed-precision values.
+ *
+ * The third argument, the weight reciprocal, determines how the
+ * new values will be weighed vs. the old state, new values will
+ * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
+ * that this parameter must be a power of two for efficiency.
+ */
+
+#define DECLARE_EWMA(name, _precision, _weight_rcp) \
+ struct ewma_##name { \
+ unsigned long internal; \
+ }; \
+ static inline void ewma_##name##_init(struct ewma_##name *e) \
+ { \
+ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
+ /* \
+ * Even if you want to feed it just 0/1 you should have \
+ * some bits for the non-fractional part... \
+ */ \
+ BUILD_BUG_ON((_precision) > 30); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
+ e->internal = 0; \
+ } \
+ static inline unsigned long \
+ ewma_##name##_read(struct ewma_##name *e) \
+ { \
+ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
+ BUILD_BUG_ON((_precision) > 30); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
+ return e->internal >> (_precision); \
+ } \
+ static inline void ewma_##name##_add(struct ewma_##name *e, \
+ unsigned long val) \
+ { \
+ unsigned long internal = ACCESS_ONCE(e->internal); \
+ unsigned long weight_rcp = ilog2(_weight_rcp); \
+ unsigned long precision = _precision; \
+ \
+ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
+ BUILD_BUG_ON((_precision) > 30); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
+ \
+ ACCESS_ONCE(e->internal) = internal ? \
+ (((internal << weight_rcp) - internal) + \
+ (val << precision)) >> weight_rcp : \
+ (val << precision); \
+ }
+
+/* </DECLARE_EWMA> */
--- /dev/null
+From: Johannes Berg <johannes.berg@intel.com>
+Date: Wed, 15 Feb 2017 09:49:26 +0100
+Subject: [PATCH] batman-adv: average: change to declare precision, not factor
+
+Declaring the factor is counter-intuitive, and people are prone
+to using small(-ish) values even when that makes no sense.
+
+Change the DECLARE_EWMA() macro to take the fractional precision,
+in bits, rather than a factor, and update all users.
+
+While at it, add some more documentation.
+
+Acked-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+[sven@narfation.org: Added compatibility code]
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+---
+ compat-include/linux/average.h | 67 +++++++++++++++++++++++++++---------------
+ net/batman-adv/types.h | 2 +-
+ 2 files changed, 45 insertions(+), 24 deletions(-)
+
+diff --git a/compat-include/linux/average.h b/compat-include/linux/average.h
+index ec022cb6..a1e3c254 100644
+--- a/compat-include/linux/average.h
++++ b/compat-include/linux/average.h
+@@ -26,49 +26,70 @@
+
+ #include <linux/bug.h>
+
+-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 3, 0)
++#undef DECLARE_EWMA
++#endif /* < KERNEL_VERSION(4, 3, 0) */
+
+-/* Exponentially weighted moving average (EWMA) */
++/*
++ * Exponentially weighted moving average (EWMA)
++ *
++ * This implements a fixed-precision EWMA algorithm, with both the
++ * precision and fall-off coefficient determined at compile-time
++ * and built into the generated helper funtions.
++ *
++ * The first argument to the macro is the name that will be used
++ * for the struct and helper functions.
++ *
++ * The second argument, the precision, expresses how many bits are
++ * used for the fractional part of the fixed-precision values.
++ *
++ * The third argument, the weight reciprocal, determines how the
++ * new values will be weighed vs. the old state, new values will
++ * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
++ * that this parameter must be a power of two for efficiency.
++ */
+
+-#define DECLARE_EWMA(name, _factor, _weight) \
++#define DECLARE_EWMA(name, _precision, _weight_rcp) \
+ struct ewma_##name { \
+ unsigned long internal; \
+ }; \
+ static inline void ewma_##name##_init(struct ewma_##name *e) \
+ { \
+- BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+- BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
++ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
++ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
++ /* \
++ * Even if you want to feed it just 0/1 you should have \
++ * some bits for the non-fractional part... \
++ */ \
++ BUILD_BUG_ON((_precision) > 30); \
++ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
+ e->internal = 0; \
+ } \
+ static inline unsigned long \
+ ewma_##name##_read(struct ewma_##name *e) \
+ { \
+- BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+- BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
+- return e->internal >> ilog2(_factor); \
++ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
++ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
++ BUILD_BUG_ON((_precision) > 30); \
++ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
++ return e->internal >> (_precision); \
+ } \
+ static inline void ewma_##name##_add(struct ewma_##name *e, \
+ unsigned long val) \
+ { \
+ unsigned long internal = ACCESS_ONCE(e->internal); \
+- unsigned long weight = ilog2(_weight); \
+- unsigned long factor = ilog2(_factor); \
++ unsigned long weight_rcp = ilog2(_weight_rcp); \
++ unsigned long precision = _precision; \
+ \
+- BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+- BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+- BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
++ BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
++ BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
++ BUILD_BUG_ON((_precision) > 30); \
++ BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
+ \
+ ACCESS_ONCE(e->internal) = internal ? \
+- (((internal << weight) - internal) + \
+- (val << factor)) >> weight : \
+- (val << factor); \
++ (((internal << weight_rcp) - internal) + \
++ (val << precision)) >> weight_rcp : \
++ (val << precision); \
+ }
+
+-#endif /* < KERNEL_VERSION(4, 3, 0) */
+-
+ #endif /* _NET_BATMAN_ADV_COMPAT_LINUX_AVERAGE_H */
+diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
+index 8f64a5c0..66b25e41 100644
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -402,7 +402,7 @@ struct batadv_gw_node {
+ struct rcu_head rcu;
+ };
+
+-DECLARE_EWMA(throughput, 1024, 8)
++DECLARE_EWMA(throughput, 10, 8)
+
+ /**
+ * struct batadv_hardif_neigh_node_bat_v - B.A.T.M.A.N. V private neighbor
--- /dev/null
+From: Sven Eckelmann <sven@narfation.org>
+Date: Wed, 22 Feb 2017 17:25:42 +0100
+Subject: [PATCH] batman-adv: Keep fragments equally sized
+
+The batman-adv fragmentation packets have the design problem that they
+cannot be refragmented and cannot handle padding by the underlying link.
+The latter often leads to problems when networks are incorrectly configured
+and don't use a common MTU.
+
+The sender could for example fragment a 1271 byte frame (plus external
+ethernet header (14) and batadv unicast header (10)) to fit in a 1280 bytes
+large MTU of the underlying link (max. 1294 byte frames). This would create
+a 1294 bytes large frame (fragment 2) and a 55 bytes large frame
+(fragment 1). The extra 54 bytes are the fragment header (20) added to each
+fragment and the external ethernet header (14) for the second fragment.
+
+Let us assume that the next hop is then not able to transport 1294 bytes to
+its next hop. The 1294 byte large frame will be dropped but the 55 bytes
+large fragment will still be forwarded to its destination.
+
+Or let us assume that the underlying hardware requires that each frame has
+a minimum size (e.g. 60 bytes). Then it will pad the 55 bytes frame to 60
+bytes. The receiver of the 60 bytes frame will no longer be able to
+correctly assemble the two frames together because it is not aware that 5
+bytes of the 60 bytes frame are padding and don't belong to the reassembled
+frame.
+
+This can partly be avoided by splitting frames more equally. In this
+example, the 675 and 674 bytes large fragment frames could both potentially
+reach its destination without being too large or too small.
+
+Reported-by: Martin Weinelt <martin@darmstadt.freifunk.net>
+Fixes: db56e4ecf5c2 ("batman-adv: Fragment and send skbs larger than mtu")
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Acked-by: Linus Lüssing <linus.luessing@c0d3.blue>
+---
+ net/batman-adv/fragmentation.c | 20 +++++++++++++-------
+ 1 file changed, 13 insertions(+), 7 deletions(-)
+
+diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
+index 11a23fd6..8f964bea 100644
+--- a/net/batman-adv/fragmentation.c
++++ b/net/batman-adv/fragmentation.c
+@@ -404,7 +404,7 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
+ * batadv_frag_create - create a fragment from skb
+ * @skb: skb to create fragment from
+ * @frag_head: header to use in new fragment
+- * @mtu: size of new fragment
++ * @fragment_size: size of new fragment
+ *
+ * Split the passed skb into two fragments: A new one with size matching the
+ * passed mtu and the old one with the rest. The new skb contains data from the
+@@ -414,11 +414,11 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
+ */
+ static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
+ struct batadv_frag_packet *frag_head,
+- unsigned int mtu)
++ unsigned int fragment_size)
+ {
+ struct sk_buff *skb_fragment;
+ unsigned int header_size = sizeof(*frag_head);
+- unsigned int fragment_size = mtu - header_size;
++ unsigned int mtu = fragment_size + header_size;
+
+ skb_fragment = netdev_alloc_skb(NULL, mtu + ETH_HLEN);
+ if (!skb_fragment)
+@@ -456,7 +456,7 @@ int batadv_frag_send_packet(struct sk_buff *skb,
+ struct sk_buff *skb_fragment;
+ unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
+ unsigned int header_size = sizeof(frag_header);
+- unsigned int max_fragment_size, max_packet_size;
++ unsigned int max_fragment_size, num_fragments;
+ int ret;
+
+ /* To avoid merge and refragmentation at next-hops we never send
+@@ -464,10 +464,15 @@ int batadv_frag_send_packet(struct sk_buff *skb,
+ */
+ mtu = min_t(unsigned int, mtu, BATADV_FRAG_MAX_FRAG_SIZE);
+ max_fragment_size = mtu - header_size;
+- max_packet_size = max_fragment_size * BATADV_FRAG_MAX_FRAGMENTS;
++
++ if (skb->len == 0 || max_fragment_size == 0)
++ return -EINVAL;
++
++ num_fragments = (skb->len - 1) / max_fragment_size + 1;
++ max_fragment_size = (skb->len - 1) / num_fragments + 1;
+
+ /* Don't even try to fragment, if we need more than 16 fragments */
+- if (skb->len > max_packet_size) {
++ if (num_fragments > BATADV_FRAG_MAX_FRAGMENTS) {
+ ret = -EAGAIN;
+ goto free_skb;
+ }
+@@ -507,7 +512,8 @@ int batadv_frag_send_packet(struct sk_buff *skb,
+ goto put_primary_if;
+ }
+
+- skb_fragment = batadv_frag_create(skb, &frag_header, mtu);
++ skb_fragment = batadv_frag_create(skb, &frag_header,
++ max_fragment_size);
+ if (!skb_fragment) {
+ ret = -ENOMEM;
+ goto put_primary_if;
--- /dev/null
+From: Sven Eckelmann <sven@narfation.org>
+Date: Sat, 4 Mar 2017 15:48:50 +0100
+Subject: [PATCH] batman-adv: Initialize gw sel_class via batadv_algo
+
+The gateway selection class variable is shared between different algorithm
+versions. But the interpretation of the content is algorithm specific. The
+initialization is therefore also algorithm specific.
+
+But this was implemented incorrectly and the initialization for BATMAN_V
+always overwrote the value previously written for BATMAN_IV. This could
+only be avoided when BATMAN_V was disabled during compile time.
+
+Using a special batadv_algo hook for this initialization avoids this
+problem.
+
+Fixes: 80b2d47be2c7 ("batman-adv: B.A.T.M.A.N. V - implement GW selection logic")
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+---
+ net/batman-adv/bat_iv_ogm.c | 11 +++++++++++
+ net/batman-adv/bat_v.c | 14 +++++++++++---
+ net/batman-adv/gateway_common.c | 5 +++++
+ net/batman-adv/soft-interface.c | 1 -
+ net/batman-adv/types.h | 2 ++
+ 5 files changed, 29 insertions(+), 4 deletions(-)
+
+diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
+index 7c3d994e..71343d0f 100644
+--- a/net/batman-adv/bat_iv_ogm.c
++++ b/net/batman-adv/bat_iv_ogm.c
+@@ -2477,6 +2477,16 @@ static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface)
+ batadv_iv_ogm_schedule(hard_iface);
+ }
+
++/**
++ * batadv_iv_init_sel_class - initialize GW selection class
++ * @bat_priv: the bat priv with all the soft interface information
++ */
++static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv)
++{
++ /* set default TQ difference threshold to 20 */
++ atomic_set(&bat_priv->gw.sel_class, 20);
++}
++
+ static struct batadv_gw_node *
+ batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
+ {
+@@ -2823,6 +2833,7 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
+ .del_if = batadv_iv_ogm_orig_del_if,
+ },
+ .gw = {
++ .init_sel_class = batadv_iv_init_sel_class,
+ .get_best_gw_node = batadv_iv_gw_get_best_gw_node,
+ .is_eligible = batadv_iv_gw_is_eligible,
+ #ifdef CONFIG_BATMAN_ADV_DEBUGFS
+diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
+index 0acd081d..a36c8e72 100644
+--- a/net/batman-adv/bat_v.c
++++ b/net/batman-adv/bat_v.c
+@@ -668,6 +668,16 @@ static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
+ return ret;
+ }
+
++/**
++ * batadv_v_init_sel_class - initialize GW selection class
++ * @bat_priv: the bat priv with all the soft interface information
++ */
++static void batadv_v_init_sel_class(struct batadv_priv *bat_priv)
++{
++ /* set default throughput difference threshold to 5Mbps */
++ 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)
+ {
+@@ -1052,6 +1062,7 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = {
+ .dump = batadv_v_orig_dump,
+ },
+ .gw = {
++ .init_sel_class = batadv_v_init_sel_class,
+ .store_sel_class = batadv_v_store_sel_class,
+ .show_sel_class = batadv_v_show_sel_class,
+ .get_best_gw_node = batadv_v_gw_get_best_gw_node,
+@@ -1092,9 +1103,6 @@ int batadv_v_mesh_init(struct batadv_priv *bat_priv)
+ if (ret < 0)
+ return ret;
+
+- /* set default throughput difference threshold to 5Mbps */
+- atomic_set(&bat_priv->gw.sel_class, 50);
+-
+ return 0;
+ }
+
+diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c
+index 5db2e43e..33940c5c 100644
+--- a/net/batman-adv/gateway_common.c
++++ b/net/batman-adv/gateway_common.c
+@@ -253,6 +253,11 @@ static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
+ */
+ void batadv_gw_init(struct batadv_priv *bat_priv)
+ {
++ if (bat_priv->algo_ops->gw.init_sel_class)
++ bat_priv->algo_ops->gw.init_sel_class(bat_priv);
++ else
++ atomic_set(&bat_priv->gw.sel_class, 1);
++
+ batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
+ NULL, BATADV_TVLV_GW, 1,
+ BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
+diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
+index 5d099b2e..d042c99a 100644
+--- a/net/batman-adv/soft-interface.c
++++ b/net/batman-adv/soft-interface.c
+@@ -819,7 +819,6 @@ static int batadv_softif_init_late(struct net_device *dev)
+ atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
+ #endif
+ atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF);
+- atomic_set(&bat_priv->gw.sel_class, 20);
+ atomic_set(&bat_priv->gw.bandwidth_down, 100);
+ atomic_set(&bat_priv->gw.bandwidth_up, 20);
+ atomic_set(&bat_priv->orig_interval, 1000);
+diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
+index 66b25e41..246f21b4 100644
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -1489,6 +1489,7 @@ struct batadv_algo_orig_ops {
+
+ /**
+ * struct batadv_algo_gw_ops - mesh algorithm callbacks (GW specific)
++ * @init_sel_class: initialize GW selection class (optional)
+ * @store_sel_class: parse and stores a new GW selection class (optional)
+ * @show_sel_class: prints the current GW selection class (optional)
+ * @get_best_gw_node: select the best GW from the list of available nodes
+@@ -1499,6 +1500,7 @@ struct batadv_algo_orig_ops {
+ * @dump: dump gateways to a netlink socket (optional)
+ */
+ struct batadv_algo_gw_ops {
++ void (*init_sel_class)(struct batadv_priv *bat_priv);
+ ssize_t (*store_sel_class)(struct batadv_priv *bat_priv, char *buff,
+ size_t count);
+ ssize_t (*show_sel_class)(struct batadv_priv *bat_priv, char *buff);
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